Restrict when we install arm64 spectre-v2 errata
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Authored by andrew on Sep 12 2023, 3:28 PM.

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Subscribers

emaste

imp

Details

Reviewers

manu

Group Reviewers

arm64

Summary

When an arm64 CPU implements the CSV2 feature we don't need to install
the branch prediction hardening handler. This is because training a
branch predictor in one hardware context can't control speculative
execution in another context.

Diff Detail

Repository

rG FreeBSD src repository

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Unit

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Build Status

Buildable 53549
Build 50440: arc lint + arc unit

Event Timeline

andrew created this revision.Sep 12 2023, 3:28 PM

Herald added a reviewer: manu. · View Herald TranscriptSep 12 2023, 3:28 PM

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

andrew requested review of this revision.Sep 12 2023, 3:28 PM

Harbormaster completed remote builds in B53549: Diff 127283.Sep 12 2023, 3:28 PM

andrew added a parent revision: D41829: Pass the arm64 midr when handling cpu errata.Sep 12 2023, 3:28 PM

andrew added a child revision: D41831: Skip known safe Spectre-V4 arm64 CPUs.

Does this start applying the workaround to older thunderx?

It will apply the fix if it has the SMCCC handler to workaround the issue implemented in firmware.

Revision Contents
Changeset List

Path

Size

sys/

arm64/

cpu_errata.c

46 lines

Diff 127283

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sys/arm64/arm64/cpu_errata.c

Restrict when we install arm64 spectre-v2 errataNeeds ReviewPublicActions