Re: [PATCH v6 01/18] x86/cpufeatures: Support Privilege Level Zero Association (PLZA)

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] x86/cpufeatures: missing tools header synchronization for X86_FEATURE_PLZA
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commit 4774876a98b5fdbef10f6f59346ad4e8b9b8b7ac
Author: Babu Moger <babu.moger@amd.com>

x86/cpufeatures: Support Privilege Level Zero Association (PLZA)

This commit adds support for the Privilege Level Zero Association (PLZA)
feature on AMD processors. It updates the cpufeatures header and the
scattered CPUID bits to detect and expose PLZA.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 # [2]

> diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> index f70ee74b5f921..a5599455ce158 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -529,6 +529,7 @@
>  						      * and purposes if CLEAR_CPU_BUF_VM is set).
>  						      */
>  #define X86_FEATURE_X2AVIC_EXT		(21*32+20) /* AMD SVM x2AVIC support for 4k vCPUs */
> +#define X86_FEATURE_PLZA		(21*32+21) /* Privilege Level Zero Association */

[Severity: Low]
Does this change also need to be synchronized to the tools directory?

The tools/perf build process runs check-headers.sh, which strictly checks
for synchronization between arch/x86/include/asm/cpufeatures.h and its
copy in tools/arch/x86/include/asm/cpufeatures.h.

Failing to synchronize the tools copy will result in a "Kernel ABI header
differs" build warning when compiling perf from this commit or anywhere
later in the series.

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Sashiko AI review · https://sashiko.dev/#/patchset/cover.1790867441.git.babu.moger@amd.com?part=1