[Spice-devel] [RFC PATCH spice v3 1/3] QXL interface: add a function to identify monitors in the guest

[Gerd Hoffmann]

On Thu, Nov 08, 2018 at 11:05:10AM +0100, Lukáš Hrázký wrote:
> Hello,
> 
> On Thu, 2018-11-08 at 07:49 +0100, Gerd Hoffmann wrote:
> >   Hi,
> > 
> > > + * The device_display_id_{start,count} denotes the sequence of device display
> > > + * IDs that map to the zero-based sequence of monitor IDs provided by monitors
> > > + * config on this interface. For example with device_display_id_start = 2 and
> > > + * device_display_id_count = 3 you get the following mapping:
> > > + * monitor_id  ->  device_display_id
> > > + *          0  ->  2
> > > + *          1  ->  3
> > > + *          2  ->  4
> > > + *
> > > + * Note this example is unsupported in practice. The only supported cases are
> > > + * either a single device display ID (count = 1) or multiple device display IDs
> > > + * in a sequence starting from 0.
> > 
> > This is confusing.  The usage of this api in the qemu counterpart looks
> > sane though.
> 
> Not sure what you find confusing in particular... The example? Using an
> example and then saying it's not supported?

Yes, that for example.  Also wondering why device_display_id doesn't
start at zero.

cheers,
  Gerd