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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2013 Cloudbase Solutions Srl
# All Rights Reserved.
#
# 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.
import sys
if sys.platform == 'win32':
import wmi
from nova import exception
from nova.openstack.common import log as logging
from nova.virt.hyperv import vmutils
from nova.virt.hyperv import volumeutilsv2
LOG = logging.getLogger(__name__)
class LiveMigrationUtils(object):
def __init__(self):
self._vmutils = vmutils.VMUtils()
self._volutils = volumeutilsv2.VolumeUtilsV2()
def _get_conn_v2(self, host='localhost'):
try:
return wmi.WMI(moniker='//%s/root/virtualization/v2' % host)
except wmi.x_wmi as ex:
LOG.exception(ex)
if ex.com_error.hresult == -2147217394:
msg = (_('Live migration is not supported on target host "%s"')
% host)
elif ex.com_error.hresult == -2147023174:
msg = (_('Target live migration host "%s" is unreachable')
% host)
else:
msg = _('Live migration failed: %s') % ex.message
raise vmutils.HyperVException(msg)
def check_live_migration_config(self):
conn_v2 = self._get_conn_v2()
migration_svc = conn_v2.Msvm_VirtualSystemMigrationService()[0]
vsmssds = migration_svc.associators(
wmi_association_class='Msvm_ElementSettingData',
wmi_result_class='Msvm_VirtualSystemMigrationServiceSettingData')
vsmssd = vsmssds[0]
if not vsmssd.EnableVirtualSystemMigration:
raise vmutils.HyperVException(
_('Live migration is not enabled on this host'))
if not migration_svc.MigrationServiceListenerIPAddressList:
raise vmutils.HyperVException(
_('Live migration networks are not configured on this host'))
def _get_vm(self, conn_v2, vm_name):
vms = conn_v2.Msvm_ComputerSystem(ElementName=vm_name)
n = len(vms)
if not n:
raise exception.NotFound(_('VM not found: %s') % vm_name)
elif n > 1:
raise vmutils.HyperVException(_('Duplicate VM name found: %s')
% vm_name)
return vms[0]
def _destroy_planned_vm(self, conn_v2_remote, planned_vm):
LOG.debug(_("Destroying existing remote planned VM: %s"),
planned_vm.ElementName)
vs_man_svc = conn_v2_remote.Msvm_VirtualSystemManagementService()[0]
(job_path, ret_val) = vs_man_svc.DestroySystem(planned_vm.path_())
self._vmutils.check_ret_val(ret_val, job_path)
def _check_existing_planned_vm(self, conn_v2_remote, vm):
# Make sure that there's not yet a remote planned VM on the target
# host for this VM
planned_vms = conn_v2_remote.Msvm_PlannedComputerSystem(Name=vm.Name)
if planned_vms:
self._destroy_planned_vm(conn_v2_remote, planned_vms[0])
def _create_remote_planned_vm(self, conn_v2_local, conn_v2_remote,
vm, rmt_ip_addr_list, dest_host):
# Staged
vsmsd = conn_v2_local.query("select * from "
"Msvm_VirtualSystemMigrationSettingData "
"where MigrationType = 32770")[0]
vsmsd.DestinationIPAddressList = rmt_ip_addr_list
migration_setting_data = vsmsd.GetText_(1)
LOG.debug(_("Creating remote planned VM for VM: %s"),
vm.ElementName)
migr_svc = conn_v2_local.Msvm_VirtualSystemMigrationService()[0]
(job_path, ret_val) = migr_svc.MigrateVirtualSystemToHost(
ComputerSystem=vm.path_(),
DestinationHost=dest_host,
MigrationSettingData=migration_setting_data)
self._vmutils.check_ret_val(ret_val, job_path)
return conn_v2_remote.Msvm_PlannedComputerSystem(Name=vm.Name)[0]
def _get_physical_disk_paths(self, vm_name):
ide_ctrl_path = self._vmutils.get_vm_ide_controller(vm_name, 0)
ide_paths = self._vmutils.get_controller_volume_paths(ide_ctrl_path)
scsi_ctrl_path = self._vmutils.get_vm_scsi_controller(vm_name)
scsi_paths = self._vmutils.get_controller_volume_paths(scsi_ctrl_path)
return dict(ide_paths.items() + scsi_paths.items())
def _get_remote_disk_data(self, vmutils_remote, disk_paths, dest_host):
volutils_remote = volumeutilsv2.VolumeUtilsV2(dest_host)
disk_paths_remote = {}
iscsi_targets = []
for (rasd_rel_path, disk_path) in disk_paths.items():
(target_iqn,
target_lun) = self._volutils.get_target_from_disk_path(disk_path)
iscsi_targets.append((target_iqn, target_lun))
dev_num = volutils_remote.get_device_number_for_target(target_iqn,
target_lun)
disk_path_remote = vmutils_remote.get_mounted_disk_by_drive_number(
dev_num)
disk_paths_remote[rasd_rel_path] = disk_path_remote
return (disk_paths_remote, iscsi_targets)
def _update_planned_vm_disk_resources(self, vmutils_remote, conn_v2_remote,
planned_vm, vm_name,
disk_paths_remote):
vm_settings = planned_vm.associators(
wmi_association_class='Msvm_SettingsDefineState',
wmi_result_class='Msvm_VirtualSystemSettingData')[0]
updated_resource_setting_data = []
sasds = vm_settings.associators(
wmi_association_class='Msvm_VirtualSystemSettingDataComponent')
for sasd in sasds:
if (sasd.ResourceType == 17 and sasd.ResourceSubType ==
"Microsoft:Hyper-V:Physical Disk Drive" and
sasd.HostResource):
# Replace the local disk target with the correct remote one
old_disk_path = sasd.HostResource[0]
new_disk_path = disk_paths_remote.pop(sasd.path().RelPath)
LOG.debug(_("Replacing host resource "
"%(old_disk_path)s with "
"%(new_disk_path)s on planned VM %(vm_name)s") %
locals())
sasd.HostResource = [new_disk_path]
updated_resource_setting_data.append(sasd.GetText_(1))
LOG.debug(_("Updating remote planned VM disk paths for VM: %s"),
vm_name)
vsmsvc = conn_v2_remote.Msvm_VirtualSystemManagementService()[0]
(res_settings, job_path, ret_val) = vsmsvc.ModifyResourceSettings(
ResourceSettings=updated_resource_setting_data)
vmutils_remote.check_ret_val(ret_val, job_path)
def _get_vhd_setting_data(self, vm):
vm_settings = vm.associators(
wmi_association_class='Msvm_SettingsDefineState',
wmi_result_class='Msvm_VirtualSystemSettingData')[0]
new_resource_setting_data = []
sasds = vm_settings.associators(
wmi_association_class='Msvm_VirtualSystemSettingDataComponent',
wmi_result_class='Msvm_StorageAllocationSettingData')
for sasd in sasds:
if (sasd.ResourceType == 31 and sasd.ResourceSubType ==
"Microsoft:Hyper-V:Virtual Hard Disk"):
#sasd.PoolId = ""
new_resource_setting_data.append(sasd.GetText_(1))
return new_resource_setting_data
def _live_migrate_vm(self, conn_v2_local, vm, planned_vm, rmt_ip_addr_list,
new_resource_setting_data, dest_host):
# VirtualSystemAndStorage
vsmsd = conn_v2_local.query("select * from "
"Msvm_VirtualSystemMigrationSettingData "
"where MigrationType = 32771")[0]
vsmsd.DestinationIPAddressList = rmt_ip_addr_list
if planned_vm:
vsmsd.DestinationPlannedVirtualSystemId = planned_vm.Name
migration_setting_data = vsmsd.GetText_(1)
migr_svc = conn_v2_local.Msvm_VirtualSystemMigrationService()[0]
LOG.debug(_("Starting live migration for VM: %s"), vm.ElementName)
(job_path, ret_val) = migr_svc.MigrateVirtualSystemToHost(
ComputerSystem=vm.path_(),
DestinationHost=dest_host,
MigrationSettingData=migration_setting_data,
NewResourceSettingData=new_resource_setting_data)
self._vmutils.check_ret_val(ret_val, job_path)
def _get_remote_ip_address_list(self, conn_v2_remote, dest_host):
LOG.debug(_("Getting live migration networks for remote host: %s"),
dest_host)
migr_svc_rmt = conn_v2_remote.Msvm_VirtualSystemMigrationService()[0]
return migr_svc_rmt.MigrationServiceListenerIPAddressList
def live_migrate_vm(self, vm_name, dest_host):
self.check_live_migration_config()
conn_v2_local = self._get_conn_v2()
conn_v2_remote = self._get_conn_v2(dest_host)
vm = self._get_vm(conn_v2_local, vm_name)
self._check_existing_planned_vm(conn_v2_remote, vm)
rmt_ip_addr_list = self._get_remote_ip_address_list(conn_v2_remote,
dest_host)
iscsi_targets = []
planned_vm = None
disk_paths = self._get_physical_disk_paths(vm_name)
if disk_paths:
vmutils_remote = vmutils.VMUtils(dest_host)
(disk_paths_remote,
iscsi_targets) = self._get_remote_disk_data(vmutils_remote,
disk_paths,
dest_host)
planned_vm = self._create_remote_planned_vm(conn_v2_local,
conn_v2_remote,
vm, rmt_ip_addr_list,
dest_host)
self._update_planned_vm_disk_resources(vmutils_remote,
conn_v2_remote, planned_vm,
vm_name, disk_paths_remote)
new_resource_setting_data = self._get_vhd_setting_data(vm)
self._live_migrate_vm(conn_v2_local, vm, planned_vm, rmt_ip_addr_list,
new_resource_setting_data, dest_host)
# In case the caller wants to log off the targets after migration
return iscsi_targets
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