From 89dbfe4ad149c309590fec6c8d29d8be0e282801 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Fri, 31 Dec 2010 10:52:15 +0200 Subject: [PATCH] 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 file changed, 2 insertions(+) diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index f628234fbeca0..3cece05e4ac46 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 -- 2.39.5