Bug#505517: Additional Limitation on Xen + Grub2

[Ian MacDonald]

Although the kernel loads as per our comments, there is a problem in
that it is not yet supported by Grub2. Only Xen 3.4 or newer are
supported. There is a grub2 patch for i386, as noted below.
http://lists.gnu.org/archive/html/grub-devel/2009-06/msg00219.html

Some evidence of others with this too, likely same issue
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=516610 

We have checked upstream (sid) changelogs, as well as backports for
either a Xen >=3.4 options or newer Grub2 with this resolved with no
luck.  For us and new 2TB disks with GPT, this has effectively made a
great 1TB, 1.5TB recipe for RAID+Crypto+LVM+Xen+iSCSI non-workable.