[PATCH v2 4/8] KVM: arm/arm64: vgic: restructure kvm_vgic_(un)map_phys_irq

Eric Auger
2017-06-15T12:50:32Z

We want to reuse the core of the map/unmap functions for IRQ
forwarding. Let's move the computation of the hwirq in
kvm_vgic_map_phys_irq and pass the linux IRQ as parameter.
the host_irq is added to struct vgic_irq.

We introduce kvm_vgic_map/unmap_irq which take a struct vgic_irq
handle as a parameter.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
include/kvm/arm_vgic.h | 8 ++++---
virt/kvm/arm/arch_timer.c | 24 +------------------
virt/kvm/arm/vgic/vgic.c | 60 +++++++++++++++++++++++++++++++++++------------
3 files changed, 51 insertions(+), 41 deletions(-)

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index ef71858..cceb31d 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -112,6 +112,7 @@ struct vgic_irq {
bool hw; /* Tied to HW IRQ */
struct kref refcount; /* Used for LPIs */
u32 hwintid; /* HW INTID number */
+ unsigned int host_irq; /* linux irq corresponding to hwintid */
union {
u8 targets; /* GICv2 target VCPUs mask */
u32 mpidr; /* GICv3 target VCPU */
@@ -301,9 +302,10 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
bool level);
int kvm_vgic_inject_mapped_irq(struct kvm *kvm, int cpuid, unsigned int intid,
bool level);
-int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, u32 virt_irq, u32 phys_irq);
-int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq);
-bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq);
+int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
+ u32 vintid);
+int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid);
+bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid);

int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);

diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 5976609..57a30ab 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -617,9 +617,6 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
- struct irq_desc *desc;
- struct irq_data *data;
- int phys_irq;
int ret;

if (timer->enabled)
@@ -632,26 +629,7 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
if (!vgic_initialized(vcpu->kvm))
return -ENODEV;

- /*
- * Find the physical IRQ number corresponding to the host_vtimer_irq
- */
- desc = irq_to_desc(host_vtimer_irq);
- if (!desc) {
- kvm_err("%s: no interrupt descriptor\n", __func__);
- return -EINVAL;
- }
-
- data = irq_desc_get_irq_data(desc);
- while (data->parent_data)
- data = data->parent_data;
-
- phys_irq = data->hwirq;
-
- /*
- * Tell the VGIC that the virtual interrupt is tied to a
- * physical interrupt. We do that once per VCPU.
- */
- ret = kvm_vgic_map_phys_irq(vcpu, vtimer->irq.irq, phys_irq);
+ ret = kvm_vgic_map_phys_irq(vcpu, host_vtimer_irq, vtimer->irq.irq);
if (ret)
return ret;

diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 83b24d2..075f073 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -17,6 +17,8 @@
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/list_sort.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>

#include "vgic.h"

@@ -392,38 +394,66 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
return 0;
}

-int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, u32 virt_irq, u32 phys_irq)
+/* @irq->irq_lock must be held */
+static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
+ unsigned int host_irq)
{
- struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, virt_irq);
+ struct irq_desc *desc;
+ struct irq_data *data;

- BUG_ON(!irq);
-
- spin_lock(&irq->irq_lock);
+ /*
+ * Find the physical IRQ number corresponding to @host_irq
+ */
+ desc = irq_to_desc(host_irq);
+ if (!desc) {
+ kvm_err("%s: no interrupt descriptor\n", __func__);
+ return -EINVAL;
+ }
+ data = irq_desc_get_irq_data(desc);
+ while (data->parent_data)
+ data = data->parent_data;

irq->hw = true;
- irq->hwintid = phys_irq;
+ irq->host_irq = host_irq;
+ irq->hwintid = data->hwirq;
+ return 0;
+}
+
+/* @irq->irq_lock must be held */
+static inline void kvm_vgic_unmap_irq(struct vgic_irq *irq)
+{
+ irq->hw = false;
+ irq->hwintid = 0;
+}
+
+int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
+ u32 vintid)
+{
+ struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
+ int ret;

+ BUG_ON(!irq);
+
+ spin_lock(&irq->irq_lock);
+ ret = kvm_vgic_map_irq(vcpu, irq, host_irq);
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);

- return 0;
+ return ret;
}

-int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq)
+int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid)
{
struct vgic_irq *irq;

if (!vgic_initialized(vcpu->kvm))
return -EAGAIN;

- irq = vgic_get_irq(vcpu->kvm, vcpu, virt_irq);
+ irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
BUG_ON(!irq);

spin_lock(&irq->irq_lock);
-
- irq->hw = false;
- irq->hwintid = 0;
-
+ kvm_vgic_unmap_irq(irq);
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);

@@ -726,9 +756,9 @@ void vgic_kick_vcpus(struct kvm *kvm)
}
}

-bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq)
+bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid)
{
- struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, virt_irq);
+ struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
bool map_is_active;

spin_lock(&irq->irq_lock);
--
2.5.5