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

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Message-ID: <20241009091247.GCZwZJDwFETmN5pEGe@fat_crate.local>
Date: Wed, 9 Oct 2024 11:12:47 +0200
From: Borislav Petkov <bp@...en8.de>
To: Jens Axboe <axboe@...nel.dk>
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 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?

I.e., what does:

$ grep microcode /proc/cpuinfo | sort | uniq -c

say?

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette