Re: [Qemu-devel] [PATCH v2 00/18] qom: dynamic properties and composition tree (v2)

[Anthony Liguori]

On 12/05/2011 09:47 AM, Paolo Bonzini wrote:
> On 12/05/2011 03:36 PM, Anthony Liguori wrote:
> > No. A device is-a interface. Hopefully the above example will make it
> > more clear.
>
> No, but I'm confident that there will be a sane way to access the list of
> interfaces that you embed in the Object type. :)

We definitely need to think through introspection.  There are a few things we 
need to address with introspection:

0) What are all of the classes available

1) What are all of the classes/interfaces implemented by a type

2) What are all of the properties available in a class

(0) and (1) just need QMP interfaces.  It's very straight forward.

(2) is a bit more tricky.  You can instantiate a dummy object and introspect on 
the live object.  Dynamic properties make that a bit challenging through.

> > Maybe now is the right time to rename the legacy properties to all be
> > prefixed with qdev-? That way we don't need to introduce two different
> > types for a single property.
>
> Why do you need such a prefix?

To avoid an all-at-once conversion.  I don't want to break -device and 
maintaining string properties make it quite a bit easier to support -device.

I'd like to leave the string properties in place until we have a good way to 
create objects via QMP.

My rough thinking is that we keep -device around until 2.0.

Regards,

Anthony Liguori

> Paolo