From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45564) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YsoRN-0000x6-5R for qemu-devel@nongnu.org; Thu, 14 May 2015 04:24:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YsoRJ-0003xF-Qs for qemu-devel@nongnu.org; Thu, 14 May 2015 04:24:25 -0400 Received: from mail-wg0-x229.google.com ([2a00:1450:400c:c00::229]:36122) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YsoRJ-0003wU-KX for qemu-devel@nongnu.org; Thu, 14 May 2015 04:24:21 -0400 Received: by wgbhc8 with SMTP id hc8so33656498wgb.3 for ; Thu, 14 May 2015 01:24:21 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <55545BAF.4040701@redhat.com> Date: Thu, 14 May 2015 10:24:15 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <1431528122-50960-1-git-send-email-cornelia.huck@de.ibm.com> <1431528122-50960-2-git-send-email-cornelia.huck@de.ibm.com> <20150513165438-mutt-send-email-mst@redhat.com> <20150513170335.2d662124.cornelia.huck@de.ibm.com> <20150513180005-mutt-send-email-mst@redhat.com> In-Reply-To: <20150513180005-mutt-send-email-mst@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH RFC 1/1] virtio: migrate config_vector List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael S. Tsirkin" , Cornelia Huck Cc: borntraeger@de.ibm.com, qemu-devel@nongnu.org, jjherne@linux.vnet.ibm.com On 13/05/2015 18:14, Michael S. Tsirkin wrote: > > - AFAICS, there's no easy way to add transport-specific subsections - > > and simply adding config_vector in ccw would break compatibility > > subsections break compatibility too. The only way around that is to set > a flag to skip migrating config_vector for old machine types. That's expected. Subsections break compatibility because sometimes breaking migration is better than leaving a broken guest after migration. Paolo