From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33980) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xaj1n-0004zw-D0 for qemu-devel@nongnu.org; Sun, 05 Oct 2014 06:27:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Xaj1m-0005hA-Le for qemu-devel@nongnu.org; Sun, 05 Oct 2014 06:26:59 -0400 Received: from mail.avalus.com ([2001:41c8:10:1dd::10]:42705) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xaj1m-0005gw-G0 for qemu-devel@nongnu.org; Sun, 05 Oct 2014 06:26:58 -0400 Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) From: Alex Bligh In-Reply-To: <5430EC7B.2070009@redhat.com> Date: Sun, 5 Oct 2014 11:26:40 +0100 Content-Transfer-Encoding: 7bit Message-Id: References: <1411414496-46245-1-git-send-email-alex@alex.org.uk> <1411414496-46245-2-git-send-email-alex@alex.org.uk> <20140928153058.GA4994@redhat.com> <87fvfavrho.fsf@blackfin.pond.sub.org> <5430EC7B.2070009@redhat.com> Subject: Re: [Qemu-devel] [PATCH v4] Add machine parameter qemu-kvm-migration for live migrate compatibility with qemu-kvm List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: Ryan Harper , Serge Hallyn , "quintela@redhat.com" , Libvirt , Serge Hallyn , Markus Armbruster , "qemu-devel@nongnu.org" , Alexander Graf , "Michael S. Tsirkin" , Alex Bligh , Cole Robinson , Amit Shah , Bruce Rogers , =?windows-1252?Q?Andreas_F=E4rber?= , "Serge E. Hallyn" On 5 Oct 2014, at 08:00, Paolo Bonzini wrote: > Il 29/09/2014 09:02, Markus Armbruster ha scritto: >>> If you were just objecting to the fact that pc-1.0 was made to >>> be an alias of either one or the other at compile time, simply >>> drop the second patch of the v2 patchset. > > I was objecting to making pc-1.0 special. There's nothing special in > pc-1.0, other machine types also had differences between qemu-kvm and > qemu. And I do not think that upstream has any reason to make pc-1.0 > special. OK, so in v5, pc-1.0 is unchanged, and not made special. A new machine type is added which allows import from something (unfortunately) called pc-1.0 in something in qemu's past, as well as some distributions. > So, if Ubuntu is okay with breaking pc-1.0 migration from 14.04-old to > 14.04-new, the right thing to do is simply that Ubuntu makes its pc-1.0 > machine type the qemu-kvm one. No new machine types, no aliases, no > anything. That would not allow Ubuntu (or Suse - similarly affected I think) to import pc-1.0 VMs from things actually running pc-1.0, and would mean that newly created pc-1.0 VMs would be 'wrong', perpetuating the problem. -- Alex Bligh