From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Hajnoczi <stefanha@gmail.com>
Subject: Re: [RFC PATCH 11/13] vsock: add 'transport_hg' to handle g2h\h2g
	transports
Date: Wed, 9 Oct 2019 14:16:43 +0100
Message-ID: <20191009131643.GL5747__31875.6359441736$1570627019$gmane$org@stefanha-x1.localdomain>
References: <20190927112703.17745-1-sgarzare@redhat.com>
	<20190927112703.17745-12-sgarzare@redhat.com>
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To: Stefano Garzarella <sgarzare@redhat.com>
Cc: Sasha Levin <sashal@kernel.org>, linux-hyperv@vger.kernel.org, Stephen Hemminger <sthemmin@microsoft.com>, kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>, netdev@vger.kernel.org, Haiyang Zhang <haiyangz@microsoft.com>, Dexuan Cui <decui@microsoft.com>, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Stefan Hajnoczi <stefanha@redhat.com>, "David S. Miller" <davem@davemloft.net>, Jorgen Hansen <jhansen@vmware.com>
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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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