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Date: Thu, 13 Jan 2011 14:41:22 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] Re: [Spice-devel] paravirtual mouse/tablet
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, spice-devel <spice-devel@lists.freedesktop.org>

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
>