K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2013-05-01T20:03:50.381954Z
K 7
svn:log
V 436
The check to ensure that xstate_bv always has XFEATURE_ENABLED_X87 and
XFEATURE_ENABLED_SSE bits set is not needed.  CPU correctly handles
any bitmask which is subset of the enabled bits in %XCR0.

More, CPU instructions XSAVE and XSAVEOPT could write the mask without
e.g. XFEATURE_ENABLED_SSE, after the VZEROALL.  The check prevents the
restoration of the otherwise valid FPU save area.

In collaboration with:	jhb
MFC after:	1 week

END