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KVM: x86: reset edge sense circuit of i8259 on init

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The spec says that during initialization "The edge sense circuit is
reset which means that following initialization an interrupt request
(IR) input must make a low-to-high transition to generate an interrupt",
but currently if edge triggered interrupt is in IRR it is delivered
after i8259 initialization.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2012-01-24 15:06:05 +02:00 committed by Avi Kivity
parent d2a1b483a4
commit 242ec97c35
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/i8259.c
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@ -307,6 +307,7 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val)
if (val & 0x10) { if (val & 0x10) {
s->init4 = val & 1; s->init4 = val & 1;
s->last_irr = 0; s->last_irr = 0;
s->irr &= s->elcr;
s->imr = 0; s->imr = 0;
s->priority_add = 0; s->priority_add = 0;
s->special_mask = 0; s->special_mask = 0;