Re: [PATCH 0/2] xen/efi: Make boot more flexible, especially with GRUB2

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On Tue, Jun 24, 2025 at 09:38:42AM +0100, Frediano Ziglio wrote:
> On Tue, Jun 24, 2025 at 9:32 AM Frediano Ziglio
> <frediano.ziglio@xxxxxxxxx> wrote:
> >
> > The combination of GRUB2, EFI and UKI allows potentially more flexibility.
> > For instance is possible to load xen.efi from a no ESP partition leaving
> > a boot loader like GRUB2 taking care of the file loading.
> > This however requires some changes in Xen to be less restrictive.
> > Specifically for GRUB2 these changes allows the usage of "chainloader"
> > command with UKI and reading xen.efi from no ESP (so no DeviceHandle
> > set) and usage of "linux" and "initrd" commands to load separately
> > the kernel (embedding using UKI) and initrd (using LoadFile2 protocol).
> 
> I was forgetting. If somebody wants to test "linux" and "initrd"
> command with these changes be aware that GRUB currently has a problem
> passing arguments, I posted a patch, see
> https://lists.gnu.org/archive/html/grub-devel/2025-06/msg00156.html.
> I also have a workaround for this issue in xen but it would be better
> to have a fix in GRUB.

Can you tell more how to test this, especially the second variant? When
trying to use GRUB linux or linuxefi commands on xen.efi, I get "invalid
magic number" error.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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