Re: pvfb: Absolute vs relative mouse tracking mystery

["Pasi Kärkkäinen" <pasik@iki.fi>]

On Wed, Jul 21, 2010 at 06:01:28PM -0700, Jeremy Fitzhardinge wrote:
> >>>>>>>>                 
> >>>>>>>>> On one of my host machines, in PV guests using pvfb I get proper
> >>>>>>>>> absolute mouse tracking.
> >>>>>>>>>
> >>>>>>>>> On another host machine, I get relative tracking in pvfb-using guests.
> >>>>>>>>>
> >>>>>>>>> Both are using identical versions of Fedora 12, identical domain
> >>>>>>>>> configs, and toolstacks and kernels built from the same source.  The log
> >>>>>>>>> files of the X servers are more or less identical.
> >>>>>>>>>
> >>>>>>>>> Help?  Any clues?
> >>>>>>>>>
> >>>>>>>>>     
> >>>>>>>>>           
> >>>>>>>>>               
> >>>>>>>>>                   
> >>>>>>>> relative vs absolute depends on a node on xenstore called
> >>>>>>>> "request-abs-pointer" that defaults to 0 and has to be written by the
> >>>>>>>> guest.
> >>>>>>>>   
> >>>>>>>>         
> >>>>>>>>             
> >>>>>>>>                 
> >>>>>>> OK, it looks like it is being set, but the guest is still showing
> >>>>>>> relative behaviour:
> >>>>>>>
> >>>>>>>     vkbd = ""
> >>>>>>>      0 = ""
> >>>>>>>       backend = "/local/domain/0/backend/vkbd/5/0"
> >>>>>>>       backend-id = "0"
> >>>>>>>       state = "4"
> >>>>>>>       page-ref = "1137660"
> >>>>>>>       event-channel = "11"
> >>>>>>>       request-abs-pointer = "1"
> >>>>>>>
> >>>>>>> Does this mean qemu-dm's vnc server is not doing the right thing?
> >>>>>>>       
> >>>>>>>           
> >>>>>>>               
> >>>>>>  
> >>>>>> I think is probably xenfb (that is the framebuffer backend in qemu) that
> >>>>>> is not doing the right thing.
> >>>>>> Try adding some debug output in hw/xenfb.c:input_connect.
> >>>>>>
> >>>>>>     
> >>>>>>         
> >>>>>>             
> >>>>> Jeremy: Did you figure this out? I'm again seeing this problem on my Fedora 13 + Xen 4.0.1-rc3-pre box..
> >>>>>   
> >>>>>       
> >>>>>           
> >>>> Yes, that should be fixed in current xen-unstable - it was a xenbus
> >>>> race-condition.  What guest are you seeing it in?  I've found that I
> >>>> still don't get absolute pointers in Centos guests.
> >>>>
> >>>>     
> >>>>         
> >>> Yeah, it's a CentOS 5.5 guest that gets relative pointer on my Fedora 13 dom0.
> >>> On a CentOS5 dom0 it gets absolute though..
> >>>
> >>> Fedora 13 guest gets absolute pointer on my Fedora 13 dom0..
> >>>   
> >>>       
> >> Huh, that is interesting.  Maybe there's still a race or something there...
> >>
> >>     
> > Yeah.. maybe. Note that I'm running Xen 4.0.1-rc3-pre and not xen-unstable..
> >   
> 
> I just got a Win7 hvm domain working for the first time in a while, and
> found that it *isn't* getting proper abs updates.  I even set
> usbdevice='tablet' in its config...
> 

Ok. And reading my own lines above, I realize F13 worked for me earlier,
but it was centos 5.5 that didn't work.

I'll have to re-test things here aswell :)

-- Pasi