Re: [Qemu-devel] vhost acceleration broken?

[Rusty Russell]

Anthony Liguori <address@hidden> writes:
> "Michael S. Tsirkin" <address@hidden> writes:
>
>> On Thu, Jul 25, 2013 at 04:56:05PM +0200, Andreas Färber wrote:
>>> Am 25.07.2013 16:52, schrieb Michael S. Tsirkin:
>>> > On Thu, Jul 25, 2013 at 08:28:00AM -0500, Anthony Liguori wrote:
>>> >> We have a pretty awful legacy command line set that comes from years of
>>> >> half-baked concepts and the years when too many people just committed
>>> >> random shit to the tree.
>>> >>
>>> >> I think we probably need to start planning for a clean break.  Maybe
>>> >> that's a good target for a 2.0 version...
>>> > 
>>> > Assuming -netdev supports all required configurations, we should
>>> > remove -net from the -help output.
>>> 
>>> Peter had raised the issue of -netdev not working well with boards that
>>> already supply a default NIC - was there a solution yet?
>>> 
>>> Andreas
>>
>> Whoever is removing -net will have to code that up. Want to do this?
>
> I would not rush to remove things.  If we're going to go through a
> deprecation process, we should start with a proposal on what things
> should be removed and go from there.
>
> I still don't even think -netdev is the right answer here either.
> Wouldn't it make more sense to have something like:
>
> qemu -vnic tap,script=/foo/myscript
>
> Or something vaguely understandable by a human?

OK.  It seems to me that each net device has a host side and a guest
side, which you can mix and match.  So the commandline should reflect
that explicitly:

        qemu -hostdev net,[tap|user|bridge|socket|vde],....  -guestdev net,....

If you have a built-in net device on your emulated board, you've got one
implied -guestdev net.  And similar principles apply to other things
like consoles and disks.

Now, guest and host terms may suck.  But please pick one terminology and
use it *everywhere*.  Documentation, code and cmdline.

Thanks,
Rusty.