337 lines
9.7 KiB
Python
337 lines
9.7 KiB
Python
#
|
|
# Support for parsing libvirt's domcapabilities XML
|
|
#
|
|
# Copyright 2014 Red Hat, Inc.
|
|
#
|
|
# This work is licensed under the GNU GPLv2 or later.
|
|
# See the COPYING file in the top-level directory.
|
|
|
|
import re
|
|
import xml.etree.ElementTree as ET
|
|
|
|
import libvirt
|
|
|
|
from .domain import DomainCpu
|
|
from .logger import log
|
|
from .xmlbuilder import XMLBuilder, XMLChildProperty, XMLProperty
|
|
|
|
|
|
########################################
|
|
# Genering <enum> and <value> handling #
|
|
########################################
|
|
|
|
class _Value(XMLBuilder):
|
|
XML_NAME = "value"
|
|
value = XMLProperty(".")
|
|
|
|
|
|
class _HasValues(XMLBuilder):
|
|
values = XMLChildProperty(_Value)
|
|
|
|
def get_values(self):
|
|
return [v.value for v in self.values]
|
|
|
|
|
|
class _Enum(_HasValues):
|
|
XML_NAME = "enum"
|
|
name = XMLProperty("./@name")
|
|
|
|
|
|
class _CapsBlock(_HasValues):
|
|
supported = XMLProperty("./@supported", is_yesno=True)
|
|
enums = XMLChildProperty(_Enum)
|
|
|
|
def enum_names(self):
|
|
return [e.name for e in self.enums]
|
|
|
|
def get_enum(self, name):
|
|
d = dict((e.name, e) for e in self.enums)
|
|
return d[name]
|
|
|
|
|
|
def _make_capsblock(xml_root_name):
|
|
"""
|
|
Build a class object representing a list of <enum> in the XML. For
|
|
example, domcapabilities may have a block like:
|
|
|
|
<graphics supported='yes'>
|
|
<enum name='type'>
|
|
<value>sdl</value>
|
|
<value>vnc</value>
|
|
<value>spice</value>
|
|
</enum>
|
|
</graphics>
|
|
|
|
To build a class that tracks that whole <graphics> block, call this
|
|
like _make_capsblock("graphics")
|
|
"""
|
|
class TmpClass(_CapsBlock):
|
|
pass
|
|
setattr(TmpClass, "XML_NAME", xml_root_name)
|
|
return TmpClass
|
|
|
|
|
|
################################
|
|
# SEV launch security handling #
|
|
################################
|
|
|
|
class _SEV(XMLBuilder):
|
|
XML_NAME = "sev"
|
|
supported = XMLProperty("./@supported", is_yesno=True)
|
|
cbitpos = XMLProperty("./cbitpos", is_int=True)
|
|
reducedPhysBits = XMLProperty("./reducedPhysBits", is_int=True)
|
|
|
|
|
|
#############################
|
|
# Misc toplevel XML classes #
|
|
#############################
|
|
|
|
class _OS(_CapsBlock):
|
|
XML_NAME = "os"
|
|
loader = XMLChildProperty(_make_capsblock("loader"), is_single=True)
|
|
|
|
|
|
class _Devices(_CapsBlock):
|
|
XML_NAME = "devices"
|
|
hostdev = XMLChildProperty(_make_capsblock("hostdev"), is_single=True)
|
|
disk = XMLChildProperty(_make_capsblock("disk"), is_single=True)
|
|
|
|
|
|
class _Features(_CapsBlock):
|
|
XML_NAME = "features"
|
|
gic = XMLChildProperty(_make_capsblock("gic"), is_single=True)
|
|
sev = XMLChildProperty(_SEV, is_single=True)
|
|
|
|
|
|
###############
|
|
# CPU classes #
|
|
###############
|
|
|
|
class _CPUModel(XMLBuilder):
|
|
XML_NAME = "model"
|
|
model = XMLProperty(".")
|
|
usable = XMLProperty("./@usable")
|
|
fallback = XMLProperty("./@fallback")
|
|
|
|
|
|
class _CPUFeature(XMLBuilder):
|
|
XML_NAME = "feature"
|
|
name = XMLProperty("./@name")
|
|
policy = XMLProperty("./@policy")
|
|
|
|
|
|
class _CPUMode(XMLBuilder):
|
|
XML_NAME = "mode"
|
|
name = XMLProperty("./@name")
|
|
supported = XMLProperty("./@supported", is_yesno=True)
|
|
vendor = XMLProperty("./vendor")
|
|
|
|
models = XMLChildProperty(_CPUModel)
|
|
def get_model(self, name):
|
|
for model in self.models:
|
|
if model.model == name:
|
|
return model
|
|
|
|
features = XMLChildProperty(_CPUFeature)
|
|
|
|
|
|
class _CPU(XMLBuilder):
|
|
XML_NAME = "cpu"
|
|
modes = XMLChildProperty(_CPUMode)
|
|
|
|
def get_mode(self, name):
|
|
for mode in self.modes:
|
|
if mode.name == name:
|
|
return mode
|
|
|
|
|
|
#################################
|
|
# DomainCapabilities main class #
|
|
#################################
|
|
|
|
class DomainCapabilities(XMLBuilder):
|
|
@staticmethod
|
|
def build_from_params(conn, emulator, arch, machine, hvtype):
|
|
xml = None
|
|
if conn.support.conn_domain_capabilities():
|
|
try:
|
|
xml = conn.getDomainCapabilities(emulator, arch,
|
|
machine, hvtype)
|
|
except Exception:
|
|
log.debug("Error fetching domcapabilities XML",
|
|
exc_info=True)
|
|
|
|
if not xml:
|
|
# If not supported, just use a stub object
|
|
return DomainCapabilities(conn)
|
|
return DomainCapabilities(conn, parsexml=xml)
|
|
|
|
@staticmethod
|
|
def build_from_guest(guest):
|
|
return DomainCapabilities.build_from_params(guest.conn,
|
|
guest.emulator, guest.os.arch, guest.os.machine, guest.type)
|
|
|
|
# Mapping of UEFI binary names to their associated architectures. We
|
|
# only use this info to do things automagically for the user, it shouldn't
|
|
# validate anything the user explicitly enters.
|
|
_uefi_arch_patterns = {
|
|
"i686": [
|
|
r".*ovmf-ia32.*", # fedora, gerd's firmware repo
|
|
],
|
|
"x86_64": [
|
|
r".*OVMF_CODE\.fd", # RHEL
|
|
r".*ovmf-x64/OVMF.*\.fd", # gerd's firmware repo
|
|
r".*ovmf-x86_64-.*", # SUSE
|
|
r".*ovmf.*", ".*OVMF.*", # generic attempt at a catchall
|
|
],
|
|
"aarch64": [
|
|
r".*AAVMF_CODE\.fd", # RHEL
|
|
r".*aarch64/QEMU_EFI.*", # gerd's firmware repo
|
|
r".*aarch64.*", # generic attempt at a catchall
|
|
],
|
|
"armv7l": [
|
|
r".*arm/QEMU_EFI.*", # fedora, gerd's firmware repo
|
|
],
|
|
}
|
|
|
|
def find_uefi_path_for_arch(self):
|
|
"""
|
|
Search the loader paths for one that matches the passed arch
|
|
"""
|
|
if not self.arch_can_uefi():
|
|
return
|
|
|
|
patterns = self._uefi_arch_patterns.get(self.arch)
|
|
for pattern in patterns:
|
|
for path in [v.value for v in self.os.loader.values]:
|
|
if re.match(pattern, path):
|
|
return path
|
|
|
|
def label_for_firmware_path(self, path):
|
|
"""
|
|
Return a pretty label for passed path, based on if we know
|
|
about it or not
|
|
"""
|
|
if not path:
|
|
if self.arch in ["i686", "x86_64"]:
|
|
return _("BIOS")
|
|
return _("None")
|
|
|
|
for arch, patterns in self._uefi_arch_patterns.items():
|
|
for pattern in patterns:
|
|
if re.match(pattern, path):
|
|
return (_("UEFI %(arch)s: %(path)s") %
|
|
{"arch": arch, "path": path})
|
|
|
|
return _("Custom: %(path)s" % {"path": path})
|
|
|
|
def arch_can_uefi(self):
|
|
"""
|
|
Return True if we know how to setup UEFI for the passed arch
|
|
"""
|
|
return self.arch in list(self._uefi_arch_patterns.keys())
|
|
|
|
def supports_uefi_xml(self):
|
|
"""
|
|
Return True if libvirt advertises support for proper UEFI setup
|
|
"""
|
|
return ("readonly" in self.os.loader.enum_names() and
|
|
"yes" in self.os.loader.get_enum("readonly").get_values())
|
|
|
|
def supports_safe_host_model(self):
|
|
"""
|
|
Return True if domcaps reports support for cpu mode=host-model.
|
|
host-model infact predates this support, however it wasn't
|
|
general purpose safe prior to domcaps advertisement.
|
|
"""
|
|
for m in self.cpu.modes:
|
|
if (m.name == "host-model" and m.supported and
|
|
m.models[0].fallback == "forbid"):
|
|
return True
|
|
return False
|
|
|
|
def get_cpu_models(self):
|
|
models = []
|
|
|
|
for m in self.cpu.modes:
|
|
if m.name == "custom" and m.supported:
|
|
for model in m.models:
|
|
if model.usable != "no":
|
|
models.append(model.model)
|
|
|
|
return models
|
|
|
|
def _convert_mode_to_cpu(self, xml):
|
|
root = ET.fromstring(xml)
|
|
root.tag = "cpu"
|
|
root.attrib = None
|
|
arch = ET.SubElement(root, "arch")
|
|
arch.text = self.arch
|
|
return ET.tostring(root, encoding="unicode")
|
|
|
|
def _get_expanded_cpu(self, mode):
|
|
cpuXML = self._convert_mode_to_cpu(mode.get_xml())
|
|
log.debug("CPU XML for security flag baseline: %s", cpuXML)
|
|
|
|
try:
|
|
expandedXML = self.conn.baselineHypervisorCPU(
|
|
self.path, self.arch, self.machine, self.domain, [cpuXML],
|
|
libvirt.VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES)
|
|
except libvirt.libvirtError:
|
|
expandedXML = self.conn.baselineCPU([cpuXML],
|
|
libvirt.VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES)
|
|
|
|
log.debug("Expanded CPU XML: %s", expandedXML)
|
|
|
|
return DomainCpu(self.conn, expandedXML)
|
|
|
|
_features = None
|
|
|
|
def get_cpu_security_features(self):
|
|
sec_features = [
|
|
'spec-ctrl',
|
|
'ssbd',
|
|
'ibpb',
|
|
'virt-ssbd',
|
|
'md-clear']
|
|
|
|
if self._features:
|
|
return self._features
|
|
|
|
self._features = []
|
|
|
|
for m in self.cpu.modes:
|
|
if m.name != "host-model" or not m.supported:
|
|
continue
|
|
|
|
try:
|
|
cpu = self._get_expanded_cpu(m)
|
|
except libvirt.libvirtError as e:
|
|
log.warning(_("Failed to get expanded CPU XML: %s"), e)
|
|
break
|
|
|
|
for feature in cpu.features:
|
|
if feature.name in sec_features:
|
|
self._features.append(feature.name)
|
|
|
|
return self._features
|
|
|
|
def supports_sev_launch_security(self):
|
|
"""
|
|
Returns False if either libvirt doesn't advertise support for SEV at
|
|
all (< libvirt-4.5.0) or if it explicitly advertises it as unsupported
|
|
on the platform
|
|
"""
|
|
return bool(self.features.sev.supported)
|
|
|
|
XML_NAME = "domainCapabilities"
|
|
os = XMLChildProperty(_OS, is_single=True)
|
|
cpu = XMLChildProperty(_CPU, is_single=True)
|
|
devices = XMLChildProperty(_Devices, is_single=True)
|
|
features = XMLChildProperty(_Features, is_single=True)
|
|
|
|
arch = XMLProperty("./arch")
|
|
domain = XMLProperty("./domain")
|
|
machine = XMLProperty("./machine")
|
|
path = XMLProperty("./path")
|