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

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Date: Mon,  8 Apr 2024 13:06:05 +0200
From: Laura Nao <laura.nao@...labora.com>
To: tglx@...utronix.de
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

Hi Thomas,

On 4/8/24 10:20, Thomas Gleixner wrote:
> 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.
> 

Just tried that and it doesn't boot, nothing on the serial console (I
kept earlyprintk=ttyS0,115200 in the cmdline).

Test job for reference: https://lava.collabora.dev/scheduler/job/13297561

Thanks,

Laura