Re: [PATCH] arm64: Filter out SME hwcaps when FEAT_SME isn't implemented

On Fri, 20 Jun 2025 12:28:48 +0100, Mark Brown wrote:

We have a number of hwcaps for various SME subfeatures enumerated via ID_AA64SMFR0_EL1. Currently we advertise these without cross checking against the main SME feature, advertised in ID_AA64PFR1_EL1.SME which means that if the two are out of sync userspace can see a confusing situation where SME subfeatures are advertised without the base SME hwcap. This can be readily triggered by using the arm64.nosme override which only masks out ID_AA64PFR1_EL1.SME, and there have also been reports of VMMs which do the same thing.

[...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: Filter out SME hwcaps when FEAT_SME isn't implemented https://git.kernel.org/arm64/c/a75ad2fc76a2

Cheers,