Allow extra storage parameters to be configured

defaults/main.yml

@@ -1,5 +1,6 @@
 ---
 xen_vm_creator_install_genconfdrv: true
+xen_vm_creator_extra_storage_args:
 
 # vm parameters
 xen_vm_creator_vm_defaults:

tasks/install-vm.yml

@@ -65,6 +65,7 @@
   vars:
     iso_path: "{{ xen_vm_creator_iso_dir }}/{{ vm.hostname}}.iso"
     storage_path: "phy:/dev/{{ xen_vm_creator_lvm_vg_name }}/{{ vm.hostname }}-disk"
+    extra_storage_args: "{{ xen_vm_creator_extra_storage_args|default }}"
 
 # provision storage
 # --> lvm: create lv (lvol size/vg/lv)

templates/xen-vm.cfg.j2

@@ -7,7 +7,7 @@ maxmem                = '{{ vm.maxmem }}'
 vcpus                 = {{ vm.vcpus }}
 maxvcpus              = {{ vm.max_vcpus }}
 disk                  = [
-                        '{{ storage_path }},xvda,w',
+                        '{{ storage_path }},xvda,w{% if extra_storage_args|default %},{{ extra_storage_args }}{% endif %}',
                         'file:{{ iso_path }},xvdb:cdrom,r', # --> {{ xen_vm_creator_iso_file_marker }}
 ]
 vif                 = [