KVM: ioapic: clear IRR for edge-triggered interrupts at delivery
authorPaolo Bonzini <pbonzini@redhat.com>
Tue, 18 Mar 2014 09:47:17 +0000 (10:47 +0100)
committerPaolo Bonzini <pbonzini@redhat.com>
Fri, 21 Mar 2014 09:20:10 +0000 (10:20 +0100)
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>
virt/kvm/ioapic.c

index 0b4914147b9d59257b1dd1c3ec5c2f8e59ccd17d..25e16a6898ed4a2f232235b5b0b588d1e8996661 100644 (file)
@@ -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,