amd64: Zero the PML5 PTI page when initializing a pmap
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Authored by markj on Oct 16 2021, 9:20 PM.

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alc
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rGb0423d0f5eec: amd64: Zero the PML5 PTI page when initializing a pmap

Summary

The root page is not zeroed at allocation time since with 4-level tables
each entry is copied from a template. However, with 5-level tables only
a single entry is filled, so the rest need to be cleared.

Reported by: alc

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rG FreeBSD src repository

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Event Timeline

markj created this revision.Oct 16 2021, 9:20 PM

Herald added a subscriber: imp. · View Herald TranscriptOct 16 2021, 9:20 PM

markj requested review of this revision.Oct 16 2021, 9:20 PM

Harbormaster completed remote builds in B42173: Diff 96964.Oct 16 2021, 9:20 PM

alc accepted this revision.Oct 16 2021, 9:44 PM

This revision is now accepted and ready to land.Oct 16 2021, 9:44 PM

kib accepted this revision.Oct 16 2021, 9:47 PM

Closed by commit rGb0423d0f5eec: amd64: Zero the PML5 PTI page when initializing a pmap (authored by markj). · Explain WhyOct 18 2021, 2:08 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rGb0423d0f5eec: amd64: Zero the PML5 PTI page when initializing a pmap.

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sys/

amd64/

pmap.c

1 line

Diff 97058

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amd64: Zero the PML5 PTI page when initializing a pmapClosedPublicActions