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Message-ID: <e3ef8236-344d-e840-575c-a5fb1450a13b@mimoja.de>
Date:   Thu, 21 Apr 2022 12:00:40 +0200
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Subject: Re: [PATCH v3 0/9] Parallel CPU bringup for x86_64
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To:     Paul Menzel <pmenzel@molgen.mpg.de>,
        David Woodhouse <dwmw2@infradead.org>, thomas.lendacky@amd.com,
        mimoja@mimoja.de
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H . Peter Anvin" <hpa@zytor.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        rcu@vger.kernel.org, hewenliang4@huawei.com, hushiyuan@huawei.com,
        luolongjun@huawei.com, hejingxian@huawei.com
References: <20211215145633.5238-1-dwmw2@infradead.org>
 <9a47b5ec-f2d1-94d9-3a48-9b326c88cfcb@molgen.mpg.de>
 <ab28d2ce-4a9c-387d-9eda-558045a0c35b@molgen.mpg.de>
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 <ea433e41-0038-554d-3348-70aa98aff9e1@molgen.mpg.de>
 <efbe0d3d92e6c279e3a6d7a4191ca7470bc4beec.camel@infradead.org>
 <74d2302f-88fc-c75c-6d2d-4aece1a515bb@molgen.mpg.de>
From:   Mimoja <mimoja@mimoja.de>
In-Reply-To: <74d2302f-88fc-c75c-6d2d-4aece1a515bb@molgen.mpg.de>
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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"