Xen devices are not always caught by the SUBSYSTEMS=="xen" clause, so explictly
add their registered MAC prefix:
http://www.coffer.com/mac_find/?string=00%3A16%3A3E
https://launchpad.net/bugs/897789
ENV{MATCHADDR}=="52:54:ab:*", GOTO="globally_administered_whitelist"
# Kingston Technologies
ENV{MATCHADDR}=="e2:0c:0f:*", GOTO="globally_administered_whitelist"
+# Xensource
+ENV{MATCHADDR}=="00:16:3e:*", GOTO="globally_administered_whitelist"
# match interface dev_id
ATTR{dev_id}=="?*", ENV{MATCHDEVID}="$attr{dev_id}"