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KVM: emulator: fix unimplemented instruction detection

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Unimplemented instruction detection is broken for group instructions
since it relies on "flags" field of opcode to be zero, but all
instructions in a group inherit flags from a group encoding. Fix that by
having a separate flag for unimplemented instructions.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Gleb Natapov 2013-04-11 11:59:55 +03:00
parent f8da94e9e4
commit 0b789eee2c
1 changed files with 4 additions and 3 deletions
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7
arch/x86/kvm/emulate.c
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@ -132,8 +132,9 @@
#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
#define No64 (1<<28)
#define PageTable (1 << 29) /* instruction used to write page table */
#define NotImpl (1 << 30) /* instruction is not implemented */
/* Source 2 operand type */
#define Src2Shift (30)
#define Src2Shift (31)
#define Src2None (OpNone << Src2Shift)
#define Src2CL (OpCL << Src2Shift)
#define Src2ImmByte (OpImmByte << Src2Shift)
@ -3624,7 +3625,7 @@ static int check_perm_out(struct x86_emulate_ctxt *ctxt)
#define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i }
#define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \
.check_perm = (_p) }
#define N D(0)
#define N D(NotImpl)
#define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) }
#define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) }
#define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) }
@ -4382,7 +4383,7 @@ done_prefixes:
ctxt->intercept = opcode.intercept;
/* Unrecognised? */
if (ctxt->d == 0 || (ctxt->d & Undefined))
if (ctxt->d == 0 || (ctxt->d & NotImpl) || (ctxt->d & Undefined))
return EMULATION_FAILED;
if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn)