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 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 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 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 recreate_active_pools(cls):
""" Read active pool config from hypervisor and create pool instances.
- Query pool ids and assigned CPUs from hypervisor.
- Query additional information for any pool from xenstore.
If an entry for a pool id is missing in xenstore, it will be
recreated with a new uuid and generic name (this is an error case)
- Create an XendCPUPool instance for any pool id
Function have to be called after recreation of managed pools.
"""
log.debug('recreate_active_pools')
for pool_rec in xc.cpupool_getinfo():
pool = pool_rec['cpupool']
# read pool data from xenstore
path = XS_POOLROOT + "%s/" % pool
uuid = xstransact.Read(path, 'uuid')
if not uuid:
# xenstore entry missing / invaild; create entry with new uuid
uuid = genuuid.createString()
name = "Pool-%s" % pool
try:
inst = XendCPUPool({'name_label': name}, uuid, False)
inst.update_XS(pool)
except PoolError, ex:
# log error and skip domain
log.error('cannot recreate pool %s; skipping (reason: %s)' \
% (name, ex))
else:
(name, descr) = xstransact.Read(path, 'name', 'description')
other_config = {}
for key in xstransact.List(path + 'other_config'):
other_config[key] = xstransact.Read(path +
'other_config/%s' %
key)
# check existance of pool instance
inst = XendAPIStore.get(uuid, cls.getClass())
if inst:
# update attributes of existing instance
inst.name_label = name
inst.name_description = descr
inst.other_config = other_config
else:
# recreate instance
try:
inst = XendCPUPool(
{
'name_label': name,
'name_description': descr,
'other_config': other_config,
'proposed_CPUs': pool_rec['cpulist'],
'ncpu': len(pool_rec['cpulist']),
}, uuid, False)
except PoolError, ex:
# log error and skip domain
log.error(
'cannot recreate pool %s; skipping (reason: %s)' \
% (name, ex))
def recreate_active_pools(cls):
""" Read active pool config from hypervisor and create pool instances.
- Query pool ids and assigned CPUs from hypervisor.
- Query additional information for any pool from xenstore.
If an entry for a pool id is missing in xenstore, it will be
recreated with a new uuid and generic name (this is an error case)
- Create an XendCPUPool instance for any pool id
Function have to be called after recreation of managed pools.
"""
log.debug('recreate_active_pools')
for pool_rec in xc.cpupool_getinfo():
pool = pool_rec['cpupool']
# read pool data from xenstore
path = XS_POOLROOT + "%s/" % pool
uuid = xstransact.Read(path, 'uuid')
if not uuid:
# xenstore entry missing / invaild; create entry with new uuid
uuid = genuuid.createString()
name = "Pool-%s" % pool
try:
inst = XendCPUPool( { 'name_label' : name }, uuid, False )
inst.update_XS(pool)
except PoolError, ex:
# log error and skip domain
log.error('cannot recreate pool %s; skipping (reason: %s)' \
% (name, ex))
else:
(name, descr) = xstransact.Read(path, 'name', 'description')
other_config = {}
for key in xstransact.List(path + 'other_config'):
other_config[key] = xstransact.Read(
path + 'other_config/%s' % key)
# check existance of pool instance
inst = XendAPIStore.get(uuid, cls.getClass())
if inst:
# update attributes of existing instance
inst.name_label = name
inst.name_description = descr
inst.other_config = other_config
else:
# recreate instance
try:
inst = XendCPUPool(
{ 'name_label' : name,
'name_description' : descr,
'other_config' : other_config,
'proposed_CPUs' : pool_rec['cpulist'],
'ncpu' : len(pool_rec['cpulist']),
},
uuid, False )
except PoolError, ex:
# log error and skip domain
log.error(
'cannot recreate pool %s; skipping (reason: %s)' \
% (name, ex))
def get_cpu_pool_by_cpu_ref(cls, host_cpu):
""" Query cpu_pool ref the given cpu belongs to.
@param host_cpu: ref of host_cpu to lookup
@type host_cpu: str
@return: list cpu_pool refs (list contains not more than one element)
@rtype: list of str
"""
node = XendNode.instance()
cpu_nr = node.get_host_cpu_field(host_cpu, 'number')
for pool_rec in xc.cpupool_getinfo():
if cpu_nr in pool_rec['cpulist']:
# pool found; return the ref
return cls.query_pool_ref(pool_rec['cpupool'])
return []
def get_cpu_pool_by_cpu_ref(cls, host_cpu):
""" Query cpu_pool ref the given cpu belongs to.
@param host_cpu: ref of host_cpu to lookup
@type host_cpu: str
@return: list cpu_pool refs (list contains not more than one element)
@rtype: list of str
"""
node = XendNode.instance()
cpu_nr = node.get_host_cpu_field(host_cpu, 'number')
for pool_rec in xc.cpupool_getinfo():
if cpu_nr in pool_rec['cpulist']:
# pool found; return the ref
return cls.query_pool_ref(pool_rec['cpupool'])
return []
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 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 number_of_pools(cls):
return len(xc.cpupool_getinfo())
def _update_ncpu(self, pool_id):
for pool_rec in xc.cpupool_getinfo():
if pool_rec['cpupool'] == pool_id:
self.ncpu = len(pool_rec['cpulist'])
def number_of_pools(cls):
return len(xc.cpupool_getinfo())
def _update_ncpu(self, pool_id):
for pool_rec in xc.cpupool_getinfo():
if pool_rec['cpupool'] == pool_id:
self.ncpu = len(pool_rec['cpulist'])
