def add_host_CPU_live(self, cpu_ref):
""" Add cpu to pool, if it is currently not assigned to a pool.
@param cpu_ref: reference of host_cpu instance to add
@type cpu_ref: str
"""
if not self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'deactivated')
node = XendNode.instance()
number = node.get_host_cpu_field(cpu_ref, 'number')
self.pool_lock.acquire()
try:
pool_id = self.query_pool_id()
other_pool_ref = self.get_cpu_pool_by_cpu_ref(cpu_ref)
if len(other_pool_ref) != 0:
raise PoolError(
XEND_ERROR_INVALID_CPU,
'cpu already assigned to pool "%s"' % other_pool_ref[0])
xc.cpupool_addcpu(pool_id, number)
finally:
self.pool_lock.release()
if number not in self.proposed_cpus:
self.proposed_cpus.append(number)
self._update_ncpu(pool_id)
if self._managed:
XendNode.instance().save_cpu_pools()
def deactivate(self):
""" Delete pool in hypervisor
Preconditions:
- pool is activated
- no running VMs in pool
Actions:
- call hypervisor for deletion
- remove path of pool in xenstore
"""
self.pool_lock.acquire()
try:
if not self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'deactivated')
if len(self.get_started_VMs()) != 0:
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'in use')
pool_id = self.query_pool_id()
# remove cpus from pool
cpus = []
for pool_rec in xc.cpupool_getinfo():
if pool_rec['cpupool'] == pool_id:
cpus = pool_rec['cpulist']
for cpu_number in cpus:
xc.cpupool_removecpu(pool_id, cpu_number)
xc.cpupool_destroy(pool_id)
# update XenStore
xs_path = XS_POOLROOT + "%s/" % pool_id
xstransact.Remove(xs_path)
finally:
self.pool_lock.release()
def set_ncpu(self, ncpu):
_ncpu = int(ncpu)
if _ncpu < 1:
raise PoolError(XEND_ERROR_POOL_PARAM, 'ncpu')
self.ncpu = _ncpu
if self._managed:
XendNode.instance().save_cpu_pools()
def get_host_CPUs(self):
""" Query all cpu refs of this pool currently asisgned .
- Read pool id of this pool from xenstore
- Read cpu configuration from hypervisor
- lookup cpu number -> cpu ref
@return: host_cpu refs
@rtype: list of str
"""
if self.get_activated():
node = XendNode.instance()
pool_id = self.query_pool_id()
if pool_id == None:
raise PoolError(XEND_ERROR_INTERNAL,
[self.getClass(), 'get_host_CPUs'])
cpus = []
for pool_rec in xc.cpupool_getinfo():
if pool_rec['cpupool'] == pool_id:
cpus = pool_rec['cpulist']
# query host_cpu ref for any cpu of the pool
host_CPUs = [
cpu_ref for cpu_ref in node.get_host_cpu_refs()
if node.get_host_cpu_field(cpu_ref, 'number') in cpus
]
else:
# pool not active, so it couldn't have any assigned cpus
host_CPUs = []
return host_CPUs
def remove_from_proposed_CPUs(self, cpu):
if self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'activated')
_cpu = int(cpu)
if _cpu in self.proposed_cpus:
self.proposed_cpus.remove(_cpu)
if self._managed:
XendNode.instance().save_cpu_pools()
def _checkName(self, name):
""" Check if a pool name is valid. Valid names contain alphabetic
characters, digits, or characters in '_-.:/+'.
The same name cannot be used for more than one pool at the same
time.
@param name: name
@type name: str
@raise: PoolError if invalid
"""
if name is None or name == '':
raise PoolError(XEND_ERROR_POOL_PARAM, 'Missing Pool Name')
if not re.search(r'^[A-Za-z0-9_\-\.\:\/\+]+$', name):
raise PoolError(XEND_ERROR_POOL_PARAM, 'Invalid Pool Name')
pool = self.lookup_pool(name)
if pool and pool.get_uuid() != self.get_uuid():
raise PoolError(XEND_ERROR_POOL_PARAM,
'Pool name "%s" already exists' % name)
def activate(self):
""" Create pool in hypervisor and add cpus.
Preconditions:
- pool not already active
- enough unbound cpus available
Actions:
- create pool in hypervisor
- select free cpus (preferred from proposed_CPUs list) and bind it to
the pool
- create entries in Xenstore
"""
self.pool_lock.acquire()
try:
if self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'activated')
sched_policy = self.get_sched_policy()
if sched_policy not in XEN_SCHEDULER_TO_ID.keys():
raise PoolError(XEND_ERROR_UNKOWN_SCHED_POLICY)
unbound_cpus = set(self.unbound_cpus())
if len(unbound_cpus) < self.ncpu:
raise PoolError(
XEND_ERROR_INSUFFICIENT_CPUS,
[str(self.ncpu), str(len(unbound_cpus))])
# build list of cpu numbers to bind to pool
cpu_set = set(self.proposed_cpus).intersection(unbound_cpus)
if len(cpu_set) < self.ncpu:
pool_cpus = (list(cpu_set) +
list(unbound_cpus.difference(cpu_set)))
else:
pool_cpus = list(cpu_set)
pool_cpus = pool_cpus[0:self.ncpu]
# create pool in hypervisor
pool_id = xc.cpupool_create(
sched=XEN_SCHEDULER_TO_ID.get(sched_policy, 0))
self.update_XS(pool_id)
# add cpus
for cpu in pool_cpus:
xc.cpupool_addcpu(pool_id, cpu)
finally:
self.pool_lock.release()
def add_to_proposed_CPUs(self, cpu):
if self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'activated')
_cpu = int(cpu)
if _cpu not in self.proposed_cpus:
self.proposed_cpus.append(_cpu)
self.proposed_cpus.sort()
if self._managed:
XendNode.instance().save_cpu_pools()
def destroy(self):
""" In order to destroy a cpu pool, it must be deactivated """
self.pool_lock.acquire()
try:
if self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'activated')
XendBase.destroy(self)
finally:
self.pool_lock.release()
XendNode.instance().save_cpu_pools()
def pool_cpu_remove(cls, poolname, cpu):
pool = cls.lookup_pool(poolname)
if not pool:
raise VmError('unknown pool %s' % poolname)
try:
cpu_ref = cls._cpu_number_to_ref(int(cpu))
if cpu_ref:
pool.remove_host_CPU_live(cpu_ref)
else:
raise PoolError(XEND_ERROR_INVALID_CPU, 'CPU unknown')
except XendAPIError, ex:
raise VmError(ex.get_api_error())
def remove_host_CPU_live(self, cpu_ref):
""" Remove cpu from pool.
After successfull call, the cpu is free.
Remove of the last cpu of the pool is rejected.
@param cpu_ref: reference of host_cpu instance to remove
@type cpu_ref: str
"""
if not self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'deactivated')
node = XendNode.instance()
number = node.get_host_cpu_field(cpu_ref, 'number')
self.pool_lock.acquire()
try:
pool_id = self.query_pool_id()
pool_rec = {}
for pool in xc.cpupool_getinfo():
if pool['cpupool'] == pool_id:
pool_rec = pool
break
if number in pool_rec['cpulist']:
if len(pool_rec['cpulist']) < 2 and pool_rec['n_dom'] > 0:
raise PoolError(XEND_ERROR_LAST_CPU_NOT_REM,
'could not remove last cpu')
xc.cpupool_removecpu(pool_id, number)
else:
raise PoolError(XEND_ERROR_INVALID_CPU,
'CPU not assigned to pool')
finally:
self.pool_lock.release()
if number in self.proposed_cpus:
self.proposed_cpus.remove(number)
self._update_ncpu(pool_id)
if self._managed:
XendNode.instance().save_cpu_pools()
def set_proposed_CPUs(self, proposed_cpus):
if self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'activated')
self.proposed_cpus = [int(cpu) for cpu in proposed_cpus]
if self._managed:
XendNode.instance().save_cpu_pools()
def set_sched_policy(self, sched_policy):
if self.get_activated():
raise PoolError(XEND_ERROR_BAD_POOL_STATE, 'activated')
self.sched_policy = sched_policy
if self._managed:
XendNode.instance().save_cpu_pools()
