How to change video driver from qxl -> {virtio-gpu}

[Nirmoy]

So I have looked into [1] but couldn't figure out a way to change video driver in the VM.

Is there a way to have different video driver than qxl ? 

[1] https://kubevirt.io/api-reference/master/definitions.html

Regards,

Nirmoy

[Roman Mohr]

Hi,

On Tue, Apr 6, 2021 at 2:00 PM Nirmoy <nirmoy...@gmail.com> wrote:

So I have looked into [1] but couldn't figure out a way to change video driver in the VM.

Is there a way to have different video driver than qxl ? 

No, that is not possible. We add a very low-res vga card to the VM for admin-access purposes via VNC.

What would you need?

Best regards,

Roman

 

[1] https://kubevirt.io/api-reference/master/definitions.html

Regards,

Nirmoy

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[nirmoy das]

Hi Roman, 

Thanks for your reply. 

I am working on creating CI jobs to test kernel GPU drivers with kubevirt on Kubernetes and Zuul. Hence I was 

wondering if there is a way to change video hw in kubevirt.

Regards,

Nirmoy

[Roman Mohr]

On Mon, Apr 12, 2021 at 12:01 PM nirmoy das <nirmoy...@gmail.com> wrote:

Hi Roman, 

Thanks for your reply. 

I am working on creating CI jobs to test kernel GPU drivers with kubevirt on Kubernetes and Zuul. Hence I was 

wondering if there is a way to change video hw in kubevirt.

I am not sure if it helps, but you can pass through real GPUs from the host: https://kubevirt.io/user-guide/virtual_machines/host-devices/#host-devices-assignment.

Which exact configurations were you looking for?

Best Regards,

Roman

[nirmoy das]

Hi Roman, 

On Mon, 12 Apr 2021 at 12:51, Roman Mohr <rm...@redhat.com> wrote:

On Mon, Apr 12, 2021 at 12:01 PM nirmoy das <nirmoy...@gmail.com> wrote:

Hi Roman, 

Thanks for your reply. 

I am working on creating CI jobs to test kernel GPU drivers with kubevirt on Kubernetes and Zuul. Hence I was 

wondering if there is a way to change video hw in kubevirt.

I am not sure if it helps, but you can pass through real GPUs from the host: https://kubevirt.io/user-guide/virtual_machines/host-devices/#host-devices-assignment.

Yes, this is something I want to use for real GPU drivers and it is in my TODO list. But kernel changes also affect virtual GPUs like qxl/virtio-gpu/Bochs[1]. So 

I want to make sure that I can boot a VM with a virtual GPU and load the kernel diver and see if something bad happened.

 

Which exact configurations were you looking for?

Something like the below configuration would be nice. I started looking into the kubevirt  codebase to see if I can come up with a quick RFC patch(looks like it might take some time for me)

devices:

  video:

    - qxl: 

         memory: 1024

     - virtio:

          memory: 1024

          virgl: on 

[1] https://www.kraxel.org/blog/2019/09/display-devices-in-qemu/

Regards,

Nirmoy

.....

 

Best Regards,

Roman

 

Regards,

Nirmoy

On Mon, 12 Apr 2021 at 10:46, Roman Mohr <rm...@redhat.com> wrote:

Hi,

On Tue, Apr 6, 2021 at 2:00 PM Nirmoy <nirmoy...@gmail.com> wrote:

So I have looked into [1] but couldn't figure out a way to change video driver in the VM.

Is there a way to have different video driver than qxl ? 

No, that is not possible. We add a very low-res vga card to the VM for admin-access purposes via VNC.

What would you need?

Best regards,

Roman

 

[1] https://kubevirt.io/api-reference/master/definitions.html

Regards,

Nirmoy

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[Roman Mohr]

On Mon, Apr 12, 2021 at 1:20 PM nirmoy das <nirmoy...@gmail.com> wrote:

Hi Roman, 

On Mon, 12 Apr 2021 at 12:51, Roman Mohr <rm...@redhat.com> wrote:

On Mon, Apr 12, 2021 at 12:01 PM nirmoy das <nirmoy...@gmail.com> wrote:

Hi Roman, 

Thanks for your reply. 

I am working on creating CI jobs to test kernel GPU drivers with kubevirt on Kubernetes and Zuul. Hence I was 

wondering if there is a way to change video hw in kubevirt.

I am not sure if it helps, but you can pass through real GPUs from the host: https://kubevirt.io/user-guide/virtual_machines/host-devices/#host-devices-assignment.

Yes, this is something I want to use for real GPU drivers and it is in my TODO list. But kernel changes also affect virtual GPUs like qxl/virtio-gpu/Bochs[1]. So 

I want to make sure that I can boot a VM with a virtual GPU and load the kernel diver and see if something bad happened. 

 

Which exact configurations were you looking for?

Something like the below configuration would be nice. I started looking into the kubevirt  codebase to see if I can come up with a quick RFC patch(looks like it might take some time for me)

You can also define a hook-sidecar and inject your changes directly. Here an example: https://github.com/kubevirt/kubevirt/tree/master/cmd/example-hook-sidecar
 

[nirmoy das]

Ah cool, hook-sidecar should work too. 

Thanks, Roman!

[Fabian Deutsch]

On Mon, Apr 12, 2021 at 12:01 PM nirmoy das <nirmoy...@gmail.com> wrote:

Hi Roman, 

Thanks for your reply. 

I am working on creating CI jobs to test kernel GPU drivers with kubevirt on Kubernetes and Zuul. Hence I was 

wondering if there is a way to change video hw in kubevirt.

Good to see you doing this! :)

In general we try to stay opinionated with KubeVirt in order to avoid to increase (the already high) complexity of our API.

Thus while I understand that this is helping your use-case, I would still say that this is not something that a regular ("the vast 80%") would need to do - changing the virtual video drivers.

Thus your feedback on the side car - or patches to simplify their use - would be welcome

 

Regards,

Nirmoy

On Mon, 12 Apr 2021 at 10:46, Roman Mohr <rm...@redhat.com> wrote:

Hi,

On Tue, Apr 6, 2021 at 2:00 PM Nirmoy <nirmoy...@gmail.com> wrote:

So I have looked into [1] but couldn't figure out a way to change video driver in the VM.

Is there a way to have different video driver than qxl ? 

No, that is not possible. We add a very low-res vga card to the VM for admin-access purposes via VNC.

What would you need?

Best regards,

Roman

 

[1] https://kubevirt.io/api-reference/master/definitions.html

Regards,

Nirmoy

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