Re: [Xen-devel] allocating virtual nic to domain0

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

> I would like to have one device per domain: domain0 has scsi
> controller1, domin2 has network adapter 1, etc.  In order to do this,
> domain0 still needs network access.

Proper driver domains stuff.  It'd certainly be a neat feature to have 
working.  The current code is almost but not quite there :-(

1) AFAIK netfront currently looks for interfaces once, at init time (and it 
doesn't do this at all if it's dom0).  Some code for dynamically reprobing 
for interfaces seems to be available but not enabled.  Netfront would need to 
be changed to support dynamically adding interfaces and to still listen for 
interfaces being added, even if in dom0.
2) The control tools don't allow you to add a frontend interface to domain 0 
(in fact, I don't know if they allow you to dynamically add net interfaces at 
all).  Xend / xm would need tweaking so you could say "and now create another 
interface for this domain".  This would send the appropriate messages to 
netback and the modified netfront to allow the interface to be connected.  
This could benefit domU domains too.

HTH,
Mark


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