Re: [Xen-devel] [RFC] VirtFS support on Xen

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jan 22, 2016 at 06:45:30PM +0800, Bob Liu wrote:
> Hi Wei,
> 
> On 01/21/2016 06:59 PM, Wei Liu wrote:
> > On Thu, Jan 21, 2016 at 10:50:08AM +0000, David Vrabel wrote:
> >> On 21/01/16 10:28, Wei Liu wrote:
> >>> [RFC] VirtFS support on Xen
> >>>
> >>> # Introduction
> >>>
> >>> QEMU/KVM supports file system passthrough via an interface called
> >>> VirtFS [0]. VirtFS is in turn implemented with 9pfs protocol [1] and
> >>> VirtIO transport.
> >>>
> >>> Xen used to have its own implementation of file system passthrough
> >>> called XenFS, but that has been inactive for a few years. The latest
> >>> update was in 2009 [2].
> >>>
> >>> This project aims to add VirtFS support on Xen. This is more
> >>> sustainable than inventing our own wheel.#
> >>
> >> What's the use case for this?  Who wants this feature?
> >>
> > 
> > Anyone who wants file system passthrough.  More specifically, VM-based
> > container solutions can share files from host file system.
> > 
> 
> I'm a bit confused, can't we just use the VirtFS of Qemu?
> E.g
> ./configure --with-extra-qemuu-configure-args="--enable-virtfs"
> 

Yes, in theory you can -- with VirtIO transport. But I'm not sure if
Virtio has been fixed to work with Xen.  That also means you need QEMU
emulation, which we don't really need (or want) when running in PV or
PVH mode.


Wei.


> Thanks,
> Bob
> 
> > http://xendevsummit2015.sched.org/event/3WDg/xen-containers-better-way-to-run-docker-containers-sainath-grandhi-intel?iframe=no&w=&sidebar=yes&bg=no
> > http://xendevsummit2015.sched.org/event/3X1L/hyper-make-vm-run-like-containers-xu-wang-hyper?iframe=no&w=&sidebar=yes&bg=no
> > 
> > Wei.
> > 

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