* [GIT PULL 01/36] KVM: arm/arm64: vgic: vgic_init returns -ENODEV when no online vcpu
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 02/36] KVM: arm/arm64: vgic: add init entry to VGIC KVM device Christoffer Dall
` (34 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Eric Auger <eric.auger@linaro.org>
To be more explicit on vgic initialization failure, -ENODEV is
returned by vgic_init when no online vcpus can be found at init.
Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
virt/kvm/arm/vgic.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 03affc7..b8d57e8 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1809,7 +1809,7 @@ static int vgic_init(struct kvm *kvm)
nr_cpus = dist->nr_cpus = atomic_read(&kvm->online_vcpus);
if (!nr_cpus) /* No vcpus? Can't be good... */
- return -EINVAL;
+ return -ENODEV;
/*
* If nobody configured the number of interrupts, use the
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 02/36] KVM: arm/arm64: vgic: add init entry to VGIC KVM device
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 01/36] KVM: arm/arm64: vgic: vgic_init returns -ENODEV when no online vcpu Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler Christoffer Dall
` (33 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Eric Auger <eric.auger@linaro.org>
Since the advent of VGIC dynamic initialization, this latter is
initialized quite late on the first vcpu run or "on-demand", when
injecting an IRQ or when the guest sets its registers.
This initialization could be initiated explicitly much earlier
by the users-space, as soon as it has provided the requested
dimensioning parameters.
This patch adds a new entry to the VGIC KVM device that allows
the user to manually request the VGIC init:
- a new KVM_DEV_ARM_VGIC_GRP_CTRL group is introduced.
- Its first attribute is KVM_DEV_ARM_VGIC_CTRL_INIT
The rationale behind introducing a group is to be able to add other
controls later on, if needed.
Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
Documentation/virtual/kvm/devices/arm-vgic.txt | 11 +++++++++++
arch/arm/include/uapi/asm/kvm.h | 2 ++
arch/arm64/include/uapi/asm/kvm.h | 2 ++
virt/kvm/arm/vgic.c | 14 +++++++++++++-
4 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt
index df8b0c7..30f5427 100644
--- a/Documentation/virtual/kvm/devices/arm-vgic.txt
+++ b/Documentation/virtual/kvm/devices/arm-vgic.txt
@@ -81,3 +81,14 @@ Groups:
-EINVAL: Value set is out of the expected range
-EBUSY: Value has already be set, or GIC has already been initialized
with default values.
+
+ KVM_DEV_ARM_VGIC_GRP_CTRL
+ Attributes:
+ KVM_DEV_ARM_VGIC_CTRL_INIT
+ request the initialization of the VGIC, no additional parameter in
+ kvm_device_attr.addr.
+ Errors:
+ -ENXIO: VGIC not properly configured as required prior to calling
+ this attribute
+ -ENODEV: no online VCPU
+ -ENOMEM: memory shortage when allocating vgic internal data
diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
index 09ee408..0db25bc 100644
--- a/arch/arm/include/uapi/asm/kvm.h
+++ b/arch/arm/include/uapi/asm/kvm.h
@@ -175,6 +175,8 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_OFFSET_SHIFT 0
#define KVM_DEV_ARM_VGIC_OFFSET_MASK (0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT)
#define KVM_DEV_ARM_VGIC_GRP_NR_IRQS 3
+#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
+#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_TYPE_SHIFT 24
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 8e38878..480af34 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -161,6 +161,8 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_OFFSET_SHIFT 0
#define KVM_DEV_ARM_VGIC_OFFSET_MASK (0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT)
#define KVM_DEV_ARM_VGIC_GRP_NR_IRQS 3
+#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
+#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_TYPE_SHIFT 24
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index b8d57e8..c84f53df 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -2302,7 +2302,14 @@ static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return ret;
}
-
+ case KVM_DEV_ARM_VGIC_GRP_CTRL: {
+ switch (attr->attr) {
+ case KVM_DEV_ARM_VGIC_CTRL_INIT:
+ r = vgic_init(dev->kvm);
+ return r;
+ }
+ break;
+ }
}
return -ENXIO;
@@ -2381,6 +2388,11 @@ static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return vgic_has_attr_regs(vgic_cpu_ranges, offset);
case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
return 0;
+ case KVM_DEV_ARM_VGIC_GRP_CTRL:
+ switch (attr->attr) {
+ case KVM_DEV_ARM_VGIC_CTRL_INIT:
+ return 0;
+ }
}
return -ENXIO;
}
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 01/36] KVM: arm/arm64: vgic: vgic_init returns -ENODEV when no online vcpu Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 02/36] KVM: arm/arm64: vgic: add init entry to VGIC KVM device Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 11:35 ` Mark Rutland
2015-01-23 10:02 ` [GIT PULL 04/36] ARM: KVM: extend WFI tracepoint to differentiate between wfi and wfe Christoffer Dall
` (32 subsequent siblings)
35 siblings, 1 reply; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Wei Huang <wei@redhat.com>
arm64 uses its own copy of exit handler (arm64/kvm/handle_exit.c).
Currently this file doesn't hook up with any trace points. As a result
users might not see certain events (e.g. HVC & WFI) while using ftrace
with arm64 KVM. This patch fixes this issue by adding a new trace file
and defining two trace events (one of which is shared by wfi and wfe)
for arm64. The new trace points are then linked with related functions
in handle_exit.c.
Signed-off-by: Wei Huang <wei@redhat.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm64/include/asm/kvm_arm.h | 2 ++
arch/arm64/include/asm/kvm_emulate.h | 5 ++++
arch/arm64/kvm/handle_exit.c | 13 +++++++--
arch/arm64/kvm/trace.h | 55 ++++++++++++++++++++++++++++++++++++
4 files changed, 73 insertions(+), 2 deletions(-)
create mode 100644 arch/arm64/kvm/trace.h
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 8afb863..3da2d3a 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -257,4 +257,6 @@
#define ESR_EL2_EC_WFI_ISS_WFE (1 << 0)
+#define ESR_EL2_HVC_IMM_MASK ((1UL << 16) - 1)
+
#endif /* __ARM64_KVM_ARM_H__ */
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 8127e45..a6fa2d2 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -126,6 +126,11 @@ static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
}
+static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
+{
+ return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_HVC_IMM_MASK;
+}
+
static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
{
return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_ISV);
diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index 34b8bd0..6a7eb3c 100644
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c
@@ -26,12 +26,18 @@
#include <asm/kvm_mmu.h>
#include <asm/kvm_psci.h>
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
int ret;
+ trace_kvm_hvc_arm64(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
+ kvm_vcpu_hvc_get_imm(vcpu));
+
ret = kvm_psci_call(vcpu);
if (ret < 0) {
kvm_inject_undefined(vcpu);
@@ -61,10 +67,13 @@ static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
*/
static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
- if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE)
+ if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE) {
+ trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
kvm_vcpu_on_spin(vcpu);
- else
+ } else {
+ trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
kvm_vcpu_block(vcpu);
+ }
kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h
new file mode 100644
index 0000000..157416e9
--- /dev/null
+++ b/arch/arm64/kvm/trace.h
@@ -0,0 +1,55 @@
+#if !defined(_TRACE_ARM64_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_ARM64_KVM_H
+
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm
+
+TRACE_EVENT(kvm_wfx_arm64,
+ TP_PROTO(unsigned long vcpu_pc, bool is_wfe),
+ TP_ARGS(vcpu_pc, is_wfe),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, vcpu_pc)
+ __field(bool, is_wfe)
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_pc = vcpu_pc;
+ __entry->is_wfe = is_wfe;
+ ),
+
+ TP_printk("guest executed wf%c at: 0x%08lx",
+ __entry->is_wfe ? 'e' : 'i', __entry->vcpu_pc)
+);
+
+TRACE_EVENT(kvm_hvc_arm64,
+ TP_PROTO(unsigned long vcpu_pc, unsigned long r0, unsigned long imm),
+ TP_ARGS(vcpu_pc, r0, imm),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, vcpu_pc)
+ __field(unsigned long, r0)
+ __field(unsigned long, imm)
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_pc = vcpu_pc;
+ __entry->r0 = r0;
+ __entry->imm = imm;
+ ),
+
+ TP_printk("HVC at 0x%08lx (r0: 0x%08lx, imm: 0x%lx)",
+ __entry->vcpu_pc, __entry->r0, __entry->imm)
+);
+
+#endif /* _TRACE_ARM64_KVM_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler
2015-01-23 10:02 ` [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler Christoffer Dall
@ 2015-01-23 11:35 ` Mark Rutland
2015-01-23 12:01 ` Paolo Bonzini
0 siblings, 1 reply; 42+ messages in thread
From: Mark Rutland @ 2015-01-23 11:35 UTC (permalink / raw)
To: linux-arm-kernel
Hi Christoffer,
On Fri, Jan 23, 2015 at 10:02:32AM +0000, Christoffer Dall wrote:
> From: Wei Huang <wei@redhat.com>
>
> arm64 uses its own copy of exit handler (arm64/kvm/handle_exit.c).
> Currently this file doesn't hook up with any trace points. As a result
> users might not see certain events (e.g. HVC & WFI) while using ftrace
> with arm64 KVM. This patch fixes this issue by adding a new trace file
> and defining two trace events (one of which is shared by wfi and wfe)
> for arm64. The new trace points are then linked with related functions
> in handle_exit.c.
Stephen Rothwell reported a couple of conflicts between this patch and
my ESR rework in -next:
https://lkml.org/lkml/2015/1/22/7
https://lkml.org/lkml/2015/1/22/8
I'd hoped we'd be able to fix that before this went further upstream.
The easiest way I could see to do that was to merge my esr branch (which
is stable and Catalin has pulled) branch into the kvm-arm tree, and fix
the conflicts there.
Is there any chance we can fix that now?
Thanks,
Mark.
>
> Signed-off-by: Wei Huang <wei@redhat.com>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
> ---
> arch/arm64/include/asm/kvm_arm.h | 2 ++
> arch/arm64/include/asm/kvm_emulate.h | 5 ++++
> arch/arm64/kvm/handle_exit.c | 13 +++++++--
> arch/arm64/kvm/trace.h | 55 ++++++++++++++++++++++++++++++++++++
> 4 files changed, 73 insertions(+), 2 deletions(-)
> create mode 100644 arch/arm64/kvm/trace.h
>
> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> index 8afb863..3da2d3a 100644
> --- a/arch/arm64/include/asm/kvm_arm.h
> +++ b/arch/arm64/include/asm/kvm_arm.h
> @@ -257,4 +257,6 @@
>
> #define ESR_EL2_EC_WFI_ISS_WFE (1 << 0)
>
> +#define ESR_EL2_HVC_IMM_MASK ((1UL << 16) - 1)
> +
> #endif /* __ARM64_KVM_ARM_H__ */
> diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
> index 8127e45..a6fa2d2 100644
> --- a/arch/arm64/include/asm/kvm_emulate.h
> +++ b/arch/arm64/include/asm/kvm_emulate.h
> @@ -126,6 +126,11 @@ static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
> return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
> }
>
> +static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
> +{
> + return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_HVC_IMM_MASK;
> +}
> +
> static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
> {
> return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_ISV);
> diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
> index 34b8bd0..6a7eb3c 100644
> --- a/arch/arm64/kvm/handle_exit.c
> +++ b/arch/arm64/kvm/handle_exit.c
> @@ -26,12 +26,18 @@
> #include <asm/kvm_mmu.h>
> #include <asm/kvm_psci.h>
>
> +#define CREATE_TRACE_POINTS
> +#include "trace.h"
> +
> typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
>
> static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
> {
> int ret;
>
> + trace_kvm_hvc_arm64(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
> + kvm_vcpu_hvc_get_imm(vcpu));
> +
> ret = kvm_psci_call(vcpu);
> if (ret < 0) {
> kvm_inject_undefined(vcpu);
> @@ -61,10 +67,13 @@ static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
> */
> static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
> {
> - if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE)
> + if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE) {
> + trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
> kvm_vcpu_on_spin(vcpu);
> - else
> + } else {
> + trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
> kvm_vcpu_block(vcpu);
> + }
>
> kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
>
> diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h
> new file mode 100644
> index 0000000..157416e9
> --- /dev/null
> +++ b/arch/arm64/kvm/trace.h
> @@ -0,0 +1,55 @@
> +#if !defined(_TRACE_ARM64_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_ARM64_KVM_H
> +
> +#include <linux/tracepoint.h>
> +
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM kvm
> +
> +TRACE_EVENT(kvm_wfx_arm64,
> + TP_PROTO(unsigned long vcpu_pc, bool is_wfe),
> + TP_ARGS(vcpu_pc, is_wfe),
> +
> + TP_STRUCT__entry(
> + __field(unsigned long, vcpu_pc)
> + __field(bool, is_wfe)
> + ),
> +
> + TP_fast_assign(
> + __entry->vcpu_pc = vcpu_pc;
> + __entry->is_wfe = is_wfe;
> + ),
> +
> + TP_printk("guest executed wf%c at: 0x%08lx",
> + __entry->is_wfe ? 'e' : 'i', __entry->vcpu_pc)
> +);
> +
> +TRACE_EVENT(kvm_hvc_arm64,
> + TP_PROTO(unsigned long vcpu_pc, unsigned long r0, unsigned long imm),
> + TP_ARGS(vcpu_pc, r0, imm),
> +
> + TP_STRUCT__entry(
> + __field(unsigned long, vcpu_pc)
> + __field(unsigned long, r0)
> + __field(unsigned long, imm)
> + ),
> +
> + TP_fast_assign(
> + __entry->vcpu_pc = vcpu_pc;
> + __entry->r0 = r0;
> + __entry->imm = imm;
> + ),
> +
> + TP_printk("HVC at 0x%08lx (r0: 0x%08lx, imm: 0x%lx)",
> + __entry->vcpu_pc, __entry->r0, __entry->imm)
> +);
> +
> +#endif /* _TRACE_ARM64_KVM_H */
> +
> +#undef TRACE_INCLUDE_PATH
> +#define TRACE_INCLUDE_PATH .
> +#undef TRACE_INCLUDE_FILE
> +#define TRACE_INCLUDE_FILE trace
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
> --
> 2.1.2.330.g565301e.dirty
>
> _______________________________________________
> kvmarm mailing list
> kvmarm at lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
>
^ permalink raw reply [flat|nested] 42+ messages in thread* [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler
2015-01-23 11:35 ` Mark Rutland
@ 2015-01-23 12:01 ` Paolo Bonzini
2015-01-23 12:49 ` Paolo Bonzini
0 siblings, 1 reply; 42+ messages in thread
From: Paolo Bonzini @ 2015-01-23 12:01 UTC (permalink / raw)
To: linux-arm-kernel
On 23/01/2015 12:35, Mark Rutland wrote:
>
> https://lkml.org/lkml/2015/1/22/7
> https://lkml.org/lkml/2015/1/22/8
>
> I'd hoped we'd be able to fix that before this went further upstream.
>
> The easiest way I could see to do that was to merge my esr branch (which
> is stable and Catalin has pulled) branch into the kvm-arm tree, and fix
> the conflicts there.
>
> Is there any chance we can fix that now?
I'll fix the conflicts in the kvm tree. Please wait for further
instructions...
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler
2015-01-23 12:01 ` Paolo Bonzini
@ 2015-01-23 12:49 ` Paolo Bonzini
2015-01-23 12:55 ` Christoffer Dall
2015-01-23 13:41 ` Mark Rutland
0 siblings, 2 replies; 42+ messages in thread
From: Paolo Bonzini @ 2015-01-23 12:49 UTC (permalink / raw)
To: linux-arm-kernel
On 23/01/2015 13:01, Paolo Bonzini wrote:
>
>
> On 23/01/2015 12:35, Mark Rutland wrote:
>>
>> https://lkml.org/lkml/2015/1/22/7
>> https://lkml.org/lkml/2015/1/22/8
>>
>> I'd hoped we'd be able to fix that before this went further upstream.
>>
>> The easiest way I could see to do that was to merge my esr branch (which
>> is stable and Catalin has pulled) branch into the kvm-arm tree, and fix
>> the conflicts there.
>>
>> Is there any chance we can fix that now?
>
> I'll fix the conflicts in the kvm tree. Please wait for further
> instructions...
Ok folks, please check that the resolution in the queue branch of
git://git.kernel.org/pub/scm/virt/kvm/kvm.git is okay.
Paolo
^ permalink raw reply [flat|nested] 42+ messages in thread
* [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler
2015-01-23 12:49 ` Paolo Bonzini
@ 2015-01-23 12:55 ` Christoffer Dall
2015-01-23 13:41 ` Mark Rutland
1 sibling, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 12:55 UTC (permalink / raw)
To: linux-arm-kernel
On Fri, Jan 23, 2015 at 01:49:41PM +0100, Paolo Bonzini wrote:
>
>
> On 23/01/2015 13:01, Paolo Bonzini wrote:
> >
> >
> > On 23/01/2015 12:35, Mark Rutland wrote:
> >>
> >> https://lkml.org/lkml/2015/1/22/7
> >> https://lkml.org/lkml/2015/1/22/8
> >>
> >> I'd hoped we'd be able to fix that before this went further upstream.
> >>
> >> The easiest way I could see to do that was to merge my esr branch (which
> >> is stable and Catalin has pulled) branch into the kvm-arm tree, and fix
> >> the conflicts there.
> >>
> >> Is there any chance we can fix that now?
> >
> > I'll fix the conflicts in the kvm tree. Please wait for further
> > instructions...
>
> Ok folks, please check that the resolution in the queue branch of
> git://git.kernel.org/pub/scm/virt/kvm/kvm.git is okay.
>
Looks great, I gave a quick spin on Juno and no problems, thanks Paolo!
-Christoffer
^ permalink raw reply [flat|nested] 42+ messages in thread
* [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler
2015-01-23 12:49 ` Paolo Bonzini
2015-01-23 12:55 ` Christoffer Dall
@ 2015-01-23 13:41 ` Mark Rutland
1 sibling, 0 replies; 42+ messages in thread
From: Mark Rutland @ 2015-01-23 13:41 UTC (permalink / raw)
To: linux-arm-kernel
On Fri, Jan 23, 2015 at 12:49:41PM +0000, Paolo Bonzini wrote:
>
>
> On 23/01/2015 13:01, Paolo Bonzini wrote:
> >
> >
> > On 23/01/2015 12:35, Mark Rutland wrote:
> >>
> >> https://lkml.org/lkml/2015/1/22/7
> >> https://lkml.org/lkml/2015/1/22/8
> >>
> >> I'd hoped we'd be able to fix that before this went further upstream.
> >>
> >> The easiest way I could see to do that was to merge my esr branch (which
> >> is stable and Catalin has pulled) branch into the kvm-arm tree, and fix
> >> the conflicts there.
> >>
> >> Is there any chance we can fix that now?
> >
> > I'll fix the conflicts in the kvm tree. Please wait for further
> > instructions...
>
> Ok folks, please check that the resolution in the queue branch of
> git://git.kernel.org/pub/scm/virt/kvm/kvm.git is okay.
That looks fine to me. Git was happy to merge the arm64 for-next/core
branch, and the result boots fine on my Juno.
Thanks for handling the fixup!
Mark.
^ permalink raw reply [flat|nested] 42+ messages in thread
* [GIT PULL 04/36] ARM: KVM: extend WFI tracepoint to differentiate between wfi and wfe
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (2 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 03/36] arm/arm64: KVM: add tracing support for arm64 exit handler Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 05/36] KVM: Add architecture-defined TLB flush support Christoffer Dall
` (31 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
Currently the trace printk talks about "wfi" only, though the trace
point triggers both on wfi and wfe traps.
Add a parameter to differentiate between the two.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Wei Huang <wei@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm/kvm/handle_exit.c | 8 +++++---
arch/arm/kvm/trace.h | 11 +++++++----
2 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index a96a804..95f12b2 100644
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -87,11 +87,13 @@ static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
*/
static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
- trace_kvm_wfi(*vcpu_pc(vcpu));
- if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE)
+ if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE) {
+ trace_kvm_wfx(*vcpu_pc(vcpu), true);
kvm_vcpu_on_spin(vcpu);
- else
+ } else {
+ trace_kvm_wfx(*vcpu_pc(vcpu), false);
kvm_vcpu_block(vcpu);
+ }
kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
diff --git a/arch/arm/kvm/trace.h b/arch/arm/kvm/trace.h
index b1d640f..f741449 100644
--- a/arch/arm/kvm/trace.h
+++ b/arch/arm/kvm/trace.h
@@ -140,19 +140,22 @@ TRACE_EVENT(kvm_emulate_cp15_imp,
__entry->CRm, __entry->Op2)
);
-TRACE_EVENT(kvm_wfi,
- TP_PROTO(unsigned long vcpu_pc),
- TP_ARGS(vcpu_pc),
+TRACE_EVENT(kvm_wfx,
+ TP_PROTO(unsigned long vcpu_pc, bool is_wfe),
+ TP_ARGS(vcpu_pc, is_wfe),
TP_STRUCT__entry(
__field( unsigned long, vcpu_pc )
+ __field( bool, is_wfe )
),
TP_fast_assign(
__entry->vcpu_pc = vcpu_pc;
+ __entry->is_wfe = is_wfe;
),
- TP_printk("guest executed wfi at: 0x%08lx", __entry->vcpu_pc)
+ TP_printk("guest executed wf%c at: 0x%08lx",
+ __entry->is_wfe ? 'e' : 'i', __entry->vcpu_pc)
);
TRACE_EVENT(kvm_unmap_hva,
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 05/36] KVM: Add architecture-defined TLB flush support
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (3 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 04/36] ARM: KVM: extend WFI tracepoint to differentiate between wfi and wfe Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 06/36] KVM: Add generic support for dirty page logging Christoffer Dall
` (30 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
Allow architectures to override the generic kvm_flush_remote_tlbs()
function via HAVE_KVM_ARCH_TLB_FLUSH_ALL. ARMv7 will need this to
provide its own TLB flush interface.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
virt/kvm/Kconfig | 3 +++
virt/kvm/kvm_main.c | 2 ++
2 files changed, 5 insertions(+)
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index fc0c5e6..3796a21 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -37,3 +37,6 @@ config HAVE_KVM_CPU_RELAX_INTERCEPT
config KVM_VFIO
bool
+
+config HAVE_KVM_ARCH_TLB_FLUSH_ALL
+ bool
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 167e8c1..d03bd22 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -176,6 +176,7 @@ bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
return called;
}
+#ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
void kvm_flush_remote_tlbs(struct kvm *kvm)
{
long dirty_count = kvm->tlbs_dirty;
@@ -186,6 +187,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
}
EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
+#endif
void kvm_reload_remote_mmus(struct kvm *kvm)
{
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 06/36] KVM: Add generic support for dirty page logging
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (4 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 05/36] KVM: Add architecture-defined TLB flush support Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 07/36] KVM: x86: switch to kvm_get_dirty_log_protect Christoffer Dall
` (29 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
kvm_get_dirty_log() provides generic handling of dirty bitmap, currently reused
by several architectures. Building on that we intrdoduce
kvm_get_dirty_log_protect() adding write protection to mark these pages dirty
for future write access, before next KVM_GET_DIRTY_LOG ioctl call from user
space.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
include/linux/kvm_host.h | 9 ++++++
virt/kvm/Kconfig | 6 ++++
virt/kvm/kvm_main.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 95 insertions(+)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 26f1060..3b934cc 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -611,6 +611,15 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
int kvm_get_dirty_log(struct kvm *kvm,
struct kvm_dirty_log *log, int *is_dirty);
+
+int kvm_get_dirty_log_protect(struct kvm *kvm,
+ struct kvm_dirty_log *log, bool *is_dirty);
+
+void kvm_arch_mmu_write_protect_pt_masked(struct kvm *kvm,
+ struct kvm_memory_slot *slot,
+ gfn_t gfn_offset,
+ unsigned long mask);
+
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
struct kvm_dirty_log *log);
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 3796a21..314950c 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -40,3 +40,9 @@ config KVM_VFIO
config HAVE_KVM_ARCH_TLB_FLUSH_ALL
bool
+
+config HAVE_KVM_ARCH_DIRTY_LOG_PROTECT
+ bool
+
+config KVM_GENERIC_DIRTYLOG_READ_PROTECT
+ bool
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d03bd22..246cf29 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -995,6 +995,86 @@ out:
}
EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
+#ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
+/**
+ * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
+ * are dirty write protect them for next write.
+ * @kvm: pointer to kvm instance
+ * @log: slot id and address to which we copy the log
+ * @is_dirty: flag set if any page is dirty
+ *
+ * We need to keep it in mind that VCPU threads can write to the bitmap
+ * concurrently. So, to avoid losing track of dirty pages we keep the
+ * following order:
+ *
+ * 1. Take a snapshot of the bit and clear it if needed.
+ * 2. Write protect the corresponding page.
+ * 3. Copy the snapshot to the userspace.
+ * 4. Upon return caller flushes TLB's if needed.
+ *
+ * Between 2 and 4, the guest may write to the page using the remaining TLB
+ * entry. This is not a problem because the page is reported dirty using
+ * the snapshot taken before and step 4 ensures that writes done after
+ * exiting to userspace will be logged for the next call.
+ *
+ */
+int kvm_get_dirty_log_protect(struct kvm *kvm,
+ struct kvm_dirty_log *log, bool *is_dirty)
+{
+ struct kvm_memory_slot *memslot;
+ int r, i;
+ unsigned long n;
+ unsigned long *dirty_bitmap;
+ unsigned long *dirty_bitmap_buffer;
+
+ r = -EINVAL;
+ if (log->slot >= KVM_USER_MEM_SLOTS)
+ goto out;
+
+ memslot = id_to_memslot(kvm->memslots, log->slot);
+
+ dirty_bitmap = memslot->dirty_bitmap;
+ r = -ENOENT;
+ if (!dirty_bitmap)
+ goto out;
+
+ n = kvm_dirty_bitmap_bytes(memslot);
+
+ dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
+ memset(dirty_bitmap_buffer, 0, n);
+
+ spin_lock(&kvm->mmu_lock);
+ *is_dirty = false;
+ for (i = 0; i < n / sizeof(long); i++) {
+ unsigned long mask;
+ gfn_t offset;
+
+ if (!dirty_bitmap[i])
+ continue;
+
+ *is_dirty = true;
+
+ mask = xchg(&dirty_bitmap[i], 0);
+ dirty_bitmap_buffer[i] = mask;
+
+ offset = i * BITS_PER_LONG;
+ kvm_arch_mmu_write_protect_pt_masked(kvm, memslot, offset,
+ mask);
+ }
+
+ spin_unlock(&kvm->mmu_lock);
+
+ r = -EFAULT;
+ if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
+ goto out;
+
+ r = 0;
+out:
+ return r;
+}
+EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
+#endif
+
bool kvm_largepages_enabled(void)
{
return largepages_enabled;
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 07/36] KVM: x86: switch to kvm_get_dirty_log_protect
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (5 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 06/36] KVM: Add generic support for dirty page logging Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 08/36] KVM: arm: Add ARMv7 API to flush TLBs Christoffer Dall
` (28 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Paolo Bonzini <pbonzini@redhat.com>
We now have a generic function that does most of the work of
kvm_vm_ioctl_get_dirty_log, now use it.
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
arch/x86/include/asm/kvm_host.h | 3 --
arch/x86/kvm/Kconfig | 1 +
arch/x86/kvm/mmu.c | 4 +--
arch/x86/kvm/x86.c | 72 ++++++++---------------------------------
4 files changed, 16 insertions(+), 64 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index cb19d05..3ceddf4 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -821,9 +821,6 @@ void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
void kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
-void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
- struct kvm_memory_slot *slot,
- gfn_t gfn_offset, unsigned long mask);
void kvm_mmu_zap_all(struct kvm *kvm);
void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm);
unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index f9d16ff..d073594 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -39,6 +39,7 @@ config KVM
select PERF_EVENTS
select HAVE_KVM_MSI
select HAVE_KVM_CPU_RELAX_INTERCEPT
+ select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_VFIO
---help---
Support hosting fully virtualized guest machines using hardware
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index a0985eb..3aa46aa 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1203,7 +1203,7 @@ static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp,
}
/**
- * kvm_mmu_write_protect_pt_masked - write protect selected PT level pages
+ * kvm_arch_mmu_write_protect_pt_masked - write protect selected PT level pages
* @kvm: kvm instance
* @slot: slot to protect
* @gfn_offset: start of the BITS_PER_LONG pages we care about
@@ -1212,7 +1212,7 @@ static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp,
* Used when we do not need to care about huge page mappings: e.g. during dirty
* logging we do not have any such mappings.
*/
-void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
+void kvm_arch_mmu_write_protect_pt_masked(struct kvm *kvm,
struct kvm_memory_slot *slot,
gfn_t gfn_offset, unsigned long mask)
{
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 49ecda7..556dfb4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3748,83 +3748,37 @@ static int kvm_vm_ioctl_reinject(struct kvm *kvm,
* @kvm: kvm instance
* @log: slot id and address to which we copy the log
*
- * We need to keep it in mind that VCPU threads can write to the bitmap
- * concurrently. So, to avoid losing data, we keep the following order for
- * each bit:
+ * Steps 1-4 below provide general overview of dirty page logging. See
+ * kvm_get_dirty_log_protect() function description for additional details.
+ *
+ * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
+ * always flush the TLB (step 4) even if previous step failed and the dirty
+ * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
+ * does not preclude user space subsequent dirty log read. Flushing TLB ensures
+ * writes will be marked dirty for next log read.
*
* 1. Take a snapshot of the bit and clear it if needed.
* 2. Write protect the corresponding page.
- * 3. Flush TLB's if needed.
- * 4. Copy the snapshot to the userspace.
- *
- * Between 2 and 3, the guest may write to the page using the remaining TLB
- * entry. This is not a problem because the page will be reported dirty at
- * step 4 using the snapshot taken before and step 3 ensures that successive
- * writes will be logged for the next call.
+ * 3. Copy the snapshot to the userspace.
+ * 4. Flush TLB's if needed.
*/
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
- int r;
- struct kvm_memory_slot *memslot;
- unsigned long n, i;
- unsigned long *dirty_bitmap;
- unsigned long *dirty_bitmap_buffer;
bool is_dirty = false;
+ int r;
mutex_lock(&kvm->slots_lock);
- r = -EINVAL;
- if (log->slot >= KVM_USER_MEM_SLOTS)
- goto out;
-
- memslot = id_to_memslot(kvm->memslots, log->slot);
-
- dirty_bitmap = memslot->dirty_bitmap;
- r = -ENOENT;
- if (!dirty_bitmap)
- goto out;
-
- n = kvm_dirty_bitmap_bytes(memslot);
-
- dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
- memset(dirty_bitmap_buffer, 0, n);
-
- spin_lock(&kvm->mmu_lock);
-
- for (i = 0; i < n / sizeof(long); i++) {
- unsigned long mask;
- gfn_t offset;
-
- if (!dirty_bitmap[i])
- continue;
-
- is_dirty = true;
-
- mask = xchg(&dirty_bitmap[i], 0);
- dirty_bitmap_buffer[i] = mask;
-
- offset = i * BITS_PER_LONG;
- kvm_mmu_write_protect_pt_masked(kvm, memslot, offset, mask);
- }
-
- spin_unlock(&kvm->mmu_lock);
-
- /* See the comments in kvm_mmu_slot_remove_write_access(). */
- lockdep_assert_held(&kvm->slots_lock);
+ r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
/*
* All the TLBs can be flushed out of mmu lock, see the comments in
* kvm_mmu_slot_remove_write_access().
*/
+ lockdep_assert_held(&kvm->slots_lock);
if (is_dirty)
kvm_flush_remote_tlbs(kvm);
- r = -EFAULT;
- if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
- goto out;
-
- r = 0;
-out:
mutex_unlock(&kvm->slots_lock);
return r;
}
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 08/36] KVM: arm: Add ARMv7 API to flush TLBs
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (6 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 07/36] KVM: x86: switch to kvm_get_dirty_log_protect Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 09/36] KVM: arm: Add initial dirty page locking support Christoffer Dall
` (27 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
This patch adds ARMv7 architecture TLB Flush function.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
arch/arm/include/asm/kvm_asm.h | 1 +
arch/arm/include/asm/kvm_host.h | 12 ++++++++++++
arch/arm/kvm/Kconfig | 1 +
arch/arm/kvm/interrupts.S | 11 +++++++++++
4 files changed, 25 insertions(+)
diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h
index 3a67bec..25410b2 100644
--- a/arch/arm/include/asm/kvm_asm.h
+++ b/arch/arm/include/asm/kvm_asm.h
@@ -96,6 +96,7 @@ extern char __kvm_hyp_code_end[];
extern void __kvm_flush_vm_context(void);
extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
+extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
#endif
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 254e065..acfced3 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -221,6 +221,18 @@ static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
}
+/**
+ * kvm_flush_remote_tlbs() - flush all VM TLB entries
+ * @kvm: pointer to kvm structure.
+ *
+ * Interface to HYP function to flush all VM TLB entries without address
+ * parameter.
+ */
+static inline void kvm_flush_remote_tlbs(struct kvm *kvm)
+{
+ kvm_call_hyp(__kvm_tlb_flush_vmid, kvm);
+}
+
static inline int kvm_arch_dev_ioctl_check_extension(long ext)
{
return 0;
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index 466bd29..f27f336 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -21,6 +21,7 @@ config KVM
select PREEMPT_NOTIFIERS
select ANON_INODES
select HAVE_KVM_CPU_RELAX_INTERCEPT
+ select HAVE_KVM_ARCH_TLB_FLUSH_ALL
select KVM_MMIO
select KVM_ARM_HOST
depends on ARM_VIRT_EXT && ARM_LPAE
diff --git a/arch/arm/kvm/interrupts.S b/arch/arm/kvm/interrupts.S
index 01dcb0e..79caf79 100644
--- a/arch/arm/kvm/interrupts.S
+++ b/arch/arm/kvm/interrupts.S
@@ -66,6 +66,17 @@ ENTRY(__kvm_tlb_flush_vmid_ipa)
bx lr
ENDPROC(__kvm_tlb_flush_vmid_ipa)
+/**
+ * void __kvm_tlb_flush_vmid(struct kvm *kvm) - Flush per-VMID TLBs
+ *
+ * Reuses __kvm_tlb_flush_vmid_ipa() for ARMv7, without passing address
+ * parameter
+ */
+
+ENTRY(__kvm_tlb_flush_vmid)
+ b __kvm_tlb_flush_vmid_ipa
+ENDPROC(__kvm_tlb_flush_vmid)
+
/********************************************************************
* Flush TLBs and instruction caches of all CPUs inside the inner-shareable
* domain, for all VMIDs
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 09/36] KVM: arm: Add initial dirty page locking support
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (7 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 08/36] KVM: arm: Add ARMv7 API to flush TLBs Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 10/36] KVM: arm: dirty logging write protect support Christoffer Dall
` (26 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
Add support for initial write protection of VM memslots. This patch
series assumes that huge PUDs will not be used in 2nd stage tables, which is
always valid on ARMv7
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
arch/arm/include/asm/kvm_host.h | 2 +
arch/arm/include/asm/kvm_mmu.h | 21 ++++++
arch/arm/include/asm/pgtable-3level.h | 1 +
arch/arm/kvm/mmu.c | 135 ++++++++++++++++++++++++++++++++++
4 files changed, 159 insertions(+)
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index acfced3..38931d4 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -246,6 +246,8 @@ static inline void vgic_arch_setup(const struct vgic_params *vgic)
int kvm_perf_init(void);
int kvm_perf_teardown(void);
+void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
+
static inline void kvm_arch_hardware_disable(void) {}
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index 63e0ecc..2672cf8 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -114,6 +114,27 @@ static inline void kvm_set_s2pmd_writable(pmd_t *pmd)
pmd_val(*pmd) |= L_PMD_S2_RDWR;
}
+static inline void kvm_set_s2pte_readonly(pte_t *pte)
+{
+ pte_val(*pte) = (pte_val(*pte) & ~L_PTE_S2_RDWR) | L_PTE_S2_RDONLY;
+}
+
+static inline bool kvm_s2pte_readonly(pte_t *pte)
+{
+ return (pte_val(*pte) & L_PTE_S2_RDWR) == L_PTE_S2_RDONLY;
+}
+
+static inline void kvm_set_s2pmd_readonly(pmd_t *pmd)
+{
+ pmd_val(*pmd) = (pmd_val(*pmd) & ~L_PMD_S2_RDWR) | L_PMD_S2_RDONLY;
+}
+
+static inline bool kvm_s2pmd_readonly(pmd_t *pmd)
+{
+ return (pmd_val(*pmd) & L_PMD_S2_RDWR) == L_PMD_S2_RDONLY;
+}
+
+
/* Open coded p*d_addr_end that can deal with 64bit addresses */
#define kvm_pgd_addr_end(addr, end) \
({ u64 __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index a31ecdad..ae1d30a1 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -130,6 +130,7 @@
#define L_PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[1] */
#define L_PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */
+#define L_PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[1] */
#define L_PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */
/*
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 1dc9778..c9e5f38 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -45,6 +45,7 @@ static phys_addr_t hyp_idmap_vector;
#define hyp_pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t))
#define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x))
+#define kvm_pud_huge(_x) pud_huge(_x)
static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
{
@@ -905,6 +906,131 @@ static bool kvm_is_device_pfn(unsigned long pfn)
return !pfn_valid(pfn);
}
+#ifdef CONFIG_ARM
+/**
+ * stage2_wp_ptes - write protect PMD range
+ * @pmd: pointer to pmd entry
+ * @addr: range start address
+ * @end: range end address
+ */
+static void stage2_wp_ptes(pmd_t *pmd, phys_addr_t addr, phys_addr_t end)
+{
+ pte_t *pte;
+
+ pte = pte_offset_kernel(pmd, addr);
+ do {
+ if (!pte_none(*pte)) {
+ if (!kvm_s2pte_readonly(pte))
+ kvm_set_s2pte_readonly(pte);
+ }
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+}
+
+/**
+ * stage2_wp_pmds - write protect PUD range
+ * @pud: pointer to pud entry
+ * @addr: range start address
+ * @end: range end address
+ */
+static void stage2_wp_pmds(pud_t *pud, phys_addr_t addr, phys_addr_t end)
+{
+ pmd_t *pmd;
+ phys_addr_t next;
+
+ pmd = pmd_offset(pud, addr);
+
+ do {
+ next = kvm_pmd_addr_end(addr, end);
+ if (!pmd_none(*pmd)) {
+ if (kvm_pmd_huge(*pmd)) {
+ if (!kvm_s2pmd_readonly(pmd))
+ kvm_set_s2pmd_readonly(pmd);
+ } else {
+ stage2_wp_ptes(pmd, addr, next);
+ }
+ }
+ } while (pmd++, addr = next, addr != end);
+}
+
+/**
+ * stage2_wp_puds - write protect PGD range
+ * @pgd: pointer to pgd entry
+ * @addr: range start address
+ * @end: range end address
+ *
+ * Process PUD entries, for a huge PUD we cause a panic.
+ */
+static void stage2_wp_puds(pgd_t *pgd, phys_addr_t addr, phys_addr_t end)
+{
+ pud_t *pud;
+ phys_addr_t next;
+
+ pud = pud_offset(pgd, addr);
+ do {
+ next = kvm_pud_addr_end(addr, end);
+ if (!pud_none(*pud)) {
+ /* TODO:PUD not supported, revisit later if supported */
+ BUG_ON(kvm_pud_huge(*pud));
+ stage2_wp_pmds(pud, addr, next);
+ }
+ } while (pud++, addr = next, addr != end);
+}
+
+/**
+ * stage2_wp_range() - write protect stage2 memory region range
+ * @kvm: The KVM pointer
+ * @addr: Start address of range
+ * @end: End address of range
+ */
+static void stage2_wp_range(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
+{
+ pgd_t *pgd;
+ phys_addr_t next;
+
+ pgd = kvm->arch.pgd + pgd_index(addr);
+ do {
+ /*
+ * Release kvm_mmu_lock periodically if the memory region is
+ * large. Otherwise, we may see kernel panics with
+ * CONFIG_DETECT_HUNG_TASK, CONFIG_LOCK_DETECTOR,
+ * CONFIG_LOCK_DEP. Additionally, holding the lock too long
+ * will also starve other vCPUs.
+ */
+ if (need_resched() || spin_needbreak(&kvm->mmu_lock))
+ cond_resched_lock(&kvm->mmu_lock);
+
+ next = kvm_pgd_addr_end(addr, end);
+ if (pgd_present(*pgd))
+ stage2_wp_puds(pgd, addr, next);
+ } while (pgd++, addr = next, addr != end);
+}
+
+/**
+ * kvm_mmu_wp_memory_region() - write protect stage 2 entries for memory slot
+ * @kvm: The KVM pointer
+ * @slot: The memory slot to write protect
+ *
+ * Called to start logging dirty pages after memory region
+ * KVM_MEM_LOG_DIRTY_PAGES operation is called. After this function returns
+ * all present PMD and PTEs are write protected in the memory region.
+ * Afterwards read of dirty page log can be called.
+ *
+ * Acquires kvm_mmu_lock. Called with kvm->slots_lock mutex acquired,
+ * serializing operations for VM memory regions.
+ */
+void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot)
+{
+ struct kvm_memory_slot *memslot = id_to_memslot(kvm->memslots, slot);
+ phys_addr_t start = memslot->base_gfn << PAGE_SHIFT;
+ phys_addr_t end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT;
+
+ spin_lock(&kvm->mmu_lock);
+ stage2_wp_range(kvm, start, end);
+ spin_unlock(&kvm->mmu_lock);
+ kvm_flush_remote_tlbs(kvm);
+}
+#endif
+
static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
struct kvm_memory_slot *memslot, unsigned long hva,
unsigned long fault_status)
@@ -1292,6 +1418,15 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
const struct kvm_memory_slot *old,
enum kvm_mr_change change)
{
+#ifdef CONFIG_ARM
+ /*
+ * At this point memslot has been committed and there is an
+ * allocated dirty_bitmap[], dirty pages will be be tracked while the
+ * memory slot is write protected.
+ */
+ if (change != KVM_MR_DELETE && mem->flags & KVM_MEM_LOG_DIRTY_PAGES)
+ kvm_mmu_wp_memory_region(kvm, mem->slot);
+#endif
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 10/36] KVM: arm: dirty logging write protect support
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (8 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 09/36] KVM: arm: Add initial dirty page locking support Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 11/36] KVM: arm: page logging 2nd stage fault handling Christoffer Dall
` (25 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
Add support to track dirty pages between user space KVM_GET_DIRTY_LOG ioctl
calls. We call kvm_get_dirty_log_protect() function to do most of the work.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
arch/arm/kvm/Kconfig | 1 +
arch/arm/kvm/arm.c | 34 ++++++++++++++++++++++++++++++++++
arch/arm/kvm/mmu.c | 22 ++++++++++++++++++++++
3 files changed, 57 insertions(+)
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index f27f336..a8d1ace 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -24,6 +24,7 @@ config KVM
select HAVE_KVM_ARCH_TLB_FLUSH_ALL
select KVM_MMIO
select KVM_ARM_HOST
+ select KVM_GENERIC_DIRTYLOG_READ_PROTECT
depends on ARM_VIRT_EXT && ARM_LPAE
---help---
Support hosting virtualized guest machines. You will also
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 2d6d910..1434410 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -787,9 +787,43 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
}
}
+/**
+ * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
+ * @kvm: kvm instance
+ * @log: slot id and address to which we copy the log
+ *
+ * Steps 1-4 below provide general overview of dirty page logging. See
+ * kvm_get_dirty_log_protect() function description for additional details.
+ *
+ * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
+ * always flush the TLB (step 4) even if previous step failed and the dirty
+ * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
+ * does not preclude user space subsequent dirty log read. Flushing TLB ensures
+ * writes will be marked dirty for next log read.
+ *
+ * 1. Take a snapshot of the bit and clear it if needed.
+ * 2. Write protect the corresponding page.
+ * 3. Copy the snapshot to the userspace.
+ * 4. Flush TLB's if needed.
+ */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
+#ifdef CONFIG_ARM
+ bool is_dirty = false;
+ int r;
+
+ mutex_lock(&kvm->slots_lock);
+
+ r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
+
+ if (is_dirty)
+ kvm_flush_remote_tlbs(kvm);
+
+ mutex_unlock(&kvm->slots_lock);
+ return r;
+#else /* arm64 */
return -EINVAL;
+#endif
}
static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index c9e5f38..565e903 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1029,6 +1029,28 @@ void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot)
spin_unlock(&kvm->mmu_lock);
kvm_flush_remote_tlbs(kvm);
}
+
+/**
+ * kvm_arch_mmu_write_protect_pt_masked() - write protect dirty pages
+ * @kvm: The KVM pointer
+ * @slot: The memory slot associated with mask
+ * @gfn_offset: The gfn offset in memory slot
+ * @mask: The mask of dirty pages at offset 'gfn_offset' in this memory
+ * slot to be write protected
+ *
+ * Walks bits set in mask write protects the associated pte's. Caller must
+ * acquire kvm_mmu_lock.
+ */
+void kvm_arch_mmu_write_protect_pt_masked(struct kvm *kvm,
+ struct kvm_memory_slot *slot,
+ gfn_t gfn_offset, unsigned long mask)
+{
+ phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
+ phys_addr_t start = (base_gfn + __ffs(mask)) << PAGE_SHIFT;
+ phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT;
+
+ stage2_wp_range(kvm, start, end);
+}
#endif
static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 11/36] KVM: arm: page logging 2nd stage fault handling
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (9 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 10/36] KVM: arm: dirty logging write protect support Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 12/36] KVM: arm64: ARMv8 header changes for page logging Christoffer Dall
` (24 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
This patch adds support for 2nd stage page fault handling while dirty page
logging. On huge page faults, huge pages are dissolved to normal pages, and
rebuilding of 2nd stage huge pages is blocked. In case migration is
canceled this restriction is removed and huge pages may be rebuilt again.
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm/kvm/mmu.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 88 insertions(+), 9 deletions(-)
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 565e903..6685c68 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -47,6 +47,18 @@ static phys_addr_t hyp_idmap_vector;
#define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x))
#define kvm_pud_huge(_x) pud_huge(_x)
+#define KVM_S2PTE_FLAG_IS_IOMAP (1UL << 0)
+#define KVM_S2_FLAG_LOGGING_ACTIVE (1UL << 1)
+
+static bool memslot_is_logging(struct kvm_memory_slot *memslot)
+{
+#ifdef CONFIG_ARM
+ return memslot->dirty_bitmap && !(memslot->flags & KVM_MEM_READONLY);
+#else
+ return false;
+#endif
+}
+
static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
{
/*
@@ -59,6 +71,25 @@ static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
}
+/**
+ * stage2_dissolve_pmd() - clear and flush huge PMD entry
+ * @kvm: pointer to kvm structure.
+ * @addr: IPA
+ * @pmd: pmd pointer for IPA
+ *
+ * Function clears a PMD entry, flushes addr 1st and 2nd stage TLBs. Marks all
+ * pages in the range dirty.
+ */
+static void stage2_dissolve_pmd(struct kvm *kvm, phys_addr_t addr, pmd_t *pmd)
+{
+ if (!kvm_pmd_huge(*pmd))
+ return;
+
+ pmd_clear(pmd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ put_page(virt_to_page(pmd));
+}
+
static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
int min, int max)
{
@@ -768,10 +799,15 @@ static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache
}
static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
- phys_addr_t addr, const pte_t *new_pte, bool iomap)
+ phys_addr_t addr, const pte_t *new_pte,
+ unsigned long flags)
{
pmd_t *pmd;
pte_t *pte, old_pte;
+ bool iomap = flags & KVM_S2PTE_FLAG_IS_IOMAP;
+ bool logging_active = flags & KVM_S2_FLAG_LOGGING_ACTIVE;
+
+ VM_BUG_ON(logging_active && !cache);
/* Create stage-2 page table mapping - Levels 0 and 1 */
pmd = stage2_get_pmd(kvm, cache, addr);
@@ -783,6 +819,13 @@ static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
return 0;
}
+ /*
+ * While dirty page logging - dissolve huge PMD, then continue on to
+ * allocate page.
+ */
+ if (logging_active)
+ stage2_dissolve_pmd(kvm, addr, pmd);
+
/* Create stage-2 page mappings - Level 2 */
if (pmd_none(*pmd)) {
if (!cache)
@@ -839,7 +882,8 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
if (ret)
goto out;
spin_lock(&kvm->mmu_lock);
- ret = stage2_set_pte(kvm, &cache, addr, &pte, true);
+ ret = stage2_set_pte(kvm, &cache, addr, &pte,
+ KVM_S2PTE_FLAG_IS_IOMAP);
spin_unlock(&kvm->mmu_lock);
if (ret)
goto out;
@@ -1067,6 +1111,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
pfn_t pfn;
pgprot_t mem_type = PAGE_S2;
bool fault_ipa_uncached;
+ bool logging_active = memslot_is_logging(memslot);
+ unsigned long flags = 0;
write_fault = kvm_is_write_fault(vcpu);
if (fault_status == FSC_PERM && !write_fault) {
@@ -1083,7 +1129,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
return -EFAULT;
}
- if (is_vm_hugetlb_page(vma)) {
+ if (is_vm_hugetlb_page(vma) && !logging_active) {
hugetlb = true;
gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT;
} else {
@@ -1124,12 +1170,30 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
if (is_error_pfn(pfn))
return -EFAULT;
- if (kvm_is_device_pfn(pfn))
+ if (kvm_is_device_pfn(pfn)) {
mem_type = PAGE_S2_DEVICE;
+ flags |= KVM_S2PTE_FLAG_IS_IOMAP;
+ } else if (logging_active) {
+ /*
+ * Faults on pages in a memslot with logging enabled
+ * should not be mapped with huge pages (it introduces churn
+ * and performance degradation), so force a pte mapping.
+ */
+ force_pte = true;
+ flags |= KVM_S2_FLAG_LOGGING_ACTIVE;
+
+ /*
+ * Only actually map the page as writable if this was a write
+ * fault.
+ */
+ if (!write_fault)
+ writable = false;
+ }
spin_lock(&kvm->mmu_lock);
if (mmu_notifier_retry(kvm, mmu_seq))
goto out_unlock;
+
if (!hugetlb && !force_pte)
hugetlb = transparent_hugepage_adjust(&pfn, &fault_ipa);
@@ -1147,17 +1211,17 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd);
} else {
pte_t new_pte = pfn_pte(pfn, mem_type);
+
if (writable) {
kvm_set_s2pte_writable(&new_pte);
kvm_set_pfn_dirty(pfn);
+ mark_page_dirty(kvm, gfn);
}
coherent_cache_guest_page(vcpu, hva, PAGE_SIZE,
fault_ipa_uncached);
- ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte,
- pgprot_val(mem_type) == pgprot_val(PAGE_S2_DEVICE));
+ ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, flags);
}
-
out_unlock:
spin_unlock(&kvm->mmu_lock);
kvm_release_pfn_clean(pfn);
@@ -1307,7 +1371,14 @@ static void kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data)
{
pte_t *pte = (pte_t *)data;
- stage2_set_pte(kvm, NULL, gpa, pte, false);
+ /*
+ * We can always call stage2_set_pte with KVM_S2PTE_FLAG_LOGGING_ACTIVE
+ * flag clear because MMU notifiers will have unmapped a huge PMD before
+ * calling ->change_pte() (which in turn calls kvm_set_spte_hva()) and
+ * therefore stage2_set_pte() never needs to clear out a huge PMD
+ * through this calling path.
+ */
+ stage2_set_pte(kvm, NULL, gpa, pte, 0);
}
@@ -1461,7 +1532,8 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
bool writable = !(mem->flags & KVM_MEM_READONLY);
int ret = 0;
- if (change != KVM_MR_CREATE && change != KVM_MR_MOVE)
+ if (change != KVM_MR_CREATE && change != KVM_MR_MOVE &&
+ change != KVM_MR_FLAGS_ONLY)
return 0;
/*
@@ -1512,6 +1584,10 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
phys_addr_t pa = (vma->vm_pgoff << PAGE_SHIFT) +
vm_start - vma->vm_start;
+ /* IO region dirty page logging not allowed */
+ if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES)
+ return -EINVAL;
+
ret = kvm_phys_addr_ioremap(kvm, gpa, pa,
vm_end - vm_start,
writable);
@@ -1521,6 +1597,9 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
hva = vm_end;
} while (hva < reg_end);
+ if (change == KVM_MR_FLAGS_ONLY)
+ return ret;
+
spin_lock(&kvm->mmu_lock);
if (ret)
unmap_stage2_range(kvm, mem->guest_phys_addr, mem->memory_size);
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 12/36] KVM: arm64: ARMv8 header changes for page logging
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (10 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 11/36] KVM: arm: page logging 2nd stage fault handling Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 13/36] KVM: arm64: Add HYP interface to flush VM Stage 1/2 TLB entries Christoffer Dall
` (23 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
This patch adds arm64 helpers to write protect pmds/ptes and retrieve
permissions while logging dirty pages. Also adds prototype to write protect
a memory slot and adds a pmd define to check for read-only pmds.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
arch/arm64/include/asm/kvm_asm.h | 1 +
arch/arm64/include/asm/kvm_host.h | 1 +
arch/arm64/include/asm/kvm_mmu.h | 21 +++++++++++++++++++++
arch/arm64/include/asm/pgtable-hwdef.h | 1 +
4 files changed, 24 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 4838421..4f7310f 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -126,6 +126,7 @@ extern char __kvm_hyp_vector[];
extern void __kvm_flush_vm_context(void);
extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
+extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 0b7dfdb..012af6c 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -199,6 +199,7 @@ struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
u64 kvm_call_hyp(void *hypfn, ...);
void force_vm_exit(const cpumask_t *mask);
+void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
int exception_index);
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 14a74f1..6657758 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -118,6 +118,27 @@ static inline void kvm_set_s2pmd_writable(pmd_t *pmd)
pmd_val(*pmd) |= PMD_S2_RDWR;
}
+static inline void kvm_set_s2pte_readonly(pte_t *pte)
+{
+ pte_val(*pte) = (pte_val(*pte) & ~PTE_S2_RDWR) | PTE_S2_RDONLY;
+}
+
+static inline bool kvm_s2pte_readonly(pte_t *pte)
+{
+ return (pte_val(*pte) & PTE_S2_RDWR) == PTE_S2_RDONLY;
+}
+
+static inline void kvm_set_s2pmd_readonly(pmd_t *pmd)
+{
+ pmd_val(*pmd) = (pmd_val(*pmd) & ~PMD_S2_RDWR) | PMD_S2_RDONLY;
+}
+
+static inline bool kvm_s2pmd_readonly(pmd_t *pmd)
+{
+ return (pmd_val(*pmd) & PMD_S2_RDWR) == PMD_S2_RDONLY;
+}
+
+
#define kvm_pgd_addr_end(addr, end) pgd_addr_end(addr, end)
#define kvm_pud_addr_end(addr, end) pud_addr_end(addr, end)
#define kvm_pmd_addr_end(addr, end) pmd_addr_end(addr, end)
diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
index 88174e0..5f930cc 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -119,6 +119,7 @@
#define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[2:1] */
#define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */
+#define PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[2:1] */
#define PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */
/*
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 13/36] KVM: arm64: Add HYP interface to flush VM Stage 1/2 TLB entries
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (11 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 12/36] KVM: arm64: ARMv8 header changes for page logging Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 14/36] KVM: arm/arm64: Enable Dirty Page logging for ARMv8 Christoffer Dall
` (22 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
This patch adds support for arm64 hyp interface to flush all TLBs associated
with VMID.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
arch/arm64/kvm/hyp.S | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S
index fbe909f..d9c4344 100644
--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S
@@ -1030,6 +1030,28 @@ ENTRY(__kvm_tlb_flush_vmid_ipa)
ret
ENDPROC(__kvm_tlb_flush_vmid_ipa)
+/**
+ * void __kvm_tlb_flush_vmid(struct kvm *kvm) - Flush per-VMID TLBs
+ * @struct kvm *kvm - pointer to kvm structure
+ *
+ * Invalidates all Stage 1 and 2 TLB entries for current VMID.
+ */
+ENTRY(__kvm_tlb_flush_vmid)
+ dsb ishst
+
+ kern_hyp_va x0
+ ldr x2, [x0, #KVM_VTTBR]
+ msr vttbr_el2, x2
+ isb
+
+ tlbi vmalls12e1is
+ dsb ish
+ isb
+
+ msr vttbr_el2, xzr
+ ret
+ENDPROC(__kvm_tlb_flush_vmid)
+
ENTRY(__kvm_flush_vm_context)
dsb ishst
tlbi alle1is
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 14/36] KVM: arm/arm64: Enable Dirty Page logging for ARMv8
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (12 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 13/36] KVM: arm64: Add HYP interface to flush VM Stage 1/2 TLB entries Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 15/36] arm/arm64: KVM: rework MPIDR assignment and add accessors Christoffer Dall
` (21 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Mario Smarduch <m.smarduch@samsung.com>
This patch enables ARMv8 ditry page logging support. Plugs ARMv8 into generic
layer through Kconfig symbol, and drops earlier ARM64 constraints to enable
logging at architecture layer.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
---
arch/arm/include/asm/kvm_host.h | 12 ------------
arch/arm/kvm/arm.c | 4 ----
arch/arm/kvm/mmu.c | 19 +++++++++++--------
arch/arm64/kvm/Kconfig | 2 ++
4 files changed, 13 insertions(+), 24 deletions(-)
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 38931d4..7d07eb8 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -221,18 +221,6 @@ static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
}
-/**
- * kvm_flush_remote_tlbs() - flush all VM TLB entries
- * @kvm: pointer to kvm structure.
- *
- * Interface to HYP function to flush all VM TLB entries without address
- * parameter.
- */
-static inline void kvm_flush_remote_tlbs(struct kvm *kvm)
-{
- kvm_call_hyp(__kvm_tlb_flush_vmid, kvm);
-}
-
static inline int kvm_arch_dev_ioctl_check_extension(long ext)
{
return 0;
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 1434410..74603a0 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -808,7 +808,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
*/
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
-#ifdef CONFIG_ARM
bool is_dirty = false;
int r;
@@ -821,9 +820,6 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
mutex_unlock(&kvm->slots_lock);
return r;
-#else /* arm64 */
- return -EINVAL;
-#endif
}
static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 6685c68..eb94597 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -52,11 +52,18 @@ static phys_addr_t hyp_idmap_vector;
static bool memslot_is_logging(struct kvm_memory_slot *memslot)
{
-#ifdef CONFIG_ARM
return memslot->dirty_bitmap && !(memslot->flags & KVM_MEM_READONLY);
-#else
- return false;
-#endif
+}
+
+/**
+ * kvm_flush_remote_tlbs() - flush all VM TLB entries for v7/8
+ * @kvm: pointer to kvm structure.
+ *
+ * Interface to HYP function to flush all VM TLB entries
+ */
+void kvm_flush_remote_tlbs(struct kvm *kvm)
+{
+ kvm_call_hyp(__kvm_tlb_flush_vmid, kvm);
}
static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
@@ -950,7 +957,6 @@ static bool kvm_is_device_pfn(unsigned long pfn)
return !pfn_valid(pfn);
}
-#ifdef CONFIG_ARM
/**
* stage2_wp_ptes - write protect PMD range
* @pmd: pointer to pmd entry
@@ -1095,7 +1101,6 @@ void kvm_arch_mmu_write_protect_pt_masked(struct kvm *kvm,
stage2_wp_range(kvm, start, end);
}
-#endif
static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
struct kvm_memory_slot *memslot, unsigned long hva,
@@ -1511,7 +1516,6 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
const struct kvm_memory_slot *old,
enum kvm_mr_change change)
{
-#ifdef CONFIG_ARM
/*
* At this point memslot has been committed and there is an
* allocated dirty_bitmap[], dirty pages will be be tracked while the
@@ -1519,7 +1523,6 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
*/
if (change != KVM_MR_DELETE && mem->flags & KVM_MEM_LOG_DIRTY_PAGES)
kvm_mmu_wp_memory_region(kvm, mem->slot);
-#endif
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 8ba85e9..3ce389b 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -22,10 +22,12 @@ config KVM
select PREEMPT_NOTIFIERS
select ANON_INODES
select HAVE_KVM_CPU_RELAX_INTERCEPT
+ select HAVE_KVM_ARCH_TLB_FLUSH_ALL
select KVM_MMIO
select KVM_ARM_HOST
select KVM_ARM_VGIC
select KVM_ARM_TIMER
+ select KVM_GENERIC_DIRTYLOG_READ_PROTECT
---help---
Support hosting virtualized guest machines.
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 15/36] arm/arm64: KVM: rework MPIDR assignment and add accessors
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (13 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 14/36] KVM: arm/arm64: Enable Dirty Page logging for ARMv8 Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 16/36] arm/arm64: KVM: pass down user space provided GIC type into vGIC code Christoffer Dall
` (20 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
The virtual MPIDR registers (containing topology information) for the
guest are currently mapped linearily to the vcpu_id. Improve this
mapping for arm64 by using three levels to not artificially limit the
number of vCPUs.
To help this, change and rename the kvm_vcpu_get_mpidr() function to
mask off the non-affinity bits in the MPIDR register.
Also add an accessor to later allow easier access to a vCPU with a
given MPIDR. Use this new accessor in the PSCI emulation.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm/include/asm/kvm_emulate.h | 5 +++--
arch/arm/include/asm/kvm_host.h | 2 ++
arch/arm/kvm/arm.c | 13 +++++++++++++
arch/arm/kvm/psci.c | 17 +++++------------
arch/arm64/include/asm/kvm_emulate.h | 5 +++--
arch/arm64/include/asm/kvm_host.h | 2 ++
arch/arm64/kvm/sys_regs.c | 13 +++++++++++--
7 files changed, 39 insertions(+), 18 deletions(-)
diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
index 66ce176..c528615 100644
--- a/arch/arm/include/asm/kvm_emulate.h
+++ b/arch/arm/include/asm/kvm_emulate.h
@@ -23,6 +23,7 @@
#include <asm/kvm_asm.h>
#include <asm/kvm_mmio.h>
#include <asm/kvm_arm.h>
+#include <asm/cputype.h>
unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
@@ -167,9 +168,9 @@ static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
}
-static inline unsigned long kvm_vcpu_get_mpidr(struct kvm_vcpu *vcpu)
+static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
{
- return vcpu->arch.cp15[c0_MPIDR];
+ return vcpu->arch.cp15[c0_MPIDR] & MPIDR_HWID_BITMASK;
}
static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 7d07eb8..2fa5174 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -236,6 +236,8 @@ int kvm_perf_teardown(void);
void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
+struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
+
static inline void kvm_arch_hardware_disable(void) {}
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 74603a0..a7b94ec 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -1075,6 +1075,19 @@ static void check_kvm_target_cpu(void *ret)
*(int *)ret = kvm_target_cpu();
}
+struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
+{
+ struct kvm_vcpu *vcpu;
+ int i;
+
+ mpidr &= MPIDR_HWID_BITMASK;
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
+ return vcpu;
+ }
+ return NULL;
+}
+
/**
* Initialize Hyp-mode and memory mappings on all CPUs.
*/
diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 58cb324..02fa8ef 100644
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -22,6 +22,7 @@
#include <asm/cputype.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_psci.h>
+#include <asm/kvm_host.h>
/*
* This is an implementation of the Power State Coordination Interface
@@ -66,25 +67,17 @@ static void kvm_psci_vcpu_off(struct kvm_vcpu *vcpu)
static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
{
struct kvm *kvm = source_vcpu->kvm;
- struct kvm_vcpu *vcpu = NULL, *tmp;
+ struct kvm_vcpu *vcpu = NULL;
wait_queue_head_t *wq;
unsigned long cpu_id;
unsigned long context_id;
- unsigned long mpidr;
phys_addr_t target_pc;
- int i;
- cpu_id = *vcpu_reg(source_vcpu, 1);
+ cpu_id = *vcpu_reg(source_vcpu, 1) & MPIDR_HWID_BITMASK;
if (vcpu_mode_is_32bit(source_vcpu))
cpu_id &= ~((u32) 0);
- kvm_for_each_vcpu(i, tmp, kvm) {
- mpidr = kvm_vcpu_get_mpidr(tmp);
- if ((mpidr & MPIDR_HWID_BITMASK) == (cpu_id & MPIDR_HWID_BITMASK)) {
- vcpu = tmp;
- break;
- }
- }
+ vcpu = kvm_mpidr_to_vcpu(kvm, cpu_id);
/*
* Make sure the caller requested a valid CPU and that the CPU is
@@ -155,7 +148,7 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
* then ON else OFF
*/
kvm_for_each_vcpu(i, tmp, kvm) {
- mpidr = kvm_vcpu_get_mpidr(tmp);
+ mpidr = kvm_vcpu_get_mpidr_aff(tmp);
if (((mpidr & target_affinity_mask) == target_affinity) &&
!tmp->arch.pause) {
return PSCI_0_2_AFFINITY_LEVEL_ON;
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index a6fa2d2..b3f1def 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -27,6 +27,7 @@
#include <asm/kvm_arm.h>
#include <asm/kvm_mmio.h>
#include <asm/ptrace.h>
+#include <asm/cputype.h>
unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num);
unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu);
@@ -192,9 +193,9 @@ static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC_TYPE;
}
-static inline unsigned long kvm_vcpu_get_mpidr(struct kvm_vcpu *vcpu)
+static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
{
- return vcpu_sys_reg(vcpu, MPIDR_EL1);
+ return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
}
static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 012af6c..ff8ee3e 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -207,6 +207,8 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
int kvm_perf_init(void);
int kvm_perf_teardown(void);
+struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
+
static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
phys_addr_t pgd_ptr,
unsigned long hyp_stack_ptr,
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 3d7c2df..136e679 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -252,10 +252,19 @@ static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
{
+ u64 mpidr;
+
/*
- * Simply map the vcpu_id into the Aff0 field of the MPIDR.
+ * Map the vcpu_id into the first three affinity level fields of
+ * the MPIDR. We limit the number of VCPUs in level 0 due to a
+ * limitation to 16 CPUs in that level in the ICC_SGIxR registers
+ * of the GICv3 to be able to address each CPU directly when
+ * sending IPIs.
*/
- vcpu_sys_reg(vcpu, MPIDR_EL1) = (1UL << 31) | (vcpu->vcpu_id & 0xff);
+ mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0);
+ mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1);
+ mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2);
+ vcpu_sys_reg(vcpu, MPIDR_EL1) = (1ULL << 31) | mpidr;
}
/* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 16/36] arm/arm64: KVM: pass down user space provided GIC type into vGIC code
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (14 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 15/36] arm/arm64: KVM: rework MPIDR assignment and add accessors Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 17/36] arm/arm64: KVM: refactor vgic_handle_mmio() function Christoffer Dall
` (19 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
With the introduction of a second emulated GIC model we need to let
userspace specify the GIC model to use for each VM. Pass the
userspace provided value down into the vGIC code and store it there
to differentiate later.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm/kvm/arm.c | 2 +-
include/kvm/arm_vgic.h | 7 +++++--
virt/kvm/arm/vgic.c | 15 +++++++++++++--
3 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index a7b94ec..3a51ffca 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -851,7 +851,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
switch (ioctl) {
case KVM_CREATE_IRQCHIP: {
if (vgic_present)
- return kvm_vgic_create(kvm);
+ return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
else
return -ENXIO;
}
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index ac4888d..525ce42 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -140,6 +140,9 @@ struct vgic_dist {
bool in_kernel;
bool ready;
+ /* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
+ u32 vgic_model;
+
int nr_cpus;
int nr_irqs;
@@ -275,7 +278,7 @@ struct kvm_exit_mmio;
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
int kvm_vgic_hyp_init(void);
int kvm_vgic_map_resources(struct kvm *kvm);
-int kvm_vgic_create(struct kvm *kvm);
+int kvm_vgic_create(struct kvm *kvm, u32 type);
void kvm_vgic_destroy(struct kvm *kvm);
void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
@@ -327,7 +330,7 @@ static inline int kvm_vgic_map_resources(struct kvm *kvm)
return 0;
}
-static inline int kvm_vgic_create(struct kvm *kvm)
+static inline int kvm_vgic_create(struct kvm *kvm, u32 type)
{
return 0;
}
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index c84f53df..283038e 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1698,6 +1698,16 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
int vcpu_id;
if (unlikely(!vgic_initialized(kvm))) {
+ /*
+ * We only provide the automatic initialization of the VGIC
+ * for the legacy case of a GICv2. Any other type must
+ * be explicitly initialized once setup with the respective
+ * KVM device call.
+ */
+ if (kvm->arch.vgic.vgic_model != KVM_DEV_TYPE_ARM_VGIC_V2) {
+ ret = -EBUSY;
+ goto out;
+ }
mutex_lock(&kvm->lock);
ret = vgic_init(kvm);
mutex_unlock(&kvm->lock);
@@ -1935,7 +1945,7 @@ out:
return ret;
}
-int kvm_vgic_create(struct kvm *kvm)
+int kvm_vgic_create(struct kvm *kvm, u32 type)
{
int i, vcpu_lock_idx = -1, ret;
struct kvm_vcpu *vcpu;
@@ -1967,6 +1977,7 @@ int kvm_vgic_create(struct kvm *kvm)
spin_lock_init(&kvm->arch.vgic.lock);
kvm->arch.vgic.in_kernel = true;
+ kvm->arch.vgic.vgic_model = type;
kvm->arch.vgic.vctrl_base = vgic->vctrl_base;
kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
@@ -2404,7 +2415,7 @@ static void vgic_destroy(struct kvm_device *dev)
static int vgic_create(struct kvm_device *dev, u32 type)
{
- return kvm_vgic_create(dev->kvm);
+ return kvm_vgic_create(dev->kvm, type);
}
static struct kvm_device_ops kvm_arm_vgic_v2_ops = {
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 17/36] arm/arm64: KVM: refactor vgic_handle_mmio() function
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (15 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 16/36] arm/arm64: KVM: pass down user space provided GIC type into vGIC code Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 18/36] arm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones Christoffer Dall
` (18 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
Currently we only need to deal with one MMIO region for the GIC
emulation (the GICv2 distributor), but we soon need to extend this.
Refactor the existing code to allow easier addition of different
ranges without code duplication.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
virt/kvm/arm/vgic.c | 73 ++++++++++++++++++++++++++++++++++++++---------------
1 file changed, 53 insertions(+), 20 deletions(-)
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 283038e..b5aa821 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1034,36 +1034,27 @@ static bool vgic_validate_access(const struct vgic_dist *dist,
}
/**
- * vgic_handle_mmio - handle an in-kernel MMIO access
+ * vgic_handle_mmio_range - handle an in-kernel MMIO access
* @vcpu: pointer to the vcpu performing the access
* @run: pointer to the kvm_run structure
* @mmio: pointer to the data describing the access
+ * @ranges: array of MMIO ranges in a given region
+ * @mmio_base: base address of that region
*
- * returns true if the MMIO access has been performed in kernel space,
- * and false if it needs to be emulated in user space.
+ * returns true if the MMIO access could be performed
*/
-bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
- struct kvm_exit_mmio *mmio)
+static bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ struct kvm_exit_mmio *mmio,
+ const struct mmio_range *ranges,
+ unsigned long mmio_base)
{
const struct mmio_range *range;
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- unsigned long base = dist->vgic_dist_base;
bool updated_state;
unsigned long offset;
- if (!irqchip_in_kernel(vcpu->kvm) ||
- mmio->phys_addr < base ||
- (mmio->phys_addr + mmio->len) > (base + KVM_VGIC_V2_DIST_SIZE))
- return false;
-
- /* We don't support ldrd / strd or ldm / stm to the emulated vgic */
- if (mmio->len > 4) {
- kvm_inject_dabt(vcpu, mmio->phys_addr);
- return true;
- }
-
- offset = mmio->phys_addr - base;
- range = find_matching_range(vgic_dist_ranges, mmio, offset);
+ offset = mmio->phys_addr - mmio_base;
+ range = find_matching_range(ranges, mmio, offset);
if (unlikely(!range || !range->handle_mmio)) {
pr_warn("Unhandled access %d %08llx %d\n",
mmio->is_write, mmio->phys_addr, mmio->len);
@@ -1071,7 +1062,7 @@ bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
}
spin_lock(&vcpu->kvm->arch.vgic.lock);
- offset = mmio->phys_addr - range->base - base;
+ offset -= range->base;
if (vgic_validate_access(dist, range, offset)) {
updated_state = range->handle_mmio(vcpu, mmio, offset);
} else {
@@ -1089,6 +1080,48 @@ bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
return true;
}
+static inline bool is_in_range(phys_addr_t addr, unsigned long len,
+ phys_addr_t baseaddr, unsigned long size)
+{
+ return (addr >= baseaddr) && (addr + len <= baseaddr + size);
+}
+
+static bool vgic_v2_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ struct kvm_exit_mmio *mmio)
+{
+ unsigned long base = vcpu->kvm->arch.vgic.vgic_dist_base;
+
+ if (!is_in_range(mmio->phys_addr, mmio->len, base,
+ KVM_VGIC_V2_DIST_SIZE))
+ return false;
+
+ /* GICv2 does not support accesses wider than 32 bits */
+ if (mmio->len > 4) {
+ kvm_inject_dabt(vcpu, mmio->phys_addr);
+ return true;
+ }
+
+ return vgic_handle_mmio_range(vcpu, run, mmio, vgic_dist_ranges, base);
+}
+
+/**
+ * vgic_handle_mmio - handle an in-kernel MMIO access for the GIC emulation
+ * @vcpu: pointer to the vcpu performing the access
+ * @run: pointer to the kvm_run structure
+ * @mmio: pointer to the data describing the access
+ *
+ * returns true if the MMIO access has been performed in kernel space,
+ * and false if it needs to be emulated in user space.
+ */
+bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ struct kvm_exit_mmio *mmio)
+{
+ if (!irqchip_in_kernel(vcpu->kvm))
+ return false;
+
+ return vgic_v2_handle_mmio(vcpu, run, mmio);
+}
+
static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi)
{
return dist->irq_sgi_sources + vcpu_id * VGIC_NR_SGIS + sgi;
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 18/36] arm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (16 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 17/36] arm/arm64: KVM: refactor vgic_handle_mmio() function Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 19/36] arm/arm64: KVM: introduce per-VM ops Christoffer Dall
` (17 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
Some GICv3 registers can and will be accessed as 64 bit registers.
Currently the register handling code can only deal with 32 bit
accesses, so we do two consecutive calls to cover this.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
virt/kvm/arm/vgic.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 50 insertions(+), 3 deletions(-)
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index b5aa821..a1fda79 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1033,6 +1033,53 @@ static bool vgic_validate_access(const struct vgic_dist *dist,
return true;
}
+/*
+ * Call the respective handler function for the given range.
+ * We split up any 64 bit accesses into two consecutive 32 bit
+ * handler calls and merge the result afterwards.
+ * We do this in a little endian fashion regardless of the host's
+ * or guest's endianness, because the GIC is always LE and the rest of
+ * the code (vgic_reg_access) also puts it in a LE fashion already.
+ * At this point we have already identified the handle function, so
+ * range points to that one entry and offset is relative to this.
+ */
+static bool call_range_handler(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ unsigned long offset,
+ const struct mmio_range *range)
+{
+ u32 *data32 = (void *)mmio->data;
+ struct kvm_exit_mmio mmio32;
+ bool ret;
+
+ if (likely(mmio->len <= 4))
+ return range->handle_mmio(vcpu, mmio, offset);
+
+ /*
+ * Any access bigger than 4 bytes (that we currently handle in KVM)
+ * is actually 8 bytes long, caused by a 64-bit access
+ */
+
+ mmio32.len = 4;
+ mmio32.is_write = mmio->is_write;
+
+ mmio32.phys_addr = mmio->phys_addr + 4;
+ if (mmio->is_write)
+ *(u32 *)mmio32.data = data32[1];
+ ret = range->handle_mmio(vcpu, &mmio32, offset + 4);
+ if (!mmio->is_write)
+ data32[1] = *(u32 *)mmio32.data;
+
+ mmio32.phys_addr = mmio->phys_addr;
+ if (mmio->is_write)
+ *(u32 *)mmio32.data = data32[0];
+ ret |= range->handle_mmio(vcpu, &mmio32, offset);
+ if (!mmio->is_write)
+ data32[0] = *(u32 *)mmio32.data;
+
+ return ret;
+}
+
/**
* vgic_handle_mmio_range - handle an in-kernel MMIO access
* @vcpu: pointer to the vcpu performing the access
@@ -1064,10 +1111,10 @@ static bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
spin_lock(&vcpu->kvm->arch.vgic.lock);
offset -= range->base;
if (vgic_validate_access(dist, range, offset)) {
- updated_state = range->handle_mmio(vcpu, mmio, offset);
+ updated_state = call_range_handler(vcpu, mmio, offset, range);
} else {
- vgic_reg_access(mmio, NULL, offset,
- ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ if (!mmio->is_write)
+ memset(mmio->data, 0, mmio->len);
updated_state = false;
}
spin_unlock(&vcpu->kvm->arch.vgic.lock);
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 19/36] arm/arm64: KVM: introduce per-VM ops
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (17 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 18/36] arm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 20/36] arm/arm64: KVM: move kvm_register_device_ops() into vGIC probing Christoffer Dall
` (16 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
Currently we only have one virtual GIC model supported, so all guests
use the same emulation code. With the addition of another model we
end up with different guests using potentially different vGIC models,
so we have to split up some functions to be per VM.
Introduce a vgic_vm_ops struct to hold function pointers for those
functions that are different and provide the necessary code to
initialize them.
Also split up the vgic_init() function to separate out VGIC model
specific functionality into a separate function, which will later be
different for a GICv3 model.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
include/kvm/arm_vgic.h | 11 +++++++
virt/kvm/arm/vgic.c | 86 ++++++++++++++++++++++++++++++++++++++++++++------
2 files changed, 87 insertions(+), 10 deletions(-)
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 525ce42..dd24396 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -134,6 +134,15 @@ struct vgic_params {
void __iomem *vctrl_base;
};
+struct vgic_vm_ops {
+ bool (*handle_mmio)(struct kvm_vcpu *, struct kvm_run *,
+ struct kvm_exit_mmio *);
+ bool (*queue_sgi)(struct kvm_vcpu *, int irq);
+ void (*add_sgi_source)(struct kvm_vcpu *, int irq, int source);
+ int (*init_model)(struct kvm *);
+ int (*map_resources)(struct kvm *, const struct vgic_params *);
+};
+
struct vgic_dist {
#ifdef CONFIG_KVM_ARM_VGIC
spinlock_t lock;
@@ -215,6 +224,8 @@ struct vgic_dist {
/* Bitmap indicating which CPU has something pending */
unsigned long *irq_pending_on_cpu;
+
+ struct vgic_vm_ops vm_ops;
#endif
};
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index a1fda79..9b63141 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -106,6 +106,21 @@ static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
static const struct vgic_ops *vgic_ops;
static const struct vgic_params *vgic;
+static void add_sgi_source(struct kvm_vcpu *vcpu, int irq, int source)
+{
+ vcpu->kvm->arch.vgic.vm_ops.add_sgi_source(vcpu, irq, source);
+}
+
+static bool queue_sgi(struct kvm_vcpu *vcpu, int irq)
+{
+ return vcpu->kvm->arch.vgic.vm_ops.queue_sgi(vcpu, irq);
+}
+
+int kvm_vgic_map_resources(struct kvm *kvm)
+{
+ return kvm->arch.vgic.vm_ops.map_resources(kvm, vgic);
+}
+
/*
* struct vgic_bitmap contains a bitmap made of unsigned longs, but
* extracts u32s out of them.
@@ -762,6 +777,13 @@ static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
return false;
}
+static void vgic_v2_add_sgi_source(struct kvm_vcpu *vcpu, int irq, int source)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+ *vgic_get_sgi_sources(dist, vcpu->vcpu_id, irq) |= 1 << source;
+}
+
/**
* vgic_unqueue_irqs - move pending IRQs from LRs to the distributor
* @vgic_cpu: Pointer to the vgic_cpu struct holding the LRs
@@ -776,9 +798,7 @@ static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
*/
static void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
{
- struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- int vcpu_id = vcpu->vcpu_id;
int i;
for_each_set_bit(i, vgic_cpu->lr_used, vgic_cpu->nr_lr) {
@@ -805,7 +825,7 @@ static void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
*/
vgic_dist_irq_set_pending(vcpu, lr.irq);
if (lr.irq < VGIC_NR_SGIS)
- *vgic_get_sgi_sources(dist, vcpu_id, lr.irq) |= 1 << lr.source;
+ add_sgi_source(vcpu, lr.irq, lr.source);
lr.state &= ~LR_STATE_PENDING;
vgic_set_lr(vcpu, i, lr);
@@ -1159,6 +1179,7 @@ static bool vgic_v2_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
*
* returns true if the MMIO access has been performed in kernel space,
* and false if it needs to be emulated in user space.
+ * Calls the actual handling routine for the selected VGIC model.
*/
bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_exit_mmio *mmio)
@@ -1166,7 +1187,12 @@ bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
if (!irqchip_in_kernel(vcpu->kvm))
return false;
- return vgic_v2_handle_mmio(vcpu, run, mmio);
+ /*
+ * This will currently call either vgic_v2_handle_mmio() or
+ * vgic_v3_handle_mmio(), which in turn will call
+ * vgic_handle_mmio_range() defined above.
+ */
+ return vcpu->kvm->arch.vgic.vm_ops.handle_mmio(vcpu, run, mmio);
}
static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi)
@@ -1418,7 +1444,7 @@ static bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
return true;
}
-static bool vgic_queue_sgi(struct kvm_vcpu *vcpu, int irq)
+static bool vgic_v2_queue_sgi(struct kvm_vcpu *vcpu, int irq)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
unsigned long sources;
@@ -1493,7 +1519,7 @@ static void __kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
/* SGIs */
for_each_set_bit(i, vgic_cpu->pending_percpu, VGIC_NR_SGIS) {
- if (!vgic_queue_sgi(vcpu, i))
+ if (!queue_sgi(vcpu, i))
overflow = 1;
}
@@ -1883,6 +1909,16 @@ void kvm_vgic_destroy(struct kvm *kvm)
dist->nr_cpus = 0;
}
+static int vgic_v2_init_model(struct kvm *kvm)
+{
+ int i;
+
+ for (i = VGIC_NR_PRIVATE_IRQS; i < kvm->arch.vgic.nr_irqs; i += 4)
+ vgic_set_target_reg(kvm, 0, i);
+
+ return 0;
+}
+
/*
* Allocate and initialize the various data structures. Must be called
* with kvm->lock held!
@@ -1942,8 +1978,9 @@ static int vgic_init(struct kvm *kvm)
if (ret)
goto out;
- for (i = VGIC_NR_PRIVATE_IRQS; i < dist->nr_irqs; i += 4)
- vgic_set_target_reg(kvm, 0, i);
+ ret = kvm->arch.vgic.vm_ops.init_model(kvm);
+ if (ret)
+ goto out;
kvm_for_each_vcpu(vcpu_id, vcpu, kvm) {
ret = vgic_vcpu_init_maps(vcpu, nr_irqs);
@@ -1980,7 +2017,8 @@ out:
* can't do this at creation time, because user space must first set the
* virtual CPU interface address in the guest physical address space.
*/
-int kvm_vgic_map_resources(struct kvm *kvm)
+static int vgic_v2_map_resources(struct kvm *kvm,
+ const struct vgic_params *params)
{
int ret = 0;
@@ -2010,7 +2048,7 @@ int kvm_vgic_map_resources(struct kvm *kvm)
}
ret = kvm_phys_addr_ioremap(kvm, kvm->arch.vgic.vgic_cpu_base,
- vgic->vcpu_base, KVM_VGIC_V2_CPU_SIZE,
+ params->vcpu_base, KVM_VGIC_V2_CPU_SIZE,
true);
if (ret) {
kvm_err("Unable to remap VGIC CPU to VCPU\n");
@@ -2025,6 +2063,30 @@ out:
return ret;
}
+static void vgic_v2_init_emulation(struct kvm *kvm)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+
+ dist->vm_ops.handle_mmio = vgic_v2_handle_mmio;
+ dist->vm_ops.queue_sgi = vgic_v2_queue_sgi;
+ dist->vm_ops.add_sgi_source = vgic_v2_add_sgi_source;
+ dist->vm_ops.init_model = vgic_v2_init_model;
+ dist->vm_ops.map_resources = vgic_v2_map_resources;
+}
+
+static int init_vgic_model(struct kvm *kvm, int type)
+{
+ switch (type) {
+ case KVM_DEV_TYPE_ARM_VGIC_V2:
+ vgic_v2_init_emulation(kvm);
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
int kvm_vgic_create(struct kvm *kvm, u32 type)
{
int i, vcpu_lock_idx = -1, ret;
@@ -2055,6 +2117,10 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
}
ret = 0;
+ ret = init_vgic_model(kvm, type);
+ if (ret)
+ goto out_unlock;
+
spin_lock_init(&kvm->arch.vgic.lock);
kvm->arch.vgic.in_kernel = true;
kvm->arch.vgic.vgic_model = type;
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 20/36] arm/arm64: KVM: move kvm_register_device_ops() into vGIC probing
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (18 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 19/36] arm/arm64: KVM: introduce per-VM ops Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 21/36] arm/arm64: KVM: dont rely on a valid GICH base address Christoffer Dall
` (15 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
Currently we unconditionally register the GICv2 emulation device
during the host's KVM initialization. Since with GICv3 support we
may end up with only v2 or only v3 or both supported, we move the
registration into the GIC probing function, where we will later know
which combination is valid.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
include/linux/kvm_host.h | 1 +
virt/kvm/arm/vgic-v2.c | 2 ++
virt/kvm/arm/vgic-v3.c | 1 +
virt/kvm/arm/vgic.c | 5 ++---
4 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 3b934cc..25d7ce3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1051,6 +1051,7 @@ void kvm_unregister_device_ops(u32 type);
extern struct kvm_device_ops kvm_mpic_ops;
extern struct kvm_device_ops kvm_xics_ops;
+extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
diff --git a/virt/kvm/arm/vgic-v2.c b/virt/kvm/arm/vgic-v2.c
index 2935405..e1cd3cb 100644
--- a/virt/kvm/arm/vgic-v2.c
+++ b/virt/kvm/arm/vgic-v2.c
@@ -229,6 +229,8 @@ int vgic_v2_probe(struct device_node *vgic_node,
goto out_unmap;
}
+ kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2);
+
vgic->vcpu_base = vcpu_res.start;
kvm_info("%s@%llx IRQ%d\n", vgic_node->name,
diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c
index 1c2c8ee..d14c75f 100644
--- a/virt/kvm/arm/vgic-v3.c
+++ b/virt/kvm/arm/vgic-v3.c
@@ -230,6 +230,7 @@ int vgic_v3_probe(struct device_node *vgic_node,
ret = -ENXIO;
goto out;
}
+ kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2);
vgic->vcpu_base = vcpu_res.start;
vgic->vctrl_base = NULL;
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 9b63141..69f6e7a 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -2564,7 +2564,7 @@ static int vgic_create(struct kvm_device *dev, u32 type)
return kvm_vgic_create(dev->kvm, type);
}
-static struct kvm_device_ops kvm_arm_vgic_v2_ops = {
+struct kvm_device_ops kvm_arm_vgic_v2_ops = {
.name = "kvm-arm-vgic",
.create = vgic_create,
.destroy = vgic_destroy,
@@ -2643,8 +2643,7 @@ int kvm_vgic_hyp_init(void)
on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1);
- return kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
- KVM_DEV_TYPE_ARM_VGIC_V2);
+ return 0;
out_free_irq:
free_percpu_irq(vgic->maint_irq, kvm_get_running_vcpus());
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 21/36] arm/arm64: KVM: dont rely on a valid GICH base address
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (19 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 20/36] arm/arm64: KVM: move kvm_register_device_ops() into vGIC probing Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 22/36] arm/arm64: KVM: make the maximum number of vCPUs a per-VM value Christoffer Dall
` (14 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
To check whether the vGIC was already initialized, we currently check
the GICH base address for not being NULL. Since with GICv3 we may
get along without this address, lets use the irqchip_in_kernel()
function to detect an already initialized vGIC.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
virt/kvm/arm/vgic.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 69f6e7a..1c3b75e 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -2094,7 +2094,7 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
mutex_lock(&kvm->lock);
- if (kvm->arch.vgic.vctrl_base) {
+ if (irqchip_in_kernel(kvm)) {
ret = -EEXIST;
goto out;
}
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 22/36] arm/arm64: KVM: make the maximum number of vCPUs a per-VM value
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (20 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 21/36] arm/arm64: KVM: dont rely on a valid GICH base address Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 23/36] arm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable Christoffer Dall
` (13 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
Currently the maximum number of vCPUs supported is a global value
limited by the used GIC model. GICv3 will lift this limit, but we
still need to observe it for guests using GICv2.
So the maximum number of vCPUs is per-VM value, depending on the
GIC model the guest uses.
Store and check the value in struct kvm_arch, but keep it down to
8 for now.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm/include/asm/kvm_host.h | 1 +
arch/arm/kvm/arm.c | 8 ++++++++
arch/arm64/include/asm/kvm_host.h | 3 +++
include/kvm/arm_vgic.h | 8 ++++++++
virt/kvm/arm/vgic-v2.c | 1 +
virt/kvm/arm/vgic-v3.c | 1 +
virt/kvm/arm/vgic.c | 16 ++++++++++++++++
7 files changed, 38 insertions(+)
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 2fa5174..bde4946 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -68,6 +68,7 @@ struct kvm_arch {
/* Interrupt controller */
struct vgic_dist vgic;
+ int max_vcpus;
};
#define KVM_NR_MEM_OBJS 40
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 3a51ffca..6fbfa5f 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -132,6 +132,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
/* Mark the initial VMID generation invalid */
kvm->arch.vmid_gen = 0;
+ /* The maximum number of VCPUs is limited by the host's GIC model */
+ kvm->arch.max_vcpus = kvm_vgic_get_max_vcpus();
+
return ret;
out_free_stage2_pgd:
kvm_free_stage2_pgd(kvm);
@@ -218,6 +221,11 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
goto out;
}
+ if (id >= kvm->arch.max_vcpus) {
+ err = -EINVAL;
+ goto out;
+ }
+
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
if (!vcpu) {
err = -ENOMEM;
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index ff8ee3e..2c49aa4 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -59,6 +59,9 @@ struct kvm_arch {
/* VTTBR value associated with above pgd and vmid */
u64 vttbr;
+ /* The maximum number of vCPUs depends on the used GIC model */
+ int max_vcpus;
+
/* Interrupt controller */
struct vgic_dist vgic;
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index dd24396..1c0e9db 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -33,6 +33,7 @@
#define VGIC_V2_MAX_LRS (1 << 6)
#define VGIC_V3_MAX_LRS 16
#define VGIC_MAX_IRQS 1024
+#define VGIC_V2_MAX_CPUS 8
/* Sanity checks... */
#if (KVM_MAX_VCPUS > 8)
@@ -132,6 +133,7 @@ struct vgic_params {
unsigned int maint_irq;
/* Virtual control interface base address */
void __iomem *vctrl_base;
+ int max_gic_vcpus;
};
struct vgic_vm_ops {
@@ -289,6 +291,7 @@ struct kvm_exit_mmio;
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
int kvm_vgic_hyp_init(void);
int kvm_vgic_map_resources(struct kvm *kvm);
+int kvm_vgic_get_max_vcpus(void);
int kvm_vgic_create(struct kvm *kvm, u32 type);
void kvm_vgic_destroy(struct kvm *kvm);
void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
@@ -393,6 +396,11 @@ static inline bool vgic_ready(struct kvm *kvm)
{
return true;
}
+
+static inline int kvm_vgic_get_max_vcpus(void)
+{
+ return KVM_MAX_VCPUS;
+}
#endif
#endif
diff --git a/virt/kvm/arm/vgic-v2.c b/virt/kvm/arm/vgic-v2.c
index e1cd3cb..e8b82b2 100644
--- a/virt/kvm/arm/vgic-v2.c
+++ b/virt/kvm/arm/vgic-v2.c
@@ -237,6 +237,7 @@ int vgic_v2_probe(struct device_node *vgic_node,
vctrl_res.start, vgic->maint_irq);
vgic->type = VGIC_V2;
+ vgic->max_gic_vcpus = VGIC_V2_MAX_CPUS;
*ops = &vgic_v2_ops;
*params = vgic;
goto out;
diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c
index d14c75f..ea39bad 100644
--- a/virt/kvm/arm/vgic-v3.c
+++ b/virt/kvm/arm/vgic-v3.c
@@ -235,6 +235,7 @@ int vgic_v3_probe(struct device_node *vgic_node,
vgic->vcpu_base = vcpu_res.start;
vgic->vctrl_base = NULL;
vgic->type = VGIC_V3;
+ vgic->max_gic_vcpus = KVM_MAX_VCPUS;
kvm_info("%s@%llx IRQ%d\n", vgic_node->name,
vcpu_res.start, vgic->maint_irq);
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 1c3b75e..2126bf5 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1878,6 +1878,17 @@ static int vgic_vcpu_init_maps(struct kvm_vcpu *vcpu, int nr_irqs)
return 0;
}
+/**
+ * kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW
+ *
+ * The host's GIC naturally limits the maximum amount of VCPUs a guest
+ * can use.
+ */
+int kvm_vgic_get_max_vcpus(void)
+{
+ return vgic->max_gic_vcpus;
+}
+
void kvm_vgic_destroy(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
@@ -2072,6 +2083,8 @@ static void vgic_v2_init_emulation(struct kvm *kvm)
dist->vm_ops.add_sgi_source = vgic_v2_add_sgi_source;
dist->vm_ops.init_model = vgic_v2_init_model;
dist->vm_ops.map_resources = vgic_v2_map_resources;
+
+ kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
}
static int init_vgic_model(struct kvm *kvm, int type)
@@ -2084,6 +2097,9 @@ static int init_vgic_model(struct kvm *kvm, int type)
return -ENODEV;
}
+ if (atomic_read(&kvm->online_vcpus) > kvm->arch.max_vcpus)
+ return -E2BIG;
+
return 0;
}
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 23/36] arm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (21 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 22/36] arm/arm64: KVM: make the maximum number of vCPUs a per-VM value Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 24/36] arm/arm64: KVM: refactor MMIO accessors Christoffer Dall
` (12 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
ICC_SRE_EL1 is a system register allowing msr/mrs accesses to the
GIC CPU interface for EL1 (guests). Currently we force it to 0, but
for proper GICv3 support we have to allow guests to use it (depending
on their selected virtual GIC model).
So add ICC_SRE_EL1 to the list of saved/restored registers on a
world switch, but actually disallow a guest to change it by only
restoring a fixed, once-initialized value.
This value depends on the GIC model userland has chosen for a guest.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm64/kernel/asm-offsets.c | 1 +
arch/arm64/kvm/vgic-v3-switch.S | 14 +++++++++-----
include/kvm/arm_vgic.h | 1 +
virt/kvm/arm/vgic-v3.c | 8 ++++++--
4 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index 9a9fce0..9d34486 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -140,6 +140,7 @@ int main(void)
DEFINE(VGIC_V2_CPU_ELRSR, offsetof(struct vgic_cpu, vgic_v2.vgic_elrsr));
DEFINE(VGIC_V2_CPU_APR, offsetof(struct vgic_cpu, vgic_v2.vgic_apr));
DEFINE(VGIC_V2_CPU_LR, offsetof(struct vgic_cpu, vgic_v2.vgic_lr));
+ DEFINE(VGIC_V3_CPU_SRE, offsetof(struct vgic_cpu, vgic_v3.vgic_sre));
DEFINE(VGIC_V3_CPU_HCR, offsetof(struct vgic_cpu, vgic_v3.vgic_hcr));
DEFINE(VGIC_V3_CPU_VMCR, offsetof(struct vgic_cpu, vgic_v3.vgic_vmcr));
DEFINE(VGIC_V3_CPU_MISR, offsetof(struct vgic_cpu, vgic_v3.vgic_misr));
diff --git a/arch/arm64/kvm/vgic-v3-switch.S b/arch/arm64/kvm/vgic-v3-switch.S
index d160469..617a012 100644
--- a/arch/arm64/kvm/vgic-v3-switch.S
+++ b/arch/arm64/kvm/vgic-v3-switch.S
@@ -148,17 +148,18 @@
* x0: Register pointing to VCPU struct
*/
.macro restore_vgic_v3_state
- // Disable SRE_EL1 access. Necessary, otherwise
- // ICH_VMCR_EL2.VFIQEn becomes one, and FIQ happens...
- msr_s ICC_SRE_EL1, xzr
- isb
-
// Compute the address of struct vgic_cpu
add x3, x0, #VCPU_VGIC_CPU
// Restore all interesting registers
ldr w4, [x3, #VGIC_V3_CPU_HCR]
ldr w5, [x3, #VGIC_V3_CPU_VMCR]
+ ldr w25, [x3, #VGIC_V3_CPU_SRE]
+
+ msr_s ICC_SRE_EL1, x25
+
+ // make sure SRE is valid before writing the other registers
+ isb
msr_s ICH_HCR_EL2, x4
msr_s ICH_VMCR_EL2, x5
@@ -244,9 +245,12 @@
dsb sy
// Prevent the guest from touching the GIC system registers
+ // if SRE isn't enabled for GICv3 emulation
+ cbnz x25, 1f
mrs_s x5, ICC_SRE_EL2
and x5, x5, #~ICC_SRE_EL2_ENABLE
msr_s ICC_SRE_EL2, x5
+1:
.endm
ENTRY(__save_vgic_v3_state)
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 1c0e9db..ff04afd 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -245,6 +245,7 @@ struct vgic_v3_cpu_if {
#ifdef CONFIG_ARM_GIC_V3
u32 vgic_hcr;
u32 vgic_vmcr;
+ u32 vgic_sre; /* Restored only, change ignored */
u32 vgic_misr; /* Saved only */
u32 vgic_eisr; /* Saved only */
u32 vgic_elrsr; /* Saved only */
diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c
index ea39bad..5249048 100644
--- a/virt/kvm/arm/vgic-v3.c
+++ b/virt/kvm/arm/vgic-v3.c
@@ -145,15 +145,19 @@ static void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
static void vgic_v3_enable(struct kvm_vcpu *vcpu)
{
+ struct vgic_v3_cpu_if *vgic_v3 = &vcpu->arch.vgic_cpu.vgic_v3;
+
/*
* By forcing VMCR to zero, the GIC will restore the binary
* points to their reset values. Anything else resets to zero
* anyway.
*/
- vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr = 0;
+ vgic_v3->vgic_vmcr = 0;
+
+ vgic_v3->vgic_sre = 0;
/* Get the show on the road... */
- vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr = ICH_HCR_EN;
+ vgic_v3->vgic_hcr = ICH_HCR_EN;
}
static const struct vgic_ops vgic_v3_ops = {
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 24/36] arm/arm64: KVM: refactor MMIO accessors
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (22 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 23/36] arm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 25/36] arm/arm64: KVM: refactor/wrap vgic_set/get_attr() Christoffer Dall
` (11 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
The MMIO accessors for GICD_I[CS]ENABLER, GICD_I[CS]PENDR and
GICD_ICFGR behave very similar for GICv2 and GICv3, although the way
the affected VCPU is determined differs.
Since we need them to access the registers from three different
places in the future, we factor out a generic, backend-facing
implementation and use small wrappers in the current GICv2 emulation.
This will ease adding GICv3 accessors later.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
virt/kvm/arm/vgic.c | 126 ++++++++++++++++++++++++++++++----------------------
1 file changed, 74 insertions(+), 52 deletions(-)
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 2126bf5..7589e2c 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -492,64 +492,66 @@ static bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu,
return false;
}
-static bool handle_mmio_set_enable_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
+static bool vgic_handle_enable_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset, int vcpu_id, int access)
{
- u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_enabled,
- vcpu->vcpu_id, offset);
- vgic_reg_access(mmio, reg, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT);
+ u32 *reg;
+ int mode = ACCESS_READ_VALUE | access;
+ struct kvm_vcpu *target_vcpu = kvm_get_vcpu(kvm, vcpu_id);
+
+ reg = vgic_bitmap_get_reg(&kvm->arch.vgic.irq_enabled, vcpu_id, offset);
+ vgic_reg_access(mmio, reg, offset, mode);
if (mmio->is_write) {
- vgic_update_state(vcpu->kvm);
+ if (access & ACCESS_WRITE_CLEARBIT) {
+ if (offset < 4) /* Force SGI enabled */
+ *reg |= 0xffff;
+ vgic_retire_disabled_irqs(target_vcpu);
+ }
+ vgic_update_state(kvm);
return true;
}
return false;
}
+static bool handle_mmio_set_enable_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id, ACCESS_WRITE_SETBIT);
+}
+
static bool handle_mmio_clear_enable_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
- u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_enabled,
- vcpu->vcpu_id, offset);
- vgic_reg_access(mmio, reg, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
- if (mmio->is_write) {
- if (offset < 4) /* Force SGI enabled */
- *reg |= 0xffff;
- vgic_retire_disabled_irqs(vcpu);
- vgic_update_state(vcpu->kvm);
- return true;
- }
-
- return false;
+ return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id, ACCESS_WRITE_CLEARBIT);
}
-static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu,
+static bool vgic_handle_set_pending_reg(struct kvm *kvm,
struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
+ phys_addr_t offset, int vcpu_id)
{
u32 *reg, orig;
u32 level_mask;
- struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ int mode = ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT;
+ struct vgic_dist *dist = &kvm->arch.vgic;
- reg = vgic_bitmap_get_reg(&dist->irq_cfg, vcpu->vcpu_id, offset);
+ reg = vgic_bitmap_get_reg(&dist->irq_cfg, vcpu_id, offset);
level_mask = (~(*reg));
/* Mark both level and edge triggered irqs as pending */
- reg = vgic_bitmap_get_reg(&dist->irq_pending, vcpu->vcpu_id, offset);
+ reg = vgic_bitmap_get_reg(&dist->irq_pending, vcpu_id, offset);
orig = *reg;
- vgic_reg_access(mmio, reg, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT);
+ vgic_reg_access(mmio, reg, offset, mode);
if (mmio->is_write) {
/* Set the soft-pending flag only for level-triggered irqs */
reg = vgic_bitmap_get_reg(&dist->irq_soft_pend,
- vcpu->vcpu_id, offset);
- vgic_reg_access(mmio, reg, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT);
+ vcpu_id, offset);
+ vgic_reg_access(mmio, reg, offset, mode);
*reg &= level_mask;
/* Ignore writes to SGIs */
@@ -558,31 +560,30 @@ static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu,
*reg |= orig & 0xffff;
}
- vgic_update_state(vcpu->kvm);
+ vgic_update_state(kvm);
return true;
}
return false;
}
-static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu,
+static bool vgic_handle_clear_pending_reg(struct kvm *kvm,
struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
+ phys_addr_t offset, int vcpu_id)
{
u32 *level_active;
u32 *reg, orig;
- struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ int mode = ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT;
+ struct vgic_dist *dist = &kvm->arch.vgic;
- reg = vgic_bitmap_get_reg(&dist->irq_pending, vcpu->vcpu_id, offset);
+ reg = vgic_bitmap_get_reg(&dist->irq_pending, vcpu_id, offset);
orig = *reg;
- vgic_reg_access(mmio, reg, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
+ vgic_reg_access(mmio, reg, offset, mode);
if (mmio->is_write) {
/* Re-set level triggered level-active interrupts */
level_active = vgic_bitmap_get_reg(&dist->irq_level,
- vcpu->vcpu_id, offset);
- reg = vgic_bitmap_get_reg(&dist->irq_pending,
- vcpu->vcpu_id, offset);
+ vcpu_id, offset);
+ reg = vgic_bitmap_get_reg(&dist->irq_pending, vcpu_id, offset);
*reg |= *level_active;
/* Ignore writes to SGIs */
@@ -593,17 +594,31 @@ static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu,
/* Clear soft-pending flags */
reg = vgic_bitmap_get_reg(&dist->irq_soft_pend,
- vcpu->vcpu_id, offset);
- vgic_reg_access(mmio, reg, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
+ vcpu_id, offset);
+ vgic_reg_access(mmio, reg, offset, mode);
- vgic_update_state(vcpu->kvm);
+ vgic_update_state(kvm);
return true;
}
-
return false;
}
+static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ return vgic_handle_set_pending_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id);
+}
+
+static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ return vgic_handle_clear_pending_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id);
+}
+
static bool handle_mmio_priority_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
@@ -726,14 +741,10 @@ static u16 vgic_cfg_compress(u32 val)
* LSB is always 0. As such, we only keep the upper bit, and use the
* two above functions to compress/expand the bits
*/
-static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio, phys_addr_t offset)
+static bool vgic_handle_cfg_reg(u32 *reg, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
{
u32 val;
- u32 *reg;
-
- reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
- vcpu->vcpu_id, offset >> 1);
if (offset & 4)
val = *reg >> 16;
@@ -762,6 +773,17 @@ static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
return false;
}
+static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ u32 *reg;
+
+ reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
+ vcpu->vcpu_id, offset >> 1);
+
+ return vgic_handle_cfg_reg(reg, mmio, offset);
+}
+
static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio, phys_addr_t offset)
{
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 25/36] arm/arm64: KVM: refactor/wrap vgic_set/get_attr()
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (23 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 24/36] arm/arm64: KVM: refactor MMIO accessors Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 26/36] arm/arm64: KVM: add vgic.h header file Christoffer Dall
` (10 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
vgic_set_attr() and vgic_get_attr() contain both code specific for
the emulated GIC as well as code for the userland facing, generic
part of the GIC.
Split the guest GIC facing code of from the generic part to allow
easier splitting later.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
virt/kvm/arm/vgic.c | 78 ++++++++++++++++++++++++++++++++++++-----------------
1 file changed, 54 insertions(+), 24 deletions(-)
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 7589e2c..06073fa 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -2440,7 +2440,8 @@ out:
return ret;
}
-static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+static int vgic_set_common_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
{
int r;
@@ -2456,17 +2457,6 @@ static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
r = kvm_vgic_addr(dev->kvm, type, &addr, true);
return (r == -ENODEV) ? -ENXIO : r;
}
-
- case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
- case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
- u32 __user *uaddr = (u32 __user *)(long)attr->addr;
- u32 reg;
-
- if (get_user(reg, uaddr))
- return -EFAULT;
-
- return vgic_attr_regs_access(dev, attr, ®, true);
- }
case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u32 val;
@@ -2510,7 +2500,33 @@ static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return -ENXIO;
}
-static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+ int ret;
+
+ ret = vgic_set_common_attr(dev, attr);
+ if (ret != -ENXIO)
+ return ret;
+
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+ case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
+ u32 __user *uaddr = (u32 __user *)(long)attr->addr;
+ u32 reg;
+
+ if (get_user(reg, uaddr))
+ return -EFAULT;
+
+ return vgic_attr_regs_access(dev, attr, ®, true);
+ }
+
+ }
+
+ return -ENXIO;
+}
+
+static int vgic_get_common_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
{
int r = -ENXIO;
@@ -2528,27 +2544,41 @@ static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return -EFAULT;
break;
}
+ case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
+ u32 __user *uaddr = (u32 __user *)(long)attr->addr;
+
+ r = put_user(dev->kvm->arch.vgic.nr_irqs, uaddr);
+ break;
+ }
+
+ }
+
+ return r;
+}
+
+static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+ int ret;
+
+ ret = vgic_get_common_attr(dev, attr);
+ if (ret != -ENXIO)
+ return ret;
+ switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u32 reg = 0;
- r = vgic_attr_regs_access(dev, attr, ®, false);
- if (r)
- return r;
- r = put_user(reg, uaddr);
- break;
- }
- case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
- u32 __user *uaddr = (u32 __user *)(long)attr->addr;
- r = put_user(dev->kvm->arch.vgic.nr_irqs, uaddr);
- break;
+ ret = vgic_attr_regs_access(dev, attr, ®, false);
+ if (ret)
+ return ret;
+ return put_user(reg, uaddr);
}
}
- return r;
+ return -ENXIO;
}
static int vgic_has_attr_regs(const struct mmio_range *ranges,
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 26/36] arm/arm64: KVM: add vgic.h header file
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (24 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 25/36] arm/arm64: KVM: refactor/wrap vgic_set/get_attr() Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 27/36] arm/arm64: KVM: split GICv2 specific emulation code from vgic.c Christoffer Dall
` (9 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
vgic.c is currently a mixture of generic vGIC emulation code and
functions specific to emulating a GICv2. To ease the addition of
GICv3 later, we create new header file vgic.h, which holds constants
and prototypes of commonly used functions.
Rename some identifiers to avoid name space clutter.
I removed the long-standing comment about using the kvm_io_bus API
to tackle the GIC register ranges, as it wouldn't be a win for us
anymore.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
-------
As the diff isn't always obvious here (and to aid eventual rebases),
here is a list of high-level changes done to the code:
* moved definitions and prototypes from vgic.c to vgic.h:
- VGIC_ADDR_UNDEF
- ACCESS_{READ,WRITE}_*
- vgic_init()
- vgic_update_state()
- vgic_kick_vcpus()
- vgic_get_vmcr()
- vgic_set_vmcr()
- struct mmio_range {} (renamed to struct kvm_mmio_range)
* removed static keyword and exported prototype in vgic.h:
- vgic_bitmap_get_reg()
- vgic_bitmap_set_irq_val()
- vgic_bitmap_get_shared_map()
- vgic_bytemap_get_reg()
- vgic_dist_irq_set_pending()
- vgic_dist_irq_clear_pending()
- vgic_cpu_irq_clear()
- vgic_reg_access()
- handle_mmio_raz_wi()
- vgic_handle_enable_reg()
- vgic_handle_set_pending_reg()
- vgic_handle_clear_pending_reg()
- vgic_handle_cfg_reg()
- vgic_unqueue_irqs()
- find_matching_range() (renamed to vgic_find_range)
- vgic_handle_mmio_range()
- vgic_update_state()
- vgic_get_vmcr()
- vgic_set_vmcr()
- vgic_queue_irq()
- vgic_kick_vcpus()
- vgic_init()
- vgic_v2_init_emulation()
- vgic_has_attr_regs()
- vgic_set_common_attr()
- vgic_get_common_attr()
- vgic_destroy()
- vgic_create()
* moved functions to vgic.h (static inline):
- mmio_data_read()
- mmio_data_write()
- is_in_range()
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
virt/kvm/arm/vgic.c | 151 +++++++++++++++++-----------------------------------
virt/kvm/arm/vgic.h | 120 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 170 insertions(+), 101 deletions(-)
create mode 100644 virt/kvm/arm/vgic.h
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 06073fa..ce6c998 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -75,33 +75,16 @@
* inactive as long as the external input line is held high.
*/
-#define VGIC_ADDR_UNDEF (-1)
-#define IS_VGIC_ADDR_UNDEF(_x) ((_x) == VGIC_ADDR_UNDEF)
+#include "vgic.h"
-#define PRODUCT_ID_KVM 0x4b /* ASCII code K */
-#define IMPLEMENTER_ARM 0x43b
#define GICC_ARCH_VERSION_V2 0x2
-#define ACCESS_READ_VALUE (1 << 0)
-#define ACCESS_READ_RAZ (0 << 0)
-#define ACCESS_READ_MASK(x) ((x) & (1 << 0))
-#define ACCESS_WRITE_IGNORED (0 << 1)
-#define ACCESS_WRITE_SETBIT (1 << 1)
-#define ACCESS_WRITE_CLEARBIT (2 << 1)
-#define ACCESS_WRITE_VALUE (3 << 1)
-#define ACCESS_WRITE_MASK(x) ((x) & (3 << 1))
-
-static int vgic_init(struct kvm *kvm);
static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu);
static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu);
-static void vgic_update_state(struct kvm *kvm);
-static void vgic_kick_vcpus(struct kvm *kvm);
static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi);
static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg);
static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr);
static void vgic_set_lr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc);
-static void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
-static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
static const struct vgic_ops *vgic_ops;
static const struct vgic_params *vgic;
@@ -175,8 +158,7 @@ static unsigned long *u64_to_bitmask(u64 *val)
return (unsigned long *)val;
}
-static u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x,
- int cpuid, u32 offset)
+u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x, int cpuid, u32 offset)
{
offset >>= 2;
if (!offset)
@@ -194,8 +176,8 @@ static int vgic_bitmap_get_irq_val(struct vgic_bitmap *x,
return test_bit(irq - VGIC_NR_PRIVATE_IRQS, x->shared);
}
-static void vgic_bitmap_set_irq_val(struct vgic_bitmap *x, int cpuid,
- int irq, int val)
+void vgic_bitmap_set_irq_val(struct vgic_bitmap *x, int cpuid,
+ int irq, int val)
{
unsigned long *reg;
@@ -217,7 +199,7 @@ static unsigned long *vgic_bitmap_get_cpu_map(struct vgic_bitmap *x, int cpuid)
return x->private + cpuid;
}
-static unsigned long *vgic_bitmap_get_shared_map(struct vgic_bitmap *x)
+unsigned long *vgic_bitmap_get_shared_map(struct vgic_bitmap *x)
{
return x->shared;
}
@@ -244,7 +226,7 @@ static void vgic_free_bytemap(struct vgic_bytemap *b)
b->shared = NULL;
}
-static u32 *vgic_bytemap_get_reg(struct vgic_bytemap *x, int cpuid, u32 offset)
+u32 *vgic_bytemap_get_reg(struct vgic_bytemap *x, int cpuid, u32 offset)
{
u32 *reg;
@@ -341,14 +323,14 @@ static int vgic_dist_irq_is_pending(struct kvm_vcpu *vcpu, int irq)
return vgic_bitmap_get_irq_val(&dist->irq_pending, vcpu->vcpu_id, irq);
}
-static void vgic_dist_irq_set_pending(struct kvm_vcpu *vcpu, int irq)
+void vgic_dist_irq_set_pending(struct kvm_vcpu *vcpu, int irq)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
vgic_bitmap_set_irq_val(&dist->irq_pending, vcpu->vcpu_id, irq, 1);
}
-static void vgic_dist_irq_clear_pending(struct kvm_vcpu *vcpu, int irq)
+void vgic_dist_irq_clear_pending(struct kvm_vcpu *vcpu, int irq)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
@@ -364,7 +346,7 @@ static void vgic_cpu_irq_set(struct kvm_vcpu *vcpu, int irq)
vcpu->arch.vgic_cpu.pending_shared);
}
-static void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
+void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
{
if (irq < VGIC_NR_PRIVATE_IRQS)
clear_bit(irq, vcpu->arch.vgic_cpu.pending_percpu);
@@ -378,16 +360,6 @@ static bool vgic_can_sample_irq(struct kvm_vcpu *vcpu, int irq)
return vgic_irq_is_edge(vcpu, irq) || !vgic_irq_is_queued(vcpu, irq);
}
-static u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
-{
- return le32_to_cpu(*((u32 *)mmio->data)) & mask;
-}
-
-static void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value)
-{
- *((u32 *)mmio->data) = cpu_to_le32(value) & mask;
-}
-
/**
* vgic_reg_access - access vgic register
* @mmio: pointer to the data describing the mmio access
@@ -399,8 +371,8 @@ static void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value)
* modes defined for vgic register access
* (read,raz,write-ignored,setbit,clearbit,write)
*/
-static void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
- phys_addr_t offset, int mode)
+void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
+ phys_addr_t offset, int mode)
{
int word_offset = (offset & 3) * 8;
u32 mask = (1UL << (mmio->len * 8)) - 1;
@@ -484,16 +456,16 @@ static bool handle_mmio_misc(struct kvm_vcpu *vcpu,
return false;
}
-static bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio, phys_addr_t offset)
+bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
{
vgic_reg_access(mmio, NULL, offset,
ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
return false;
}
-static bool vgic_handle_enable_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
- phys_addr_t offset, int vcpu_id, int access)
+bool vgic_handle_enable_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset, int vcpu_id, int access)
{
u32 *reg;
int mode = ACCESS_READ_VALUE | access;
@@ -530,9 +502,9 @@ static bool handle_mmio_clear_enable_reg(struct kvm_vcpu *vcpu,
vcpu->vcpu_id, ACCESS_WRITE_CLEARBIT);
}
-static bool vgic_handle_set_pending_reg(struct kvm *kvm,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset, int vcpu_id)
+bool vgic_handle_set_pending_reg(struct kvm *kvm,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset, int vcpu_id)
{
u32 *reg, orig;
u32 level_mask;
@@ -567,9 +539,9 @@ static bool vgic_handle_set_pending_reg(struct kvm *kvm,
return false;
}
-static bool vgic_handle_clear_pending_reg(struct kvm *kvm,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset, int vcpu_id)
+bool vgic_handle_clear_pending_reg(struct kvm *kvm,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset, int vcpu_id)
{
u32 *level_active;
u32 *reg, orig;
@@ -741,8 +713,8 @@ static u16 vgic_cfg_compress(u32 val)
* LSB is always 0. As such, we only keep the upper bit, and use the
* two above functions to compress/expand the bits
*/
-static bool vgic_handle_cfg_reg(u32 *reg, struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
+bool vgic_handle_cfg_reg(u32 *reg, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
{
u32 val;
@@ -818,7 +790,7 @@ static void vgic_v2_add_sgi_source(struct kvm_vcpu *vcpu, int irq, int source)
* to the distributor but the active state stays in the LRs, because we don't
* track the active state on the distributor side.
*/
-static void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
+void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
int i;
@@ -943,21 +915,7 @@ static bool handle_mmio_sgi_clear(struct kvm_vcpu *vcpu,
return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, false);
}
-/*
- * I would have liked to use the kvm_bus_io_*() API instead, but it
- * cannot cope with banked registers (only the VM pointer is passed
- * around, and we need the vcpu). One of these days, someone please
- * fix it!
- */
-struct mmio_range {
- phys_addr_t base;
- unsigned long len;
- int bits_per_irq;
- bool (*handle_mmio)(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
- phys_addr_t offset);
-};
-
-static const struct mmio_range vgic_dist_ranges[] = {
+static const struct kvm_mmio_range vgic_dist_ranges[] = {
{
.base = GIC_DIST_CTRL,
.len = 12,
@@ -1042,12 +1000,12 @@ static const struct mmio_range vgic_dist_ranges[] = {
{}
};
-static const
-struct mmio_range *find_matching_range(const struct mmio_range *ranges,
+const
+struct kvm_mmio_range *vgic_find_range(const struct kvm_mmio_range *ranges,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
- const struct mmio_range *r = ranges;
+ const struct kvm_mmio_range *r = ranges;
while (r->len) {
if (offset >= r->base &&
@@ -1060,7 +1018,7 @@ struct mmio_range *find_matching_range(const struct mmio_range *ranges,
}
static bool vgic_validate_access(const struct vgic_dist *dist,
- const struct mmio_range *range,
+ const struct kvm_mmio_range *range,
unsigned long offset)
{
int irq;
@@ -1088,7 +1046,7 @@ static bool vgic_validate_access(const struct vgic_dist *dist,
static bool call_range_handler(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
unsigned long offset,
- const struct mmio_range *range)
+ const struct kvm_mmio_range *range)
{
u32 *data32 = (void *)mmio->data;
struct kvm_exit_mmio mmio32;
@@ -1132,18 +1090,18 @@ static bool call_range_handler(struct kvm_vcpu *vcpu,
*
* returns true if the MMIO access could be performed
*/
-static bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
+bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_exit_mmio *mmio,
- const struct mmio_range *ranges,
+ const struct kvm_mmio_range *ranges,
unsigned long mmio_base)
{
- const struct mmio_range *range;
+ const struct kvm_mmio_range *range;
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
bool updated_state;
unsigned long offset;
offset = mmio->phys_addr - mmio_base;
- range = find_matching_range(ranges, mmio, offset);
+ range = vgic_find_range(ranges, mmio, offset);
if (unlikely(!range || !range->handle_mmio)) {
pr_warn("Unhandled access %d %08llx %d\n",
mmio->is_write, mmio->phys_addr, mmio->len);
@@ -1169,12 +1127,6 @@ static bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
return true;
}
-static inline bool is_in_range(phys_addr_t addr, unsigned long len,
- phys_addr_t baseaddr, unsigned long size)
-{
- return (addr >= baseaddr) && (addr + len <= baseaddr + size);
-}
-
static bool vgic_v2_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_exit_mmio *mmio)
{
@@ -1301,7 +1253,7 @@ static int compute_pending_for_cpu(struct kvm_vcpu *vcpu)
* Update the interrupt state and determine which CPUs have pending
* interrupts. Must be called with distributor lock held.
*/
-static void vgic_update_state(struct kvm *kvm)
+void vgic_update_state(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
struct kvm_vcpu *vcpu;
@@ -1362,12 +1314,12 @@ static inline void vgic_disable_underflow(struct kvm_vcpu *vcpu)
vgic_ops->disable_underflow(vcpu);
}
-static inline void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
+void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
{
vgic_ops->get_vmcr(vcpu, vmcr);
}
-static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
+void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
{
vgic_ops->set_vmcr(vcpu, vmcr);
}
@@ -1417,7 +1369,7 @@ static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
* Queue an interrupt to a CPU virtual interface. Return true on success,
* or false if it wasn't possible to queue it.
*/
-static bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
+bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
@@ -1703,7 +1655,7 @@ int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
return test_bit(vcpu->vcpu_id, dist->irq_pending_on_cpu);
}
-static void vgic_kick_vcpus(struct kvm *kvm)
+void vgic_kick_vcpus(struct kvm *kvm)
{
struct kvm_vcpu *vcpu;
int c;
@@ -1956,7 +1908,7 @@ static int vgic_v2_init_model(struct kvm *kvm)
* Allocate and initialize the various data structures. Must be called
* with kvm->lock held!
*/
-static int vgic_init(struct kvm *kvm)
+int vgic_init(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
struct kvm_vcpu *vcpu;
@@ -2096,7 +2048,7 @@ out:
return ret;
}
-static void vgic_v2_init_emulation(struct kvm *kvm)
+void vgic_v2_init_emulation(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
@@ -2326,7 +2278,7 @@ static bool handle_cpu_mmio_ident(struct kvm_vcpu *vcpu,
* CPU Interface Register accesses - these are not accessed by the VM, but by
* user space for saving and restoring VGIC state.
*/
-static const struct mmio_range vgic_cpu_ranges[] = {
+static const struct kvm_mmio_range vgic_cpu_ranges[] = {
{
.base = GIC_CPU_CTRL,
.len = 12,
@@ -2353,7 +2305,7 @@ static int vgic_attr_regs_access(struct kvm_device *dev,
struct kvm_device_attr *attr,
u32 *reg, bool is_write)
{
- const struct mmio_range *r = NULL, *ranges;
+ const struct kvm_mmio_range *r = NULL, *ranges;
phys_addr_t offset;
int ret, cpuid, c;
struct kvm_vcpu *vcpu, *tmp_vcpu;
@@ -2394,7 +2346,7 @@ static int vgic_attr_regs_access(struct kvm_device *dev,
default:
BUG();
}
- r = find_matching_range(ranges, &mmio, offset);
+ r = vgic_find_range(ranges, &mmio, offset);
if (unlikely(!r || !r->handle_mmio)) {
ret = -ENXIO;
@@ -2440,8 +2392,7 @@ out:
return ret;
}
-static int vgic_set_common_attr(struct kvm_device *dev,
- struct kvm_device_attr *attr)
+int vgic_set_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
int r;
@@ -2525,8 +2476,7 @@ static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return -ENXIO;
}
-static int vgic_get_common_attr(struct kvm_device *dev,
- struct kvm_device_attr *attr)
+int vgic_get_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
int r = -ENXIO;
@@ -2581,13 +2531,12 @@ static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return -ENXIO;
}
-static int vgic_has_attr_regs(const struct mmio_range *ranges,
- phys_addr_t offset)
+int vgic_has_attr_regs(const struct kvm_mmio_range *ranges, phys_addr_t offset)
{
struct kvm_exit_mmio dev_attr_mmio;
dev_attr_mmio.len = 4;
- if (find_matching_range(ranges, &dev_attr_mmio, offset))
+ if (vgic_find_range(ranges, &dev_attr_mmio, offset))
return 0;
else
return -ENXIO;
@@ -2622,12 +2571,12 @@ static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return -ENXIO;
}
-static void vgic_destroy(struct kvm_device *dev)
+void vgic_destroy(struct kvm_device *dev)
{
kfree(dev);
}
-static int vgic_create(struct kvm_device *dev, u32 type)
+int vgic_create(struct kvm_device *dev, u32 type)
{
return kvm_vgic_create(dev->kvm, type);
}
diff --git a/virt/kvm/arm/vgic.h b/virt/kvm/arm/vgic.h
new file mode 100644
index 0000000..e363b93
--- /dev/null
+++ b/virt/kvm/arm/vgic.h
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2012-2014 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from virt/kvm/arm/vgic.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __KVM_VGIC_H__
+#define __KVM_VGIC_H__
+
+#define VGIC_ADDR_UNDEF (-1)
+#define IS_VGIC_ADDR_UNDEF(_x) ((_x) == VGIC_ADDR_UNDEF)
+
+#define PRODUCT_ID_KVM 0x4b /* ASCII code K */
+#define IMPLEMENTER_ARM 0x43b
+
+#define ACCESS_READ_VALUE (1 << 0)
+#define ACCESS_READ_RAZ (0 << 0)
+#define ACCESS_READ_MASK(x) ((x) & (1 << 0))
+#define ACCESS_WRITE_IGNORED (0 << 1)
+#define ACCESS_WRITE_SETBIT (1 << 1)
+#define ACCESS_WRITE_CLEARBIT (2 << 1)
+#define ACCESS_WRITE_VALUE (3 << 1)
+#define ACCESS_WRITE_MASK(x) ((x) & (3 << 1))
+
+unsigned long *vgic_bitmap_get_shared_map(struct vgic_bitmap *x);
+
+void vgic_update_state(struct kvm *kvm);
+int vgic_init_common_maps(struct kvm *kvm);
+
+u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x, int cpuid, u32 offset);
+u32 *vgic_bytemap_get_reg(struct vgic_bytemap *x, int cpuid, u32 offset);
+
+void vgic_dist_irq_set_pending(struct kvm_vcpu *vcpu, int irq);
+void vgic_dist_irq_clear_pending(struct kvm_vcpu *vcpu, int irq);
+void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq);
+void vgic_bitmap_set_irq_val(struct vgic_bitmap *x, int cpuid,
+ int irq, int val);
+
+void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+
+bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq);
+void vgic_unqueue_irqs(struct kvm_vcpu *vcpu);
+
+void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
+ phys_addr_t offset, int mode);
+bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset);
+
+static inline
+u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
+{
+ return le32_to_cpu(*((u32 *)mmio->data)) & mask;
+}
+
+static inline
+void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value)
+{
+ *((u32 *)mmio->data) = cpu_to_le32(value) & mask;
+}
+
+struct kvm_mmio_range {
+ phys_addr_t base;
+ unsigned long len;
+ int bits_per_irq;
+ bool (*handle_mmio)(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset);
+};
+
+static inline bool is_in_range(phys_addr_t addr, unsigned long len,
+ phys_addr_t baseaddr, unsigned long size)
+{
+ return (addr >= baseaddr) && (addr + len <= baseaddr + size);
+}
+
+const
+struct kvm_mmio_range *vgic_find_range(const struct kvm_mmio_range *ranges,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset);
+
+bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ struct kvm_exit_mmio *mmio,
+ const struct kvm_mmio_range *ranges,
+ unsigned long mmio_base);
+
+bool vgic_handle_enable_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset, int vcpu_id, int access);
+
+bool vgic_handle_set_pending_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset, int vcpu_id);
+
+bool vgic_handle_clear_pending_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset, int vcpu_id);
+
+bool vgic_handle_cfg_reg(u32 *reg, struct kvm_exit_mmio *mmio,
+ phys_addr_t offset);
+
+void vgic_kick_vcpus(struct kvm *kvm);
+
+int vgic_has_attr_regs(const struct kvm_mmio_range *ranges, phys_addr_t offset);
+int vgic_set_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr);
+int vgic_get_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr);
+
+int vgic_init(struct kvm *kvm);
+void vgic_v2_init_emulation(struct kvm *kvm);
+
+#endif
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 27/36] arm/arm64: KVM: split GICv2 specific emulation code from vgic.c
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (25 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 26/36] arm/arm64: KVM: add vgic.h header file Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 28/36] arm/arm64: KVM: add opaque private pointer to MMIO data Christoffer Dall
` (8 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
vgic.c is currently a mixture of generic vGIC emulation code and
functions specific to emulating a GICv2. To ease the addition of
GICv3, split off strictly v2 specific parts into a new file
vgic-v2-emul.c.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
-------
As the diff isn't always obvious here (and to aid eventual rebases),
here is a list of high-level changes done to the code:
* added new file to respective arm/arm64 Makefiles
* moved GICv2 specific functions to vgic-v2-emul.c:
- handle_mmio_misc()
- handle_mmio_set_enable_reg()
- handle_mmio_clear_enable_reg()
- handle_mmio_set_pending_reg()
- handle_mmio_clear_pending_reg()
- handle_mmio_priority_reg()
- vgic_get_target_reg()
- vgic_set_target_reg()
- handle_mmio_target_reg()
- handle_mmio_cfg_reg()
- handle_mmio_sgi_reg()
- vgic_v2_unqueue_sgi()
- read_set_clear_sgi_pend_reg()
- write_set_clear_sgi_pend_reg()
- handle_mmio_sgi_set()
- handle_mmio_sgi_clear()
- vgic_v2_handle_mmio()
- vgic_get_sgi_sources()
- vgic_dispatch_sgi()
- vgic_v2_queue_sgi()
- vgic_v2_map_resources()
- vgic_v2_init()
- vgic_v2_add_sgi_source()
- vgic_v2_init_model()
- vgic_v2_init_emulation()
- handle_cpu_mmio_misc()
- handle_mmio_abpr()
- handle_cpu_mmio_ident()
- vgic_attr_regs_access()
- vgic_create() (renamed to vgic_v2_create())
- vgic_destroy() (renamed to vgic_v2_destroy())
- vgic_has_attr() (renamed to vgic_v2_has_attr())
- vgic_set_attr() (renamed to vgic_v2_set_attr())
- vgic_get_attr() (renamed to vgic_v2_get_attr())
- struct kvm_mmio_range vgic_dist_ranges[]
- struct kvm_mmio_range vgic_cpu_ranges[]
- struct kvm_device_ops kvm_arm_vgic_v2_ops {}
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm/kvm/Makefile | 1 +
arch/arm64/kvm/Makefile | 1 +
virt/kvm/arm/vgic-v2-emul.c | 847 ++++++++++++++++++++++++++++++++++++++++++++
virt/kvm/arm/vgic.c | 806 +----------------------------------------
4 files changed, 850 insertions(+), 805 deletions(-)
create mode 100644 virt/kvm/arm/vgic-v2-emul.c
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index f7057ed..443b8be 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -22,4 +22,5 @@ obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o
obj-y += coproc.o coproc_a15.o coproc_a7.o mmio.o psci.o perf.o
obj-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic.o
obj-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v2.o
+obj-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v2-emul.o
obj-$(CONFIG_KVM_ARM_TIMER) += $(KVM)/arm/arch_timer.o
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index 32a0961..d957353 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -21,6 +21,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += guest.o reset.o sys_regs.o sys_regs_generic_v8.o
kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic.o
kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v2.o
+kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v2-emul.o
kvm-$(CONFIG_KVM_ARM_VGIC) += vgic-v2-switch.o
kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v3.o
kvm-$(CONFIG_KVM_ARM_VGIC) += vgic-v3-switch.o
diff --git a/virt/kvm/arm/vgic-v2-emul.c b/virt/kvm/arm/vgic-v2-emul.c
new file mode 100644
index 0000000..19c6210
--- /dev/null
+++ b/virt/kvm/arm/vgic-v2-emul.c
@@ -0,0 +1,847 @@
+/*
+ * Contains GICv2 specific emulation code, was in vgic.c before.
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/cpu.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <linux/irqchip/arm-gic.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+
+#include "vgic.h"
+
+#define GICC_ARCH_VERSION_V2 0x2
+
+static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg);
+static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi)
+{
+ return dist->irq_sgi_sources + vcpu_id * VGIC_NR_SGIS + sgi;
+}
+
+static bool handle_mmio_misc(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ u32 reg;
+ u32 word_offset = offset & 3;
+
+ switch (offset & ~3) {
+ case 0: /* GICD_CTLR */
+ reg = vcpu->kvm->arch.vgic.enabled;
+ vgic_reg_access(mmio, ®, word_offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+ if (mmio->is_write) {
+ vcpu->kvm->arch.vgic.enabled = reg & 1;
+ vgic_update_state(vcpu->kvm);
+ return true;
+ }
+ break;
+
+ case 4: /* GICD_TYPER */
+ reg = (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
+ reg |= (vcpu->kvm->arch.vgic.nr_irqs >> 5) - 1;
+ vgic_reg_access(mmio, ®, word_offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+ break;
+
+ case 8: /* GICD_IIDR */
+ reg = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
+ vgic_reg_access(mmio, ®, word_offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+ break;
+ }
+
+ return false;
+}
+
+static bool handle_mmio_set_enable_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id, ACCESS_WRITE_SETBIT);
+}
+
+static bool handle_mmio_clear_enable_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id, ACCESS_WRITE_CLEARBIT);
+}
+
+static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ return vgic_handle_set_pending_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id);
+}
+
+static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ return vgic_handle_clear_pending_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id);
+}
+
+static bool handle_mmio_priority_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ u32 *reg = vgic_bytemap_get_reg(&vcpu->kvm->arch.vgic.irq_priority,
+ vcpu->vcpu_id, offset);
+ vgic_reg_access(mmio, reg, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+ return false;
+}
+
+#define GICD_ITARGETSR_SIZE 32
+#define GICD_CPUTARGETS_BITS 8
+#define GICD_IRQS_PER_ITARGETSR (GICD_ITARGETSR_SIZE / GICD_CPUTARGETS_BITS)
+static u32 vgic_get_target_reg(struct kvm *kvm, int irq)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ int i;
+ u32 val = 0;
+
+ irq -= VGIC_NR_PRIVATE_IRQS;
+
+ for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++)
+ val |= 1 << (dist->irq_spi_cpu[irq + i] + i * 8);
+
+ return val;
+}
+
+static void vgic_set_target_reg(struct kvm *kvm, u32 val, int irq)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ struct kvm_vcpu *vcpu;
+ int i, c;
+ unsigned long *bmap;
+ u32 target;
+
+ irq -= VGIC_NR_PRIVATE_IRQS;
+
+ /*
+ * Pick the LSB in each byte. This ensures we target exactly
+ * one vcpu per IRQ. If the byte is null, assume we target
+ * CPU0.
+ */
+ for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++) {
+ int shift = i * GICD_CPUTARGETS_BITS;
+
+ target = ffs((val >> shift) & 0xffU);
+ target = target ? (target - 1) : 0;
+ dist->irq_spi_cpu[irq + i] = target;
+ kvm_for_each_vcpu(c, vcpu, kvm) {
+ bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[c]);
+ if (c == target)
+ set_bit(irq + i, bmap);
+ else
+ clear_bit(irq + i, bmap);
+ }
+ }
+}
+
+static bool handle_mmio_target_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ u32 reg;
+
+ /* We treat the banked interrupts targets as read-only */
+ if (offset < 32) {
+ u32 roreg;
+
+ roreg = 1 << vcpu->vcpu_id;
+ roreg |= roreg << 8;
+ roreg |= roreg << 16;
+
+ vgic_reg_access(mmio, &roreg, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+ return false;
+ }
+
+ reg = vgic_get_target_reg(vcpu->kvm, offset & ~3U);
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+ if (mmio->is_write) {
+ vgic_set_target_reg(vcpu->kvm, reg, offset & ~3U);
+ vgic_update_state(vcpu->kvm);
+ return true;
+ }
+
+ return false;
+}
+
+static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ u32 *reg;
+
+ reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
+ vcpu->vcpu_id, offset >> 1);
+
+ return vgic_handle_cfg_reg(reg, mmio, offset);
+}
+
+static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ u32 reg;
+
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_VALUE);
+ if (mmio->is_write) {
+ vgic_dispatch_sgi(vcpu, reg);
+ vgic_update_state(vcpu->kvm);
+ return true;
+ }
+
+ return false;
+}
+
+/* Handle reads of GICD_CPENDSGIRn and GICD_SPENDSGIRn */
+static bool read_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ int sgi;
+ int min_sgi = (offset & ~0x3);
+ int max_sgi = min_sgi + 3;
+ int vcpu_id = vcpu->vcpu_id;
+ u32 reg = 0;
+
+ /* Copy source SGIs from distributor side */
+ for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
+ u8 sources = *vgic_get_sgi_sources(dist, vcpu_id, sgi);
+
+ reg |= ((u32)sources) << (8 * (sgi - min_sgi));
+ }
+
+ mmio_data_write(mmio, ~0, reg);
+ return false;
+}
+
+static bool write_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset, bool set)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ int sgi;
+ int min_sgi = (offset & ~0x3);
+ int max_sgi = min_sgi + 3;
+ int vcpu_id = vcpu->vcpu_id;
+ u32 reg;
+ bool updated = false;
+
+ reg = mmio_data_read(mmio, ~0);
+
+ /* Clear pending SGIs on the distributor */
+ for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
+ u8 mask = reg >> (8 * (sgi - min_sgi));
+ u8 *src = vgic_get_sgi_sources(dist, vcpu_id, sgi);
+
+ if (set) {
+ if ((*src & mask) != mask)
+ updated = true;
+ *src |= mask;
+ } else {
+ if (*src & mask)
+ updated = true;
+ *src &= ~mask;
+ }
+ }
+
+ if (updated)
+ vgic_update_state(vcpu->kvm);
+
+ return updated;
+}
+
+static bool handle_mmio_sgi_set(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ if (!mmio->is_write)
+ return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
+ else
+ return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, true);
+}
+
+static bool handle_mmio_sgi_clear(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ if (!mmio->is_write)
+ return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
+ else
+ return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, false);
+}
+
+static const struct kvm_mmio_range vgic_dist_ranges[] = {
+ {
+ .base = GIC_DIST_CTRL,
+ .len = 12,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_misc,
+ },
+ {
+ .base = GIC_DIST_IGROUP,
+ .len = VGIC_MAX_IRQS / 8,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GIC_DIST_ENABLE_SET,
+ .len = VGIC_MAX_IRQS / 8,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_set_enable_reg,
+ },
+ {
+ .base = GIC_DIST_ENABLE_CLEAR,
+ .len = VGIC_MAX_IRQS / 8,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_clear_enable_reg,
+ },
+ {
+ .base = GIC_DIST_PENDING_SET,
+ .len = VGIC_MAX_IRQS / 8,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_set_pending_reg,
+ },
+ {
+ .base = GIC_DIST_PENDING_CLEAR,
+ .len = VGIC_MAX_IRQS / 8,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_clear_pending_reg,
+ },
+ {
+ .base = GIC_DIST_ACTIVE_SET,
+ .len = VGIC_MAX_IRQS / 8,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GIC_DIST_ACTIVE_CLEAR,
+ .len = VGIC_MAX_IRQS / 8,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GIC_DIST_PRI,
+ .len = VGIC_MAX_IRQS,
+ .bits_per_irq = 8,
+ .handle_mmio = handle_mmio_priority_reg,
+ },
+ {
+ .base = GIC_DIST_TARGET,
+ .len = VGIC_MAX_IRQS,
+ .bits_per_irq = 8,
+ .handle_mmio = handle_mmio_target_reg,
+ },
+ {
+ .base = GIC_DIST_CONFIG,
+ .len = VGIC_MAX_IRQS / 4,
+ .bits_per_irq = 2,
+ .handle_mmio = handle_mmio_cfg_reg,
+ },
+ {
+ .base = GIC_DIST_SOFTINT,
+ .len = 4,
+ .handle_mmio = handle_mmio_sgi_reg,
+ },
+ {
+ .base = GIC_DIST_SGI_PENDING_CLEAR,
+ .len = VGIC_NR_SGIS,
+ .handle_mmio = handle_mmio_sgi_clear,
+ },
+ {
+ .base = GIC_DIST_SGI_PENDING_SET,
+ .len = VGIC_NR_SGIS,
+ .handle_mmio = handle_mmio_sgi_set,
+ },
+ {}
+};
+
+static bool vgic_v2_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ struct kvm_exit_mmio *mmio)
+{
+ unsigned long base = vcpu->kvm->arch.vgic.vgic_dist_base;
+
+ if (!is_in_range(mmio->phys_addr, mmio->len, base,
+ KVM_VGIC_V2_DIST_SIZE))
+ return false;
+
+ /* GICv2 does not support accesses wider than 32 bits */
+ if (mmio->len > 4) {
+ kvm_inject_dabt(vcpu, mmio->phys_addr);
+ return true;
+ }
+
+ return vgic_handle_mmio_range(vcpu, run, mmio, vgic_dist_ranges, base);
+}
+
+static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ int nrcpus = atomic_read(&kvm->online_vcpus);
+ u8 target_cpus;
+ int sgi, mode, c, vcpu_id;
+
+ vcpu_id = vcpu->vcpu_id;
+
+ sgi = reg & 0xf;
+ target_cpus = (reg >> 16) & 0xff;
+ mode = (reg >> 24) & 3;
+
+ switch (mode) {
+ case 0:
+ if (!target_cpus)
+ return;
+ break;
+
+ case 1:
+ target_cpus = ((1 << nrcpus) - 1) & ~(1 << vcpu_id) & 0xff;
+ break;
+
+ case 2:
+ target_cpus = 1 << vcpu_id;
+ break;
+ }
+
+ kvm_for_each_vcpu(c, vcpu, kvm) {
+ if (target_cpus & 1) {
+ /* Flag the SGI as pending */
+ vgic_dist_irq_set_pending(vcpu, sgi);
+ *vgic_get_sgi_sources(dist, c, sgi) |= 1 << vcpu_id;
+ kvm_debug("SGI%d from CPU%d to CPU%d\n",
+ sgi, vcpu_id, c);
+ }
+
+ target_cpus >>= 1;
+ }
+}
+
+static bool vgic_v2_queue_sgi(struct kvm_vcpu *vcpu, int irq)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ unsigned long sources;
+ int vcpu_id = vcpu->vcpu_id;
+ int c;
+
+ sources = *vgic_get_sgi_sources(dist, vcpu_id, irq);
+
+ for_each_set_bit(c, &sources, dist->nr_cpus) {
+ if (vgic_queue_irq(vcpu, c, irq))
+ clear_bit(c, &sources);
+ }
+
+ *vgic_get_sgi_sources(dist, vcpu_id, irq) = sources;
+
+ /*
+ * If the sources bitmap has been cleared it means that we
+ * could queue all the SGIs onto link registers (see the
+ * clear_bit above), and therefore we are done with them in
+ * our emulated gic and can get rid of them.
+ */
+ if (!sources) {
+ vgic_dist_irq_clear_pending(vcpu, irq);
+ vgic_cpu_irq_clear(vcpu, irq);
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * kvm_vgic_map_resources - Configure global VGIC state before running any VCPUs
+ * @kvm: pointer to the kvm struct
+ *
+ * Map the virtual CPU interface into the VM before running any VCPUs. We
+ * can't do this at creation time, because user space must first set the
+ * virtual CPU interface address in the guest physical address space.
+ */
+static int vgic_v2_map_resources(struct kvm *kvm,
+ const struct vgic_params *params)
+{
+ int ret = 0;
+
+ if (!irqchip_in_kernel(kvm))
+ return 0;
+
+ mutex_lock(&kvm->lock);
+
+ if (vgic_ready(kvm))
+ goto out;
+
+ if (IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_dist_base) ||
+ IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_cpu_base)) {
+ kvm_err("Need to set vgic cpu and dist addresses first\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ /*
+ * Initialize the vgic if this hasn't already been done on demand by
+ * accessing the vgic state from userspace.
+ */
+ ret = vgic_init(kvm);
+ if (ret) {
+ kvm_err("Unable to allocate maps\n");
+ goto out;
+ }
+
+ ret = kvm_phys_addr_ioremap(kvm, kvm->arch.vgic.vgic_cpu_base,
+ params->vcpu_base, KVM_VGIC_V2_CPU_SIZE,
+ true);
+ if (ret) {
+ kvm_err("Unable to remap VGIC CPU to VCPU\n");
+ goto out;
+ }
+
+ kvm->arch.vgic.ready = true;
+out:
+ if (ret)
+ kvm_vgic_destroy(kvm);
+ mutex_unlock(&kvm->lock);
+ return ret;
+}
+
+static void vgic_v2_add_sgi_source(struct kvm_vcpu *vcpu, int irq, int source)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+ *vgic_get_sgi_sources(dist, vcpu->vcpu_id, irq) |= 1 << source;
+}
+
+static int vgic_v2_init_model(struct kvm *kvm)
+{
+ int i;
+
+ for (i = VGIC_NR_PRIVATE_IRQS; i < kvm->arch.vgic.nr_irqs; i += 4)
+ vgic_set_target_reg(kvm, 0, i);
+
+ return 0;
+}
+
+void vgic_v2_init_emulation(struct kvm *kvm)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+
+ dist->vm_ops.handle_mmio = vgic_v2_handle_mmio;
+ dist->vm_ops.queue_sgi = vgic_v2_queue_sgi;
+ dist->vm_ops.add_sgi_source = vgic_v2_add_sgi_source;
+ dist->vm_ops.init_model = vgic_v2_init_model;
+ dist->vm_ops.map_resources = vgic_v2_map_resources;
+
+ kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
+}
+
+static bool handle_cpu_mmio_misc(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ bool updated = false;
+ struct vgic_vmcr vmcr;
+ u32 *vmcr_field;
+ u32 reg;
+
+ vgic_get_vmcr(vcpu, &vmcr);
+
+ switch (offset & ~0x3) {
+ case GIC_CPU_CTRL:
+ vmcr_field = &vmcr.ctlr;
+ break;
+ case GIC_CPU_PRIMASK:
+ vmcr_field = &vmcr.pmr;
+ break;
+ case GIC_CPU_BINPOINT:
+ vmcr_field = &vmcr.bpr;
+ break;
+ case GIC_CPU_ALIAS_BINPOINT:
+ vmcr_field = &vmcr.abpr;
+ break;
+ default:
+ BUG();
+ }
+
+ if (!mmio->is_write) {
+ reg = *vmcr_field;
+ mmio_data_write(mmio, ~0, reg);
+ } else {
+ reg = mmio_data_read(mmio, ~0);
+ if (reg != *vmcr_field) {
+ *vmcr_field = reg;
+ vgic_set_vmcr(vcpu, &vmcr);
+ updated = true;
+ }
+ }
+ return updated;
+}
+
+static bool handle_mmio_abpr(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ return handle_cpu_mmio_misc(vcpu, mmio, GIC_CPU_ALIAS_BINPOINT);
+}
+
+static bool handle_cpu_mmio_ident(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ u32 reg;
+
+ if (mmio->is_write)
+ return false;
+
+ /* GICC_IIDR */
+ reg = (PRODUCT_ID_KVM << 20) |
+ (GICC_ARCH_VERSION_V2 << 16) |
+ (IMPLEMENTER_ARM << 0);
+ mmio_data_write(mmio, ~0, reg);
+ return false;
+}
+
+/*
+ * CPU Interface Register accesses - these are not accessed by the VM, but by
+ * user space for saving and restoring VGIC state.
+ */
+static const struct kvm_mmio_range vgic_cpu_ranges[] = {
+ {
+ .base = GIC_CPU_CTRL,
+ .len = 12,
+ .handle_mmio = handle_cpu_mmio_misc,
+ },
+ {
+ .base = GIC_CPU_ALIAS_BINPOINT,
+ .len = 4,
+ .handle_mmio = handle_mmio_abpr,
+ },
+ {
+ .base = GIC_CPU_ACTIVEPRIO,
+ .len = 16,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GIC_CPU_IDENT,
+ .len = 4,
+ .handle_mmio = handle_cpu_mmio_ident,
+ },
+};
+
+static int vgic_attr_regs_access(struct kvm_device *dev,
+ struct kvm_device_attr *attr,
+ u32 *reg, bool is_write)
+{
+ const struct kvm_mmio_range *r = NULL, *ranges;
+ phys_addr_t offset;
+ int ret, cpuid, c;
+ struct kvm_vcpu *vcpu, *tmp_vcpu;
+ struct vgic_dist *vgic;
+ struct kvm_exit_mmio mmio;
+
+ offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
+ cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >>
+ KVM_DEV_ARM_VGIC_CPUID_SHIFT;
+
+ mutex_lock(&dev->kvm->lock);
+
+ ret = vgic_init(dev->kvm);
+ if (ret)
+ goto out;
+
+ if (cpuid >= atomic_read(&dev->kvm->online_vcpus)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ vcpu = kvm_get_vcpu(dev->kvm, cpuid);
+ vgic = &dev->kvm->arch.vgic;
+
+ mmio.len = 4;
+ mmio.is_write = is_write;
+ if (is_write)
+ mmio_data_write(&mmio, ~0, *reg);
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+ mmio.phys_addr = vgic->vgic_dist_base + offset;
+ ranges = vgic_dist_ranges;
+ break;
+ case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+ mmio.phys_addr = vgic->vgic_cpu_base + offset;
+ ranges = vgic_cpu_ranges;
+ break;
+ default:
+ BUG();
+ }
+ r = vgic_find_range(ranges, &mmio, offset);
+
+ if (unlikely(!r || !r->handle_mmio)) {
+ ret = -ENXIO;
+ goto out;
+ }
+
+
+ spin_lock(&vgic->lock);
+
+ /*
+ * Ensure that no other VCPU is running by checking the vcpu->cpu
+ * field. If no other VPCUs are running we can safely access the VGIC
+ * state, because even if another VPU is run after this point, that
+ * VCPU will not touch the vgic state, because it will block on
+ * getting the vgic->lock in kvm_vgic_sync_hwstate().
+ */
+ kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm) {
+ if (unlikely(tmp_vcpu->cpu != -1)) {
+ ret = -EBUSY;
+ goto out_vgic_unlock;
+ }
+ }
+
+ /*
+ * Move all pending IRQs from the LRs on all VCPUs so the pending
+ * state can be properly represented in the register state accessible
+ * through this API.
+ */
+ kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm)
+ vgic_unqueue_irqs(tmp_vcpu);
+
+ offset -= r->base;
+ r->handle_mmio(vcpu, &mmio, offset);
+
+ if (!is_write)
+ *reg = mmio_data_read(&mmio, ~0);
+
+ ret = 0;
+out_vgic_unlock:
+ spin_unlock(&vgic->lock);
+out:
+ mutex_unlock(&dev->kvm->lock);
+ return ret;
+}
+
+static int vgic_v2_create(struct kvm_device *dev, u32 type)
+{
+ return kvm_vgic_create(dev->kvm, type);
+}
+
+static void vgic_v2_destroy(struct kvm_device *dev)
+{
+ kfree(dev);
+}
+
+static int vgic_v2_set_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ int ret;
+
+ ret = vgic_set_common_attr(dev, attr);
+ if (ret != -ENXIO)
+ return ret;
+
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+ case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
+ u32 __user *uaddr = (u32 __user *)(long)attr->addr;
+ u32 reg;
+
+ if (get_user(reg, uaddr))
+ return -EFAULT;
+
+ return vgic_attr_regs_access(dev, attr, ®, true);
+ }
+
+ }
+
+ return -ENXIO;
+}
+
+static int vgic_v2_get_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ int ret;
+
+ ret = vgic_get_common_attr(dev, attr);
+ if (ret != -ENXIO)
+ return ret;
+
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+ case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
+ u32 __user *uaddr = (u32 __user *)(long)attr->addr;
+ u32 reg = 0;
+
+ ret = vgic_attr_regs_access(dev, attr, ®, false);
+ if (ret)
+ return ret;
+ return put_user(reg, uaddr);
+ }
+
+ }
+
+ return -ENXIO;
+}
+
+static int vgic_v2_has_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ phys_addr_t offset;
+
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_ADDR:
+ switch (attr->attr) {
+ case KVM_VGIC_V2_ADDR_TYPE_DIST:
+ case KVM_VGIC_V2_ADDR_TYPE_CPU:
+ return 0;
+ }
+ break;
+ case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+ offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
+ return vgic_has_attr_regs(vgic_dist_ranges, offset);
+ case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+ offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
+ return vgic_has_attr_regs(vgic_cpu_ranges, offset);
+ case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
+ return 0;
+ case KVM_DEV_ARM_VGIC_GRP_CTRL:
+ switch (attr->attr) {
+ case KVM_DEV_ARM_VGIC_CTRL_INIT:
+ return 0;
+ }
+ }
+ return -ENXIO;
+}
+
+struct kvm_device_ops kvm_arm_vgic_v2_ops = {
+ .name = "kvm-arm-vgic-v2",
+ .create = vgic_v2_create,
+ .destroy = vgic_v2_destroy,
+ .set_attr = vgic_v2_set_attr,
+ .get_attr = vgic_v2_get_attr,
+ .has_attr = vgic_v2_has_attr,
+};
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index ce6c998..0e84292 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -77,12 +77,8 @@
#include "vgic.h"
-#define GICC_ARCH_VERSION_V2 0x2
-
static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu);
static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu);
-static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi);
-static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg);
static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr);
static void vgic_set_lr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc);
@@ -421,41 +417,6 @@ void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
}
}
-static bool handle_mmio_misc(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio, phys_addr_t offset)
-{
- u32 reg;
- u32 word_offset = offset & 3;
-
- switch (offset & ~3) {
- case 0: /* GICD_CTLR */
- reg = vcpu->kvm->arch.vgic.enabled;
- vgic_reg_access(mmio, ®, word_offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
- if (mmio->is_write) {
- vcpu->kvm->arch.vgic.enabled = reg & 1;
- vgic_update_state(vcpu->kvm);
- return true;
- }
- break;
-
- case 4: /* GICD_TYPER */
- reg = (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
- reg |= (vcpu->kvm->arch.vgic.nr_irqs >> 5) - 1;
- vgic_reg_access(mmio, ®, word_offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
- break;
-
- case 8: /* GICD_IIDR */
- reg = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
- vgic_reg_access(mmio, ®, word_offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
- break;
- }
-
- return false;
-}
-
bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
@@ -486,22 +447,6 @@ bool vgic_handle_enable_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
return false;
}
-static bool handle_mmio_set_enable_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
- vcpu->vcpu_id, ACCESS_WRITE_SETBIT);
-}
-
-static bool handle_mmio_clear_enable_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
- vcpu->vcpu_id, ACCESS_WRITE_CLEARBIT);
-}
-
bool vgic_handle_set_pending_reg(struct kvm *kvm,
struct kvm_exit_mmio *mmio,
phys_addr_t offset, int vcpu_id)
@@ -575,109 +520,6 @@ bool vgic_handle_clear_pending_reg(struct kvm *kvm,
return false;
}
-static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- return vgic_handle_set_pending_reg(vcpu->kvm, mmio, offset,
- vcpu->vcpu_id);
-}
-
-static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- return vgic_handle_clear_pending_reg(vcpu->kvm, mmio, offset,
- vcpu->vcpu_id);
-}
-
-static bool handle_mmio_priority_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- u32 *reg = vgic_bytemap_get_reg(&vcpu->kvm->arch.vgic.irq_priority,
- vcpu->vcpu_id, offset);
- vgic_reg_access(mmio, reg, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
- return false;
-}
-
-#define GICD_ITARGETSR_SIZE 32
-#define GICD_CPUTARGETS_BITS 8
-#define GICD_IRQS_PER_ITARGETSR (GICD_ITARGETSR_SIZE / GICD_CPUTARGETS_BITS)
-static u32 vgic_get_target_reg(struct kvm *kvm, int irq)
-{
- struct vgic_dist *dist = &kvm->arch.vgic;
- int i;
- u32 val = 0;
-
- irq -= VGIC_NR_PRIVATE_IRQS;
-
- for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++)
- val |= 1 << (dist->irq_spi_cpu[irq + i] + i * 8);
-
- return val;
-}
-
-static void vgic_set_target_reg(struct kvm *kvm, u32 val, int irq)
-{
- struct vgic_dist *dist = &kvm->arch.vgic;
- struct kvm_vcpu *vcpu;
- int i, c;
- unsigned long *bmap;
- u32 target;
-
- irq -= VGIC_NR_PRIVATE_IRQS;
-
- /*
- * Pick the LSB in each byte. This ensures we target exactly
- * one vcpu per IRQ. If the byte is null, assume we target
- * CPU0.
- */
- for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++) {
- int shift = i * GICD_CPUTARGETS_BITS;
- target = ffs((val >> shift) & 0xffU);
- target = target ? (target - 1) : 0;
- dist->irq_spi_cpu[irq + i] = target;
- kvm_for_each_vcpu(c, vcpu, kvm) {
- bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[c]);
- if (c == target)
- set_bit(irq + i, bmap);
- else
- clear_bit(irq + i, bmap);
- }
- }
-}
-
-static bool handle_mmio_target_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- u32 reg;
-
- /* We treat the banked interrupts targets as read-only */
- if (offset < 32) {
- u32 roreg = 1 << vcpu->vcpu_id;
- roreg |= roreg << 8;
- roreg |= roreg << 16;
-
- vgic_reg_access(mmio, &roreg, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
- return false;
- }
-
- reg = vgic_get_target_reg(vcpu->kvm, offset & ~3U);
- vgic_reg_access(mmio, ®, offset,
- ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
- if (mmio->is_write) {
- vgic_set_target_reg(vcpu->kvm, reg, offset & ~3U);
- vgic_update_state(vcpu->kvm);
- return true;
- }
-
- return false;
-}
-
static u32 vgic_cfg_expand(u16 val)
{
u32 res = 0;
@@ -745,39 +587,6 @@ bool vgic_handle_cfg_reg(u32 *reg, struct kvm_exit_mmio *mmio,
return false;
}
-static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio, phys_addr_t offset)
-{
- u32 *reg;
-
- reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
- vcpu->vcpu_id, offset >> 1);
-
- return vgic_handle_cfg_reg(reg, mmio, offset);
-}
-
-static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio, phys_addr_t offset)
-{
- u32 reg;
- vgic_reg_access(mmio, ®, offset,
- ACCESS_READ_RAZ | ACCESS_WRITE_VALUE);
- if (mmio->is_write) {
- vgic_dispatch_sgi(vcpu, reg);
- vgic_update_state(vcpu->kvm);
- return true;
- }
-
- return false;
-}
-
-static void vgic_v2_add_sgi_source(struct kvm_vcpu *vcpu, int irq, int source)
-{
- struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
-
- *vgic_get_sgi_sources(dist, vcpu->vcpu_id, irq) |= 1 << source;
-}
-
/**
* vgic_unqueue_irqs - move pending IRQs from LRs to the distributor
* @vgic_cpu: Pointer to the vgic_cpu struct holding the LRs
@@ -838,168 +647,6 @@ void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
}
}
-/* Handle reads of GICD_CPENDSGIRn and GICD_SPENDSGIRn */
-static bool read_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- int sgi;
- int min_sgi = (offset & ~0x3);
- int max_sgi = min_sgi + 3;
- int vcpu_id = vcpu->vcpu_id;
- u32 reg = 0;
-
- /* Copy source SGIs from distributor side */
- for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
- int shift = 8 * (sgi - min_sgi);
- reg |= ((u32)*vgic_get_sgi_sources(dist, vcpu_id, sgi)) << shift;
- }
-
- mmio_data_write(mmio, ~0, reg);
- return false;
-}
-
-static bool write_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset, bool set)
-{
- struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- int sgi;
- int min_sgi = (offset & ~0x3);
- int max_sgi = min_sgi + 3;
- int vcpu_id = vcpu->vcpu_id;
- u32 reg;
- bool updated = false;
-
- reg = mmio_data_read(mmio, ~0);
-
- /* Clear pending SGIs on the distributor */
- for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
- u8 mask = reg >> (8 * (sgi - min_sgi));
- u8 *src = vgic_get_sgi_sources(dist, vcpu_id, sgi);
- if (set) {
- if ((*src & mask) != mask)
- updated = true;
- *src |= mask;
- } else {
- if (*src & mask)
- updated = true;
- *src &= ~mask;
- }
- }
-
- if (updated)
- vgic_update_state(vcpu->kvm);
-
- return updated;
-}
-
-static bool handle_mmio_sgi_set(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- if (!mmio->is_write)
- return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
- else
- return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, true);
-}
-
-static bool handle_mmio_sgi_clear(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- if (!mmio->is_write)
- return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
- else
- return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, false);
-}
-
-static const struct kvm_mmio_range vgic_dist_ranges[] = {
- {
- .base = GIC_DIST_CTRL,
- .len = 12,
- .bits_per_irq = 0,
- .handle_mmio = handle_mmio_misc,
- },
- {
- .base = GIC_DIST_IGROUP,
- .len = VGIC_MAX_IRQS / 8,
- .bits_per_irq = 1,
- .handle_mmio = handle_mmio_raz_wi,
- },
- {
- .base = GIC_DIST_ENABLE_SET,
- .len = VGIC_MAX_IRQS / 8,
- .bits_per_irq = 1,
- .handle_mmio = handle_mmio_set_enable_reg,
- },
- {
- .base = GIC_DIST_ENABLE_CLEAR,
- .len = VGIC_MAX_IRQS / 8,
- .bits_per_irq = 1,
- .handle_mmio = handle_mmio_clear_enable_reg,
- },
- {
- .base = GIC_DIST_PENDING_SET,
- .len = VGIC_MAX_IRQS / 8,
- .bits_per_irq = 1,
- .handle_mmio = handle_mmio_set_pending_reg,
- },
- {
- .base = GIC_DIST_PENDING_CLEAR,
- .len = VGIC_MAX_IRQS / 8,
- .bits_per_irq = 1,
- .handle_mmio = handle_mmio_clear_pending_reg,
- },
- {
- .base = GIC_DIST_ACTIVE_SET,
- .len = VGIC_MAX_IRQS / 8,
- .bits_per_irq = 1,
- .handle_mmio = handle_mmio_raz_wi,
- },
- {
- .base = GIC_DIST_ACTIVE_CLEAR,
- .len = VGIC_MAX_IRQS / 8,
- .bits_per_irq = 1,
- .handle_mmio = handle_mmio_raz_wi,
- },
- {
- .base = GIC_DIST_PRI,
- .len = VGIC_MAX_IRQS,
- .bits_per_irq = 8,
- .handle_mmio = handle_mmio_priority_reg,
- },
- {
- .base = GIC_DIST_TARGET,
- .len = VGIC_MAX_IRQS,
- .bits_per_irq = 8,
- .handle_mmio = handle_mmio_target_reg,
- },
- {
- .base = GIC_DIST_CONFIG,
- .len = VGIC_MAX_IRQS / 4,
- .bits_per_irq = 2,
- .handle_mmio = handle_mmio_cfg_reg,
- },
- {
- .base = GIC_DIST_SOFTINT,
- .len = 4,
- .handle_mmio = handle_mmio_sgi_reg,
- },
- {
- .base = GIC_DIST_SGI_PENDING_CLEAR,
- .len = VGIC_NR_SGIS,
- .handle_mmio = handle_mmio_sgi_clear,
- },
- {
- .base = GIC_DIST_SGI_PENDING_SET,
- .len = VGIC_NR_SGIS,
- .handle_mmio = handle_mmio_sgi_set,
- },
- {}
-};
-
const
struct kvm_mmio_range *vgic_find_range(const struct kvm_mmio_range *ranges,
struct kvm_exit_mmio *mmio,
@@ -1127,24 +774,6 @@ bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
return true;
}
-static bool vgic_v2_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
- struct kvm_exit_mmio *mmio)
-{
- unsigned long base = vcpu->kvm->arch.vgic.vgic_dist_base;
-
- if (!is_in_range(mmio->phys_addr, mmio->len, base,
- KVM_VGIC_V2_DIST_SIZE))
- return false;
-
- /* GICv2 does not support accesses wider than 32 bits */
- if (mmio->len > 4) {
- kvm_inject_dabt(vcpu, mmio->phys_addr);
- return true;
- }
-
- return vgic_handle_mmio_range(vcpu, run, mmio, vgic_dist_ranges, base);
-}
-
/**
* vgic_handle_mmio - handle an in-kernel MMIO access for the GIC emulation
* @vcpu: pointer to the vcpu performing the access
@@ -1169,52 +798,6 @@ bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
return vcpu->kvm->arch.vgic.vm_ops.handle_mmio(vcpu, run, mmio);
}
-static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi)
-{
- return dist->irq_sgi_sources + vcpu_id * VGIC_NR_SGIS + sgi;
-}
-
-static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg)
-{
- struct kvm *kvm = vcpu->kvm;
- struct vgic_dist *dist = &kvm->arch.vgic;
- int nrcpus = atomic_read(&kvm->online_vcpus);
- u8 target_cpus;
- int sgi, mode, c, vcpu_id;
-
- vcpu_id = vcpu->vcpu_id;
-
- sgi = reg & 0xf;
- target_cpus = (reg >> 16) & 0xff;
- mode = (reg >> 24) & 3;
-
- switch (mode) {
- case 0:
- if (!target_cpus)
- return;
- break;
-
- case 1:
- target_cpus = ((1 << nrcpus) - 1) & ~(1 << vcpu_id) & 0xff;
- break;
-
- case 2:
- target_cpus = 1 << vcpu_id;
- break;
- }
-
- kvm_for_each_vcpu(c, vcpu, kvm) {
- if (target_cpus & 1) {
- /* Flag the SGI as pending */
- vgic_dist_irq_set_pending(vcpu, sgi);
- *vgic_get_sgi_sources(dist, c, sgi) |= 1 << vcpu_id;
- kvm_debug("SGI%d from CPU%d to CPU%d\n", sgi, vcpu_id, c);
- }
-
- target_cpus >>= 1;
- }
-}
-
static int vgic_nr_shared_irqs(struct vgic_dist *dist)
{
return dist->nr_irqs - VGIC_NR_PRIVATE_IRQS;
@@ -1368,6 +951,7 @@ static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
/*
* Queue an interrupt to a CPU virtual interface. Return true on success,
* or false if it wasn't possible to queue it.
+ * sgi_source must be zero for any non-SGI interrupts.
*/
bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
{
@@ -1418,37 +1002,6 @@ bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
return true;
}
-static bool vgic_v2_queue_sgi(struct kvm_vcpu *vcpu, int irq)
-{
- struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- unsigned long sources;
- int vcpu_id = vcpu->vcpu_id;
- int c;
-
- sources = *vgic_get_sgi_sources(dist, vcpu_id, irq);
-
- for_each_set_bit(c, &sources, dist->nr_cpus) {
- if (vgic_queue_irq(vcpu, c, irq))
- clear_bit(c, &sources);
- }
-
- *vgic_get_sgi_sources(dist, vcpu_id, irq) = sources;
-
- /*
- * If the sources bitmap has been cleared it means that we
- * could queue all the SGIs onto link registers (see the
- * clear_bit above), and therefore we are done with them in
- * our emulated gic and can get rid of them.
- */
- if (!sources) {
- vgic_dist_irq_clear_pending(vcpu, irq);
- vgic_cpu_irq_clear(vcpu, irq);
- return true;
- }
-
- return false;
-}
-
static bool vgic_queue_hwirq(struct kvm_vcpu *vcpu, int irq)
{
if (!vgic_can_sample_irq(vcpu, irq))
@@ -1894,16 +1447,6 @@ void kvm_vgic_destroy(struct kvm *kvm)
dist->nr_cpus = 0;
}
-static int vgic_v2_init_model(struct kvm *kvm)
-{
- int i;
-
- for (i = VGIC_NR_PRIVATE_IRQS; i < kvm->arch.vgic.nr_irqs; i += 4)
- vgic_set_target_reg(kvm, 0, i);
-
- return 0;
-}
-
/*
* Allocate and initialize the various data structures. Must be called
* with kvm->lock held!
@@ -1994,73 +1537,6 @@ out:
return ret;
}
-/**
- * kvm_vgic_map_resources - Configure global VGIC state before running any VCPUs
- * @kvm: pointer to the kvm struct
- *
- * Map the virtual CPU interface into the VM before running any VCPUs. We
- * can't do this at creation time, because user space must first set the
- * virtual CPU interface address in the guest physical address space.
- */
-static int vgic_v2_map_resources(struct kvm *kvm,
- const struct vgic_params *params)
-{
- int ret = 0;
-
- if (!irqchip_in_kernel(kvm))
- return 0;
-
- mutex_lock(&kvm->lock);
-
- if (vgic_ready(kvm))
- goto out;
-
- if (IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_dist_base) ||
- IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_cpu_base)) {
- kvm_err("Need to set vgic cpu and dist addresses first\n");
- ret = -ENXIO;
- goto out;
- }
-
- /*
- * Initialize the vgic if this hasn't already been done on demand by
- * accessing the vgic state from userspace.
- */
- ret = vgic_init(kvm);
- if (ret) {
- kvm_err("Unable to allocate maps\n");
- goto out;
- }
-
- ret = kvm_phys_addr_ioremap(kvm, kvm->arch.vgic.vgic_cpu_base,
- params->vcpu_base, KVM_VGIC_V2_CPU_SIZE,
- true);
- if (ret) {
- kvm_err("Unable to remap VGIC CPU to VCPU\n");
- goto out;
- }
-
- kvm->arch.vgic.ready = true;
-out:
- if (ret)
- kvm_vgic_destroy(kvm);
- mutex_unlock(&kvm->lock);
- return ret;
-}
-
-void vgic_v2_init_emulation(struct kvm *kvm)
-{
- struct vgic_dist *dist = &kvm->arch.vgic;
-
- dist->vm_ops.handle_mmio = vgic_v2_handle_mmio;
- dist->vm_ops.queue_sgi = vgic_v2_queue_sgi;
- dist->vm_ops.add_sgi_source = vgic_v2_add_sgi_source;
- dist->vm_ops.init_model = vgic_v2_init_model;
- dist->vm_ops.map_resources = vgic_v2_map_resources;
-
- kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
-}
-
static int init_vgic_model(struct kvm *kvm, int type)
{
switch (type) {
@@ -2210,188 +1686,6 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
return r;
}
-static bool handle_cpu_mmio_misc(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio, phys_addr_t offset)
-{
- bool updated = false;
- struct vgic_vmcr vmcr;
- u32 *vmcr_field;
- u32 reg;
-
- vgic_get_vmcr(vcpu, &vmcr);
-
- switch (offset & ~0x3) {
- case GIC_CPU_CTRL:
- vmcr_field = &vmcr.ctlr;
- break;
- case GIC_CPU_PRIMASK:
- vmcr_field = &vmcr.pmr;
- break;
- case GIC_CPU_BINPOINT:
- vmcr_field = &vmcr.bpr;
- break;
- case GIC_CPU_ALIAS_BINPOINT:
- vmcr_field = &vmcr.abpr;
- break;
- default:
- BUG();
- }
-
- if (!mmio->is_write) {
- reg = *vmcr_field;
- mmio_data_write(mmio, ~0, reg);
- } else {
- reg = mmio_data_read(mmio, ~0);
- if (reg != *vmcr_field) {
- *vmcr_field = reg;
- vgic_set_vmcr(vcpu, &vmcr);
- updated = true;
- }
- }
- return updated;
-}
-
-static bool handle_mmio_abpr(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio, phys_addr_t offset)
-{
- return handle_cpu_mmio_misc(vcpu, mmio, GIC_CPU_ALIAS_BINPOINT);
-}
-
-static bool handle_cpu_mmio_ident(struct kvm_vcpu *vcpu,
- struct kvm_exit_mmio *mmio,
- phys_addr_t offset)
-{
- u32 reg;
-
- if (mmio->is_write)
- return false;
-
- /* GICC_IIDR */
- reg = (PRODUCT_ID_KVM << 20) |
- (GICC_ARCH_VERSION_V2 << 16) |
- (IMPLEMENTER_ARM << 0);
- mmio_data_write(mmio, ~0, reg);
- return false;
-}
-
-/*
- * CPU Interface Register accesses - these are not accessed by the VM, but by
- * user space for saving and restoring VGIC state.
- */
-static const struct kvm_mmio_range vgic_cpu_ranges[] = {
- {
- .base = GIC_CPU_CTRL,
- .len = 12,
- .handle_mmio = handle_cpu_mmio_misc,
- },
- {
- .base = GIC_CPU_ALIAS_BINPOINT,
- .len = 4,
- .handle_mmio = handle_mmio_abpr,
- },
- {
- .base = GIC_CPU_ACTIVEPRIO,
- .len = 16,
- .handle_mmio = handle_mmio_raz_wi,
- },
- {
- .base = GIC_CPU_IDENT,
- .len = 4,
- .handle_mmio = handle_cpu_mmio_ident,
- },
-};
-
-static int vgic_attr_regs_access(struct kvm_device *dev,
- struct kvm_device_attr *attr,
- u32 *reg, bool is_write)
-{
- const struct kvm_mmio_range *r = NULL, *ranges;
- phys_addr_t offset;
- int ret, cpuid, c;
- struct kvm_vcpu *vcpu, *tmp_vcpu;
- struct vgic_dist *vgic;
- struct kvm_exit_mmio mmio;
-
- offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
- cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >>
- KVM_DEV_ARM_VGIC_CPUID_SHIFT;
-
- mutex_lock(&dev->kvm->lock);
-
- ret = vgic_init(dev->kvm);
- if (ret)
- goto out;
-
- if (cpuid >= atomic_read(&dev->kvm->online_vcpus)) {
- ret = -EINVAL;
- goto out;
- }
-
- vcpu = kvm_get_vcpu(dev->kvm, cpuid);
- vgic = &dev->kvm->arch.vgic;
-
- mmio.len = 4;
- mmio.is_write = is_write;
- if (is_write)
- mmio_data_write(&mmio, ~0, *reg);
- switch (attr->group) {
- case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
- mmio.phys_addr = vgic->vgic_dist_base + offset;
- ranges = vgic_dist_ranges;
- break;
- case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
- mmio.phys_addr = vgic->vgic_cpu_base + offset;
- ranges = vgic_cpu_ranges;
- break;
- default:
- BUG();
- }
- r = vgic_find_range(ranges, &mmio, offset);
-
- if (unlikely(!r || !r->handle_mmio)) {
- ret = -ENXIO;
- goto out;
- }
-
-
- spin_lock(&vgic->lock);
-
- /*
- * Ensure that no other VCPU is running by checking the vcpu->cpu
- * field. If no other VPCUs are running we can safely access the VGIC
- * state, because even if another VPU is run after this point, that
- * VCPU will not touch the vgic state, because it will block on
- * getting the vgic->lock in kvm_vgic_sync_hwstate().
- */
- kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm) {
- if (unlikely(tmp_vcpu->cpu != -1)) {
- ret = -EBUSY;
- goto out_vgic_unlock;
- }
- }
-
- /*
- * Move all pending IRQs from the LRs on all VCPUs so the pending
- * state can be properly represented in the register state accessible
- * through this API.
- */
- kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm)
- vgic_unqueue_irqs(tmp_vcpu);
-
- offset -= r->base;
- r->handle_mmio(vcpu, &mmio, offset);
-
- if (!is_write)
- *reg = mmio_data_read(&mmio, ~0);
-
- ret = 0;
-out_vgic_unlock:
- spin_unlock(&vgic->lock);
-out:
- mutex_unlock(&dev->kvm->lock);
- return ret;
-}
-
int vgic_set_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
int r;
@@ -2451,31 +1745,6 @@ int vgic_set_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return -ENXIO;
}
-static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
-{
- int ret;
-
- ret = vgic_set_common_attr(dev, attr);
- if (ret != -ENXIO)
- return ret;
-
- switch (attr->group) {
- case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
- case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
- u32 __user *uaddr = (u32 __user *)(long)attr->addr;
- u32 reg;
-
- if (get_user(reg, uaddr))
- return -EFAULT;
-
- return vgic_attr_regs_access(dev, attr, ®, true);
- }
-
- }
-
- return -ENXIO;
-}
-
int vgic_get_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
int r = -ENXIO;
@@ -2506,31 +1775,6 @@ int vgic_get_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return r;
}
-static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
-{
- int ret;
-
- ret = vgic_get_common_attr(dev, attr);
- if (ret != -ENXIO)
- return ret;
-
- switch (attr->group) {
- case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
- case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
- u32 __user *uaddr = (u32 __user *)(long)attr->addr;
- u32 reg = 0;
-
- ret = vgic_attr_regs_access(dev, attr, ®, false);
- if (ret)
- return ret;
- return put_user(reg, uaddr);
- }
-
- }
-
- return -ENXIO;
-}
-
int vgic_has_attr_regs(const struct kvm_mmio_range *ranges, phys_addr_t offset)
{
struct kvm_exit_mmio dev_attr_mmio;
@@ -2542,54 +1786,6 @@ int vgic_has_attr_regs(const struct kvm_mmio_range *ranges, phys_addr_t offset)
return -ENXIO;
}
-static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
-{
- phys_addr_t offset;
-
- switch (attr->group) {
- case KVM_DEV_ARM_VGIC_GRP_ADDR:
- switch (attr->attr) {
- case KVM_VGIC_V2_ADDR_TYPE_DIST:
- case KVM_VGIC_V2_ADDR_TYPE_CPU:
- return 0;
- }
- break;
- case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
- offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
- return vgic_has_attr_regs(vgic_dist_ranges, offset);
- case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
- offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
- return vgic_has_attr_regs(vgic_cpu_ranges, offset);
- case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
- return 0;
- case KVM_DEV_ARM_VGIC_GRP_CTRL:
- switch (attr->attr) {
- case KVM_DEV_ARM_VGIC_CTRL_INIT:
- return 0;
- }
- }
- return -ENXIO;
-}
-
-void vgic_destroy(struct kvm_device *dev)
-{
- kfree(dev);
-}
-
-int vgic_create(struct kvm_device *dev, u32 type)
-{
- return kvm_vgic_create(dev->kvm, type);
-}
-
-struct kvm_device_ops kvm_arm_vgic_v2_ops = {
- .name = "kvm-arm-vgic",
- .create = vgic_create,
- .destroy = vgic_destroy,
- .set_attr = vgic_set_attr,
- .get_attr = vgic_get_attr,
- .has_attr = vgic_has_attr,
-};
-
static void vgic_init_maintenance_interrupt(void *info)
{
enable_percpu_irq(vgic->maint_irq, 0);
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 28/36] arm/arm64: KVM: add opaque private pointer to MMIO data
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (26 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 27/36] arm/arm64: KVM: split GICv2 specific emulation code from vgic.c Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 29/36] arm/arm64: KVM: add virtual GICv3 distributor emulation Christoffer Dall
` (7 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
For a GICv2 there is always only one (v)CPU involved: the one that
does the access. On a GICv3 the access to a CPU redistributor is
memory-mapped, but not banked, so the (v)CPU affected is determined by
looking at the MMIO address region being accessed.
To allow passing the affected CPU into the accessors later, extend
struct kvm_exit_mmio to add an opaque private pointer parameter.
The current GICv2 emulation just does not use it.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm/include/asm/kvm_mmio.h | 1 +
arch/arm64/include/asm/kvm_mmio.h | 1 +
virt/kvm/arm/vgic.c | 1 +
3 files changed, 3 insertions(+)
diff --git a/arch/arm/include/asm/kvm_mmio.h b/arch/arm/include/asm/kvm_mmio.h
index adcc0d7..3f83db2 100644
--- a/arch/arm/include/asm/kvm_mmio.h
+++ b/arch/arm/include/asm/kvm_mmio.h
@@ -37,6 +37,7 @@ struct kvm_exit_mmio {
u8 data[8];
u32 len;
bool is_write;
+ void *private;
};
static inline void kvm_prepare_mmio(struct kvm_run *run,
diff --git a/arch/arm64/include/asm/kvm_mmio.h b/arch/arm64/include/asm/kvm_mmio.h
index fc2f689..9f52beb 100644
--- a/arch/arm64/include/asm/kvm_mmio.h
+++ b/arch/arm64/include/asm/kvm_mmio.h
@@ -40,6 +40,7 @@ struct kvm_exit_mmio {
u8 data[8];
u32 len;
bool is_write;
+ void *private;
};
static inline void kvm_prepare_mmio(struct kvm_run *run,
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 0e84292..b6e17c8 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -709,6 +709,7 @@ static bool call_range_handler(struct kvm_vcpu *vcpu,
mmio32.len = 4;
mmio32.is_write = mmio->is_write;
+ mmio32.private = mmio->private;
mmio32.phys_addr = mmio->phys_addr + 4;
if (mmio->is_write)
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 29/36] arm/arm64: KVM: add virtual GICv3 distributor emulation
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (27 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 28/36] arm/arm64: KVM: add opaque private pointer to MMIO data Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:02 ` [GIT PULL 30/36] arm64: GICv3: introduce symbolic names for GICv3 ICC_SGI1R_EL1 fields Christoffer Dall
` (6 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
With everything separated and prepared, we implement a model of a
GICv3 distributor and redistributors by using the existing framework
to provide handler functions for each register group.
Currently we limit the emulation to a model enforcing a single
security state, with SRE==1 (forcing system register access) and
ARE==1 (allowing more than 8 VCPUs).
We share some of the functions provided for GICv2 emulation, but take
the different ways of addressing (v)CPUs into account.
Save and restore is currently not implemented.
Similar to the split-off of the GICv2 specific code, the new emulation
code goes into a new file (vgic-v3-emul.c).
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm64/kvm/Makefile | 1 +
include/kvm/arm_vgic.h | 9 +-
include/linux/irqchip/arm-gic-v3.h | 32 ++
include/linux/kvm_host.h | 1 +
include/uapi/linux/kvm.h | 2 +
virt/kvm/arm/vgic-v3-emul.c | 922 +++++++++++++++++++++++++++++++++++++
virt/kvm/arm/vgic.c | 11 +-
virt/kvm/arm/vgic.h | 3 +
8 files changed, 978 insertions(+), 3 deletions(-)
create mode 100644 virt/kvm/arm/vgic-v3-emul.c
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index d957353..4e6e09e 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -24,5 +24,6 @@ kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v2.o
kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v2-emul.o
kvm-$(CONFIG_KVM_ARM_VGIC) += vgic-v2-switch.o
kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v3.o
+kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic-v3-emul.o
kvm-$(CONFIG_KVM_ARM_VGIC) += vgic-v3-switch.o
kvm-$(CONFIG_KVM_ARM_TIMER) += $(KVM)/arm/arch_timer.o
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index ff04afd..98c3016 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -162,7 +162,11 @@ struct vgic_dist {
/* Distributor and vcpu interface mapping in the guest */
phys_addr_t vgic_dist_base;
- phys_addr_t vgic_cpu_base;
+ /* GICv2 and GICv3 use different mapped register blocks */
+ union {
+ phys_addr_t vgic_cpu_base;
+ phys_addr_t vgic_redist_base;
+ };
/* Distributor enabled */
u32 enabled;
@@ -224,6 +228,9 @@ struct vgic_dist {
*/
struct vgic_bitmap *irq_spi_target;
+ /* Target MPIDR for each IRQ (needed for GICv3 IROUTERn) only */
+ u32 *irq_spi_mpidr;
+
/* Bitmap indicating which CPU has something pending */
unsigned long *irq_pending_on_cpu;
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 1e8b0cf..3fb4d85 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -33,6 +33,7 @@
#define GICD_SETSPI_SR 0x0050
#define GICD_CLRSPI_SR 0x0058
#define GICD_SEIR 0x0068
+#define GICD_IGROUPR 0x0080
#define GICD_ISENABLER 0x0100
#define GICD_ICENABLER 0x0180
#define GICD_ISPENDR 0x0200
@@ -41,14 +42,37 @@
#define GICD_ICACTIVER 0x0380
#define GICD_IPRIORITYR 0x0400
#define GICD_ICFGR 0x0C00
+#define GICD_IGRPMODR 0x0D00
+#define GICD_NSACR 0x0E00
#define GICD_IROUTER 0x6000
+#define GICD_IDREGS 0xFFD0
#define GICD_PIDR2 0xFFE8
+/*
+ * Those registers are actually from GICv2, but the spec demands that they
+ * are implemented as RES0 if ARE is 1 (which we do in KVM's emulated GICv3).
+ */
+#define GICD_ITARGETSR 0x0800
+#define GICD_SGIR 0x0F00
+#define GICD_CPENDSGIR 0x0F10
+#define GICD_SPENDSGIR 0x0F20
+
#define GICD_CTLR_RWP (1U << 31)
+#define GICD_CTLR_DS (1U << 6)
#define GICD_CTLR_ARE_NS (1U << 4)
#define GICD_CTLR_ENABLE_G1A (1U << 1)
#define GICD_CTLR_ENABLE_G1 (1U << 0)
+/*
+ * In systems with a single security state (what we emulate in KVM)
+ * the meaning of the interrupt group enable bits is slightly different
+ */
+#define GICD_CTLR_ENABLE_SS_G1 (1U << 1)
+#define GICD_CTLR_ENABLE_SS_G0 (1U << 0)
+
+#define GICD_TYPER_LPIS (1U << 17)
+#define GICD_TYPER_MBIS (1U << 16)
+
#define GICD_TYPER_ID_BITS(typer) ((((typer) >> 19) & 0x1f) + 1)
#define GICD_TYPER_IRQS(typer) ((((typer) & 0x1f) + 1) * 32)
#define GICD_TYPER_LPIS (1U << 17)
@@ -60,6 +84,8 @@
#define GIC_PIDR2_ARCH_GICv3 0x30
#define GIC_PIDR2_ARCH_GICv4 0x40
+#define GIC_V3_DIST_SIZE 0x10000
+
/*
* Re-Distributor registers, offsets from RD_base
*/
@@ -78,6 +104,7 @@
#define GICR_SYNCR 0x00C0
#define GICR_MOVLPIR 0x0100
#define GICR_MOVALLR 0x0110
+#define GICR_IDREGS GICD_IDREGS
#define GICR_PIDR2 GICD_PIDR2
#define GICR_CTLR_ENABLE_LPIS (1UL << 0)
@@ -104,6 +131,7 @@
/*
* Re-Distributor registers, offsets from SGI_base
*/
+#define GICR_IGROUPR0 GICD_IGROUPR
#define GICR_ISENABLER0 GICD_ISENABLER
#define GICR_ICENABLER0 GICD_ICENABLER
#define GICR_ISPENDR0 GICD_ISPENDR
@@ -112,11 +140,15 @@
#define GICR_ICACTIVER0 GICD_ICACTIVER
#define GICR_IPRIORITYR0 GICD_IPRIORITYR
#define GICR_ICFGR0 GICD_ICFGR
+#define GICR_IGRPMODR0 GICD_IGRPMODR
+#define GICR_NSACR GICD_NSACR
#define GICR_TYPER_PLPIS (1U << 0)
#define GICR_TYPER_VLPIS (1U << 1)
#define GICR_TYPER_LAST (1U << 4)
+#define GIC_V3_REDIST_SIZE 0x20000
+
#define LPI_PROP_GROUP1 (1 << 1)
#define LPI_PROP_ENABLED (1 << 0)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 25d7ce3..0ef2daa 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1052,6 +1052,7 @@ void kvm_unregister_device_ops(u32 type);
extern struct kvm_device_ops kvm_mpic_ops;
extern struct kvm_device_ops kvm_xics_ops;
extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
+extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index a37fd12..b4e6f1e 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -952,6 +952,8 @@ enum kvm_device_type {
#define KVM_DEV_TYPE_ARM_VGIC_V2 KVM_DEV_TYPE_ARM_VGIC_V2
KVM_DEV_TYPE_FLIC,
#define KVM_DEV_TYPE_FLIC KVM_DEV_TYPE_FLIC
+ KVM_DEV_TYPE_ARM_VGIC_V3,
+#define KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_V3
KVM_DEV_TYPE_MAX,
};
diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
new file mode 100644
index 0000000..8db1db5
--- /dev/null
+++ b/virt/kvm/arm/vgic-v3-emul.c
@@ -0,0 +1,922 @@
+/*
+ * GICv3 distributor and redistributor emulation
+ *
+ * GICv3 emulation is currently only supported on a GICv3 host (because
+ * we rely on the hardware's CPU interface virtualization support), but
+ * supports both hardware with or without the optional GICv2 backwards
+ * compatibility features.
+ *
+ * Limitations of the emulation:
+ * (RAZ/WI: read as zero, write ignore, RAO/WI: read as one, write ignore)
+ * - We do not support LPIs (yet). TYPER.LPIS is reported as 0 and is RAZ/WI.
+ * - We do not support the message based interrupts (MBIs) triggered by
+ * writes to the GICD_{SET,CLR}SPI_* registers. TYPER.MBIS is reported as 0.
+ * - We do not support the (optional) backwards compatibility feature.
+ * GICD_CTLR.ARE resets to 1 and is RAO/WI. If the _host_ GIC supports
+ * the compatiblity feature, you can use a GICv2 in the guest, though.
+ * - We only support a single security state. GICD_CTLR.DS is 1 and is RAO/WI.
+ * - Priorities are not emulated (same as the GICv2 emulation). Linux
+ * as a guest is fine with this, because it does not use priorities.
+ * - We only support Group1 interrupts. Again Linux uses only those.
+ *
+ * Copyright (C) 2014 ARM Ltd.
+ * Author: Andre Przywara <andre.przywara@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/cpu.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/interrupt.h>
+
+#include <linux/irqchip/arm-gic-v3.h>
+#include <kvm/arm_vgic.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+
+#include "vgic.h"
+
+static bool handle_mmio_rao_wi(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ u32 reg = 0xffffffff;
+
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+
+ return false;
+}
+
+static bool handle_mmio_ctlr(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ u32 reg = 0;
+
+ /*
+ * Force ARE and DS to 1, the guest cannot change this.
+ * For the time being we only support Group1 interrupts.
+ */
+ if (vcpu->kvm->arch.vgic.enabled)
+ reg = GICD_CTLR_ENABLE_SS_G1;
+ reg |= GICD_CTLR_ARE_NS | GICD_CTLR_DS;
+
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+ if (mmio->is_write) {
+ if (reg & GICD_CTLR_ENABLE_SS_G0)
+ kvm_info("guest tried to enable unsupported Group0 interrupts\n");
+ vcpu->kvm->arch.vgic.enabled = !!(reg & GICD_CTLR_ENABLE_SS_G1);
+ vgic_update_state(vcpu->kvm);
+ return true;
+ }
+ return false;
+}
+
+/*
+ * As this implementation does not provide compatibility
+ * with GICv2 (ARE==1), we report zero CPUs in bits [5..7].
+ * Also LPIs and MBIs are not supported, so we set the respective bits to 0.
+ * Also we report at most 2**10=1024 interrupt IDs (to match 1024 SPIs).
+ */
+#define INTERRUPT_ID_BITS 10
+static bool handle_mmio_typer(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ u32 reg;
+
+ reg = (min(vcpu->kvm->arch.vgic.nr_irqs, 1024) >> 5) - 1;
+
+ reg |= (INTERRUPT_ID_BITS - 1) << 19;
+
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+
+ return false;
+}
+
+static bool handle_mmio_iidr(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ u32 reg;
+
+ reg = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+
+ return false;
+}
+
+static bool handle_mmio_set_enable_reg_dist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ if (likely(offset >= VGIC_NR_PRIVATE_IRQS / 8))
+ return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id,
+ ACCESS_WRITE_SETBIT);
+
+ vgic_reg_access(mmio, NULL, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ return false;
+}
+
+static bool handle_mmio_clear_enable_reg_dist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ if (likely(offset >= VGIC_NR_PRIVATE_IRQS / 8))
+ return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id,
+ ACCESS_WRITE_CLEARBIT);
+
+ vgic_reg_access(mmio, NULL, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ return false;
+}
+
+static bool handle_mmio_set_pending_reg_dist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ if (likely(offset >= VGIC_NR_PRIVATE_IRQS / 8))
+ return vgic_handle_set_pending_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id);
+
+ vgic_reg_access(mmio, NULL, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ return false;
+}
+
+static bool handle_mmio_clear_pending_reg_dist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ if (likely(offset >= VGIC_NR_PRIVATE_IRQS / 8))
+ return vgic_handle_clear_pending_reg(vcpu->kvm, mmio, offset,
+ vcpu->vcpu_id);
+
+ vgic_reg_access(mmio, NULL, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ return false;
+}
+
+static bool handle_mmio_priority_reg_dist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ u32 *reg;
+
+ if (unlikely(offset < VGIC_NR_PRIVATE_IRQS)) {
+ vgic_reg_access(mmio, NULL, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ return false;
+ }
+
+ reg = vgic_bytemap_get_reg(&vcpu->kvm->arch.vgic.irq_priority,
+ vcpu->vcpu_id, offset);
+ vgic_reg_access(mmio, reg, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+ return false;
+}
+
+static bool handle_mmio_cfg_reg_dist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ u32 *reg;
+
+ if (unlikely(offset < VGIC_NR_PRIVATE_IRQS / 4)) {
+ vgic_reg_access(mmio, NULL, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ return false;
+ }
+
+ reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
+ vcpu->vcpu_id, offset >> 1);
+
+ return vgic_handle_cfg_reg(reg, mmio, offset);
+}
+
+/*
+ * We use a compressed version of the MPIDR (all 32 bits in one 32-bit word)
+ * when we store the target MPIDR written by the guest.
+ */
+static u32 compress_mpidr(unsigned long mpidr)
+{
+ u32 ret;
+
+ ret = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ ret |= MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8;
+ ret |= MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16;
+ ret |= MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24;
+
+ return ret;
+}
+
+static unsigned long uncompress_mpidr(u32 value)
+{
+ unsigned long mpidr;
+
+ mpidr = ((value >> 0) & 0xFF) << MPIDR_LEVEL_SHIFT(0);
+ mpidr |= ((value >> 8) & 0xFF) << MPIDR_LEVEL_SHIFT(1);
+ mpidr |= ((value >> 16) & 0xFF) << MPIDR_LEVEL_SHIFT(2);
+ mpidr |= (u64)((value >> 24) & 0xFF) << MPIDR_LEVEL_SHIFT(3);
+
+ return mpidr;
+}
+
+/*
+ * Lookup the given MPIDR value to get the vcpu_id (if there is one)
+ * and store that in the irq_spi_cpu[] array.
+ * This limits the number of VCPUs to 255 for now, extending the data
+ * type (or storing kvm_vcpu pointers) should lift the limit.
+ * Store the original MPIDR value in an extra array to support read-as-written.
+ * Unallocated MPIDRs are translated to a special value and caught
+ * before any array accesses.
+ */
+static bool handle_mmio_route_reg(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ int spi;
+ u32 reg;
+ int vcpu_id;
+ unsigned long *bmap, mpidr;
+
+ /*
+ * The upper 32 bits of each 64 bit register are zero,
+ * as we don't support Aff3.
+ */
+ if ((offset & 4)) {
+ vgic_reg_access(mmio, NULL, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ return false;
+ }
+
+ /* This region only covers SPIs, so no handling of private IRQs here. */
+ spi = offset / 8;
+
+ /* get the stored MPIDR for this IRQ */
+ mpidr = uncompress_mpidr(dist->irq_spi_mpidr[spi]);
+ reg = mpidr;
+
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+
+ if (!mmio->is_write)
+ return false;
+
+ /*
+ * Now clear the currently assigned vCPU from the map, making room
+ * for the new one to be written below
+ */
+ vcpu = kvm_mpidr_to_vcpu(kvm, mpidr);
+ if (likely(vcpu)) {
+ vcpu_id = vcpu->vcpu_id;
+ bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[vcpu_id]);
+ __clear_bit(spi, bmap);
+ }
+
+ dist->irq_spi_mpidr[spi] = compress_mpidr(reg);
+ vcpu = kvm_mpidr_to_vcpu(kvm, reg & MPIDR_HWID_BITMASK);
+
+ /*
+ * The spec says that non-existent MPIDR values should not be
+ * forwarded to any existent (v)CPU, but should be able to become
+ * pending anyway. We simply keep the irq_spi_target[] array empty, so
+ * the interrupt will never be injected.
+ * irq_spi_cpu[irq] gets a magic value in this case.
+ */
+ if (likely(vcpu)) {
+ vcpu_id = vcpu->vcpu_id;
+ dist->irq_spi_cpu[spi] = vcpu_id;
+ bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[vcpu_id]);
+ __set_bit(spi, bmap);
+ } else {
+ dist->irq_spi_cpu[spi] = VCPU_NOT_ALLOCATED;
+ }
+
+ vgic_update_state(kvm);
+
+ return true;
+}
+
+/*
+ * We should be careful about promising too much when a guest reads
+ * this register. Don't claim to be like any hardware implementation,
+ * but just report the GIC as version 3 - which is what a Linux guest
+ * would check.
+ */
+static bool handle_mmio_idregs(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ u32 reg = 0;
+
+ switch (offset + GICD_IDREGS) {
+ case GICD_PIDR2:
+ reg = 0x3b;
+ break;
+ }
+
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+
+ return false;
+}
+
+static const struct kvm_mmio_range vgic_v3_dist_ranges[] = {
+ {
+ .base = GICD_CTLR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_ctlr,
+ },
+ {
+ .base = GICD_TYPER,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_typer,
+ },
+ {
+ .base = GICD_IIDR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_iidr,
+ },
+ {
+ /* this register is optional, it is RAZ/WI if not implemented */
+ .base = GICD_STATUSR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ /* this write only register is WI when TYPER.MBIS=0 */
+ .base = GICD_SETSPI_NSR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ /* this write only register is WI when TYPER.MBIS=0 */
+ .base = GICD_CLRSPI_NSR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ /* this is RAZ/WI when DS=1 */
+ .base = GICD_SETSPI_SR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ /* this is RAZ/WI when DS=1 */
+ .base = GICD_CLRSPI_SR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICD_IGROUPR,
+ .len = 0x80,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_rao_wi,
+ },
+ {
+ .base = GICD_ISENABLER,
+ .len = 0x80,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_set_enable_reg_dist,
+ },
+ {
+ .base = GICD_ICENABLER,
+ .len = 0x80,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_clear_enable_reg_dist,
+ },
+ {
+ .base = GICD_ISPENDR,
+ .len = 0x80,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_set_pending_reg_dist,
+ },
+ {
+ .base = GICD_ICPENDR,
+ .len = 0x80,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_clear_pending_reg_dist,
+ },
+ {
+ .base = GICD_ISACTIVER,
+ .len = 0x80,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICD_ICACTIVER,
+ .len = 0x80,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICD_IPRIORITYR,
+ .len = 0x400,
+ .bits_per_irq = 8,
+ .handle_mmio = handle_mmio_priority_reg_dist,
+ },
+ {
+ /* TARGETSRn is RES0 when ARE=1 */
+ .base = GICD_ITARGETSR,
+ .len = 0x400,
+ .bits_per_irq = 8,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICD_ICFGR,
+ .len = 0x100,
+ .bits_per_irq = 2,
+ .handle_mmio = handle_mmio_cfg_reg_dist,
+ },
+ {
+ /* this is RAZ/WI when DS=1 */
+ .base = GICD_IGRPMODR,
+ .len = 0x80,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ /* this is RAZ/WI when DS=1 */
+ .base = GICD_NSACR,
+ .len = 0x100,
+ .bits_per_irq = 2,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ /* this is RAZ/WI when ARE=1 */
+ .base = GICD_SGIR,
+ .len = 0x04,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ /* this is RAZ/WI when ARE=1 */
+ .base = GICD_CPENDSGIR,
+ .len = 0x10,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ /* this is RAZ/WI when ARE=1 */
+ .base = GICD_SPENDSGIR,
+ .len = 0x10,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICD_IROUTER + 0x100,
+ .len = 0x1ee0,
+ .bits_per_irq = 64,
+ .handle_mmio = handle_mmio_route_reg,
+ },
+ {
+ .base = GICD_IDREGS,
+ .len = 0x30,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_idregs,
+ },
+ {},
+};
+
+static bool handle_mmio_set_enable_reg_redist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ struct kvm_vcpu *redist_vcpu = mmio->private;
+
+ return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
+ redist_vcpu->vcpu_id,
+ ACCESS_WRITE_SETBIT);
+}
+
+static bool handle_mmio_clear_enable_reg_redist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ struct kvm_vcpu *redist_vcpu = mmio->private;
+
+ return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
+ redist_vcpu->vcpu_id,
+ ACCESS_WRITE_CLEARBIT);
+}
+
+static bool handle_mmio_set_pending_reg_redist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ struct kvm_vcpu *redist_vcpu = mmio->private;
+
+ return vgic_handle_set_pending_reg(vcpu->kvm, mmio, offset,
+ redist_vcpu->vcpu_id);
+}
+
+static bool handle_mmio_clear_pending_reg_redist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ struct kvm_vcpu *redist_vcpu = mmio->private;
+
+ return vgic_handle_clear_pending_reg(vcpu->kvm, mmio, offset,
+ redist_vcpu->vcpu_id);
+}
+
+static bool handle_mmio_priority_reg_redist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ struct kvm_vcpu *redist_vcpu = mmio->private;
+ u32 *reg;
+
+ reg = vgic_bytemap_get_reg(&vcpu->kvm->arch.vgic.irq_priority,
+ redist_vcpu->vcpu_id, offset);
+ vgic_reg_access(mmio, reg, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+ return false;
+}
+
+static bool handle_mmio_cfg_reg_redist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ struct kvm_vcpu *redist_vcpu = mmio->private;
+
+ u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
+ redist_vcpu->vcpu_id, offset >> 1);
+
+ return vgic_handle_cfg_reg(reg, mmio, offset);
+}
+
+static const struct kvm_mmio_range vgic_redist_sgi_ranges[] = {
+ {
+ .base = GICR_IGROUPR0,
+ .len = 0x04,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_rao_wi,
+ },
+ {
+ .base = GICR_ISENABLER0,
+ .len = 0x04,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_set_enable_reg_redist,
+ },
+ {
+ .base = GICR_ICENABLER0,
+ .len = 0x04,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_clear_enable_reg_redist,
+ },
+ {
+ .base = GICR_ISPENDR0,
+ .len = 0x04,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_set_pending_reg_redist,
+ },
+ {
+ .base = GICR_ICPENDR0,
+ .len = 0x04,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_clear_pending_reg_redist,
+ },
+ {
+ .base = GICR_ISACTIVER0,
+ .len = 0x04,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICR_ICACTIVER0,
+ .len = 0x04,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICR_IPRIORITYR0,
+ .len = 0x20,
+ .bits_per_irq = 8,
+ .handle_mmio = handle_mmio_priority_reg_redist,
+ },
+ {
+ .base = GICR_ICFGR0,
+ .len = 0x08,
+ .bits_per_irq = 2,
+ .handle_mmio = handle_mmio_cfg_reg_redist,
+ },
+ {
+ .base = GICR_IGRPMODR0,
+ .len = 0x04,
+ .bits_per_irq = 1,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICR_NSACR,
+ .len = 0x04,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {},
+};
+
+static bool handle_mmio_ctlr_redist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ /* since we don't support LPIs, this register is zero for now */
+ vgic_reg_access(mmio, NULL, offset,
+ ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+ return false;
+}
+
+static bool handle_mmio_typer_redist(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ u32 reg;
+ u64 mpidr;
+ struct kvm_vcpu *redist_vcpu = mmio->private;
+ int target_vcpu_id = redist_vcpu->vcpu_id;
+
+ /* the upper 32 bits contain the affinity value */
+ if ((offset & ~3) == 4) {
+ mpidr = kvm_vcpu_get_mpidr_aff(redist_vcpu);
+ reg = compress_mpidr(mpidr);
+
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+ return false;
+ }
+
+ reg = redist_vcpu->vcpu_id << 8;
+ if (target_vcpu_id == atomic_read(&vcpu->kvm->online_vcpus) - 1)
+ reg |= GICR_TYPER_LAST;
+ vgic_reg_access(mmio, ®, offset,
+ ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+ return false;
+}
+
+static const struct kvm_mmio_range vgic_redist_ranges[] = {
+ {
+ .base = GICR_CTLR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_ctlr_redist,
+ },
+ {
+ .base = GICR_TYPER,
+ .len = 0x08,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_typer_redist,
+ },
+ {
+ .base = GICR_IIDR,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_iidr,
+ },
+ {
+ .base = GICR_WAKER,
+ .len = 0x04,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_raz_wi,
+ },
+ {
+ .base = GICR_IDREGS,
+ .len = 0x30,
+ .bits_per_irq = 0,
+ .handle_mmio = handle_mmio_idregs,
+ },
+ {},
+};
+
+/*
+ * This function splits accesses between the distributor and the two
+ * redistributor parts (private/SPI). As each redistributor is accessible
+ * from any CPU, we have to determine the affected VCPU by taking the faulting
+ * address into account. We then pass this VCPU to the handler function via
+ * the private parameter.
+ */
+#define SGI_BASE_OFFSET SZ_64K
+static bool vgic_v3_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ struct kvm_exit_mmio *mmio)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ unsigned long dbase = dist->vgic_dist_base;
+ unsigned long rdbase = dist->vgic_redist_base;
+ int nrcpus = atomic_read(&vcpu->kvm->online_vcpus);
+ int vcpu_id;
+ const struct kvm_mmio_range *mmio_range;
+
+ if (is_in_range(mmio->phys_addr, mmio->len, dbase, GIC_V3_DIST_SIZE)) {
+ return vgic_handle_mmio_range(vcpu, run, mmio,
+ vgic_v3_dist_ranges, dbase);
+ }
+
+ if (!is_in_range(mmio->phys_addr, mmio->len, rdbase,
+ GIC_V3_REDIST_SIZE * nrcpus))
+ return false;
+
+ vcpu_id = (mmio->phys_addr - rdbase) / GIC_V3_REDIST_SIZE;
+ rdbase += (vcpu_id * GIC_V3_REDIST_SIZE);
+ mmio->private = kvm_get_vcpu(vcpu->kvm, vcpu_id);
+
+ if (mmio->phys_addr >= rdbase + SGI_BASE_OFFSET) {
+ rdbase += SGI_BASE_OFFSET;
+ mmio_range = vgic_redist_sgi_ranges;
+ } else {
+ mmio_range = vgic_redist_ranges;
+ }
+ return vgic_handle_mmio_range(vcpu, run, mmio, mmio_range, rdbase);
+}
+
+static bool vgic_v3_queue_sgi(struct kvm_vcpu *vcpu, int irq)
+{
+ if (vgic_queue_irq(vcpu, 0, irq)) {
+ vgic_dist_irq_clear_pending(vcpu, irq);
+ vgic_cpu_irq_clear(vcpu, irq);
+ return true;
+ }
+
+ return false;
+}
+
+static int vgic_v3_map_resources(struct kvm *kvm,
+ const struct vgic_params *params)
+{
+ int ret = 0;
+ struct vgic_dist *dist = &kvm->arch.vgic;
+
+ if (!irqchip_in_kernel(kvm))
+ return 0;
+
+ mutex_lock(&kvm->lock);
+
+ if (vgic_ready(kvm))
+ goto out;
+
+ if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base) ||
+ IS_VGIC_ADDR_UNDEF(dist->vgic_redist_base)) {
+ kvm_err("Need to set vgic distributor addresses first\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ /*
+ * For a VGICv3 we require the userland to explicitly initialize
+ * the VGIC before we need to use it.
+ */
+ if (!vgic_initialized(kvm)) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ kvm->arch.vgic.ready = true;
+out:
+ if (ret)
+ kvm_vgic_destroy(kvm);
+ mutex_unlock(&kvm->lock);
+ return ret;
+}
+
+static int vgic_v3_init_model(struct kvm *kvm)
+{
+ int i;
+ u32 mpidr;
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ int nr_spis = dist->nr_irqs - VGIC_NR_PRIVATE_IRQS;
+
+ dist->irq_spi_mpidr = kcalloc(nr_spis, sizeof(dist->irq_spi_mpidr[0]),
+ GFP_KERNEL);
+
+ if (!dist->irq_spi_mpidr)
+ return -ENOMEM;
+
+ /* Initialize the target VCPUs for each IRQ to VCPU 0 */
+ mpidr = compress_mpidr(kvm_vcpu_get_mpidr_aff(kvm_get_vcpu(kvm, 0)));
+ for (i = VGIC_NR_PRIVATE_IRQS; i < dist->nr_irqs; i++) {
+ dist->irq_spi_cpu[i - VGIC_NR_PRIVATE_IRQS] = 0;
+ dist->irq_spi_mpidr[i - VGIC_NR_PRIVATE_IRQS] = mpidr;
+ vgic_bitmap_set_irq_val(dist->irq_spi_target, 0, i, 1);
+ }
+
+ return 0;
+}
+
+/* GICv3 does not keep track of SGI sources anymore. */
+static void vgic_v3_add_sgi_source(struct kvm_vcpu *vcpu, int irq, int source)
+{
+}
+
+void vgic_v3_init_emulation(struct kvm *kvm)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+
+ dist->vm_ops.handle_mmio = vgic_v3_handle_mmio;
+ dist->vm_ops.queue_sgi = vgic_v3_queue_sgi;
+ dist->vm_ops.add_sgi_source = vgic_v3_add_sgi_source;
+ dist->vm_ops.init_model = vgic_v3_init_model;
+ dist->vm_ops.map_resources = vgic_v3_map_resources;
+
+ kvm->arch.max_vcpus = KVM_MAX_VCPUS;
+}
+
+static int vgic_v3_create(struct kvm_device *dev, u32 type)
+{
+ return kvm_vgic_create(dev->kvm, type);
+}
+
+static void vgic_v3_destroy(struct kvm_device *dev)
+{
+ kfree(dev);
+}
+
+static int vgic_v3_set_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ int ret;
+
+ ret = vgic_set_common_attr(dev, attr);
+ if (ret != -ENXIO)
+ return ret;
+
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+ case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+ return -ENXIO;
+ }
+
+ return -ENXIO;
+}
+
+static int vgic_v3_get_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ int ret;
+
+ ret = vgic_get_common_attr(dev, attr);
+ if (ret != -ENXIO)
+ return ret;
+
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+ case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+ return -ENXIO;
+ }
+
+ return -ENXIO;
+}
+
+static int vgic_v3_has_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_ADDR:
+ switch (attr->attr) {
+ case KVM_VGIC_V2_ADDR_TYPE_DIST:
+ case KVM_VGIC_V2_ADDR_TYPE_CPU:
+ return -ENXIO;
+ }
+ break;
+ case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+ case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+ return -ENXIO;
+ case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
+ return 0;
+ case KVM_DEV_ARM_VGIC_GRP_CTRL:
+ switch (attr->attr) {
+ case KVM_DEV_ARM_VGIC_CTRL_INIT:
+ return 0;
+ }
+ }
+ return -ENXIO;
+}
+
+struct kvm_device_ops kvm_arm_vgic_v3_ops = {
+ .name = "kvm-arm-vgic-v3",
+ .create = vgic_v3_create,
+ .destroy = vgic_v3_destroy,
+ .set_attr = vgic_v3_set_attr,
+ .get_attr = vgic_v3_get_attr,
+ .has_attr = vgic_v3_has_attr,
+};
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index b6e17c8..6d23e57 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1249,7 +1249,7 @@ static int vgic_update_irq_pending(struct kvm *kvm, int cpuid,
struct kvm_vcpu *vcpu;
int edge_triggered, level_triggered;
int enabled;
- bool ret = true;
+ bool ret = true, can_inject = true;
spin_lock(&dist->lock);
@@ -1264,6 +1264,11 @@ static int vgic_update_irq_pending(struct kvm *kvm, int cpuid,
if (irq_num >= VGIC_NR_PRIVATE_IRQS) {
cpuid = dist->irq_spi_cpu[irq_num - VGIC_NR_PRIVATE_IRQS];
+ if (cpuid == VCPU_NOT_ALLOCATED) {
+ /* Pretend we use CPU0, and prevent injection */
+ cpuid = 0;
+ can_inject = false;
+ }
vcpu = kvm_get_vcpu(kvm, cpuid);
}
@@ -1286,7 +1291,7 @@ static int vgic_update_irq_pending(struct kvm *kvm, int cpuid,
enabled = vgic_irq_is_enabled(vcpu, irq_num);
- if (!enabled) {
+ if (!enabled || !can_inject) {
ret = false;
goto out;
}
@@ -1439,6 +1444,7 @@ void kvm_vgic_destroy(struct kvm *kvm)
}
kfree(dist->irq_sgi_sources);
kfree(dist->irq_spi_cpu);
+ kfree(dist->irq_spi_mpidr);
kfree(dist->irq_spi_target);
kfree(dist->irq_pending_on_cpu);
dist->irq_sgi_sources = NULL;
@@ -1594,6 +1600,7 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
kvm->arch.vgic.vctrl_base = vgic->vctrl_base;
kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
+ kvm->arch.vgic.vgic_redist_base = VGIC_ADDR_UNDEF;
out_unlock:
for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
diff --git a/virt/kvm/arm/vgic.h b/virt/kvm/arm/vgic.h
index e363b93..1e83bdf 100644
--- a/virt/kvm/arm/vgic.h
+++ b/virt/kvm/arm/vgic.h
@@ -35,6 +35,8 @@
#define ACCESS_WRITE_VALUE (3 << 1)
#define ACCESS_WRITE_MASK(x) ((x) & (3 << 1))
+#define VCPU_NOT_ALLOCATED ((u8)-1)
+
unsigned long *vgic_bitmap_get_shared_map(struct vgic_bitmap *x);
void vgic_update_state(struct kvm *kvm);
@@ -116,5 +118,6 @@ int vgic_get_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr);
int vgic_init(struct kvm *kvm);
void vgic_v2_init_emulation(struct kvm *kvm);
+void vgic_v3_init_emulation(struct kvm *kvm);
#endif
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 30/36] arm64: GICv3: introduce symbolic names for GICv3 ICC_SGI1R_EL1 fields
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (28 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 29/36] arm/arm64: KVM: add virtual GICv3 distributor emulation Christoffer Dall
@ 2015-01-23 10:02 ` Christoffer Dall
2015-01-23 10:03 ` [GIT PULL 31/36] arm64: KVM: add SGI generation register emulation Christoffer Dall
` (5 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:02 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
The gic_send_sgi() function used hardcoded bit shift values to
generate the ICC_SGI1R_EL1 register value.
Replace this with symbolic names to allow reusing them later.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
drivers/irqchip/irq-gic-v3.c | 14 +++++++++-----
include/linux/irqchip/arm-gic-v3.h | 12 ++++++++++++
2 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 1a146cc..2ab290b 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -481,15 +481,19 @@ out:
return tlist;
}
+#define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
+ (MPIDR_AFFINITY_LEVEL(cluster_id, level) \
+ << ICC_SGI1R_AFFINITY_## level ##_SHIFT)
+
static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
{
u64 val;
- val = (MPIDR_AFFINITY_LEVEL(cluster_id, 3) << 48 |
- MPIDR_AFFINITY_LEVEL(cluster_id, 2) << 32 |
- irq << 24 |
- MPIDR_AFFINITY_LEVEL(cluster_id, 1) << 16 |
- tlist);
+ val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3) |
+ MPIDR_TO_SGI_AFFINITY(cluster_id, 2) |
+ irq << ICC_SGI1R_SGI_ID_SHIFT |
+ MPIDR_TO_SGI_AFFINITY(cluster_id, 1) |
+ tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
gic_write_sgi1r(val);
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 3fb4d85..800544b 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -280,6 +280,18 @@
#define ICC_SRE_EL2_SRE (1 << 0)
#define ICC_SRE_EL2_ENABLE (1 << 3)
+#define ICC_SGI1R_TARGET_LIST_SHIFT 0
+#define ICC_SGI1R_TARGET_LIST_MASK (0xffff << ICC_SGI1R_TARGET_LIST_SHIFT)
+#define ICC_SGI1R_AFFINITY_1_SHIFT 16
+#define ICC_SGI1R_AFFINITY_1_MASK (0xff << ICC_SGI1R_AFFINITY_1_SHIFT)
+#define ICC_SGI1R_SGI_ID_SHIFT 24
+#define ICC_SGI1R_SGI_ID_MASK (0xff << ICC_SGI1R_SGI_ID_SHIFT)
+#define ICC_SGI1R_AFFINITY_2_SHIFT 32
+#define ICC_SGI1R_AFFINITY_2_MASK (0xffULL << ICC_SGI1R_AFFINITY_1_SHIFT)
+#define ICC_SGI1R_IRQ_ROUTING_MODE_BIT 40
+#define ICC_SGI1R_AFFINITY_3_SHIFT 48
+#define ICC_SGI1R_AFFINITY_3_MASK (0xffULL << ICC_SGI1R_AFFINITY_1_SHIFT)
+
/*
* System register definitions
*/
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 31/36] arm64: KVM: add SGI generation register emulation
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (29 preceding siblings ...)
2015-01-23 10:02 ` [GIT PULL 30/36] arm64: GICv3: introduce symbolic names for GICv3 ICC_SGI1R_EL1 fields Christoffer Dall
@ 2015-01-23 10:03 ` Christoffer Dall
2015-01-23 10:03 ` [GIT PULL 32/36] arm/arm64: KVM: enable kernel side of GICv3 emulation Christoffer Dall
` (4 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:03 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
While the generation of a (virtual) inter-processor interrupt (SGI)
on a GICv2 works by writing to a MMIO register, GICv3 uses the system
register ICC_SGI1R_EL1 to trigger them.
Add a trap handler function that calls the new SGI register handler
in the GICv3 code. As ICC_SRE_EL1.SRE at this point is still always 0,
this will not trap yet, but will only be used later when all the data
structures have been initialized properly.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm64/kvm/sys_regs.c | 27 +++++++++++
include/kvm/arm_vgic.h | 1 +
virt/kvm/arm/vgic-v3-emul.c | 111 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 139 insertions(+)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 136e679..8c30f26 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -165,6 +165,27 @@ static bool access_sctlr(struct kvm_vcpu *vcpu,
return true;
}
+/*
+ * Trap handler for the GICv3 SGI generation system register.
+ * Forward the request to the VGIC emulation.
+ * The cp15_64 code makes sure this automatically works
+ * for both AArch64 and AArch32 accesses.
+ */
+static bool access_gic_sgi(struct kvm_vcpu *vcpu,
+ const struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 val;
+
+ if (!p->is_write)
+ return read_from_write_only(vcpu, p);
+
+ val = *vcpu_reg(vcpu, p->Rt);
+ vgic_v3_dispatch_sgi(vcpu, val);
+
+ return true;
+}
+
static bool trap_raz_wi(struct kvm_vcpu *vcpu,
const struct sys_reg_params *p,
const struct sys_reg_desc *r)
@@ -434,6 +455,9 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b0000), Op2(0b000),
NULL, reset_val, VBAR_EL1, 0 },
+ /* ICC_SGI1R_EL1 */
+ { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b1011), Op2(0b101),
+ access_gic_sgi },
/* ICC_SRE_EL1 */
{ Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b1100), Op2(0b101),
trap_raz_wi },
@@ -666,6 +690,8 @@ static const struct sys_reg_desc cp14_64_regs[] = {
* register).
*/
static const struct sys_reg_desc cp15_regs[] = {
+ { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi },
+
{ Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_sctlr, NULL, c1_SCTLR },
{ Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
{ Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 },
@@ -713,6 +739,7 @@ static const struct sys_reg_desc cp15_regs[] = {
static const struct sys_reg_desc cp15_64_regs[] = {
{ Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
+ { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi },
{ Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 },
};
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 98c3016..b9b2e05 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -307,6 +307,7 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
bool level);
+void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_exit_mmio *mmio);
diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
index 8db1db5..2d2199d 100644
--- a/virt/kvm/arm/vgic-v3-emul.c
+++ b/virt/kvm/arm/vgic-v3-emul.c
@@ -841,6 +841,117 @@ void vgic_v3_init_emulation(struct kvm *kvm)
kvm->arch.max_vcpus = KVM_MAX_VCPUS;
}
+/*
+ * Compare a given affinity (level 1-3 and a level 0 mask, from the SGI
+ * generation register ICC_SGI1R_EL1) with a given VCPU.
+ * If the VCPU's MPIDR matches, return the level0 affinity, otherwise
+ * return -1.
+ */
+static int match_mpidr(u64 sgi_aff, u16 sgi_cpu_mask, struct kvm_vcpu *vcpu)
+{
+ unsigned long affinity;
+ int level0;
+
+ /*
+ * Split the current VCPU's MPIDR into affinity level 0 and the
+ * rest as this is what we have to compare against.
+ */
+ affinity = kvm_vcpu_get_mpidr_aff(vcpu);
+ level0 = MPIDR_AFFINITY_LEVEL(affinity, 0);
+ affinity &= ~MPIDR_LEVEL_MASK;
+
+ /* bail out if the upper three levels don't match */
+ if (sgi_aff != affinity)
+ return -1;
+
+ /* Is this VCPU's bit set in the mask ? */
+ if (!(sgi_cpu_mask & BIT(level0)))
+ return -1;
+
+ return level0;
+}
+
+#define SGI_AFFINITY_LEVEL(reg, level) \
+ ((((reg) & ICC_SGI1R_AFFINITY_## level ##_MASK) \
+ >> ICC_SGI1R_AFFINITY_## level ##_SHIFT) << MPIDR_LEVEL_SHIFT(level))
+
+/**
+ * vgic_v3_dispatch_sgi - handle SGI requests from VCPUs
+ * @vcpu: The VCPU requesting a SGI
+ * @reg: The value written into the ICC_SGI1R_EL1 register by that VCPU
+ *
+ * With GICv3 (and ARE=1) CPUs trigger SGIs by writing to a system register.
+ * This will trap in sys_regs.c and call this function.
+ * This ICC_SGI1R_EL1 register contains the upper three affinity levels of the
+ * target processors as well as a bitmask of 16 Aff0 CPUs.
+ * If the interrupt routing mode bit is not set, we iterate over all VCPUs to
+ * check for matching ones. If this bit is set, we signal all, but not the
+ * calling VCPU.
+ */
+void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_vcpu *c_vcpu;
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ u16 target_cpus;
+ u64 mpidr;
+ int sgi, c;
+ int vcpu_id = vcpu->vcpu_id;
+ bool broadcast;
+ int updated = 0;
+
+ sgi = (reg & ICC_SGI1R_SGI_ID_MASK) >> ICC_SGI1R_SGI_ID_SHIFT;
+ broadcast = reg & BIT(ICC_SGI1R_IRQ_ROUTING_MODE_BIT);
+ target_cpus = (reg & ICC_SGI1R_TARGET_LIST_MASK) >> ICC_SGI1R_TARGET_LIST_SHIFT;
+ mpidr = SGI_AFFINITY_LEVEL(reg, 3);
+ mpidr |= SGI_AFFINITY_LEVEL(reg, 2);
+ mpidr |= SGI_AFFINITY_LEVEL(reg, 1);
+
+ /*
+ * We take the dist lock here, because we come from the sysregs
+ * code path and not from the MMIO one (which already takes the lock).
+ */
+ spin_lock(&dist->lock);
+
+ /*
+ * We iterate over all VCPUs to find the MPIDRs matching the request.
+ * If we have handled one CPU, we clear it's bit to detect early
+ * if we are already finished. This avoids iterating through all
+ * VCPUs when most of the times we just signal a single VCPU.
+ */
+ kvm_for_each_vcpu(c, c_vcpu, kvm) {
+
+ /* Exit early if we have dealt with all requested CPUs */
+ if (!broadcast && target_cpus == 0)
+ break;
+
+ /* Don't signal the calling VCPU */
+ if (broadcast && c == vcpu_id)
+ continue;
+
+ if (!broadcast) {
+ int level0;
+
+ level0 = match_mpidr(mpidr, target_cpus, c_vcpu);
+ if (level0 == -1)
+ continue;
+
+ /* remove this matching VCPU from the mask */
+ target_cpus &= ~BIT(level0);
+ }
+
+ /* Flag the SGI as pending */
+ vgic_dist_irq_set_pending(c_vcpu, sgi);
+ updated = 1;
+ kvm_debug("SGI%d from CPU%d to CPU%d\n", sgi, vcpu_id, c);
+ }
+ if (updated)
+ vgic_update_state(vcpu->kvm);
+ spin_unlock(&dist->lock);
+ if (updated)
+ vgic_kick_vcpus(vcpu->kvm);
+}
+
static int vgic_v3_create(struct kvm_device *dev, u32 type)
{
return kvm_vgic_create(dev->kvm, type);
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 32/36] arm/arm64: KVM: enable kernel side of GICv3 emulation
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (30 preceding siblings ...)
2015-01-23 10:03 ` [GIT PULL 31/36] arm64: KVM: add SGI generation register emulation Christoffer Dall
@ 2015-01-23 10:03 ` Christoffer Dall
2015-01-23 10:03 ` [GIT PULL 33/36] arm/arm64: KVM: allow userland to request a virtual GICv3 Christoffer Dall
` (3 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:03 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
With all the necessary GICv3 emulation code in place, we can now
connect the code to the GICv3 backend in the kernel.
The LR register handling is different depending on the emulated GIC
model, so provide different implementations for each.
Also allow non-v2-compatible GICv3 implementations (which don't
provide MMIO regions for the virtual CPU interface in the DT), but
restrict those hosts to support GICv3 guests only.
If the device tree provides a GICv2 compatible GICV resource entry,
but that one is faulty, just disable the GICv2 emulation and let the
user use at least the GICv3 emulation for guests.
To provide proper support for the legacy KVM_CREATE_IRQCHIP ioctl,
note virtual GICv2 compatibility in struct vgic_params and use it
on creating a VGICv2.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
include/kvm/arm_vgic.h | 2 ++
virt/kvm/arm/vgic-v2.c | 1 +
virt/kvm/arm/vgic-v3.c | 76 +++++++++++++++++++++++++++++++++-----------------
virt/kvm/arm/vgic.c | 14 ++++++++++
4 files changed, 68 insertions(+), 25 deletions(-)
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index b9b2e05..39039d5 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -134,6 +134,8 @@ struct vgic_params {
/* Virtual control interface base address */
void __iomem *vctrl_base;
int max_gic_vcpus;
+ /* Only needed for the legacy KVM_CREATE_IRQCHIP */
+ bool can_emulate_gicv2;
};
struct vgic_vm_ops {
diff --git a/virt/kvm/arm/vgic-v2.c b/virt/kvm/arm/vgic-v2.c
index e8b82b2..a0a7b5d 100644
--- a/virt/kvm/arm/vgic-v2.c
+++ b/virt/kvm/arm/vgic-v2.c
@@ -229,6 +229,7 @@ int vgic_v2_probe(struct device_node *vgic_node,
goto out_unmap;
}
+ vgic->can_emulate_gicv2 = true;
kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2);
vgic->vcpu_base = vcpu_res.start;
diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c
index 5249048..3a62d8a 100644
--- a/virt/kvm/arm/vgic-v3.c
+++ b/virt/kvm/arm/vgic-v3.c
@@ -34,6 +34,7 @@
#define GICH_LR_VIRTUALID (0x3ffUL << 0)
#define GICH_LR_PHYSID_CPUID_SHIFT (10)
#define GICH_LR_PHYSID_CPUID (7UL << GICH_LR_PHYSID_CPUID_SHIFT)
+#define ICH_LR_VIRTUALID_MASK (BIT_ULL(32) - 1)
/*
* LRs are stored in reverse order in memory. make sure we index them
@@ -48,12 +49,17 @@ static struct vgic_lr vgic_v3_get_lr(const struct kvm_vcpu *vcpu, int lr)
struct vgic_lr lr_desc;
u64 val = vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[LR_INDEX(lr)];
- lr_desc.irq = val & GICH_LR_VIRTUALID;
- if (lr_desc.irq <= 15)
- lr_desc.source = (val >> GICH_LR_PHYSID_CPUID_SHIFT) & 0x7;
+ if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
+ lr_desc.irq = val & ICH_LR_VIRTUALID_MASK;
else
- lr_desc.source = 0;
- lr_desc.state = 0;
+ lr_desc.irq = val & GICH_LR_VIRTUALID;
+
+ lr_desc.source = 0;
+ if (lr_desc.irq <= 15 &&
+ vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
+ lr_desc.source = (val >> GICH_LR_PHYSID_CPUID_SHIFT) & 0x7;
+
+ lr_desc.state = 0;
if (val & ICH_LR_PENDING_BIT)
lr_desc.state |= LR_STATE_PENDING;
@@ -68,8 +74,20 @@ static struct vgic_lr vgic_v3_get_lr(const struct kvm_vcpu *vcpu, int lr)
static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr,
struct vgic_lr lr_desc)
{
- u64 lr_val = (((u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT) |
- lr_desc.irq);
+ u64 lr_val;
+
+ lr_val = lr_desc.irq;
+
+ /*
+ * Currently all guest IRQs are Group1, as Group0 would result
+ * in a FIQ in the guest, which it wouldn't expect.
+ * Eventually we want to make this configurable, so we may revisit
+ * this in the future.
+ */
+ if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
+ lr_val |= ICH_LR_GROUP;
+ else
+ lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT;
if (lr_desc.state & LR_STATE_PENDING)
lr_val |= ICH_LR_PENDING_BIT;
@@ -154,7 +172,15 @@ static void vgic_v3_enable(struct kvm_vcpu *vcpu)
*/
vgic_v3->vgic_vmcr = 0;
- vgic_v3->vgic_sre = 0;
+ /*
+ * If we are emulating a GICv3, we do it in an non-GICv2-compatible
+ * way, so we force SRE to 1 to demonstrate this to the guest.
+ * This goes with the spec allowing the value to be RAO/WI.
+ */
+ if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
+ vgic_v3->vgic_sre = ICC_SRE_EL1_SRE;
+ else
+ vgic_v3->vgic_sre = 0;
/* Get the show on the road... */
vgic_v3->vgic_hcr = ICH_HCR_EN;
@@ -209,34 +235,34 @@ int vgic_v3_probe(struct device_node *vgic_node,
* maximum of 16 list registers. Just ignore bit 4...
*/
vgic->nr_lr = (ich_vtr_el2 & 0xf) + 1;
+ vgic->can_emulate_gicv2 = false;
if (of_property_read_u32(vgic_node, "#redistributor-regions", &gicv_idx))
gicv_idx = 1;
gicv_idx += 3; /* Also skip GICD, GICC, GICH */
if (of_address_to_resource(vgic_node, gicv_idx, &vcpu_res)) {
- kvm_err("Cannot obtain GICV region\n");
- ret = -ENXIO;
- goto out;
- }
-
- if (!PAGE_ALIGNED(vcpu_res.start)) {
- kvm_err("GICV physical address 0x%llx not page aligned\n",
+ kvm_info("GICv3: no GICV resource entry\n");
+ vgic->vcpu_base = 0;
+ } else if (!PAGE_ALIGNED(vcpu_res.start)) {
+ pr_warn("GICV physical address 0x%llx not page aligned\n",
(unsigned long long)vcpu_res.start);
- ret = -ENXIO;
- goto out;
- }
-
- if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
- kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n",
+ vgic->vcpu_base = 0;
+ } else if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
+ pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n",
(unsigned long long)resource_size(&vcpu_res),
PAGE_SIZE);
- ret = -ENXIO;
- goto out;
+ vgic->vcpu_base = 0;
+ } else {
+ vgic->vcpu_base = vcpu_res.start;
+ vgic->can_emulate_gicv2 = true;
+ kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
+ KVM_DEV_TYPE_ARM_VGIC_V2);
}
- kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2);
+ if (vgic->vcpu_base == 0)
+ kvm_info("disabling GICv2 emulation\n");
+ kvm_register_device_ops(&kvm_arm_vgic_v3_ops, KVM_DEV_TYPE_ARM_VGIC_V3);
- vgic->vcpu_base = vcpu_res.start;
vgic->vctrl_base = NULL;
vgic->type = VGIC_V3;
vgic->max_gic_vcpus = KVM_MAX_VCPUS;
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 6d23e57..2efba82 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1550,6 +1550,11 @@ static int init_vgic_model(struct kvm *kvm, int type)
case KVM_DEV_TYPE_ARM_VGIC_V2:
vgic_v2_init_emulation(kvm);
break;
+#ifdef CONFIG_ARM_GIC_V3
+ case KVM_DEV_TYPE_ARM_VGIC_V3:
+ vgic_v3_init_emulation(kvm);
+ break;
+#endif
default:
return -ENODEV;
}
@@ -1573,6 +1578,15 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
}
/*
+ * This function is also called by the KVM_CREATE_IRQCHIP handler,
+ * which had no chance yet to check the availability of the GICv2
+ * emulation. So check this here again. KVM_CREATE_DEVICE does
+ * the proper checks already.
+ */
+ if (type == KVM_DEV_TYPE_ARM_VGIC_V2 && !vgic->can_emulate_gicv2)
+ return -ENODEV;
+
+ /*
* Any time a vcpu is run, vcpu_load is called which tries to grab the
* vcpu->mutex. By grabbing the vcpu->mutex of all VCPUs we ensure
* that no other VCPUs are run while we create the vgic.
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 33/36] arm/arm64: KVM: allow userland to request a virtual GICv3
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (31 preceding siblings ...)
2015-01-23 10:03 ` [GIT PULL 32/36] arm/arm64: KVM: enable kernel side of GICv3 emulation Christoffer Dall
@ 2015-01-23 10:03 ` Christoffer Dall
2015-01-23 10:03 ` [GIT PULL 34/36] arm/arm64: KVM: force alignment of VGIC dist/CPU/redist addresses Christoffer Dall
` (2 subsequent siblings)
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:03 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
With all of the GICv3 code in place now we allow userland to ask the
kernel for using a virtual GICv3 in the guest.
Also we provide the necessary support for guests setting the memory
addresses for the virtual distributor and redistributors.
This requires some userland code to make use of that feature and
explicitly ask for a virtual GICv3.
Document that KVM_CREATE_IRQCHIP only works for GICv2, but is
considered legacy and using KVM_CREATE_DEVICE is preferred.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
Documentation/virtual/kvm/api.txt | 13 +++++---
Documentation/virtual/kvm/devices/arm-vgic.txt | 22 ++++++++++--
arch/arm64/include/uapi/asm/kvm.h | 7 ++++
include/kvm/arm_vgic.h | 4 +--
virt/kvm/arm/vgic-v3-emul.c | 3 ++
virt/kvm/arm/vgic.c | 46 ++++++++++++++++++--------
6 files changed, 73 insertions(+), 22 deletions(-)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 0007fef..f4b19d7 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -612,11 +612,14 @@ Type: vm ioctl
Parameters: none
Returns: 0 on success, -1 on error
-Creates an interrupt controller model in the kernel. On x86, creates a virtual
-ioapic, a virtual PIC (two PICs, nested), and sets up future vcpus to have a
-local APIC. IRQ routing for GSIs 0-15 is set to both PIC and IOAPIC; GSI 16-23
-only go to the IOAPIC. On ARM/arm64, a GIC is
-created. On s390, a dummy irq routing table is created.
+Creates an interrupt controller model in the kernel.
+On x86, creates a virtual ioapic, a virtual PIC (two PICs, nested), and sets up
+future vcpus to have a local APIC. IRQ routing for GSIs 0-15 is set to both
+PIC and IOAPIC; GSI 16-23 only go to the IOAPIC.
+On ARM/arm64, a GICv2 is created. Any other GIC versions require the usage of
+KVM_CREATE_DEVICE, which also supports creating a GICv2. Using
+KVM_CREATE_DEVICE is preferred over KVM_CREATE_IRQCHIP for GICv2.
+On s390, a dummy irq routing table is created.
Note that on s390 the KVM_CAP_S390_IRQCHIP vm capability needs to be enabled
before KVM_CREATE_IRQCHIP can be used.
diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt
index 30f5427..5d4fd4b 100644
--- a/Documentation/virtual/kvm/devices/arm-vgic.txt
+++ b/Documentation/virtual/kvm/devices/arm-vgic.txt
@@ -3,22 +3,38 @@ ARM Virtual Generic Interrupt Controller (VGIC)
Device types supported:
KVM_DEV_TYPE_ARM_VGIC_V2 ARM Generic Interrupt Controller v2.0
+ KVM_DEV_TYPE_ARM_VGIC_V3 ARM Generic Interrupt Controller v3.0
Only one VGIC instance may be instantiated through either this API or the
legacy KVM_CREATE_IRQCHIP api. The created VGIC will act as the VM interrupt
controller, requiring emulated user-space devices to inject interrupts to the
VGIC instead of directly to CPUs.
+Creating a guest GICv3 device requires a host GICv3 as well.
+GICv3 implementations with hardware compatibility support allow a guest GICv2
+as well.
+
Groups:
KVM_DEV_ARM_VGIC_GRP_ADDR
Attributes:
KVM_VGIC_V2_ADDR_TYPE_DIST (rw, 64-bit)
Base address in the guest physical address space of the GIC distributor
- register mappings.
+ register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V2.
KVM_VGIC_V2_ADDR_TYPE_CPU (rw, 64-bit)
Base address in the guest physical address space of the GIC virtual cpu
- interface register mappings.
+ interface register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V2.
+
+ KVM_VGIC_V3_ADDR_TYPE_DIST (rw, 64-bit)
+ Base address in the guest physical address space of the GICv3 distributor
+ register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
+
+ KVM_VGIC_V3_ADDR_TYPE_REDIST (rw, 64-bit)
+ Base address in the guest physical address space of the GICv3
+ redistributor register mappings. There are two 64K pages for each
+ VCPU and all of the redistributor pages are contiguous.
+ Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
+
KVM_DEV_ARM_VGIC_GRP_DIST_REGS
Attributes:
@@ -36,6 +52,7 @@ Groups:
the register.
Limitations:
- Priorities are not implemented, and registers are RAZ/WI
+ - Currently only implemented for KVM_DEV_TYPE_ARM_VGIC_V2.
Errors:
-ENODEV: Getting or setting this register is not yet supported
-EBUSY: One or more VCPUs are running
@@ -68,6 +85,7 @@ Groups:
Limitations:
- Priorities are not implemented, and registers are RAZ/WI
+ - Currently only implemented for KVM_DEV_TYPE_ARM_VGIC_V2.
Errors:
-ENODEV: Getting or setting this register is not yet supported
-EBUSY: One or more VCPUs are running
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 480af34..3ef77a4 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -78,6 +78,13 @@ struct kvm_regs {
#define KVM_VGIC_V2_DIST_SIZE 0x1000
#define KVM_VGIC_V2_CPU_SIZE 0x2000
+/* Supported VGICv3 address types */
+#define KVM_VGIC_V3_ADDR_TYPE_DIST 2
+#define KVM_VGIC_V3_ADDR_TYPE_REDIST 3
+
+#define KVM_VGIC_V3_DIST_SIZE SZ_64K
+#define KVM_VGIC_V3_REDIST_SIZE (2 * SZ_64K)
+
#define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
#define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */
#define KVM_ARM_VCPU_PSCI_0_2 2 /* CPU uses PSCI v0.2 */
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 39039d5..7c55dd5 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -36,8 +36,8 @@
#define VGIC_V2_MAX_CPUS 8
/* Sanity checks... */
-#if (KVM_MAX_VCPUS > 8)
-#error Invalid number of CPU interfaces
+#if (KVM_MAX_VCPUS > 255)
+#error Too many KVM VCPUs, the VGIC only supports up to 255 VCPUs for now
#endif
#if (VGIC_NR_IRQS_LEGACY & 31)
diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
index 2d2199d..b3f1546 100644
--- a/virt/kvm/arm/vgic-v3-emul.c
+++ b/virt/kvm/arm/vgic-v3-emul.c
@@ -1007,6 +1007,9 @@ static int vgic_v3_has_attr(struct kvm_device *dev,
case KVM_VGIC_V2_ADDR_TYPE_DIST:
case KVM_VGIC_V2_ADDR_TYPE_CPU:
return -ENXIO;
+ case KVM_VGIC_V3_ADDR_TYPE_DIST:
+ case KVM_VGIC_V3_ADDR_TYPE_REDIST:
+ return 0;
}
break;
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 2efba82..184c6db 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1667,7 +1667,7 @@ static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
/**
* kvm_vgic_addr - set or get vgic VM base addresses
* @kvm: pointer to the vm struct
- * @type: the VGIC addr type, one of KVM_VGIC_V2_ADDR_TYPE_XXX
+ * @type: the VGIC addr type, one of KVM_VGIC_V[23]_ADDR_TYPE_XXX
* @addr: pointer to address value
* @write: if true set the address in the VM address space, if false read the
* address
@@ -1681,29 +1681,49 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
{
int r = 0;
struct vgic_dist *vgic = &kvm->arch.vgic;
+ int type_needed;
+ phys_addr_t *addr_ptr, block_size;
mutex_lock(&kvm->lock);
switch (type) {
case KVM_VGIC_V2_ADDR_TYPE_DIST:
- if (write) {
- r = vgic_ioaddr_assign(kvm, &vgic->vgic_dist_base,
- *addr, KVM_VGIC_V2_DIST_SIZE);
- } else {
- *addr = vgic->vgic_dist_base;
- }
+ type_needed = KVM_DEV_TYPE_ARM_VGIC_V2;
+ addr_ptr = &vgic->vgic_dist_base;
+ block_size = KVM_VGIC_V2_DIST_SIZE;
break;
case KVM_VGIC_V2_ADDR_TYPE_CPU:
- if (write) {
- r = vgic_ioaddr_assign(kvm, &vgic->vgic_cpu_base,
- *addr, KVM_VGIC_V2_CPU_SIZE);
- } else {
- *addr = vgic->vgic_cpu_base;
- }
+ type_needed = KVM_DEV_TYPE_ARM_VGIC_V2;
+ addr_ptr = &vgic->vgic_cpu_base;
+ block_size = KVM_VGIC_V2_CPU_SIZE;
break;
+#ifdef CONFIG_ARM_GIC_V3
+ case KVM_VGIC_V3_ADDR_TYPE_DIST:
+ type_needed = KVM_DEV_TYPE_ARM_VGIC_V3;
+ addr_ptr = &vgic->vgic_dist_base;
+ block_size = KVM_VGIC_V3_DIST_SIZE;
+ break;
+ case KVM_VGIC_V3_ADDR_TYPE_REDIST:
+ type_needed = KVM_DEV_TYPE_ARM_VGIC_V3;
+ addr_ptr = &vgic->vgic_redist_base;
+ block_size = KVM_VGIC_V3_REDIST_SIZE;
+ break;
+#endif
default:
r = -ENODEV;
+ goto out;
+ }
+
+ if (vgic->vgic_model != type_needed) {
+ r = -ENODEV;
+ goto out;
}
+ if (write)
+ r = vgic_ioaddr_assign(kvm, addr_ptr, *addr, block_size);
+ else
+ *addr = *addr_ptr;
+
+out:
mutex_unlock(&kvm->lock);
return r;
}
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 34/36] arm/arm64: KVM: force alignment of VGIC dist/CPU/redist addresses
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (32 preceding siblings ...)
2015-01-23 10:03 ` [GIT PULL 33/36] arm/arm64: KVM: allow userland to request a virtual GICv3 Christoffer Dall
@ 2015-01-23 10:03 ` Christoffer Dall
2015-01-23 10:03 ` [GIT PULL 35/36] arm/arm64: KVM: Fixup incorrect config symbol in comment Christoffer Dall
2015-01-23 10:03 ` [GIT PULL 36/36] KVM: Remove unused config symbol Christoffer Dall
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:03 UTC (permalink / raw)
To: linux-arm-kernel
From: Andre Przywara <andre.przywara@arm.com>
Although the GIC architecture requires us to map the MMIO regions
only at page aligned addresses, we currently do not enforce this from
the kernel side.
Restrict any vGICv2 regions to be 4K aligned and any GICv3 regions
to be 64K aligned. Document this requirement.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
Documentation/virtual/kvm/devices/arm-vgic.txt | 4 ++++
virt/kvm/arm/vgic.c | 16 +++++++++++++---
2 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt
index 5d4fd4b..3fb9054 100644
--- a/Documentation/virtual/kvm/devices/arm-vgic.txt
+++ b/Documentation/virtual/kvm/devices/arm-vgic.txt
@@ -20,20 +20,24 @@ Groups:
KVM_VGIC_V2_ADDR_TYPE_DIST (rw, 64-bit)
Base address in the guest physical address space of the GIC distributor
register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V2.
+ This address needs to be 4K aligned and the region covers 4 KByte.
KVM_VGIC_V2_ADDR_TYPE_CPU (rw, 64-bit)
Base address in the guest physical address space of the GIC virtual cpu
interface register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V2.
+ This address needs to be 4K aligned and the region covers 4 KByte.
KVM_VGIC_V3_ADDR_TYPE_DIST (rw, 64-bit)
Base address in the guest physical address space of the GICv3 distributor
register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
+ This address needs to be 64K aligned and the region covers 64 KByte.
KVM_VGIC_V3_ADDR_TYPE_REDIST (rw, 64-bit)
Base address in the guest physical address space of the GICv3
redistributor register mappings. There are two 64K pages for each
VCPU and all of the redistributor pages are contiguous.
Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
+ This address needs to be 64K aligned.
KVM_DEV_ARM_VGIC_GRP_DIST_REGS
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 184c6db..0cc6ab6 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1683,6 +1683,7 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
struct vgic_dist *vgic = &kvm->arch.vgic;
int type_needed;
phys_addr_t *addr_ptr, block_size;
+ phys_addr_t alignment;
mutex_lock(&kvm->lock);
switch (type) {
@@ -1690,22 +1691,26 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
type_needed = KVM_DEV_TYPE_ARM_VGIC_V2;
addr_ptr = &vgic->vgic_dist_base;
block_size = KVM_VGIC_V2_DIST_SIZE;
+ alignment = SZ_4K;
break;
case KVM_VGIC_V2_ADDR_TYPE_CPU:
type_needed = KVM_DEV_TYPE_ARM_VGIC_V2;
addr_ptr = &vgic->vgic_cpu_base;
block_size = KVM_VGIC_V2_CPU_SIZE;
+ alignment = SZ_4K;
break;
#ifdef CONFIG_ARM_GIC_V3
case KVM_VGIC_V3_ADDR_TYPE_DIST:
type_needed = KVM_DEV_TYPE_ARM_VGIC_V3;
addr_ptr = &vgic->vgic_dist_base;
block_size = KVM_VGIC_V3_DIST_SIZE;
+ alignment = SZ_64K;
break;
case KVM_VGIC_V3_ADDR_TYPE_REDIST:
type_needed = KVM_DEV_TYPE_ARM_VGIC_V3;
addr_ptr = &vgic->vgic_redist_base;
block_size = KVM_VGIC_V3_REDIST_SIZE;
+ alignment = SZ_64K;
break;
#endif
default:
@@ -1718,10 +1723,15 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
goto out;
}
- if (write)
- r = vgic_ioaddr_assign(kvm, addr_ptr, *addr, block_size);
- else
+ if (write) {
+ if (!IS_ALIGNED(*addr, alignment))
+ r = -EINVAL;
+ else
+ r = vgic_ioaddr_assign(kvm, addr_ptr, *addr,
+ block_size);
+ } else {
*addr = *addr_ptr;
+ }
out:
mutex_unlock(&kvm->lock);
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 35/36] arm/arm64: KVM: Fixup incorrect config symbol in comment
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (33 preceding siblings ...)
2015-01-23 10:03 ` [GIT PULL 34/36] arm/arm64: KVM: force alignment of VGIC dist/CPU/redist addresses Christoffer Dall
@ 2015-01-23 10:03 ` Christoffer Dall
2015-01-23 10:03 ` [GIT PULL 36/36] KVM: Remove unused config symbol Christoffer Dall
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:03 UTC (permalink / raw)
To: linux-arm-kernel
A comment in the dirty page logging patch series mentioned incorrectly
spelled config symbols, just fix them up to match the real thing.
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
arch/arm/kvm/mmu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index eb94597..74aeaba 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1042,8 +1042,8 @@ static void stage2_wp_range(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
/*
* Release kvm_mmu_lock periodically if the memory region is
* large. Otherwise, we may see kernel panics with
- * CONFIG_DETECT_HUNG_TASK, CONFIG_LOCK_DETECTOR,
- * CONFIG_LOCK_DEP. Additionally, holding the lock too long
+ * CONFIG_DETECT_HUNG_TASK, CONFIG_LOCKUP_DETECTOR,
+ * CONFIG_LOCKDEP. Additionally, holding the lock too long
* will also starve other vCPUs.
*/
if (need_resched() || spin_needbreak(&kvm->mmu_lock))
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread* [GIT PULL 36/36] KVM: Remove unused config symbol
2015-01-23 10:02 [GIT PULL 00/36] KVM/ARM changes for 3.20 Christoffer Dall
` (34 preceding siblings ...)
2015-01-23 10:03 ` [GIT PULL 35/36] arm/arm64: KVM: Fixup incorrect config symbol in comment Christoffer Dall
@ 2015-01-23 10:03 ` Christoffer Dall
35 siblings, 0 replies; 42+ messages in thread
From: Christoffer Dall @ 2015-01-23 10:03 UTC (permalink / raw)
To: linux-arm-kernel
The dirty patch logging series introduced both
HAVE_KVM_ARCH_DIRTY_LOG_PROTECT and KVM_GENERIC_DIRTYLOG_READ_PROTECT
config symbols, but only KVM_GENERIC_DIRTYLOG_READ_PROTECT is used.
Just remove the unused one.
(The config symbol was renamed during the development of the patch
series and the old name just creeped in by accident.()
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
virt/kvm/Kconfig | 3 ---
1 file changed, 3 deletions(-)
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 314950c..50d1106 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -41,8 +41,5 @@ config KVM_VFIO
config HAVE_KVM_ARCH_TLB_FLUSH_ALL
bool
-config HAVE_KVM_ARCH_DIRTY_LOG_PROTECT
- bool
-
config KVM_GENERIC_DIRTYLOG_READ_PROTECT
bool
--
2.1.2.330.g565301e.dirty
^ permalink raw reply related [flat|nested] 42+ messages in thread