Add simple VM

hosts/qemu/boot/default.nix

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+{ pkgs, ... }:
+{
+  boot = {
+    kernelPackages = pkgs.linuxPackages_latest;
+    loader.grub = {
+      enable = true;
+      device = "/dev/vda";
+    };
+  };
+}

hosts/qemu/default.nix

@@ -0,0 +1,13 @@
+{ config, lib, ... }:
+{
+  imports = [
+    ./boot
+    ./disko
+    ./hardware
+    ./users
+    ../../modules/system
+  ];
+
+  networking.hostName = "qemu";
+  system.stateVersion = "24.11";
+}

hosts/qemu/disko/default.nix

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+{ config, disko, ... }:
+{
+  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" "ssd" ];
+                };
+                "/prev" = {
+                  mountpoint = "/prev";
+                  mountOptions = [ "compress=zstd" "noatime" "ssd" ];
+                };
+                "/nix" = {
+                  mountpoint = "/nix";
+                  mountOptions = [ "compress=zstd" "noatime" "ssd" ];
+                };
+
+	        # Impermanence
+	        "/persist" = {
+	          mountpoint = "/persist";
+	          mountOptions = [ "compress=zstd" "noatime" "ssd" ];
+	        };
+                "/persist/.snapshots" = { };
+                "/persist/home" = { };
+                "/persist/home/.snapshots" = { };
+              };
+            };
+          };
+          swap = {
+            size = "4G";
+            content = {
+              type = "swap";
+              discardPolicy = "both";
+            };
+          };
+        };
+      };
+    };
+  };
+
+  # Needed for impermanence
+  fileSystems."/persist".neededForBoot = true;
+}

hosts/qemu/hardware/default.nix

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+{ config, lib, modulesPath, ... }:
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+    (modulesPath + "/virtualisation/qemu-vm.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "sr_mod" ];
+  boot.initrd.kernelModules = [ "dm-snapshot" ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

hosts/qemu/id_ed25519.pub

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+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAb+aqIyTDcXDH8vMK697zQnYYUjgbUD2tJyknlztE3j

hosts/qemu/users/default.nix

@@ -0,0 +1,4 @@
+{ ... }:
+{
+  imports = [ ./main ];
+}

hosts/qemu/users/main/default.nix

@@ -0,0 +1,6 @@
+{ config, lib, ... }:
+{
+  home-manager.users."${config.sysusers.main}".home = {
+    stateVersion = lib.mkForce config.system.stateVersion;
+  };
+}