From: Eric Auger <eric.auger@xxxxxxxxxx>
Tell KVM whether a particular VCPU has an IRQ that needs handling
in the guest. This is used to decide whether a VCPU is runnable.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
Changelog RFC..v1:
- return false if distributor is disabled
- add vgic_kick_vcpus() implementations
include/kvm/vgic/vgic.h | 2 ++
virt/kvm/arm/vgic/vgic.c | 40 ++++++++++++++++++++++++++++++++++++++++
virt/kvm/arm/vgic/vgic.h | 1 +
3 files changed, 43 insertions(+)
diff --git a/include/kvm/vgic/vgic.h b/include/kvm/vgic/vgic.h
index 5fae4a9..2615205 100644
--- a/include/kvm/vgic/vgic.h
+++ b/include/kvm/vgic/vgic.h
@@ -184,6 +184,8 @@ struct vgic_cpu {
int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
bool level);
+int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
+
#define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel))
#define vgic_initialized(k) (false)
#define vgic_ready(k) ((k)->arch.vgic.ready)
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index ae52928..eeb766e 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -519,3 +519,43 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
vgic_flush_lr_state(vcpu);
spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
}
+
+int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
+{
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ struct vgic_irq *irq;
+ bool pending = false;
+
+ if (!vcpu->kvm->arch.vgic.enabled)
+ return false;
+
+ spin_lock(&vgic_cpu->ap_list_lock);
+
+ list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
+ spin_lock(&irq->irq_lock);
+ pending = irq->pending && irq->enabled;
+ spin_unlock(&irq->irq_lock);
+
+ if (pending)
+ break;
+ }
+
+ spin_unlock(&vgic_cpu->ap_list_lock);
+
+ return pending;
+}
+
+void vgic_kick_vcpus(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ int c;
+
+ /*
+ * We've injected an interrupt, time to find out who deserves
+ * a good kick...
+ */
+ kvm_for_each_vcpu(c, vcpu, kvm) {
+ if (kvm_vgic_vcpu_pending_irq(vcpu))
+ kvm_vcpu_kick(vcpu);
+ }
+}
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 81b1a20..0c92cda 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -21,6 +21,7 @@
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
u32 intid);
bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq);
+void vgic_kick_vcpus(struct kvm *kvm);
void vgic_v2_process_maintenance(struct kvm_vcpu *vcpu);
void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu);
--
2.7.3
--
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