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From: Thomas Gleixner <tglx@linutronix.de>
To: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@leemhuis.info>, Peter Schneider
 <pschneider1968@googlemail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
 stable@vger.kernel.org, regressions@lists.linux.dev
Subject: Re: Kernel 6.9 regression: X86: Bogus messages from topology detection
In-Reply-To: <1e26effd-a142-44f5-9a72-90a823666d7c@leemhuis.info>
References: <877cffcs7h.ffs@tglx>
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 <ce3abe01-4c37-416e-a5ed-25703318318a@googlemail.com>
 <87zfs78zxq.ffs@tglx>
 <76b1e0b9-26ae-4915-920d-9093f057796b@googlemail.com>
 <87r0dj8ls4.ffs@tglx> <87o78n8fe2.ffs@tglx> <87le3r8dyw.ffs@tglx>
 <bd7ff2f3-bf2c-4431-9848-8eb41e7422c6@googlemail.com>
 <87ikyu8jp4.ffs@tglx> <87frty8j9p.ffs@tglx>
 <1e26effd-a142-44f5-9a72-90a823666d7c@leemhuis.info>
Date: Sat, 01 Jun 2024 09:20:56 +0200
Message-ID: <87mso56sdj.ffs@tglx>
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On Sat, Jun 01 2024 at 09:06, Linux regression tracking (Thorsten Leemhuis)=
 wrote:
> On 31.05.24 10:42, Thomas Gleixner wrote:
>> On Fri, May 31 2024 at 10:33, Thomas Gleixner wrote:
>
>> ---
>> Subject: x86/topology/intel: Unlock CPUID before evaluating anything
>> From: Thomas Gleixner <tglx@linutronix.de>
>> Date: Thu, 30 May 2024 17:29:18 +0200
>>=20
>> Intel CPUs have a MSR bit to limit CPUID enumeration to leaf two. If this
>> bit is set by the BIOS then CPUID evaluation including topology enumerat=
ion
>> does not work correctly as the evaluation code does not try to analyze a=
ny
>> leaf greater than two.
>> [...]
>
> TWIMC, I noticed a bug report with a "12 =C3=97 12th Gen Intel=C2=AE Core=
=E2=84=A2
> i7-1255U" where the reporter also noticed a lot of messages like these:
>
> archlinux kernel: [Firmware Bug]: CPU4: Topology domain 1 shift 7 !=3D 6
> archlinux kernel: [Firmware Bug]: CPU4: Topology domain 2 shift 7 !=3D 6
> archlinux kernel: [Firmware Bug]: CPU4: Topology domain 3 shift 7 !=3D 6
>
> Asked the reporter to test this patch. For details see:
> https://bugzilla.kernel.org/show_bug.cgi?id=3D218879

Won't help. See: https://lore.kernel.org/all/87plt26m2b.ffs@tglx/

Thanks,

        tglx