From: Mihai Donțu <mdo...@bitdefender.com>
This is needed in order to be able to support guest code that uses movsd to
write into pages that are marked for write tracking.
Signed-off-by: Mihai Donțu <mdo...@bitdefender.com>
Signed-off-by: Adalbert Lazăr <ala...@bitdefender.com>
---
arch/x86/kvm/emulate.c | 32 +++++++++++++++++++++++++++-----
1 file changed, 27 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 34431cf31f74..9d38f892beea 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1177,6 +1177,27 @@ static int em_fnstsw(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
+static u8 simd_prefix_to_bytes(const struct x86_emulate_ctxt *ctxt,
+ int simd_prefix)
+{
+ u8 bytes;
+
+ switch (ctxt->b) {
+ case 0x11:
+ /* movsd xmm, m64 */
+ /* movups xmm, m128 */
+ if (simd_prefix == 0xf2) {
+ bytes = 8;
+ break;
+ }
+ /* fallthrough */
+ default:
+ bytes = 16;
+ break;
+ }
+ return bytes;
+}
+
static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
struct operand *op)
{
@@ -1187,7 +1208,7 @@ static void decode_register_operand(struct
x86_emulate_ctxt *ctxt,
if (ctxt->d & Sse) {
op->type = OP_XMM;
- op->bytes = 16;
+ op->bytes = ctxt->op_bytes;
op->addr.xmm = reg;
read_sse_reg(ctxt, &op->vec_val, reg);
return;
@@ -1238,7 +1259,7 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
ctxt->d & ByteOp);
if (ctxt->d & Sse) {
op->type = OP_XMM;
- op->bytes = 16;
+ op->bytes = ctxt->op_bytes;
op->addr.xmm = ctxt->modrm_rm;
read_sse_reg(ctxt, &op->vec_val, ctxt->modrm_rm);
return rc;
@@ -4529,7 +4550,7 @@ static const struct gprefix pfx_0f_2b = {
};
static const struct gprefix pfx_0f_10_0f_11 = {
- I(Unaligned, em_mov), I(Unaligned, em_mov), N, N,
+ I(Unaligned, em_mov), I(Unaligned, em_mov), I(Unaligned, em_mov), N,
};
static const struct gprefix pfx_0f_28_0f_29 = {
@@ -5097,7 +5118,7 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void
*insn, int insn_len)
{
int rc = X86EMUL_CONTINUE;
int mode = ctxt->mode;
- int def_op_bytes, def_ad_bytes, goffset, simd_prefix;
+ int def_op_bytes, def_ad_bytes, goffset, simd_prefix = 0;
bool op_prefix = false;
bool has_seg_override = false;
struct opcode opcode;
@@ -5320,7 +5341,8 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void
*insn, int insn_len)
ctxt->op_bytes = 4;
if (ctxt->d & Sse)
- ctxt->op_bytes = 16;
+ ctxt->op_bytes = simd_prefix_to_bytes(ctxt,
+ simd_prefix);
else if (ctxt->d & Mmx)
ctxt->op_bytes = 8;
}
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