From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:44747)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <eblake@redhat.com>) id 1aOoRt-0000fm-EP
	for qemu-devel@nongnu.org; Thu, 28 Jan 2016 10:25:30 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <eblake@redhat.com>) id 1aOoRr-0000hi-SP
	for qemu-devel@nongnu.org; Thu, 28 Jan 2016 10:25:29 -0500
References: <CCBF57B7-04B8-47E9-8786-DB7DE786969B@alex.org.uk>
	<56A92CC5.9070403@redhat.com>
	<AD328CF0-9F95-4C64-84F1-32DCF1413A0F@alex.org.uk>
From: Eric Blake <eblake@redhat.com>
Message-ID: <56AA32DE.80005@redhat.com>
Date: Thu, 28 Jan 2016 08:25:18 -0700
MIME-Version: 1.0
In-Reply-To: <AD328CF0-9F95-4C64-84F1-32DCF1413A0F@alex.org.uk>
Content-Type: multipart/signed; micalg=pgp-sha256;
	protocol="application/pgp-signature";
	boundary="iiP7Wf9DL9mjoTTUOGTbRuol3ae3udXiI"
Subject: Re: [Qemu-devel] QCOW rebases on running VMs
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Alex Bligh <alex@alex.org.uk>
Cc: Alberto Garcia <berto@igalia.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, qemu block <qemu-block@nongnu.org>

This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
--iiP7Wf9DL9mjoTTUOGTbRuol3ae3udXiI
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

On 01/28/2016 05:36 AM, Alex Bligh wrote:
>=20
> On 27 Jan 2016, at 20:47, Eric Blake <eblake@redhat.com> wrote:
>=20
>>>
>>>
>>> If not, do I need to use QMP magic instead?
>>
>> Yes. block-commit is your friend.
>=20
> Sadly what I need is block-stream to an intermediate layer (as I
> want to merge in the other direction); I don't think that proposal
> was ever implemented.
>=20
> http://wiki.qemu.org/Features/Snapshots#Streaming_to_an_Intermediate_La=
yer_.5Bproposal.5D

Alberto was working on it last; this was the most recent mail I found on
the topic (just to the qemu-block list):
https://lists.gnu.org/archive/html/qemu-block/2015-12/msg00214.html

so although I recall some RFC patches having been posted, you are right
that it still needs some work to be merged in.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


--iiP7Wf9DL9mjoTTUOGTbRuol3ae3udXiI
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
Comment: Public key at http://people.redhat.com/eblake/eblake.gpg
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iQEcBAEBCAAGBQJWqjLeAAoJEKeha0olJ0NqBIUIAJQb0WE0amqRebqWjCjzDP7c
MHGRlUXgSNDlFCT1pNWSFhxXsQfbReFvBiQrjHqWgq5SeuHfybqic2nM8vCMDQkk
8di1l84AagzYzUarNPYplybMag56B98G0HOPNhijKh0r9Z37CYYWEyy6cgwmkx7q
RRaT6bkBXAbjxCSnn43IdNWvwYNlKIXYu9GFArgVpb59XU8ho5WbhtAEuph66sL/
N5eNhzJF/btn/PijC/V2u+/JMHzX66zO0n47yT0kgdtlFKcLCE9Lx7Zaf9pBN0zY
p5faQPC7jdwpy4EGlvNnCGhvyliF6YEIjORCnODtMXR6bSmmMjfgSeLGtObBV+8=
=Qi6j
-----END PGP SIGNATURE-----

--iiP7Wf9DL9mjoTTUOGTbRuol3ae3udXiI--