Use for INVLPG, which accesses the tlb, not memory.
Signed-off-by: Avi Kivity <[email protected]>
---
arch/x86/kvm/emulate.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 5bc62f2..29312a0 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -83,6 +83,7 @@
#define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */
#define GroupDual (1<<15) /* Alternate decoding of mod == 3 */
/* Misc flags */
+#define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */
#define Force64 (1<<24) /* Force operand size to 64 bits in 64-bit mode */
#define Undefined (1<<25) /* No Such Instruction */
#define Lock (1<<26) /* lock prefix is allowed for the instruction */
@@ -2062,7 +2063,8 @@ static struct opcode group5[] = {
static struct group_dual group7 = { {
N, N, D(ModRM | SrcMem | Priv), D(ModRM | SrcMem | Priv),
D(SrcNone | ModRM | DstMem | Mov), N,
- D(SrcMem16 | ModRM | Mov | Priv), D(SrcMem | ModRM | ByteOp | Priv),
+ D(SrcMem16 | ModRM | Mov | Priv),
+ D(SrcMem | ModRM | ByteOp | Priv | NoAccess),
}, {
D(SrcNone | ModRM | Priv), N, N, D(SrcNone | ModRM | Priv),
D(SrcNone | ModRM | DstMem | Mov), N,
@@ -2444,7 +2446,7 @@ done_prefixes:
c->src.bytes = (c->d & ByteOp) ? 1 :
c->op_bytes;
/* Don't fetch the address for invlpg: it could be unmapped. */
- if (c->twobyte && c->b == 0x01 && c->modrm_reg == 7)
+ if (c->d & NoAccess)
break;
srcmem_common:
/*
--
1.7.1
--
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