mirror of
https://github.com/virt-manager/virt-manager.git
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95d1275f57
Currently we just call libvirt API which will return all CPU models for specific architecture known to libvirt and we offer all of them to users in GUI. Let's switch to domain capabilities where we have more details about these CPUs such as whether each model is usable with current QEMU binary. If libvirt can detect the usability we will offer only CPU models that QEMU can actually run. Signed-off-by: Pavel Hrdina <phrdina@redhat.com> Reviewed-by: Cole Robinson <crobinso@redhat.com>
361 lines
12 KiB
Python
361 lines
12 KiB
Python
#
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# Helper functions for determining if libvirt supports certain features
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#
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# Copyright 2009, 2013, 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 libvirt
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from . import util
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# Check that command is present in the python bindings, and return the
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# the requested function
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def _get_command(funcname, objname=None, obj=None):
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if not obj:
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obj = libvirt
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if objname:
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if not hasattr(libvirt, objname):
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return None
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obj = getattr(libvirt, objname)
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if not hasattr(obj, funcname):
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return None
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return getattr(obj, funcname)
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# Make sure libvirt object 'objname' has function 'funcname'
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def _has_command(funcname, objname=None, obj=None):
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return bool(_get_command(funcname, objname, obj))
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# Make sure libvirt object has flag 'flag_name'
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def _get_flag(flag_name):
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return _get_command(flag_name)
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# Try to call the passed function, and look for signs that libvirt or driver
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# doesn't support it
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def _try_command(func, run_args, check_all_error=False):
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try:
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func(*run_args)
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except libvirt.libvirtError as e:
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if util.is_error_nosupport(e):
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return False
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if check_all_error:
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return False
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except Exception as e:
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# Other python exceptions likely mean the bindings are horked
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return False
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return True
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# Return the hypervisor version
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def _split_function_name(function):
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if not function:
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return (None, None)
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output = function.split(".")
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if len(output) == 1:
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return (None, output[0])
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else:
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return (output[0], output[1])
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def _check_function(function, flag, run_args, data):
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object_name, function_name = _split_function_name(function)
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if not function_name:
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return None
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# Make sure function is present in either libvirt module or
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# object_name class
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flag_tuple = ()
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if not _has_command(function_name, objname=object_name):
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return False
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if flag:
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found_flag = _get_flag(flag)
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if not bool(found_flag):
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return False
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flag_tuple = (found_flag,)
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if run_args is None:
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return None
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# If function requires an object, make sure the passed obj
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# is of the correct type
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if object_name:
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classobj = _get_command(object_name)
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if not isinstance(data, classobj):
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raise ValueError(
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"Passed obj %s with args must be of type %s, was %s" %
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(data, str(classobj), type(data)))
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cmd = _get_command(function_name, obj=data)
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# Function with args specified is all the proof we need
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return _try_command(cmd, run_args + flag_tuple,
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check_all_error=bool(flag_tuple))
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def _version_str_to_int(verstr):
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if verstr is None:
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return None
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if verstr == 0:
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return 0
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if verstr.count(".") != 2:
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raise RuntimeError("programming error: version string '%s' needs "
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"two '.' in it.")
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return ((int(verstr.split(".")[0]) * 1000000) +
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(int(verstr.split(".")[1]) * 1000) + (int(verstr.split(".")[2])))
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class _SupportCheck(object):
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"""
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@version: Minimum libvirt version required for this feature. Not used
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if 'args' provided.
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@function: Function name to check exists. If object not specified,
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function is checked against libvirt module. If run_args is specified,
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this function will actually be called, so beware.
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@run_args: Argument tuple to actually test 'function' with, and check
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for an 'unsupported' error from libvirt.
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@flag: A flag to check exists. This will be appended to the argument
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:list if run_args are provided, otherwise we will only check against
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that the flag is present in the python bindings.
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@hv_version: A dictionary with hypervisor names for keys, and
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hypervisor versions as values. This is for saying 'this feature
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is only supported with qemu version 1.5.0' or similar. If the
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version is 0, then perform no version check.
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@hv_libvirt_version: Similar to hv_version, but this will check
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the version of libvirt for a specific hv key. Use this to say
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'this feature is supported with qemu and libvirt version 1.0.0,
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and xen with libvirt version 1.1.0'
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"""
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def __init__(self,
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function=None, run_args=None, flag=None,
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version=None, hv_version=None, hv_libvirt_version=None):
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self.function = function
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self.run_args = run_args
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self.flag = flag
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self.version = version
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self.hv_version = hv_version or {}
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self.hv_libvirt_version = hv_libvirt_version or {}
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versions = ([self.version] + list(self.hv_libvirt_version.values()))
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for vstr in versions:
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v = _version_str_to_int(vstr)
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if vstr is not None and v != 0 and v < 7003:
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raise RuntimeError("programming error: Cannot enforce "
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"support checks for libvirt versions less than 0.7.3, "
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"since required APIs were not available. ver=%s" % vstr)
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def check_support(self, conn, data):
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ret = _check_function(self.function, self.flag, self.run_args, data)
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if ret is not None:
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return ret
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# Do this after the function check, since there's an ordering issue
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# with VirtinstConnection
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hv_type = conn.get_uri_driver()
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actual_libvirt_version = conn.daemon_version()
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actual_hv_version = conn.conn_version()
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# Check that local libvirt version is sufficient
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v = _version_str_to_int(self.version)
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if v and (v > actual_libvirt_version):
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return False
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if self.hv_version:
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if hv_type not in self.hv_version:
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if "all" not in self.hv_version:
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return False
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elif (actual_hv_version <
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_version_str_to_int(self.hv_version[hv_type])):
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return False
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if self.hv_libvirt_version:
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if hv_type not in self.hv_libvirt_version:
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if "all" not in self.hv_libvirt_version:
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return False
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elif (actual_libvirt_version <
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_version_str_to_int(self.hv_libvirt_version[hv_type])):
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return False
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return True
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_support_id = 0
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_support_objs = []
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def _make(*args, **kwargs):
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global _support_id
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_support_id += 1
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obj = _SupportCheck(*args, **kwargs)
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_support_objs.append(obj)
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return _support_id
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SUPPORT_CONN_STORAGE = _make(
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function="virConnect.listStoragePools", run_args=())
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SUPPORT_CONN_NODEDEV = _make(
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function="virConnect.listDevices", run_args=(None, 0))
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SUPPORT_CONN_NETWORK = _make(function="virConnect.listNetworks", run_args=())
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SUPPORT_CONN_INTERFACE = _make(
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function="virConnect.listInterfaces", run_args=())
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SUPPORT_CONN_STREAM = _make(function="virConnect.newStream", run_args=(0,))
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SUPPORT_CONN_LISTALLDOMAINS = _make(
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function="virConnect.listAllDomains", run_args=())
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SUPPORT_CONN_LISTALLNETWORKS = _make(
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function="virConnect.listAllNetworks", run_args=())
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SUPPORT_CONN_LISTALLSTORAGEPOOLS = _make(
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function="virConnect.listAllStoragePools", run_args=())
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SUPPORT_CONN_LISTALLINTERFACES = _make(
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function="virConnect.listAllInterfaces", run_args=())
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SUPPORT_CONN_LISTALLDEVICES = _make(
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function="virConnect.listAllDevices", run_args=())
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SUPPORT_CONN_WORKING_XEN_EVENTS = _make(hv_version={"xen": "4.0.0", "all": 0})
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# This is an arbitrary check to say whether it's a good idea to
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# default to qcow2. It might be fine for xen or qemu older than the versions
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# here, but until someone tests things I'm going to be a bit conservative.
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SUPPORT_CONN_DEFAULT_QCOW2 = _make(hv_version={"qemu": "1.2.0", "test": 0})
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SUPPORT_CONN_AUTOSOCKET = _make(hv_libvirt_version={"qemu": "1.0.6"})
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SUPPORT_CONN_PM_DISABLE = _make(hv_version={"qemu": "1.2.0", "test": 0})
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SUPPORT_CONN_QCOW2_LAZY_REFCOUNTS = _make(
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version="1.1.0", hv_version={"qemu": "1.2.0", "test": 0})
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SUPPORT_CONN_HYPERV_VAPIC = _make(
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version="1.1.0", hv_version={"qemu": "1.1.0", "test": 0})
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SUPPORT_CONN_HYPERV_CLOCK = _make(
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version="1.2.2", hv_version={"qemu": "1.5.3", "test": 0})
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SUPPORT_CONN_DOMAIN_CAPABILITIES = _make(
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function="virConnect.getDomainCapabilities",
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run_args=(None, None, None, None))
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SUPPORT_CONN_DOMAIN_RESET = _make(version="0.9.7", hv_version={"qemu": 0})
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SUPPORT_CONN_VMPORT = _make(
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version="1.2.16", hv_version={"qemu": "2.2.0", "test": 0})
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SUPPORT_CONN_MEM_STATS_PERIOD = _make(
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function="virDomain.setMemoryStatsPeriod",
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version="1.1.1", hv_version={"qemu": 0})
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# spice GL is actually enabled with libvirt 1.3.3, but 3.1.0 is the
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# first version that sorts out the qemu:///system + cgroup issues
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SUPPORT_CONN_SPICE_GL = _make(version="3.1.0",
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hv_version={"qemu": "2.6.0", "test": 0})
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SUPPORT_CONN_SPICE_RENDERNODE = _make(version="3.1.0",
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hv_version={"qemu": "2.9.0", "test": 0})
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SUPPORT_CONN_VIDEO_VIRTIO_ACCEL3D = _make(version="1.3.0",
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hv_version={"qemu": "2.5.0", "test": 0})
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SUPPORT_CONN_GRAPHICS_LISTEN_NONE = _make(version="2.0.0")
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SUPPORT_CONN_RNG_URANDOM = _make(version="1.3.4")
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SUPPORT_CONN_USB3_PORTS = _make(version="1.3.5")
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SUPPORT_CONN_MACHVIRT_PCI_DEFAULT = _make(version="3.0.0")
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SUPPORT_CONN_QEMU_XHCI = _make(version="3.3.0", hv_version={"qemu": "2.9.0"})
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SUPPORT_CONN_VNC_NONE_AUTH = _make(hv_version={"qemu": "2.9.0"})
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SUPPORT_CONN_DEVICE_BOOT_ORDER = _make(hv_version={"qemu": 0, "test": 0})
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# We choose qemu 2.11.0 as the first version to target for q35 default.
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# That's not really based on anything except reasonably modern at the
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# time of these patches.
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SUPPORT_QEMU_Q35_DEFAULT = _make(hv_version={"qemu": "2.11.0", "test": "0"})
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# This is for disk <driver name=qemu>. xen supports this, but it's
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# limited to arbitrary new enough xen, since I know libxl can handle it
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# but I don't think the old xend driver does.
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SUPPORT_CONN_DISK_DRIVER_NAME_QEMU = _make(
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hv_version={"qemu": 0, "xen": "4.2.0"},
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hv_libvirt_version={"qemu": 0, "xen": "1.1.0"})
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#################
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# Domain checks #
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#################
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SUPPORT_DOMAIN_XML_INACTIVE = _make(function="virDomain.XMLDesc", run_args=(),
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flag="VIR_DOMAIN_XML_INACTIVE")
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SUPPORT_DOMAIN_XML_SECURE = _make(function="virDomain.XMLDesc", run_args=(),
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flag="VIR_DOMAIN_XML_SECURE")
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SUPPORT_DOMAIN_MANAGED_SAVE = _make(
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function="virDomain.hasManagedSaveImage",
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run_args=(0,))
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SUPPORT_DOMAIN_JOB_INFO = _make(function="virDomain.jobInfo", run_args=())
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SUPPORT_DOMAIN_LIST_SNAPSHOTS = _make(
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function="virDomain.listAllSnapshots", run_args=())
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SUPPORT_DOMAIN_MEMORY_STATS = _make(
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function="virDomain.memoryStats", run_args=())
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SUPPORT_DOMAIN_STATE = _make(function="virDomain.state", run_args=())
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SUPPORT_DOMAIN_OPEN_GRAPHICS = _make(function="virDomain.openGraphicsFD",
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version="1.2.8", hv_version={"qemu": 0})
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###############
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# Pool checks #
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###############
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SUPPORT_POOL_ISACTIVE = _make(function="virStoragePool.isActive", run_args=())
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SUPPORT_POOL_LISTALLVOLUMES = _make(
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function="virStoragePool.listAllVolumes", run_args=())
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SUPPORT_POOL_METADATA_PREALLOC = _make(
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flag="VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA",
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version="1.0.1")
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####################
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# Interface checks #
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####################
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SUPPORT_INTERFACE_XML_INACTIVE = _make(function="virInterface.XMLDesc",
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flag="VIR_INTERFACE_XML_INACTIVE",
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run_args=())
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SUPPORT_INTERFACE_ISACTIVE = _make(
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function="virInterface.isActive", run_args=())
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##################
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# Network checks #
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##################
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SUPPORT_NET_ISACTIVE = _make(function="virNetwork.isActive", run_args=())
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def check_support(virtconn, feature, data=None):
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"""
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Attempt to determine if a specific libvirt feature is support given
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the passed connection.
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:param virtconn: Libvirt connection to check feature on
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:param feature: Feature type to check support for
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:type feature: One of the SUPPORT_* flags
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:param data: Option libvirt object to use in feature checking
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:type data: Could be virDomain, virNetwork, virStoragePool, hv name, etc
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:returns: True if feature is supported, False otherwise
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"""
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if "VirtinstConnection" in repr(data):
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data = data.get_conn_for_api_arg()
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sobj = _support_objs[feature - 1]
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return sobj.check_support(virtconn, data)
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def check_version(virtconn, version):
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"""
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Check libvirt version. Useful for the test suite so we don't need
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to keep adding new support checks.
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"""
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sobj = _SupportCheck(version=version)
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return sobj.check_support(virtconn, None)
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