K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2018-02-14T23:35:47.918893Z
K 7
svn:log
V 595
x86 pmap: Make memory mapped via pmap_qenter() non-executable

The idea is, the pmap_qenter() API is now defined to not produce executable
mappings.  If you need executable mappings, use another API.

Add pg_nx flag in pmap_qenter on x86 to make kernel pages non-executable.

Other architectures that support execute-specific permissons on page table
entries should subsequently be updated to match.

Submitted by:	Darrick Lew <darrick.freebsd AT gmail.com>
Reviewed by:	markj
Discussed with:	alc, jhb, kib
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D14062

END