Bugzilla #245253

Index: xen-3.0.4-testing/tools/python/xen/xend/XendDomain.py
===================================================================
--- xen-3.0.4-testing.orig/tools/python/xen/xend/XendDomain.py
+++ xen-3.0.4-testing/tools/python/xen/xend/XendDomain.py
@@ -32,6 +32,7 @@ import threading
 import xen.lowlevel.xc
 
 
+from xen.xend import sxp
 from xen.xend import XendRoot, XendCheckpoint, XendDomainInfo
 from xen.xend.PrettyPrint import prettyprint
 from xen.xend.XendConfig import XendConfig
@@ -860,6 +861,11 @@ class XendDomain:
         self.domains_lock.acquire()
         try:
             self._refresh()
+            for domid, dom in self.domains.items():
+                if (dom.state != DOM_STATE_HALTED and
+                    (dom.getName() == sxp.child_value(config, 'name') or
+                     dom.get_uuid() == sxp.child_value(config, 'uuid'))):
+                    raise XendError("Domain is already running")
 
             dominfo = XendDomainInfo.create(config)
             self._add_domain(dominfo)