NixOS-Config/hosts/firefly/system/hardware/default.nix

{ config, lib, pkgs, 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")
  ];

  boot = {
    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 = [
	"dm-snapshot"
        "vfio"
	"vfio_pci"
	"vfio_iommu_type1"
	"kvm-amd"
      ];

      # Encryption and TPM
      systemd.enable = true;
      luks.devices = {
        "crypt-ssd" = {
          device = "/dev/disk/by-uuid/52110c74-19b6-40ef-9710-e6c9b157005f";
          preLVM = true;
          allowDiscards = true;
        };
      };
    };
  };

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

  fileSystems = {
    "/" = {
      device = "/dev/disk/by-uuid/bbfed7d1-62f2-4d8e-b63f-7f6ec932105b";
      fsType = "btrfs";
      options = [ "subvol=@" "noatime" "nodiratime" "discard" ];
    };
    "/home" = {
      device = "/dev/disk/by-uuid/bbfed7d1-62f2-4d8e-b63f-7f6ec932105b";
      fsType = "btrfs";
      options = [ "subvol=@home" "noatime" "nodiratime" "discard" ];
    };
    "/nix" = {
      device = "/dev/disk/by-uuid/bbfed7d1-62f2-4d8e-b63f-7f6ec932105b";
      fsType = "btrfs";
      options = [ "subvol=@nix" "noatime" "nodiratime" "discard" ];
    };
    "/var" = {
      device = "/dev/disk/by-uuid/bbfed7d1-62f2-4d8e-b63f-7f6ec932105b";
      fsType = "btrfs";
      options = [ "subvol=@var" "noatime" "nodiratime" "discard" ];
    };
    "/.snapshots" = {
      device = "/dev/disk/by-uuid/bbfed7d1-62f2-4d8e-b63f-7f6ec932105b";
      fsType = "btrfs";
      options = [ "subvol=@snapshots" "noatime" "nodiratime" "discard" ];
    };
    "/boot" = {
      device = "/dev/disk/by-uuid/3B4A-76C9";
      fsType = "vfat";
      options = [ "fmask=0022" "dmask=0022" ];
    };

    # Games and such
    "/mnt/Linux1" = {
      device = "/dev/disk/by-uuid/b2901f8c-ffda-4b88-bb63-a9ea0c96ccb4";
      options = [ "nosuid" "nodev" "nofail" "x-gvfs-show" ];
    };
    "/mnt/Linux2" = {
      device = "/dev/disk/by-uuid/f08e4f38-162c-402f-ba2a-5925151b78bf";
      options = [ "nosuid" "nodev" "nofail" "x-gvfs-show" ];
    };
    "/mnt/Windows1" = {
      device = "/dev/disk/by-uuid/10BC97B2BC979138";
      options = [ "nosuid" "nodev" "noauto" ];
    };
    "/mnt/Windows2" = {
      device = "/dev/disk/by-uuid/0A5A3420237C863A";
      options = [ "nosuid" "nodev" "noauto" ];
    };

    # Miscellaneous mounts
    "/etc/libvirt" = {
      device = "/dev/disk/by-uuid/f18a0302-9914-471d-828c-85ab1a67a8be";
      options = [ "nosuid" "nodev" "nofail" ];
    };
    "/etc/libvirt/VMs/Bulk" = {
      depends = [ "/etc/libvirt" ];
      device = "/dev/disk/by-uuid/3eb36c3e-81ac-4281-89f0-c89242d88dd6";
      options = [ "nosuid" "nodev" "nofail" ];
    };
    "/var/lib/libvirt" = {
      depends = [ "/etc/libvirt" ];
      device = "/etc/libvirt/varlibvirt";
      options = [ "bind" "rw" ];
    };

    # Network mounts
    "/home/jimbo/JimboNFS" = {
      device = "${config.ips.server}:/export/JimboNFS";
      fsType = "nfs4";
      options = [ "x-systemd.automount" "_netdev" "nofail" "noauto" ];
    };
  };

  swapDevices = [
    { device = "/dev/disk/by-uuid/1a6a68d0-8ae7-4836-a585-b708597937a1"; }
  ];

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