[PATCH v2 00/11] arm64: Fully disable configured-out features

[Fuad Tabba]

Hi Marc,

On Mon, 2 Mar 2026 at 11:57, Marc Zyngier <maz at kernel.org> wrote:
>
> This is v2 of this series attempting at making the handling of
> features that are disabled at compile time a bit less awkward for
> non-userspace consumers of the sanitised feature bits.
>
> A few things have changed, thanks to Fuad and Suzuki spending time on
> reviewing this, but the overall behaviour is the same.
>
> * From v1 [1]:
>
>   - Mark ALL_HIDDEN and HIGHER_SAFE as incompatible
>
>   - Don't update a feature that is ALL_HIDDEN (or overridden) on the
>     secondary boot path
>
>   - Reduce the size of struct arm64_ftr_bits
>
>   - Add a helper for setting a field to its safe value
>
> [1] https://lore.kernel.org/r/20260219195533.2455736-1-maz@kernel.org

For the series:
Reviewed-by: Fuad Tabba <tabba at google.com>
Tested-by: Fuad Tabba <tabba at google.com>

Cheers,
/fuad





>
> Marc Zyngier (11):
>   arm64: Skip update of an idreg field affected by an override
>   arm64: Add a helper setting a feature field to its safe value
>   arm64: Add logic to fully remove features from sanitised id registers
>   arm64: Convert CONFIG_ARM64_PTR_AUTH to FTR_CONFIG()
>   arm64: Convert CONFIG_ARM64_SVE to FTR_CONFIG()
>   arm64: Convert CONFIG_ARM64_SME to FTR_CONFIG()
>   arm64: Convert CONFIG_ARM64_GCS to FTR_CONFIG()
>   arm64: Convert CONFIG_ARM64_MTE to FTR_CONFIG()
>   arm64: Convert CONFIG_ARM64_POE to FTR_CONFIG()
>   arm64: Convert CONFIG_ARM64_BTI to FTR_CONFIG()
>   arm64: Remove FTR_VISIBLE_IF_IS_ENABLED()
>
>  arch/arm64/include/asm/cpufeature.h |  15 +--
>  arch/arm64/kernel/cpufeature.c      | 141 +++++++++++++++++-----------
>  2 files changed, 94 insertions(+), 62 deletions(-)
>
> --
> 2.47.3
>