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Commit a41ffb75 authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
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KVM: x86 emulator: If LOCK prefix is used dest arg should be memory.



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

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent fd525365
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+1 −1
Original line number Diff line number Diff line
@@ -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 */
	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);
		goto done;
	}