Re: [Xen-devel] Proposal for init/kexec/hotplug format for Xen

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 27 Feb 2005, at 22:39, Anthony Liguori wrote:

> > > What I'm thinking about right now is how to assign out ports for 
> > > notification.  It's somewhat non-trivial to figure out the best way 
> > > to manage that.  Any thoughts?
> > The difficulty may be that, in the case of normal SysV IPC you have a 
> > common OS instance to manage shmem namespaces and semaphores and so 
> > on. For IDC over Xen you do not have this luxury, unless you modify 
> > Xen, or you are building over higher-level communication primitives 
> > (which perhaps defeats the purpose).
> This is what makes the OF directory structure so interesting.  The 
> per-domain OF structure could be used as an IDC namespace.  This 
> requires no additional modification to Xen (other than what the OF 
> structure would).
If you're talking about the persistent store, then each guest will 
probably 'connect' via some custom protocol and present an event 
channel at that time. Or we'll preallocate one when we build the 
domain. Then all notifications will be on that channel.
 -- Keir



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