Commit 1146a78b authored by Gleb Natapov's avatar Gleb Natapov
Browse files

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: default avatarGleb Natapov <gleb@redhat.com>
parent 991eebf9
......@@ -4383,7 +4383,7 @@ done_prefixes:
ctxt->intercept = opcode.intercept;
/* Unrecognised? */
if (ctxt->d == 0 || (ctxt->d & NotImpl) || (ctxt->d & Undefined))
if (ctxt->d == 0 || (ctxt->d & NotImpl))
return EMULATION_FAILED;
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;
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);
goto done;
}
......
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