[PATCH] Prevent xend from destroying Dom0

[Dan Smith <danms@us.ibm.com>]

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This patch adds a check in xend that prevents a user from trying to
destroy Dom0.  Currently, xm does not return an error for this case.
Xend tries to destroy dom0 and leaves the system in an unstable
state.  Subsequent attempts to create a domain result in the following
error message:

  Error: Error creating domain: (106, 'Transport endpoint is already \
  connected')

This will fix bugzilla bug #243

Signed-off-by: Dan Smith <danms@us.ibm.com>

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diff -r 9776d03bf108 tools/python/xen/xend/XendDomain.py
--- a/tools/python/xen/xend/XendDomain.py	Tue Sep 20 13:07:10 2005
+++ b/tools/python/xen/xend/XendDomain.py	Wed Sep 21 13:01:41 2005
@@ -45,6 +45,7 @@
 __all__ = [ "XendDomain" ]
 
 SHUTDOWN_TIMEOUT = 30
+PRIV_DOMAIN      =  0
 
 def is_dead(dom):
     return dom['crashed'] or dom['shutdown'] or (
@@ -168,7 +169,7 @@
         self.domain_restarts()
 
     def dom0_setup(self):
-        dom0 = self.domain_lookup(0)
+        dom0 = self.domain_lookup(PRIV_DOMAIN)
         if not dom0:
             dom0 = self.dom0_unknown()
         dom0.dom0_init_store()    
@@ -337,7 +338,7 @@
         return self.domains.get(id)
 
     def dom0_unknown(self):
-        dom0 = 0
+        dom0 = PRIV_DOMAIN
         uuid = None
         info = self.xen_domain(dom0)
         dompath = GetDomainPath(dom0)
@@ -505,6 +506,10 @@
 
         @param domid: domain id
         """
+
+        if domid == PRIV_DOMAIN:
+            raise XendError("Cannot destroy priviliged domain %i" % domid)
+        
         self.domain_restart_schedule(domid, reason, force=True)
         dominfo = self.domain_lookup(domid)
         if dominfo:

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-- 
Dan Smith
IBM Linux Technology Center
Open Hypervisor Team
email: danms@us.ibm.com

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