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KVM: i8259: initialize isr_ack

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isr_ack is never initialized.  So, until the first PIC reset, interrupts
may fail to be injected.  This can cause Windows XP to fail to boot, as
reported in the fallout from the fix to
https://bugzilla.kernel.org/show_bug.cgi?id=21962.

Reported-and-tested-by: Nicolas Prochazka <prochazka.nicolas@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-12-31 10:52:15 +02:00
parent 649497d1a3
commit d0dfc6b74a
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/i8259.c
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@ -575,6 +575,8 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm)
s->pics[1].elcr_mask = 0xde;
s->pics[0].pics_state = s;
s->pics[1].pics_state = s;
s->pics[0].isr_ack = 0xff;
s->pics[1].isr_ack = 0xff;
/*
* Initialize PIO device