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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