linux-kernel - Re: Kernel 6.9 regression: X86: Bogus messages from topology detection

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Date: Thu, 30 May 2024 17:53:57 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Peter Schneider <pschneider1968@...glemail.com>
Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
 stable@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: Kernel 6.9 regression: X86: Bogus messages from topology detection

On Thu, May 30 2024 at 15:35, Thomas Gleixner wrote:
> On Thu, May 30 2024 at 12:06, Peter Schneider wrote:
> Now the million-dollar question is what unlocks CPUID to read the proper
> value of EAX of leaf 0. All I could come up with is to sprinkle a dozen
> of printks into that code. Updated debug patch below.

Don't bother. Dave pointed out to me that this is unlocked in
early_init_intel() via MSR_IA32_MISC_ENABLE_LIMIT_CPUID...

Let me figure out how to fix that sanely.

Thanks,

        tglx