init

microvm.nix

@@ -0,0 +1,40 @@
+_: {
+
+  microvm = {
+    interfaces = [
+      {
+        type = "user";
+
+        # interface name on the host
+        id = "vm-a1";
+
+        # Ethernet address of the MicroVM's interface, not the host's
+        #
+        # Locally administered have one of 2/6/A/E in the second nibble.
+        mac = "02:00:00:00:00:01";
+      }
+    ];
+    volumes = [
+      {
+        mountPoint = "/var";
+        image = "var.img";
+        size = 256;
+      }
+    ];
+    shares = [
+      {
+        # use proto = "virtiofs" for MicroVMs that are started by systemd
+        proto = "9p";
+        tag = "ro-store";
+        # a host's /nix/store will be picked up so that no
+        # squashfs/erofs will be built for it.
+        source = "/nix/store";
+        mountPoint = "/nix/.ro-store";
+      }
+    ];
+
+    # "qemu" has 9p built-in!
+    hypervisor = "qemu";
+    socket = "control.socket";
+  };
+}