From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:46495)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <dgibson@ozlabs.org>) id 1UwNYM-000790-FL
	for qemu-devel@nongnu.org; Mon, 08 Jul 2013 22:21:25 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <dgibson@ozlabs.org>) id 1UwNYE-00061R-3L
	for qemu-devel@nongnu.org; Mon, 08 Jul 2013 22:21:18 -0400
Date: Tue, 9 Jul 2013 09:57:01 +1000
From: David Gibson <david@gibson.dropbear.id.au>
Message-ID: <20130708235701.GE2696@voom.redhat.com>
References: <1372315560-5478-1-git-send-email-aik@ozlabs.ru>
	<1372315560-5478-4-git-send-email-aik@ozlabs.ru>
	<877gh029hi.fsf@codemonkey.ws>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="WK3l2KTTmXPVedZ6"
Content-Disposition: inline
In-Reply-To: <877gh029hi.fsf@codemonkey.ws>
Subject: Re: [Qemu-devel] [PATCH 03/17] savevm: Implement VMS_DIVIDE flag
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: Anthony Liguori <aliguori@us.ibm.com>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>, qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>, qemu-ppc@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>, Paul Mackerras <paulus@samba.org>


--WK3l2KTTmXPVedZ6
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Mon, Jul 08, 2013 at 01:27:05PM -0500, Anthony Liguori wrote:
> Alexey Kardashevskiy <aik@ozlabs.ru> writes:
>=20
> > From: David Gibson <david@gibson.dropbear.id.au>
> >
> > The vmstate infrastructure includes a VMS_MULTIPY flag, and associated
> > VMSTATE_VBUFFER_MULTIPLY helper macro.  These can be used to save a
> > variably sized buffer where the size in bytes of the buffer isn't direc=
tly
> > accessible as a structure field, but an element count from which the si=
ze
> > can be derived is.
>=20
> Why?  What's the point of sending the total size vs. the element
> count?

Because it's more convenient to work with the total size at runtime,
and because the VMSTATE stuff works with actual structure fields,
there's not really a way to convert it at migrate time, short of this.

--=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

--WK3l2KTTmXPVedZ6
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.13 (GNU/Linux)

iEYEARECAAYFAlHbUc0ACgkQaILKxv3ab8a96QCdEHExKzrxDBisS5efFW0FPNfV
eJ0Ani9LTKlgUZ0kbshsi1UaTD4zg+YM
=UFFt
-----END PGP SIGNATURE-----

--WK3l2KTTmXPVedZ6--