kib 4184d62cd8 Set PG_G global mapping bit on the trampoline ptes.
Trampoline mappings are better treated as global since they are valid
in all address spaces, even for PTI.  pmap_invalidate_range() must work
on global mappings for pti since kernel_pmap invalidations are really
same as for non-PTI.

Reviewed by:	alc, markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 month
Differential revision:	https://reviews.freebsd.org/D15052
2018-04-14 17:33:16 +00:00
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