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KVM: i8259: Make ICW1 conform to spec

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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 <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-30 12:18:24 +03:00
parent 7d9ddaedd8
commit 9ed049c3b6
1 changed files with 10 additions and 6 deletions
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16
arch/x86/kvm/i8259.c
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@ -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)