From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56973) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WsGI3-00009V-4E for qemu-devel@nongnu.org; Wed, 04 Jun 2014 14:52:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WsGHt-0002C4-9B for qemu-devel@nongnu.org; Wed, 04 Jun 2014 14:51:59 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44206) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WsGHt-0002Br-0B for qemu-devel@nongnu.org; Wed, 04 Jun 2014 14:51:49 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s54IplQS023118 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Wed, 4 Jun 2014 14:51:47 -0400 Date: Wed, 4 Jun 2014 19:51:43 +0100 From: "Dr. David Alan Gilbert" Message-ID: <20140604185142.GM2618@work-vm> References: <1401276034-30486-1-git-send-email-dgilbert@redhat.com> <5385CC10.6030909@redhat.com> <20140528120444.GE2372@work-vm> <871tv7bhyn.fsf@blackfin.pond.sub.org> <20140602135004.GF2634@work-vm> <538C9D74.3020204@redhat.com> <20140602164032.GG2634@work-vm> <538CB6DF.3050907@redhat.com> <20140602174411.GH2634@work-vm> <538CD925.4060301@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <538CD925.4060301@redhat.com> Subject: Re: [Qemu-devel] [PATCH 0/3] Migrate with destination version List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: Markus Armbruster , quintela@redhat.com, Laszlo Ersek , qemu-devel@nongnu.org, lcapitulino@redhat.com * Paolo Bonzini (pbonzini@redhat.com) wrote: > Il 02/06/2014 19:44, Dr. David Alan Gilbert ha scritto: > >>> If the version-based interface turns out to be not enough, we've done the > >>> work for nothing. In fact, we already know that it is not enough to solve > >>> 2.0->1.6 migration with -M pc-1.5. > >Remind me, why doesn't it solve that? > >(It would be a pain to implement but if this is just the pci host format > >I believe it would be doable) > > Sorry, it does solve 2.0->1.6 but it would not solve 1.6->2.0. Right, I'm only intending this to solve the problem of allowing you to migrate to an earlier broken version while not having to keep that breakage as you migrate forward. The easy example would be 1.6.2->1.6.1 while also allowing 1.6.2->2.0. Dave -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK