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

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Message-ID: <ZxKQux4I8We0Ax3-@gallifrey>
Date: Fri, 18 Oct 2024 16:45:47 +0000
From: "Dr. David Alan Gilbert" <linux@...blig.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Jens Axboe <axboe@...nel.dk>, 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

* Borislav Petkov (bp@...en8.de) wrote:
> On Fri, Oct 18, 2024 at 07:30:15AM -0600, Jens Axboe wrote:
> > At least on mine, the BIOS has an option that says something like "L3
> > cache as numa domain", which is on and why there's 32 nodes on that box.
> > It's pretty handy for testing since there's a crap ton of CPUs, as it
> > makes affinity handling easier.
> 
> Right, so two boxes I tested with this:
> 
> * 2 socket, a bit different microcode:
> 
> [   22.947525] smp: Brought up 32 nodes, 512 CPUs
> 
> * your CPU, one socket:
> 
> [   26.830137] smp: Brought up 16 nodes, 255 CPUs

(Probably unrelated but...)
What happened to number 256 ?

Dave

> [   37.770789] microcode: Current revision: 0x0aa00215
> [   37.776231] microcode: Updated early from: 0x0aa00215
> 
> and both boot with my debugging patch just fine.
> 
> Hmm.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette
> 
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
\        dave @ treblig.org |                               | In Hex /
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