linux-kernel - Re: [PATCH 04/11] x86/microcode_core_early.c: Define interfaces for early load ucode

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Message-ID: <20120820201947.GC15006@aftab.osrc.amd.com>
Date:	Mon, 20 Aug 2012 22:19:47 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH 04/11] x86/microcode_core_early.c: Define interfaces for
 early load ucode

On Mon, Aug 20, 2012 at 01:08:49PM -0700, H. Peter Anvin wrote:
> On 08/20/2012 07:06 AM, Borislav Petkov wrote:
> > 
> > Or,
> > 
> > in case we want to supply more vendor-specific stuff early at boot, we
> > could do:
> > 
> > kernel/x86/<vendor>/microcode...
> > 		|-> bios_overrides
> > 		|-> ...
> > 
> > and have this layout extensible from the beginning...
> > 
> Does that make sense, though?

Only time will tell. I was simply saying that we should leave ourselves
the door opened, should we need functionality like that in the future.

> I'm a bit concerned about having multiple files named microcode.bin by
> default; the pathname isn't as sticky as the filename when people move
> things around...

Ok, I see.

How about the following scheme then:

kernel/x86/<vendor>-microcode.bin
kernel/x86/<vendor>-bios-overrides.blob
...

?

All I'm saying is maybe we should impose some sanity rules now before
people go crazy with this and things get out of hands...

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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