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@ -2,7 +2,7 @@
title: Virtual Function I/O Mediated devices (vfio-mdev)
description: Create and Configure Virtual Function I/O Mediated devices (vfio-mdev)
published: true
date: 2025-03-31T14:19:04.753Z
date: 2025-03-31T14:23:33.608Z
tags:
editor: markdown
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:
```
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
```
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:
```
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:
```
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:
```
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
@ -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.
{.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
## Troubleshooting