[Kimchi-devel] [PATCH v4 2/3] Update VCPU by using libvirt function
Jose Ricardo Ziviani
joserz at linux.vnet.ibm.com
Mon Sep 28 13:11:53 UTC 2015
From: Crístian Deives <cristiandeives at gmail.com>
Currently, the VCPU count is updated by editing the configuration XML
(tag: <vcpu>). However, in some cases, editing that tag will only update
the maximum VCPU count, not the current one. For example, if the VM has
the following XML tag:
<vcpu current='2'>8</vcpu>
and the user updates the VCPU value to 10, Kimchi will update the XML
tag to:
<vcpu current='2'>10</vcpu>
which is probably not what the user wanted.
Use the libvirt function "setVcpusFlags" to update the current and the
maximum VCPU values to the one specified by the user.
Signed-off-by: Aline Manera <alinefm at linux.vnet.ibm.com>
Signed-off-by: Crístian Deives <cristiandeives at gmail.com>
Signed-off-by: Jose Ricardo Ziviani <joserz at linux.vnet.ibm.com>
---
src/kimchi/i18n.py | 5 +++
src/kimchi/mockmodel.py | 48 ++++++++++-----------------
src/kimchi/model/vms.py | 88 +++++++++++++++++++++++++++++++++++++++++++++----
tests/test_rest.py | 3 +-
4 files changed, 107 insertions(+), 37 deletions(-)
diff --git a/src/kimchi/i18n.py b/src/kimchi/i18n.py
index 1004aa4..ecc10ff 100644
--- a/src/kimchi/i18n.py
+++ b/src/kimchi/i18n.py
@@ -122,6 +122,11 @@ messages = {
"KCHVM0049E": _("Cannot power off %(name)s. Virtual machine is shut off."),
"KCHVM0050E": _("Cannot shutdown %(name)s. Virtual machine is shut off."),
"KCHVM0051E": _("Cannot reset %(name)s. Virtual machine is already shut off."),
+ "KCHVM0052E": _("Unable to update the following parameters while the VM is offline: %(params)s"),
+ "KCHVM0053E": _("Unable to update the following parameters while the VM is online: %(params)s"),
+ "KCHVM0054E": _("VM '%(vm)s' cannot have more than %(cpus)d CPUs. Please update the CPU value when the VM is not running."),
+ "KCHVM0055E": _("VM '%(vm)s' cannot have less than %(cpus)d CPUs. Please update the CPU value when the VM is not running."),
+ "KCHVM0056E": _("Unable to hotplug CPUs. Details: %(err)s"),
"KCHVMHDEV0001E": _("VM %(vmid)s does not contain directly assigned host device %(dev_name)s."),
"KCHVMHDEV0002E": _("The host device %(dev_name)s is not allowed to directly assign to VM."),
diff --git a/src/kimchi/mockmodel.py b/src/kimchi/mockmodel.py
index a207a0c..128b819 100644
--- a/src/kimchi/mockmodel.py
+++ b/src/kimchi/mockmodel.py
@@ -25,6 +25,7 @@ import time
import kimchi.model.cpuinfo
+from collections import defaultdict
from lxml import objectify
from lxml.builder import E
@@ -58,10 +59,9 @@ storagevolumes.VALID_RAW_CONTENT = ['dos/mbr boot sector',
class MockModel(Model):
- _mock_vms = {}
+ _mock_vms = defaultdict(list)
_mock_snapshots = {}
_XMLDesc = libvirt.virDomain.XMLDesc
- _defineXML = libvirt.virConnect.defineXML
_undefineDomain = libvirt.virDomain.undefine
_libvirt_get_vol_path = LibvirtVMTemplate._get_volume_path
@@ -80,7 +80,6 @@ class MockModel(Model):
kimchi.model.cpuinfo.get_topo_capabilities = \
MockModel.get_topo_capabilities
- libvirt.virConnect.defineXML = MockModel.domainDefineXML
libvirt.virDomain.XMLDesc = MockModel.domainXMLDesc
libvirt.virDomain.undefine = MockModel.undefineDomain
libvirt.virDomain.attachDeviceFlags = MockModel.attachDeviceFlags
@@ -123,7 +122,7 @@ class MockModel(Model):
imageinfo.probe_image = self._probe_image
def reset(self):
- MockModel._mock_vms = {}
+ MockModel._mock_vms = defaultdict(list)
MockModel._mock_snapshots = {}
self._mock_swupdate = MockSoftwareUpdate()
self._mock_repositories = MockRepositories()
@@ -158,21 +157,15 @@ class MockModel(Model):
return ET.fromstring(xml)
@staticmethod
- def domainDefineXML(conn, xml):
- name = objectify.fromstring(xml).name.text
- try:
- dom = conn.lookupByName(name)
- if not dom.isActive():
- MockModel._mock_vms[name] = xml
- except:
- pass
+ def domainXMLDesc(dom, flags=0):
+ xml = MockModel._XMLDesc(dom, flags)
+ root = objectify.fromstring(xml)
- return MockModel._defineXML(conn, xml)
+ for dev_xml in MockModel._mock_vms.get(dom.name(), []):
+ dev = objectify.fromstring(dev_xml)
+ root.devices.append(dev)
- @staticmethod
- def domainXMLDesc(dom, flags=0):
- return MockModel._mock_vms.get(dom.name(),
- MockModel._XMLDesc(dom, flags))
+ return ET.tostring(root, encoding="utf-8")
@staticmethod
def undefineDomain(dom):
@@ -183,12 +176,7 @@ class MockModel(Model):
@staticmethod
def attachDeviceFlags(dom, xml, flags=0):
- old_xml = dom.XMLDesc(libvirt.VIR_DOMAIN_XML_SECURE)
- root = objectify.fromstring(old_xml)
- dev = objectify.fromstring(xml)
- root.devices.append(dev)
-
- MockModel._mock_vms[dom.name()] = ET.tostring(root, encoding="utf-8")
+ MockModel._mock_vms[dom.name()].append(xml)
@staticmethod
def _get_device_node(dom, xml):
@@ -214,16 +202,16 @@ class MockModel(Model):
@staticmethod
def detachDeviceFlags(dom, xml, flags=0):
- root, dev = MockModel._get_device_node(dom, xml)
- root.devices.remove(dev)
-
- MockModel._mock_vms[dom.name()] = ET.tostring(root, encoding="utf-8")
+ if xml in MockModel._mock_vms[dom.name()]:
+ MockModel._mock_vms[dom.name()].remove(xml)
@staticmethod
def updateDeviceFlags(dom, xml, flags=0):
- root, old_dev = MockModel._get_device_node(dom, xml)
- root.devices.replace(old_dev, objectify.fromstring(xml))
- MockModel._mock_vms[dom.name()] = ET.tostring(root, encoding="utf-8")
+ _, old_dev = MockModel._get_device_node(dom, xml)
+ old_xml = ET.tostring(old_dev, encoding="utf-8")
+ if old_xml in MockModel._mock_vms[dom.name()]:
+ MockModel._mock_vms[dom.name()].remove(old_xml)
+ MockModel._mock_vms[dom.name()].append(xml)
@staticmethod
def volResize(vol, size, flags=0):
diff --git a/src/kimchi/model/vms.py b/src/kimchi/model/vms.py
index b579712..96dd273 100644
--- a/src/kimchi/model/vms.py
+++ b/src/kimchi/model/vms.py
@@ -38,6 +38,7 @@ from kimchi.exception import InvalidOperation, InvalidParameter
from kimchi.exception import NotFoundError, OperationFailed
from kimchi.kvmusertests import UserTests
from kimchi.model.config import CapabilitiesModel
+from kimchi.model.cpuinfo import CPUInfoModel
from kimchi.model.featuretests import FeatureTests
from kimchi.model.tasks import TaskModel
from kimchi.model.templates import TemplateModel
@@ -63,10 +64,15 @@ DOM_STATE_MAP = {0: 'nostate',
6: 'crashed',
7: 'pmsuspended'}
-VM_STATIC_UPDATE_PARAMS = {'name': './name',
- 'cpus': './vcpu'}
+VM_STATIC_UPDATE_PARAMS = {'name': './name'}
VM_LIVE_UPDATE_PARAMS = {}
+# update parameters which are updatable when the VM is online
+VM_ONLINE_UPDATE_PARAMS = ['graphics', 'groups', 'memory', 'users']
+# update parameters which are updatable when the VM is offline
+VM_OFFLINE_UPDATE_PARAMS = ['cpus', 'graphics', 'groups', 'memory', 'name',
+ 'users']
+
XPATH_DOMAIN_DISK = "/domain/devices/disk[@device='disk']/source/@file"
XPATH_DOMAIN_DISK_BY_FILE = "./devices/disk[@device='disk']/source[@file='%s']"
XPATH_DOMAIN_NAME = '/domain/name'
@@ -76,6 +82,7 @@ XPATH_DOMAIN_MAC_BY_ADDRESS = "./devices/interface[@type='network']/"\
XPATH_DOMAIN_MEMORY = '/domain/memory'
XPATH_DOMAIN_MEMORY_UNIT = '/domain/memory/@unit'
XPATH_DOMAIN_UUID = '/domain/uuid'
+XPATH_DOMAIN_DEV_CPU_ID = '/domain/devices/spapr-cpu-socket/@id'
XPATH_NUMA_CELL = './cpu/numa/cell'
@@ -226,8 +233,20 @@ class VMModel(object):
with lock:
dom = self.get_vm(name, self.conn)
- vm_name, dom = self._static_vm_update(name, dom, params)
+
+ if DOM_STATE_MAP[dom.info()[0]] == 'shutoff':
+ ext_params = set(params.keys()) - set(VM_OFFLINE_UPDATE_PARAMS)
+ if len(ext_params) > 0:
+ raise InvalidParameter('KCHVM0052E',
+ {'params': ', '.join(ext_params)})
+ else:
+ ext_params = set(params.keys()) - set(VM_ONLINE_UPDATE_PARAMS)
+ if len(ext_params) > 0:
+ raise InvalidParameter('KCHVM0053E',
+ {'params': ', '.join(ext_params)})
+
self._live_vm_update(dom, params)
+ vm_name, dom = self._static_vm_update(name, dom, params)
return vm_name
def clone(self, name):
@@ -751,8 +770,7 @@ class VMModel(object):
vcpus = params.get('cpus')
if numa_mem == []:
if vcpus is None:
- vcpus = int(xpath_get_text(xml,
- VM_STATIC_UPDATE_PARAMS['cpus'])[0])
+ vcpus = int(xpath_get_text(xml, 'vcpu')[0])
cpu = root.find('./cpu')
if cpu is None:
cpu = get_cpu_xml(vcpus, params['memory'] << 10)
@@ -813,6 +831,62 @@ class VMModel(object):
if 'memory' in params and dom.isActive():
self._update_memory_live(dom, params)
+ if DOM_STATE_MAP[dom.info()[0]] == 'shutoff':
+ try:
+ # set maximum VCPU count
+ max_vcpus = self.conn.get().getMaxVcpus('kvm')
+ dom.setVcpusFlags(max_vcpus,
+ libvirt.VIR_DOMAIN_AFFECT_CONFIG |
+ libvirt.VIR_DOMAIN_VCPU_MAXIMUM)
+
+ # set current VCPU count
+ dom.setVcpusFlags(cpus, libvirt.VIR_DOMAIN_AFFECT_CONFIG)
+ except libvirt.libvirtError, e:
+ raise OperationFailed('KCHVM0008E', {'name': dom.name(),
+ 'err': e.message})
+ else:
+ try:
+ dev_cpu_ids = xpath_get_text(dom.XMLDesc(0),
+ XPATH_DOMAIN_DEV_CPU_ID)
+ vcpu_count = dom.vcpus(libvirt.VIR_DOMAIN_AFFECT_LIVE)
+ total_cpu_count = vcpu_count + len(dev_cpu_ids)
+ new_cpu_count = int(params['cpus'])
+ max_cpu_count = dom.maxVcpus()
+
+ if new_cpu_count > total_cpu_count: # add CPUs
+ if new_cpu_count > max_cpu_count:
+ raise InvalidOperation('KCHVM0054E',
+ {'cpus': max_cpu_count})
+
+ if len(dev_cpu_ids) == 0:
+ # there are no CPU devices yet; start from 0
+ dev_id = 0
+ else:
+ # there are some CPU devices;
+ # start from the last ID + 1
+ dev_cpu_ids.sort()
+ dev_id = int(dev_cpu_ids[-1]) + 1
+
+ for i in xrange(new_cpu_count - total_cpu_count):
+ xml = E('spapr-cpu-socket', id=str(dev_id))
+ dom.attachDevice(etree.tostring(xml))
+ dev_id += 1
+ elif new_cpu_count < total_cpu_count: # remove CPUs
+ if new_cpu_count < vcpu_count:
+ raise InvalidOperation('KCHVM0055E',
+ {'cpus': vcpu_count})
+
+ # the CPU IDs must be removed in descending order
+ dev_cpu_ids.sort(reverse=True)
+ last_id_idx = total_cpu_count - new_cpu_count
+ to_remove = dev_cpu_ids[:last_id_idx]
+
+ for dev_id in to_remove:
+ xml = E('spapr-cpu-socket', id=dev_id)
+ dom.detachDevice(etree.tostring(xml))
+ except (libvirt.libvirtError, ValueError), e:
+ raise OperationFailed('KCHVM0056E', {'err': e.message})
+
def _update_memory_live(self, dom, params):
# Check if host supports memory device
if not self.caps.mem_hotplug_support:
@@ -1011,12 +1085,14 @@ class VMModel(object):
else:
memory = info[2] >> 10
+ cpu_devs = xpath_get_text(dom.XMLDesc(0), XPATH_DOMAIN_DEV_CPU_ID)
+
return {'name': name,
'state': state,
'stats': res,
'uuid': dom.UUIDString(),
'memory': memory,
- 'cpus': info[3],
+ 'cpus': info[3] + len(cpu_devs),
'screenshot': screenshot,
'icon': icon,
# (type, listen, port, passwd, passwdValidTo)
diff --git a/tests/test_rest.py b/tests/test_rest.py
index 6c5c96d..4b3b026 100644
--- a/tests/test_rest.py
+++ b/tests/test_rest.py
@@ -154,7 +154,7 @@ class RestTests(unittest.TestCase):
req = json.dumps({'cpus': 3})
resp = self.request('/vms/vm-1', req, 'PUT')
- self.assertEquals(200, resp.status)
+ self.assertEquals(400, resp.status)
# Check if there is support to memory hotplug, once vm is running
resp = self.request('/config/capabilities').read()
@@ -168,6 +168,7 @@ class RestTests(unittest.TestCase):
req = json.dumps({"graphics": {'passwd': "abcdef"}})
resp = self.request('/vms/vm-1', req, 'PUT')
+ self.assertEquals(200, resp.status)
info = json.loads(resp.read())
self.assertEquals('abcdef', info["graphics"]["passwd"])
self.assertEquals(None, info["graphics"]["passwdValidTo"])
--
1.9.1
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