Re: [PATCH] efi: add efi_runtime state checking

[Olof Johansson]

On Wed, Jun 27, 2012 at 2:52 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> On 06/27/2012 02:35 PM, Olof Johansson wrote:
>>
>> This adds an efi_runtime variable indicating whether the
>> efi runtime services are available. The only time they are
>> expected to not be available is when a 32-bit kernel has been
>> booted using 64-but EFI and vice versa.
>>
>> It also adds checking to the two locations where functions are
>> called; x86 reboot and efivars.
>>
>
> OK, stupid question:
>
> Why is this different from the efi_enabled variable, or rather: why is it
> different from what the efi_enabled variable *should* be?  If runtime
> services aren't available the only "EFI" that is available to the kernel are
> the data structures passed in, and those can be checked directly...

Excellent question, and I think it would work to turn off efi_enabled
towards the end of setup_arch() for non-native boots. That'd solve all
these problems, I believe.

I'll try it out and revise this patch. It might take me a day or two
to get cycles for it.


-Olof
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