linux-kernel - Re: [REGRESSION] mainline boot regression on AMD Stoney Ridge Chromebooks

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Date: Mon, 08 Apr 2024 10:20:34 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Laura Nao <laura.nao@...labora.com>
Cc: kernel@...labora.com, laura.nao@...labora.com,
 linux-kernel@...r.kernel.org, regressions@...mhuis.info,
 regressions@...ts.linux.dev, x86@...nel.org
Subject: Re: [REGRESSION] mainline boot regression on AMD Stoney Ridge
 Chromebooks

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