[Xen-devel] Re: Problems with guest mouse Was: More issues with xl on 4.1.0-rc

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sun, 6 Mar 2011, M A Young wrote:
> On Fri, 4 Feb 2011, Stefano Stabellini wrote:
> 
> > On Fri, 4 Feb 2011, M A Young wrote:
> >> On Fri, 4 Feb 2011, M A Young wrote:
> >>
> >>> On Fri, 4 Feb 2011, Stefano Stabellini wrote:
> >>>
> >>>> On Fri, 4 Feb 2011, M A Young wrote:
> >>>>> On Fri, 4 Feb 2011, Stefano Stabellini wrote:
> >>>>>
> >>>>>> On Thu, 3 Feb 2011, M A Young wrote:
> >>>>>>> I have spotted another couple of bugs when testing with xl on 4.1.0-rc
> >>>>>>> and
> >>>>>>> a xen/next-2.6.38 based kernel.
> >>>>>>>
> >>>>>>> If I set vfb = [ 'sdl' ] in the configuration file, then I can type in
> >>>>>>> the
> >>>>>>> window produced, but the mouse doesn't work (the pointer stays fixed 
> >>>>>>> in
> >>>>>>> the middle of the window). Alao clicking on the window doesn't trigger
> >>>>>>> the
> >>>>>>> "grab keyboard and mouse" mode, though I can manually trigger it and
> >>>>>>> leave
> >>>>>>> it using the ctrl-alt key combination.
> >>>>>>
> >>>>>> ... I cannot reproduce the second one
> >>>>>> (however I am using X remoting because I don't have an X server on my
> >>>>>> testbox).
> >>>>>
> >>>>> Thanks for the first fix. The mouse problem is reproducible over remote 
> >>>>> X
> >>>>> (ssh -X) and if I use vnc rather than sdl. Do you have any idea how we
> >>>>> might debug this?
> >>>>
> >>>> Does the mouse work if you just have the console and gpm in the guest?
> >>>> What is the output of "xenstore-ls /local/domain/$DOMID/device/vkbd"?
> >>>
> >>> The mouse mostly works with a console and gpm - I get a reverse video 
> >>> cursor
> >>> which will move, cut and paste, though it isn't quite in step with where 
> >>> the
> >>> pointer would be, eg. if I enter the window from the bottom the cursor
> >>> appears more to the right than it should be.
> >>
> >
> > If you are getting mouse events in the guest's kernel, I think the basic
> > mechanism must be working correctly.
> > Could it be a problem with your xserver?
> >
> > Otherwise you need to add some printf in qemu in
> > hw/xenfb.c:xenfb_mouse_event.
> 
> I am still having problems with this. My debugging output of 
> xenfb_mouse_event looked the same as a different computer that didn't have 
> the proble. Do you have any further debugging suggestions?
 
Is there any difference in the VMs between the system that works and the
one that does not? In particular I am think about kernel or xorg
versions.

You could try to add some debug messages to
drivers/input/xen-kbdfront.c:input_handler in the guest kernel and see
if you are actually receiving the events you should be receiving.

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