KVM: PPC: Allow userspace to unset the IRQ line
Userspace can tell us that it wants to trigger an interrupt. But
so far it can't tell us that it wants to stop triggering one.
So let's interpret the parameter to the ioctl that we have anyways
to tell us if we want to raise or lower the interrupt line.
Signed-off-by: Alexander Graf <agraf@suse.de>
v2 -> v3:
- Add CAP for unset irq
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 3f8677e..0bb6a7e 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -149,6 +149,7 @@
switch (ext) {
case KVM_CAP_PPC_SEGSTATE:
case KVM_CAP_PPC_PAIRED_SINGLES:
+ case KVM_CAP_PPC_UNSET_IRQ:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
@@ -451,7 +452,10 @@
int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
{
- kvmppc_core_queue_external(vcpu, irq);
+ if (irq->irq == KVM_INTERRUPT_UNSET)
+ kvmppc_core_dequeue_external(vcpu, irq);
+ else
+ kvmppc_core_queue_external(vcpu, irq);
if (waitqueue_active(&vcpu->wq)) {
wake_up_interruptible(&vcpu->wq);