nvdimm_mode: Add new case to test change nvdimm mode inside guest

Signed-off-by: NYumei Huang <yuhuang@redhat.com>

qemu/tests/cfg/nvdimm.cfg

@@ -66,3 +66,20 @@
             check_command = "grep -A21 '${nv_backend}' /proc/%s/smaps"
             clean_command = "rm -rf ${mount_dir}/${nv_backend} && umount ${mount_dir} && rm -rf ${mount_dir}"
             start_vm = no
+        - nvdimm_mode:
+            type = nvdimm_mode
+            mem_devs = mem1 mem2
+            mem-path_mem1 = /tmp/test1.img
+            mem-path_mem2 = /tmp/test2.img
+            align_mem1 = 128M
+            align_mem2 = 128M
+            dimm_extra_params = "label-size=2M"
+            pre_command = "dd if=/dev/zero of=${mem-path_mem1} bs=1M count=1024"
+            pre_command += "; dd if=/dev/zero of=${mem-path_mem2} bs=1M count=1024"
+            post_command = "rm -rf ${mem-path_mem1} ${mem-path_mem2}"
+            create_dax_cmd = "ndctl create-namespace -m dax -e namespace%s.0 -f -v -a 4096"
+            ndctl_check_cmd = "ndctl list"
+            del mount_dir
+            del dev_path
+            del format_command
+            del mount_command

qemu/tests/nvdimm_mode.py

+from virttest import utils_package
+from virttest import error_context
+
+
+@error_context.context_aware
+def run(test, params, env):
+    """
+    Run nvdimm cases:
+    1) Boot guest with two nvdimm devices
+    2) Change the two nvdimm devices to dax mode inside guest
+    3) Check if both devices are dax mode
+
+    :param test: QEMU test object
+    :param params: Dictionary with the test parameters
+    :param env: Dictionary with test environment.
+    """
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    session = vm.wait_for_login()
+    if not utils_package.package_install("ndctl", session):
+        test.cancel("Please install ndctl inside guest to proceed")
+    create_dax_cmd = params["create_dax_cmd"]
+    nvdimm_number = len(params["mem_devs"].split())
+    try:
+        for i in range(nvdimm_number):
+            session.cmd(create_dax_cmd % i)
+        output = session.cmd_output(params["ndctl_check_cmd"])
+        output = eval(output)
+        for item in output:
+            if item['mode'] != 'devdax':
+                test.fail("Change both nvdimm to dax mode failed")
+    finally:
+        utils_package.package_remove("ndctl", session)
+        session.close()
+        vm.destroy()