Re: [Qemu-devel] [PATCH 4/4] Add support for -net bridge

[Avi Kivity <avi@redhat.com>]

On 11/04/2009 02:28 AM, Anthony Liguori wrote:
> The most common use of -net tap is to connect a tap device to a bridge.  This
> requires the use of a script and running qemu as root in order to allocate a
> tap device to pass to the script.
>
> This model is great for portability and flexibility but it's incredibly
> difficult to eliminate the need to run qemu as root.  The only really viable
> mechanism is to use tunctl to create a tap device, attach it to a bridge as
> root, and then hand that tap device to qemu.  The problem with this mechanism
> is that it requires administrator intervention whenever a user wants to create
> a guest.
>
> By essentially writing a helper that implements the most common qemu-ifup
> script that can be safely given cap_net_admin, we can dramatically simplify
> things for non-privileged users.  We still support -net tap as a mechanism
> for advanced users and backwards compatibility.
>
> Currently, this is very Linux centric but there's really no reason why it
> couldn't be extended for other Unixes.
>
> A typical invocation of -net bridge would be:
>
>    qemu -net bridge -net nic,model=virtio
>
> The default bridge that we attach to is qemubr0.  The thinking is that a distro
> could preconfigure such an interface to allow out-of-the-box bridged networking.
>
> Alternatively, if a user wants to use a different bridge, they can say:
>
>    qemu -net bridge,br=br0 -net nic,model=virtio
>
>
> +int net_init_bridge(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan);
> +
>    

Don't we need to tear the interface down after shutdown?

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