Enable host-passthrough for virt control plane

PROD-36510

Change-Id: Iba943e4708c1c905e899671d0afcafc472565e75
diff --git a/salt/control/cluster/openstack_benchmark_single.yml b/salt/control/cluster/openstack_benchmark_single.yml
index 3d2bacd..dfe7eb8 100644
--- a/salt/control/cluster/openstack_benchmark_single.yml
+++ b/salt/control/cluster/openstack_benchmark_single.yml
@@ -29,3 +29,4 @@
               backend: ${_param:openstack_benchmark_backend_image}
               size: openstack.benchmark
               cloud_init: ${_param:salt_control_cluster_node_cloud_init_openstack_benchmark}
+              cpu_mode: ${_param:salt_control_cluster_qemu_cpu_model}