update: fixed issues and update flake inputs

system/dev/dn-pre7780/virtualisation/kvm.nix

@@ -0,0 +1,24 @@
+{ config, pkgs, ... }:
+let
+  inherit (config.systemConf) username;
+in
+{
+  programs.virt-manager.enable = true;
+
+  users.groups.libvirtd.members = [ username ];
+
+  virtualisation = {
+    libvirtd = {
+      enable = true;
+      qemu.swtpm.enable = true;
+      qemu.vhostUserPackages = with pkgs; [ virtiofsd ];
+    };
+    spiceUSBRedirection.enable = true;
+  };
+
+  environment.systemPackages = with pkgs; [
+    # dnsmasq
+    qemu
+    quickemu
+  ];
+}