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bhyve: Use MAP_GUARD when mapping guest memory ranges.
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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

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Provenance
jhbAuthored on Sep 6 2018, 8:29 PM

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