- enabled ssh x11 forwarding by default

- check if default bridge config exists
- fallback bridge network if default 192.168.122.0/24 is not usable
- moved libvirt check after help generation
- enabled nested virtualization by default

Helper.cs

@@ -10,7 +10,7 @@ public class Helper
   public static Process? ConnectViaSsh(string user, string ip)
   {
     var startInfo = new ProcessStartInfo("ssh");
-    startInfo.Arguments = $"-o StrictHostKeyChecking=off {user}@{ip}";
+    startInfo.Arguments = $"-Y -o StrictHostKeyChecking=off {user}@{ip}";
 
     return Process.Start(startInfo);
   }
@@ -33,23 +33,44 @@ public static bool CheckDefaultNetwork()
       .Select(info => info.Address)
       .Any();
 
-    if (defaultBridgeHasIp is true)
+    var bridgeFileExists = File.Exists("/etc/qemu/bridge.conf");
+
+    if (defaultBridgeHasIp is true && bridgeFileExists)
       return true;
 
     var script = "";
 
-    if (defaultBridge == null)
+    if (defaultBridge == null || !bridgeFileExists)
     {
-      AnsiConsole.MarkupLine("[red]Default network bridge: virbr0 not found. " +
+      AnsiConsole.MarkupLine("[red]Default network bridge: virbr0 missing configuration. " +
                              "Some distributions do not setup a bridge automatically.[/]");
 
-      if (AnsiConsole.Ask<string>("Do you want to create one now and allow VMs to use it? (y/N)", "N").ToLower() != "y")
+      var hasFreeNetwork = NetworkInterface.GetAllNetworkInterfaces()
+        .SelectMany(i => i.GetIPProperties().UnicastAddresses)
+        .Any(i => i.ToString()?.Contains("192.168.122.") is true);
+
+      var thirdOctet = hasFreeNetwork ? "122" : "22";
+
+      var bridgeName = $"virbr0";
+      var bridgeIp = $"192.168.{thirdOctet}.1";
+      var bridgeMask = "255.255.255.0";
+      var bridgeDhcpStart = $"192.168.{thirdOctet}.128";
+      var bridgeDhcpEnd = $"192.168.{thirdOctet}.254";
+
+      AnsiConsole.WriteLine("👉 The following default network can be created: ");
+      AnsiConsole.WriteLine($"Name: {bridgeName}");
+      AnsiConsole.WriteLine($"IP: {bridgeIp}");
+      AnsiConsole.WriteLine($"Mask: {bridgeMask}");
+      AnsiConsole.WriteLine();
+
+      if (AnsiConsole
+            .Ask<string>("Do you want to create it now and allow VMs to use it? (y/N)", "N")
+            .ToLower() != "y")
       {
         return false;
       }
 
-      AnsiConsole.WriteLine("👉 The following default network and bridge is going to be created: ");
-      AnsiConsole.WriteLine(Interop.DefaultNetworkDefiniton);
+      var bridgeXml = Interop.GenVirBridgeXml(bridgeName, bridgeIp, bridgeMask, bridgeDhcpStart, bridgeDhcpEnd);
 
       script = $"""
         if ! test -f /etc/qemu/bridge.conf; then
@@ -60,7 +81,7 @@ chmod u+s /usr/lib/qemu/qemu-bridge-helper
 
         if ! virsh --connect qemu:///system net-start default &> /dev/null; then
           virsh net-undefine default &> /dev/null
-          virsh --connect qemu:///system net-define <(echo \"{Interop.DefaultNetworkDefiniton}\") &> /dev/null
+          virsh --connect qemu:///system net-define <(echo \"{bridgeXml}\") &> /dev/null
           virsh --connect qemu:///system net-destroy default &> /dev/null
         fi
         virsh --connect qemu:///system net-start default &> /dev/null

Interop.cs

@@ -153,18 +153,21 @@ public static void DestroyVm(nint vmId, string vmName, string vmDir)
     }
   }
 
-  public static string DefaultNetworkDefiniton = """
+  public static string GenVirBridgeXml(string name, string ip, string mask, string dhcpStart, string dhcpEnd)
+  {
+    return $"""
     <network>
       <name>default</name>
-      <bridge name='virbr0'/>
+      <bridge name='{name}'/>
       <forward/>
-      <ip address='192.168.122.1' netmask='255.255.255.0'>
+      <ip address='{ip}' netmask='{mask}'>
         <dhcp>
-          <range start='192.168.122.128' end='192.168.122.254'/>
+          <range start='{dhcpStart}' end='{dhcpEnd}'/>
         </dhcp>
       </ip>
     </network>
     """;
+  }
 }
 
 public class LibvirtConnection : IDisposable

Program.cs

@@ -9,12 +9,6 @@
 using Spectre.Console;
 using VmChamp;
 
-if (!Interop.IsLibvirtInstalled())
-{
-  AnsiConsole.MarkupLine("[red]Libvirt not found.[/]");
-  return 1;
-}
-
 var appConfig = new AppConfig();
 Directory.CreateDirectory(appConfig.CacheDir);
 Directory.CreateDirectory(appConfig.DataDir);
@@ -84,4 +78,10 @@ compdef _VmChamp_zsh_complete vmchamp
   return 0;
 }
 
+if (!Interop.IsLibvirtInstalled())
+{
+  AnsiConsole.MarkupLine("[red]Libvirt not found.[/]");
+  return 1;
+}
+
 return await app.InvokeAsync(args);

RunCommand.cs

@@ -250,7 +250,7 @@ private string GenXml(string vmName, string diskImage, string initImage, double
           <apic/>
           <vmport state="off"/>
         </features>
-        <cpu mode="host-model" check="partial"/>
+        <cpu mode="host-passthrough" check="partial"/>
         <on_poweroff>destroy</on_poweroff>
         <on_reboot>restart</on_reboot>
         <on_crash>destroy</on_crash>