Re: [RFC PATCH 11/13] vsock: add 'transport_hg' to handle g2h\h2g transports

On Wed, Oct 09, 2019 at 02:16:43PM +0100, Stefan Hajnoczi wrote:

On Fri, Sep 27, 2019 at 01:27:01PM +0200, Stefano Garzarella wrote:

quoted

VMCI transport provides both g2h and h2g behaviors in a single
transport.
We are able to set (or not) the g2h behavior, detecting if we
are in a VMware guest (or not), but the h2g feature is always set.
This prevents to load other h2g transports while we are in a
VMware guest.

In the vhost_vsock.ko case we only register the h2g transport when
userspace has loaded the module (by opening /dev/vhost-vsock).

VMCI has something kind of similar: /dev/vmci and the
vmci_host_active_users counter.  Maybe we can use this instead of
introducing the transport_hg concept?

Yes, maybe we can register the host in the vmci_host_do_init_context().

I also don't like a lot the transport_hg concept, so I'll try to found
an alternative.

Thanks,
Stefano