Record the last shutdown reason for each VM in the store.

Signed-off-by: Ewan Mellor <ewan@xensource.com>

tools/python/xen/xend/XendConstants.py

@@ -80,6 +80,7 @@ ZOMBIE_PREFIX = 'Zombie-'
 MINIMUM_RESTART_TIME = 20
 
 RESTART_IN_PROGRESS = 'xend/restart_in_progress'
+LAST_SHUTDOWN_REASON = 'xend/last_shutdown_reason'
 
 #
 # Device migration stages (eg. XendDomainInfo, XendCheckpoint, server.tpmif)

tools/python/xen/xend/XendDomainInfo.py

@@ -969,6 +969,7 @@ class XendDomainInfo:
 
                 log.warn('Domain has crashed: name=%s id=%d.',
                          self.info['name_label'], self.domid)
+                self._writeVm(LAST_SHUTDOWN_REASON, 'crash')
 
                 if xroot.get_enable_dump():
                     self.dumpCore()
@@ -988,6 +989,7 @@ class XendDomainInfo:
 
                     log.info('Domain has shutdown: name=%s id=%d reason=%s.',
                              self.info['name_label'], self.domid, reason)
+                    self._writeVm(LAST_SHUTDOWN_REASON, reason)
 
                     self._clearRestart()