Commit a41ffb75 authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
Browse files

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

arch/x86/kvm/emulate.c

+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;

	}