Re: [Xen-devel] simple backend, frontend

[Adam H. <do...@de...>]

On Fri, 12 Nov 2004, Keir Fraser wrote:

> >  Now if I need to add another custom backend using the same method as
> > the netif or blkif backends dont I have to modify Xend as well?
> >
> > Is there a simpler way of establishing event channels between domains
> > by directly accessing the API in xen/common/event_channel.c
> >
> >  Some assumptions that Im making - the frontend will be started only
> > after the backend is running. Im primarily going to be using this
> > frontend/backend for transferring large data between a user domain and
> > the control domain.  So I will have to establish shared mem pages as
> > well.
>
> To set up an event channel and shared memory between two domains you
> need some out-of-band communication, which may or may not be xend.
> Instead the communication could be done via an interdomain IP network,
> for example. However you arrange it, each domain probably needs to
> know the domid of the other guy. Also both ends need to know the
> address of the page they are to share, and the remote port for teh
> shared event channel.

How do xenU domains talk to dom0?  Is it a single point-to-point kind of
channel?  Maybe extend that to be multipoint, like ethernet.  Then, that can
be extended to be intra-machine, for cluster support.