amd64: Zero the PML5 PTI page when initializing a pmap
ClosedPublic
Actions

Authored by markj on Oct 16 2021, 9:20 PM.

Tags

None

Referenced Files

	Unknown Object (File)
	Mon, Jul 20, 3:49 AM

	Unknown Object (File)
	Sun, Jul 19, 5:44 AM

	Unknown Object (File)
	Sat, Jul 18, 4:35 PM

	Unknown Object (File)
	Thu, Jul 9, 4:01 AM

	Unknown Object (File)
	Mon, Jul 6, 11:40 PM

	Unknown Object (File)
	May 4 2026, 4:38 PM

	Unknown Object (File)
	May 4 2026, 2:38 AM

	Unknown Object (File)
	Apr 30 2026, 8:10 AM

View All Files

Subscribers

imp

Details

Reviewers

alc
kib

Commits

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

Diff Detail

Repository

rG FreeBSD src repository

Lint

Lint Not Applicable

Unit

Tests Not Applicable

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.

Revision Contents
Changeset List

Path

Size

sys/

amd64/

pmap.c

1 line

Diff 97058

View Options

amd64: Zero the PML5 PTI page when initializing a pmapClosedPublicActions