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KVM: ioapic: clear IRR for edge-triggered interrupts at delivery

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This ensures that IRR bits are set in the KVM_GET_IRQCHIP result only if
the interrupt is still sitting in the IOAPIC.  After the next patches, it
avoids spurious reinjection of the interrupt when KVM_SET_IRQCHIP is
called.

Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-03-18 10:47:17 +01:00
parent 0b10a1c87a
commit 0bc830b05c
1 changed files with 3 additions and 0 deletions
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3
virt/kvm/ioapic.c
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@ -288,6 +288,9 @@ static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
irqe.level = 1;
irqe.shorthand = 0;
if (irqe.trig_mode == IOAPIC_EDGE_TRIG)
ioapic->irr &= ~(1 << irq);
if (irq == RTC_GSI && line_status) {
BUG_ON(ioapic->rtc_status.pending_eoi != 0);
ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,