Rename some hostnames

hosts/tower/boot/default.nix

@@ -0,0 +1,64 @@
+{ config, pkgs, ... }:
+let
+  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 {
+  boot = {
+    # Must be unstable for newest NVIDIA drivers, must be Zen for IOMMU isolation
+    kernelPackages = pkgs.unstable.linuxPackages_zen;
+    kernel.sysctl."vm.max_map_count" = 2147483642;
+    kernelParams = commonKernelParams ++ [ "vfio-pci.ids=10de:1f82,10de:10fa" ];
+    blacklistedKernelModules = [ "pcspkr" ];
+
+    initrd.systemd = {
+      enable = true;
+      services.root-reset = {
+        description = "Reset root and snapshot last boot";
+        wantedBy = [ "initrd.target" ];
+        before = [ "sysroot.mount" ];
+        after = [ "dev-${config.networking.hostName}-root.device" ];
+        unitConfig.DefaultDependencies = "no";
+        serviceConfig.Type = "oneshot";
+        script = ''
+          mkdir -p /mnt
+          mount /dev/${config.networking.hostName}/root /mnt
+
+          if [[ -e /mnt/prev ]]; then
+            btrfs subvolume delete /mnt/prev
+          fi
+
+          btrfs subvolume snapshot /mnt/root /mnt/prev
+
+          btrfs subvolume list -o /mnt/root | cut -f9 -d' ' | while read subvolume; do
+            btrfs subvolume delete "/mnt/$subvolume"
+          done
+
+          btrfs subvolume delete /mnt/root
+          btrfs subvolume create /mnt/root
+
+          umount /mnt
+        '';
+      };
+    };
+  };
+
+  # Use second GPU on boot
+  specialisation.gputwo.configuration = {
+    boot.kernelParams = commonKernelParams ++ [ "vfio-pci.ids=10de:2504,10de:228e" ];
+  };
+}

hosts/tower/default.nix

@@ -0,0 +1,19 @@
+{ ... }:
+{
+  imports = [
+    ./boot
+    ./disko
+    ./firewall
+    ./hardware
+    ../../modules/system
+  ];
+
+  system.lanzaboote.enable = true;
+  system.wireless.enable = false;
+  system.video.nvidia.enable = true;
+  system.libvirtd.enable = true;
+
+  environment.sessionVariables.NIXOS_OZONE_WL = "1";
+
+  networking.hostName = "tower";
+}

hosts/tower/disko/default.nix

@@ -0,0 +1,97 @@
+{ disko, config, ... }:
+{
+  imports = [ disko.nixosModules.disko ];
+
+  disko.devices = {
+    disk = {
+      "${config.networking.hostName}" = {
+        type = "disk";
+        device = "/dev/nvme0n1";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              priority = 1;
+              size = "2G";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            luks = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "${config.networking.hostName}-disk";
+                settings.allowDiscards = true;
+                passwordFile = "/tmp/secret.key";
+                content = {
+                  type = "lvm_pv";
+                  vg = "${config.networking.hostName}";
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+
+    lvm_vg = {
+      "${config.networking.hostName}" = {
+        type = "lvm_vg";
+        lvs = {
+          root = {
+            size = "100%";
+            content = {
+              type = "btrfs";
+              extraArgs = [ "-f" ];
+              subvolumes = {
+                "/root" = {
+                  mountpoint = "/";
+                  mountOptions = [ "compress=zstd" "noatime" ];
+                };
+                "/prev" = {
+                  mountpoint = "/prev";
+                  mountOptions = [ "compress=zstd" "noatime" ];
+                };
+                "/nix" = {
+                  mountpoint = "/nix";
+                  mountOptions = [ "compress=zstd" "noatime" ];
+                };
+
+                # Impermanence
+                "/persist" = {
+                  mountpoint = "/persist";
+                  mountOptions = [ "compress=zstd" "noatime" ];
+                };
+                "/persist/.snapshots" = { };
+
+                "/jimbo" = {
+                  mountpoint = "/persist/home/jimbo";
+                  mountOptions = [ "compress=zstd" "noatime" ];
+                };
+                "/jimbo/.snapshots" = { };
+              };
+            };
+          };
+          swap = {
+            size = "8G";
+            content = {
+              type = "swap";
+              discardPolicy = "both";
+            };
+          };
+        };
+      };
+    };
+  };
+
+  # Needed for impermanence
+  fileSystems = {
+    "/persist".neededForBoot = true;
+    "/persist/home/jimbo".neededForBoot = true;
+  };
+}

hosts/tower/firewall/default.nix

@@ -0,0 +1,9 @@
+{ ... }:
+{
+  networking.firewall = {
+    allowedUDPPorts = [
+      27015 # Half-Life
+      7777 # Lethal Company
+    ];
+  };
+}

hosts/tower/hardware/default.nix

@@ -0,0 +1,67 @@
+{ config, lib, modulesPath, ... }:
+{
+  boot = {
+    initrd = {
+      availableKernelModules = [
+        "nvme"
+        "xhci_pci"
+        "ahci"
+        "usbhid"
+        "usb_storage"
+        "sd_mod"
+      ];
+      kernelModules = [
+        "dm-snapshot"
+        "vfio"
+        "vfio_pci"
+        "vfio_iommu_type1"
+        "kvm-amd"
+      ];
+    };
+  };
+
+  fileSystems = {
+    # 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/Linux3" = {
+      device = "/dev/disk/by-uuid/e7bc75bd-c371-4b28-b212-7be9b1fad339";
+      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" ];
+    };
+
+    # Bulk storage mounts
+    "/persist/var/lib/libvirt" = {
+      device = "/dev/disk/by-uuid/abf78669-de2a-4afa-8e62-604f4e4cb355";
+      options = [ "subvol=libvirt" "nosuid" "nodev" "nofail" ];
+    };
+    "/persist/home/jimbo/VMs" = {
+      device = "/dev/disk/by-uuid/abf78669-de2a-4afa-8e62-604f4e4cb355";
+      options = [ "subvol=images" "nosuid" "nodev" "nofail" ];
+    };
+
+    # Network mounts
+    "/home/jimbo/JimboNFS" = {
+      device = "${config.ips.server}:/export/JimboNFS";
+      fsType = "nfs4";
+      options = [ "x-systemd.automount" "_netdev" "nofail" "noauto" ];
+    };
+  };
+
+  networking.useDHCP = lib.mkDefault true;
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

hosts/tower/id_ed25519.pub

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIC2lMkUd+BbXITE5LTg94hEzmA6UKsIIbaf5YOjGoLzl