KVM: Report IRQ injection status to userspace.
IRQ injection status is either -1 (if there was no CPU found
that should except the interrupt because IRQ was masked or
ioapic was misconfigured or ...) or >= 0 in that case the
number indicates to how many CPUs interrupt was injected.
If the value is 0 it means that the interrupt was coalesced
and probably should be reinjected.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 05d7be8..e4db5be 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1019,6 +1019,7 @@
case KVM_CAP_MP_STATE:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_REINJECT_CONTROL:
+ case KVM_CAP_IRQ_INJECT_STATUS:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
@@ -1877,6 +1878,7 @@
create_pit_unlock:
mutex_unlock(&kvm->lock);
break;
+ case KVM_IRQ_LINE_STATUS:
case KVM_IRQ_LINE: {
struct kvm_irq_level irq_event;
@@ -1884,10 +1886,17 @@
if (copy_from_user(&irq_event, argp, sizeof irq_event))
goto out;
if (irqchip_in_kernel(kvm)) {
+ __s32 status;
mutex_lock(&kvm->lock);
- kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
- irq_event.irq, irq_event.level);
+ status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
+ irq_event.irq, irq_event.level);
mutex_unlock(&kvm->lock);
+ if (ioctl == KVM_IRQ_LINE_STATUS) {
+ irq_event.status = status;
+ if (copy_to_user(argp, &irq_event,
+ sizeof irq_event))
+ goto out;
+ }
r = 0;
}
break;
