Re: [Xen-devel] Xen 4.3 development update, and stock-taking

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.01.13 at 15:32, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> On 17/01/13 14:15, Jan Beulich wrote:
>>> Just to be clear here: are you saying that there is no way to boot 
>>> Xen directly from EFI with a pvops kernel? if so, that seems like a 
>>> pretty big deal to me... 
>> It depends on the system: Those ones where legacy methods still
>> allow finding namely ACPI tables would allow booting. On ones
>> where those tables can be found only by consulting EFI, booting
>> is possible, but you'd generally end up without PCI interrupts
>> (which to me is almost the same as "doesn't boot").
> 
> OK; so we're talking about different things.  I'm talking about 1) can 
> the binary be loaded into memory by EFI bootloaders 2) can dom0 access 
> EFI runtime services.  You're talking about "can it boot", which 
> minimally requires 1, and on some systems (i.e., systems that do not 
> provide appropriate ACPI tables) also requires 2.
> 
> So we already have #1 for both xenlinux and pvops; we just need #2. Is 
> that correct?

Yes, except that "just" is a gross understatement imo.

Also, just for clarification, runtime service access and getting at
the ACPI (and other) tables are two different things.

Jan


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