[Xen-devel] Re: Multiple netif device channels

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

> Ok, an update on the matter. The reason no interface appeared in the domU
> netif backend was because xend wasn't actually configuring the domain as a
> backend. The reason being that xend was setting the backend configuration
> flags /after/ constructing the domain image [1], so nothing was happening.

Ah.  Do you have a patch for this we could apply?

> With that changed, a vif appears in the netif backend when the other domU
> is started up. However, no actual network connection can be made between
> the domains; ping just responds back with a destination host unreachable
> error.

Have you tried the hack Andy suggested (giving the backend domain access to a 
PCI device it has no drivers for) so that the backend domain will be 
privileged?  If you don't elevate its privilege level some how it will 
definitely not be able to function as a backend.

> Seperately, although still connected to networking, the netfront driver has
> code in it that prevents it from loading in a backend domain as well as the
> initial domain. That should probably be reduced down to just checking for
> the initial domain.

Yes, this can probably be safely removed now.  Does removing the backend check 
work for you?

> And lastly, on a completely seperate xen matter, i seem to recall some
> people mentioning recently about not being able to add/remove vbd's in
> running domains. I had a look at the code, and i'd guess that (like me
> lately) these people are running 2.6 in the domU's. The code to update vbd
> devices is currently commented out in the 2.6 sparse tree, as it hasn't
> been ported to the 2.6 blkfront driver yet (the code in place is a pure
> copy from the 2.4 driver).

Right, it's probably a reasonably simple update if somebody takes the time to 
trawl through and figure out what needs updating.

Thanks for working with us on this.

Cheers,
Mark


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