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docs: update virt/vm/display

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lukas 2023-05-20 20:59:56 +00:00
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virt/vm/display.md
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@ -2,7 +2,7 @@
title: Display
description: How to access a virtual machine's display
published: true
date: 2023-05-20T20:52:12.783Z
date: 2023-05-20T20:59:54.276Z
tags:
editor: markdown
dateCreated: 2022-07-31T09:22:05.854Z
@ -14,9 +14,6 @@ A virtual display can be attached to a virtual machine. It is a must-have for no
## Summary
> [Official ressource](https://libvirt.org/formatdomain.html#graphical-framebuffers) for libvirt-compatible displays, including various XML examples
{.is-info}
* *to-be done. Add table here*.
## Display types
@ -29,19 +26,12 @@ A virtual display can be attached to a virtual machine. It is a must-have for no
* *to-be done*
### SDL
### SDL display
The Simple DirectMedia Layer is a local-only low-latency display.
> *SDL is currently only avalable with virtual machines created using the QEMU/KVM **User Session** mode*
> SDL is currently only avalable with virtual machines created using the QEMU/KVM **user Session** mode and **Xorg**.
{.is-info}
> *As of now, this method is not compatible with Wayland* {.is-info}
> *Mouse grab does not currently work in SDL*
{.is-warning}
* The display resolution of your guest display should not exceed that of your physical screen.
The Simple DirectMedia Layer (SDL)-powered display is a local-only low-latency display.
#### SELinux configuration
@ -68,7 +58,13 @@ sudo semodule -X 300 -i my-qemusystemx86.pp
#### XML SDL example
* 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``.
> Mouse grab does not currently work with the SDL display
{.is-warning}
> The display resolution of your guest display should not exceed that of your physical screen.
{.is-info}
* 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.
```
<graphics type="sdl" display=":0" xauth="/root/.Xauthority" fullscreen="yes">
@ -76,18 +72,13 @@ sudo semodule -X 300 -i my-qemusystemx86.pp
</graphics>
```
> *You can identify your display using the following command: `echo $DISPLAY`*
> You can identify your display using the following command: `echo $DISPLAY`.
{.is-info}
### D-Bus
### D-Bus display
> *The D-Bus display is only available since version 7.4.0 of *`libvirt`**
{.is-warning}
[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.
[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.
> *[Detailed presentation](https://bootlin.com/pub/conferences/2016/meetup/dbus/josserand-dbus-meetup.pdf) on D-Bus*
{.is-info}
* Export and enable a video backend, add support for OpenGL and peer-to-peer connection:
@ -139,5 +130,8 @@ It will look like that when launched:
* *to-be done*
## Resources
* [Detailed presentation](https://bootlin.com/pub/conferences/2016/meetup/dbus/josserand-dbus-meetup.pdf) on D-Bus
* [Official resource](https://libvirt.org/formatdomain.html#graphical-framebuffers) for libvirt-compatible displays, including various XML examples