[RFC PATCH 11/45] KVM: arm/arm64: vgic-new: Implement kvm_vgic_vcpu_pending_irq

Andre Przywara
2016-03-25T02:04:34Z

From: Eric Auger <eric.auger@linaro.org>

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@linaro.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
include/kvm/vgic/vgic.h | 2 ++
virt/kvm/arm/vgic/vgic.c | 22 ++++++++++++++++++++++
2 files changed, 24 insertions(+)

diff --git a/include/kvm/vgic/vgic.h b/include/kvm/vgic/vgic.h
index 986f23f..2ce9b4a 100644
--- a/include/kvm/vgic/vgic.h
+++ b/include/kvm/vgic/vgic.h
@@ -181,6 +181,8 @@ 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 9eb031e8..d6c8c92 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -477,3 +477,25 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
vgic_populate_lrs(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;
+
+ 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;
+}
--
2.7.3