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Differential D47717

Tweaks for pmap_qremove() and transient mappings
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Authored by kib on Nov 23 2024, 9:07 PM.
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Details

Reviewers
alc
markj
Commits
rG6ec4ff70885d: amd64: switch pmap_map_io_transient() to use pmap_kenter_attr()
rG2d6923790b16: amd64 pmap: assert and explain why pmap_qremove() is safe WRT supermappings
Summary
amd64: switch pmap_map_io_transient() to use pmap_kenter_attr()

instead of constructing transient pte itself.  This pre-set PG_A and
PG_M bits, avoiding atomic pte update on access and modification.  Also
it set the nx bit, the mapping is not supposed to be used for executing.

amd64 pmap: assert and explain why pmap_qremove() is safe WRT supermappings

Based on alc@ comments from https://reviews.freebsd.org/D47678.

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rG FreeBSD src repository
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amd64/
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sys/amd64/amd64/pmap.c

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