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Clean-up and add wayland-specific for SDL

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lukas 2023-05-29 16:55:47 +02:00
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virt/vm/display.md
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@ -12,28 +12,22 @@ dateCreated: 2022-07-31T09:22:05.854Z
A virtual display can be attached to a virtual machine. It is a must-have for non-headless scenarios.
## Summary
* *to-be done. Add table here*.
## Display types
### VNC
* *to-be done*
### Spice
* *to-be done*
### SDL display
The Simple DirectMedia Layer (SDL)-powered display is a local-only low-latency display.
The [Simple DirectMedia Layer](https://www.libsdl.org/) (SDL)-powered display is a local-only low-latency display.
> The SDL display is only avalable with virtual machines created using the QEMU/KVM **user Session** mode and **Xorg**.
> The SDL display is only avalable with virtual machines created using the QEMU/KVM **User Session**.
{.is-info}
#### SELinux configuration
> 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}
#### SELinux-related configuration
By default, SELinux will block access to X Windows Server for the virtualization stack. An exception has to be set.
@ -56,24 +50,32 @@ k
sudo semodule -X 300 -i my-qemusystemx86.pp
```
#### XML SDL example
#### SDL XML configuration
> Mouse grab does not currently work with the SDL display
{.is-warning}
* The default display can be identified using `echo $DISPLAY`.
> The display resolution of your guest display should not exceed that of your physical screen.
{.is-info}
```
$ echo $DISPLAY
:0
```
* 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.
The same applies to `xauth`. On Wayland, it would look like that.
```
$ echo $XAUTHORITY
/run/user/1000/.mutter-Xwaylandauth.ARIY51
```
* 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">
<graphics type="sdl" display=":0" xauth="/run/user/1000/.mutter-Xwaylandauth.ARIY51" fullscreen="yes">
<gl enable="yes"/>
</graphics>
```
> You can identify your display using the following command: `echo $DISPLAY`.
{.is-info}
> The fullscreen attribute is not honored at the moment
{.is-warning}
### D-Bus display
@ -102,32 +104,13 @@ It will look like that when launched:
</graphics>
```
### Xephyr
* *to-be done*
### WebRTC
* *to-be done*
### Looking Glass
* *to-be done*
### virtio-wayland
* *to-be done*
### egl-headless
* *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
* [Libmks](https://gitlab.gnome.org/chergert/libmks) provides a "Mouse, Keyboard, and Screen" to QEMU using the D-Bus device support in QEMU and GTK 4.
* [QEMU D-Bus display experiment](https://gitlab.com/marcandre.lureau/qemu-display/) is a WIP Rust crates to interact with a -display dbus QEMU
* [SDL graphics](https://fedoraproject.org/wiki/How_to_debug_Virtualization_problems#SDL_Graphics)
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