Re: [ovirt-users] Is it possible to disable qxl video?
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On 11/07/16 09:46 +0000, Karli Sjöberg wrote:
Den 11 jul 2016 11:37 fm skrev Arman Khalatyan <arm2arm@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?
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@redhat.com> wrote:
On 08/07/16 11:29 +0200, Michal Skrivanek wrote:
On 06 Jul 2016, at 14:06, Francesco Romani <fromani@redhat.com> wrote:
From: "Arman Khalatyan" <arm2arm@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 Users@ovirt.org <mailto:Users@ovirt.org> http://lists.ovirt.org/mailman/listinfo/users <http://lists.ovirt.org/mailman/listinfo/users>
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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@redhat.com> wrote:
On 11/07/16 09:46 +0000, Karli Sjöberg wrote:
Den 11 jul 2016 11:37 fm skrev Arman Khalatyan <arm2arm@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?
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@redhat.com> wrote:
On 08/07/16 11:29 +0200, Michal Skrivanek wrote:
On 06 Jul 2016, at 14:06, Francesco Romani <fromani@redhat.com> wrote:
From: "Arman Khalatyan" <arm2arm@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 Users@ovirt.org <mailto:Users@ovirt.org> http://lists.ovirt.org/mailman/listinfo/users < http://lists.ovirt.org/mailman/listinfo/users>
_______________________________________________
Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
On 11/07/16 17:16 +0200, Arman Khalatyan wrote:
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.
This applies to GPUs that NVIDIA does not support in virtualized environments (actually your GTX630). Quadro K2200 and higher (incl. grid, tesla) should not require masking the hypervisor. It could be worth to supply dmesg from the host and from the guest so we could see if there is any apparent failure. That being said, I have had failures even with supported card that just stopped at one point. It's worth trying the kvm=off trick.
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'
I usually take the qemu command line from /var/log/libvirt/qemu/${VM_NAME}, tweak it in vim and launch. Works even for oVirt VMs (if you can hack around the storage).
***********************************************************
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@redhat.com> wrote:
On 11/07/16 09:46 +0000, Karli Sjöberg wrote:
Den 11 jul 2016 11:37 fm skrev Arman Khalatyan <arm2arm@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?
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@redhat.com> wrote:
On 08/07/16 11:29 +0200, Michal Skrivanek wrote:
On 06 Jul 2016, at 14:06, Francesco Romani <fromani@redhat.com> wrote: > > > From: "Arman Khalatyan" <arm2arm@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 > Users@ovirt.org <mailto:Users@ovirt.org> > http://lists.ovirt.org/mailman/listinfo/users < > http://lists.ovirt.org/mailman/listinfo/users> >
_______________________________________________
Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Thanks for clarification. the kvm=off solved the problem. NICE!!! I got now inside the VM: OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce GT 630/PCIe/SSE2 OpenGL core profile version string: 4.4.0 NVIDIA 367.27 OpenGL core profile shading language version string: 4.40 NVIDIA via Cg compiler OpenGL core profile context flags: (none) the steps to reproduce: 1) virsh edit render 2) change schema of xml: <domain type='kvm' xmlns:qemu=' http://libvirt.org/schemas/domain/qemu/1.0'> 3) add following in the end before </domain>: <qemu:commandline> <qemu:arg value='-cpu'/> <qemu:arg value='host,kvm=off'/> </qemu:commandline> 4) start vm, install nvidia driver, check gpu: nvidia smi 5) install virtualgl, init 3 6) nvidia-xconfig --enable-all-gpus --separate-x-screens --use-display-device=None --virtual=1280x1024 init 5 7) vglconnet render01.vm and finally: vglrun glxinfo or whatever!!! Now back to origin: how to add this tweak in to ovirt?? :) *********************************************************** Dr. Arman Khalatyan eScience -SuperComputing Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, 14482 Potsdam, Germany *********************************************************** On Mon, Jul 11, 2016 at 5:30 PM, Martin Polednik <mpolednik@redhat.com> wrote:
On 11/07/16 17:16 +0200, Arman Khalatyan wrote:
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.
This applies to GPUs that NVIDIA does not support in virtualized environments (actually your GTX630). Quadro K2200 and higher (incl. grid, tesla) should not require masking the hypervisor. It could be worth to supply dmesg from the host and from the guest so we could see if there is any apparent failure.
That being said, I have had failures even with supported card that just stopped at one point. It's worth trying the kvm=off trick.
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'
I usually take the qemu command line from /var/log/libvirt/qemu/${VM_NAME}, tweak it in vim and launch. Works even for oVirt VMs (if you can hack around the storage).
***********************************************************
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@redhat.com> wrote:
On 11/07/16 09:46 +0000, Karli Sjöberg wrote:
Den 11 jul 2016 11:37 fm skrev Arman Khalatyan <arm2arm@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?
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@redhat.com
wrote:
On 08/07/16 11:29 +0200, Michal Skrivanek wrote:
> > On 06 Jul 2016, at 14:06, Francesco Romani <fromani@redhat.com> > wrote: > >> >> >> From: "Arman Khalatyan" <arm2arm@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 >> Users@ovirt.org <mailto:Users@ovirt.org> >> http://lists.ovirt.org/mailman/listinfo/users < >> http://lists.ovirt.org/mailman/listinfo/users> >> >> > _______________________________________________
> Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > >
On 11/07/16 18:03 +0200, Arman Khalatyan wrote:
Thanks for clarification. the kvm=off solved the problem. NICE!!! I got now inside the VM: OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce GT 630/PCIe/SSE2 OpenGL core profile version string: 4.4.0 NVIDIA 367.27 OpenGL core profile shading language version string: 4.40 NVIDIA via Cg compiler OpenGL core profile context flags: (none)
the steps to reproduce: 1) virsh edit render 2) change schema of xml: <domain type='kvm' xmlns:qemu=' http://libvirt.org/schemas/domain/qemu/1.0'> 3) add following in the end before </domain>: <qemu:commandline> <qemu:arg value='-cpu'/> <qemu:arg value='host,kvm=off'/> </qemu:commandline> 4) start vm, install nvidia driver, check gpu: nvidia smi 5) install virtualgl, init 3 6) nvidia-xconfig --enable-all-gpus --separate-x-screens --use-display-device=None --virtual=1280x1024 init 5 7) vglconnet render01.vm and finally: vglrun glxinfo or whatever!!!
Now back to origin: how to add this tweak in to ovirt?? :)
We have hooks just for that! You'll want before_vm_start hook point. Some idea how the hook could look like: $ pwd /usr/libexec/vdsm/hooks/before_vm_start $ cat 99_maskkvm #!/usr/bin/python import hooking if __name__ == '__main__': domxml = hooking.read_domxml() domain = domxml.getElementsByTagName('domain')[0] cmdline = domxml.createElement('qemu:commandline') for arg in ('-cpu', 'host,kvm=off'): cmdline_arg = domxml.createElement('qemu:arg') cmdline_arg.setAttribute('value', arg) cmdline.appendChild(cmdline_arg) domain.appendChild(cmdline) hooking.write_domxml(domxml) The hook must be installed on every host that you expect to run passthrough VMs. mpolednik
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Dr. Arman Khalatyan eScience -SuperComputing Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, 14482 Potsdam, Germany
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On Mon, Jul 11, 2016 at 5:30 PM, Martin Polednik <mpolednik@redhat.com> wrote:
On 11/07/16 17:16 +0200, Arman Khalatyan wrote:
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.
This applies to GPUs that NVIDIA does not support in virtualized environments (actually your GTX630). Quadro K2200 and higher (incl. grid, tesla) should not require masking the hypervisor. It could be worth to supply dmesg from the host and from the guest so we could see if there is any apparent failure.
That being said, I have had failures even with supported card that just stopped at one point. It's worth trying the kvm=off trick.
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'
I usually take the qemu command line from /var/log/libvirt/qemu/${VM_NAME}, tweak it in vim and launch. Works even for oVirt VMs (if you can hack around the storage).
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Dr. Arman Khalatyan eScience -SuperComputing Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, 14482 Potsdam, Germany
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On Mon, Jul 11, 2016 at 11:55 AM, Martin Polednik <mpolednik@redhat.com> wrote:
On 11/07/16 09:46 +0000, Karli Sjöberg wrote:
Den 11 jul 2016 11:37 fm skrev Arman Khalatyan <arm2arm@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?
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
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Dr. Arman Khalatyan eScience -SuperComputing Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, 14482 Potsdam, Germany
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On Mon, Jul 11, 2016 at 9:06 AM, Martin Polednik <mpolednik@redhat.com > wrote:
> On 08/07/16 11:29 +0200, Michal Skrivanek wrote: > > >> >> On 06 Jul 2016, at 14:06, Francesco Romani <fromani@redhat.com> >> wrote: >> >>> >>> >>> From: "Arman Khalatyan" <arm2arm@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 >>> Users@ovirt.org <mailto:Users@ovirt.org> >>> http://lists.ovirt.org/mailman/listinfo/users < >>> http://lists.ovirt.org/mailman/listinfo/users> >>> >>> >> > _______________________________________________ > >> Users mailing list >> Users@ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> >> > > >
participants (3)
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Arman Khalatyan -
Karli Sjöberg -
Martin Polednik