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authorAurelien Jarno <aurelien@aurel32.net>2007-07-25 10:19:54 +0200
committerAvi Kivity <avi@qumranet.com>2007-07-25 14:31:27 +0300
commitd37c85571904a622cbabc7a2e04b8c919de75ac0 (patch)
tree460694be89be0bfa0049a23c842e0cb3edcf6eca
parent4c981b43d7ec18818754bf85b829865abd0ce340 (diff)
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>
-rw-r--r--drivers/kvm/x86_emulate.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 1b800fc0034..1f979cb0df3 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -1178,6 +1178,8 @@ pop_instruction:
twobyte_insn:
switch (b) {
case 0x01: /* lgdt, lidt, lmsw */
+ /* Disable writeback. */
+ no_wb = 1;
switch (modrm_reg) {
u16 size;
unsigned long address;