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xen-devel
Re: [Xen-devel] pvfb: Absolute vs relative mouse tracking mystery
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
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