From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [for-xen-4.5 PATCH] Ignore non-zero data in unused
 xsave area.
Date: Tue, 18 Nov 2014 16:36:31 +0000
Message-ID: <546B758F.9020207@citrix.com>
References: <1416324391-21118-1-git-send-email-dkoch@verizon.com>
	<20141118163247.GF17095@laptop.dumpdata.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <20141118163247.GF17095@laptop.dumpdata.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Don Koch <dkoch@verizon.com>
Cc: Keir Fraser <keir@xen.org>, Jan Beulich <JBeulich@suse.com>, xen-devel@lists.xen.org
List-Id: xen-devel@lists.xenproject.org

On 18/11/14 16:32, Konrad Rzeszutek Wilk wrote:
> On Tue, Nov 18, 2014 at 10:26:31AM -0500, Don Koch wrote:
>> If we restore an xsave area from an older xen that has a larger
>> size than the xcr0 bit call for, it is possible to have non-zero
>> data in the unused area if an xsave has ever been done that used

Do you mean "has never been done".

i.e. the non-zero data is actually Xen heap junk?

~Andrew