From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kyle Huey <me@kylehuey.com>
Subject: Re: VPMU interrupt unreliability
Date: Mon, 24 Jul 2017 07:32:47 -0700
Message-ID: <CAP045ArrN6srDVBr604G3VwKbJGXvFSvsUvuVfSBO2zD7v6opg@mail.gmail.com>
References: <CAP045Arh6NMGkv=Khguyc+40gaN1fCO3T1MPvNOnThMT9uPSbQ@mail.gmail.com>
 <9b74cd6e-d22a-0b8c-3219-7cb9410ea3a8@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>
In-Reply-To: <9b74cd6e-d22a-0b8c-3219-7cb9410ea3a8@citrix.com>
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: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Kevin Tian <kevin.tian@intel.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Jan Beulich <JBeulich@suse.com>, Dietmar Hahn <dietmar.hahn@ts.fujitsu.com>, xen-devel@lists.xen.org
List-Id: xen-devel@lists.xenproject.org
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