>>> On 21.05.15 at 12:52, <julien.gr...@citrix.com> wrote:
> On 21/05/15 11:46, Jan Beulich wrote:
>>>>> On 21.05.15 at 12:34, <julien.gr...@citrix.com> wrote:
>>> On 21/05/15 07:22, Jan Beulich wrote:
>>>> The linked to document (on our wiki) is versioned 0.<something>,
>>>> which doesn't look like a final stable version. The same applies to
>>>> the other (STAO?) one.
>>>
>>> That's a mistake in the version number. Those tables has been reviewed
>>> by Citrix and Linaro people and we agreed about the final tables.
>> 
>> And Citriy+Linaro are the standardizing body here? With no-one
>> else involved?
> 
> The content of this table is handled by Xen Project and can be modified
> at our convenience during the review process.

Now that reads as if the table contents and layout are _not_
stable yet.

>>>> Which seems superseded by 6.0's hypervisor vendor identification
>>>> in FADT. And the OEM IDs in various table headers could have
>>>> served such identification purposes too, as could have "OEMx"
>>>> tables.
>>>
>>> ACPI 6.0 has been released few months after Parth and Naresh began to
>>> implement ACPI for Xen. We could take advantage of this new field.
>> 
>> If at all possible - yes please, in favor of any custom tables.
> 
> It would still be necessary to expose the event channel, grant table
> region...

Sure, but once you know you run on Xen you could retrieve it via
hypercall if there's no other means.

Jan


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