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From: Thomas Gleixner <tglx@linutronix.de>
To: Laura Nao <laura.nao@collabora.com>
Cc: kernel@collabora.com, laura.nao@collabora.com,
 linux-kernel@vger.kernel.org, regressions@leemhuis.info,
 regressions@lists.linux.dev, x86@kernel.org
Subject: Re: [REGRESSION] mainline boot regression on AMD Stoney Ridge
 Chromebooks
In-Reply-To: <87msq797pf.ffs@tglx>
References: <87ttkg7wvg.ffs@tglx>
 <20240405135837.306376-1-laura.nao@collabora.com> <87msq797pf.ffs@tglx>
Date: Mon, 08 Apr 2024 10:20:34 +0200
Message-ID: <87zfu46zal.ffs@tglx>
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Laura!

On Fri, Apr 05 2024 at 16:59, Thomas Gleixner wrote:
> On Fri, Apr 05 2024 at 15:58, Laura Nao wrote:
>> On 4/5/24 15:38, Thomas Gleixner wrote:
>>> 
>>> Can you please boot a working kernel and provide the output of:
>>> 
>>> # rdmsr 0xc0011005
>>
>> # rdmsr 0xc0011005
>> 2fabbfff2fd3fbff
>
> Ok. So the CPU does not advertise FEATURE_TOPOEXT which is consistent
> with CPUID.
>
> Now I'm even more puzzled because then the patch I gave you should make
> a difference. I need to run some errands now, I will provide a debug
> patch later this evening.

Hmm. No real good idea yet.

Can you please checkout

    c749ce393b8f ("x86/cpu: Use common topology code for AMD")

and apply the patch further up in the thread and see whether that
boots. We'll take it from there.

Thanks,

        tglx