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<p dir="ltr"><br>
Den 11 jul 2016 11:37 fm skrev Arman Khalatyan <arm2arm@gmail.com>:<br>
><br>
> I just testing several GPUs with pci-passthrough: GTX630, Tesla 2050 and FX5800.<br>
> None of them I got running with opengl/direct rendering inside the virtual machine.<br>
> I was thinking something to do with qxl driver, but after blacklisting it in the VMs kernel nothing was changed.
<br>
> 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
<br>
> But with nvidia-smi I can see the GPU status, and I can run all cuda tests where opengl/X11 is not involved.<br>
> My test system is CentOS 7 with ovirt 4.<br>
> BTW If I clone VM which was not running, to real host on bare metal, everything is running as expecting.</p>
<p dir="ltr">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?</p>
<p dir="ltr">/K<br>
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> ***********************************************************<br>
><br>
> Dr. Arman Khalatyan eScience -SuperComputing <br>
> Leibniz-Institut für Astrophysik Potsdam (AIP) <br>
> An der Sternwarte 16, 14482 Potsdam, Germany <br>
><br>
> ***********************************************************<br>
><br>
> On Mon, Jul 11, 2016 at 9:06 AM, Martin Polednik <mpolednik@redhat.com> wrote:<br>
>><br>
>> On 08/07/16 11:29 +0200, Michal Skrivanek wrote:<br>
>>><br>
>>><br>
>>>> On 06 Jul 2016, at 14:06, Francesco Romani <fromani@redhat.com> wrote:<br>
>>>><br>
>>>><br>
>>>> From: "Arman Khalatyan" <arm2arm@gmail.com><br>
>>>> To: "users" <users@ovirt.org><br>
>>>> Sent: Monday, July 4, 2016 11:52:24 AM<br>
>>>> Subject: [ovirt-users] Is it possible to disable qxl video?<br>
>>>><br>
>>>><br>
>>>> Hi,<br>
>>>> I am doing PCI Passthrough for GPUs.<br>
>>>> Is it possible somehow to disable/remove default video qxl?<br>
>>>> thanks,<br>
>>>> Arman,.<br>
>>>> Hi,<br>
>>>><br>
>>>> The 4.0 Vdsm allows you to run a headless VM, meaning a VM without graphic device/frontend.<br>
>>>> Not sure Engine allows you that however.<br>
>>><br>
>>><br>
>>> no it doesn’t<br>
>><br>
>><br>
>> Even if engine allowed that, it may not be the correct solution.<br>
>><br>
>> Running headless with PCI passthrough is considered primary VGA<br>
>> passthrough[1]. Using primary VGA passthrough without OVMF could cause<br>
>> (will cause) quite a bit of headaches.<br>
>><br>
>> If you really want to try that, I assume using before_vm_start hook to<br>
>> remove the video device should be enough.<br>
>><br>
>> [1] http://wiki.xenproject.org/wiki/Xen_VGA_Passthrough - it's<br>
>> possible to read about primary and secondary passthrough between the<br>
>> lines<br>
>><br>
>>> However, if QXL is the problem (why is that so?) then you can switch to VGA(or CIRRUS if this is still 3.6)<br>
>>><br>
>>>> I'm afraid you will need to write a Vdsm hook.<br>
>>>><br>
>>>> There could be simpler solutions depending on the Engine<br>
>>>><br>
>>>> Bests,<br>
>>>><br>
>>>> --<br>
>>>> Francesco Romani<br>
>>>> RedHat Engineering Virtualization R & D<br>
>>>> Phone: 8261328<br>
>>>> IRC: fromani<br>
>>>> _______________________________________________<br>
>>>> Users mailing list<br>
>>>> Users@ovirt.org <mailto:Users@ovirt.org><br>
>>>> http://lists.ovirt.org/mailman/listinfo/users <http://lists.ovirt.org/mailman/listinfo/users><br>
>><br>
>><br>
>>> _______________________________________________<br>
>>> Users mailing list<br>
>>> Users@ovirt.org<br>
>>> http://lists.ovirt.org/mailman/listinfo/users<br>
>><br>
>><br>
><br>
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