Re: UEFI support in ARM DomUs

[Julien Grall <julien@xen.org>]

On 01/06/2020 05:11, Roman Shaposhnik wrote:
> Hi Julien!

Hi Roman,

> 
> On Sun, May 31, 2020 at 3:24 PM Julien Grall <julien.grall.oss@gmail.com> wrote:
>>
>> On Sun, 31 May 2020 at 23:05, Roman Shaposhnik <roman@zededa.com> 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).

There used to be a page on the Linaro wiki when they did the port. But 
it looks like any Xen pages have been removed/relocated :(.

Anyway, a page on Xen Project wiki would definitely be appreciated.

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

Glad to hear that it worked :).

Cheers,

-- 
Julien Grall