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

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Date:	Fri, 22 Jun 2012 22:54:58 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Borislav Petkov <bp@...64.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>, X86-ML <x86@...nel.org>,
	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 Fri, 22 Jun 2012, H. Peter Anvin wrote:
> On 06/20/2012 04:09 AM, Borislav Petkov wrote:
> > Yeah, both should be workable. Let's see what Intel wants to do: hpa,
> > Fenghua?
> 
> What we want to do is to have a unified binary blob (which would be
> about half that size) but the format may be affected by Fenghua's
> ongoing work so we're not quite ready to rev the format now just to do
> it again.

Any reason why you can't just take a single file with one binary microcode
appended back-to-back after the other (i.e. exactly what /dev/cpu/microcode
accepts)?

You'd only be able to release that memory after all cores were brought
online [and any microcode that did get used to update a core was copied
somewhere else for future use], but that's hardly a big problem.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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