319 lines
9.4 KiB
Python
319 lines
9.4 KiB
Python
#
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# Some code for parsing libvirt's capabilities XML
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#
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# Copyright 2007, 2012-2014 Red Hat, Inc.
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#
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# This work is licensed under the GNU GPLv2 or later.
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# See the COPYING file in the top-level directory.
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import pwd
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from .domain import DomainCpu
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from .logger import log
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from .xmlbuilder import XMLBuilder, XMLChildProperty, XMLProperty
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###################################
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# capabilities host <cpu> parsing #
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###################################
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class _CapsCPU(DomainCpu):
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arch = XMLProperty("./arch")
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###########################
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# Caps <topology> parsers #
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###########################
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class _CapsTopologyCPU(XMLBuilder):
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XML_NAME = "cpu"
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id = XMLProperty("./@id")
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class _TopologyCell(XMLBuilder):
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XML_NAME = "cell"
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cpus = XMLChildProperty(_CapsTopologyCPU, relative_xpath="./cpus")
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class _CapsTopology(XMLBuilder):
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XML_NAME = "topology"
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cells = XMLChildProperty(_TopologyCell, relative_xpath="./cells")
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######################################
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# Caps <host> and <secmodel> parsers #
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######################################
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class _CapsSecmodelBaselabel(XMLBuilder):
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XML_NAME = "baselabel"
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type = XMLProperty("./@type")
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content = XMLProperty(".")
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class _CapsSecmodel(XMLBuilder):
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XML_NAME = "secmodel"
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model = XMLProperty("./model")
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baselabels = XMLChildProperty(_CapsSecmodelBaselabel)
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class _CapsHost(XMLBuilder):
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XML_NAME = "host"
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secmodels = XMLChildProperty(_CapsSecmodel)
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cpu = XMLChildProperty(_CapsCPU, is_single=True)
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topology = XMLChildProperty(_CapsTopology, is_single=True)
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def get_qemu_baselabel(self):
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for secmodel in self.secmodels:
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if secmodel.model != "dac":
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continue
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label = None
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for baselabel in secmodel.baselabels:
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if baselabel.type in ["qemu", "kvm"]:
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label = baselabel.content
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break
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if not label:
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continue # pragma: no cover
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# XML we are looking at is like:
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#
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# <secmodel>
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# <model>dac</model>
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# <doi>0</doi>
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# <baselabel type='kvm'>+107:+107</baselabel>
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# <baselabel type='qemu'>+107:+107</baselabel>
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# </secmodel>
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try:
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uid = int(label.split(":")[0].replace("+", ""))
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user = pwd.getpwuid(uid)[0]
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return user, uid
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except Exception:
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log.debug("Exception parsing qemu dac baselabel=%s",
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label, exc_info=True)
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return None, None
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################################
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# <guest> and <domain> parsers #
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################################
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class _CapsMachine(XMLBuilder):
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XML_NAME = "machine"
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name = XMLProperty(".")
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canonical = XMLProperty("./@canonical")
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class _CapsDomain(XMLBuilder):
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XML_NAME = "domain"
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hypervisor_type = XMLProperty("./@type")
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emulator = XMLProperty("./emulator")
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machines = XMLChildProperty(_CapsMachine)
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class _CapsGuestFeatures(XMLBuilder):
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XML_NAME = "features"
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pae = XMLProperty("./pae", is_bool=True)
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acpi = XMLProperty("./acpi/@default", is_onoff=True)
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apic = XMLProperty("./apic/@default", is_onoff=True)
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class _CapsGuest(XMLBuilder):
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XML_NAME = "guest"
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os_type = XMLProperty("./os_type")
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arch = XMLProperty("./arch/@name")
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loader = XMLProperty("./arch/loader")
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emulator = XMLProperty("./arch/emulator")
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domains = XMLChildProperty(_CapsDomain, relative_xpath="./arch")
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features = XMLChildProperty(_CapsGuestFeatures, is_single=True)
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machines = XMLChildProperty(_CapsMachine, relative_xpath="./arch")
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###############
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# Public APIs #
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###############
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def all_machine_names(self, domain):
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"""
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Return all machine string names, including canonical aliases for
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the guest+domain combo but avoiding duplicates
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"""
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mobjs = (domain and domain.machines) or self.machines
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ret = []
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for m in mobjs:
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ret.append(m.name)
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if m.canonical and m.canonical not in ret:
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ret.append(m.canonical)
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return ret
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def is_kvm_available(self):
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"""
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Return True if kvm guests can be installed
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"""
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for d in self.domains:
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if d.hypervisor_type == "kvm":
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return True
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return False
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def supports_pae(self):
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"""
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Return True if capabilities report support for PAE
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"""
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return bool(self.features.pae)
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def supports_acpi(self):
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"""
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Return Tree if capabilities report support for ACPI
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"""
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return bool(self.features.acpi)
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def supports_apic(self):
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"""
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Return Tree if capabilities report support for APIC
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"""
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return bool(self.features.apic)
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############################
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# Main capabilities object #
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############################
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class _CapsInfo(object):
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"""
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Container object to hold the results of guest_lookup, so users don't
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need to juggle two objects
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"""
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def __init__(self, conn, guest, domain):
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self.conn = conn
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self.guest = guest
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self.domain = domain
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self.hypervisor_type = self.domain.hypervisor_type
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self.os_type = self.guest.os_type
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self.arch = self.guest.arch
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self.loader = self.guest.loader
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self.emulator = self.domain.emulator or self.guest.emulator
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self.machines = self.guest.all_machine_names(self.domain)
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class Capabilities(XMLBuilder):
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def __init__(self, *args, **kwargs):
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XMLBuilder.__init__(self, *args, **kwargs)
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self._cpu_models_cache = {}
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XML_NAME = "capabilities"
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host = XMLChildProperty(_CapsHost, is_single=True)
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guests = XMLChildProperty(_CapsGuest)
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############################
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# Public XML building APIs #
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############################
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def _guestForOSType(self, os_type, arch):
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archs = [arch]
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if arch is None:
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archs = [self.host.cpu.arch, None]
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for a in archs:
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for g in self.guests:
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if ((os_type is None or g.os_type == os_type) and
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(a is None or g.arch == a)):
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return g
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def _bestDomainType(self, guest, dtype, machine):
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"""
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Return the recommended domain for use if the user does not explicitly
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request one.
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"""
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domains = []
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for d in guest.domains:
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if dtype and d.hypervisor_type != dtype.lower():
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continue
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if machine and machine not in guest.all_machine_names(d):
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continue
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domains.append(d)
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if not domains:
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return None
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priority = ["kvm", "xen", "qemu"]
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for t in priority:
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for d in domains:
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if d.hypervisor_type == t:
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return d
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# Fallback, just return last item in list
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return domains[-1]
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def has_install_options(self):
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"""
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Return True if there are any install options available
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"""
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for guest in self.guests:
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if guest.domains:
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return True
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return False
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def guest_lookup(self, os_type=None, arch=None, typ=None, machine=None):
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"""
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Simple virtualization availability lookup
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Convenience function for looking up 'Guest' and 'Domain' capabilities
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objects for the desired virt type. If type, arch, or os_type are none,
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we return the default virt type associated with those values. These are
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typically:
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- os_type : hvm, then xen
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- typ : kvm over plain qemu
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- arch : host arch over all others
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Otherwise the default will be the first listed in the capabilities xml.
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This function throws C{ValueError}s if any of the requested values are
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not found.
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:param typ: Virtualization type ('hvm', 'xen', ...)
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:param arch: Guest architecture ('x86_64', 'i686' ...)
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:param os_type: Hypervisor name ('qemu', 'kvm', 'xen', ...)
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:param machine: Optional machine type to emulate
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:returns: A _CapsInfo object containing the found guest and domain
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"""
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# F22 libxl xen still puts type=linux in the XML, so we need
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# to handle it for caps lookup
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if os_type == "linux":
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os_type = "xen"
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guest = self._guestForOSType(os_type, arch)
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if not guest:
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archstr = _("for arch '%s'") % arch
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if not arch:
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archstr = ""
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osstr = _("virtualization type '%s'") % os_type
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if not os_type:
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osstr = _("any virtualization options")
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raise ValueError(_("Host does not support %(virttype)s %(arch)s") %
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{'virttype': osstr, 'arch': archstr})
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domain = self._bestDomainType(guest, typ, machine)
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if domain is None:
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machinestr = " with machine '%s'" % machine
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if not machine:
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machinestr = ""
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raise ValueError(_("Host does not support domain type %(domain)s"
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"%(machine)s for virtualization type "
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"'%(virttype)s' arch '%(arch)s'") %
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{'domain': typ, 'virttype': guest.os_type,
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'arch': guest.arch, 'machine': machinestr})
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capsinfo = _CapsInfo(self.conn, guest, domain)
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return capsinfo
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