[Xen-bugs] [Bug 287] New: No true noticfication mechanism for Xen tools to determine when a domain has completely been destroyed

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=287

           Summary: No true noticfication mechanism for Xen tools to
                    determine when a domain has completely been destroyed
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Tools
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jyoung5@xxxxxxxxxx


Problem:
        Today Xen tools depend on getting a VIRQ to determine if a domain has
completely gone away. The problem with this is that the VIRQ is given from the
hypervisor when a domain is asked to be destroyed. A domain is not compleltely
destroyed until all memory mapped in the domain is unmapped. The VIRQ that is
given to the tools is normally delivered before the domain is truly destroyed.
So there is a brief period of time after the domain VIRQ is delivered when the
domain has not actually gone away. There is no notification for the tools to
know that it has completley gone away, so today the tools have to assume that
once they receive a VIRQ then the domain is gone.


Possible Solution:
        A robust event system so that tools can distinguish when a domain has 
begun
dying & when the domain has died. Using another VIRQ to signal that the domain
is compeletely gone could be a solution.

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