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Differential D53112

arm64: Move BP hardening and SSBD workaround to CPU_FEAT framework
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Authored by sarah.walker2_arm.com on Oct 15 2025, 12:35 PM.

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Reviewers

andrew
manu

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Commits

rG78e35c352f2e: arm64: Move BP hardening and SSBD workaround to CPU_FEAT framework
rGd970d0246fdd: arm64: Move BP hardening and SSBD workaround to CPU_FEAT framework

Summary

Port the BP hardening and SSBD workaround from cpu_quirks to the
CPU_FEAT framework.

Sponsored by: Arm Ltd

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Repository

rG FreeBSD src repository

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Build Status

Buildable 67823
Build 64706: arc lint + arc unit

Event Timeline

sarah.walker2_arm.com created this revision.Oct 15 2025, 12:35 PM

Herald added a reviewer: andrew. · View Herald TranscriptOct 15 2025, 12:35 PM

Herald added a reviewer: andrew. · View Herald Transcript

Herald added a reviewer: manu. · View Herald Transcript

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

sarah.walker2_arm.com requested review of this revision.Oct 15 2025, 12:35 PM

Harbormaster completed remote builds in B67798: Diff 164217.Oct 15 2025, 12:35 PM

The best names I can come up with for a workaround for a missing feature is feat_foo_missing or feat_foo_workaround

sys/arm64/arm64/spec_workaround.c
6	Extra line
33	Missing line
113	I'd like to keep `feat_*` for architectural features. The closest feature is `FEAT_CSV2`, however this tells us when the workaround is not needed, so maybe we could come up with something based on that. The name is used in the `hw.feat` sysctls & can be used to enable/disable features/workarounds on boot.
165	The appropriate feature here is `FEAT_SSBS`

Address review comments

Harbormaster completed remote builds in B67823: Diff 164290.Oct 16 2025, 2:22 PM

andrew accepted this revision.Oct 16 2025, 2:52 PM

This revision is now accepted and ready to land.Oct 16 2025, 2:52 PM

Closed by commit rGd970d0246fdd: arm64: Move BP hardening and SSBD workaround to CPU_FEAT framework (authored by sarah.walker2_arm.com, committed by andrew). · Explain WhyOct 16 2025, 4:14 PM

This revision was automatically updated to reflect the committed changes.

andrew added a commit: rGd970d0246fdd: arm64: Move BP hardening and SSBD workaround to CPU_FEAT framework.

andrew added a commit: rG78e35c352f2e: arm64: Move BP hardening and SSBD workaround to CPU_FEAT framework.Jan 14 2026, 12:56 AM

Revision Contents
Changeset List

Path

Size

sys/

arm64/

arm64/

96 lines

spec_workaround.c

166 lines

conf/

1 line

Diff 164290

sys/arm64/arm64/cpu_errata.c

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sys/arm64/arm64/spec_workaround.c

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sys/conf/files.arm64

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