mirror of
https://github.com/PhyllomeOS/wiki.git
synced 2024-11-06 04:01:11 +00:00
148 lines
2.9 KiB
Markdown
148 lines
2.9 KiB
Markdown
---
|
|
title: Display
|
|
description: How to access a virtual machine's display
|
|
published: true
|
|
date: 2022-08-24T23:45:25.923Z
|
|
tags:
|
|
editor: markdown
|
|
dateCreated: 2022-07-31T09:22:05.854Z
|
|
---
|
|
|
|
# Display
|
|
|
|
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.
|
|
|
|
|
|
## 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*.
|
|
|
|
## Specific displays
|
|
|
|
### VNC
|
|
|
|
* *to-be done*
|
|
|
|
### Spice
|
|
|
|
* *to-be done*
|
|
|
|
### SDL
|
|
|
|
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*
|
|
{.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.
|
|
|
|
|
|
#### SELinux configuration
|
|
|
|
By default, SELinux will block access to X Windows Server for the virtualization stack. An exception has to be set.
|
|
|
|
* Set new rule
|
|
|
|
```
|
|
sudo setsebool -P virt_use_xserver 1
|
|
```
|
|
|
|
* Do some magic trick
|
|
|
|
```
|
|
sudo ausearch -c 'qemu-system-x86' --raw | audit2allow -M my-qemusystemx86
|
|
k
|
|
```
|
|
|
|
* And another one
|
|
|
|
```
|
|
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``.
|
|
|
|
```
|
|
<graphics type="sdl" display=":0.0">
|
|
<gl enable="yes"/>
|
|
</graphics>
|
|
```
|
|
|
|
> *You can identify your display using the following command: `echo $DISPLAY`*
|
|
{.is-info}
|
|
|
|
### D-Bus
|
|
|
|
> *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.
|
|
|
|
> *[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:
|
|
|
|
Does not display at the moment.
|
|
|
|
SELinux needs to be disabled.
|
|
|
|
```
|
|
<graphics type="dbus"/>
|
|
<p2p value="on"/>
|
|
<gl enable="yes"/>
|
|
</graphics>
|
|
```
|
|
|
|
It will look like that when launched:
|
|
|
|
```
|
|
<graphics type="dbus" address="unix:path=/run/user/1000/libvirt/qemu/run/dbus/8-user-d-bus-dbus.sock">
|
|
<gl enable="yes" rendernode="/dev/dri/renderD128"/>
|
|
</graphics>
|
|
```
|
|
|
|
|
|
* Export and enable an audio backend:
|
|
|
|
```
|
|
<graphics type="dbus">
|
|
<audio id="1">
|
|
</graphics>
|
|
```
|
|
|
|
|
|
### Xephyr
|
|
|
|
* *to-be done*
|
|
|
|
### WebRTC
|
|
|
|
* *to-be done*
|
|
|
|
### Looking Glass
|
|
|
|
* *to-be done*
|
|
|
|
### virtio-wayland
|
|
|
|
* *to-be done*
|
|
|
|
### egl-headless
|
|
|
|
* *to-be done*
|
|
|
|
|
|
|