[libvirt] spice-gl bug: Failed to initialize EGL render node for SPICE GL

Hello, I am having issues with getting spice-gl to work properly with libvirt. There is a bugzilla report which describes the issue but until now there is still no solution (The patch didn't work on my system.) As I also mentioned there, I tried adding the `renderD128` device to `cgroup_device_acl` in the qemu.conf file but this produced different errors: qemu-system-x86_64: egl: eglGetDisplay failed qemu-system-x86_64: egl: EGL_KHR_surfaceless_context not supported qemu-system-x86_64: Failed to initialize EGL render node for SPICE GL Paul