[Spice-devel] [Xen-devel] Is: QXL in Xen (busted) Was :Re: Xen 4.5-rc1 update (RC1 is out 2014-Oct-24th)

[Fabio Fantoni]

Il 06/11/2014 16:12, Fabio Fantoni ha scritto:
> Il 03/11/2014 17:03, Konrad Rzeszutek Wilk ha scritto:
>> On Mon, Nov 03, 2014 at 12:05:44PM +0100, Fabio Fantoni wrote:
>>> Il 31/10/2014 15:33, Konrad Rzeszutek Wilk ha scritto:
>>>>> I always posted all versions of the patch in xen-devel, the latest 
>>>>> was long
>>>>> time ago.
>>>> Sometimes you need to poke the maintainers. They (at least
>>>> I do) have mailboxes so packed that sometimes emails end up
>>>> going missing. But I think their arguments is going to be:
>>>> lets figure out what is broken before putting this in the source.
>>>>
>>>> .. snip..
>>>>>> Does SPICE always have to be enabled to use QXL?
>>>>>>
>>>> .. snip ..
>>>>> Xen with spice full working on both windows and linux (including
>>>>> save/restore) used for both vkvm and thin client I think would be 
>>>>> perfect.
>>>> Right. But there is some work needed in that area (figure out what
>>>> is happening on Linux).
>>>>
>>>> ..snip..
>>>>>> OK, looking at how the driver is setup - it seems that there is 
>>>>>> an QXL
>>>>>> KMS driver. If you boot without Xorg running but just with in the 
>>>>>> console
>>>>>> can
>>>>>> you use 'fbset' or any other framebuffer tools (linux-fb-tools)?
>>>>>> That is I am curious to see whether the 'FB' is working properly 
>>>>>> first
>>>>>> before figuring out whether Xorg is working.
>>>>>>
>>>>> Some tests ago I tried without xorg to see if kernel parts is ok 
>>>>> (advice of
>>>>> other developer) and seems was ok.
>>>> What did you test? There is an 'drm-test' tool that was floating 
>>>> around?
>>>> (http://cgit.freedesktop.org/mesa/drm/)
>>>>
>>>> It allows you to run most (if not all) of the Xorg functionality - but
>>>> using an tool from user-space - and with much more exposure of what
>>>> went wrong.
>>>>
>>>> Could you try the following (without having Xorg in either guest):
>>>>   1). Boot up your KVM guest, install said tool - run it. Record what
>>>>      works and what does not.
>>>>
>>>>   2). Boot up your Xen guest, and do the same thing.
>>>>
>>>> That should narrow down which of the hundreds' of DRM ioctls is 
>>>> failing
>>>> when using spice under Xen. And that ought to help narrow down this 
>>>> further.
>>>>
>>>> I can help you a bit by sending you some debug patches, thought I do
>>>> have to warn you that I am under a lot of time-pressure so my response
>>>> is not as fast as I would want it to be.
>>>>
>>> I tested only without xorg, just console with drm without particular 
>>> tests.
>>>
>>> I can't find the drm-test tool you mentioned, is it available in debian
>>> and/or fedora repositories an what is it called?
>>> I also did a quick google search and found only something about 
>>> wayland and
>>> not about X.org.
>> I mentioned the URL in the email, but here it is again:
>>
>> http://cgit.freedesktop.org/mesa/drm/
>>
>> You will need to compile it, etc.
>
> Thanks for your reply, sorry for my late reply, I was busy.
> I prepared 2 Trusty (ubuntu 14.04) vm minimal for the tests (one on 
> kvm and one on xen).
> Started and both arrive to console login successfull and they have qxl 
> kernel module active:
>
> lsmod
> ...
> qxl
> drm_kms_helper qxl
> drm qxl,ttm,drm_kms_helper
> ...
>
> I downloaded compile and installed mesa/drm from git master brach
> ./configure
> make
> sudo make install
>
> After I tried to execute the tests binary I found under test but all 
> fails:
> sudo ./modetest
> ...
> no device found.
>
> sudo ./vbltest
> ...
> failed to load any modules, aborting.
>
> sudo ./kmstest
> main: Could not open device (Operation not permitted)
>
> Same result on both xen and kvm.
> Seems that there is any module in mesa/drm about qxl even if kernel 
> modules is present and active and qxl xorg driver use it FWIK.
>
> I did another fast search on google without found how to test qxl drm 
> to find the difference between xen and kvm.
> Someone can tell me what I must do to take useful data about xen and 
> kvm difference for qxl problem?
>
> I added also spice-devel to cc.
>
> Thanks for any reply and sorry for my bad english.

Ping...
Is there nobody that can help me please?