leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

KVM: x86 emulator: add NoAccess flag for memory instructions that skip access

Browse Source 
Use for INVLPG, which accesses the tlb, not memory.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-01 15:10:29 +03:00
parent b27f38563d
commit 5a506b125f
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/kvm/emulate.c
View File

@ -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 Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
#define Undefined (1<<25) /* No Such Instruction */
#define Lock (1<<26) /* lock prefix is allowed for the instruction */
@ -2067,7 +2068,8 @@ 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,
@ -2456,7 +2458,7 @@ 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:
/*