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KVM: emulator: Do not fail on emulation of undefined opcode

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Emulation of undefined opcode should inject #UD instead of causing
emulation failure. Do that by moving Undefined flag check to emulation
stage and injection #UD there.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Gleb Natapov 2013-04-11 12:30:01 +03:00
parent 991eebf9f8
commit 1146a78b8d
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/emulate.c
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@ -4383,7 +4383,7 @@ done_prefixes:
ctxt->intercept = opcode.intercept; ctxt->intercept = opcode.intercept;
/* Unrecognised? */ /* Unrecognised? */
if (ctxt->d == 0 || (ctxt->d & NotImpl) || (ctxt->d & Undefined)) if (ctxt->d == 0 || (ctxt->d & NotImpl))
return EMULATION_FAILED; return EMULATION_FAILED;
if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn) if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn)
@ -4521,7 +4521,8 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
ctxt->mem_read.pos = 0; ctxt->mem_read.pos = 0;
if (ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) { if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
(ctxt->d & Undefined)) {
rc = emulate_ud(ctxt); rc = emulate_ud(ctxt);
goto done; goto done;
} }