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From: Thomas Gleixner <tglx@linutronix.de>
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To: 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: <87r0dj8ls4.ffs@tglx>
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>
Date: Thu, 30 May 2024 17:53:57 +0200
Message-ID: <87o78n8fe2.ffs@tglx>
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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