On Wed, 19 Jun, at 06:59:02PM, Borislav Petkov wrote: > On Wed, Jun 19, 2013 at 05:48:22PM +0100, Matthew Garrett wrote: > > > Ok, so it sounds like we want to *always* create both mappings but, > > > depending on what we want, to shove down SetVirtualAddressMap a > > > different set. And the 1:1 map will be the optional one which we give > > > SetVirtualAddressMap only when user wants it, i.e. when booting with > > > "efi=1:1_map". > > > > Yup, I think that sounds ideal. > > Crap, I got completely sidetracked. The 1:1 mappings go in a different > pagetable (real_mode_header->trampoline_pgd) than the kernel one > (i.e. init_mm.pgd). However, the ->trampoline_pgd has all mappings > anyway, which means that if we want to do EFI runtime calls with the > high mappings but *also* have the 1:1 mappings established, we should > *always* switch to that pagetable when doing those calls. > > hpa, MattF, agreed? Yep. -- Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
