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Date:	Wed, 19 Dec 2012 16:02:25 -0800
From:	"H. Peter Anvin" <>
To:	Borislav Petkov <>, Jacob Shin <>,
	Yinghai Lu <>,
	"H. Peter Anvin" <>,
	"Yu, Fenghua" <>,
	"" <>,
	"" <>,
	"" <>,
	Konrad Rzeszutek Wilk <>,
	Stefano Stabellini <>
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.


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

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