[Virtio-fs] Getting help setting up virtiofs guest

[Dr. David Alan Gilbert]

* 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!

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--
Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK