Den 11 jul 2016 11:37 fm skrev Arman Khalatyan <arm2...@gmail.com>:
>
> I just testing several GPUs with pci-passthrough: GTX630, Tesla 2050 and 
> FX5800.
> None of them I got running with opengl/direct rendering inside the virtual 
> machine.
> I was thinking something to do with qxl driver, but after blacklisting it in 
> the VMs kernel nothing was changed.
> The VMs Xorg claiming always no display found even if I configure it with 
> headless option: nvidia-xconfig -a --use-display-device=None 
> --virtual=1280x1024
> But with nvidia-smi I can see the GPU status, and I can run all cuda tests 
> where opengl/X11 is not involved.
> My test system is CentOS 7 with ovirt 4.
> BTW If I clone VM which was not running, to real host on bare metal, 
> everything is running as expecting.

Don't remember If this was mentioned but have you tried doing the same thing 
but with virt-manager on a standalone host, just to rule out oVirt from the 
equation?

/K
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> ***********************************************************
>
>  Dr. Arman Khalatyan  eScience -SuperComputing
>  Leibniz-Institut für Astrophysik Potsdam (AIP)
>  An der Sternwarte 16, 14482 Potsdam, Germany
>
> ***********************************************************
>
> On Mon, Jul 11, 2016 at 9:06 AM, Martin Polednik <mpoled...@redhat.com> wrote:
>>
>> On 08/07/16 11:29 +0200, Michal Skrivanek wrote:
>>>
>>>
>>>> On 06 Jul 2016, at 14:06, Francesco Romani <from...@redhat.com> wrote:
>>>>
>>>>
>>>> From: "Arman Khalatyan" <arm2...@gmail.com>
>>>> To: "users" <users@ovirt.org>
>>>> Sent: Monday, July 4, 2016 11:52:24 AM
>>>> Subject: [ovirt-users] Is it possible to disable qxl video?
>>>>
>>>>
>>>> Hi,
>>>> I am doing PCI Passthrough for GPUs.
>>>> Is it possible somehow to disable/remove default video qxl?
>>>> thanks,
>>>> Arman,.
>>>> Hi,
>>>>
>>>> The 4.0 Vdsm allows you to run a headless VM, meaning a VM without graphic 
>>>> device/frontend.
>>>> Not sure Engine allows you that however.
>>>
>>>
>>> no it doesn’t
>>
>>
>> Even if engine allowed that, it may not be the correct solution.
>>
>> Running headless with PCI passthrough is considered primary VGA
>> passthrough[1]. Using primary VGA passthrough without OVMF could cause
>> (will cause) quite a bit of headaches.
>>
>> If you really want to try that, I assume using before_vm_start hook to
>> remove the video device should be enough.
>>
>> [1] http://wiki.xenproject.org/wiki/Xen_VGA_Passthrough - it's
>> possible to read about primary and secondary passthrough between the
>> lines
>>
>>> However, if QXL is the problem (why is that so?) then you can switch to 
>>> VGA(or CIRRUS if this is still 3.6)
>>>
>>>> I'm afraid you will need to write a Vdsm hook.
>>>>
>>>> There could be simpler solutions depending on the Engine
>>>>
>>>> Bests,
>>>>
>>>> --
>>>> Francesco Romani
>>>> RedHat Engineering Virtualization R & D
>>>> Phone: 8261328
>>>> IRC: fromani
>>>> _______________________________________________
>>>> Users mailing list
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>>>> <http://lists.ovirt.org/mailman/listinfo/users>
>>
>>
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>
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