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LGUG2Z
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The port can only be tried on a Windows machine, through a NixOS virtual machine in WSL2, which the machines this history is built on do not have. What such a machine can do for a Plasma guest is not known until something runs there, and every guess about it is a risk for what comes next. wsl2-probe is that something: one command, nix run .#wsl2-probe, that answers in about two minutes what the guest needs to know and prints, for each answer that is not a yes, the exact change: the .wslconfig lines, the NixOS option, the PowerShell command. It checks the environment (WSL2, memory, disk, .wslconfig, Nix); KVM (/dev/kvm, its group, and a tiny guest booted under KVM and under TCG, with the same loop timed in both and on the machine itself, which must differ by several times); the display (a QEMU GTK window through WSLg for a few seconds, and whether you saw it); the GPU (/dev/dxg, the Windows driver libraries, the OpenGL renderer in four environments, and virtio-vga-gl with gl=on); the Windows side (interop, mstsc.exe, whether Windows reaches a port that WSL listens on); whether memory, cores and disk are enough for the real guest; and virtiofs, which the real guest uses for its /nix/store and every shared directory (/dev/fuse, virtiofsd as the user with the options of nixpkgs' runner, and a guest that mounts the host's /nix/store and a writable directory, reads, writes and compares). Each probe runs apart from the others, so one that fails leaves the rest alone, and the output ends in a block to paste back, which is also written to wsl2-probe-report.txt. The flake wraps the script with QEMU, virtiofsd, Mesa's eglinfo and glxinfo and socat from nixpkgs, and builds the guest, a kernel from the binary cache, the two modules of it that virtiofs needs and a static busybox initrd, as wsl2-probe-guest, so nothing is compiled on the machine. Two checks keep the script from rotting: wsl2-probe builds the wrapper, which runs ShellCheck over the script and over the guest's init, and wsl2-probe-dry-run runs --dry-run in the build sandbox, which has no KVM, no network and no display. docs/dev/wsl2-probe.md says what each check means and how to read it.