Without theses changes from sles11sp2 installation in
a Xen HVM guest can not work in factory because the
installer uses kexec to boot into second stage..

- Fix xen cpuid() inline asm to not clobber stack's red zone
See xen-unstable changeset 24344:72f4e4cb7440

- Balloon up in a Xen PVonHVM guest before kexec (bnc#694863)
- Update xen_present check for xenfs in pv_ops kernel (bnc#694863)
- Change xen_present hv check (bnc#658413)