Re: [Qemu-devel] [PATCH v5 06/16] apic: Introduce backend/frontend infrastructure for KVM reuse

[Anthony Liguori]

On 12/20/2011 07:57 AM, Paolo Bonzini wrote:
> On 12/20/2011 02:54 PM, Anthony Liguori wrote:
> > > In QOM parlance Jan implemented this:
> > >
> > > abstract class Object
> > > abstract class Device
> > > class APIC: { backend: link<APICBackend> }
> > > abstract class APICBackend
> > > class QEMU_APICBackend
> > > class KVM_APICBackend
> >
> > I don't fundamentally object to modeling it like this provided that it's
> > modeled (and visible) through qdev and not done through a one-off
> > infrastructure.
>
> There is no superclass of DeviceState, hence doing it through qdev would mean
> introducing a new bus type and so on. This would be a superb example of a
> useless bus that can disappear with QOM, but I don't see why we should take the
> pain to add it in the first place. :)

Right, so let's modeled it for now as inheritance which qdev can cope with.

> We sure can revisit this when the subclassing and interface infrastructures of
> QOM are merged.

I'll have patches out this week (just trying to write some more test cases). 
The latest series is below if you're interested.  I fear that it won't be until 
mid to late January before this can be merged though as I want to give folks 
like Markus a chance to review it.

https://github.com/aliguori/qemu/tree/qom-upstream.3

Regards,

Anthony Liguori

> Paolo