[Virtio-fs] Getting help setting up virtiofs guest

[Dr. David Alan Gilbert]

* Dr. David Alan Gilbert (dgilbert at redhat.com) wrote:
> * David Lomas (dl3 at pale-eds.co.uk) wrote:
> > Just to say thanks to Dave (all the best people are called Dave) for the
> > pointer to use kernel 5.7. That just worked on the guest, and I can now see
> > the host filesystem.
> > 
> > Perhaps this page <https://virtio-fs.gitlab.io/howto-qemu.html> should just
> > link to the mainline kernel rather than the virtio-fs one?
> 
> Oops yes! We need to update to say you can either use upstream, or use
> the virtio-fs-dev branch of that git.

Fixed.

> Dave
> 
> > 
> > 
> > On Thu, Jun 11, 2020 at 8:11 PM Dr. David Alan Gilbert <dgilbert at redhat.com>
> > wrote:
> > 
> > > * David Lomas (dl3 at pale-eds.co.uk) wrote:
> > > > Apologies if this isn't the correct place for this kind or request.
> > >
> > > It's the right place to ask.
> > >
> > > > I've been following these instructions to set up host and guest:
> > > > https://virtio-fs.gitlab.io/howto-qemu.html and
> > > > https://libvirt.org/kbase/virtiofs.html
> > > >
> > > > On the host, I've built the latest version of libvirt (6.4.0) and qemu
> > > > (5.0.0), and added sections to the domain definition. All appears well
> > > (no
> > > > errors at least). This is the relevant section:
> > > >
> > > >     <filesystem type='mount' accessmode='passthrough'>
> > > >       <driver type='virtiofs'/>
> > > >       <binary path='/usr/libexec/virtiofsd'/>
> > > >       <source dir='/fast_data/test'/>
> > > >       <target dir='test'/>
> > > >       <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
> > > > function='0x0'/>
> > > >     </filesystem>
> > >
> > > I think that's OK.
> > >
> > > > On the guest, I've build the kernel (4.19.28), booted it, and confirmed
> > > > virtio_fs.ko is a built-in module.
> > >
> > > Where did you get that kernel?  It sounds rather old;  the main part of
> > > virtiofs is now in the upstream kernel; so if your distro has a recent
> > > 5.x kernel, you can just use it.
> > >
> > > > But on running mount -t virtio_fs test /mnt/test/ I get the following
> > > error:
> > > >
> > > > mount: /mnt/test: wrong fs type, bad option, bad superblock on
> > > qube-server,
> > > > missing codepage or helper program, or other error.
> > > >
> > > > Note both those web pages above suggest using mount -t virtiofs, but that
> > > > gives unknown filesystem type 'virtiofs'
> > >
> > > It changed in the newer kernels to the 'virtiofs'.
> > >
> > > > I'm at a loss to find more detailed information on how to configure
> > > > this—are there other resources online, or can anyone suggest what to try
> > > > next?
> > >
> > > I suspect you're suffering from the older kernel here.  Try a nice
> > > shiny new one.
> > >
> > > Dave
> > >
> > > > Thanks!
> > >
> > > > _______________________________________________
> > > > Virtio-fs mailing list
> > > > Virtio-fs at redhat.com
> > > > https://www.redhat.com/mailman/listinfo/virtio-fs
> > >
> > > --
> > > Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK
> > >
> > >
> 
> > _______________________________________________
> > Virtio-fs mailing list
> > Virtio-fs at redhat.com
> > https://www.redhat.com/mailman/listinfo/virtio-fs
> 
> --
> Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK
> 
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--
Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK