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Re: [Xen-devel] Fwd: netback (Network backend) in domU

On Tue, Jun 19, 2012 at 09:49:12AM -0400, Shakeel Butt wrote:
> I previously email at xen-user list but didn't get any response. I am
> using Xen-3.4.0 and 2.6.18 as dom0 kernel and facing below problem.

Wow. That is quite ancient. Do you see the same problem with the latest
Linux kernel?

> ---------- Forwarded message ----------
> From: Shakeel Butt <shakeel.butt@xxxxxxxxx>
> Date: Mon, Jun 18, 2012 at 10:06 AM
> Subject: netback (Network backend) in domU
> To: xen-users@xxxxxxxxxxxxx
> Hi,
> I am trying to setup a domU as a network backend for some other domUs.
> I configured bridge in netback-domU using network-bridge script (not a
> driver domain). I am assigning static ip addresses to all domUs.
> Something like  dom0 <-> netback-domU <-> other-domU.
> In the setup, netback-domU and other-domU are able to ping each other
> but whenever I tried to ping dom0 from other-domU, I get a XEN error
> message "grant_table.c:387:d0 Could not pin grant frame 9d44e" and in
> dom0 kernel "#### netback grant fails".
> I didn't check if dom0 is trying to pin grant frame of other-domU but
> why dom0 would do it. Please any help will be appreciated.

Looks like a bug in the old code.
> BTW does the bridge in dom0 needs to know that one of its interface is
> connected to another bridge in netback-domU? (don't know how or why)

> thanks,
> Shakeel
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