From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60343) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aWTFc-00085j-NP for qemu-devel@nongnu.org; Thu, 18 Feb 2016 13:24:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aWTFZ-0007D9-9S for qemu-devel@nongnu.org; Thu, 18 Feb 2016 13:24:28 -0500 Received: from mail-wm0-x22c.google.com ([2a00:1450:400c:c09::22c]:37311) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aWTFZ-0007Cg-2h for qemu-devel@nongnu.org; Thu, 18 Feb 2016 13:24:25 -0500 Received: by mail-wm0-x22c.google.com with SMTP id g62so38250116wme.0 for ; Thu, 18 Feb 2016 10:24:25 -0800 (PST) Sender: Paolo Bonzini References: <1374533797.187583648.1455818058856.JavaMail.zimbra@oxygem.tv> From: Paolo Bonzini Message-ID: <56C60C56.3010803@redhat.com> Date: Thu, 18 Feb 2016 19:24:22 +0100 MIME-Version: 1.0 In-Reply-To: <1374533797.187583648.1455818058856.JavaMail.zimbra@oxygem.tv> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Unable to migrate pc-i440fx-2.4 KVM guest from QEMU 2.5.0 to QEMU 2.4.1 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexandre DERUMIER , qemu-devel On 18/02/2016 18:54, Alexandre DERUMIER wrote: > Hi, > > I (and promox users) have same problem than this bugreport > > https://bugs.launchpad.net/qemu/+bug/1536487 > https://forum.proxmox.com/threads/cant-live-migrate-after-dist-upgrade.26097/ > > Migrating from qemu 2.5 with pc-i440fx-2.4 to qemu 2.4.1 don't work. > qemu-system-x86_64: error while loading state for instance 0x0 of device 'fw_cfg' While I agree that this is a bug worth fixing, note that in general migration from new to old versions is _not_ supported. Usually it works, but not always, and sometimes it's not a bug. Machine types are only meant to support migration from old versions to new. Paolo