Re: [ovirt-users] Is it possible to disable qxl video?

Yes I have a BusID inside the xorg.conf. I just tested with virt-manager and indeed it is not a ovirt failure. It is something to do with qemu-kvm + nvidia. I found here:https://wiki.debian.org/VGAPassthrough that nvidia disables device when it is running on qemu-kvm is it still the case? to overcome that one need to set: -cpu host,kvm=off in the command line of qemu.

I was trying to convert virsh commands to qemu native, but it fails on Centos 7 :( virsh dumpxml > render.xml virsh domxml-to-native qemu-argv render.xml error: internal error: invalid PCI passthrough type 'default'

*********************************************************** Dr. Arman Khalatyan eScience -SuperComputing Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, 14482 Potsdam, Germany *********************************************************** On Mon, Jul 11, 2016 at 11:55 AM, Martin Polednik <mpolednik(a)redhat.com&gt; wrote: > On 11/07/16 09:46 +0000, Karli Sjöberg wrote: > >> >> Den 11 jul 2016 11:37 fm skrev Arman Khalatyan <arm2arm(a)gmail.com&gt;: >> >>> >>> 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? >> > > Also, the xorg must be setup to use the VFIO GPU. There is BusID > option in device section that must point to the guest address of the > GPU. I'm not sure if you've done that (and I'm quite sure it's missing > on the wiki, noted). > > [in the guest] > $ lspci | grep VGA > 03:00.0 VGA compatible controller: NVIDIA Corporation GM107GL [Quadro > K2200] (rev a2) > > and using the address, add device section to /etc/X11/xorg.conf > > Section "Device" > Identifier "Device0" > Driver "nvidia" > VendorName "NVIDIA Corporation" > BusID "PCI:3:0:0" > EndSection > > That should allow xorg to use the assigned GPU. > > mpolednik > > > /K >> >>> >>> >>> >>> >>> >>> >>> >>> *********************************************************** >>> >>> 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 <mpolednik(a)redhat.com&gt; >>> wrote: >>> >>>> >>>> On 08/07/16 11:29 +0200, Michal Skrivanek wrote: >>>> >>>>> >>>>> >>>>> On 06 Jul 2016, at 14:06, Francesco Romani <fromani(a)redhat.com&gt; wrote: >>>>>> >>>>>> >>>>>> From: "Arman Khalatyan" <arm2arm(a)gmail.com&gt; >>>>>> To: "users" <users(a)ovirt.org&gt; >>>>>> 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 >>>>>> Users(a)ovirt.org <mailto:Users@ovirt.org> >>>>>> http://lists.ovirt.org/mailman/listinfo/users < >>>>>> http://lists.ovirt.org/mailman/listinfo/users> >>>>>> >>>>> >>>> >>>> _______________________________________________ >>>>> Users mailing list >>>>> Users(a)ovirt.org >>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>> >>>> >>>> >>>> >>>