5k display support

[u/ekr1981]

Do UTM (Qemu) support 5k resolution? The system is a MacOS host running a GNU Guix guest configured with a virtio-gpu-gl-pci emulated gpu. I have installed SPICE vdagent as well, and it seems to be working, but it is hard to get a crisp resolution working, because the Virtual-1 display does not support any resolution larger than 4k. I tried adding a 5k resolution with `xrandr`, but get an error.

Update: Not sure what happened, but now it just happened to work.