For the 1:1 map we probably should make all pages executable; other things need it too, but we shouldn't have it mapped in except when needed.

"huang ying" <huang.ying.caritas@gmail.com> wrote:

quoted text
>On Mon, Aug 16, 2010 at 11:27 AM, H. Peter Anvin <hpa@zytor.com> wrote:
>> No, it should not be dynamic; rather we should unify all the users who need a 1:1 map and just keep that page table set around.
>
>Agree. One known issue of global 1:1 map is that we need to make at
>least part of page table PAGE_KERNEL_EXEC for EFI runtime code, and
>change_page_attr can not be used before page allocator is available.
>
>Best Regards,
>Huang Ying

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