Re: PvGRUB2 on Arm64?

["Benjamin Mordaunt" <crawford.benjamin15@xxxxxxxxx>]

On Fri Oct 7, 2022 at 4:53 PM BST, Julien Grall wrote:
> Hi Benjamin,
>
> On 07/10/2022 16:38, Benjamin Mordaunt wrote:
> > On 07/10/2022 11:42, Julien Grall wrote:
> > 
> >> We have support for UEFI/U-boot in the guest. With that you should be
> > 
> >   > able to launch a normal GRUB. Would that work for you?
> > 
> > I’m struggling to interpret Xen’s documentation around EFI Guest support on 
> > arm64.
> > 
> > You claim that it exists, and sure enough I can find resources for EFI Xen 
> > Host,
> > but in
> > 
> > terms of DomU, I see OVMF for x86, but don’t see anything for Arm.
> > 
> > Can you give any pointers?
>
> The EDK2 platform is ArmVirtPkg/ArmVirtXen.dsc. Unfortunately, I don't 
> have the instructions at hand.
>
> To build the EFI firmware, you should be able to use instructions in [1] 
> and then use "Xen" rather than QEMU. The blob provided could be used by 
> replacing adding as the kernel in the xl configuration file.
>
> Note that I haven't used EDK2 recently. So I can't guarantee this work. 
> Although, I should be able to help if there are any issues.
>
> Cheers,
>
> [1] https://www.kraxel.org/blog/2022/05/edk2-virt-quickstart/
>
> -- 
> Julien Grall

Hi Julien, apologies I haven't expressed my requirements properly. I
have a system which boots via U-Boot (in theory, it could boot through
EFI, but that would involve changing a lot of configuration).

What I really wanted was the following flow:

U-Boot -> Xen -> EFI (for guest) -> GRUB -> Ubuntu

Is this possible, or do we need to use EFI at the top level?

--
Ben