Konstantin Belousov 9f2a3e3b0a Fix pmap_pti_add_kva() call for doublefault stack page.
After r354889 stack got struct nmi_pcpu at top, which makes IST top
not page-aligned.  Since pmap_pti_add_kva() truncates/rounds up
addresses, it erronously entered a page mapped before double fault
stack into the pti page table.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
2020-10-03 23:11:20 +00:00
..
2020-10-02 20:52:09 +00:00