Re: [Qemu-devel] Re: [PATCH 9/9] Introduce VLANClientState::cleanup()

[Anthony Liguori]

Avi Kivity wrote:
> True, but is it actually useful?
>
> Short-circuiting two guest devices probably isn't.  Adding host 
> devices (like recording packets) might be.

But you can do this by just inserting yourself between the 
frontend/backend.  You can do this dynamically as long as you don't 
require feature negotiation.  Dynamic negotiation is prohibitively 
difficult and one of the primary reasons we haven't been able to merge 
vnet support for tap yet.

The bus architecture is only useful if you want to generate and receive 
traffic on a vlan, not if you just want to record traffic.

--
Regards,

Anthony Liguori