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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: 2025-04-01T09:09:10.701Z date: 2025-04-01T09:12:12.326Z
tags: tags:
editor: markdown editor: markdown
dateCreated: 2022-07-21T21:10:41.046Z dateCreated: 2022-07-21T21:10:41.046Z
@ -24,9 +24,7 @@ Contrary to paravirtualized GPUs (e.g. *virtio-gpu*), vGPUs can use the same dri
* Make sure the GRUB has been updated after the first boot: * Make sure the GRUB has been updated after the first boot:
`# grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg` `# grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg`
## Procedure ## Create a virtual GPU
### Create a virtual GPU
List all available vGPUs types: List all available vGPUs types:
@ -54,7 +52,7 @@ $ mdevctl types
Description: low_gm_size: 64MB, high_gm_size: 384MB, fence: 4, resolution: 1024x768, weight: 2 Description: low_gm_size: 64MB, high_gm_size: 384MB, fence: 4, resolution: 1024x768, weight: 2
``` ```
> Allocating more memory to the GPU in the platform firmware may increase the number of vGPUs one can create. See [Troubleshooting](#troubleshooting) section below. > Allocating more memory to the GPU in the platform firmware may increase the number of vGPUs one can create. See [*Troubleshooting*](#troubleshooting) section below
{.is-info} {.is-info}
In the example above, the `i915-GVTg_V5_4` virtual type seems to offer the best trade-offs between the available resolution and the number of available instances. In the example above, the `i915-GVTg_V5_4` virtual type seems to offer the best trade-offs between the available resolution and the number of available instances.
@ -137,7 +135,7 @@ $ 7686131b-b229-4768-a02c-35d1dbed7c66 0000:00:02.0 i915-GVTg_V5_4 auto (active)
* Start the machine in headless mode. It is possible to connect to this machine over a console interface. * Start the machine in headless mode. It is possible to connect to this machine over a console interface.
### Add a display device ## Add a display device
- Add a Spice display device - Add a Spice display device
@ -176,7 +174,7 @@ $ 7686131b-b229-4768-a02c-35d1dbed7c66 0000:00:02.0 i915-GVTg_V5_4 auto (active)
> 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 > 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}
* Then starts the domain * Starts the domain
## Troubleshooting ## Troubleshooting