linux-kernel - Re: [PATCH] x86: Add check for P5 to microcode_intel

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Message-ID: <20130419212514.GC3075@pd.tnic>
Date:	Fri, 19 Apr 2013 23:25:14 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Bryan O'Donoghue <bryan.odonoghue.lkml@...us-software.ie>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org, x86@...nel.org,
	fenghua.yu@...el.com
Subject: Re: [PATCH] x86: Add check for P5 to microcode_intel_early

On Fri, Apr 19, 2013 at 10:55:15PM +0200, Borislav Petkov wrote:
> Just filter out P5 and earlier. The code already does that for CPUs
> which don't have CPUID.

Actually, an alternative - more practical albeit not very accurate
solution would be to check for which families Intel delivers microcode
and do the cut off there with a comment as to why you do it like that.

I very much doubt, Intel will add microcode for *older* families to the
package :-).

IOW, in the linux intel-microcode package we currently have:

$ tree /lib/firmware/intel-ucode/
├── 06-0f-02
├── 06-0f-06
├── 06-0f-07
├── 06-0f-0a
├── 06-0f-0b
├── 06-0f-0d
├── 06-16-01
├── 06-17-06
├── 06-17-07
├── 06-17-0a
├── 06-1a-04
├── 06-1c-02
├── 06-1c-0a
├── 06-1d-01
├── 06-1e-04
├── 06-1e-05
├── 06-25-02
├── 06-25-05
├── 06-2a-07
├── 06-2d-06
├── 06-2d-07
├── 06-2f-02
├── 06-3a-09
├── 0f-04-01
├── 0f-04-03
├── 0f-04-04
├── 0f-04-07
├── 0f-04-08
├── 0f-04-09
├── 0f-04-0a
├── 0f-06-02
├── 0f-06-04
├── 0f-06-05
└── 0f-06-08

So < 6 should be fine.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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