linux-kernel - Re: AMD zen microcode updates breaks boot

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Message-ID: <77f16324-47e1-41e6-a9e9-2cb7cbc8d14d@kernel.dk>
Date: Wed, 9 Oct 2024 05:04:23 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Borislav Petkov <bp@...en8.de>
Cc: Thomas Gleixner <tglx@...utronix.de>,
 the arch/x86 maintainers <x86@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>,
 "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: AMD zen microcode updates breaks boot

On 10/9/24 3:12 AM, Borislav Petkov wrote:
> On Mon, Sep 30, 2024 at 10:25:21AM -0600, Jens Axboe wrote:
>> Hmm, seems like a pretty standard cpu and updated microcode fw, no? But
>> if it's just me, we can just defer until it gets fixed, at least for
>> some more rcs. I just pruned the microcode for now to work around it, as
>> it's pretty annoying to forget about doing the reverts and then booting
>> a broken kernel. The box takes minutes to post+boot.
> 
> With the microcode blob removed so that no loading happens, what microcode
> does this box have?
> 
> Still 0x0aa00215?

Yep, 0xaa00215

-- 
Jens Axboe