feat: add virt manager

configuration.nix

@@ -122,7 +122,10 @@
   users.users.heroz = {
     shell = pkgs.nushell;
     isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
+    extraGroups = [
+      "wheel"
+      "libvirtd"
+    ]; # Enable ‘sudo’ for the user.
     packages = with pkgs; [
       gnomeExtensions.blur-my-shell
       gnomeExtensions.appindicator
@@ -137,6 +140,10 @@
     ];
   };
 
+  virtualisation.libvirtd.enable = true;
+  boot.kernelModules = [ "kvm-intel" ];
+  programs.virt-manager.enable = true;
+
   # List packages installed in system profile.
   # You can use https://search.nixos.org/ to find more packages (and options).
   # environment.systemPackages = with pkgs; [
@@ -162,6 +169,7 @@
   # networking.firewall.allowedUDPPorts = [ ... ];
   # Or disable the firewall altogether.
   # networking.firewall.enable = false;
+  networking.firewall.trustedInterfaces = [ "virbr0" ];
 
   # Copy the NixOS configuration file and link it from the resulting system
   # (/run/current-system/configuration.nix). This is useful in case you

virbr0.xml

@@ -0,0 +1,5 @@
+<network>
+  <name>virbr0</name>
+  <forward mode='bridge'/>
+  <bridge name='virbr0'/>
+</network>

vm-bridge-networking.md

@@ -0,0 +1,29 @@
+# Bridge networking
+
+Create a XML file called virbr0.xml with the definition of the bridge interface
+```xml
+<network>
+  <name>virbr0</name>
+  <forward mode='bridge'/>
+  <bridge name='virbr0'/>
+</network>
+```
+
+Add and enable bridge interface
+```sh
+virsh net-define virbr0.xml
+virsh net-start virbr0
+ip link add virbr0 type bridge
+ip address ad dev virbr0 10.25.0.1/24
+ip link set dev virbr0 up
+```
+
+Add a new network device to the vm :
+```xml
+<interface type='bridge'>
+  <mac address='52:54:00:12:34:56'/>
+  <source bridge='virbr0'/>
+  <model type='virtio'/>
+  <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
+</interface>
+```