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

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Message-ID: <aAJIdUAHfwo8d7WS@gmail.com>
Date: Fri, 18 Apr 2025 14:41:25 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Greg KH <gregkh@...uxfoundation.org>, stable <stable@...r.kernel.org>,
	linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
	Sandipan Das <sandipan.das@....com>, x86@...nel.org
Subject: Re: [tip: x86/urgent] x86/cpu/amd: Fix workaround for erratum 1054


* Borislav Petkov <bp@...en8.de> wrote:

> > plus the erratum is a perf-counters information quality bug 
> > affecting what appears to be a limited number of models, with the 
> > workaround
> 
> No, the fix is needed because Zen2 and newer won't set 
> MSR_K7_HWCR_IRPERF_EN_BIT. It needs to go everywhere.

Fair enough - the current version already has Cc: stable:

  263e55949d89 x86/cpu/amd: Fix workaround for erratum 1054

  ...

  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>
  Acked-by: Borislav Petkov <bp@...en8.de>
  Cc: stable@...r.kernel.org
  Link: https://lore.kernel.org/r/caa057a9d6f8ad579e2f1abaa71efbd5bd4eaf6d.1744956467.git.sandipan.das@amd.com

Thanks,

	Ingo