QEMU/VirGL
VirGL is a virtual 3D GPU for use inside QEMU virtual machines, that allows the guest operating system to use the capabilities of the host GPU to accelerate 3D rendering.
Host System
On host system app-emulation/qemu should be built with opengl and virgl USE flags.
When using app-emulation/virt-manager Video Device model should be set to Virtio with 3D acceleration box checked.
Spice should be used for Display with Listen type set to None and with OpenGL box checked.
If using virt-viewer with multiple displays the above may not work, instead you can try editing the machine XML either via the Virtmanager gui or by virsh edit and edit the graphics and video sections to include:
<graphics type='egl-headless'>
<gl rendernode='/dev/dri/renderD128'/>
</graphics>
<video>
<model type='virtio' heads='2' primary='yes'>
<acceleration accel3d='yes'/>
</model>
</video>
Replacing /dev/dri/renderD128 with the path to your video card. Also note that multiple heads only work when the guest is running Wayland.
Guest System
VirGL currently only works with Linux guests. Windows VirGL components for Virtio are work in progress and haven't been merged yet
Mesa VirGL driver should be installed on the Guest system.
On Gentoo this can be done by setting VIDEO_CARDS to "virgl" and ensuring that media-libs/mesa
was recompiled with this flag enabled.
To test that everything works properly, the glxinfo command from the x11-apps/mesa-progs package can be used.
An example of working output of glxinfo | grep 'OpenGL render' is:
OpenGL renderer string: virgl (Mesa Intel(R) Iris(R) Xe Graphics (RPL-P))
See also
- QEMU — a generic, open source hardware emulator and virtualization suite.