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We needed to revert

commit c16ccd2dba7492cee6cfe4b80f4c49746fe85c96
Author: Igor Mammedov <imammedo>
Date:   Thu Dec 1 17:11:00 2011 -0500

    [virt] xen: mask MTRR feature from guest BZ#750758

at the last minute to support kdump for xen hvm guests. We should try and bring it back (while keeping kdump working).

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

This request was erroneously removed from consideration in Red Hat Enterprise Linux 6.4, which is currently under development.  This request will be evaluated for inclusion in Red Hat Enterprise Linux 6.4.

I'm not sure we want to post this again (maybe not worth it), but Igor has hardware to test with, so assigning to him.