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

[Paolo Bonzini]

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. :)

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

Paolo