diff --git a/[refs] b/[refs]
index a5785e0d6b4a..b2d298c55999 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 79d5b4c3cd809c770d4bf9812635647016c56011
+refs/heads/master: 510425ff3344df03a1f94bce49e659ae302e0d34
diff --git a/trunk/arch/x86/kvm/emulate.c b/trunk/arch/x86/kvm/emulate.c
index fe4340f62137..24c84251648b 100644
--- a/trunk/arch/x86/kvm/emulate.c
+++ b/trunk/arch/x86/kvm/emulate.c
@@ -2997,6 +2997,8 @@ static int em_lgdt(struct x86_emulate_ctxt *ctxt)
 	struct desc_ptr desc_ptr;
 	int rc;
 
+	if (ctxt->mode == X86EMUL_MODE_PROT64)
+		ctxt->op_bytes = 8;
 	rc = read_descriptor(ctxt, ctxt->src.addr.mem,
 			     &desc_ptr.size, &desc_ptr.address,
 			     ctxt->op_bytes);
@@ -3024,6 +3026,8 @@ static int em_lidt(struct x86_emulate_ctxt *ctxt)
 	struct desc_ptr desc_ptr;
 	int rc;
 
+	if (ctxt->mode == X86EMUL_MODE_PROT64)
+		ctxt->op_bytes = 8;
 	rc = read_descriptor(ctxt, ctxt->src.addr.mem,
 			     &desc_ptr.size, &desc_ptr.address,
 			     ctxt->op_bytes);