Mark Johnston e362e590f9 Don't attempt to measure TSC skew when running as a VM guest.
It simply doesn't work in general since VCPUs may migrate between
physical cores.  The approach used to measure skew also doesn't
make much sense in a VM.

PR:		218452
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
2019-03-21 02:52:22 +00:00
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