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From: Ian Campbell <ian.campbell@citrix.com>
Date: Wed, 10 Feb 2016 11:06:52 +0000
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Subject: [Qemu-devel] [PATCH v2 0/5] Drop support for Xen 4.1 and older from
	qemu-xen
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To: stefano.stabellini@eu.citrix.com, qemu-devel@nongnu.org
Cc: xen-devel <xen-devel@lists.xen.org>

This is most easily explained by the commit log of the first patch:

=C2=A0 =C2=A0 Xen 4.2 become unsupported upstream in 09/2015 (see
=C2=A0=C2=A0=C2=A0=C2=A0http://wiki.xen.org/wiki/Xen_Release_Features). How=
ever as far as the
=C2=A0=C2=A0=C2=A0=C2=A0interfaces provided by the toolstack libraries go 4=
.2 and 4.3 are
=C2=A0=C2=A0=C2=A0=C2=A0indistinguishable.
=C2=A0=C2=A0=C2=A0=C2=A0
=C2=A0=C2=A0=C2=A0=C2=A0Therefore drop support for Xen 4.1 and earlier whic=
h removes a whole
=C2=A0=C2=A0=C2=A0=C2=A0pile of compatibility code which makes future work =
(to use stable
=C2=A0=C2=A0=C2=A0=C2=A0library interfaces provided by upstream) more diffi=
cult. In particular
=C2=A0=C2=A0=C2=A0=C2=A0all supported versions now use a pointer as a libxc=
 handle (4.1 and
=C2=A0=C2=A0=C2=A0=C2=A0earlier used an integer, resulting in various shim =
layers).
=C2=A0=C2=A0=C2=A0=C2=A0
=C2=A0=C2=A0=C2=A0=C2=A0Also Xen 4.2 was the first version of Xen to formal=
ly support upstream
=C2=A0=C2=A0=C2=A0=C2=A0QEMU (as a preview) so that makes sense as a cut-of=
f now.

The rest of the patches are just further cleanups which become possible.