Re: UEFI support in ARM DomUs

[Roman Shaposhnik <roman@xxxxxxxxxx>]

Hi Julien!

On Sun, May 31, 2020 at 3:24 PM Julien Grall <julien.grall.oss@xxxxxxxxx> wrote:
>
> On Sun, 31 May 2020 at 23:05, Roman Shaposhnik <roman@xxxxxxxxxx> wrote:
> > 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).
>
> EDK2 has been supporting Xen on Arm for the past 5 years. We don't use
> OvmfPkg/OvmfXen but ArmVirtPkg/ArmVirtXen (see [1]).
> I haven't tried to build it recently, but I should be able to help if
> there is any issue with it.
>
> Cheers,
>
> [1] https://github.com/tianocore/edk2/blob/master/ArmVirtPkg/ArmVirtXen.fdf

This is really, really awesome -- I guess it would be really helpful to document
this someplace on the ARM/Xen wiki (I can volunteer if someone can grant
me the karma).

I've built XEN_EFI.fd and the rest worked out like a charm.

All on Raspberry Pi 4!

Thanks,
Roman.