From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: Should PV frontend drivers trust the backends?
Date: Wed, 25 Apr 2018 14:36:11 +0100
Message-ID: <4c1d0926-e76d-15a7-4f11-044826c08fb7@citrix.com>
References: <9ab3e669-787b-ef4d-b672-9bbf5dcb5f14@suse.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 all-amaz-eas1.inumbo.com ([34.197.232.57])
 by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from
 <srs0=yxgq=ho=citrix.com=prvs=64648bdfb=andrew.cooper3@srs-us1.protection.inumbo.net>)
 id 1fBKal-0007df-2g
 for xen-devel@lists.xenproject.org; Wed, 25 Apr 2018 13:36:15 +0000
In-Reply-To: <9ab3e669-787b-ef4d-b672-9bbf5dcb5f14@suse.com>
Content-Language: en-GB
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: Juergen Gross <jgross@suse.com>, xen-devel <xen-devel@lists.xenproject.org>
List-Id: xen-devel@lists.xenproject.org
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