diff --git a/zuul.d/base.yaml b/zuul.d/base.yaml
index 12408ea..7af1840 100644
--- a/zuul.d/base.yaml
+++ b/zuul.d/base.yaml
@@ -17,6 +17,8 @@
         USE_PYTHON3: true
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_tempest) | join(',') }}"
         CIRROS_VERSION: 0.5.1
+        DEFAULT_IMAGE_NAME: cirros-0.5.1-x86_64-uec
+        DEFAULT_IMAGE_FILE_NAME: cirros-0.5.1-x86_64-uec.tar.gz
         BUILD_TIMEOUT: 784
       devstack_plugins:
         neutron: https://opendev.org/openstack/neutron.git
@@ -96,6 +98,14 @@
     name: neutron-tempest-plugin-scenario
     parent: neutron-tempest-plugin-base
     abstract: true
+    nodeset:
+      nodes:
+        - name: controller
+          label: nested-virt-ubuntu-focal
+      groups:
+        - name: tempest
+          nodes:
+            - controller
     description: |
       Perform setup common to all tempest scenario test jobs.
     vars:
@@ -108,8 +118,12 @@
           (^tempest.api.compute.servers.test_attach_interfaces)|\
           (^tempest.api.compute.servers.test_multiple_create)"
       devstack_localrc:
+        LIBVIRT_TYPE: kvm
+        LIBVIRT_CPU_MODE: host-passthrough
         PHYSICAL_NETWORK: default
         CIRROS_VERSION: 0.5.1
+        DEFAULT_IMAGE_NAME: cirros-0.5.1-x86_64-disk
+        DEFAULT_IMAGE_FILE_NAME: cirros-0.5.1-x86_64-disk.img
         IMAGE_URLS: https://cloud-images.ubuntu.com/minimal/releases/focal/release/ubuntu-20.04-minimal-cloudimg-amd64.img
         ADVANCED_IMAGE_NAME: ubuntu-20.04-minimal-cloudimg-amd64
         ADVANCED_INSTANCE_TYPE: ntp_image_256M