[ale] Xen PV issue

[DJPfulio at jdpfu.com (DJ-Pfulio)]

https://xenbits.xen.org/xsa/advisory-212.html

"A malicious or buggy 64-bit PV guest may be able to access all of
system memory, allowing for all of privilege escalation, host crashes,
and information leaks."

Does not impact HVMs, just PVs.

Get ready to patch.