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148 lines
2.9 KiB
Markdown
148 lines
2.9 KiB
Markdown
---
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title: Display
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description: How to access a virtual machine's display
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published: true
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date: 2022-08-24T23:45:25.923Z
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tags:
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editor: markdown
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dateCreated: 2022-07-31T09:22:05.854Z
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---
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# Display
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A virtual display can be attached to a virtual machine, letting a user see the content of it. It is a must-have for non-headless scenario.
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## Summary
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> *[Official ressource](https://libvirt.org/formatdomain.html#graphical-framebuffers) for `libvirt`-compatible displays, including various XML examples*
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>
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{.is-info}
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* *to-be done. Add table here*.
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## Specific displays
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### VNC
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* *to-be done*
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### Spice
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* *to-be done*
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### SDL
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The Simple DirectMedia Layer is a local-only low-latency display.
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> *SDL is currently only avalable with virtual machines created using the QEMU/KVM **User Session** mode*
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{.is-info}
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> *As of now, this method is not compatible with Wayland* {.is-info}
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> *Mouse grab does not currently work in SDL*
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{.is-warning}
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* The display resolution of your guest display should not exceed that of your physical screen.
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#### SELinux configuration
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By default, SELinux will block access to X Windows Server for the virtualization stack. An exception has to be set.
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* Set new rule
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```
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sudo setsebool -P virt_use_xserver 1
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```
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* Do some magic trick
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```
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sudo ausearch -c 'qemu-system-x86' --raw | audit2allow -M my-qemusystemx86
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k
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```
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* And another one
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```
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sudo semodule -X 300 -i my-qemusystemx86.pp
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```
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#### XML SDL example
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* Example of an XML SDL configuration, with OpenGL enabled. This example requires a 3D-capable graphic card to be attached to the guest computer, such as ``virtio-gpu`` or ``vfio-pci``.
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```
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<graphics type="sdl" display=":0.0">
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<gl enable="yes"/>
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</graphics>
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```
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> *You can identify your display using the following command: `echo $DISPLAY`*
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{.is-info}
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### D-Bus
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> *The D-Bus display is only available since version 7.4.0 of *`libvirt`**
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{.is-warning}
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[D-Bus](https://www.freedesktop.org/wiki/Software/dbus/) is a Desktop-oriented middleware that can be used to create a display for a virtual machine.
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> *[Detailed presentation](https://bootlin.com/pub/conferences/2016/meetup/dbus/josserand-dbus-meetup.pdf) on D-Bus*
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{.is-info}
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* Export and enable a video backend, add support for OpenGL and peer-to-peer connection:
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Does not display at the moment.
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SELinux needs to be disabled.
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```
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<graphics type="dbus"/>
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<p2p value="on"/>
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<gl enable="yes"/>
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</graphics>
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```
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It will look like that when launched:
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```
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<graphics type="dbus" address="unix:path=/run/user/1000/libvirt/qemu/run/dbus/8-user-d-bus-dbus.sock">
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<gl enable="yes" rendernode="/dev/dri/renderD128"/>
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</graphics>
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```
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* Export and enable an audio backend:
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```
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<graphics type="dbus">
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<audio id="1">
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</graphics>
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```
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### Xephyr
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* *to-be done*
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### WebRTC
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* *to-be done*
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### Looking Glass
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* *to-be done*
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### virtio-wayland
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* *to-be done*
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### egl-headless
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* *to-be done*
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