We've identified a workaround that can get the VM uuid:

root@ubuntulucidlynx1004:~# xenstore-read domid
2
root@ubuntulucidlynx1004:~# xenstore-read /local/domain/2/vm
/vm/6fddd486-b376-647d-d7d4-9acf0e164722

It is the /vm/<uuid> path which has the incorrect permissions, however
the UUID is in /local/domain/<domid>/vm which is all that is needed for
nova to identify itself to the host.

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https://bugs.launchpad.net/bugs/1081182

Title:
  issues accessing /sys/hypervisor/uuid when rebooting VM

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