[GH-ISSUE #81] Feature-Request: Add virgl support #53

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opened 2026-02-27 15:57:09 +03:00 by kerem · 3 comments

kerem commented

2026-02-27 15:57:09 +03:00

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Originally created by @fabiohsouza on GitHub (Dec 28, 2015).
Original GitHub issue: https://github.com/retspen/webvirtcloud/issues/81

I tryed change to

<video>
    <model type='virtio' heads='1'>
        <acceleration accel3d='yes'/>
    </model
</video>

but an error message saying the video model 'virtio' is not supported.

I am using for tests:
Ubuntu 15.10 - Kernel 4.4-rc7 (host/guest)
QEMU 2.5
Mesa 11.2
libvirt 1.2.21

https://www.redhat.com/archives/libvir-list/2015-November/msg01245.html

Originally created by @fabiohsouza on GitHub (Dec 28, 2015). Original GitHub issue: https://github.com/retspen/webvirtcloud/issues/81 I tryed change to ``` <video> <model type='virtio' heads='1'> <acceleration accel3d='yes'/> </model </video> ``` but an error message saying the video model 'virtio' is not supported. I am using for tests: Ubuntu 15.10 - Kernel 4.4-rc7 (host/guest) QEMU 2.5 Mesa 11.2 libvirt 1.2.21 https://www.redhat.com/archives/libvir-list/2015-November/msg01245.html

kerem commented

2026-02-27 15:57:10 +03:00

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@savichev commented on GitHub (Dec 28, 2015):

Latest in git - libvirtd version 1.3.1.
I compile for deb for test

Worked!
Debian 8 (host/guest)
Kernel: 4.4.0-040400rc7-generic (host/guest)
QEMU 2.5 (host)
mesa-dev_11.2.0 (host/guest)
libdrm-dev_2.4.66 (host/guest)
libvirt-namespaces._1.3.1 (host)

@savichev commented on GitHub (Dec 28, 2015): Latest in git - libvirtd version 1.3.1. I compile for deb for test Worked! Debian 8 (host/guest) Kernel: 4.4.0-040400rc7-generic (host/guest) QEMU 2.5 (host) mesa-dev_11.2.0 (host/guest) libdrm-dev_2.4.66 (host/guest) libvirt-namespaces._1.3.1 (host) ![Image of Yaktocat](https://pp.vk.me/c630316/v630316041/12ff2/znNWSb9AfWw.jpg)

kerem commented

2026-02-27 15:57:10 +03:00

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@savichev commented on GitHub (Mar 24, 2016):

https://cgit.freedesktop.org/spice/spice/commit/?id=782c7508e28fdeee786cdcebffd22f772d7f09ec

GL acceleration (virgl)

OpenGL acceleration is currently local only (it has to go through a Unix socket)
and it needs guest support. It's currently limited to recent linux
distributions (for example up to date Fedora 23 + updated mesa packages from
https://copr.fedorainfracloud.org/coprs/kraxel/virgl/[copr:kraxel]).

Configuration

Using libvirt

You need to add a virtio-gpu video device to your virtual machine instead of QXL.
[source,xml]
<video>
   <model type='virtio' heads='1'>
     <acceleration accel3d='yes'/>
   </model>
 </video>
Then you need to enable OpenGL on your SPICE graphics node:
[source,xml]
<graphics type='spice' autoport='no'>
  <gl enable='yes'/>
</graphics>
You don't need any port/address as they won't be usable with GL.

Using QEMU

You need to add a virtio-gpu device on QEMU command line,
as well as enable GL with SPICE. port/tls-port/addr arguments
won't be used in this setup. You need to configure a Unix socket to
connect to the VM display.

[source,sh]
-device virtio-vga,virgl=on -spice gl=on,unix,addr=/run/user/1000/spice.sock

Connecting to the guest

Connecting to the guest when virgl is in use is slightly different
than usual

If libvirt is being used

[source,sh]
client$ virt-viewer -a $vmname

If a Unix socket has been set on QEMU command line

[source,sh]
client$ remote-viewer spice+unix:///run/user/1000/spice.sock

@savichev commented on GitHub (Mar 24, 2016): https://cgit.freedesktop.org/spice/spice/commit/?id=782c7508e28fdeee786cdcebffd22f772d7f09ec > # GL acceleration (virgl) > > OpenGL acceleration is currently **local only** (it has to go through a Unix socket) > and it needs guest support. It's currently limited to recent linux > distributions (for example up to date Fedora 23 + updated mesa packages from > https://copr.fedorainfracloud.org/coprs/kraxel/virgl/[copr:kraxel]). > > ## Configuration > > Using libvirt > > You need to add a virtio-gpu video device to your virtual machine instead of QXL. > [source,xml] > > ``` > <video> > <model type='virtio' heads='1'> > <acceleration accel3d='yes'/> > </model> > </video> > ``` > > Then you need to enable OpenGL on your SPICE graphics node: > [source,xml] > > ``` > <graphics type='spice' autoport='no'> > <gl enable='yes'/> > </graphics> > ``` > > **You don't need any port/address** as they won't be usable with GL. > > Using QEMU > > You need to add a virtio-gpu device on QEMU command line, > as well as enable GL with SPICE. port/tls-port/addr arguments > won't be used in this setup. You need to configure a Unix socket to > connect to the VM display. > > [source,sh] > `-device virtio-vga,virgl=on -spice gl=on,unix,addr=/run/user/1000/spice.sock` > > ## Connecting to the guest > > Connecting to the guest when virgl is in use is slightly different > than usual > > If libvirt is being used > > [source,sh] > `client$ virt-viewer -a $vmname` > > If a Unix socket has been set on QEMU command line > > [source,sh] > `client$ remote-viewer spice+unix:///run/user/1000/spice.sock`

kerem commented

2026-02-27 15:57:10 +03:00

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@zingmars commented on GitHub (Jun 6, 2018):

While enabling virgl works, it breaks the NoVNC viewer as it fails to properly connect to the socket for some reason (blank screen followed by "Unexpected close while ready").

@zingmars commented on GitHub (Jun 6, 2018): While enabling virgl works, it breaks the NoVNC viewer as it fails to properly connect to the socket for some reason (blank screen followed by "Unexpected close while ready").