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@xxxxxxxxxx>
---
arch/x86/kvm/i8259.c | 16 ++++++++++------
1 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index 8d10c06..a82876f 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -305,13 +305,17 @@ 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)
--
1.7.1
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