linux-kernel - Re: [tip: x86/urgent] x86/cpu/amd: Fix workaround for erratum 1054

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Message-ID: <20250418104013.GAaAIsDW2skB12L-nm@renoirsky.local>
Date: Fri, 18 Apr 2025 12:40:13 +0200
From: Borislav Petkov <bp@...en8.de>
To: linux-kernel@...r.kernel.org
Cc: linux-tip-commits@...r.kernel.org, Sandipan Das <sandipan.das@....com>,
	Ingo Molnar <mingo@...nel.org>, x86@...nel.org
Subject: Re: [tip: x86/urgent] x86/cpu/amd: Fix workaround for erratum 1054

On Fri, Apr 18, 2025 at 06:36:19AM -0000, tip-bot2 for Sandipan Das wrote:
> The following commit has been merged into the x86/urgent branch of tip:
> 
> Commit-ID:     f4efdb357680bef4584faedbd44b90cd53d3245f
> Gitweb:        https://git.kernel.org/tip/f4efdb357680bef4584faedbd44b90cd53d3245f
> Author:        Sandipan Das <sandipan.das@....com>
> AuthorDate:    Fri, 18 Apr 2025 11:49:40 +05:30
> Committer:     Ingo Molnar <mingo@...nel.org>
> CommitterDate: Fri, 18 Apr 2025 08:31:07 +02:00
> 
> x86/cpu/amd: Fix workaround for erratum 1054
> 
> Erratum 1054 affects AMD Zen processors that are a part of Family 17h
> Models 00-2Fh and the workaround is to not set HWCR[IRPerfEn]. However,
> when X86_FEATURE_ZEN1 was introduced, the condition to detect unaffected
> processors was incorrectly changed in a way that the IRPerfEn bit gets
> set only for unaffected Zen 1 processors.

Whoops, sorry about that.

> Fixes: 232afb557835 ("x86/CPU/AMD: Add X86_FEATURE_ZEN1")
> Signed-off-by: Sandipan Das <sandipan.das@....com>
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> Link: https://lore.kernel.org/r/caa057a9d6f8ad579e2f1abaa71efbd5bd4eaf6d.1744956467.git.sandipan.das@amd.com

This needs

Cc: <stable@...nel.org>

Thx.