From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43279) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aXez7-0004u0-LD for qemu-devel@nongnu.org; Sun, 21 Feb 2016 20:08:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aXez6-00056F-8W for qemu-devel@nongnu.org; Sun, 21 Feb 2016 20:08:21 -0500 Date: Mon, 22 Feb 2016 12:09:12 +1100 From: David Gibson Message-ID: <20160222010912.GB2808@voom.fritz.box> References: <20160218113211.9760.85475.stgit@bahia.huguette.org> <20160219001147.GN15224@voom.fritz.box> <20160219085944.281f4a73@bahia.huguette.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="24zk1gE8NUlDmwG9" Content-Disposition: inline In-Reply-To: <20160219085944.281f4a73@bahia.huguette.org> Subject: Re: [Qemu-devel] [PATCH v3 0/2] Fix migration of old pseries List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Greg Kurz Cc: Laurent Vivier , Juan Quintela , qemu-devel@nongnu.org, "Dr. David Alan Gilbert" , qemu-ppc@nongnu.org, Amit Shah --24zk1gE8NUlDmwG9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Feb 19, 2016 at 08:59:44AM +0100, Greg Kurz wrote: > On Fri, 19 Feb 2016 11:11:47 +1100 > David Gibson wrote: >=20 > > On Thu, Feb 18, 2016 at 12:32:11PM +0100, Greg Kurz wrote: > > > QEMU 2.4 broke the migration of old pseries machine with the addition > > > of configuration sections, which are sent unconditionally. > > >=20 > > > We assume that QEMU 2.3 is more deployed than any newer release (base= d on > > > the versions currently shipped by most distros). This v3 series hence > > > reverses the logic from v2: it now fully fixes migration of old pseri= es > > > from/to QEMU 2.3 and provides a manual workaround for the QEMU 2.4/2.= 4.1/2.5 > > > case. > > >=20 > > > With this series, I could migrate the same pseries-2.3 instance in a = full > > > 2.3->2.6->2.5->2.6->2.4->2.6->2.3 cycle. =20 > >=20 > > Sorry, I've lost track slightly here. Does this series apply on top > > of, or instead of your earlier series that peeks for the config > > section? > >=20 >=20 > This v3 series applies instead of the v2 that peeks for the config sectio= n. Ok, thanks for the clarification. > It was suggested by Laurent during review, and motivated by your decision > to favor fixing 2.3 over 2.4. >=20 > As shown in Laurent's detailed test report, migration from/to 2.3.x now w= orks > out of the box and 2.4.x/2.5 requires qom-set. >=20 > I was also feeling a bit uncomfortable with all these machine properties = to > disable the configuration section, which was explicitly coded to be non-o= ptional > according to the changelog of commit 61964c23. The logic inversion in v3 = seem > to be friendlier with the configuration section design. >=20 > Juan, could you share your thoughts ? With an ack from Juan I'll be happy to merge this to ppc-for-2.6. --=20 David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson --24zk1gE8NUlDmwG9 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJWyl+4AAoJEGw4ysog2bOSAE0QAJWKiCkvSRNeL6M0cdxLuHs9 P6rMuwzO58YbN62mI6pbGDR/+qiORbxG7Le2qYv28n6B4kbjJlbj0w9ig7OckgLU 3npLgLMaq5EJYQpa60DxrPj6J7L6WIRMwrSXbgk6O3ISER+5RmPktD8upgFjZS4P 37FlUf9pWKc8JC1lXcu6nMg0pLndxqnsD28Yg+iNux9gJzdEgYLFgsDuCTnurlh+ frRxz0VEQ9Nl9P0B1rMBJssprtm4FB1LfhZfJ4Y1cz/HnOTTEYQwS2wQMhRe1E8W IafQrPv5ErxVrSLzWHVfvWizbigwIcgwyPuwcFGWMN13NQv1DRgXqg62lRFpzUAq lBcyv9e7Ry1wCvQhYstEq9SWGsWkpGnmLh8Dul/yRFRXK5W8xAKMaHyKJ4HQ3d9V xiD3pO/HMzJmv8hvrz927ipdP6pAwUsrm+gHpQZiUF1KoMJWvD7PQt4Wf1px96Le RCAqaQYHPa+IXXXGcTrlRweROsIHaPmKcXE18eHxriKHsmOwwJE+sHsv2ac+Fwb1 24p3JtCwqoewoSt7s6paZl9tINhlLmuEbcDL22yEykrk8CuVI0pWFNrlwHOlIXVI 0ozUXKQ2InGTcedsptli02rOCBMNKjbJ7v10xbX+S7fgOQnyeQaekjrtW4bpM6zg JIlYUN9r2lQkdBXYBiEW =JU7K -----END PGP SIGNATURE----- --24zk1gE8NUlDmwG9--