linux-kernel - Re: [RFC PATCH 11/13] vsock: add 'transport

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Message-ID: <20191009131643.GL5747@stefanha-x1.localdomain>
Date:   Wed, 9 Oct 2019 14:16:43 +0100
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     netdev@...r.kernel.org, Sasha Levin <sashal@...nel.org>,
        linux-hyperv@...r.kernel.org,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        kvm@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jorgen Hansen <jhansen@...are.com>
Subject: Re: [RFC PATCH 11/13] vsock: add 'transport_hg' to handle g2h\h2g
 transports

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?

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