Re: [Qemu-devel] [PATCH 0/3] qmp: query-host-cpu command

[David Hildenbrand]

> On Tue, Jun 21, 2016 at 08:20:40AM +0200, David Hildenbrand wrote:
> > > Add QMP command to allow management software to query for
> > > CPU information for the running host.
> > > 
> > > The data returned by the command is in the form of a dictionary
> > > of QOM properties.
> > > 
> > > This series depends on the "Add runnability info to
> > > query-cpu-definitions" series I sent 2 weeks ago.
> > > 
> > > Git tree:
> > >   https://github.com/ehabkost/qemu-hacks.git work/query-host-cpu
> > >   
> > 
> > I like that interface, I'm going to post (maybe today? :) ) a similar 
> > interface
> > that allows to also expand other cpu models, not just the host model.  
> 
> In x86 I want to avoid exposing the details of other CPU models
> to libvirt because the details depend on machine-type.
> 
> But if it is useful for you, I believe the same "qom-properties"
> dict could be returned in query-cpu-definitions.
> 
> > 
> > Maybe we can then decide which one makes sense for all of us. But in 
> > general,
> > this interface is much better compared to what we had before.   
> 
> Maybe both? I think it's better to have a separate interface for
> querying "what exactly this host supports" and another one for
> querying for "what happens if I use -cpu host". In the case of
> x86, both are equivalent, but we can't guarantee this on all
> architectures.
> 

I'll post my patches in a couple of minutes, let's discuss it then.

We might want to avoid having multiple interfaces carrying out the same task.

David