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Date: Sat, 11 Jul 2009 01:04:00 +0100
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] bidirectional data exchange between guest and host
	without network
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To: Anthony Lannuzel <anthony.lannuzel@hynesim.org>
Cc: qemu-devel@nongnu.org, Paul Brook <paul@codesourcery.com>, Lennart Sorensen <lsorense@csclub.uwaterloo.ca>

Anthony Lannuzel wrote:
> > Can you not create _another_ network device and use that?
> > QEMU lets you create lots of network devices.
>
> No, I do not want the guest to be able to communicate with the host
> network, so that is not an option.

So create a network device that is only used for the private
communication, and isolate from the rest of the host network with
firewall rules.

I'll admit that can be a lot of work, if the host has a complex
network, or a dynamic one where IP addresses are unpredictable.

For that, on the latest Linux hosts we have network cgroups :-)

> Virtualbox provides a samba-like sharing feature, which does not uses the
> network, but needs the virtualbox guest additions. Has this feature been
> discussed for qemu ?

You can just use Samba.  See the "-smb" option.

-- Jamie