From mboxrd@z Thu Jan  1 00:00:00 1970
From: John Byrne <john.l.byrne@hp.com>
Subject: Re: Live migration leaves page tables read-only?
Date: Fri, 08 Dec 2006 21:44:31 -0800
Message-ID: <457A4D3F.5070206@hp.com>
References: <456CD0A5.1060701@hp.com> <456CD2DC.2020201@hp.com>
	<8A87A9A84C201449A0C56B728ACF491E01FA12@liverpoolst.ad.cl.cam.ac.uk>
	<456CF5F9.7070009@hp.com> <456F6AF5.2090005@hp.com>
	<8A87A9A84C201449A0C56B728ACF491E01FA69@liverpoolst.ad.cl.cam.ac.uk>
	<457A4C68.6050800@hp.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <457A4C68.6050800@hp.com>
List-Unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
Cc: xen-devel <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

John Byrne wrote:
> ...snipped..
> I finally ran down the problem. SAP is protecting the pages PROT_NONE, 
> so the page-present bit in the pte is not set and 
> canonicalize/uncanonicalize code in save/restore ignore the pte. I've 
> attached a patch. It is possible that this change should be made to the 
> l1e tests in xc_ptrace.c; I'm not sure.
> 
> John Byrne
> 

The patch is against xen-unstable changeset 12815:1ad7dff99968.

John Byrne