RE: UEFI support in ARM DomUs

[Peng Fan <peng.fan@xxxxxxx>]

Grall <julien@xxxxxxx>;
> Nataliya Korovkina <malus.brandywine@xxxxxxxxx>
> Subject: UEFI support in ARM DomUs

We have made U-Boot run inside XEN DomU, but just only PV console part,
not implement other frontend drivers currently. Would this help for your
case if enable EFI in U-Boot?

Regards,
Peng.

> 
> Hi!
> 
> with a lot of help from Stefano, we're getting RPi4 support in Project EVE
> pretty much on par between KVM and Xen.
> 
> One big area that still remains is supporting UEFI boot sequence for DomUs.
> With KVM, given the qemu virt device model this is as simple as using either
> stock UEFI build for arm or even U-Boot EFI emulation environment and
> passing it via -bios option.
> 
> Obviously with Xen on ARM we don't have the device model so my
> understanding is that the easiest way we can support it would be to port
> UEFI's OvmfPkg/OvmfXen target to ARM (it seems to be currently exclusively
> X64).
> 
> So here's my first question: if there's anybody on this list who had a hand in
> implementing OvmfPkg/OvmfXen can you please share your thoughts on how
> much work that port may be (or whether it is even feasible -- I may totally be
> missing something really obvious here).
> 
> And as long as I've got your attention: two more questions:
>    1.. compared to the above, would porting pvgrub to ARM be any
>    easier or more difficult?
> 
>    2. same question for teaching u-boot about PV calls.
> 
> Thanks,
> Roman.
> 
> P.S. Oh and I guess between:
>    0. OvmfPkg/OvmfXen on ARM64
>    1. pvgrub on ARM64
>    2. u-boot/EFI emulation with PV calls backend I didn't miss any other
> obvious way of making UEFI-aware VM images to boot on Xen ARM64 DomU,
> right?