libvirt_vm: enablement of SAN based guest with LUN id

Boot guest with SAN based storage type using LUN id which can be
retrieved from /dev/disk/by-id, this enablement helps to use the
guest for SAN based migration tests. As LUN id would be same when
LUN is shared across multiple host and it is necessary for
migration to succeed.

Suggested-by: Satheesh Rajendran <[email protected]>
Signed-off-by: Balamuruhan S <[email protected]>

shared/cfg/guest-hw.cfg

@@ -306,6 +306,19 @@ variants image_backend:
         image_raw_device = yes
         storage_type = iscsi
         force_create_image = no
+    - san:
+        # Please update image_name and images_base_dir params based on your test env
+        only raw
+        storage_type = "san"
+        drive_format = "scsi"
+        driver_name = "qemu"
+        images_base_dir = "/dev/disk/by-id"
+        image_name = "scsi-360050768028211d8b0000000000000b9"
+        image_format = "raw"
+        drive_cache = "none"
+        image_device = "lun"
+        image_raw_device = yes
+        force_create_image = no
     - remote_nfs:
         storage_type = nfs
         nfs_mount_dir = /mnt/nfs_images

virttest/libvirt_vm.py

@@ -726,7 +726,7 @@ def check_controller(virt_install_cmd_line, controller):
 
         def add_drive(help_text, filename, pool=None, vol=None, device=None,
                       bus=None, perms=None, size=None, sparse=False,
-                      cache=None, fmt=None):
+                      cache=None, fmt=None, driver_name=None):
             cmd = " --disk"
             if filename:
                 cmd += " path=%s" % filename
@@ -749,6 +749,8 @@ def add_drive(help_text, filename, pool=None, vol=None, device=None,
                 cmd += ",format=%s" % fmt
             if cache:
                 cmd += ",cache=%s" % cache
+            if driver_name:
+                cmd += ",driver_name=%s" % driver_name
             return cmd
 
         def add_floppy(help_text, filename):
@@ -1228,13 +1230,14 @@ def add_cputune(vcpu_cputune=""):
                                               filename,
                                               None,
                                               None,
-                                              None,
+                                              image_params.get("image_device"),
                                               _drive_format,
                                               None,
                                               image_params.get("image_size"),
                                               image_params.get("drive_sparse"),
                                               image_params.get("drive_cache"),
-                                              image_params.get("image_format"))
+                                              image_params.get("image_format"),
+                                              image_params.get("driver_name"))
 
         unattended_integrated = (params.get('unattended_delivery_method') !=
                                  'integrated')

virttest/storage.py

@@ -234,7 +234,8 @@ def cmp(x, y):
     image_format = params.get("image_format", "qcow2")
     if params.get("image_raw_device") == "yes":
         return image_name
-    if image_format:
+    storage_type = params.get("storage_type")
+    if image_format and storage_type != "san":
         image_filename = "%s.%s" % (image_name, image_format)
     else:
         image_filename = image_name