arm64: Add override for WFxT

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Add an override for WFxT support within ID_AA64ISAR2_EL1 to allow
it to be disabled using the new arm64.nowfxt command line parameter.

This accompanies the idle=nop param introduced in a previous patch
series [1] in dealing with misbehaving WFI and WFIT instructions on
Apple Silicon SoCs, and eases debugging of other quirky WFxT
implementations.

Link[1]: https://lore.kernel.org/all/20260804-arm64-idle-param-v3-1-d10f8159062b@cyberchaos.dev/
Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Yureka Lilian <yureka@cyberchaos.dev>
Signed-off-by: Will Deacon <will@kernel.org>

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Yureka Lilian 2026-09-11 19:02:10 +02:00 • committed by Will Deacon

parent bb756b11ad

commit baaa9b126b

2 changed files with 5 additions and 0 deletions

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3

Documentation/admin-guide/kernel-parameters.txt

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2

arch/arm64/kernel/pi/idreg-override.c

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