Konstantin Belousov 5a17538e22 Do not try to enable new features in the %cr4 if running under
hypervisor.  Apparently, hypervisors failed to filter out 'Standard
Extended Features' report from CPUID, but deliver #gp when
corresponding bit in %cr4 is toggled.

This shall be reconsidered later, after hypervisors correct the bug.

Reported and tested by:	joel
Reviewed by:	avg
MFC after:	2 weeks
2012-11-09 16:00:30 +00:00
..
2012-10-10 08:36:38 +00:00