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

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 06/19/2010 10:50 AM, Pasi Kärkkäinen wrote:
> On Sat, Jun 19, 2010 at 06:40:10PM +0100, Jeremy Fitzhardinge wrote:
>   
>> On 06/19/2010 05:22 PM, Pasi Kärkkäinen wrote:
>>     
>>> On Sat, Jun 19, 2010 at 04:48:46PM +0100, Jeremy Fitzhardinge wrote:
>>>   
>>>       
>>>> On 06/19/2010 04:41 PM, Pasi Kärkkäinen wrote:
>>>>     
>>>>         
>>>>> On Tue, May 11, 2010 at 11:56:38AM +0100, Stefano Stabellini wrote:
>>>>>   
>>>>>       
>>>>>           
>>>>>> On Mon, 10 May 2010, Jeremy Fitzhardinge wrote:
>>>>>>     
>>>>>>         
>>>>>>             
>>>>>>> On 05/10/2010 07:41 AM, Stefano Stabellini wrote:
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>>>> On Fri, 7 May 2010, 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...

    J

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