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

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Andrew Cooper writes ("Re: [PATCH for-4.7] docs: Feature Levelling feature 
document"):
> On 01/06/16 11:25, Ian Jackson wrote:
> > 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.

Right.

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

IMO xl ought to have the moving parts necessary to allow an
administrator to: 1. collect feature information from their hosts;
2. combine that information into the desired feature set to expose to
guests; 3. specify the feature set in their host configuration; 4. do
all of the above conveniently, without seddery.

We should assume that the administrator has available tools like
GNU parallel, ansible, or whatever.

I don't want to design this now but I do want the feature levelling
documentation to welcome suggestions for it, or at least not to seem
to rule it out.

Ian.

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