{
  config,
  pkgs,
  # lib,
  # fleetFlake,
  ...
}: {
  security.polkit.enable = true;
  virtualisation.libvirtd.enable = true;

  networking.firewall.interfaces."wg0" = {
    allowedTCPPorts = [
      5900 # vnc by QEMU
      3389 # rdp installed in Windows itself
      47984
      47989
      48010 # sunshine/moonlight
      47990 # sunshine webui
    ];
    allowedUDPPortRanges = [
      {
        from = 47998;
        to = 48000;
      }
      {
        from = 48002;
        to = 48010;
      }
    ];
  };

  hardware.opengl.enable = true;
  virtualisation.spiceUSBRedirection.enable = true;

  boot = {
    initrd.kernelModules = [
      "vfio_pci"
      "vfio"
      "vfio_iommu_type1"
      "vfio_virqfd"

      # "i915"
    ];
  };

  boot.kernelParams = [
    "intel_iommu=on"
    "vfio-pci.ids=8086:4680"
    # "iommu=pt"
    "i915.enable_guc=3"
    "i915.max_vfs=7"
  ];

  # boot.blacklistedKernelModules = ["i915"];

  # boot.kernelModules = [
  #   # "vfio-pci"
  #   "i915"
  # ];

  # boot.extraModulePackages = [
  #   (config.boot.kernelPackages.callPackage ./i915-sriov-dkms.nix {} )
  # ];

  boot.initrd.availableKernelModules = [
    # "i915"
  ];

  # boot.initrd.kernelModules = [
  #   "i915"
  # ];

  # hardware = {
  #   firmware = [
  #     ((
  #         pkgs.runCommandNoCC
  #         "adls_dmc_ver2_01.bin"
  #         {}
  #         "mkdir -p $out/lib/firmware && cp ${./adls_dmc_ver2_01.bin} $out/lib/firmware/adls_dmc_ver2_01.bin"
  #       )
  #       // {
  #         # compressFirmware = false; # TODO can I re-enable compression?
  #       })
  #   ];
  # };

  # hardware.enableAllFirmware =
  #   builtins.trace "${
  #     (config.boot.kernelPackages.callPackage ./i915-sriov-dkms.nix {})
  #   }"
  #   true;

  # boot.kernelModul = ''
  # echo "vfio-pci" > /sys/bus/pci/devices/0000:00:02.0/driver_override
  # echo 7 > /sys/devices/pci0000:00/0000:00:02.0/sriov_numvfs
  # modprobe -i vfio-pci
  # modprobe -i i915
  # '';

  boot.kernelPatches = [
    # {
    #   name = "i915";
    #   patch = null;
    #   extraStructuredConfig = {
    #     INTEL_MEI_PXP = lib.kernel.module;
    #     DRM_I915_PXP = lib.kernel.yes;
    #     PMIC_OPREGION = lib.kernel.yes;
    #   };
    # }
  ];

  boot.kernel.sysctl = {
    "devices/pci0000:00/0000:00:02.0/sriov_numvfs" = 7;
  };

  # -vnc :0 \
  # -audiodev alsa,id=snd0,out.try-poll=off -device ich9-intel-hda -device hda-output,audiodev=snd0 \
  # -device vfio-pci,host=00:02.0 \

  systemd.services.vm-mara = let
    start-vm = pkgs.writeShellApplication {
      name = "start-vm";
      runtimeInputs = with pkgs; [qemu];
      text = ''
        [ ! -f /var/lib/vm-mara/w10.qcow2 ] && \
          qemu-img create -f qcow2 /var/lib/vm-mara/w10.qcow2 50G

        qemu-system-x86_64 \
          -enable-kvm \
          -cpu host,kvm=off,hv-spinlocks=819,hv-vapic=on,hv-relaxed=on,hv-vendor-id="IrisXE" \
          -smp 4 \
          -m 8192 \
          -nic user,model=virtio-net-pci,hostfwd=tcp::3389-:3389,hostfwd=tcp::47989-:47989,hostfwd=tcp::47990-:47990,hostfwd=tcp::47984-:47984,hostfwd=tcp::48010-:48010,hostfwd=udp::47998-:47988,hostfwd=udp::47999-:47999,hostfwd=udp::48000-:48000,hostfwd=udp::48002-:48002,hostfwd=udp::48003-:48003,hostfwd=udp::48004-:48004,hostfwd=udp::48005-:48005,hostfwd=udp::48006-:48006,hostfwd=udp::48007-:48007,hostfwd=udp::48008-:48008,hostfwd=udp::48009-:48009,hostfwd=udp::48010-:48010 \
          -cdrom /var/lib/vm-mara/virtio-win.iso \
          -device nec-usb-xhci,id=usb,bus=pci.0,addr=0x4 \
          -device usb-tablet \
          -vnc :0 \
          -nographic \
          -vga none \
          -drive file=/var/lib/vm-mara/w10.qcow2 \
          -device vfio-pci,host=00:02.0,addr=03.0,x-vga=on,multifunction=on,romfile=${./adls_dmc_ver2_01.bin}
      '';
    };
  in {
    wantedBy = ["multi-user.target"];
    after = ["network.target"];
    serviceConfig = {
      ExecStart = "${start-vm}/bin/start-vm";
    };
  };
}