System/machines/levitation/passthrough.nix

{ config, lib, pkgs, ... }:
let
  gpuIDs = [
    # 2080 super
    "10de:1e81" # Graphics
    "10de:10f8" # Audio
    "10de:1ad8" # Usb ????
    "10de:1ad9" # Usb ????
  ];
in {
  boot = {
    kernelParams = [
      # enable iommu
      "amd_iommu=on"
      # Isolate the nvidia gpu
      ("vfio-pci.ids=" + lib.concatStringsSep "," gpuIDs)
    ];
    # Modules needed
    initrd.kernelModules = [ "vfio_pci" "vfio" "vfio_iommu_type1" ];
  };

  environment.systemPackages = with pkgs; [ looking-glass-client ];
  virtualisation.spiceUSBRedirection.enable = true;
  virtualisation.libvirtd = {
    qemu = {
      swtpm.enable = true;
      ovmf = {
        enable = true;
        packages = [ pkgs.OVMFFull.fd ];
      };
    };
  };
  systemd.tmpfiles.rules =
    [ "f /dev/shm/looking-glass 0660 nathan qemu-libvirtd -" ];

  ##
  ## Networking
  ##
  # Setup bridge 
  networking.bridges = { "qemu-br0" = { interfaces = [ "enp6s0" ]; }; };
  networking.interfaces.qemu-br0 = {
    ipv4.addresses = [{
      address = "10.0.0.247";
      prefixLength = 21;
    }];
  };
  networking.defaultGateway = "10.0.4.1";
  networking.nameservers = [ "10.0.0.10" ];
}