From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bandan Das <bsd@redhat.com>
Subject: Re: Error upgrading vm from windows 8 to 8.1
Date: Fri, 27 Mar 2015 16:54:21 -0400
Message-ID: <jpgbnjenoua.fsf@redhat.com>
References: <assp.05284acecd.5515BA27.7040009@affinitygs.com>
Mime-Version: 1.0
Content-Type: text/plain
Cc: kvm@vger.kernel.org
To: coreys <coreys@affinitygs.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mx1.redhat.com ([209.132.183.28]:56691 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1752648AbbC0UyY (ORCPT <rfc822;kvm@vger.kernel.org>);
	Fri, 27 Mar 2015 16:54:24 -0400
In-Reply-To: <assp.05284acecd.5515BA27.7040009@affinitygs.com>
	(coreys@affinitygs.com's message of "Fri, 27 Mar 2015 15:14:31 -0500")
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

coreys <coreys@affinitygs.com> writes:

> When I try to upgrade my guest windows 8 vm to window 8.1. I get the
> error of processor doesn't support CompareExchange128.  Haven not been
> able to find any information about this error.

I think that's because cmpxchg16b is not emulated yet:

static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt)
{
	u64 old = ctxt->dst.orig_val64;

	if (ctxt->dst.bytes == 16)
		return X86EMUL_UNHANDLEABLE;
...