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KVM: x86 emulator: If LOCK prefix is used dest arg should be memory.

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If LOCK prefix is used dest arg should be memory, otherwise instruction
should generate #UD.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov
2010-03-18 15:20:14 +02:00
committed by Avi Kivity
parent fd5253658b
commit a41ffb7540
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/emulate.c
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@@ -1842,7 +1842,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
} }
/* LOCK prefix is allowed only with some instructions */ /* LOCK prefix is allowed only with some instructions */
if (c->lock_prefix && !(c->d & Lock)) { if (c->lock_prefix && (!(c->d & Lock) || c->dst.type != OP_MEM)) {
kvm_queue_exception(ctxt->vcpu, UD_VECTOR); kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
goto done; goto done;
} }