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KVM: disable writeback for 0x0f 0x01 instructions.

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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>
This commit is contained in:
Aurelien Jarno 2007-07-25 10:19:54 +02:00 committed by Avi Kivity
parent 4c981b43d7
commit d37c855719
1 changed files with 2 additions and 0 deletions
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2
drivers/kvm/x86_emulate.c
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@ -1178,6 +1178,8 @@ pop_instruction:
twobyte_insn: twobyte_insn:
switch (b) { switch (b) {
case 0x01: /* lgdt, lidt, lmsw */ case 0x01: /* lgdt, lidt, lmsw */
/* Disable writeback. */
no_wb = 1;
switch (modrm_reg) { switch (modrm_reg) {
u16 size; u16 size;
unsigned long address; unsigned long address;