[Bug 217885] Intel 860 CPU Supports VT-x and EPT/ Only Shows Partial Support FreeNAS Corral

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217885

--- Comment #16 from Nathan Benson <online at nahlem.com> ---
So after more research and talking with the FreeNAS guys it suddenly clicked
for me. 

To work properly you need VT-x with EPT to be able to use unrestricted guests.
Great, dmesg clearly shows that for me:

  VT-x: PAT,HLT,MTF,PAUSE,EPT,VPID

However, someone posted theirs and it looked like this:

  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID

It finally dawned on me the UG flag stands for "Unrestricted Guest".

So, hopefully this will help everyone else in the same situation as we were,
being, Intel specs said we have VT-x and EPT (as did FreeBSD), but the CPU
flags didn't have UG. 

Upon more investigation it appears that UG came about in the Westmere and later
processors. Mine was Bloomfield, the architecture just previous. So, I bought
an Intel i7 860x which should have UG support. 

Many thanks guys and hopefully this will help clear up the issue for others and
give a more clear answer as to why in the future.

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