KVM: x86 emulator: fix LIDT/LGDT in long mode

The operand size for these instructions is 8 bytes in long mode, even without
a REX prefix.  Set it explicitly.

Triggered while booting Linux with emulate_invalid_guest_state=1.

Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index fe4340f..24c8425 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2997,6 +2997,8 @@
 	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 @@
 	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);