[Virtio-fs] How to setup virtiofs for file sharing between host and VM

[Boris Ebwanga]

Hello!
I was able to modify the XML domain without errors.

Now, the guest failed to start. It shows this error message:
erreur :internal error: process exited while connecting to monitor:
2020-06-11T16:53:58.809703Z qemu-system-x86_64: -chardev
socket,id=char0,path=/home/deharteloos/tmp/vhost-fs.sock: Failed to connect
socket /home/deharteloos/tmp/vhost-fs.sock: Permission denied

I don't know how to solve this problem.


Le mar. 9 juin 2020 à 13:50, Stefan Hajnoczi <stefanha at redhat.com> a écrit :

> On Fri, Jun 05, 2020 at 11:50:06AM +0100, Boris Ebwanga wrote:
> > Hello everyone.
> >
> > It's been a while now, I am trying to use virtio-fs. Everything I do end
> up
> > with an error.
> >
> > First I was on fedora 31 and I tried to run manually qemu with virtio-fs
> > https://virtio-fs.gitlab.io/howto-qemu.html. But I was not able to "make
> > virtiofsd".
> >
> > Then, I upgraded to fedora 32 which has virtiofsd at /usr/libexec. I
> > followed the steps describe at
> > https://libvirt.org/kbase/virtiofs.html
> > I could not modify the XML domain of my VM. The error message is
> "*unsupported
> > configuration: unknown fs virtiofs » driver type".*
> >
> > I wrote to Stefan Hajnoczi <stefanha at redhat.com> describing this
> problem.
> > He answers with the following:
> >
> > Hi Boris,
> > > You can pass command-line options to the guest like this:
> > >
> > >   <domain type='kvm' xmlns:qemu='
> > > http://libvirt.org/schemas/domain/qemu/1.0'>
> > >     ...
> > >     <qemu:commandline>
> > >       <qemu:arg value='-chardev'/>
> > >       <qemu:arg value='socket,id=char0,path=/tmp/vhost-fs.sock'/>
> > >       <qemu:arg value='-device'/>
> > >       <qemu:arg
> > > value='vhost-user-fs-pci,chardev=virtio-fs-chardev,tag=myfs'/>
> > >     </qemu:commandline>
> > >   </domain>
> > >
> > > Note that the xmlns in the <domain> tag is required.
> > >
> > > If you pass these options manually then you need to launch virtiofsd
> > > yourself before launching the guest:
> > >
> > >   # /usr/libexec/virtiofsd --socket-path=/tmp/vhost-fs.sock -o
> > > source=/path/to/share/dir -o no_posix_lock -o xattr
> > >
> > > Hope this helps! Please email virtio-fs at redhat.com if you have any
> more
> > > questions, it's the virtio-fs mailing list and others will be able to
> > > participate in the discussion.
> > >
> >
> > I am still getting the same error after applying the change above.
> >
> > Can anyone help me with this ? Thank you in advance for your help.
>
> Hi Boris,
> The "unknown fs virtiofs" error shouldn't happen if you the
> <qemu:commandline> syntax. Could it be that there is still a <filesystem
> type='mount' accessmode='passthrough'> XML tag from a previous attempt?
>
> Please post the full domain XML (virsh dumpxml <domain>) so we can
> suggest how to fix it.
>
> Stefan
>
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