diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
index a29099f6f1..a926211da8 100755
--- a/tests/vm/basevm.py
+++ b/tests/vm/basevm.py
@@ -346,6 +346,46 @@ class BaseVM(object):
     def qmp(self, *args, **kwargs):
         return self._guest.qmp(*args, **kwargs)
 
+    def gen_cloud_init_iso(self):
+        cidir = self._tmpdir
+        mdata = open(os.path.join(cidir, "meta-data"), "w")
+        name = self.name.replace(".","-")
+        mdata.writelines(["instance-id: {}-vm-0\n".format(name),
+                          "local-hostname: {}-guest\n".format(name)])
+        mdata.close()
+        udata = open(os.path.join(cidir, "user-data"), "w")
+        print("guest user:pw {}:{}".format(self._config['guest_user'],
+                                           self._config['guest_pass']))
+        udata.writelines(["#cloud-config\n",
+                          "chpasswd:\n",
+                          "  list: |\n",
+                          "    root:%s\n" % self._config['root_pass'],
+                          "    %s:%s\n" % (self._config['guest_user'],
+                                           self._config['guest_pass']),
+                          "  expire: False\n",
+                          "users:\n",
+                          "  - name: %s\n" % self._config['guest_user'],
+                          "    sudo: ALL=(ALL) NOPASSWD:ALL\n",
+                          "    ssh-authorized-keys:\n",
+                          "    - %s\n" % self._config['ssh_pub_key'],
+                          "  - name: root\n",
+                          "    ssh-authorized-keys:\n",
+                          "    - %s\n" % self._config['ssh_pub_key'],
+                          "locale: en_US.UTF-8\n"])
+        proxy = os.environ.get("http_proxy")
+        if not proxy is None:
+            udata.writelines(["apt:\n",
+                              "  proxy: %s" % proxy])
+        udata.close()
+        subprocess.check_call(["genisoimage", "-output", "cloud-init.iso",
+                               "-volid", "cidata", "-joliet", "-rock",
+                               "user-data", "meta-data"],
+                               cwd=cidir,
+                               stdin=self._devnull, stdout=self._stdout,
+                               stderr=self._stdout)
+
+        return os.path.join(cidir, "cloud-init.iso")
+
 def parse_args(vmcls):
 
     def get_default_jobs():
diff --git a/tests/vm/centos b/tests/vm/centos
index f2f0befd84..c108bd6799 100755
--- a/tests/vm/centos
+++ b/tests/vm/centos
@@ -31,37 +31,6 @@ class CentosVM(basevm.BaseVM):
         make docker-test-mingw@fedora  {verbose} J={jobs} NETWORK=1;
     """
 
-    def _gen_cloud_init_iso(self):
-        cidir = self._tmpdir
-        mdata = open(os.path.join(cidir, "meta-data"), "w")
-        mdata.writelines(["instance-id: centos-vm-0\n",
-                          "local-hostname: centos-guest\n"])
-        mdata.close()
-        udata = open(os.path.join(cidir, "user-data"), "w")
-        udata.writelines(["#cloud-config\n",
-                          "chpasswd:\n",
-                          "  list: |\n",
-                          "    root:%s\n" % self.ROOT_PASS,
-                          "    %s:%s\n" % (self.GUEST_USER, self.GUEST_PASS),
-                          "  expire: False\n",
-                          "users:\n",
-                          "  - name: %s\n" % self.GUEST_USER,
-                          "    sudo: ALL=(ALL) NOPASSWD:ALL\n",
-                          "    ssh-authorized-keys:\n",
-                          "    - %s\n" % basevm.SSH_PUB_KEY,
-                          "  - name: root\n",
-                          "    ssh-authorized-keys:\n",
-                          "    - %s\n" % basevm.SSH_PUB_KEY,
-                          "locale: en_US.UTF-8\n"])
-        udata.close()
-        subprocess.check_call(["genisoimage", "-output", "cloud-init.iso",
-                               "-volid", "cidata", "-joliet", "-rock",
-                               "user-data", "meta-data"],
-                               cwd=cidir,
-                               stdin=self._devnull, stdout=self._stdout,
-                               stderr=self._stdout)
-        return os.path.join(cidir, "cloud-init.iso")
-
     def build_image(self, img):
         cimg = self._download_with_cache("https://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud-1802.qcow2.xz")
         img_tmp = img + ".tmp"
@@ -69,7 +38,7 @@ class CentosVM(basevm.BaseVM):
         subprocess.check_call(["ln", "-f", cimg, img_tmp + ".xz"])
         subprocess.check_call(["xz", "--keep", "-dvf", img_tmp + ".xz"])
         self.exec_qemu_img("resize", img_tmp, "50G")
-        self.boot(img_tmp, extra_args = ["-cdrom", self._gen_cloud_init_iso()])
+        self.boot(img_tmp, extra_args = ["-cdrom", self.gen_cloud_init_iso()])
         self.wait_ssh()
         self.ssh_root_check("touch /etc/cloud/cloud-init.disabled")
         self.ssh_root_check("yum update -y")
diff --git a/tests/vm/ubuntu.i386 b/tests/vm/ubuntu.i386
index 3834cd7a8d..7df54ae094 100755
--- a/tests/vm/ubuntu.i386
+++ b/tests/vm/ubuntu.i386
@@ -29,41 +29,6 @@ class UbuntuX86VM(basevm.BaseVM):
         make --output-sync {target} -j{jobs} {verbose};
     """
 
-    def _gen_cloud_init_iso(self):
-        cidir = self._tmpdir
-        mdata = open(os.path.join(cidir, "meta-data"), "w")
-        mdata.writelines(["instance-id: ubuntu-vm-0\n",
-                          "local-hostname: ubuntu-guest\n"])
-        mdata.close()
-        udata = open(os.path.join(cidir, "user-data"), "w")
-        udata.writelines(["#cloud-config\n",
-                          "chpasswd:\n",
-                          "  list: |\n",
-                          "    root:%s\n" % self.ROOT_PASS,
-                          "    %s:%s\n" % (self.GUEST_USER, self.GUEST_PASS),
-                          "  expire: False\n",
-                          "users:\n",
-                          "  - name: %s\n" % self.GUEST_USER,
-                          "    sudo: ALL=(ALL) NOPASSWD:ALL\n",
-                          "    ssh-authorized-keys:\n",
-                          "    - %s\n" % basevm.SSH_PUB_KEY,
-                          "  - name: root\n",
-                          "    ssh-authorized-keys:\n",
-                          "    - %s\n" % basevm.SSH_PUB_KEY,
-                          "locale: en_US.UTF-8\n"])
-        proxy = os.environ.get("http_proxy")
-        if not proxy is None:
-            udata.writelines(["apt:\n",
-                              "  proxy: %s" % proxy])
-        udata.close()
-        subprocess.check_call(["genisoimage", "-output", "cloud-init.iso",
-                               "-volid", "cidata", "-joliet", "-rock",
-                               "user-data", "meta-data"],
-                               cwd=cidir,
-                               stdin=self._devnull, stdout=self._stdout,
-                               stderr=self._stdout)
-        return os.path.join(cidir, "cloud-init.iso")
-
     def build_image(self, img):
         cimg = self._download_with_cache(
             "https://cloud-images.ubuntu.com/releases/bionic/release-20191114/ubuntu-18.04-server-cloudimg-i386.img",
@@ -71,7 +36,7 @@ class UbuntuX86VM(basevm.BaseVM):
         img_tmp = img + ".tmp"
         subprocess.check_call(["cp", "-f", cimg, img_tmp])
         self.exec_qemu_img("resize", img_tmp, "50G")
-        self.boot(img_tmp, extra_args = ["-cdrom", self._gen_cloud_init_iso()])
+        self.boot(img_tmp, extra_args = ["-cdrom", self.gen_cloud_init_iso()])
         self.wait_ssh()
         self.ssh_root_check("touch /etc/cloud/cloud-init.disabled")
         self.ssh_root_check("apt-get update")
