From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=57043 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OGfth-00084r-AC for qemu-devel@nongnu.org; Mon, 24 May 2010 18:13:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OGftD-0007eE-SX for qemu-devel@nongnu.org; Mon, 24 May 2010 18:13:21 -0400 Received: from fmmailgate03.web.de ([217.72.192.234]:51481) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OGftD-0007e4-F9 for qemu-devel@nongnu.org; Mon, 24 May 2010 18:12:51 -0400 Message-ID: <4BFAF9CE.8010706@web.de> Date: Tue, 25 May 2010 00:12:30 +0200 From: Jan Kiszka MIME-Version: 1.0 Subject: Re: [Qemu-devel] Re: [PATCH v2 12/15] monitor: Add basic device state visualization References: <1f557b9feb1965a61e64f7166bcf4918bed8d0ec.1274516288.git.jan.kiszka@web.de> <4BF82895.6000706@redhat.com> <4BFAE004.6090501@codemonkey.ws> <4BFAE302.40806@web.de> <4BFAF477.4030303@linux.vnet.ibm.com> In-Reply-To: <4BFAF477.4030303@linux.vnet.ibm.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig677E01EF6048C868EE0B3C2A" Sender: jan.kiszka@web.de List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: Juan Quintela , Jan Kiszka , qemu-devel@nongnu.org, Luiz Capitulino , Avi Kivity , Markus Armbruster This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig677E01EF6048C868EE0B3C2A Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Anthony Liguori wrote: > On 05/24/2010 03:35 PM, Jan Kiszka wrote: >> In contrast to save/loadvm, device_show does not provide a >> backward-compatible output. Not only field names can change (as a resu= lt >> of internal refactoring), >=20 > Field names could change, but that seems unlikely and unnecessary. Actually, this may happen to improve the output format for device_show, either via renaming the fields or annotating it (once we have the latter mechanism). >=20 >> fields may even disappear, >=20 > That would break live migration.=20 Nope. We can (and I think we did before) perfectly read some field up to version X and convert it into the new format but skip that field for X+1 upward. > The output of device_show when > specifying -M pc-0.13 should always be the same. If it's not, I believ= e > that's a bug. >=20 > The output of device_show across multiple qemu versions without > specifying a -M could certainly be different but that's to be expected > since you have a different hardware model. It will be different as soon as the version_id of a dumped vmstate changes, even independent of -M. Jan --------------enig677E01EF6048C868EE0B3C2A Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iEYEARECAAYFAkv6+dEACgkQitSsb3rl5xTqlQCg1tHP9eG2kMsdlZjVz0RE300l 9B4AoI1T/J7xF6qyYmeUXi0uVc1/Hpw4 =Txb0 -----END PGP SIGNATURE----- --------------enig677E01EF6048C868EE0B3C2A--