Re: Supporting out of tree custom vhost target modules

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Apr 23, 2025 at 11:47:49AM +0200, David George wrote:
> Hello all
> 
> I am in the process of writing an out of tree kernel module that does a very
> similar job to vhost_net.  The problem is that plain tap devices aren't quite
> going to cover what I want to do (1:N device mapping and various exotic
> offloads).
> 
> The approach I am taking at the moment is to tweak vhost/net.c to suit my needs
> and operate it as an out of tree module. The problem with this approach is the
> "vhost.h" is not in include/ so won't be usable without the whole source tree
> to compile against.
> 
> Is promoting vhost.h from drivers/vhost to include/xyz/ something that could be
> considered?
> 
> Alternatively, what I want to do could perhaps be done through an API to
> register a custom socket associated with a custom misc dev within vhost_net,
> but that is a lot more invasive.
> 
> Thanks,
> David George

See no good reason for that, that header is there so modules outside
of vhost don't use it by mistake.