nvme_plug: New case to test hot plug and unplug NVMe device

New a case that hot plug and unplug with a NVMe device.
Signed-off-by: NYongxue Hong <yhong@redhat.com>

qemu/tests/cfg/nvme_plug.cfg

+- nvme_plug:
+    only nvme_direct
+    type = nvme_plug
+    start_vm = no
+    kill_vm = yes
+    kill_vm_gracefully = yes
+    shutdown_cleanly = yes
+    shutdown_cleanly_timeout = 120
+    guest_port_unattended_install = 12323
+    kernel = vmlinuz
+    initrd = initrd.img
+    inactivity_watcher = error
+    inactivity_treshold = 1800
+    image_verify_bootable = no
+    image_copy_on_error = no
+    lowest_mem = 512
+    install_trigger_time = 0
+    install_timeout = 7200
+    random_trigger = "no"
+    unattended_delivery_method = cdrom
+    cdroms += " unattended"
+    enable_nvme_cd1 = no
+    enable_nvme_unattended = no
+    enable_nvme_winutils = no
+    drive_index_unattended = 1
+    drive_index_cd1 = 2
+    boot_once = d
+    medium = cdrom
+    virtio_scsi:
+        iothread_scheme ?=
+        iothreads ?=
+        image_iothread ?=
+    images = 'sys stg'
+    data_img_tag = stg
+    enable_nvme_sys = no
+    image_backend_sys = filesystem
+    image_name_sys = images/sys
+    image_format_sys = qcow2
+    image_size_sys = 30G
+    force_create_image_sys = yes
+    remove_image_sys = yes
+    default_cdroms = winutils
+    image_size_stg = 5G
+    force_create_image_stg = yes
+    boot_drive_stg = no
+    remove_image_stg = no
+    fio_default_options = '--direct=1 --bs=64K --size=2G --name=test --iodepth=4'
+    Windows:
+        blk_extra_params_sys = "serial=SYSTEM_DISK0"
+        fio_filename = fio_data_disk_test
+        i440fx:
+            cd_format_unattended = ide
+            cd_format_cd1 = ide
+            cd_format_winutils = ide
+        q35:
+            cd_format_unattended = ahci
+            cd_format_cd1 = ahci
+            cd_format_winutils = ahci
+    Linux:
+        fio_default_options += ' --ioengine=libaio '
+        remove_options = kernel initrd kernel_params
+    fio_options = '${fio_default_options} --rw=read;'
+    fio_options += '${fio_default_options} --rw=write;'
+    fio_options += '${fio_default_options} --rw=randread;'
+    fio_options += '${fio_default_options} --rw=randwrite;'
+    fio_options += '${fio_default_options} --rw=randrw'
+    variants:
+        # Below variants is to share configurations related to installation defined.
+        - @with_installation:
+            variants:
+                - @extra_cdrom_ks:

qemu/tests/nvme_plug.py

+from virttest import env_process
+from virttest import utils_disk
+from virttest.tests import unattended_install
+
+from provider.block_devices_plug import BlockDevicesPlug
+from provider.storage_benchmark import generate_instance
+
+
+def run(test, params, env):
+    """
+    Test hot plug and unplug NVMe device.
+
+    Steps:
+        1. Install guest with local filesystem.
+        2. Hot plug NVMe device to guest.
+        3. Check if the NVMe device exists in qemu side.
+        4. Check if the NVMe has been successfully added to guest.
+        5. Run fio in the hot plugged NVMe device in guest.
+        6. Unplug the NVMe device.
+        7. Check if the NVMe device still exists.
+        8. Check if the NVMe has been successfully removed from guest.
+        9. Reboot guest.
+
+    :param test:   QEMU test object.
+    :param params: Dictionary with the test parameters.
+    :param env:    Dictionary with test environment.
+    """
+    unattended_install.run(test, params, env)
+
+    if params.get('remove_options'):
+        for option in params.get('remove_options').split():
+            del params[option]
+    params['cdroms'] = params.get('default_cdroms')
+
+    params['start_vm'] = 'yes'
+    env_process.preprocess_vm(test, params, env, params["main_vm"])
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    session = vm.wait_for_login()
+
+    plug = BlockDevicesPlug(vm)
+    plug.hotplug_devs_serial()
+    target = '/dev/%s' % plug[0]
+    os_type = params['os_type']
+    data_img_size = params.get('image_size_%s' % params.get('data_img_tag'))
+    if os_type == 'windows':
+        utils_disk.update_windows_disk_attributes(session, plug[0])
+        drive_letter = utils_disk.configure_empty_disk(session, plug[0],
+                                                       data_img_size,
+                                                       os_type)[0]
+        target = r'%s\:\\%s' % (drive_letter, params.get('fio_filename'))
+    fio = generate_instance(params, vm, 'fio')
+    for option in params['fio_options'].split(';'):
+        fio.run('--filename=%s %s' % (target, option))
+    plug.unplug_devs_serial()
+    vm.reboot(session)