{
  flake-file.inputs = {
    nixos-vfio.url = "github:j-brn/nixos-vfio";
    nixos-vfio.inputs.nixpkgs.follows = "nixpkgs";
  };

  den.aspects = {
    kirakira = {
      nixos = 
        { inputs, config, pkgs, lib, ... }:
        {
          imports = [
            inputs.nixos-vfio.nixosModules.vfio
          ];

          virtualisation.libvirtd = {
            deviceACL = [
              "/dev/kvm"
              "/dev/kvmfr0"
              "/dev/kvmfr1"
              "/dev/kvmfr2"
              "/dev/shm/scream"
              "/dev/shm/looking-glass"
              "/dev/null"
              "/dev/full"
              "/dev/zero"
              "/dev/random"
              "/dev/urandom"
              "/dev/ptmx"
              "/dev/kvm"
              "/dev/kqemu"
              "/dev/rtc"
              "/dev/hpet"
              "/dev/vfio/vfio"
            ];
          };

          virtualisation.vfio = {
            enable = true;
            IOMMUType = "intel";
            devices = [ # run `lspci -nn` for check
              "1002:73df" # amd graphic card
              "8086:4682" # intel uhd
            ];
          };

          virtualisation.kvmfr = {
            enable = true;
            devices = lib.singleton {
              size = 128;
              permissions = {
                user = "kirbara"; #unsolved
                mode = "0777";
              };
            };
          };

          # boot.blacklistedKernelModules = [
          #  "amdgpu"
          #  "radeon"
          # ];

          environment.systemPackages = [
            pkgs.looking-glass-client
            pkgs.pciutils
          ];
        };
      };
    };
}