KVM: emulator: Do not fail on emulation of undefined opcode
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>
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1 changed files with 3 additions and 2 deletions
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@ -4383,7 +4383,7 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
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ctxt->intercept = opcode.intercept;
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/* Unrecognised? */
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if (ctxt->d == 0 || (ctxt->d & NotImpl) || (ctxt->d & Undefined))
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if (ctxt->d == 0 || (ctxt->d & NotImpl))
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return EMULATION_FAILED;
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if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn)
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@ -4521,7 +4521,8 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
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ctxt->mem_read.pos = 0;
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if (ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) {
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if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
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(ctxt->d & Undefined)) {
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rc = emulate_ud(ctxt);
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goto done;
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}
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