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[placement][nova][ptg] Resourceless trait filters

On Apr 9, 2019, at 12:22 PM, Chris Dent <cdent+os at anticdent.org> wrote:
>        * (My brain hurts from the concept for a provider that
>          provides nothing. Perhaps it provides something we aren't
>          remembering to count?)

This was a big bone of contention back when Traits were first being discussed: they can only be applied to RPs. So if you had a single physical PCI device that provided virtual functions, and some of those VFs were, say, private net and the others were public, you had to create intermediary RPs between the PCI RP and the VFs so that you could tag those RPs with the correct trait to distinguish them.

That brain hurt is very much why I argued against this restriction back then. But it's what we ended up with, so those "virtual" RPs are with us for good. If it helps, think of them as not providing resources, but providing other resource providers. 

Does that hurt a little less?

-- Ed Leafe