[PATCH v3 11/15] arm64: kvm: Split hyp/timer-sr.c to VHE/nVHE

David Brazdil
2020-06-18T12:29:03Z

This patch is part of a series which builds KVM's non-VHE hyp code separately
from VHE and the rest of the kernel.

timer-sr.c contains a HVC handler for setting CNTVOFF_EL2 and two helper
functions for controlling access to physical counter. The former is shared
between VHE/nVHE and is kept in timer-sr.c but compiled under both configs.
The latter are nVHE-specific and are moved to nvhe/timer-sr.c.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
arch/arm64/include/asm/kvm_hyp.h | 2 ++
arch/arm64/kernel/image-vars.h | 3 ---
arch/arm64/kvm/hyp/nvhe/Makefile | 3 ++-
arch/arm64/kvm/hyp/nvhe/timer-sr.c | 43 ++++++++++++++++++++++++++++++
arch/arm64/kvm/hyp/timer-sr.c | 36 -------------------------
5 files changed, 47 insertions(+), 40 deletions(-)
create mode 100644 arch/arm64/kvm/hyp/nvhe/timer-sr.c

diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index c8bbd221aac0..8a1510f521fe 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -63,8 +63,10 @@ void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if);
int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);

+#ifdef __KVM_NVHE_HYPERVISOR__
void __timer_enable_traps(struct kvm_vcpu *vcpu);
void __timer_disable_traps(struct kvm_vcpu *vcpu);
+#endif

#ifdef __KVM_NVHE_HYPERVISOR__
void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index ddaae7267ab1..94bfc61b3f51 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -68,9 +68,6 @@ __kvm_nvhe___guest_exit = __guest_exit;
__kvm_nvhe___hyp_panic_string = __hyp_panic_string;
__kvm_nvhe___hyp_stub_vectors = __hyp_stub_vectors;
__kvm_nvhe___icache_flags = __icache_flags;
-__kvm_nvhe___kvm_timer_set_cntvoff = __kvm_timer_set_cntvoff;
-__kvm_nvhe___timer_disable_traps = __timer_disable_traps;
-__kvm_nvhe___timer_enable_traps = __timer_enable_traps;
__kvm_nvhe___vgic_v2_perform_cpuif_access = __vgic_v2_perform_cpuif_access;
__kvm_nvhe___vgic_v3_activate_traps = __vgic_v3_activate_traps;
__kvm_nvhe___vgic_v3_deactivate_traps = __vgic_v3_deactivate_traps;
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index d242e437cf89..4ec34abce0a9 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -7,7 +7,8 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -fno-stack-protector \
-DDISABLE_BRANCH_PROFILING $(DISABLE_STACKLEAK_PLUGIN)

-obj-y := sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o ../hyp-entry.o
+obj-y := ../timer-sr.o timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o \
+ hyp-init.o ../hyp-entry.o

obj-y := $(patsubst %.o,%.hyp.o,$(obj-y))
extra-y := $(patsubst %.hyp.o,%.hyp.tmp.o,$(obj-y))
diff --git a/arch/arm64/kvm/hyp/nvhe/timer-sr.c b/arch/arm64/kvm/hyp/nvhe/timer-sr.c
new file mode 100644
index 000000000000..f0e694743883
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/timer-sr.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <clocksource/arm_arch_timer.h>
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_hyp.h>
+
+/*
+ * Should only be called on non-VHE systems.
+ * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
+ */
+void __hyp_text __timer_disable_traps(struct kvm_vcpu *vcpu)
+{
+ u64 val;
+
+ /* Allow physical timer/counter access for the host */
+ val = read_sysreg(cnthctl_el2);
+ val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
+ write_sysreg(val, cnthctl_el2);
+}
+
+/*
+ * Should only be called on non-VHE systems.
+ * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
+ */
+void __hyp_text __timer_enable_traps(struct kvm_vcpu *vcpu)
+{
+ u64 val;
+
+ /*
+ * Disallow physical timer access for the guest
+ * Physical counter access is allowed
+ */
+ val = read_sysreg(cnthctl_el2);
+ val &= ~CNTHCTL_EL1PCEN;
+ val |= CNTHCTL_EL1PCTEN;
+ write_sysreg(val, cnthctl_el2);
+}
diff --git a/arch/arm64/kvm/hyp/timer-sr.c b/arch/arm64/kvm/hyp/timer-sr.c
index fb5c0be33223..6c620d807857 100644
--- a/arch/arm64/kvm/hyp/timer-sr.c
+++ b/arch/arm64/kvm/hyp/timer-sr.c
@@ -4,45 +4,9 @@
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/

-#include <clocksource/arm_arch_timer.h>
-#include <linux/compiler.h>
-#include <linux/kvm_host.h>
-
#include <asm/kvm_hyp.h>

void __hyp_text __kvm_timer_set_cntvoff(u64 cntvoff)
{
write_sysreg(cntvoff, cntvoff_el2);
}
-
-/*
- * Should only be called on non-VHE systems.
- * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
- */
-void __hyp_text __timer_disable_traps(struct kvm_vcpu *vcpu)
-{
- u64 val;
-
- /* Allow physical timer/counter access for the host */
- val = read_sysreg(cnthctl_el2);
- val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
- write_sysreg(val, cnthctl_el2);
-}
-
-/*
- * Should only be called on non-VHE systems.
- * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
- */
-void __hyp_text __timer_enable_traps(struct kvm_vcpu *vcpu)
-{
- u64 val;
-
- /*
- * Disallow physical timer access for the guest
- * Physical counter access is allowed
- */
- val = read_sysreg(cnthctl_el2);
- val &= ~CNTHCTL_EL1PCEN;
- val |= CNTHCTL_EL1PCTEN;
- write_sysreg(val, cnthctl_el2);
-}
--
2.27.0