From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yu Zhang <yu.c.zhang@linux.intel.com>
Subject: Re: [PATCH v9 5/5] x86/ioreq server: Synchronously
 reset outstanding p2m_ioreq_server entries when an ioreq server unmaps.
Date: Tue, 21 Mar 2017 19:15:46 +0800
Message-ID: <58D10B62.3080906@linux.intel.com>
References: <1490064773-26751-1-git-send-email-yu.c.zhang@linux.intel.com>
 <1490064773-26751-6-git-send-email-yu.c.zhang@linux.intel.com>
 <5d845ae8dbee4b2f898e42d23ec84f93@AMSPEX02CL03.citrite.net>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <5d845ae8dbee4b2f898e42d23ec84f93@AMSPEX02CL03.citrite.net>
List-Unsubscribe: <https://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: <https://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: Paul Durrant <Paul.Durrant@citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Cc: Andrew Cooper <Andrew.Cooper3@citrix.com>, "zhiyuan.lv@intel.com" <zhiyuan.lv@intel.com>, Jan Beulich <jbeulich@suse.com>, George Dunlap <George.Dunlap@citrix.com>
List-Id: xen-devel@lists.xenproject.org
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