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Reviewed:  https://review.openstack.org/359548
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=22b8ae0975187a847fc201a750f05be0af9818a4
Submitter: Jenkins
Branch:    master

commit 22b8ae0975187a847fc201a750f05be0af9818a4
Author: Huan Xie <huan.xie@xxxxxxxxxx>
Date:   Wed Aug 24 02:25:10 2016 +0000

    XenAPI: Fix VM live-migrate with iSCSI SR volume
    
    With XenServer 7.0 (XCP 2.1.0), VM live migration with iSCSI volume
    will fail due to no relax_xsm_sr_check in /etc/xapi.conf in Dom0.
    But since XS7.0, the default value of relax_xsm_sr_check is true if
    not configured in /etc/xapi.conf in Dom0.
    This fix is to add checks on XCP version, if it's equal or greater
    than 2.1.0, will treat relax_xsm_sr_check=true if not found in
    /etc/xapi.conf
    
    Change-Id: I88d1d384ab7587c428e517d184258bb517dfb4ab
    Closes-bug: #1610932


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1610932

Title:
  XenServer 7.0 failed live-migrate with iSCSI SR volume

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  I deployed a two compute nodes devstack environment with XenServer 7.0 (XCP platform version 2.1.0)
  I booted a VM and tried to live migrate it to another compute node, but it failed at both source compute node and dest compute node with:

  2016-08-08 02:29:46.042 DEBUG oslo_messaging.drivers.amqpdriver [-] received reply msg_id: 8022537717374357b576f5a11ec98719 from (pid=30939) __call_ /usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py:296
  2016-08-08 02:29:46.045 ERROR oslo_messaging.rpc.server [req-fc49665b-5361-4042-bcca-2992335f75a8 admin demo] Exception during message handling
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server Traceback (most recent call last):
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line 133, in _process_incoming
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 150, in dispatch
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server return self._do_dispatch(endpoint, method, ctxt, args)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 121, in _do_dispatch
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server result = func(ctxt, **new_args)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/opt/stack/nova/nova/exception_wrapper.py", line 75, in wrapped
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server function_name, call_dict, binary)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in _exit_
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server self.force_reraise()
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server six.reraise(self.type_, self.value, self.tb)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/opt/stack/nova/nova/exception_wrapper.py", line 66, in wrapped
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server return f(self, context, *args, **kw)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/opt/stack/nova/nova/compute/utils.py", line 613, in decorated_function
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server return function(self, context, *args, **kwargs)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/opt/stack/nova/nova/compute/manager.py", line 216, in decorated_function
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server kwargs['instance'], e, sys.exc_info())
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in _exit_
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server self.force_reraise()
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server six.reraise(self.type_, self.value, self.tb)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/opt/stack/nova/nova/compute/manager.py", line 204, in decorated_function
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server return function(self, context, *args, **kwargs)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/opt/stack/nova/nova/compute/manager.py", line 5118, in check_can_live_migrate_source
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server block_device_info)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/opt/stack/nova/nova/virt/xenapi/driver.py", line 484, in check_can_live_migrate_source
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server dest_check_data)
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 2246, in check_can_live_migrate_source
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server raise exception.MigrationError(reason=_('XAPI supporting '
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server MigrationError: Migration error: XAPI supporting relax-xsm-sr-check=true required
  2016-08-08 02:29:46.045 TRACE oslo_messaging.rpc.server 
  2016-08-08 02:29:46.058 DEBUG oslo_messaging._drivers.amqpdriver [req-fc49665b-5361-4042-bcca-2992335f75a8 admin demo] sending reply msg_id: 65f490411aa040658334509746dc94d4 reply queue: reply_2672337a8bd94bc189201dd0bc97098d time elapsed: 0.21841500001s from (pid=30939) _send_reply /usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py:73

  =================================

  Analyze:
  With XenServer 7.0 (XCP 2.1.0), "relax-xsm-sr-check=true" is the default setting even it is not set in /etc/xapi.conf, so with XenServer 7.0 and later, if "relax-xsm-sr-check=true" is not set, nova compute driver need use the default value, related code: https://github.com/openstack/nova/blob/master/nova/virt/xenapi/vmops.py#L2218

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