Avoid failure when non DPDK instances present

Avoid the validation failure when there are non DPDK instances. The playbook fails when there are instances not containing numatune, vcpupin or hugepages settings on the domain xml content.

Closes-Bug: #1988211

Signed-off-by: Juan Pablo Martí <jmarti@redhat.com>
Change-Id: I243f7781cd72827c0a1f9623a7e994e63d1561b0

roles/check_nfv_ovsdpdk_zero_packet_loss/tasks/validate_instance.yml

@@ -5,10 +5,12 @@
     xpath: /domain/numatune/memory
     content: attribute
   register: xml_instance_node
+  when: '"numatune" in instance_xml_data'
 
 - name: Get instance associated numa nodes
   set_fact:
     instance_numa: "{{ xml_instance_node.matches[0].memory.nodeset }}"
+  when: '"numatune" in instance_xml_data'
 
 # Validates the instance vcpus list.
 - name: Get vcpu list from xml string
@@ -17,6 +19,7 @@
     xpath: /domain/cputune/vcpupin
     content: attribute
   register: xml_vcpus
+  when: '"vcpupin" in instance_xml_data'
 
 - name: Get instance vcpus list
   set_fact:
@@ -25,6 +28,7 @@
   loop: "{{ xml_vcpus.matches }}"
   loop_control:
     loop_var: vcpu
+  when: '"vcpupin" in instance_xml_data'
 
 - name: Check vcpu's aligned with DPDK NIC's NUMA
   become: true
@@ -33,11 +37,13 @@
     numa_node: "{{ instance_numa | int }}"
     dpdk_nics_numa_info: "{{ dpdk_nics_numa_info }}"
   register: valid_cpus
+  when: '"vcpupin" in instance_xml_data'
 
 - name: Check vcpu's valid or not
   set_fact:
     validation_msg: "{{ validation_msg }} + {{ [valid_cpus.message] }}"
   when:
+    - '"vcpupin" in instance_xml_data'
     - not valid_cpus.valid_cpus
 
 # Validates instance emulatorpin threads
@@ -47,12 +53,15 @@
     xpath: /domain/cputune/emulatorpin
     content: attribute
   register: xml_emulatorpin
+  when: '"emulatorpin" in instance_xml_data'
 
 - name: Check emulatorpin valid or not
   set_fact:
     validation_msg: "{{ validation_msg }} + {{ ['Invalid emulatorpin configured for instance  ' \
                     + instance_name + ': ' + emulatorpin.emulatorpin.cpuset] }}"
-  when: "{{ emulatorpin.emulatorpin.cpuset in vcpus_list | list }}"
+  when:
+    - '"emulatorpin" in instance_xml_data'
+    - emulatorpin.emulatorpin.cpuset in vcpus_list | list
   loop: "{{ xml_emulatorpin.matches }}"
   loop_control:
     loop_var: emulatorpin
@@ -64,12 +73,15 @@
     xpath: /domain/memoryBacking/hugepages/page
     content: attribute
   register: xmlhugepages
+  when: '"memoryBacking" in instance_xml_data and "hugepages" in instance_xml_data'
 
 - name: Set instance {{ instance_name }} hugepages details
   set_fact:
     msg: |-
       Huge page size '{{ xmlhugepages.matches[0].page.size }}'
-  when: "{{ xmlhugepages.matches[0].page.size | length >= 6 }}"
+  when:
+    - '"memoryBacking" in instance_xml_data and "hugepages" in instance_xml_data'
+    - 'xmlhugepages.matches[0].page.size | length >= 6'
 
 # Validates instance tx rx queue sizes and should be greater than or equal to 1024.
 - name: Get {{ instance_name }} libvirt tx | rx queue sizes from xml string