Open Stack

On Wed, Dec 19, 2018 at 01:21:25AM +0800, Xu Wang wrote:
> On Wed, Dec 19, 2018, 00:27 Stefan Hajnoczi <stefanha at redhat.com wrote:
> 
> > On Tue, Dec 18, 2018 at 12:07:32AM +0800, Tao Peng wrote:
> > > On Tue, Dec 11, 2018 at 3:25 AM Stefan Hajnoczi <stefanha at redhat.com>
> > wrote:
> > > >
> > > > Dear Kata Containers Community,
> > > > I'm delighted to announce the first release of virtio-fs, a new shared
> > > > file system for virtual machines that is designed for container use
> > > > cases, including shared volumes.
> > >
> > > One more question, is there plan to support hotplug a virtio-fs device
> > > to the guest? Or is it already supported?
> >
> > Yes, hotplug is planned.  It's not tested yet but may already work at
> > the QEMU level.
> >
> > How would you like to use hotplug at the Kata level?
> >
> 
> 
> With 9pfs, we configure a specified shared dir for virtfs and bind the
> files/dirs we want to share in the specified one. And we can't turn it off
> even if we have nothing to share in one pod, which may imply some security
> risks. The reason behind the activity is that 9pfs doesn't support hotplug,
> on the other hand, we hotplug the block devices.
> 
> Then if virtio-fs support hotplug, we may hotplug any dirs we want to share
> with the guest instead of bind mount them to such a indirect places.
> 
> However, the bind mount operation should be much faster than a hotplug
> attempt. We still need to make trade-off to use hotplug or keep the current
> 9p-like sharing configuration.

I see.  The current patches follow the 9pfs model but hotplug should be
doable in the future, too.

Stefan
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