From: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
This is needed in order to be able to support guest code that uses movq to
write into pages that are marked for write tracking.
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 24 +++++++++++++++---------
1 file changed, 15 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index b8a412b8b087..2297955d0934 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1180,23 +1180,24 @@ static int em_fnstsw(struct x86_emulate_ctxt *ctxt)
static u8 simd_prefix_to_bytes(const struct x86_emulate_ctxt *ctxt,
int simd_prefix)
{
- u8 bytes;
+ u8 bytes = 16;
switch (ctxt->b) {
case 0x11:
/* movss xmm, m32 */
/* movsd xmm, m64 */
/* movups xmm, m128 */
- if (simd_prefix == 0xf3) {
+ if (simd_prefix == 0xf3)
bytes = 4;
- break;
- } else if (simd_prefix == 0xf2) {
+ else if (simd_prefix == 0xf2)
bytes = 8;
- break;
- }
- /* fallthrough */
+ break;
+ case 0xd6:
+ /* movq xmm, m64 */
+ if (simd_prefix == 0x66)
+ bytes = 8;
+ break;
default:
- bytes = 16;
break;
}
return bytes;
@@ -4549,6 +4550,10 @@ static const struct instr_dual instr_dual_0f_2b = {
I(0, em_mov), N
};
+static const struct gprefix pfx_0f_d6 = {
+ N, I(0, em_mov), N, N,
+};
+
static const struct gprefix pfx_0f_2b = {
ID(0, &instr_dual_0f_2b), ID(0, &instr_dual_0f_2b), N, N,
};
@@ -4846,7 +4851,8 @@ static const struct opcode twobyte_table[256] = {
/* 0xC8 - 0xCF */
X8(I(DstReg, em_bswap)),
/* 0xD0 - 0xDF */
- N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
+ N, N, N, N, N, N, GP(ModRM | SrcReg | DstMem | Mov | Sse, &pfx_0f_d6),
+ N, N, N, N, N, N, N, N, N,
/* 0xE0 - 0xEF */
N, N, N, N, N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_e7),
N, N, N, N, N, N, N, N,
