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driver.py
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driver.py
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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Copyright (c) 2010 Citrix Systems, Inc.
# Copyright (c) 2011 Piston Cloud Computing, Inc
# Copyright (c) 2012 University Of Minho
# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
#
# 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.
"""
A connection to a hypervisor through libvirt.
Supports KVM, LXC, QEMU, UML, XEN and Parallels.
"""
import collections
from collections import deque
import contextlib
import errno
import functools
import glob
import itertools
import operator
import os
import pwd
import shutil
import tempfile
import time
import uuid
from castellan import key_manager
import eventlet
from eventlet import greenthread
from eventlet import tpool
from lxml import etree
from os_brick import encryptors
from os_brick import exception as brick_exception
from os_brick.initiator import connector
from oslo_concurrency import processutils
from oslo_log import log as logging
from oslo_serialization import jsonutils
from oslo_service import loopingcall
from oslo_utils import encodeutils
from oslo_utils import excutils
from oslo_utils import fileutils
from oslo_utils import importutils
from oslo_utils import strutils
from oslo_utils import timeutils
from oslo_utils import units
from oslo_utils import uuidutils
import six
from six.moves import range
from nova.api.metadata import base as instance_metadata
from nova import block_device
from nova.compute import power_state
from nova.compute import task_states
from nova.compute import utils as compute_utils
import nova.conf
from nova.console import serial as serial_console
from nova.console import type as ctype
from nova import context as nova_context
from nova import exception
from nova.i18n import _
from nova import image
from nova.network import model as network_model
from nova import objects
from nova.objects import diagnostics as diagnostics_obj
from nova.objects import fields
from nova.objects import migrate_data as migrate_data_obj
from nova.pci import manager as pci_manager
from nova.pci import utils as pci_utils
import nova.privsep.libvirt
import nova.privsep.path
from nova import utils
from nova import version
from nova.virt import block_device as driver_block_device
from nova.virt import configdrive
from nova.virt.disk import api as disk_api
from nova.virt.disk.vfs import guestfs
from nova.virt import driver
from nova.virt import firewall
from nova.virt import hardware
from nova.virt.image import model as imgmodel
from nova.virt import images
from nova.virt.libvirt import blockinfo
from nova.virt.libvirt import config as vconfig
from nova.virt.libvirt import firewall as libvirt_firewall
from nova.virt.libvirt import guest as libvirt_guest
from nova.virt.libvirt import host
from nova.virt.libvirt import imagebackend
from nova.virt.libvirt import imagecache
from nova.virt.libvirt import instancejobtracker
from nova.virt.libvirt import migration as libvirt_migrate
from nova.virt.libvirt.storage import dmcrypt
from nova.virt.libvirt.storage import lvm
from nova.virt.libvirt.storage import rbd_utils
from nova.virt.libvirt import utils as libvirt_utils
from nova.virt.libvirt import vif as libvirt_vif
from nova.virt.libvirt.volume import mount
from nova.virt.libvirt.volume import remotefs
from nova.virt import netutils
from nova.volume import cinder
libvirt = None
uefi_logged = False
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
DEFAULT_FIREWALL_DRIVER = "%s.%s" % (
libvirt_firewall.__name__,
libvirt_firewall.IptablesFirewallDriver.__name__)
DEFAULT_UEFI_LOADER_PATH = {
"x86_64": "/usr/share/OVMF/OVMF_CODE.fd",
"aarch64": "/usr/share/AAVMF/AAVMF_CODE.fd"
}
MAX_CONSOLE_BYTES = 100 * units.Ki
# The libvirt driver will prefix any disable reason codes with this string.
DISABLE_PREFIX = 'AUTO: '
# Disable reason for the service which was enabled or disabled without reason
DISABLE_REASON_UNDEFINED = None
# Guest config console string
CONSOLE = "console=tty0 console=ttyS0 console=hvc0"
GuestNumaConfig = collections.namedtuple(
'GuestNumaConfig', ['cpuset', 'cputune', 'numaconfig', 'numatune'])
InjectionInfo = collections.namedtuple(
'InjectionInfo', ['network_info', 'files', 'admin_pass'])
libvirt_volume_drivers = [
'iscsi=nova.virt.libvirt.volume.iscsi.LibvirtISCSIVolumeDriver',
'iser=nova.virt.libvirt.volume.iser.LibvirtISERVolumeDriver',
'local=nova.virt.libvirt.volume.volume.LibvirtVolumeDriver',
'drbd=nova.virt.libvirt.volume.drbd.LibvirtDRBDVolumeDriver',
'fake=nova.virt.libvirt.volume.volume.LibvirtFakeVolumeDriver',
'rbd=nova.virt.libvirt.volume.net.LibvirtNetVolumeDriver',
'sheepdog=nova.virt.libvirt.volume.net.LibvirtNetVolumeDriver',
'nfs=nova.virt.libvirt.volume.nfs.LibvirtNFSVolumeDriver',
'smbfs=nova.virt.libvirt.volume.smbfs.LibvirtSMBFSVolumeDriver',
'aoe=nova.virt.libvirt.volume.aoe.LibvirtAOEVolumeDriver',
'fibre_channel='
'nova.virt.libvirt.volume.fibrechannel.'
'LibvirtFibreChannelVolumeDriver',
'gpfs=nova.virt.libvirt.volume.gpfs.LibvirtGPFSVolumeDriver',
'quobyte=nova.virt.libvirt.volume.quobyte.LibvirtQuobyteVolumeDriver',
'hgst=nova.virt.libvirt.volume.hgst.LibvirtHGSTVolumeDriver',
'scaleio=nova.virt.libvirt.volume.scaleio.LibvirtScaleIOVolumeDriver',
'disco=nova.virt.libvirt.volume.disco.LibvirtDISCOVolumeDriver',
'vzstorage='
'nova.virt.libvirt.volume.vzstorage.LibvirtVZStorageVolumeDriver',
'veritas_hyperscale='
'nova.virt.libvirt.volume.vrtshyperscale.'
'LibvirtHyperScaleVolumeDriver',
]
def patch_tpool_proxy():
"""eventlet.tpool.Proxy doesn't work with old-style class in __str__()
or __repr__() calls. See bug #962840 for details.
We perform a monkey patch to replace those two instance methods.
"""
def str_method(self):
return str(self._obj)
def repr_method(self):
return repr(self._obj)
tpool.Proxy.__str__ = str_method
tpool.Proxy.__repr__ = repr_method
patch_tpool_proxy()
# For information about when MIN_LIBVIRT_VERSION and
# NEXT_MIN_LIBVIRT_VERSION can be changed, consult
#
# https://wiki.openstack.org/wiki/LibvirtDistroSupportMatrix
#
# Currently this is effectively the min version for i686/x86_64
# + KVM/QEMU, as other architectures/hypervisors require newer
# versions. Over time, this will become a common min version
# for all architectures/hypervisors, as this value rises to
# meet them.
MIN_LIBVIRT_VERSION = (1, 2, 9)
MIN_QEMU_VERSION = (2, 1, 0)
# TODO(berrange): Re-evaluate this at start of each release cycle
# to decide if we want to plan a future min version bump.
# MIN_LIBVIRT_VERSION can be updated to match this after
# NEXT_MIN_LIBVIRT_VERSION has been at a higher value for
# one cycle
NEXT_MIN_LIBVIRT_VERSION = (1, 3, 1)
NEXT_MIN_QEMU_VERSION = (2, 5, 0)
# When the above version matches/exceeds this version
# delete it & corresponding code using it
# Libvirt version 1.2.17 is required for successful block live migration
# of vm booted from image with attached devices
MIN_LIBVIRT_BLOCK_LM_WITH_VOLUMES_VERSION = (1, 2, 17)
# PowerPC based hosts that support NUMA using libvirt
MIN_LIBVIRT_NUMA_VERSION_PPC = (1, 2, 19)
# Versions of libvirt with known NUMA topology issues
# See bug #1449028
BAD_LIBVIRT_NUMA_VERSIONS = [(1, 2, 9, 2)]
# Versions of libvirt with broken cpu pinning support. This excludes
# versions of libvirt with broken NUMA support since pinning needs
# NUMA
# See bug #1438226
BAD_LIBVIRT_CPU_POLICY_VERSIONS = [(1, 2, 10)]
# Virtuozzo driver support
MIN_VIRTUOZZO_VERSION = (7, 0, 0)
MIN_LIBVIRT_VIRTUOZZO_VERSION = (1, 2, 12)
# Ability to set the user guest password with Qemu
MIN_LIBVIRT_SET_ADMIN_PASSWD = (1, 2, 16)
# Ability to set the user guest password with parallels
MIN_LIBVIRT_PARALLELS_SET_ADMIN_PASSWD = (2, 0, 0)
# s/390 & s/390x architectures with KVM
MIN_LIBVIRT_KVM_S390_VERSION = (1, 2, 13)
MIN_QEMU_S390_VERSION = (2, 3, 0)
# libvirt < 1.3 reported virt_functions capability
# only when VFs are enabled.
# libvirt 1.3 fix f391889f4e942e22b9ef8ecca492de05106ce41e
MIN_LIBVIRT_PF_WITH_NO_VFS_CAP_VERSION = (1, 3, 0)
# Use the "logd" backend for handling stdout/stderr from QEMU processes.
MIN_LIBVIRT_VIRTLOGD = (1, 3, 3)
MIN_QEMU_VIRTLOGD = (2, 7, 0)
# ppc64/ppc64le architectures with KVM
# NOTE(rfolco): Same levels for Libvirt/Qemu on Big Endian and Little
# Endian giving the nuance around guest vs host architectures
MIN_LIBVIRT_KVM_PPC64_VERSION = (1, 2, 12)
# Names of the types that do not get compressed during migration
NO_COMPRESSION_TYPES = ('qcow2',)
# number of serial console limit
QEMU_MAX_SERIAL_PORTS = 4
# Qemu supports 4 serial consoles, we remove 1 because of the PTY one defined
ALLOWED_QEMU_SERIAL_PORTS = QEMU_MAX_SERIAL_PORTS - 1
# realtime support
MIN_LIBVIRT_REALTIME_VERSION = (1, 2, 13)
# libvirt postcopy support
MIN_LIBVIRT_POSTCOPY_VERSION = (1, 3, 3)
# qemu postcopy support
MIN_QEMU_POSTCOPY_VERSION = (2, 5, 0)
MIN_LIBVIRT_OTHER_ARCH = {
fields.Architecture.S390: MIN_LIBVIRT_KVM_S390_VERSION,
fields.Architecture.S390X: MIN_LIBVIRT_KVM_S390_VERSION,
fields.Architecture.PPC: MIN_LIBVIRT_KVM_PPC64_VERSION,
fields.Architecture.PPC64: MIN_LIBVIRT_KVM_PPC64_VERSION,
fields.Architecture.PPC64LE: MIN_LIBVIRT_KVM_PPC64_VERSION,
}
MIN_QEMU_OTHER_ARCH = {
fields.Architecture.S390: MIN_QEMU_S390_VERSION,
fields.Architecture.S390X: MIN_QEMU_S390_VERSION,
}
# perf events support
MIN_LIBVIRT_PERF_VERSION = (2, 0, 0)
LIBVIRT_PERF_EVENT_PREFIX = 'VIR_PERF_PARAM_'
PERF_EVENTS_CPU_FLAG_MAPPING = {'cmt': 'cmt',
'mbml': 'mbm_local',
'mbmt': 'mbm_total',
}
# Mediated devices support
MIN_LIBVIRT_MDEV_SUPPORT = (3, 4, 0)
# libvirt>=3.10 is required for volume multiattach if qemu<2.10.
# See https://bugzilla.redhat.com/show_bug.cgi?id=1378242
# for details.
MIN_LIBVIRT_MULTIATTACH = (3, 10, 0)
VGPU_RESOURCE_SEMAPHORE = "vgpu_resources"
class LibvirtDriver(driver.ComputeDriver):
capabilities = {
"has_imagecache": True,
"supports_recreate": True,
"supports_migrate_to_same_host": False,
"supports_attach_interface": True,
"supports_device_tagging": True,
"supports_tagged_attach_interface": True,
"supports_tagged_attach_volume": True,
"supports_extend_volume": True,
# Multiattach support is conditional on qemu and libvirt versions
# determined in init_host.
"supports_multiattach": False
}
def __init__(self, virtapi, read_only=False):
super(LibvirtDriver, self).__init__(virtapi)
global libvirt
if libvirt is None:
libvirt = importutils.import_module('libvirt')
libvirt_migrate.libvirt = libvirt
self._host = host.Host(self._uri(), read_only,
lifecycle_event_handler=self.emit_event,
conn_event_handler=self._handle_conn_event)
self._initiator = None
self._fc_wwnns = None
self._fc_wwpns = None
self._caps = None
self._supported_perf_events = []
self.firewall_driver = firewall.load_driver(
DEFAULT_FIREWALL_DRIVER,
host=self._host)
self.vif_driver = libvirt_vif.LibvirtGenericVIFDriver()
# TODO(mriedem): Long-term we should load up the volume drivers on
# demand as needed rather than doing this on startup, as there might
# be unsupported volume drivers in this list based on the underlying
# platform.
self.volume_drivers = self._get_volume_drivers()
self._disk_cachemode = None
self.image_cache_manager = imagecache.ImageCacheManager()
self.image_backend = imagebackend.Backend(CONF.use_cow_images)
self.disk_cachemodes = {}
self.valid_cachemodes = ["default",
"none",
"writethrough",
"writeback",
"directsync",
"unsafe",
]
self._conn_supports_start_paused = CONF.libvirt.virt_type in ('kvm',
'qemu')
for mode_str in CONF.libvirt.disk_cachemodes:
disk_type, sep, cache_mode = mode_str.partition('=')
if cache_mode not in self.valid_cachemodes:
LOG.warning('Invalid cachemode %(cache_mode)s specified '
'for disk type %(disk_type)s.',
{'cache_mode': cache_mode, 'disk_type': disk_type})
continue
self.disk_cachemodes[disk_type] = cache_mode
self._volume_api = cinder.API()
self._image_api = image.API()
sysinfo_serial_funcs = {
'none': lambda: None,
'hardware': self._get_host_sysinfo_serial_hardware,
'os': self._get_host_sysinfo_serial_os,
'auto': self._get_host_sysinfo_serial_auto,
}
self._sysinfo_serial_func = sysinfo_serial_funcs.get(
CONF.libvirt.sysinfo_serial)
self.job_tracker = instancejobtracker.InstanceJobTracker()
self._remotefs = remotefs.RemoteFilesystem()
self._live_migration_flags = self._block_migration_flags = 0
self.active_migrations = {}
# Compute reserved hugepages from conf file at the very
# beginning to ensure any syntax error will be reported and
# avoid any re-calculation when computing resources.
self._reserved_hugepages = hardware.numa_get_reserved_huge_pages()
def _get_volume_drivers(self):
driver_registry = dict()
for driver_str in libvirt_volume_drivers:
driver_type, _sep, driver = driver_str.partition('=')
driver_class = importutils.import_class(driver)
try:
driver_registry[driver_type] = driver_class(self._host)
except brick_exception.InvalidConnectorProtocol:
LOG.debug('Unable to load volume driver %s. It is not '
'supported on this host.', driver)
return driver_registry
@property
def disk_cachemode(self):
if self._disk_cachemode is None:
# We prefer 'none' for consistent performance, host crash
# safety & migration correctness by avoiding host page cache.
# Some filesystems don't support O_DIRECT though. For those we
# fallback to 'writethrough' which gives host crash safety, and
# is safe for migration provided the filesystem is cache coherent
# (cluster filesystems typically are, but things like NFS are not).
self._disk_cachemode = "none"
if not utils.supports_direct_io(CONF.instances_path):
self._disk_cachemode = "writethrough"
return self._disk_cachemode
def _set_cache_mode(self, conf):
"""Set cache mode on LibvirtConfigGuestDisk object."""
try:
source_type = conf.source_type
driver_cache = conf.driver_cache
except AttributeError:
return
# Shareable disks like for a multi-attach volume need to have the
# driver cache disabled.
if getattr(conf, 'shareable', False):
conf.driver_cache = 'none'
else:
cache_mode = self.disk_cachemodes.get(source_type,
driver_cache)
conf.driver_cache = cache_mode
def _do_quality_warnings(self):
"""Warn about untested driver configurations.
This will log a warning message about untested driver or host arch
configurations to indicate to administrators that the quality is
unknown. Currently, only qemu or kvm on intel 32- or 64-bit systems
is tested upstream.
"""
caps = self._host.get_capabilities()
hostarch = caps.host.cpu.arch
if (CONF.libvirt.virt_type not in ('qemu', 'kvm') or
hostarch not in (fields.Architecture.I686,
fields.Architecture.X86_64)):
LOG.warning('The libvirt driver is not tested on '
'%(type)s/%(arch)s by the OpenStack project and '
'thus its quality can not be ensured. For more '
'information, see: https://docs.openstack.org/'
'nova/latest/user/support-matrix.html',
{'type': CONF.libvirt.virt_type, 'arch': hostarch})
def _handle_conn_event(self, enabled, reason):
LOG.info("Connection event '%(enabled)d' reason '%(reason)s'",
{'enabled': enabled, 'reason': reason})
self._set_host_enabled(enabled, reason)
def _version_to_string(self, version):
return '.'.join([str(x) for x in version])
def init_host(self, host):
self._host.initialize()
self._do_quality_warnings()
self._parse_migration_flags()
self._supported_perf_events = self._get_supported_perf_events()
self._set_multiattach_support()
if (CONF.libvirt.virt_type == 'lxc' and
not (CONF.libvirt.uid_maps and CONF.libvirt.gid_maps)):
LOG.warning("Running libvirt-lxc without user namespaces is "
"dangerous. Containers spawned by Nova will be run "
"as the host's root user. It is highly suggested "
"that user namespaces be used in a public or "
"multi-tenant environment.")
# Stop libguestfs using KVM unless we're also configured
# to use this. This solves problem where people need to
# stop Nova use of KVM because nested-virt is broken
if CONF.libvirt.virt_type != "kvm":
guestfs.force_tcg()
if not self._host.has_min_version(MIN_LIBVIRT_VERSION):
raise exception.InternalError(
_('Nova requires libvirt version %s or greater.') %
self._version_to_string(MIN_LIBVIRT_VERSION))
if CONF.libvirt.virt_type in ("qemu", "kvm"):
if self._host.has_min_version(hv_ver=MIN_QEMU_VERSION):
# "qemu-img info" calls are version dependent, so we need to
# store the version in the images module.
images.QEMU_VERSION = self._host.get_connection().getVersion()
else:
raise exception.InternalError(
_('Nova requires QEMU version %s or greater.') %
self._version_to_string(MIN_QEMU_VERSION))
if CONF.libvirt.virt_type == 'parallels':
if not self._host.has_min_version(hv_ver=MIN_VIRTUOZZO_VERSION):
raise exception.InternalError(
_('Nova requires Virtuozzo version %s or greater.') %
self._version_to_string(MIN_VIRTUOZZO_VERSION))
if not self._host.has_min_version(MIN_LIBVIRT_VIRTUOZZO_VERSION):
raise exception.InternalError(
_('Running Nova with parallels virt_type requires '
'libvirt version %s') %
self._version_to_string(MIN_LIBVIRT_VIRTUOZZO_VERSION))
# Give the cloud admin a heads up if we are intending to
# change the MIN_LIBVIRT_VERSION in the next release.
if not self._host.has_min_version(NEXT_MIN_LIBVIRT_VERSION):
LOG.warning('Running Nova with a libvirt version less than '
'%(version)s is deprecated. The required minimum '
'version of libvirt will be raised to %(version)s '
'in the next release.',
{'version': self._version_to_string(
NEXT_MIN_LIBVIRT_VERSION)})
if (CONF.libvirt.virt_type in ("qemu", "kvm") and
not self._host.has_min_version(hv_ver=NEXT_MIN_QEMU_VERSION)):
LOG.warning('Running Nova with a QEMU version less than '
'%(version)s is deprecated. The required minimum '
'version of QEMU will be raised to %(version)s '
'in the next release.',
{'version': self._version_to_string(
NEXT_MIN_QEMU_VERSION)})
kvm_arch = fields.Architecture.from_host()
if (CONF.libvirt.virt_type in ('kvm', 'qemu') and
kvm_arch in MIN_LIBVIRT_OTHER_ARCH and
not self._host.has_min_version(
MIN_LIBVIRT_OTHER_ARCH.get(kvm_arch),
MIN_QEMU_OTHER_ARCH.get(kvm_arch))):
if MIN_QEMU_OTHER_ARCH.get(kvm_arch):
raise exception.InternalError(
_('Running Nova with qemu/kvm virt_type on %(arch)s '
'requires libvirt version %(libvirt_ver)s and '
'qemu version %(qemu_ver)s, or greater') %
{'arch': kvm_arch,
'libvirt_ver': self._version_to_string(
MIN_LIBVIRT_OTHER_ARCH.get(kvm_arch)),
'qemu_ver': self._version_to_string(
MIN_QEMU_OTHER_ARCH.get(kvm_arch))})
# no qemu version in the error message
raise exception.InternalError(
_('Running Nova with qemu/kvm virt_type on %(arch)s '
'requires libvirt version %(libvirt_ver)s or greater') %
{'arch': kvm_arch,
'libvirt_ver': self._version_to_string(
MIN_LIBVIRT_OTHER_ARCH.get(kvm_arch))})
# TODO(sbauza): Remove this code once mediated devices are persisted
# across reboots.
if self._host.has_min_version(MIN_LIBVIRT_MDEV_SUPPORT):
self._recreate_assigned_mediated_devices()
@staticmethod
def _is_existing_mdev(uuid):
# FIXME(sbauza): Some kernel can have a uevent race meaning that the
# libvirt daemon won't know when a mediated device is created unless
# you restart that daemon. Until all kernels we support are not having
# that possible race, check the sysfs directly instead of asking the
# libvirt API.
# See https://bugzilla.redhat.com/show_bug.cgi?id=1376907 for ref.
return os.path.exists('/sys/bus/mdev/devices/{0}'.format(uuid))
def _recreate_assigned_mediated_devices(self):
"""Recreate assigned mdevs that could have disappeared if we reboot
the host.
"""
mdevs = self._get_all_assigned_mediated_devices()
requested_types = self._get_supported_vgpu_types()
for (mdev_uuid, instance_uuid) in six.iteritems(mdevs):
if not self._is_existing_mdev(mdev_uuid):
self._create_new_mediated_device(requested_types, mdev_uuid)
def _set_multiattach_support(self):
# Check to see if multiattach is supported. Based on bugzilla
# https://bugzilla.redhat.com/show_bug.cgi?id=1378242 and related
# clones, the shareable flag on a disk device will only work with
# qemu<2.10 or libvirt>=3.10. So check those versions here and set
# the capability appropriately.
if (self._host.has_min_version(lv_ver=MIN_LIBVIRT_MULTIATTACH) or
not self._host.has_min_version(hv_ver=(2, 10, 0))):
self.capabilities['supports_multiattach'] = True
else:
LOG.debug('Volume multiattach is not supported based on current '
'versions of QEMU and libvirt. QEMU must be less than '
'2.10 or libvirt must be greater than or equal to 3.10.')
def _prepare_migration_flags(self):
migration_flags = 0
migration_flags |= libvirt.VIR_MIGRATE_LIVE
# Adding p2p flag only if xen is not in use, because xen does not
# support p2p migrations
if CONF.libvirt.virt_type != 'xen':
migration_flags |= libvirt.VIR_MIGRATE_PEER2PEER
# Adding VIR_MIGRATE_UNDEFINE_SOURCE because, without it, migrated
# instance will remain defined on the source host
migration_flags |= libvirt.VIR_MIGRATE_UNDEFINE_SOURCE
# Adding VIR_MIGRATE_PERSIST_DEST to persist the VM on the
# destination host
migration_flags |= libvirt.VIR_MIGRATE_PERSIST_DEST
live_migration_flags = block_migration_flags = migration_flags
# Adding VIR_MIGRATE_NON_SHARED_INC, otherwise all block-migrations
# will be live-migrations instead
block_migration_flags |= libvirt.VIR_MIGRATE_NON_SHARED_INC
return (live_migration_flags, block_migration_flags)
def _handle_live_migration_tunnelled(self, migration_flags):
if (CONF.libvirt.live_migration_tunnelled is None or
CONF.libvirt.live_migration_tunnelled):
migration_flags |= libvirt.VIR_MIGRATE_TUNNELLED
return migration_flags
def _is_post_copy_available(self):
if self._host.has_min_version(lv_ver=MIN_LIBVIRT_POSTCOPY_VERSION,
hv_ver=MIN_QEMU_POSTCOPY_VERSION):
return True
return False
def _is_virtlogd_available(self):
return self._host.has_min_version(MIN_LIBVIRT_VIRTLOGD,
MIN_QEMU_VIRTLOGD)
def _handle_live_migration_post_copy(self, migration_flags):
if CONF.libvirt.live_migration_permit_post_copy:
if self._is_post_copy_available():
migration_flags |= libvirt.VIR_MIGRATE_POSTCOPY
else:
LOG.info('The live_migration_permit_post_copy is set '
'to True, but it is not supported.')
return migration_flags
def _handle_live_migration_auto_converge(self, migration_flags):
if (self._is_post_copy_available() and
(migration_flags & libvirt.VIR_MIGRATE_POSTCOPY) != 0):
LOG.info('The live_migration_permit_post_copy is set to '
'True and post copy live migration is available '
'so auto-converge will not be in use.')
elif CONF.libvirt.live_migration_permit_auto_converge:
migration_flags |= libvirt.VIR_MIGRATE_AUTO_CONVERGE
return migration_flags
def _parse_migration_flags(self):
(live_migration_flags,
block_migration_flags) = self._prepare_migration_flags()
live_migration_flags = self._handle_live_migration_tunnelled(
live_migration_flags)
block_migration_flags = self._handle_live_migration_tunnelled(
block_migration_flags)
live_migration_flags = self._handle_live_migration_post_copy(
live_migration_flags)
block_migration_flags = self._handle_live_migration_post_copy(
block_migration_flags)
live_migration_flags = self._handle_live_migration_auto_converge(
live_migration_flags)
block_migration_flags = self._handle_live_migration_auto_converge(
block_migration_flags)
self._live_migration_flags = live_migration_flags
self._block_migration_flags = block_migration_flags
# TODO(sahid): This method is targeted for removal when the tests
# have been updated to avoid its use
#
# All libvirt API calls on the libvirt.Connect object should be
# encapsulated by methods on the nova.virt.libvirt.host.Host
# object, rather than directly invoking the libvirt APIs. The goal
# is to avoid a direct dependency on the libvirt API from the
# driver.py file.
def _get_connection(self):
return self._host.get_connection()
_conn = property(_get_connection)
@staticmethod
def _uri():
if CONF.libvirt.virt_type == 'uml':
uri = CONF.libvirt.connection_uri or 'uml:///system'
elif CONF.libvirt.virt_type == 'xen':
uri = CONF.libvirt.connection_uri or 'xen:///'
elif CONF.libvirt.virt_type == 'lxc':
uri = CONF.libvirt.connection_uri or 'lxc:///'
elif CONF.libvirt.virt_type == 'parallels':
uri = CONF.libvirt.connection_uri or 'parallels:///system'
else:
uri = CONF.libvirt.connection_uri or 'qemu:///system'
return uri
@staticmethod
def _live_migration_uri(dest):
uris = {
'kvm': 'qemu+%s://%s/system',
'qemu': 'qemu+%s://%s/system',
'xen': 'xenmigr://%s/system',
'parallels': 'parallels+tcp://%s/system',
}
virt_type = CONF.libvirt.virt_type
# TODO(pkoniszewski): Remove fetching live_migration_uri in Pike
uri = CONF.libvirt.live_migration_uri
if uri:
return uri % dest
uri = uris.get(virt_type)
if uri is None:
raise exception.LiveMigrationURINotAvailable(virt_type=virt_type)
str_format = (dest,)
if virt_type in ('kvm', 'qemu'):
scheme = CONF.libvirt.live_migration_scheme or 'tcp'
str_format = (scheme, dest)
return uris.get(virt_type) % str_format
@staticmethod
def _migrate_uri(dest):
uri = None
# Only QEMU live migrations supports migrate-uri parameter
virt_type = CONF.libvirt.virt_type
if virt_type in ('qemu', 'kvm'):
# QEMU accept two schemes: tcp and rdma. By default
# libvirt build the URI using the remote hostname and the
# tcp schema.
uri = 'tcp://%s' % dest
# Because dest might be of type unicode, here we might return value of
# type unicode as well which is not acceptable by libvirt python
# binding when Python 2.7 is in use, so let's convert it explicitly
# back to string. When Python 3.x is in use, libvirt python binding
# accepts unicode type so it is completely fine to do a no-op str(uri)
# conversion which will return value of type unicode.
return uri and str(uri)
def instance_exists(self, instance):
"""Efficient override of base instance_exists method."""
try:
self._host.get_guest(instance)
return True
except (exception.InternalError, exception.InstanceNotFound):
return False
def estimate_instance_overhead(self, instance_info):
overhead = super(LibvirtDriver, self).estimate_instance_overhead(
instance_info)
if isinstance(instance_info, objects.Flavor):
# A flavor object is passed during case of migrate
# TODO(sahid): We do not have any way to retrieve the
# image meta related to the instance so if the cpu_policy
# has been set in image_meta we will get an
# exception. Until we fix it we specifically set the
# cpu_policy in dedicated in an ImageMeta object so if the
# emulator threads has been requested nothing is going to
# fail.
image_meta = objects.ImageMeta.from_dict({"properties": {
"hw_cpu_policy": fields.CPUAllocationPolicy.DEDICATED,
}})
if (hardware.get_emulator_threads_constraint(
instance_info, image_meta)
== fields.CPUEmulatorThreadsPolicy.ISOLATE):
overhead['vcpus'] += 1
else:
# An instance object is passed during case of spawing or a
# dict is passed when computing resource for an instance
numa_topology = hardware.instance_topology_from_instance(
instance_info)
if numa_topology and numa_topology.emulator_threads_isolated:
overhead['vcpus'] += 1
return overhead
def list_instances(self):
names = []
for guest in self._host.list_guests(only_running=False):
names.append(guest.name)
return names
def list_instance_uuids(self):
uuids = []
for guest in self._host.list_guests(only_running=False):
uuids.append(guest.uuid)
return uuids
def plug_vifs(self, instance, network_info):
"""Plug VIFs into networks."""
for vif in network_info:
self.vif_driver.plug(instance, vif)
def _unplug_vifs(self, instance, network_info, ignore_errors):
"""Unplug VIFs from networks."""
for vif in network_info:
try:
self.vif_driver.unplug(instance, vif)
except exception.NovaException:
if not ignore_errors:
raise
def unplug_vifs(self, instance, network_info):
self._unplug_vifs(instance, network_info, False)
def _teardown_container(self, instance):
inst_path = libvirt_utils.get_instance_path(instance)
container_dir = os.path.join(inst_path, 'rootfs')
rootfs_dev = instance.system_metadata.get('rootfs_device_name')
LOG.debug('Attempting to teardown container at path %(dir)s with '
'root device: %(rootfs_dev)s',
{'dir': container_dir, 'rootfs_dev': rootfs_dev},
instance=instance)
disk_api.teardown_container(container_dir, rootfs_dev)
def _destroy(self, instance, attempt=1):
try:
guest = self._host.get_guest(instance)
if CONF.serial_console.enabled:
# This method is called for several events: destroy,
# rebuild, hard-reboot, power-off - For all of these
# events we want to release the serial ports acquired
# for the guest before destroying it.
serials = self._get_serial_ports_from_guest(guest)
for hostname, port in serials:
serial_console.release_port(host=hostname, port=port)
except exception.InstanceNotFound:
guest = None
# If the instance is already terminated, we're still happy
# Otherwise, destroy it
old_domid = -1
if guest is not None:
try:
old_domid = guest.id
guest.poweroff()
except libvirt.libvirtError as e:
is_okay = False
errcode = e.get_error_code()
if errcode == libvirt.VIR_ERR_NO_DOMAIN:
# Domain already gone. This can safely be ignored.
is_okay = True
elif errcode == libvirt.VIR_ERR_OPERATION_INVALID:
# If the instance is already shut off, we get this:
# Code=55 Error=Requested operation is not valid:
# domain is not running
state = guest.get_power_state(self._host)
if state == power_state.SHUTDOWN:
is_okay = True
elif errcode == libvirt.VIR_ERR_INTERNAL_ERROR:
errmsg = e.get_error_message()
if (CONF.libvirt.virt_type == 'lxc' and
errmsg == 'internal error: '
'Some processes refused to die'):
# Some processes in the container didn't die
# fast enough for libvirt. The container will
# eventually die. For now, move on and let
# the wait_for_destroy logic take over.
is_okay = True
elif errcode == libvirt.VIR_ERR_OPERATION_TIMEOUT:
LOG.warning("Cannot destroy instance, operation time out",
instance=instance)
reason = _("operation time out")
raise exception.InstancePowerOffFailure(reason=reason)
elif errcode == libvirt.VIR_ERR_SYSTEM_ERROR:
if e.get_int1() == errno.EBUSY:
# NOTE(danpb): When libvirt kills a process it sends it
# SIGTERM first and waits 10 seconds. If it hasn't gone
# it sends SIGKILL and waits another 5 seconds. If it
# still hasn't gone then you get this EBUSY error.
# Usually when a QEMU process fails to go away upon
# SIGKILL it is because it is stuck in an
# uninterruptible kernel sleep waiting on I/O from
# some non-responsive server.
# Given the CPU load of the gate tests though, it is
# conceivable that the 15 second timeout is too short,
# particularly if the VM running tempest has a high
# steal time from the cloud host. ie 15 wallclock
# seconds may have passed, but the VM might have only
# have a few seconds of scheduled run time.
LOG.warning('Error from libvirt during destroy. '
'Code=%(errcode)s Error=%(e)s; '
'attempt %(attempt)d of 3',
{'errcode': errcode, 'e': e,
'attempt': attempt},
instance=instance)
with excutils.save_and_reraise_exception() as ctxt:
# Try up to 3 times before giving up.
if attempt < 3:
ctxt.reraise = False
self._destroy(instance, attempt + 1)
return
if not is_okay:
with excutils.save_and_reraise_exception():
LOG.error('Error from libvirt during destroy. '
'Code=%(errcode)s Error=%(e)s',
{'errcode': errcode, 'e': e},
instance=instance)
def _wait_for_destroy(expected_domid):
"""Called at an interval until the VM is gone."""
# NOTE(vish): If the instance disappears during the destroy
# we ignore it so the cleanup can still be
# attempted because we would prefer destroy to
# never fail.
try:
dom_info = self.get_info(instance)
state = dom_info.state
new_domid = dom_info.internal_id
except exception.InstanceNotFound:
LOG.debug("During wait destroy, instance disappeared.",
instance=instance)
state = power_state.SHUTDOWN
if state == power_state.SHUTDOWN:
LOG.info("Instance destroyed successfully.", instance=instance)
raise loopingcall.LoopingCallDone()
# NOTE(wangpan): If the instance was booted again after destroy,
# this may be an endless loop, so check the id of
# domain here, if it changed and the instance is
# still running, we should destroy it again.
# see https://bugs.launchpad.net/nova/+bug/1111213 for more details
if new_domid != expected_domid:
LOG.info("Instance may be started again.", instance=instance)
kwargs['is_running'] = True
raise loopingcall.LoopingCallDone()
kwargs = {'is_running': False}
timer = loopingcall.FixedIntervalLoopingCall(_wait_for_destroy,
old_domid)
timer.start(interval=0.5).wait()
if kwargs['is_running']:
LOG.info("Going to destroy instance again.", instance=instance)
self._destroy(instance)
else:
# NOTE(GuanQiang): teardown container to avoid resource leak
if CONF.libvirt.virt_type == 'lxc':
self._teardown_container(instance)
def destroy(self, context, instance, network_info, block_device_info=None,
destroy_disks=True):
self._destroy(instance)
self.cleanup(context, instance, network_info, block_device_info,
destroy_disks)
def _undefine_domain(self, instance):
try:
guest = self._host.get_guest(instance)
try:
support_uefi = self._has_uefi_support()
guest.delete_configuration(support_uefi)
except libvirt.libvirtError as e:
with excutils.save_and_reraise_exception() as ctxt:
errcode = e.get_error_code()
if errcode == libvirt.VIR_ERR_NO_DOMAIN:
LOG.debug("Called undefine, but domain already gone.",
instance=instance)
ctxt.reraise = False
else:
LOG.error('Error from libvirt during undefine. '
'Code=%(errcode)s Error=%(e)s',
{'errcode': errcode,
'e': encodeutils.exception_to_unicode(e)},
instance=instance)
except exception.InstanceNotFound:
pass
def cleanup(self, context, instance, network_info, block_device_info=None,
destroy_disks=True, migrate_data=None, destroy_vifs=True):
if destroy_vifs:
self._unplug_vifs(instance, network_info, True)
# Continue attempting to remove firewall filters for the instance
# until it's done or there is a failure to remove the filters. If
# unfilter fails because the instance is not yet shutdown, try to
# destroy the guest again and then retry the unfilter.