cyclone: Do not suspend at login screen

hosts/cyclone/configuration.nix

@@ -36,7 +36,11 @@
 
       # GNOME!
       desktopManager.gnome.enable = true;
-      displayManager.gdm.enable = true;
+      displayManager.gdm = {
+        # At the login screen, don't automatically fall asleep.
+        autoSuspend = false;
+        enable = true;
+      };
 
       # Nvidia driver support.
       videoDrivers = [ "nvidia" ];
@@ -82,10 +86,29 @@
     cpu.amd.updateMicrocode = true;
   };
 
+  # As recommended in https://nixos.wiki/wiki/Libvirt#Setup
+  virtualisation.libvirtd = {
+    enable = true;
+    qemu = {
+      package = pkgs.qemu_kvm;
+      runAsRoot = true;
+      swtpm.enable = true;
+      ovmf = {
+        enable = true;
+        packages = [
+          (pkgs.OVMF.override {
+            secureBoot = true;
+            tpmSupport = true;
+          }).fd
+        ];
+      };
+    };
+  };
+
   # Hey, world!
   users.users.spotlight = {
     isNormalUser = true;
-    extraGroups = [ "wheel" ];
+    extraGroups = [ "libvirtd" "wheel" ];
     openssh.authorizedKeys.keys = [
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPQQO+c8ygVzRt55Z9qekqItSjYiw381cFPOqX+vGAGT MacBook Air 2020 macOS"
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJ/gyX9b80oml6z3UGOxVMJk/NS8R5w9NEITJcKb0MnU MacBook Air 2020 NixOS"