94 lines
3.4 KiB
Python
94 lines
3.4 KiB
Python
# Copyright (c) 2013 Intel, Inc.
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# Copyright (c) 2013 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_serialization import jsonutils
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from nova import exception
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from nova.i18n import _
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from nova.pci import devspec
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class Whitelist(object):
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"""White list class to represent assignable pci devices.
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Not all devices on a compute node can be assigned to a guest. The cloud
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administrator decides which devices can be assigned based on ``vendor_id``
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or ``product_id``, etc. If no white list is specified, no devices will be
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assignable.
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"""
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def __init__(self, whitelist_spec=None):
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"""White list constructor
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For example, the following json string specifies that devices whose
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vendor_id is '8086' and product_id is '1520' can be assigned
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to guests. ::
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'[{"product_id":"1520", "vendor_id":"8086"}]'
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:param whitelist_spec: A JSON string for a dictionary or list thereof.
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Each dictionary specifies the pci device properties requirement.
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See the definition of ``passthrough_whitelist`` in
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``nova.conf.pci`` for details and examples.
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"""
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if whitelist_spec:
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self.specs = self._parse_white_list_from_config(whitelist_spec)
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else:
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self.specs = []
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@staticmethod
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def _parse_white_list_from_config(whitelists):
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"""Parse and validate the pci whitelist from the nova config."""
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specs = []
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for jsonspec in whitelists:
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try:
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dev_spec = jsonutils.loads(jsonspec)
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except ValueError:
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raise exception.PciConfigInvalidWhitelist(
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reason=_("Invalid entry: '%s'") % jsonspec)
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if isinstance(dev_spec, dict):
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dev_spec = [dev_spec]
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elif not isinstance(dev_spec, list):
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raise exception.PciConfigInvalidWhitelist(
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reason=_("Invalid entry: '%s'; "
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"Expecting list or dict") % jsonspec)
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for ds in dev_spec:
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if not isinstance(ds, dict):
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raise exception.PciConfigInvalidWhitelist(
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reason=_("Invalid entry: '%s'; "
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"Expecting dict") % ds)
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spec = devspec.PciDeviceSpec(ds)
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specs.append(spec)
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return specs
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def device_assignable(self, dev):
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"""Check if a device can be assigned to a guest.
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:param dev: A dictionary describing the device properties
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"""
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for spec in self.specs:
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if spec.match(dev):
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return True
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return False
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def get_devspec(self, pci_dev):
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for spec in self.specs:
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if spec.match_pci_obj(pci_dev):
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return spec
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