amr64: Switch from PV_MTE_TAGGED to PV_MTE_CLEAN
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Authored by andrew on Wed, Jul 1, 10:10 AM.

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Summary

The new flag marks pages where the MTE tags are known to have be zeroed
so don't need to be swapped out. This moved clearing the tags together
with clearing the page and only requires managing the per-page flag
when creating a MTE mapping.

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rG FreeBSD src repository

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Buildable 74452
Build 71335: arc lint + arc unit

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andrew created this revision.Wed, Jul 1, 10:10 AM

Herald added a reviewer: manu. · View Herald TranscriptWed, Jul 1, 10:10 AM

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

andrew requested review of this revision.Wed, Jul 1, 10:10 AM

Harbormaster completed remote builds in B74452: Diff 181162.Wed, Jul 1, 10:10 AM

andrew added a child revision: D57991: linuxkpi: Move LINUXKPI_PROT_VALID higher.Wed, Jul 1, 10:10 AM

andrew mentioned this in D55956: arm64: Add PROT_MTE to mmap.Wed, Jul 1, 10:24 AM

Would inverting it to PV_MTE_DIRTY not make more sense, as then the default state (and pages that aren't even mapped with tags enabled) is 0?

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Path

Size

sys/

arm64/

mte.c

18 lines

pmap.c

67 lines

include/

pmap.h

2 lines

Diff 181162

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sys/arm64/arm64/mte.c

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sys/arm64/arm64/pmap.c

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amr64: Switch from PV_MTE_TAGGED to PV_MTE_CLEANNeeds ReviewPublicActions

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Diff 181162

sys/arm64/arm64/mte.c

sys/arm64/arm64/pmap.c

sys/arm64/include/pmap.h

amr64: Switch from PV_MTE_TAGGED to PV_MTE_CLEAN
Needs ReviewPublic
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Revision Contents
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