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Enabling 3D acceleration with virgl

To enable 3D acceleration using virgl you need to make sure the virgl render is installed on the host through whatever your package manager is, then edit the libvirt XML to include the following:

    <graphics type='spice'>
      <listen type='none'/>
      <!-- these are optional -->
      <image compression='auto_glz'/>
      <jpeg compression='auto'/>
      <zlib compression='auto'/>
      <playback compression='on'/>
      <streaming mode='off'/>
      <clipboard copypaste='no'/>
      <!-- end optional -->
    </graphics>
    <graphics type='egl-headless'>
        <!-- change this to your video card device path -->
      <gl rendernode='/dev/dri/renderD128'/>
    </graphics>
    <video>
      <model type='virtio' heads='2' primary='yes'>
        <acceleration accel3d='yes'/>
      </model>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
    </video>

Then in the client make sure the spice-vdagent is installed and running and that the mesa driver is installed with virgl support, you can check it works with glxinfo | grep -i virgl if it outputs something it's working.

Note that heads=2 only works with wayland guests, x11 guests have odd behaviour where the screen mirrors.