From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: questions of vm save/restore on arm64
Date: Mon, 6 Jun 2016 12:58:14 +0100 (BST)
Message-ID: <alpine.DEB.2.10.1606061249380.6721@sstabellini-ThinkPad-X260>
References: <CA+e=sbJK7DoQgB_cfT8hhLcxk3bqVjgWBewDROHBZr2MMrv8Mw@mail.gmail.com>
 <alpine.DEB.2.10.1605301233160.3896@sstabellini-ThinkPad-X260>
 <5f28430f-50ee-7d5a-2308-0d16f116ab0e@gmail.com> <5750269F.90305@arm.com>
 <085e1ec7-cfe7-00b6-d8da-a3f66eddf9ff@gmail.com>
 <575158F6.5010208@arm.com> <65ae2d4c-783c-e012-076a-907ac02ebb16@gmail.com>
 <575163C3.4050506@arm.com> <dcc22df5-81da-47ea-8e89-01b6f764f9ba@gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <dcc22df5-81da-47ea-8e89-01b6f764f9ba@gmail.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>
Errors-To: xen-devel-bounces@lists.xen.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xen.org>
To: Chenxiao Zhao <chenxiao.zhao@gmail.com>
Cc: Julien Grall <julien.grall@arm.com>, Stefano Stabellini <sstabellini@kernel.org>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org
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