Re: [PATCH -v2 0/4] EFI 1:1 mapping

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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?

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--
--
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




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux