diff -r 9049b0b62e08 tools/python/xen/xend/XendDomain.py
--- a/tools/python/xen/xend/XendDomain.py	Fri Feb 29 10:30:28 2008 +0000
+++ b/tools/python/xen/xend/XendDomain.py	Mon Mar 03 16:19:04 2008 +0900
@@ -1364,13 +1364,23 @@ class XendDomain:
        
         # set the same cpumask for all vcpus
         rc = 0
-        for v in vcpus:
-            try:
-                rc = xc.vcpu_setaffinity(dominfo.getDomid(), int(v), cpumap)
-            except Exception, ex:
-                log.exception(ex)
-                raise XendError("Cannot pin vcpu: %s to cpu: %s - %s" % \
-                                (v, cpumap, str(ex)))
+        if dominfo._stateGet() in (DOM_STATE_RUNNING, DOM_STATE_PAUSED):
+            for v in vcpus:
+                try:
+                    rc = xc.vcpu_setaffinity(dominfo.getDomid(), int(v), cpumap)
+                except Exception, ex:
+                    log.exception(ex)
+                    raise XendError("Cannot pin vcpu: %s to cpu: %s - %s" % \
+                                    (v, cpumap, str(ex)))
+        else:
+            # FIXME: if we could define cpu affinity definitions to
+            #        each vcpu, reprogram the following processing.
+            if str(vcpu).lower() != "all":
+                raise XendError("Must specify 'all' to VCPU "
+                                "for inactive managed domains")
+            dominfo.setCpus(cpumap)
+            self.managed_config_save(dominfo)
+
         return rc
 
     def domain_cpu_sedf_set(self, domid, period, slice_, latency, extratime,
diff -r 9049b0b62e08 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py	Fri Feb 29 10:30:28 2008 +0000
+++ b/tools/python/xen/xend/XendDomainInfo.py	Mon Mar 03 16:07:18 2008 +0900
@@ -1394,6 +1394,12 @@ class XendDomainInfo:
     def setResume(self, isresume):
         self._resume = isresume
 
+    def getCpus(self):
+        return self.info['cpus']
+
+    def setCpus(self, cpumap):
+        self.info['cpus'] = cpumap
+
     def getCap(self):
         return self.info['vcpus_params']['cap']