Re: [Xen-devel] [PATCH V2 for-4.5] EFI: Always use EFI command line

[Roy Franz <roy.franz@xxxxxxxxxx>]

On Mon, Oct 27, 2014 at 3:55 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 25.10.14 at 21:18, <roy.franz@xxxxxxxxxx> wrote:
>> Jan - do you know how this command line handling in GRUB for x86 is
>> handled?  I would think that x86
>> would have the same issue with the command line.
>
> I guess the question isn't really relevant on x86 since we don't try to
> boot the same image two ways.

I think this is related to wanting to be able to boot both and EFI executable
and a Linux Image using GRUB.  Whether these are the same file or not
doesn't affect how the command lines are different.

>
> And anyway, only when booting from UEFI (without GrUB involved)
> does anything prior to an eventual -- matter. With GrUB it shouldn't
> (and hence the separator is then also pointless and should neither
> get inserted nor looked for), as these options only control the EFI
> application behavior of the binary. At least that's how it was
> intended to be originally.
>
> Jan
>
So I guess on x86 GRUB is not used to boot the EFI version of Xen?  My
understanding
is that for arm64 servers all the distros want to use GRUB to boot, as
that is primarily how
things work now, even though UEFI provides boot menu support directly.
So for arm64 we want
to support booting EFI both directly and using GRUB.  While there is
no need now to control the
behavior of the EFI application portion of Xen when booting via GRUB I
think this would be useful to
support.

Roy

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