Re: [Qemu-devel] [PATCH 0/9] introduce virtio net dataplane

[Paolo Bonzini]

Il 27/02/2013 13:08, Markus Armbruster ha scritto:
>>> >> The main blocker to this series seems to be hubs, because they interact
>>> >> with multiple NetClients and thus could span multiple AioContexts.
>>> >> Adding proper locking there is going to be interesting. :)
>> >
>> > I think folks are pretty fed up with QEMU "vlans" (hubs).  Someone
>> > braver and with more time on their hands than me might be able to kill
>> > hubs without breaking their few use cases (-net dump, using the hub with
>> > -net socket).
> Figuring out the 'interesting' locking leaves us with 'interesting'
> locking code, and still stuck with "vlans".
> 
> Killing "vlans" would avoid the locking problems, and get rid of a
> fertile source of 'interesting' problems.
> 
> Guess how I'd prefer to see the locking problem solved :)

True, though I'd love to be proved wrong.  After all, adding proper
locking to block migration was all but difficult (once I tried).

Paolo