linux-kernel - Re: x86/amd late microcode thread loading slows down boot

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Message-ID: <Zy0p5DT0SOWsCDn7@antipodes>
Date: Thu, 7 Nov 2024 21:58:12 +0100
From: Thomas De Schampheleire <thomas.de_schampheleire@...ia.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Andrew Cooper <andrew.cooper3@...rix.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: x86/amd late microcode thread loading slows down boot

On Thu, Nov 07, 2024 at 04:30:36PM +0100, Borislav Petkov wrote:
> 
> Thanks for saving me some wild goose chasing...
> 
> Thomas, do you want a diff to try?
> 

Thanks Andrew for the suggestion.

I tested with a call to 'flush_tlb_all()' right after native_rdmsr(), inside
__apply_microcode_amd(). This effectively fixes the problem.

Boris, perhaps you can propose a more fine-tuned flushing? I'd be happy to try
that.

Thanks,
Thomas