init nix-os configuraion files

modules/nixos/virtualize/libvirtd/default.nix

@@ -0,0 +1,45 @@
+{ config, pkgs, lib, username, ... }:
+{
+
+  imports = [
+    ./hooks.nix
+  ];
+  
+  config = {
+
+    # Ref: https://nixos.wiki/wiki/NixOps/Virtualization
+
+    boot = {
+      kernelModules = [ "kvm-intel" "vfio" "vfio_iommu_type1" "vfio_pci" "vfio_virqfd" ];
+      kernelParams = [ "intel_iommu=on" "iommu=pt" ];
+      # extraModprobeConfig = "options vfio-pci ids=8086:1901,10de:1b81,10de:10f0";
+    };
+    virtualisation.libvirtd = {
+      enable = true;
+      qemu = {
+        package = pkgs.qemu_kvm;
+        ovmf.enable = true;
+        ovmf.packages = [ pkgs.OVMFFull.fd ];
+        swtpm.enable = true;
+        runAsRoot = false;
+      };
+    };
+
+    # tpm
+    security.tpm2 = {
+      pkcs11.enable = true; # expose /run/current-system/sw/lib/libtpm2_pkcs11.so
+      enable = true;
+      tctiEnvironment.enable = true; # TPM2TOOLS_TCTI and TPM2_PKCS11_TCTI env variables
+    };
+
+    # Ref: https://nixos.wiki/wiki/Virt-manager
+
+    environment.systemPackages = with pkgs; [
+      virt-manager
+      virglrenderer
+      #virt-manager-qt
+    ];
+
+    users.users.${username}.extraGroups = lib.mkIf config.virtualisation.libvirtd.enable [ "libvirtd" "tss" ];
+  };
+}