[PATCH][EFI] Run EFI in physical mode
H. Peter Anvin
hpa at zytor.com
Mon Aug 16 01:08:43 EDT 2010
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 at gmail.com> wrote:
>On Mon, Aug 16, 2010 at 11:27 AM, H. Peter Anvin <hpa at 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.
Sent from my mobile phone. Please pardon any lack of formatting.
More information about the kexec