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[Qemu-devel] Re: [PATCH 0/4] net-bridge: rootless bridge support for qem

From: Michael S. Tsirkin
Subject: [Qemu-devel] Re: [PATCH 0/4] net-bridge: rootless bridge support for qemu
Date: Wed, 4 Nov 2009 19:04:06 +0200
User-agent: Mutt/1.5.19 (2009-01-05)

On Tue, Nov 03, 2009 at 06:28:01PM -0600, Anthony Liguori wrote:
> This series solves a problem that I've been struggling with for a few years 
> now.
> One of the best things about qemu is that it's possible to run guests as an
> unprivileged user to improve security.  However, if you want to have your 
> guests
> communicate with the outside world, you're pretty much forced to run qemu as
> root.
> At least with KVM support, this is probably the most common use case which 
> means
> that most of our users are running qemu as root.  That's terrible.
> We address this problem by introducing a new network backend: -net bridge.  
> This
> backend is less flexible than -net tap because it relies on a helper with
> elevated privileges to do the heavy lifting of allocating and attaching a tap
> device to a bridge.  We use a special purpose helper because we don't want
> to elevate the privileges of more generic tools like brctl.
> >From a user perspective, to use bridged networking with a guest, you simply 
> >use:
>   qemu -hda linux.img -net bridge -net nic
> And assuming a bridge is defined named qemubr0 and the administrator has setup
> permissions accordingly, it will Just Work.  My hope is that distributions 
> will
> do this work as part of the qemu packaging process such that for most users,
> the out-of-the-box experience will also Just Work.
> More details are included in individual patches.  I broke up the helper into
> a series of patches to improve reviewabilty.

Would raw backend attached to a bridge mostly do the same?


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