linux-kernel - Re: [PATCH 2/2] x86, microcode: Make reload interface per system

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Date:	Wed, 20 Jun 2012 12:19:43 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Borislav Petkov <bp@...64.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>, X86-ML <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [PATCH 2/2] x86, microcode: Make reload interface per system

On Wed, Jun 20, 2012 at 12:08:51PM +0200, Peter Zijlstra wrote:
> On Wed, 2012-06-20 at 11:56 +0200, Borislav Petkov wrote:
> >         sprintf(name, "intel-ucode/%02x-%02x-%02x",
> >                 c->x86, c->x86_model, c->x86_mask);
> > 
> > 
> 
> but but but, the ucode image actually contains stuff for multiple
> things.. so I have to like rename it to match the actual cpu in the
> machine?
> 
> That seems rather daft..
> 
> awk 'BEGIN { FS=":" } /family/ {fam=$2} /model[^ ]/ {mod=$2} /stepping/
> {step=$2} END { printf "intel-ucode/%02x-%02x-%02x\n", fam, mod,
> step }' /proc/cpuinfo
> 
> Will get me the right filename, but surely that's not user-friendly at
> all...

I know, right. Whose idea was it to do it like that I don't know.
AFAICT, Intel delivers ucode as a single blob too, so why split it? The
driver picks out the right blob anyway.

But there was a script somewhere which did that automatically. Henrique
will know more about how this is handled.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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