linux-kernel - Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU

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Message-ID: <50D25591.4030302@zytor.com>
Date:	Wed, 19 Dec 2012 16:02:25 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>, Jacob Shin <jacob.shin@....com>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU

On 12/19/2012 03:40 PM, Borislav Petkov wrote:
>
> This is done on the BSP, right? So we can measure it how long it takes
> by taking TSC values of start and end.
>

Yes, and we can count the number of #PF traps cheaply enough.  It would 
be interesting to put a counter on the number of #PFs and the number of 
resets and read them out on a large-system boot.

>
> Sounds doable but we should take a hard look at the patches so that we
> don't miss anything.
>
> Also, I don't know how stuff like that would be approached for a wider
> testing - I mean, it is a serious change in x86 boot code and there will
> be issues.
>

The goal should be to have this into -tip and -next by the middle of 
January in order to make the 3.9 merge window, I think.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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