Comment 27 for bug 1304001

This warning implies that SRAT may be wrong. And I just noticed that this may not be vanilla 4.2:
 [ 0.000000] DMI: Xen HVM domU, BIOS 4.2.amazon 01/24/2014

Are we on a custom HVM BIOS? That's where memory is described to domain.

Although NUMA issue may be somewhat orthogonal, it still may be worh looking at. Andrew, can you do this on booted guest:

   acpidump > acpi.dat
   acpixtract -a acpi.dat
   iasl -d srat.dat

and post here srat.dsl

And again, seeing guest config file would be important.