NixOS-Config/hosts/JimDesktop/hardware-configuration.nix

{ config, lib, pkgs, outputs, modulesPath, ... }: let
  # Set common boot paramaters
  commonKernelParams = [
    # Nvidia settings
    "nvidia_drm.fbdev=1"
    "nouveau.config=NvGspRm=1"

    # VM/GPU passthrough
    "amd_iommu=on"
    "iommu=pt"
    "nested=1"

    # Virtualization nonsense
    "transparent_hugepage=never"

    # Isolate devices into IOMMU groups
    "pcie_acs_override=downstream,multifunction"
    "pci=routeirq"
  ];              
in {
  imports = [
    (modulesPath + "/installer/scan/not-detected.nix")
  ];

  # Set all boot options
  boot = {
    # Set a kernel version and load/blacklist drivers    
    kernelPackages = pkgs.unstable.linuxPackages_zen;    
    blacklistedKernelModules = [
      "pcspkr"
    ];               
    kernel.sysctl."vm.max_map_count" = 2147483642;       
    kernelParams = commonKernelParams ++ [
      "vfio-pci.ids=10de:1f82,10de:10fa"
    ];
    initrd = {
      availableKernelModules = [
        "nvme"
	"xhci_pci"
	"ahci"
	"usbhid"
	"usb_storage"
	"sd_mod"
      ];
      kernelModules = [
        "vfio"
	"vfio_pci"
	"vfio_iommu_type1"
	"kvm-amd"
      ];
    };
  };

  # Additional entry to boot from the second GPU
  specialisation = {
    gputwo.configuration = {
      boot.kernelParams = commonKernelParams ++ ["vfio-pci.ids=10de:2504,10de:228e"];
    };
  };

  # Mount everything as necessary
  fileSystems = {
    "/" = {
      device = "/dev/disk/by-uuid/f0786b07-8303-416f-87ff-276bfd696387";
      fsType = "bcachefs";
    };
    "/boot" = {
      device = "/dev/disk/by-uuid/EF6D-9009";
      fsType = "vfat";
    };
    "/etc/libvirt" = {
      device = "/dev/disk/by-label/Qemu";
      options = ["nosuid" "nodev" "nofail"];
    };
    "/var/lib/libvirt" = {
      depends = ["/etc/libvirt"];
      device = "/etc/libvirt/varlibvirt";
      options = ["bind" "rw"];
    };
    "/mnt/Linux1" = {
      device = "/dev/disk/by-label/Linux1";
      options = ["nosuid" "nodev" "nofail" "x-gvfs-show"];
    };
    "/mnt/Linux2" = {
      device = "/dev/disk/by-label/Linux2";
      options = ["nosuid" "nodev" "nofail" "x-gvfs-show"];
    };
    "/mnt/Windows1" = {
      device = "/dev/disk/by-label/Windows1";
      options = ["nosuid" "nodev" "noauto"];
    };
    "/mnt/Windows2" = {
      device = "/dev/disk/by-label/Windows2";
      options = ["nosuid" "nodev" "noauto"];
    };
    "/home/jimbo/JimboNFS" = {
      device = "${outputs.ips.server}:/export/JimboNFS";
      fsType = "nfs4";
      options = ["x-systemd.automount" "_netdev" "nofail" "noauto"];
    };
  };

  # Set the swap partition
  swapDevices = [
    {device = "/dev/disk/by-uuid/2e4c5120-716d-4cdc-84a0-c9e6391760db";}
  ];

  # Enables DHCP on each ethernet and wireless interface.
  networking.useDHCP = lib.mkDefault true;

  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
}