/
driver.py
10656 lines (9262 loc) · 479 KB
/
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 binascii
import collections
from collections import deque
import contextlib
import copy
import errno
import functools
import glob
import itertools
import operator
import os
import pwd
import random
import shutil
import tempfile
import time
import uuid
from castellan import key_manager
from copy import deepcopy
import eventlet
from eventlet import greenthread
from eventlet import tpool
from lxml import etree
from os_brick import encryptors
from os_brick.encryptors import luks as luks_encryptor
from os_brick import exception as brick_exception
from os_brick.initiator import connector
import os_resource_classes as orc
import os_traits as ot
from oslo_concurrency import processutils
from oslo_log import log as logging
from oslo_serialization import base64
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 netutils as oslo_netutils
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.api.metadata import password
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
from nova.compute import vm_states
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 crypto
from nova.db import constants as db_const
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.pci import manager as pci_manager
from nova.pci import utils as pci_utils
import nova.privsep.libvirt
import nova.privsep.path
import nova.privsep.utils
from nova import utils
from nova import version
from nova.virt import arch
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 designer
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',
'/usr/share/OVMF/OVMF_CODE.secboot.fd',
'/usr/share/qemu/ovmf-x86_64-code.bin'],
"aarch64": ['/usr/share/AAVMF/AAVMF_CODE.fd',
'/usr/share/qemu/aavmf-aarch64-code.bin']
}
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'])
class InjectionInfo(collections.namedtuple(
'InjectionInfo', ['network_info', 'files', 'admin_pass'])):
__slots__ = ()
def __repr__(self):
return ('InjectionInfo(network_info=%r, files=%r, '
'admin_pass=<SANITIZED>)') % (self.network_info, self.files)
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',
'storpool=nova.virt.libvirt.volume.storpool.LibvirtStorPoolVolumeDriver',
'nvmeof=nova.virt.libvirt.volume.nvme.LibvirtNVMEVolumeDriver',
]
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 = (3, 0, 0)
MIN_QEMU_VERSION = (2, 8, 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 = (4, 0, 0)
NEXT_MIN_QEMU_VERSION = (2, 11, 0)
# Virtuozzo driver support
MIN_VIRTUOZZO_VERSION = (7, 0, 0)
# aarch64 architecture with KVM
# 'chardev' support got sorted out in 3.6.0
MIN_LIBVIRT_KVM_AARCH64_VERSION = (3, 6, 0)
# 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
MIN_LIBVIRT_OTHER_ARCH = {
fields.Architecture.AARCH64: MIN_LIBVIRT_KVM_AARCH64_VERSION,
}
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 unless qemu<2.10.
# See https://bugzilla.redhat.com/show_bug.cgi?id=1378242
# for details.
MIN_LIBVIRT_MULTIATTACH = (3, 10, 0)
MIN_LIBVIRT_FILE_BACKED_VERSION = (4, 0, 0)
MIN_QEMU_FILE_BACKED_VERSION = (2, 6, 0)
MIN_LIBVIRT_FILE_BACKED_DISCARD_VERSION = (4, 4, 0)
MIN_QEMU_FILE_BACKED_DISCARD_VERSION = (2, 10, 0)
MIN_LIBVIRT_NATIVE_TLS_VERSION = (4, 4, 0)
MIN_QEMU_NATIVE_TLS_VERSION = (2, 11, 0)
# If the host has this libvirt version, then we skip the retry loop of
# instance destroy() call, as libvirt itself increased the wait time
# before the SIGKILL signal takes effect.
MIN_LIBVIRT_BETTER_SIGKILL_HANDLING = (4, 7, 0)
VGPU_RESOURCE_SEMAPHORE = "vgpu_resources"
# see https://libvirt.org/formatdomain.html#elementsVideo
MIN_LIBVIRT_VIDEO_MODEL_VERSIONS = {
fields.VideoModel.GOP: (3, 2, 0),
fields.VideoModel.NONE: (4, 6, 0),
}
# Persistent Memory (PMEM/NVDIMM) Device Support
MIN_LIBVIRT_PMEM_SUPPORT = (5, 0, 0)
MIN_QEMU_PMEM_SUPPORT = (3, 1, 0)
MIN_LIBVIRT_VIR_ERR_DEVICE_MISSING = (4, 1, 0)
class LibvirtDriver(driver.ComputeDriver):
def __init__(self, virtapi, read_only=False):
# NOTE(aspiers) Some of these are dynamic, so putting
# capabilities on the instance rather than on the class.
# This prevents the risk of one test setting a capability
# which bleeds over into other tests.
# LVM and RBD require raw images. If we are not configured to
# force convert images into raw format, then we _require_ raw
# images only.
raw_only = ('rbd', 'lvm')
requires_raw_image = (CONF.libvirt.images_type in raw_only and
not CONF.force_raw_images)
self.capabilities = {
"has_imagecache": True,
"supports_evacuate": 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,
"supports_trusted_certs": True,
# Supported image types
"supports_image_type_aki": True,
"supports_image_type_ari": True,
"supports_image_type_ami": True,
# FIXME(danms): I can see a future where people might want to
# configure certain compute nodes to not allow giant raw images
# to be booted (like nodes that are across a WAN). Thus, at some
# point we may want to be able to _not_ expose "supports raw" on
# some nodes by policy. Until then, raw is always supported.
"supports_image_type_raw": True,
"supports_image_type_iso": True,
# NOTE(danms): Certain backends do not work with complex image
# formats. If we are configured for those backends, then we
# should not expose the corresponding support traits.
"supports_image_type_qcow2": not requires_raw_image,
"supports_pcpus": True,
}
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._supported_perf_events = []
self.__has_hyperthreading = None
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()
# The default choice for the sysinfo_serial config option is "unique"
# which does not have a special function since the value is just the
# instance.uuid.
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()
# Copy of the compute service ProviderTree object that is updated
# every time update_provider_tree() is called.
# NOTE(sbauza): We only want a read-only cache, this attribute is not
# intended to be updatable directly
self.provider_tree = None
# The CPU models in the configuration are case-insensitive, but the CPU
# model in the libvirt is case-sensitive, therefore create a mapping to
# map the lower case CPU model name to normal CPU model name.
self.cpu_models_mapping = {}
self.cpu_model_flag_mapping = {}
self._vpmems_by_name, self._vpmems_by_rc = self._discover_vpmems(
vpmem_conf=CONF.libvirt.pmem_namespaces)
def _discover_vpmems(self, vpmem_conf=None):
"""Discover vpmems on host and configuration.
:param vpmem_conf: pmem namespaces configuration from CONF
:returns: a dict of vpmem keyed by name, and
a dict of vpmem list keyed by resource class
:raises: exception.InvalidConfiguration if Libvirt or QEMU version
does not meet requirement.
"""
if not vpmem_conf:
return {}, {}
if not self._host.has_min_version(lv_ver=MIN_LIBVIRT_PMEM_SUPPORT,
hv_ver=MIN_QEMU_PMEM_SUPPORT):
raise exception.InvalidConfiguration(
_('Nova requires QEMU version %(qemu)s or greater '
'and Libvirt version %(libvirt)s or greater '
'for NVDIMM (Persistent Memory) support.') % {
'qemu': libvirt_utils.version_to_string(
MIN_QEMU_PMEM_SUPPORT),
'libvirt': libvirt_utils.version_to_string(
MIN_LIBVIRT_PMEM_SUPPORT)})
# vpmem keyed by name {name: objects.LibvirtVPMEMDevice,...}
vpmems_by_name = {}
# vpmem list keyed by resource class
# {'RC_0': [objects.LibvirtVPMEMDevice, ...], 'RC_1': [...]}
vpmems_by_rc = collections.defaultdict(list)
vpmems_host = self._get_vpmems_on_host()
for ns_conf in vpmem_conf:
try:
ns_label, ns_names = ns_conf.split(":", 1)
except ValueError:
reason = _("The configuration doesn't follow the format")
raise exception.PMEMNamespaceConfigInvalid(
reason=reason)
ns_names = ns_names.split("|")
for ns_name in ns_names:
if ns_name not in vpmems_host:
reason = _("The PMEM namespace %s isn't on host") % ns_name
raise exception.PMEMNamespaceConfigInvalid(
reason=reason)
if ns_name in vpmems_by_name:
reason = (_("Duplicated PMEM namespace %s configured") %
ns_name)
raise exception.PMEMNamespaceConfigInvalid(
reason=reason)
pmem_ns_updated = vpmems_host[ns_name]
pmem_ns_updated.label = ns_label
vpmems_by_name[ns_name] = pmem_ns_updated
rc = orc.normalize_name(
"PMEM_NAMESPACE_%s" % ns_label)
vpmems_by_rc[rc].append(pmem_ns_updated)
return vpmems_by_name, vpmems_by_rc
def _get_vpmems_on_host(self):
"""Get PMEM namespaces on host using ndctl utility."""
try:
output = nova.privsep.libvirt.get_pmem_namespaces()
except Exception as e:
reason = _("Get PMEM namespaces by ndctl utility, "
"please ensure ndctl is installed: %s") % e
raise exception.GetPMEMNamespacesFailed(reason=reason)
if not output:
return {}
namespaces = jsonutils.loads(output)
vpmems_host = {} # keyed by namespace name
for ns in namespaces:
# store namespace info parsed from ndctl utility return
if not ns.get('name'):
# The name is used to identify namespaces, it's optional
# config when creating namespace. If an namespace don't have
# name, it can not be used by Nova, we will skip it.
continue
vpmems_host[ns['name']] = objects.LibvirtVPMEMDevice(
name=ns['name'],
devpath= '/dev/' + ns['daxregion']['devices'][0]['chardev'],
size=ns['size'],
align=ns['daxregion']['align'])
return vpmems_host
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):
# It can be confusing to understand the QEMU cache mode
# behaviour, because each cache=$MODE is a convenient shorthand
# to toggle _three_ cache.* booleans. Consult the below table
# (quoting from the QEMU man page):
#
# | cache.writeback | cache.direct | cache.no-flush
# --------------------------------------------------------------
# writeback | on | off | off
# none | on | on | off
# writethrough | off | off | off
# directsync | off | on | off
# unsafe | on | off | on
#
# Where:
#
# - 'cache.writeback=off' means: QEMU adds an automatic fsync()
# after each write request.
#
# - 'cache.direct=on' means: Use Linux's O_DIRECT, i.e. bypass
# the kernel page cache. Caches in any other layer (disk
# cache, QEMU metadata caches, etc.) can still be present.
#
# - 'cache.no-flush=on' means: Ignore flush requests, i.e.
# never call fsync(), even if the guest explicitly requested
# it.
#
# Use cache mode "none" (cache.writeback=on, cache.direct=on,
# cache.no-flush=off) for consistent performance and
# migration correctness. Some filesystems don't support
# O_DIRECT, though. For those we fallback to the next
# reasonable option that is "writeback" (cache.writeback=on,
# cache.direct=off, cache.no-flush=off).
if self._disk_cachemode is None:
self._disk_cachemode = "none"
if not nova.privsep.utils.supports_direct_io(CONF.instances_path):
self._disk_cachemode = "writeback"
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
# NOTE(acewit): If the [libvirt]disk_cachemodes is set as
# `block=writeback` or `block=writethrough` or `block=unsafe`,
# whose correponding Linux's IO semantic is not O_DIRECT in
# file nova.conf, then it will result in an attachment failure
# because of the libvirt bug
# (https://bugzilla.redhat.com/show_bug.cgi?id=1086704)
if ((getattr(conf, 'driver_io', None) == "native") and
conf.driver_cache not in [None, 'none', 'directsync']):
conf.driver_io = "threads"
LOG.warning("The guest disk driver io mode has fallen back "
"from 'native' to 'threads' because the "
"disk cache mode is set as %(cachemode)s, which does"
"not use O_DIRECT. See the following bug report "
"for more details: https://launchpad.net/bugs/1841363",
{'cachemode': conf.driver_cache})
def _do_quality_warnings(self):
"""Warn about potential configuration issues.
This will log a warning message for things such as untested driver or
host arch configurations in order to indicate potential issues to
administrators.
"""
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})
if CONF.vnc.keymap:
LOG.warning('The option "[vnc] keymap" has been deprecated '
'in favor of configuration within the guest. '
'Update nova.conf to address this change and '
'refer to bug #1682020 for more information.')
if CONF.spice.keymap:
LOG.warning('The option "[spice] keymap" has been deprecated '
'in favor of configuration within the guest. '
'Update nova.conf to address this change and '
'refer to bug #1682020 for more information.')
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 init_host(self, host):
self._host.initialize()
self._check_cpu_set_configuration()
self._do_quality_warnings()
self._parse_migration_flags()
self._supported_perf_events = self._get_supported_perf_events()
self._set_multiattach_support()
self._check_file_backed_memory_support()
self._check_my_ip()
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.') %
libvirt_utils.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.') %
libvirt_utils.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.') %
libvirt_utils.version_to_string(MIN_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': libvirt_utils.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': libvirt_utils.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))):
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': libvirt_utils.version_to_string(
MIN_LIBVIRT_OTHER_ARCH.get(kvm_arch))})
# Allowing both "tunnelling via libvirtd" (which will be
# deprecated once the MIN_{LIBVIRT,QEMU}_VERSION is sufficiently
# new enough) and "native TLS" options at the same time is
# nonsensical.
if (CONF.libvirt.live_migration_tunnelled and
CONF.libvirt.live_migration_with_native_tls):
msg = _("Setting both 'live_migration_tunnelled' and "
"'live_migration_with_native_tls' at the same "
"time is invalid. If you have the relevant "
"libvirt and QEMU versions, and TLS configured "
"in your environment, pick "
"'live_migration_with_native_tls'.")
raise exception.Invalid(msg)
# Some imagebackends are only able to import raw disk images,
# and will fail if given any other format. See the bug
# https://bugs.launchpad.net/nova/+bug/1816686 for more details.
if CONF.libvirt.images_type in ('rbd',):
if not CONF.force_raw_images:
msg = _("'[DEFAULT]/force_raw_images = False' is not "
"allowed with '[libvirt]/images_type = rbd'. "
"Please check the two configs and if you really "
"do want to use rbd as images_type, set "
"force_raw_images to True.")
raise exception.InvalidConfiguration(msg)
# 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()
self._check_cpu_compatibility()
def _check_cpu_compatibility(self):
mode = CONF.libvirt.cpu_mode
models = CONF.libvirt.cpu_models
if (CONF.libvirt.virt_type not in ("kvm", "qemu") and
mode not in (None, 'none')):
msg = _("Config requested an explicit CPU model, but "
"the current libvirt hypervisor '%s' does not "
"support selecting CPU models") % CONF.libvirt.virt_type
raise exception.Invalid(msg)
if mode != "custom":
if not models:
return
msg = _("The cpu_models option is not required when "
"cpu_mode!=custom")
raise exception.Invalid(msg)
if not models:
msg = _("The cpu_models option is required when cpu_mode=custom")
raise exception.Invalid(msg)
cpu = vconfig.LibvirtConfigGuestCPU()
for model in models:
cpu.model = self._get_cpu_model_mapping(model)
if not cpu.model:
msg = (_("Configured CPU model: %(model)s is not correct, "
"or your host CPU arch does not suuport this "
"model. Please correct your config and try "
"again.") % {'model': model})
raise exception.InvalidCPUInfo(msg)
try:
self._compare_cpu(cpu, self._get_cpu_info(), None)
except exception.InvalidCPUInfo as e:
msg = (_("Configured CPU model: %(model)s is not "
"compatible with host CPU. Please correct your "
"config and try again. %(e)s") % {
'model': model, 'e': e})
raise exception.InvalidCPUInfo(msg)
# Use guest CPU model to check the compatibility between guest CPU and
# configured extra_flags
cpu = vconfig.LibvirtConfigGuestCPU()
cpu.model = self._host.get_capabilities().host.cpu.model
for flag in set(x.lower() for x in CONF.libvirt.cpu_model_extra_flags):
cpu.add_feature(vconfig.LibvirtConfigCPUFeature(flag))
try:
self._compare_cpu(cpu, self._get_cpu_info(), None)
except (exception.InvalidCPUInfo,
exception.MigrationPreCheckError) as e:
msg = (_("Configured extra flag: %(flag)s it not correct, or "
"the host CPU does not support this flag. Please "
"correct the config and try again. %(e)s") % {
'flag': flag, 'e': e})
raise exception.InvalidCPUInfo(msg)
@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.
"""
# FIXME(sbauza): We blindly recreate mediated devices without checking
# which ResourceProvider was allocated for the instance so it would use
# another pGPU.
# TODO(sbauza): Pass all instances' allocations here.
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 _check_file_backed_memory_support(self):
if CONF.libvirt.file_backed_memory:
# file_backed_memory is only compatible with qemu/kvm virts
if CONF.libvirt.virt_type not in ("qemu", "kvm"):
raise exception.InternalError(
_('Running Nova with file_backed_memory and virt_type '
'%(type)s is not supported. file_backed_memory is only '
'supported with qemu and kvm types.') %
{'type': CONF.libvirt.virt_type})
# Check needed versions for file_backed_memory
if not self._host.has_min_version(
MIN_LIBVIRT_FILE_BACKED_VERSION,
MIN_QEMU_FILE_BACKED_VERSION):
raise exception.InternalError(
_('Running Nova with file_backed_memory requires libvirt '
'version %(libvirt)s and qemu version %(qemu)s') %
{'libvirt': libvirt_utils.version_to_string(
MIN_LIBVIRT_FILE_BACKED_VERSION),
'qemu': libvirt_utils.version_to_string(
MIN_QEMU_FILE_BACKED_VERSION)})
# file-backed memory doesn't work with memory overcommit.
# Block service startup if file-backed memory is enabled and
# ram_allocation_ratio is not 1.0
if CONF.ram_allocation_ratio != 1.0:
raise exception.InternalError(
'Running Nova with file_backed_memory requires '
'ram_allocation_ratio configured to 1.0')
def _check_my_ip(self):
ips = compute_utils.get_machine_ips()
if CONF.my_ip not in ips:
LOG.warning('my_ip address (%(my_ip)s) was not found on '
'any of the interfaces: %(ifaces)s',
{'my_ip': CONF.my_ip, 'ifaces': ", ".join(ips)})
def _check_cpu_set_configuration(self):
# evaluate these now to force a quick fail if they're invalid
vcpu_pin_set = hardware.get_vcpu_pin_set() or set()
cpu_shared_set = hardware.get_cpu_shared_set() or set()
cpu_dedicated_set = hardware.get_cpu_dedicated_set() or set()
# TODO(stephenfin): Remove this in U once we remove the 'vcpu_pin_set'
# option
if not vcpu_pin_set:
if not (cpu_shared_set or cpu_dedicated_set):
return
if not cpu_dedicated_set.isdisjoint(cpu_shared_set):
msg = _(
"The '[compute] cpu_dedicated_set' and '[compute] "
"cpu_shared_set' configuration options must be "
"disjoint.")
raise exception.InvalidConfiguration(msg)
if CONF.reserved_host_cpus:
msg = _(
"The 'reserved_host_cpus' config option cannot be defined "
"alongside the '[compute] cpu_shared_set' or '[compute] "
"cpu_dedicated_set' options. Unset 'reserved_host_cpus'.")
raise exception.InvalidConfiguration(msg)
return
if cpu_dedicated_set:
# NOTE(stephenfin): This is a new option in Train so it can be
# an error
msg = _(
"The 'vcpu_pin_set' config option has been deprecated and "
"cannot be defined alongside '[compute] cpu_dedicated_set'. "
"Unset 'vcpu_pin_set'.")
raise exception.InvalidConfiguration(msg)
if cpu_shared_set:
LOG.warning(
"The '[compute] cpu_shared_set' and 'vcpu_pin_set' config "
"options have both been defined. While 'vcpu_pin_set' is "
"defined, it will continue to be used to configure the "
"specific host CPUs used for 'VCPU' inventory, while "
"'[compute] cpu_shared_set' will only be used for guest "
"emulator threads when 'hw:emulator_threads_policy=shared' "
"is defined in the flavor. This is legacy behavior and will "
"not be supported in a future release. "
"If you wish to define specific host CPUs to be used for "
"'VCPU' or 'PCPU' inventory, you must migrate the "
"'vcpu_pin_set' config option value to '[compute] "
"cpu_shared_set' and '[compute] cpu_dedicated_set', "
"respectively, and undefine 'vcpu_pin_set'.")
else:
LOG.warning(
"The 'vcpu_pin_set' config option has been deprecated and "
"will be removed in a future release. When defined, "
"'vcpu_pin_set' will be used to calculate 'VCPU' inventory "
"and schedule instances that have 'VCPU' allocations. "
"If you wish to define specific host CPUs to be used for "
"'VCPU' or 'PCPU' inventory, you must migrate the "
"'vcpu_pin_set' config option value to '[compute] "
"cpu_shared_set' and '[compute] cpu_dedicated_set', "
"respectively, and undefine 'vcpu_pin_set'.")
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)
# TODO(kchamart) Once the MIN_LIBVIRT_VERSION and MIN_QEMU_VERSION
# reach 4.4.0 and 2.11.0, which provide "native TLS" support by
# default, deprecate and remove the support for "tunnelled live
# migration" (and related config attribute), because:
#
# (a) it cannot handle live migration of disks in a non-shared
# storage setup (a.k.a. "block migration");
#
# (b) has a huge performance overhead and latency, because it burns
# more CPU and memory bandwidth due to increased number of data
# copies on both source and destination hosts.
#
# Both the above limitations are addressed by the QEMU-native TLS