From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:47556)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1UnUQl-0002Jl-LS
	for qemu-devel@nongnu.org; Fri, 14 Jun 2013 09:52:45 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1UnUQj-00027d-PR
	for qemu-devel@nongnu.org; Fri, 14 Jun 2013 09:52:43 -0400
Received: from mail-qa0-x232.google.com ([2607:f8b0:400d:c00::232]:52045)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1UnUQj-00027Y-L3
	for qemu-devel@nongnu.org; Fri, 14 Jun 2013 09:52:41 -0400
Received: by mail-qa0-f50.google.com with SMTP id l18so151054qak.9
	for <qemu-devel@nongnu.org>; Fri, 14 Jun 2013 06:52:41 -0700 (PDT)
Sender: Paolo Bonzini <paolo.bonzini@gmail.com>
Message-ID: <51BB2024.5030204@redhat.com>
Date: Fri, 14 Jun 2013 09:52:36 -0400
From: Paolo Bonzini <pbonzini@redhat.com>
MIME-Version: 1.0
References: <1371117054-5694-1-git-send-email-paul.durrant@citrix.com>
	<alpine.DEB.2.02.1306131830560.4548@kaball.uk.xensource.com>
	<9AAE0902D5BC7E449B7C8E4E778ABCD0039278@LONPEX01CL01.citrite.net>
In-Reply-To: <9AAE0902D5BC7E449B7C8E4E778ABCD0039278@LONPEX01CL01.citrite.net>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH] Remove hardcoded xen-platform device
	initialization
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Paul Durrant <Paul.Durrant@citrix.com>
Cc: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>

Il 14/06/2013 04:50, Paul Durrant ha scritto:
>> > This patch is problematic because we can't know for sure the version of
>> > upstream QEMU that is going to be used with Xen.
>> > If we apply this patch and QEMU 1.5 is going to be used with Xen 4.2,
>> > guests won't be able to use PV drivers.
>> > 
> Is there not a compatibility matrix? The hardcoded init. is just blatantly the wrong thing to be doing and it needs to go.
> 
> Could my accompanying toolstack patch not be backported to the next 4.2 release as mitigation?

I think Ian is right.  You should revert the toolstack patch and not
apply this one for now.  Then aim at using "-M pc" in 4.4 (and require
1.6 or 1.7), so that there is no need for a compatibility matrix.

Paolo