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

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Message-ID: <5171CF86.30708@zytor.com>
Date:	Fri, 19 Apr 2013 16:13:10 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Bryan O'Donoghue" <bryan.odonoghue.lkml@...us-software.ie>
CC:	Borislav Petkov <bp@...en8.de>, 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 04/19/2013 02:44 PM, Bryan O'Donoghue wrote:
> On 19/04/13 22:25, Borislav Petkov wrote:
>> 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
> 
> More practical ? Hmm - the MSRs don't exist for < P5
> 
>> 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.void
> 
> You mean return !intel so this function will never be called.
> 
> __init load_ucode_bsp(void)
> {
>         int vendor = x86_vendor();
> 
>         if (vendor == X86_VENDOR_INTEL)
>                 load_ucode_intel_bsp();
> }
> 
> Ah yes. That would work and be less code.
> 
> We should do it that way.

Do you think you can have a patch for me in the next few hours?

	-hpa

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