nova/nova/virt/powervm/driver.py

# Copyright 2014, 2018 IBM Corp.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.
"""Connection to PowerVM hypervisor through NovaLink."""

import os_resource_classes as orc
from oslo_log import log as logging
from oslo_utils import excutils
from oslo_utils import importutils
from pypowervm import adapter as pvm_apt
from pypowervm import const as pvm_const
from pypowervm import exceptions as pvm_exc
from pypowervm.helpers import log_helper as log_hlp
from pypowervm.helpers import vios_busy as vio_hlp
from pypowervm.tasks import partition as pvm_par
from pypowervm.tasks import storage as pvm_stor
from pypowervm.tasks import vterm as pvm_vterm
from pypowervm.wrappers import managed_system as pvm_ms
from taskflow.patterns import linear_flow as tf_lf

from nova.compute import task_states
from nova import conf as cfg
from nova.console import type as console_type
from nova import exception as exc
from nova.i18n import _
from nova.image import glance
from nova.virt import configdrive
from nova.virt import driver
from nova.virt.powervm import host as pvm_host
from nova.virt.powervm.tasks import base as tf_base
from nova.virt.powervm.tasks import image as tf_img
from nova.virt.powervm.tasks import network as tf_net
from nova.virt.powervm.tasks import storage as tf_stg
from nova.virt.powervm.tasks import vm as tf_vm
from nova.virt.powervm import vm
from nova.virt.powervm import volume
from nova.virt.powervm.volume import fcvscsi

LOG = logging.getLogger(__name__)
CONF = cfg.CONF

DISK_ADPT_NS = 'nova.virt.powervm.disk'
DISK_ADPT_MAPPINGS = {
    'localdisk': 'localdisk.LocalStorage',
    'ssp': 'ssp.SSPDiskAdapter'
}


class PowerVMDriver(driver.ComputeDriver):
    """PowerVM NovaLink Implementation of Compute Driver.

    https://wiki.openstack.org/wiki/PowerVM
    """

    def __init__(self, virtapi):
        # NOTE(edmondsw) some of these will be dynamic in future, so putting
        # capabilities on the instance rather than on the class.
        self.capabilities = {
            'has_imagecache': False,
            'supports_bfv_rescue': False,
            'supports_evacuate': False,
            'supports_migrate_to_same_host': False,
            'supports_attach_interface': True,
            'supports_device_tagging': False,
            'supports_tagged_attach_interface': False,
            'supports_tagged_attach_volume': False,
            'supports_extend_volume': True,
            'supports_multiattach': False,
            'supports_trusted_certs': False,
            'supports_pcpus': False,
            'supports_accelerators': False,
            'supports_vtpm': False,
            'supports_secure_boot': False,
            'supports_socket_pci_numa_affinity': False,
            'supports_remote_managed_ports': False,

            # Supported image types
            "supports_image_type_aki": False,
            "supports_image_type_ami": False,
            "supports_image_type_ari": False,
            "supports_image_type_iso": False,
            "supports_image_type_qcow2": False,
            "supports_image_type_raw": True,
            "supports_image_type_vdi": False,
            "supports_image_type_vhd": False,
            "supports_image_type_vhdx": False,
            "supports_image_type_vmdk": False,
            "supports_image_type_ploop": False,
        }
        super(PowerVMDriver, self).__init__(virtapi)

    def init_host(self, host):
        """Initialize anything that is necessary for the driver to function.

        Includes catching up with currently running VMs on the given host.
        """
        LOG.warning(
            'The powervm virt driver is deprecated and may be removed in a '
            'future release. The driver is not tested by the OpenStack '
            'project nor does it have clear maintainers and thus its quality'
            'can not be ensured. If you are using the driver in production '
            'please let us know the openstack-discuss mailing list or on IRC'
        )

        # Build the adapter. May need to attempt the connection multiple times
        # in case the PowerVM management API service is starting.
        # TODO(efried): Implement async compute service enable/disable like
        # I73a34eb6e0ca32d03e54d12a5e066b2ed4f19a61
        self.adapter = pvm_apt.Adapter(
            pvm_apt.Session(conn_tries=60),
            helpers=[log_hlp.log_helper, vio_hlp.vios_busy_retry_helper])
        # Make sure the Virtual I/O Server(s) are available.
        pvm_par.validate_vios_ready(self.adapter)
        self.host_wrapper = pvm_ms.System.get(self.adapter)[0]

        # Do a scrub of the I/O plane to make sure the system is in good shape
        LOG.info("Clearing stale I/O connections on driver init.")
        pvm_stor.ComprehensiveScrub(self.adapter).execute()

        # Initialize the disk adapter
        self.disk_dvr = importutils.import_object_ns(
            DISK_ADPT_NS, DISK_ADPT_MAPPINGS[CONF.powervm.disk_driver.lower()],
            self.adapter, self.host_wrapper.uuid)
        self.image_api = glance.API()

        LOG.info("The PowerVM compute driver has been initialized.")

    @staticmethod
    def _log_operation(op, instance):
        """Log entry point of driver operations."""
        LOG.info('Operation: %(op)s. Virtual machine display name: '
                 '%(display_name)s, name: %(name)s',
                 {'op': op, 'display_name': instance.display_name,
                  'name': instance.name}, instance=instance)

    def get_info(self, instance, use_cache=True):
        """Get the current status of an instance.

        :param instance: nova.objects.instance.Instance object
        :param use_cache: unused in this driver
        :returns: An InstanceInfo object.
        """
        return vm.get_vm_info(self.adapter, instance)

    def list_instances(self):
        """Return the names of all the instances known to the virt host.

        :return: VM Names as a list.
        """
        return vm.get_lpar_names(self.adapter)

    def get_available_nodes(self, refresh=False):
        """Returns nodenames of all nodes managed by the compute service.

        This method is for multi compute-nodes support. If a driver supports
        multi compute-nodes, this method returns a list of nodenames managed
        by the service. Otherwise, this method should return
        [hypervisor_hostname].
        """

        return [CONF.host]

    def get_available_resource(self, nodename):
        """Retrieve resource information.

        This method is called when nova-compute launches, and as part of a
        periodic task.

        :param nodename: Node from which the caller wants to get resources.
                         A driver that manages only one node can safely ignore
                         this.
        :return: Dictionary describing resources.
        """
        # Do this here so it refreshes each time this method is called.
        self.host_wrapper = pvm_ms.System.get(self.adapter)[0]
        return self._get_available_resource()

    def _get_available_resource(self):
        # Get host information
        data = pvm_host.build_host_resource_from_ms(self.host_wrapper)

        # Add the disk information
        data["local_gb"] = self.disk_dvr.capacity
        data["local_gb_used"] = self.disk_dvr.capacity_used

        return data

    def update_provider_tree(self, provider_tree, nodename, allocations=None):
        """Update a ProviderTree with current provider and inventory data.

        :param nova.compute.provider_tree.ProviderTree provider_tree:
            A nova.compute.provider_tree.ProviderTree object representing all
            the providers in the tree associated with the compute node, and any
            sharing providers (those with the ``MISC_SHARES_VIA_AGGREGATE``
            trait) associated via aggregate with any of those providers (but
            not *their* tree- or aggregate-associated providers), as currently
            known by placement.
        :param nodename:
            String name of the compute node (i.e.
            ComputeNode.hypervisor_hostname) for which the caller is requesting
            updated provider information.
        :param allocations: Currently ignored by this driver.
        """
        # Get (legacy) resource information. Same as get_available_resource,
        # but we don't need to refresh self.host_wrapper as it was *just*
        # refreshed by get_available_resource in the resource tracker's
        # update_available_resource flow.
        data = self._get_available_resource()

        # NOTE(yikun): If the inv record does not exists, the allocation_ratio
        # will use the CONF.xxx_allocation_ratio value if xxx_allocation_ratio
        # is set, and fallback to use the initial_xxx_allocation_ratio
        # otherwise.
        inv = provider_tree.data(nodename).inventory
        ratios = self._get_allocation_ratios(inv)
        # TODO(efried): Fix these to reflect something like reality
        cpu_reserved = CONF.reserved_host_cpus
        mem_reserved = CONF.reserved_host_memory_mb
        disk_reserved = self._get_reserved_host_disk_gb_from_config()

        inventory = {
            orc.VCPU: {
                'total': data['vcpus'],
                'max_unit': data['vcpus'],
                'allocation_ratio': ratios[orc.VCPU],
                'reserved': cpu_reserved,
            },
            orc.MEMORY_MB: {
                'total': data['memory_mb'],
                'max_unit': data['memory_mb'],
                'allocation_ratio': ratios[orc.MEMORY_MB],
                'reserved': mem_reserved,
            },
            orc.DISK_GB: {
                # TODO(efried): Proper DISK_GB sharing when SSP driver in play
                'total': int(data['local_gb']),
                'max_unit': int(data['local_gb']),
                'allocation_ratio': ratios[orc.DISK_GB],
                'reserved': disk_reserved,
            },
        }
        provider_tree.update_inventory(nodename, inventory)

    def spawn(self, context, instance, image_meta, injected_files,
              admin_password, allocations, network_info=None,
              block_device_info=None, power_on=True, accel_info=None):
        """Create a new instance/VM/domain on the virtualization platform.

        Once this successfully completes, the instance should be
        running (power_state.RUNNING).

        If this fails, any partial instance should be completely
        cleaned up, and the virtualization platform should be in the state
        that it was before this call began.

        :param context: security context
        :param instance: nova.objects.instance.Instance
                         This function should use the data there to guide
                         the creation of the new instance.
        :param nova.objects.ImageMeta image_meta:
            The metadata of the image of the instance.
        :param injected_files: User files to inject into instance.
        :param admin_password: Administrator password to set in instance.
        :param allocations: Information about resources allocated to the
                            instance via placement, of the form returned by
                            SchedulerReportClient.get_allocations_for_consumer.
        :param network_info: instance network information
        :param block_device_info: Information about block devices to be
                                  attached to the instance.
        :param power_on: True if the instance should be powered on, False
                         otherwise
        """
        self._log_operation('spawn', instance)
        # Define the flow
        flow_spawn = tf_lf.Flow("spawn")

        # This FeedTask accumulates VIOS storage connection operations to be
        # run in parallel. Include both SCSI and fibre channel mappings for
        # the scrubber.
        stg_ftsk = pvm_par.build_active_vio_feed_task(
            self.adapter, xag={pvm_const.XAG.VIO_SMAP, pvm_const.XAG.VIO_FMAP})

        flow_spawn.add(tf_vm.Create(
            self.adapter, self.host_wrapper, instance, stg_ftsk))

        # Create a flow for the IO
        flow_spawn.add(tf_net.PlugVifs(
            self.virtapi, self.adapter, instance, network_info))
        flow_spawn.add(tf_net.PlugMgmtVif(
            self.adapter, instance))

        # Create the boot image.
        flow_spawn.add(tf_stg.CreateDiskForImg(
            self.disk_dvr, context, instance, image_meta))
        # Connects up the disk to the LPAR
        flow_spawn.add(tf_stg.AttachDisk(
            self.disk_dvr, instance, stg_ftsk=stg_ftsk))

        # Extract the block devices.
        bdms = driver.block_device_info_get_mapping(block_device_info)

        # Determine if there are volumes to connect.  If so, add a connection
        # for each type.
        for bdm, vol_drv in self._vol_drv_iter(context, instance, bdms,
                                               stg_ftsk=stg_ftsk):
            # Connect the volume.  This will update the connection_info.
            flow_spawn.add(tf_stg.AttachVolume(vol_drv))

        # If the config drive is needed, add those steps.  Should be done
        # after all the other I/O.
        if configdrive.required_by(instance):
            flow_spawn.add(tf_stg.CreateAndConnectCfgDrive(
                self.adapter, instance, injected_files, network_info,
                stg_ftsk, admin_pass=admin_password))

        # Add the transaction manager flow at the end of the 'I/O
        # connection' tasks. This will run all the connections in parallel.
        flow_spawn.add(stg_ftsk)

        # Last step is to power on the system.
        flow_spawn.add(tf_vm.PowerOn(self.adapter, instance))

        # Run the flow.
        tf_base.run(flow_spawn, instance=instance)

    def destroy(self, context, instance, network_info, block_device_info=None,
                destroy_disks=True):
        """Destroy the specified instance from the Hypervisor.

        If the instance is not found (for example if networking failed), this
        function should still succeed. It's probably a good idea to log a
        warning in that case.

        :param context: security context
        :param instance: Instance object as returned by DB layer.
        :param network_info: instance network information
        :param block_device_info: Information about block devices that should
                                  be detached from the instance.
        :param destroy_disks: Indicates if disks should be destroyed
        """
        # TODO(thorst, efried) Add resize checks for destroy

        self._log_operation('destroy', instance)

        def _setup_flow_and_run():
            # Define the flow
            flow = tf_lf.Flow("destroy")

            # Power Off the LPAR. If its disks are about to be deleted, issue a
            # hard shutdown.
            flow.add(tf_vm.PowerOff(self.adapter, instance,
                                    force_immediate=destroy_disks))

            # The FeedTask accumulates storage disconnection tasks to be run in
            # parallel.
            stg_ftsk = pvm_par.build_active_vio_feed_task(
                self.adapter, xag=[pvm_const.XAG.VIO_SMAP])

            # Call the unplug VIFs task.  While CNAs get removed from the LPAR
            # directly on the destroy, this clears up the I/O Host side.
            flow.add(tf_net.UnplugVifs(self.adapter, instance, network_info))

            # Add the disconnect/deletion of the vOpt to the transaction
            # manager.
            if configdrive.required_by(instance):
                flow.add(tf_stg.DeleteVOpt(
                    self.adapter, instance, stg_ftsk=stg_ftsk))

            # Extract the block devices.
            bdms = driver.block_device_info_get_mapping(block_device_info)

            # Determine if there are volumes to detach.  If so, remove each
            # volume (within the transaction manager)
            for bdm, vol_drv in self._vol_drv_iter(
                     context, instance, bdms, stg_ftsk=stg_ftsk):
                flow.add(tf_stg.DetachVolume(vol_drv))

            # Detach the disk storage adapters
            flow.add(tf_stg.DetachDisk(self.disk_dvr, instance))

            # Accumulated storage disconnection tasks next
            flow.add(stg_ftsk)

            # Delete the storage disks
            if destroy_disks:
                flow.add(tf_stg.DeleteDisk(self.disk_dvr))

            # TODO(thorst, efried) Add LPAR id based scsi map clean up task
            flow.add(tf_vm.Delete(self.adapter, instance))

            # Build the engine & run!
            tf_base.run(flow, instance=instance)

        try:
            _setup_flow_and_run()
        except exc.InstanceNotFound:
            LOG.debug('VM was not found during destroy operation.',
                      instance=instance)
            return
        except pvm_exc.Error as e:
            LOG.exception("PowerVM error during destroy.", instance=instance)
            # Convert to a Nova exception
            raise exc.InstanceTerminationFailure(reason=str(e))

    def snapshot(self, context, instance, image_id, update_task_state):
        """Snapshots the specified instance.

        :param context: security context
        :param instance: nova.objects.instance.Instance
        :param image_id: Reference to a pre-created image that will hold the
                         snapshot.
        :param update_task_state: Callback function to update the task_state
            on the instance while the snapshot operation progresses. The
            function takes a task_state argument and an optional
            expected_task_state kwarg which defaults to
            nova.compute.task_states.IMAGE_SNAPSHOT. See
            nova.objects.instance.Instance.save for expected_task_state usage.
        """

        if not self.disk_dvr.capabilities.get('snapshot'):
            raise exc.NotSupportedWithOption(
                message=_("The snapshot operation is not supported in "
                          "conjunction with a [powervm]/disk_driver setting "
                          "of %s.") % CONF.powervm.disk_driver)

        self._log_operation('snapshot', instance)

        # Define the flow.
        flow = tf_lf.Flow("snapshot")

        # Notify that we're starting the process.
        flow.add(tf_img.UpdateTaskState(update_task_state,
                                        task_states.IMAGE_PENDING_UPLOAD))

        # Connect the instance's boot disk to the management partition, and
        # scan the scsi bus and bring the device into the management partition.
        flow.add(tf_stg.InstanceDiskToMgmt(self.disk_dvr, instance))

        # Notify that the upload is in progress.
        flow.add(tf_img.UpdateTaskState(
            update_task_state, task_states.IMAGE_UPLOADING,
            expected_state=task_states.IMAGE_PENDING_UPLOAD))

        # Stream the disk to glance.
        flow.add(tf_img.StreamToGlance(context, self.image_api, image_id,
                                       instance))

        # Disconnect the boot disk from the management partition and delete the
        # device.
        flow.add(tf_stg.RemoveInstanceDiskFromMgmt(self.disk_dvr, instance))

        # Run the flow.
        tf_base.run(flow, instance=instance)

    def power_off(self, instance, timeout=0, retry_interval=0):
        """Power off the specified instance.

        :param instance: nova.objects.instance.Instance
        :param timeout: time to wait for GuestOS to shutdown
        :param retry_interval: How often to signal guest while
                               waiting for it to shutdown
        """
        self._log_operation('power_off', instance)
        force_immediate = (timeout == 0)
        timeout = timeout or None
        vm.power_off(self.adapter, instance, force_immediate=force_immediate,
                     timeout=timeout)

    def power_on(self, context, instance, network_info,
                 block_device_info=None, accel_info=None):
        """Power on the specified instance.

        :param instance: nova.objects.instance.Instance
        """
        self._log_operation('power_on', instance)
        vm.power_on(self.adapter, instance)

    def reboot(self, context, instance, network_info, reboot_type,
               block_device_info=None, bad_volumes_callback=None,
               accel_info=None):
        """Reboot the specified instance.

        After this is called successfully, the instance's state
        goes back to power_state.RUNNING. The virtualization
        platform should ensure that the reboot action has completed
        successfully even in cases in which the underlying domain/vm
        is paused or halted/stopped.

        :param instance: nova.objects.instance.Instance
        :param network_info: `nova.network.models.NetworkInfo` object
            describing the network metadata.
        :param reboot_type: Either a HARD or SOFT reboot
        :param block_device_info: Info pertaining to attached volumes
        :param bad_volumes_callback: Function to handle any bad volumes
            encountered
        :param accel_info: List of accelerator request dicts. The exact
            data struct is doc'd in nova/virt/driver.py::spawn().
        """
        self._log_operation(reboot_type + ' reboot', instance)
        vm.reboot(self.adapter, instance, reboot_type == 'HARD')
        # pypowervm exceptions are sufficient to indicate real failure.
        # Otherwise, pypowervm thinks the instance is up.

    def attach_interface(self, context, instance, image_meta, vif):
        """Attach an interface to the instance."""
        self.plug_vifs(instance, [vif])

    def detach_interface(self, context, instance, vif):
        """Detach an interface from the instance."""
        self.unplug_vifs(instance, [vif])

    def plug_vifs(self, instance, network_info):
        """Plug VIFs into networks."""
        self._log_operation('plug_vifs', instance)

        # Define the flow
        flow = tf_lf.Flow("plug_vifs")

        # Get the LPAR Wrapper
        flow.add(tf_vm.Get(self.adapter, instance))

        # Run the attach
        flow.add(tf_net.PlugVifs(self.virtapi, self.adapter, instance,
                                 network_info))

        # Run the flow
        try:
            tf_base.run(flow, instance=instance)
        except exc.InstanceNotFound:
            raise exc.VirtualInterfacePlugException(
                _("Plug vif failed because instance %s was not found.")
                % instance.name)
        except Exception:
            LOG.exception("PowerVM error plugging vifs.", instance=instance)
            raise exc.VirtualInterfacePlugException(
                _("Plug vif failed because of an unexpected error."))

    def unplug_vifs(self, instance, network_info):
        """Unplug VIFs from networks."""
        self._log_operation('unplug_vifs', instance)

        # Define the flow
        flow = tf_lf.Flow("unplug_vifs")

        # Run the detach
        flow.add(tf_net.UnplugVifs(self.adapter, instance, network_info))

        # Run the flow
        try:
            tf_base.run(flow, instance=instance)
        except exc.InstanceNotFound:
            LOG.warning('VM was not found during unplug operation as it is '
                        'already possibly deleted.', instance=instance)
        except Exception:
            LOG.exception("PowerVM error trying to unplug vifs.",
                          instance=instance)
            raise exc.InterfaceDetachFailed(instance_uuid=instance.uuid)

    def get_vnc_console(self, context, instance):
        """Get connection info for a vnc console.

        :param context: security context
        :param instance: nova.objects.instance.Instance

        :return: An instance of console.type.ConsoleVNC
        """
        self._log_operation('get_vnc_console', instance)
        lpar_uuid = vm.get_pvm_uuid(instance)

        # Build the connection to the VNC.
        host = CONF.vnc.server_proxyclient_address
        # TODO(thorst, efried) Add the x509 certificate support when it lands

        try:
            # Open up a remote vterm
            port = pvm_vterm.open_remotable_vnc_vterm(
                self.adapter, lpar_uuid, host, vnc_path=lpar_uuid)
            # Note that the VNC viewer will wrap the internal_access_path with
            # the HTTP content.
            return console_type.ConsoleVNC(host=host, port=port,
                                           internal_access_path=lpar_uuid)
        except pvm_exc.HttpError as e:
            with excutils.save_and_reraise_exception(logger=LOG) as sare:
                # If the LPAR was not found, raise a more descriptive error
                if e.response.status == 404:
                    sare.reraise = False
                    raise exc.InstanceNotFound(instance_id=instance.uuid)

    def attach_volume(self, context, connection_info, instance, mountpoint,
                      disk_bus=None, device_type=None, encryption=None):
        """Attach the volume to the instance using the connection_info.

        :param context: security context
        :param connection_info: Volume connection information from the block
                                device mapping
        :param instance: nova.objects.instance.Instance
        :param mountpoint: Unused
        :param disk_bus: Unused
        :param device_type: Unused
        :param encryption: Unused
        """
        self._log_operation('attach_volume', instance)

        # Define the flow
        flow = tf_lf.Flow("attach_volume")

        # Build the driver
        vol_drv = volume.build_volume_driver(self.adapter, instance,
                                             connection_info)

        # Add the volume attach to the flow.
        flow.add(tf_stg.AttachVolume(vol_drv))

        # Run the flow
        tf_base.run(flow, instance=instance)

        # The volume connector may have updated the system metadata.  Save
        # the instance to persist the data.  Spawn/destroy auto saves instance,
        # but the attach does not.  Detach does not need this save - as the
        # detach flows do not (currently) modify system metadata.  May need
        # to revise in the future as volume connectors evolve.
        instance.save()

    def detach_volume(self, context, connection_info, instance, mountpoint,
                      encryption=None):
        """Detach the volume attached to the instance.

        :param context: security context
        :param connection_info: Volume connection information from the block
                                device mapping
        :param instance: nova.objects.instance.Instance
        :param mountpoint: Unused
        :param encryption: Unused
        """
        self._log_operation('detach_volume', instance)

        # Define the flow
        flow = tf_lf.Flow("detach_volume")

        # Get a volume adapter for this volume
        vol_drv = volume.build_volume_driver(self.adapter, instance,
                                             connection_info)

        # Add a task to detach the volume
        flow.add(tf_stg.DetachVolume(vol_drv))

        # Run the flow
        tf_base.run(flow, instance=instance)

    def extend_volume(self, context, connection_info, instance,
                      requested_size):
        """Extend the disk attached to the instance.

        :param context: security context
        :param dict connection_info: The connection for the extended volume.
        :param nova.objects.instance.Instance instance:
            The instance whose volume gets extended.
        :param int requested_size: The requested new volume size in bytes.
        :return: None
        """

        vol_drv = volume.build_volume_driver(
            self.adapter, instance, connection_info)
        vol_drv.extend_volume()

    def _vol_drv_iter(self, context, instance, bdms, stg_ftsk=None):
        """Yields a bdm and volume driver.

        :param context: security context
        :param instance: nova.objects.instance.Instance
        :param bdms: block device mappings
        :param stg_ftsk: storage FeedTask
        """
        # Get a volume driver for each volume
        for bdm in bdms or []:
            conn_info = bdm.get('connection_info')
            vol_drv = volume.build_volume_driver(self.adapter, instance,
                                                 conn_info, stg_ftsk=stg_ftsk)
            yield bdm, vol_drv

    def get_volume_connector(self, instance):
        """Get connector information for the instance for attaching to volumes.

        Connector information is a dictionary representing information about
        the system that will be making the connection.

        :param instance: nova.objects.instance.Instance
        """
        # Put the values in the connector
        connector = {}
        wwpn_list = fcvscsi.wwpns(self.adapter)

        if wwpn_list is not None:
            connector["wwpns"] = wwpn_list
        connector["multipath"] = False
        connector['host'] = CONF.host
        connector['initiator'] = None

        return connector