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Generate Evdev

v1.0.1

Easily setup a virtual Keyboard-Video-Mouse (KVM) switch for Libvirt/QEMU Virtual Machines (VMs) or Guests. Press a macro (L-CTRL + R-CTRL) to switch between Host and Guest(s).

Download

Table of Contents

Contents

1. Why?

Switch device inputs between Host and Guest(s). Requires devices to remain connected to be seen and usable by Guests (similar to the limitations within the old PS/2 cable standard, unlike USB).

2. Related Projects

Project Codeberg GitHub
Deploy VFIO link link
Auto X.Org link link
Generate Evdev link link
Guest Machine Guide link link
Libvirt Hooks link link
Power State Virtual Machine Manager link link

3. Documentation

4. Host Requirements

4.1. Operating System

Linux.

4.2. Software

  • Libvirt
  • QEMU

4.3. Hardware

IOMMU is supported (by the CPU) and enabled in the motherboard firmware (BIOS or UEFI).

  • For AMD machines: AMD-Vi
  • For Intel machines:  VT-d
  • For ARM architectures: SMMU

5. Download

  • Download the Latest Release: Codeberg, GitHub

  • Download the .zip file:

    1. Viewing from the top of the repository's (current) webpage, click the drop-down icon:
      • ··· on Codeberg.
      • <> Code on GitHub.
    2. Click Download ZIP and save.
    3. Open the .zip file, then extract its contents.

  • Clone the repository:

    1. Open a Command Line Interface (CLI).
      • Open a console emulator (for Debian systems: Konsole).
      • Open a existing console: press CTRL + ALT + F2, F3, F4, F5, or F6.
        • To return to the desktop, press CTRL + ALT + F7.
        • F1 is reserved for debug output of the Linux kernel.
        • F7 is reserved for video output of the desktop environment.
        • F8 and above are unused.
    2. Change your directory to your home folder or anywhere safe:
      • cd ~
    3. Clone the repository:
      • git clone https://www.codeberg.org/portellam/libvirt-hooks
      • git clone https://www.github.com/portellam/libvirt-hooks

6. Usage

6.1. Verify Installer is Executable

  1. Open the CLI (see Download).

  2. Go to the directory of where the cloned/extracted repository folder is: cd name_of_parent_folder/libvirt-hooks/

  3. Make the installer script file executable: chmod +x installer.bash

    • Do not make any other script files executable. The installer will perform this action.
    • Do not make any non-script file executable. This is not necessary and potentially dangerous.

6.2. installer.bash

  • From within the project folder, execute: sudo bash installer.bash
  -h, --help       Print this help and exit.
  -U, --update     Update qemu.conf source file before install or uninstall.
  -i, --install    Install generate-evdev to system.
  -u, --uninstall  Uninstall generate-evdev from system.

6.3. generate-evdev

  • From any folder, execute: sudo bash generate-evdev
    • The CLI's shell (bash) should recognize that the script file is located in /usr/local/bin.
-h, --help                Print this help and exit.
    --dump-xml            Dump QEMU commandline (XML) output to file.
    --hugepages           Include Hugepages as device for Libvirt/QEMU.
    --output-event-paths  Output Event device paths only.
    --output-input-paths  Output Input device paths only.
    --restart-service     Restart Libvirtd system service after setup.
    --set-user            Sets user ownership of Libvirt Input devices to current user. Default is root.
    --undo-changes        Undo changes; restore file backups.

6.4. Input Macro to Switch Between Guests

To switch input devices between the Host machine and any running Guest, an input macro must be pressed. The default is L-CTRL + R-CTRL. This macro may be changed for each individual Guest in its XML configuration. You may review the Libvirt documentation to learn more.

7. Filenames and Pathnames Modified by Generate Evdev

7.1. System Files

  • /etc/libvirt/qemu.conf

7.2. Binaries and Files

  • /usr/local/bin/generate-evdev
  • /usr/local/etc/generate-evdev.d/

8. Contact

Did you encounter a bug? Do you need help? Please visit the Issues page (Codeberg, GitHub).

9. References

1.

PCI passthrough via OVMF. ArchWiki. Accessed June 14, 2024. https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF.

2.

VFIO - ‘Virtual Function I/O’ - The Linux Kernel Documentation. The linux kernel. Accessed June 14, 2024. https://www.kernel.org/doc/html/latest/driver-api/vfio.html.

3.

VFIO Discussion and Support. Reddit. Accessed June 14, 2024. https://www.reddit.com/r/VFIO/.

4.

XML Design Format. GitHub - libvirt/libvirt. Accessed June 18, 2024. https://github.com/libvirt/libvirt/blob/master/docs/formatdomain.rst.

5.

XML Design Format: Input Devices. GitHub - libvirt/libvirt.Accessed June 18, 2024. https://github.com/libvirt/libvirt/blob/master/docs/formatdomain.rst.