[Xen-devel] [Hackathon minutes] Xen and UEFI support

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Hi all,
these are my notes on Xen on UEFI taken at the Hackathon.

---

At the moment Grub2 on UEFI calls ExitBootServices and put all the boot
time information on a multiboot2 structure. However Xen does not support
multiboot2 so it cannot parse them.

We need to add multiboo2 support to Xen (x86 and ARM).

We might want to support Xen being loaded as a Portable Executable by
Gummiboot. It shouldn't be very different from the current way of
supporting Xen being booted as a PE by the UEFI loader, the only
difference is that Xen is going to get the location of the kernel and
initrd from the command line rather than a config file.

We need to support this case on ARM too, however the Portable
Executable build target is currently x86 specific (funny, isn't it?).

We might have to support RuntimeServices at least in dom0 at the very
least to allow the user to read/write the UEFI variables.
Do we need to add a set of hypercalls for dom0 to use or can we trap and
emulate the calls in Xen?

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