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