Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early updateucode on Intel's CPU

[H. Peter Anvin]

On 12/11/2012 08:46 AM, Yinghai Lu wrote:
> On Tue, Dec 11, 2012 at 6:57 AM, Borislav Petkov <bp@xxxxxxxxx> wrote:
>> On Mon, Dec 10, 2012 at 11:07:38PM -0800, Yinghai Lu wrote:
>>> BTW, do we really need to update microcode so early?
>>
>> Yes we do. Normally ucode gets applied by the BIOS - this early approach
>> is for those cases where OEMs don't release new BIOS anymore but we
>> still need to apply a ucode patch as early as possible.
> 
> but old bios with old ucode still work with some kind of previous kernel?
> 
> Do we have case that system would not work with kernel if ucode is not
> updated so early?
> 

It's not about "not working"... it is about "if the microcode isn't
loaded early we have to disable features."

	-hpa


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