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bhyve: Use MAP_GUARD when mapping guest memory ranges.

Description

bhyve: Use MAP_GUARD when mapping guest memory ranges.

Instead of relying on PROT_NONE mappings with MAP_ANON, use MAP_GUARD
to reserve address space around guest memory ranges including the
guard ranges of address space around mappings.

Submitted by: Shawn Webb
Reviewed by: araujo
Approved by: re (rgrimes)
MFC after: 1 month
Sponsored by: HardendBSD and G2, Inc
Differential Revision: https://reviews.freebsd.org/D16822

Details

Committed
jhbSep 6 2018, 8:29 PM
Reviewer
araujo
Differential Revision
D16822: bhyve: Use MAP_GUARD guard pages
Parents
rS338510: Use the correct terminology.
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