KVM: arm/arm64: vgic-new: Implement kvm_vgic_vcpu_pending_irq

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>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 0bf0d2060053..7e010087224c 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -520,3 +520,28 @@ 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;
+}