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@ -2,7 +2,7 @@
title: Virtual Function I/O Mediated devices (vfio-mdev) title: Virtual Function I/O Mediated devices (vfio-mdev)
description: Create and Configure Virtual Function I/O Mediated devices (vfio-mdev) description: Create and Configure Virtual Function I/O Mediated devices (vfio-mdev)
published: true published: true
date: 2025-03-31T14:19:04.753Z date: 2025-03-31T14:23:33.608Z
tags: tags:
editor: markdown editor: markdown
dateCreated: 2022-07-21T21:10:41.046Z dateCreated: 2022-07-21T21:10:41.046Z
@ -61,39 +61,57 @@ In the example above, the `i915-GVTg_V5_4` virtual type seems to offer the best
* Generate a universally unique identifier (UUID) with the following command: * Generate a universally unique identifier (UUID) with the following command:
``` ```
uuidgen $ uuidgen
``` ```
``` ```
7686131b-b229-4768-a02c-35d1dbed7c66 $ 7686131b-b229-4768-a02c-35d1dbed7c66
``` ```
* Start a vGPU based on the kind `i915-GVTg_V5_4` using the previously generated UUID * Start a vGPU based on the kind `i915-GVTg_V5_4` using the previously generated UUID
``` ```
sudo mdevctl start -u 7686131b-b229-4768-a02c-35d1dbed7c66 -p 0000:00:02.0 --type i915-GVTg_V5_4 # mdevctl start -u 7686131b-b229-4768-a02c-35d1dbed7c66 -p 0000:00:02.0 --type i915-GVTg_V5_4
``` ```
* Define, or make this vGPU permanent: * Define, or make this vGPU permanent:
``` ```
sudo mdevctl define -u 7686131b-b229-4768-a02c-35d1dbed7c66 # mdevctl define -u 7686131b-b229-4768-a02c-35d1dbed7c66
``` ```
* Set the vGPU to auto-start after the host boots up: * Set the vGPU to auto-start after the host boots up:
``` ```
sudo mdevctl modify -u 7686131b-b229-4768-a02c-35d1dbed7c66 --auto # mdevctl modify -u 7686131b-b229-4768-a02c-35d1dbed7c66 --auto
``` ```
* Finally, verify that the vGPU has successfully been created and is set to auto-start: * Finally, verify that the vGPU has successfully been created and is set to auto-start:
``` ```
mdevctl list -d $ mdevctl list -d
``` ```
``` ```
7686131b-b229-4768-a02c-35d1dbed7c66 0000:00:02.0 i915-GVTg_V5_4 auto (active) $ 7686131b-b229-4768-a02c-35d1dbed7c66 0000:00:02.0 i915-GVTg_V5_4 auto (active)
```
### Remove any video device or display devices
* Remove any video device such as `virtio-gpu` and set the last one to the `none`.
```
<domain type="kvm">
[...]
<device>
[...]
<video>
<model type="none"/>
</video>
[...]
</device>
[...]
</domain>
``` ```
### Assign a vGPU to a virtual machine ### Assign a vGPU to a virtual machine
@ -120,24 +138,6 @@ mdevctl list -d
> Notice that the RAMFB is set to on, which activates Drect Memory Access Buffers (DMA-BUFs), making the output of a virtual monitor available before the guest operating system takes over. > Notice that the RAMFB is set to on, which activates Drect Memory Access Buffers (DMA-BUFs), making the output of a virtual monitor available before the guest operating system takes over.
{.is-info} {.is-info}
## Remove any video device or display devices
* Remove any video device such as `virtio-gpu` and set the last one to the `none`.
```
<domain type="kvm">
[...]
<device>
[...]
<video>
<model type="none"/>
</video>
[...]
</device>
[...]
</domain>
```
* Then starts the domain * Then starts the domain
## Troubleshooting ## Troubleshooting