zram and swap

modules/nixos/common/base.nix

@@ -20,4 +20,6 @@
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
   system.stateVersion = "24.11";
+  zramSwap.enable = true;
+  swapDevices = [ { device = "/swapfile"; size = 16 * 1024; priority = -1; } ];
 }

modules/vms/haos-vm.nix

@@ -0,0 +1,101 @@
+
+# /home/death916/nixconfig/modules/vms/haos-vm.nix
+#
+# Declarative Home Assistant VM configuration using NixVirt.
+# This is the permanent, declarative solution to managing your VM.
+#
+# To use this, you must:
+# 1. Add NixVirt to your flake.nix inputs.
+#    inputs.nixvirt = {
+#      url = "github:NixOS/nixvirt";
+#      inputs.nixpkgs.follows = "nixpkgs";
+#    };
+# 2. Import this file and the nixvirt module in your main NixOS configuration:
+#    imports = [
+#      ./modules/vms/haos-vm.nix
+#      inputs.nixvirt.nixosModules.default # Provides the options below
+#    ];
+# 3. Remove the old `services.homeassistant-vm` block from your configuration.
+# 4. Ensure `virtualisation.libvirtd.qemu.ovmf.enable = true;` is set.
+
+{ config, pkgs, lib, ... }:
+
+let
+  # Parameters for your VM, taken from your existing configuration.
+  haosImagePath = "/var/lib/libvirt/images/haos.qcow2";
+  haosMemory = 6096; # In MiB, from your services.nix
+  haosVcpus = 4;    # From your services.nix
+  haosBridge = "br0";
+in
+{
+  # This defines the Libvirt domain (VM) using NixVirt's options.
+  # It assumes you are using the default libvirt connection.
+  virtualisation.libvirt.connections.default.domains = {
+    homeassistant = {
+      autostart = true;
+      # The domain configuration, which maps closely to Libvirt's XML structure.
+      domain = {
+        type = "kvm"; # Use KVM for hardware acceleration
+        name = "homeassistant";
+        memory = {
+          value = haosMemory;
+          unit = "MiB";
+        };
+        vcpu = {
+          placement = "static";
+          value = haosVcpus;
+        };
+
+        # OS boot configuration
+        os = {
+          type = {
+            arch = "x86_64";
+            machine = "pc-q35-8.0"; # Modern machine type, good default
+            value = "hvm";
+          };
+          # This ensures the VM boots with UEFI.
+          # The path is managed by NixOS when `ovmf.enable = true` is set.
+          loader = {
+            readonly = "yes";
+            type = "pflash";
+            path = "${pkgs.OVMF.fd}/FV/OVMF.fd";
+          };
+          # NVRAM storage for UEFI settings.
+          nvram.template = "${pkgs.OVMF.fd}/FV/OVMF_VARS.fd";
+          boot.dev = "hd";
+        };
+
+        # CPU configuration
+        cpu.mode = "host-passthrough";
+
+        # Devices configuration
+        devices = {
+          emulator = "${pkgs.qemu_kvm}/bin/qemu-system-x86_64";
+          disks = [{
+            type = "file";
+            device = "disk";
+            driver = {
+              name = "qemu";
+              type = "qcow2";
+            };
+            source.file = haosImagePath;
+            target = {
+              dev = "vda";
+              bus = "virtio";
+            };
+          }];
+          interfaces = [{
+            type = "bridge";
+            source.bridge = haosBridge;
+            model.type = "virtio";
+          }];
+          # Headless setup
+          consoles = [{ type = "pty"; }];
+          graphics = [{ type = "none"; }];
+          # Virtio balloon for memory management
+          memballoon.model = "virtio";
+        };
+      };
+    };
+  };
+}