From 9ed049c3b6230b68985da31f8243d4bec95e0b3a Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Mon, 30 Aug 2010 12:18:24 +0300 Subject: [PATCH] KVM: i8259: Make ICW1 conform to spec ICW is not a full reset, instead it resets a limited number of registers in the PIC. Change ICW1 emulation to only reset those registers. Signed-off-by: Avi Kivity --- arch/x86/kvm/i8259.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index 4b7b73c..6e77471 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -308,13 +308,17 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val) addr &= 1; if (addr == 0) { if (val & 0x10) { - kvm_pic_reset(s); /* init */ - /* - * deassert a pending interrupt - */ - pic_irq_request(s->pics_state->kvm, 0); - s->init_state = 1; s->init4 = val & 1; + s->last_irr = 0; + s->imr = 0; + s->priority_add = 0; + s->special_mask = 0; + s->read_reg_select = 0; + if (!s->init4) { + s->special_fully_nested_mode = 0; + s->auto_eoi = 0; + } + s->init_state = 1; if (val & 0x02) printk(KERN_ERR "single mode not supported"); if (val & 0x08) -- 2.7.4