From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: Ping: [PATCH v3 2/4] x86: suppress SMEP and SMAP
 while running 32-bit PV guest code
Date: Wed, 04 May 2016 07:35:58 -0600
Message-ID: <572A16DE02000078000E892C@prv-mh.provo.novell.com>
References: <56D97AC102000078000D9537@prv-mh.provo.novell.com>
 <56E14FF502000078000DB232@prv-mh.provo.novell.com>
 <56E9A0DB02000078000DD54C@prv-mh.provo.novell.com>
 <56EA6FDF02000078000DD8FB@prv-mh.provo.novell.com>
 <56EA6FDF02000078000DD8FB@prv-mh.provo.novell.com>
 <5728CAC202000078000E80D8@prv-mh.provo.novell.com>
 <5728B14C.6010801@citrix.com>
 <5728D0E502000078000E813C@prv-mh.provo.novell.com>
 <5729C90B.4050809@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta5.messagelabs.com ([195.245.231.135])
 by lists.xenproject.org with esmtp (Exim 4.84_2)
 (envelope-from <JBeulich@suse.com>) id 1axwyC-0004i7-Pu
 for xen-devel@lists.xenproject.org; Wed, 04 May 2016 13:36:04 +0000
In-Reply-To: <5729C90B.4050809@citrix.com>
Content-Disposition: inline
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>
Errors-To: xen-devel-bounces@lists.xen.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xen.org>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wei.liu2@citrix.com>, George Dunlap <George.Dunlap@eu.citrix.com>, Tim Deegan <tim@xen.org>, IanJackson <Ian.Jackson@eu.citrix.com>, xen-devel <xen-devel@lists.xenproject.org>, FengWu <feng.wu@intel.com>
List-Id: xen-devel@lists.xenproject.org
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