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

Keir Fraser 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).

Another approach would be to have a common, well-known shared memory location for storing namespace info for each domain. That's a bit hairy though.

I agree that we don't want to modify Xen in order to implement higher-level communications mechanisms.


 -- Keir

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