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KVM: PIC: call ack notifiers for irqs that are dropped form irr 

After commit 242ec97c35 PIT interrupts are no longer delivered after
PIC reset. It happens because PIT injects interrupt only if previous one
was acked, but since on PIC reset it is dropped from irr it will never
be delivered and hence acknowledged. Fix that by calling ack notifier on
PIC reset.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2012-07-26 10:00:45 +03:00 committed by Avi Kivity
parent bdc0077af5
commit aea218f3cb
1 changed files with 17 additions and 0 deletions
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17
arch/x86/kvm/i8259.c
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@ -316,6 +316,11 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val)
addr &= 1;
if (addr == 0) {
if (val & 0x10) {
u8 edge_irr = s->irr & ~s->elcr;
int i;
bool found;
struct kvm_vcpu *vcpu;
s->init4 = val & 1;
s->last_irr = 0;
s->irr &= s->elcr;
@ -333,6 +338,18 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val)
if (val & 0x08)
pr_pic_unimpl(
"level sensitive irq not supported");
kvm_for_each_vcpu(i, vcpu, s->pics_state->kvm)
if (kvm_apic_accept_pic_intr(vcpu)) {
found = true;
break;
}
if (found)
for (irq = 0; irq < PIC_NUM_PINS/2; irq++)
if (edge_irr & (1 << irq))
pic_clear_isr(s, irq);
} else if (val & 0x08) {
if (val & 0x04)
s->poll = 1;