From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([208.118.235.92]:58277)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <gceq-qemu-devel@m.gmane.org>) id 1UhgQJ-0004qt-JV
	for qemu-devel@nongnu.org; Wed, 29 May 2013 09:28:17 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <gceq-qemu-devel@m.gmane.org>) id 1UhgQI-00077X-7m
	for qemu-devel@nongnu.org; Wed, 29 May 2013 09:28:15 -0400
Received: from plane.gmane.org ([80.91.229.3]:56247)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <gceq-qemu-devel@m.gmane.org>) id 1UhgIO-0004AH-HK
	for qemu-devel@nongnu.org; Wed, 29 May 2013 09:20:04 -0400
Received: from list by plane.gmane.org with local (Exim 4.69)
	(envelope-from <gceq-qemu-devel@m.gmane.org>) id 1UhgIN-00064V-1E
	for qemu-devel@nongnu.org; Wed, 29 May 2013 15:20:03 +0200
Received: from august.inf.tu-dresden.de ([141.76.48.124])
	by main.gmane.org with esmtp (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <qemu-devel@nongnu.org>; Wed, 29 May 2013 15:20:03 +0200
Received: from jsteckli by august.inf.tu-dresden.de with local (Gmexim 0.1
	(Debian)) id 1AlnuQ-0007hv-00
	for <qemu-devel@nongnu.org>; Wed, 29 May 2013 15:20:03 +0200
From: Julian Stecklina <jsteckli@os.inf.tu-dresden.de>
Date: Wed, 29 May 2013 14:32:50 +0200
Message-ID: <ko4shc$k52$1@ger.gmane.org>
References: <CAA2XHbf4zH-PR827Wwj9z-C-An0+7Ag8_muRS4zsRqVUo7Sb6Q@mail.gmail.com>
	<20130527093409.GH21969@stefanha-thinkpad.redhat.com>
	<CAA2XHbc=+OAAhjMPXDT6+PFVs+uSBN+ZVZHkEPZ-=Q_WtRYG4w@mail.gmail.com>
	<51A496C4.1020602@os.inf.tu-dresden.de>
	<87r4grca4p.fsf@codemonkey.ws>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
In-Reply-To: <87r4grca4p.fsf@codemonkey.ws>
Subject: Re: [Qemu-devel] snabbswitch integration with QEMU for userspace
	ethernet I/O
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: qemu-devel@nongnu.org

On 05/28/2013 07:00 PM, Anthony Liguori wrote:
> We aren't going to support any interface that enables out of tree
> devices.  This is just plugins in a different form with even more
> downsides.  You cannot easily keep track of dirty info, the guest
> physical address translation to host is difficult to keep in sync
> (imagine the complexity of memory hotplug).

Is there a document describing the current qemu VM migration process,
especially the dirty page tracking, except the code?

As a side note: The downsides of a naive approach are about that of PCI
passtrough devices with the opportunity to fix them later on. That being
said, I can live with this not being included in mainline qemu.

Julian