[PATCH 13/24] KVM: x86 emulator: If LOCK prefix is used dest arg should be memory.

[Gleb Natapov]

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

Signed-off-by: Gleb Natapov <g...@redhat.com>
---
 arch/x86/kvm/emulate.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 45ded7f..018abb3 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1838,7 +1838,7 @@ 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;
        }
-- 
1.6.5

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