From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:56186) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Qf9Uu-0001yk-RP for qemu-devel@nongnu.org; Fri, 08 Jul 2011 07:45:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Qf9Ut-00078h-4K for qemu-devel@nongnu.org; Fri, 08 Jul 2011 07:45:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:16066) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Qf9Us-00078Z-MO for qemu-devel@nongnu.org; Fri, 08 Jul 2011 07:45:26 -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 p68BjOqV016570 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Fri, 8 Jul 2011 07:45:24 -0400 From: Markus Armbruster References: <1310115239-19288-1-git-send-email-kraxel@redhat.com> <4E16D3D8.60908@redhat.com> <4E16D4EF.5020903@redhat.com> Date: Fri, 08 Jul 2011 13:45:22 +0200 In-Reply-To: <4E16D4EF.5020903@redhat.com> (Gerd Hoffmann's message of "Fri, 08 Jul 2011 11:59:11 +0200") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Subject: Re: [Qemu-devel] [PATCH 0/3] non-migratable devices List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Gerd Hoffmann Cc: Paolo Bonzini , qemu-devel@nongnu.org Gerd Hoffmann writes: > 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 ... Send them only when running a sufficiently recent -M?