Re: [Qemu-devel] [PATCH 4/4] qdev: add display capability

[Anthony Liguori]

Gerd Hoffmann wrote:
> On 08/11/09 15:42, Anthony Liguori wrote:
> > Gerd Hoffmann wrote:
> > > ... and tag devices.
> >
> > Shouldn't there be a direct relationship between a capability and the
> > interfaces the device accepts?
>
> That is the case for some devices only.

A device doesn't have a capability unless it implements the backend 
device interface, no?

That is, a device does not have the Display capability unless it returns 
a DisplayState.

> > That is, instead of explicitly marking something as having a capability
> > of { "ethernet" }, wouldn't you be able to infer that from the present
> > of a VLANClientState property?
>
> Works for ethernet (well, not yet, but most likely some day ...).
>
> What property do you use to identify sound devices?

A QEMUSoundCard * property (r/o).

> What property do you use to identify display devices?

A DisplayState * property (r/o).
> What property do you use to identify watchdog devices?

A WatchdogTimerModel * property (r/o).

Regards,

Anthony Liguori
> cheers,
>   Gerd