Re: [PATCH 7/8] qmp: add filtering of statistics by name

[Paolo Bonzini]

On 4/27/22 17:16, Dr. David Alan Gilbert wrote:
> * Paolo Bonzini (pbonzini@redhat.com) wrote:
> > On 4/27/22 14:34, Dr. David Alan Gilbert wrote:
> > > If I specify a 'vm' it's not obvious to me whether I'd get NICs and
> > > block devices in the future?
> >
> > VM would not get those (it's global statistics), but the size could balloon
> > if you specify no target at all.
> >
> > > Adding a syntax for 'all' into the vcpus list would fix that?
> >
> > I don't like having special syntax.  The current QAPI just doesn't filter
> > what is not in the arguments.
>
> Is there a object that represents the set of all vcpus?

No.

> > Yes, those would have different providers.  But a single target can support
> > multiple providers.
>
> Is that just for different implementations - kvm/hcf/tcg etc or do you
> envisage multiple providers on an object in a running VM?

I think multiple providers are possible for a single object, for example 
a device could expose both PCI (how many MSIs, etc.) and SCSI (how many 
commands sent/succeeded/failed) statistics.

Paolo