[Xen-devel] [PATCH 0/5] Drop support for Xen 4.1 and older from qemu-xen

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

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

  Xen 4.2 become unsupported upstream in 09/2105 (see
ÂÂÂÂhttp://wiki.xen.org/wiki/Xen_Release_Features). However as far as the
ÂÂÂÂinterfaces provided by the toolstack libraries go 4.2 and 4.3 are
ÂÂÂÂindistinguishable.
ÂÂÂÂ
ÂÂÂÂTherefore drop support for Xen 4.1 and earlier which removes a whole
ÂÂÂÂpile of compatibility code which makes future work (to use stable
ÂÂÂÂlibrary interfaces provided by upstream) more difficult. In particular
ÂÂÂÂall supported versions now use a pointer as a libxc handle (4.1 and
ÂÂÂÂearlier used an integer, resulting in various shim layers).
ÂÂÂÂ
ÂÂÂÂAlso Xen 4.2 was the first version of Xen to formally support upstream
ÂÂÂÂQEMU (as a preview) so that makes sense as a cut-off now.

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

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