Re: [Xen-devel] [PATCH 05/18] efi: split efi_enabled to efi_platform and efi_loader

["Lennart Sorensen" <lsorense@xxxxxxxxxxxxxxxxxxx>]

On Fri, Mar 27, 2015 at 02:04:22PM +0000, Jan Beulich wrote:
> >>> On 27.03.15 at 14:53, <andrew.cooper3@xxxxxxxxxx> wrote:
> > On 27/03/15 13:43, Jan Beulich wrote:
> >>>>> On 27.03.15 at 14:32, <daniel.kiper@xxxxxxxxxx> wrote:
> >>> On Fri, Feb 20, 2015 at 04:17:35PM +0000, Jan Beulich wrote:
> >>>>>>> On 30.01.15 at 18:54, <daniel.kiper@xxxxxxxxxx> wrote:
> >>>>> We need more fine grained knowledge about EFI environment and check
> >>>>> for EFI platform and EFI loader separately to properly support
> >>>>> multiboot2 protocol.
> >>>> ... because of ... (i.e. I can't see from the description what the
> >>>> separation is good for). Looking at the comments you placed
> >>>> aside the variables doesn't help me either.
> >>>>
> >>>>> In general Xen loaded by this protocol uses
> >>>>> memory mappings and loaded modules in simliar way to Xen loaded
> >>>>> by multiboot (v1) protocol. Hence, split efi_enabled to efi_platform
> >>>>> and efi_loader.
> >>>> And if I'm guessing things right, then introducing efi_loader but
> >>>> leaving efi_enabled alone (only converting where needed) would
> >>> efi_enabled is not fortunate name for new usage. Currently it means
> >>> that Xen binary have or does not have EFI support build in. However,
> >>> if we build in multiboot2 protocol into xen.gz then it means that
> >>> it can ran on legacy BIOS or EFI platform. So, I think that we
> >>> should rename efi_enabled to efi_platform because it will mean
> >>> that Xen runs on EFI platform or not.
> >> I disagree here.
> >>
> >>> efi_loader is used to differentiate between EFI native loader
> >>> and multiboot2 protocol.
> >> And I agree here.
> > 
> > I suppose "built with efi support" is known because of CONFIG_EFI or 
> > not, and doesn't need a variable.
> > 
> > However, "booted legacy" vs "booted EFI" does need distinguishing at 
> > runtime, as either is possible.
> 
> Right, but that's what efi_enabled is supposed to express after
> the change; there's no need to express "built with EFI support".
> It just so happens that right now, without all these changes,
> built-with-EFI-support == runs-on-EFI.

Then how about 'efi_booted' as the variable name.

-- 
Len Sorensen

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