Choose virt type automatically

If nova_virt_type variable is not defined in defaults/main.yml,
Using command "egrep -c '(vmx|svm)' /proc/cpuinfo" in
deploy environment, it can easily tell us what the right
virt_type is according to the return value.

If this command returns a value of one or greater, your
compute node supports hardware acceleration and just set
virt_type = kvm.

If this command returns a value of zero, your compute node
does not support hardware acceleration and you must configure
virt_type = qemu instead of kvm.

Change-Id: I6e36ffcb56d50556df0803aea9f4cd7850fada5a

defaults/main.yml

@@ -60,6 +60,9 @@ nova_rpc_thread_pool_size: 64
 nova_rpc_conn_pool_size: 30
 nova_rpc_response_timeout: 60
 
+## Nova virtualization Type Autodetect, set to True if nova_virt_type is not set
+nova_virt_autodetect: True
+
 ## Nova virtualization Type, set to KVM if supported
 nova_virt_type: kvm
 

tasks/nova_compute.yml

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 - include: nova_compute_kvm.yml
-  when: nova_virt_type == 'kvm' or nova_virt_type == 'qemu'
+  when: nova_virt_type == 'kvm' or nova_virt_type == 'qemu' or nova_virt_autodetect | bool
 
 - include: nova_compute_key_populate.yml
 

tasks/nova_post_install.yml

@@ -13,6 +13,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Get virt type value and store as var
+  shell: |
+    /usr/bin/egrep -c '(vmx|svm)' /proc/cpuinfo
+  register: virt_type_value
+  changed_when: false
+  failed_when: false
+  when: nova_virt_type != 'kvm' and nova_virt_type != 'qemu' and nova_virt_autodetect | bool
+  tags:
+    - nova-config
+    - nova-post-install
+
+- name: Register a fact for the nova virt type
+  set_fact:
+     nova_virt_type: "{{ ((virt_type_value.stdout | int) > 0) | ternary('kvm', 'qemu') }}"
+  when: nova_virt_type != 'kvm' and nova_virt_type != 'qemu' and nova_virt_autodetect | bool
+  tags:
+    - nova-config
+    - nova-post-install
+
 - name: Copy nova config
   config_template:
     src: "{{ item.src }}"