Re: [Qemu-devel] Re: [Spice-devel] paravirtual mouse/tablet

[Anthony Liguori]

On 01/13/2011 11:08 AM, Gerd Hoffmann wrote:
> On 01/13/11 16:55, Anthony Liguori wrote:
> > On 01/13/2011 05:51 AM, Gerd Hoffmann wrote:
> > > On 01/13/11 12:01, Stefan Hajnoczi wrote:
> > >
> > > > Can you elaborate how the spice display channel comes into play? On a
> > > > physical machine you just have input devices with no notion of
> > > > display. It's up to the windowing system to process input events and
> > > > handle multihead. Why does a pv tablet tie itself to a display
> > > > channel?
> > >
> > > You have two qxl devices, each linked to a spice display channel. The
> > > spice client will open one window for each channel. The mouse position
> > > is a triple consisting of (x, y, window/channel).
> >
> > Would be slightly cleaner to have multiple devices.
>
> Yea, right, that would work too.  If we have some way to assign a 
> display to a pvmouse device this works equally well.

I think that has to be outside of the device.  There are so many ways to 
map mice to multi heads.  In fact, one mouse could easily map to a 
single device.  It's almost something that really should be part of the 
guest configuration.

> > That maybe implies that we need an offscreen coordinate for the
> > mouse so that you can hide the mouse when it leaves one window.
>
> Hmm?  I fail to see why multihead is special here.

If you show two mice in the guest, would X render two cursors?

Regards,

Anthony Liguori

> cheers,
>   Gerd