Commit d37c8557 authored Jul 25, 2007 by Aurelien Jarno Committed by Avi Kivity Jul 25, 2007

KVM: disable writeback for 0x0f 0x01 instructions.



0x0f 0x01 instructions (ie lgdt, lidt, smsw, lmsw and invlpg) does
not use writeback. This patch set no_wb=1 when emulating those
instructions.

This fixes a regression booting the FreeBSD kernel on AMD.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>

parent 4c981b43

drivers/kvm/x86_emulate.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1178,6 +1178,8 @@ x86_emulate_memop(struct x86_emulate_ctxt ctxt, struct x86_emulate_ops ops)
		twobyte_insn:
		switch (b) {
		case 0x01: /* lgdt, lidt, lmsw */
		/* Disable writeback. */
		no_wb = 1;
		switch (modrm_reg) {
		u16 size;
		unsigned long address;