> I am interested in using Xen. I need clarification on how the VMs
> and/or Domains talk to one another?? Securely?? What are the Interfaces
> and security policies for Xen?? I have read massive documentation but I
> just need some extra clarity this. Thank You.
The domains use a limited control-plane signalling mechanism (e.g. control
messages in Xen 2.0, xenstore in Xen 3.0) to set up communications. The two
mechanisms for bulk data comms are:
* shared memory: domUs pass IO requests to the backend in dom0 using shared
memory. The backend then maps their IO buffers to put the data there.
* interdomain event channels: these are like interrupt lines, allowing a
communicating pair of domains to notify each other that there is new data in
the shared memory. i.e. they indicate "hey, I queued more requests, go
look!", "hey, I completed some requests, you can retire them now"
but not
what data was actually transferred
Does that help?
Cheers,
Mark
>
>
>
> Kashif J. Brown SR
>
> Research Programmer Analyst
>
> Information Technology & Systems Division
>
>
>
> Institute for Defense Analyses
>
> 4850 Mark Center Drive
>
> Alexandria, VA 22311-1882
>
> Tel. (703) 933-6532 Fax (703) 845-6848
>
> em. kabrown@ida.org
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