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Re: [Xen-devel] 4.3 Planning: Taking stock

On 23/01/13 17:00, Jan Beulich wrote:
On 23.01.13 at 17:52, George Dunlap <George.Dunlap@xxxxxxxxxxxxx> wrote:
* Xen EFI feature: dom0 able to make use of EFI run-time services

Daniel Kiper is already working on this, but has just started.  The issue
(as I understand it) is that if there are systems where the ACPI tables are
only discoverable via EFI, then Xen+pvops will not be able to boot if pvops
doesn't have EFI run-time support.  The following version of Xen won't come
out until probably Q2 2014, and won't hit distros probably until 6 months
after that.

Given that, what do we think is the likelihood of such systems cropping up
in that timeframe?  If the answer is anything other than "very low", I
think that as a strategic measure, this one is probably important enough to
slip the schedule a little bit if necessary.
Except that this ought to be marked (external) in the first place:
The hypervisor support is all there (otherwise our kernels wouldn't
have been successfully booting on EFI for well over a year), and
hence this work shouldn't really have any impact on the schedule.

Ah, right -- sorry, I misunderstood the situation. As long as the Xen side is there to use as soon as the functionality is ready, I think we're probably fine.

The one feature here that requires work in our tree is to be able
to boot via grub.efi (irrespective of how little I personally like that);
I'm not sure Daniel was also planning to look into that part.

Do you think not having this for 4.3 will be a potential problem for Xen?


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