Konstantin Belousov 45c228cc29 Fix PCID+PTI pmap operations on Xen/HVM.
Install appropriate pti-aware shootdown IPI handlers, otherwise user
page tables do not get enough invalidations.  The non-pti handlers
were used so far.

Reported and tested by:	cperciva
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
2018-05-19 20:28:59 +00:00
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