[Rust-VMM] Crate for vhost-user device backend?

[Dr. David Alan Gilbert]

* Liu, Jing2 (jing2.liu at linux.intel.com) wrote:
> 
> 
> On 1/18/2019 1:07 AM, Boeuf, Sebastien wrote:
> > On Thu, 2019-01-17 at 16:59 +0000, Dr. David Alan Gilbert wrote:
> > > * Jiang Liu (liuj97 at gmail.com) wrote:
> > > > 
> > > > 
> > > > > On Jan 17, 2019, at 11:00 PM, Liu, Jing2 <
> > > > > jing2.liu at linux.intel.com> wrote:
> > > > > 
> > > > > Hi Jiang,
> > > > > 
> > > > > On 1/17/2019 7:32 PM, Jiang Liu wrote:
> > > > > > > On Jan 17, 2019, at 7:30 PM, Dr. David Alan Gilbert <
> > > > > > > dgilbert at redhat.com> wrote:
> > > > > > > 
> > > > > > > * Jiang Liu (liuj97 at gmail.com) wrote:
> > > > > > > > 
> > > > > > > > 
> > > > > > > > > On Jan 17, 2019, at 6:58 PM, Marc-André Lureau <
> > > > > > > > > marcandre.lureau at gmail.com> wrote:
> > > > > > > > > 
> > > > > > > > > Hi
> > > > > > > > > 
> > > > > > > > > On Thu, Jan 17, 2019 at 2:56 PM Jiang Liu <
> > > > > > > > > liuj97 at gmail.com <mailto:liuj97 at gmail.com>> wrote:
> > > > > > > > > > 
> > > > > > > > > > We are working on a vhostuser-rs crate, and planned to
> > > > > > > > > > posted it for RFC later.
> > > > > > > > > 
> > > > > > > > > Great news! Looking forward for it! Feel free to share
> > > > > > > > > WIP if you want help.
> > > > > > > > > 
> > > > > > > > > > 
> > > > > > > > > > > On Jan 17, 2019, at 6:52 PM, Stefan Hajnoczi <
> > > > > > > > > > > stefanha at redhat.com> wrote:
> > > > > > > > > > > 
> > > > > > > > > > > Hi,
> > > > > > > > > > > Has anyone implemented a vhost-user device backend in
> > > > > > > > > > > Rust?
> > > > > > > > > > > 
> > > > > > > > > > > QEMU's libvhost-user and DPDK's librte_vhost are C
> > > > > > > > > > > implementations that
> > > > > > > > > > > provide a device backend API.  They allow you to
> > > > > > > > > > > implement
> > > > > > > > > > > vhost-user-net, vhost-user-blk, and vhost-user-scsi
> > > > > > > > > > > devices as a
> > > > > > > > > > > separate process from the main emulator.
> > > > > > > > 
> > > > > > > > We are working on this direction, but  enhancements to
> > > > > > > > firecracker/rust-vmm are need to support
> > > > > > > > vhostuser. For example we need to support memfd based
> > > > > > > > memory slot management. It’s really
> > > > > > > > great if we could cooperate on it.
> > > > > > > 
> > > > > > > Are you working on it for the hypervisor side, or the device
> > > > > > > side, or
> > > > > > > both?
> > > > > > 
> > > > > > Currently we are focusing on the hypervisor side and vhostuser
> > > > > > transport layer. No work on the virtio backend device yet.
> > > > > 
> > > > > What application will be the virtio backend on your scenario?
> > > > > 
> > > > 
> > > > Hi Jing,
> > > > 	Net and blk/scsi backends should be enough for most cases.
> > > 
> > > It would be interesting for us to be able to wire virtio-fs to
> > > firecracker, and it would also be interesting to do a Rust filesystem
> > > client.
> > 
> > +1 here! Something that would be very useful to build a rust-vmm
> > hypervisor with filesystem sharing support (and that is not 9p
> > obviously).
> ++ too! I seems all the vhost-user device emulation, backend emulation and
> socket channel needs to be implemented. Not a small job I think :-p

It seems like the first step would be to produce a crate with just the
protocol definitions in for vhost-user - has anyone already done that?

Dave

> Jing
> 
> > 
> > > 
> > > Dave
> > > 
> > > > 
> > > > > Jing
> > > > > 
> > > > > > > 
> > > > > > > Dave
> > > > > > > 
> > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > > Stefan
> > > > > > > > > > > _______________________________________________
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> > > > > > > > > > 
> > > > > > > > > > 
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> > > > > > > > > >   <
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> > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > -- 
> > > > > > > > > Marc-André Lureau
> > > > > > > > _______________________________________________
> > > > > > > > Rust-vmm mailing list
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> > > > > > > > http://lists.opendev.org/cgi-bin/mailman/listinfo/rust-vmm
> > > > > > > 
> > > > > > > --
> > > > > > > Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK
> > > > > > 
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> > > 
> > > --
> > > Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK
> > > 
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--
Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK