I have just built xen 4.6.0-1 on rawhide, and if you want to test it on earlier Fedoras the same source has been built on my myoung/xentest copr repository (though you may have problems with qemu and libvirt if they are linked against earlier versions of xen).
Michael Young -- xen mailing list xen@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/xen