1 files changed, 95 insertions, 0 deletions
diff --git a/os/vms/opnsense.nix b/os/vms/opnsense.nix
new file mode 100644
index 0000000..b9f2978
--- /dev/null
+++ b/os/vms/opnsense.nix
@@ -0,0 +1,95 @@
+{
+  config,
+  lib,
+  inputs,
+  ...
+}:
+let
+  cfg = config.os.srv.opnsense;
+  makePciArgs =
+    ids:
+    builtins.concatLists (
+      map (id: [
+        "-device"
+        "vfio-pci,host=${id},rombar=0"
+      ]) ids
+    );
+in
+{
+  imports = [ inputs.microvm.nixosModules.host ];
+
+  options.os.srv.opnsense = {
+    enable = lib.mkEnableOption "enables an opnsense microvm";
+
+    pciIDs = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      example = [
+        "03:00.0"
+        "03:00.1"
+      ];
+      description = "List of PCI bus addresses to pass through directly to OPNsense.";
+    };
+
+    vendorIDs = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      example = [ "8086:1563" ];
+      description = "List of Vendor:Device IDs to bind explicitly to the vfio-pci driver.";
+    };
+
+    imagePath = lib.mkOption {
+      type = lib.types.path;
+      default = /var/lib/microvm/images/opnsense.qcow2;
+      description = "Path to the OPNsense qcow2 drive image block.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    boot = {
+      kernelParams = [
+        "intel_iommu=on"
+        "iommu=pt"
+      ];
+      kernelModules = [
+        "vfio_pci"
+        "vfio"
+        "vfio_iommu_type1"
+      ];
+      extraModprobeConfig = ''
+        options vfio-pci ids=${lib.concatStringsSep "," (lib.unique cfg.vendorIDs)}
+      '';
+    };
+
+    microvm.vms.opnsense = {
+      autostart = true;
+      config = {
+        imports = [ inputs.microvm.nixosModules.microvm ];
+
+        networking.hostName = "opnsense";
+
+        microvm = {
+          vcpu = 4;
+          mem = 4096;
+          hypervisor = "qemu";
+
+          interfaces = [
+            {
+              type = "bridge";
+              id = "vtnet0";
+              bridge = "br-srv";
+            }
+          ];
+
+          qemu.extraArgs = [
+            "-machine"
+            "q35,accel=kvm,kernel-irqchip=on"
+            "-cpu"
+            "host,migratable=off,+invtsc"
+          ]
+          ++ (makePciArgs cfg.pciIDs);
+        };
+      };
+    };
+  };
+}