On Wed, 10 Feb 2016, Ian Campbell wrote:
> This is most easily explained by the commit log of the first patch:
>
> Xen 4.2 become unsupported upstream in 09/2015 (see
> http://wiki.xen.org/wiki/Xen_Release_Features). However as far as the
> interfaces provided by the toolstack libraries go 4.2 and 4.3 are
> indistinguishable.
>
> Therefore drop support for Xen 4.1 and earlier which removes a whole
> pile of compatibility code which makes future work (to use stable
> library interfaces provided by upstream) more difficult. In particular
> all supported versions now use a pointer as a libxc handle (4.1 and
> earlier used an integer, resulting in various shim layers).
>
> Also Xen 4.2 was the first version of Xen to formally support upstream
> QEMU (as a preview) so that makes sense as a cut-off now.
>
> The rest of the patches are just further cleanups which become possible.
I committed this series to my "next" branch.
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