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Date:   Wed, 6 Sep 2017 14:11:22 +0000
From:   "Jorgen S. Hansen" <>
To:     Stefan Hajnoczi <>
CC:     Dexuan Cui <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        KY Srinivasan <>,
        Haiyang Zhang <>,
        "Stephen Hemminger" <>,
        George Zhang <>,
        Michal Kubecek <>, Asias He <>,
        "Vitaly Kuznetsov" <>,
        Cathy Avery <>,
        "" <>,
        Rolf Neugebauer <>,
        Dave Scott <>,
        "Marcelo Cerri" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        Dan Carpenter <>
Subject: Re: [PATCH] vsock: only load vmci transport on VMware hypervisor by

> On Aug 31, 2017, at 1:54 PM, Stefan Hajnoczi <> wrote:
> On Tue, Aug 29, 2017 at 03:37:07PM +0000, Jorgen S. Hansen wrote:
>>> On Aug 29, 2017, at 4:36 AM, Dexuan Cui <> 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.

Yes, that was my thinking as well.

> 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.

I’ll try to find time to write a more coherent proposal in the coming weeks,
and we can discuss that.

> 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?

No, I won’t be there.


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