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

[Anthony Liguori <aliguori@xxxxxxxxxx>]

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.
Regards,

>  -- Keir


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