Re: [Xen-devel] Running netback/blkback in non-dom0 domains

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

On Thursday 17 July 2008, Anton Burtsev wrote:
> Hi,
>
> Is there a way to configure/hack Xen to run backend devices in
> a non-dom0 domain (in domU). Like, for example connect two domU
> domains with a block device.

Yes, I think this should Just Work with the right configuration parameters...

Set:
blkif = 'yes'
or
netif = 'yes'

As appropriate in your domain config file for the "backend" domU.  Then in the 
frontend domU's config file you can specify something like:

disks = [ 'phy:hda1,hda1,w,BACK' ]

substituting the domid of the backend domain for BACK (its name might work, 
possibly, I'm not sure).  Specifying file: or tap: disks in the backend domU 
to work in this way might be a bit of a fiddle (if it's possible) but phy: 
should work just fine.

or you can do:

vif 
= 
"type=TYPE,mac=MAC,bridge=BRIDGE,ip=IPADDR,script=SCRIPT,backend=DOM,vifname=NAME"

again, specifying the domid (or possibly the name) of the backend domain.

If you start the backend and then the frontend from these config files they 
should be able to connect do virtual device IO.

Cheers,
Mark


-- 
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/)

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