From 1e144569ab9d311fa5e08efc9a7fb35853d697d9 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Fri, 31 Dec 2010 10:52:15 +0200 Subject: [PATCH 44/65] KVM: i8259: initialize isr_ack 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 Signed-off-by: Avi Kivity --- arch/x86/kvm/i8259.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index f628234..3cece05 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -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 -- 1.6.6.1