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Commit 9ed049c3 authored by Avi Kivity's avatar Avi Kivity
Browse files

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: default avatarAvi Kivity <avi@redhat.com>
parent 7d9ddaed

arch/x86/kvm/i8259.c

+10 −6
Original line number Diff line number Diff line
@@ -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)