linux-kernel - Re: [PATCH] vsock: only load vmci transport on VMware hypervisor by default

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Message-ID: <20170831115455.GP13619@stefanha-x1.localdomain>
Date:   Thu, 31 Aug 2017 12:54:55 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     "Jorgen S. Hansen" <jhansen@...are.com>
Cc:     Dexuan Cui <decui@...rosoft.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        George Zhang <georgezhang@...are.com>,
        Michal Kubecek <mkubecek@...e.cz>, Asias He <asias@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Cathy Avery <cavery@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        Rolf Neugebauer <rolf.neugebauer@...ker.com>,
        Dave Scott <dave.scott@...ker.com>,
        Marcelo Cerri <marcelo.cerri@...onical.com>,
        "apw@...onical.com" <apw@...onical.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "joe@...ches.com" <joe@...ches.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH] vsock: only load vmci transport on VMware hypervisor by
 default

On Tue, Aug 29, 2017 at 03:37:07PM +0000, Jorgen S. Hansen wrote:
> > On Aug 29, 2017, at 4:36 AM, Dexuan Cui <decui@...rosoft.com> wrote:
> If we allow multiple host side transports, virtio host side support and
> vmci should be able to coexist regardless of the order of initialization.

That sounds good to me.

This means af_vsock.c needs to be aware of CID allocation.  Currently the
vhost_vsock.ko driver handles this itself (it keeps a list of CIDs and
checks that they are not used twice).  It should be possible to move
that state into af_vsock.c so we have <cid, host_transport> pairs.

I'm currently working on NFS over AF_VSOCK and sock_diag support (for
ss(8) and netstat-like tools).

Multi-transport support is lower priority for me at the moment.  I'm
happy to review patches though.  If there is no progress on this by the
end of the year then I will have time to work on it.

Are either of you are in Prague, Czech Republic on October 25-27 for
Linux Kernel Summit, Open Source Summit Europe, Embedded Linux
Conference Europe, KVM Forum, or MesosCon Europe?

Stefan