From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: [PATCH 5/6] x86: avoid explicit TLB flush when
 saving exec state
Date: Mon, 22 Jan 2018 02:56:02 -0700
Message-ID: <5A65C34202000078001A0F45@prv-mh.provo.novell.com>
References: <5A62238B02000078001A0768@prv-mh.provo.novell.com>
 <5A6225A202000078001A07D5@prv-mh.provo.novell.com>
 <CAFLBxZbrFz7cYWn51b+cebzPepVL32ahs8oZEnS_M1gJ9MXr6g@mail.gmail.com>
 <CAFLBxZb369H33HigM4Y-Oq8wOK+bZuxorhobyzwXfntzeswhnQ@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xenproject.org>
Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6])
 by lists.xenproject.org with esmtp (Exim 4.84_2)
 (envelope-from <srs0=cwx6=er=suse.com=jbeulich@srs-us1.protection.inumbo.net>)
 id 1edYpk-0004fc-Qv
 for xen-devel@lists.xenproject.org; Mon, 22 Jan 2018 09:56:08 +0000
In-Reply-To: <CAFLBxZb369H33HigM4Y-Oq8wOK+bZuxorhobyzwXfntzeswhnQ@mail.gmail.com>
Content-Disposition: inline
List-Unsubscribe: <https://lists.xenproject.org/mailman/options/xen-devel>,
 <mailto:xen-devel-request@lists.xenproject.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xenproject.org>
List-Help: <mailto:xen-devel-request@lists.xenproject.org?subject=help>
List-Subscribe: <https://lists.xenproject.org/mailman/listinfo/xen-devel>,
 <mailto:xen-devel-request@lists.xenproject.org?subject=subscribe>
Errors-To: xen-devel-bounces@lists.xenproject.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xenproject.org>
To: Andrew Cooper <andrew.cooper3@citrix.com>, George Dunlap <dunlapg@umich.edu>
Cc: xen-devel <xen-devel@lists.xenproject.org>
List-Id: xen-devel@lists.xenproject.org
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