Differential D55957

vm: Support swapping arm64 MTE tags
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Authored by andrew on Mar 19 2026, 4:06 PM.

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Subscribers

Details

Reviewers

manu
alc
kib
markj

Group Reviewers

Summary

When we swap out a page containing MTE tags we need to keep a copy of
them to be restored when the page is later restored. Add support to
allocate per-page tag storage that is used when a MTE tagged page is
moved to swap and populate this with the pages tags.

Sponsored by: Arm Ltd

Diff Detail

Repository

rG FreeBSD src repository

Lint

Lint Skipped

Unit

Tests Skipped

Build Status

Buildable 71538
Build 68421: arc lint + arc unit

Event Timeline

andrew created this revision.Mar 19 2026, 4:06 PM

Herald added a reviewer: manu. · View Herald TranscriptMar 19 2026, 4:06 PM

Herald added subscribers: emaste, imp. · View Herald Transcript

andrew requested review of this revision.Mar 19 2026, 4:06 PM

Harbormaster completed remote builds in B71538: Diff 173927.Mar 19 2026, 4:06 PM

andrew added a parent revision: D55956: arm64: Add PROT_MTE to mmap.Mar 19 2026, 4:07 PM

andrew added a child revision: D55958: arm64: mte: userspace configuration of MTE via sysarch() system call.

andrew added reviewers: alc, kib, markj.Mar 19 2026, 4:27 PM

Revision Contents
Changeset List

Path

Size

sys/

arm64/

arm64/

56 lines

include/

2 lines

vm/

90 lines

Diff 173927

sys/arm64/arm64/mte.c

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sys/arm64/include/cpu.h

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sys/vm/swap_pager.c

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