Commit 3b32004a66e9 ("KVM: x86: movnti minimum op size of 32-bit is not kept")
did not fully fix the minimum operand size of MONTI emulation. Still, MOVNTI
may be mistakenly performed using 16-bit opsize.
This patch add No16 flag to mark an instruction does not support 16-bits
operand size.
Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 24b0df7..84a83dc 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -167,6 +167,7 @@
#define NoBigReal ((u64)1 << 50) /* No big real mode */
#define PrivUD ((u64)1 << 51) /* #UD instead of #GP on CPL > 0 */
#define NearBranch ((u64)1 << 52) /* Near branches */
+#define No16 ((u64)1 << 53) /* No 16 bit operand */
#define DstXacc (DstAccLo | SrcAccHi | SrcWrite)
@@ -4116,7 +4117,7 @@ static const struct opcode twobyte_table[256] = {
D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
/* 0xC0 - 0xC7 */
F2bv(DstMem | SrcReg | ModRM | SrcWrite | Lock, em_xadd),
- N, D(DstMem | SrcReg | ModRM | Mov),
+ N, I(DstMem | SrcReg | ModRM | No16 | Mov, em_mov),
N, N, N, GD(0, &group9),
/* 0xC8 - 0xCF */
X8(I(DstReg, em_bswap)),
@@ -4561,7 +4562,8 @@ done_prefixes:
return EMULATION_FAILED;
if (unlikely(ctxt->d &
- (NotImpl|Stack|Op3264|Sse|Mmx|Intercept|CheckPerm|NearBranch))) {
+ (NotImpl|Stack|Op3264|Sse|Mmx|Intercept|CheckPerm|NearBranch|
+ No16))) {
/*
* These are copied unconditionally here, and checked unconditionally
* in x86_emulate_insn.
@@ -4586,6 +4588,9 @@ done_prefixes:
ctxt->op_bytes = 4;
}
+ if ((ctxt->d & No16) && ctxt->op_bytes == 2)
+ ctxt->op_bytes = 4;
+
if (ctxt->d & Sse)
ctxt->op_bytes = 16;
else if (ctxt->d & Mmx)
@@ -5051,11 +5056,6 @@ twobyte_insn:
ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val :
(s16) ctxt->src.val;
break;
- case 0xc3: /* movnti */
- ctxt->dst.bytes = ctxt->op_bytes;
- ctxt->dst.val = (ctxt->op_bytes == 8) ? (u64) ctxt->src.val :
- (u32) ctxt->src.val;
- break;
default:
goto cannot_emulate;
}
--
1.9.1
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