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

[Yinghai Lu]

On Fri, Dec 14, 2012 at 12:08 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> On Fri, Dec 14, 2012 at 12:04 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
>> On Fri, Dec 14, 2012 at 11:46 AM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>>>
>>> I suspect we don't need init_level4_pgt at all and should just plan to
>>> get rid of it.  Is there any reason we can't just build the proper
>>> kernel page table set in pagetable_init() and switch to it there?
>>
>> then how to pass the info to AP?
>
> also we should merge early_level4_pgt with init_level4_pgt.
>
> and #PE handler could just extend to use BRK ...
>
> but need to make sure BRK get mapped at first, and BRK could cross the
> 1G, 512G boundary ...
>
> that could make things less impact to all.

I tailored your patch and made use 2M page increase to replace patch
ioremap function.

   [PATCH v6 12/27] x86: use io_remap to access real_mode_data

and it will extend init_level4_pgt to map extra range. that will limit
affect to even others.

please check if that is ok to you.

Thanks

Yinghai

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