From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:59058) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Qf7q8-0007bA-QH for qemu-devel@nongnu.org; Fri, 08 Jul 2011 05:59:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Qf7q7-0006A7-KM for qemu-devel@nongnu.org; Fri, 08 Jul 2011 05:59:16 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57758) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Qf7q7-00069w-1f for qemu-devel@nongnu.org; Fri, 08 Jul 2011 05:59:15 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p689xEB2009871 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Fri, 8 Jul 2011 05:59:14 -0400 Message-ID: <4E16D4EF.5020903@redhat.com> Date: Fri, 08 Jul 2011 11:59:11 +0200 From: Gerd Hoffmann MIME-Version: 1.0 References: <1310115239-19288-1-git-send-email-kraxel@redhat.com> <4E16D3D8.60908@redhat.com> In-Reply-To: <4E16D3D8.60908@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 0/3] non-migratable devices List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: qemu-devel@nongnu.org Hi, > For scsi-cd and other empty-but-generally-migratable devices we should > probably add an empty vmstate, so that any further addition can be done > as subsections. That will break migration to older versions which don't know about the new sections, even if they are empty ... cheers, Gerd