Re: [Xen-devel] [PATCH for-4.7] docs: Feature Levelling feature document

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 01/06/16 11:25, Ian Jackson wrote:
> Andrew Cooper writes ("[PATCH for-4.7] docs: Feature Levelling feature 
> document"):
>> +N.B. `xl`, being inherently a single-host toolstack, doesn't make use of 
>> these
>> +levelling improvements.  These features are of interest to higher level
>> +toolstacks such as `libvirt` or `XAPI`.
> I don't think this is quite the right spin, IYSWIM.  xl does not
> currently provide any way to sort this stuff out.  But in principle, I
> think there would be ways that it could.
>
> I would prefer a wording which was more encouraging to future
> improvements.  Shall I suggest something ?

I guess there are two different issues here.  (Note: I am specifically
distinguishing `xl` as a toolstack itself, from libxl which is a just a
library.)

Simply exposing the levelling/featureset information in `xl info` is
certainly a possible thing to do.  Joao has some plans for surfacing the
levelling information in libxl for libvirt to use.

However, without a fundamental redesign of how xl works, it isn't going
to gain multi-host knowledge and consideration during domain creation.

~Andrew

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