RHEL 6 domU PV Xen guests cannot extend beyond 128GiB memory

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Issue

Why can RHEL 6 domU PV Xen guests not extend beyond 128GiB memory, when RHEL 5 equivalent guests can extend to 168Gib?
I am not able to extend a RHEL 6 paravirtualized guest beyond 128 GiB of memory

Environment

Red Hat Enterprise Linux (RHEL) x86_64 Xen hosts
RHEL 6 x86_64 para-virtualized guests

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