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This bug has been copied from bug #703055 and has been proposed
to be backported to 6.1 z-stream (EUS).

Reproduced on kernel-2.6.32-131.4.1.el6: guest crashes with 16G.

Verified on kernel-2.6.32-131.6.1.el6. Tested 8G, 16G, 32G. All passed.

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
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    New Contents:
Prior to this update, Red Hat Enterprise Linux Xen (up to version 5.6) did not hide 1 GB pages and RDTSCP (enumeration features of CPUID), causing guest soft lock ups on AMD hosts when the guest's memory was greater than 8 GB. With this update, a Red Hat Enterprise Linux 6 HVM (Hardware Virtual Machine) guest is able to run on Red Hat Enterprise Linux Xen 5.6 and lower.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0928.html