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

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Date:   Thu, 21 Apr 2022 12:00:40 +0200
From:   Mimoja <mimoja@...oja.de>
To:     Paul Menzel <pmenzel@...gen.mpg.de>,
        David Woodhouse <dwmw2@...radead.org>, thomas.lendacky@....com,
        mimoja@...oja.de
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

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.

Best regards

Johanna "Mimoja"