Re: [PATCH] efi: add efi_runtime state checking

[H. Peter Anvin]

On 06/28/2012 10:02 AM, Olof Johansson wrote:
> 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.

Ping?

	-hpa


--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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