linux-kernel - Re: [PATCH v3 0/9] Parallel CPU bringup for x86

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Date:   Fri, 22 Apr 2022 16:19:58 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Mimoja <mimoja@...oja.de>, Paul Menzel <pmenzel@...gen.mpg.de>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        rcu@...r.kernel.org, hewenliang4@...wei.com, hushiyuan@...wei.com,
        luolongjun@...wei.com, hejingxian@...wei.com
Subject: Re: [PATCH v3 0/9] Parallel CPU bringup for x86_64

On 4/21/22 05:00, Mimoja wrote:
> Dear Paul,
> 
>> Sorry for replying so late. I saw your v4 patches, and tried commit 
>> 5e3524d21d2a () from your branch `parallel-5.17-part1`. Unfortunately, 
>> the boot problem still persists on an AMD Ryzen 3 2200 g system, I 
>> tested with. Please tell, where I should report these results too (here 
>> or posted v4 patches).
> 
> We have confirmed the issue on multiple AMD CPUs from multiple 
> generations, leading to the guess that only Zen and Zen+ CPU seem affected 
> with Zen3 and Zen2 (only tested ulv) working fine. Tho we struggled to get 
> any output as the failing machines just go silent.
> 
> Not working:
> 
> Ryzen 5 Pro 2500u and 7 2700U
> Ryzen 3 2300G
> 
> while e.g.
> 
> Ryzen 7 Pro 4750U
> Ryzen 9 5950X
> 
> both work fine. We will continue to investigate the issue but are 
> currently a bit pulled into other topics.
> 
> Thomas, could please maybe help us identify which CPUs and MC-Versions are 
> worth looking at? David suggested you might have a good overview here.

Sorry, but not knowing what the actual reason for the boot problem, I 
really couldn't give you an idea as to which CPUs and/or MC versions are 
appropriate to look at.

Thanks,
Tom

> 
> 
> Best regards
> 
> Johanna "Mimoja"
>