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title: Share an input device with a guest using evdev title: Share an input device with a guest using evdev
description: description:
published: true published: true
date: 2023-05-13T15:14:05.325Z date: 2023-05-13T15:56:21.915Z
tags: tags:
editor: markdown editor: markdown
dateCreated: 2022-08-13T00:26:02.801Z dateCreated: 2022-08-13T00:26:02.801Z
@ -12,36 +12,46 @@ dateCreated: 2022-08-13T00:26:02.801Z
In this section, we focus on sharing a locally attached input device with a guest virtual machine. In this section, we focus on sharing a locally attached input device with a guest virtual machine.
## Event device ## Evdev event device
Libvirt offers a low-latency way to share an input device with a local virtual machine, using the [Linux evdev event interface](https://www.kernel.org/doc/html/latest/input/input.html?highlight=evdev#evdev). Since version 7.4.0, Libvirt added a low-latency local-only way to share an input device with a guest, using the [Linux evdev event interface](https://www.kernel.org/doc/html/latest/input/input.html?highlight=evdev#evdev).
The following is an XML snippet example for sharing a mouse and a keyboard. - List input devices based on their identification, only listing those with an *event* in their name and excluding these with *if*: `ls /dev/input/by-id/* | grep event | grep -v if`
``` ```
<input type='evdev'> /dev/input/by-id/usb-Corsair_CORSAIR_HARPOON_RGB_PRO_Gaming_Mouse_1902B02BAF5E04655DEB612AF5001C05-event-mouse
<source dev='/dev/input/by-path/platform-i8042-serio-1-event-mouse/'> /dev/input/by-id/usb-Logitech_G513_RGB_MECHANICAL_GAMING_KEYBOARD_156930783132-event-kbd
</input> /dev/input/by-id/usb-Logitech_USB_Keyboard-event-kbd
<input type='evdev'> /dev/input/by-id/usb-Logitech_USB_Optical_Mouse-event-mouse
<source dev='/dev/input/by-path/platform-i8042-serio-0-event-kbd' grab='all' repeat='on'/>
</input>
``` ```
Replace the `platform-i8042-serio-1-event-mouse` value with the value under `/dev/input/by-path/*` or `/dev/input/by-id/*` - Before attempting to share a device, make sure that the correct one is selected by registering its inputs in the console:
If there are multiple possible options, the input device has to have `event` in the name.
``` ```
# cat /dev/input/by-path/pci-0000:09:00.0-event-mouse cat /dev/input/by-id/usb-Logitech_G513_RGB_MECHANICAL_GAMING_KEYBOARD_156930783132-event-kbd
``` ```
- Clicking or typing on the device you wish to share should display gibberish characters on the screen:
``` ```
<EFBFBD><EFBFBD>c $ <EFBFBD><EFBFBD>c $
<EFBFBD><EFBFBD>c<EFBFBD><EFBFBD><EFBFBD>c<EFBFBD><EFBFBD><EFBFBD>c<EFBFBD>$<24><>c<EFBFBD>$<24><>c׏<63><D78F>c׏<63><D78F>c <EFBFBD><EFBFBD>c<EFBFBD><EFBFBD><EFBFBD>c<EFBFBD><EFBFBD><EFBFBD>c<EFBFBD>$<24><>c<EFBFBD>$<24><>c׏<63><D78F>c׏<63><D78F>c
``` ```
## Virtio-input - Add the following snippet to the XML domain definition of an existing virtual machine, inside the `<device>` section:
> Input grabbing on Wayland doesn't currently work as expected using Spice or VNC. Destkop environments based on the X session manager may work better. ```
{.is-warning} <input type='evdev'>
<source dev='/dev/input/by-id/usb-Logitech_G513_RGB_MECHANICAL_GAMING_KEYBOARD_156930783132-event-kbd' grab='all' repeat='on'/>
</input>
```
- Then start the machine!
Press <kbd>Left Ctrl + Right Ctrl</kbd> simultaneously to switch your device between
## Resources
* https://libvirt.org/formatdomain.html#input-devices