From: Avi Kivity <avi@redhat.com>
Date: Mon, 30 Aug 2010 09:18:24 +0000 (+0300)
Subject: KVM: i8259: Make ICW1 conform to spec
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9ed049c3b6230b68985da31f8243d4bec95e0b3a;p=linux-beck.git

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 <avi@redhat.com>
---

diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index 4b7b73ce2098..6e77471951e8 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)