Re: [Qemu-devel] virtfs error reporting?

[M. Mohan Kumar]

On Monday 25 April 2011 1:01:38 am Rob Landley wrote:

> So on the host side I'm trying to do this:

>

> $ qemu -cpu pentium3 -nographic -no-reboot -kernel bzImage \

> -hda hda.sqf -append 'root=/dev/hda rw init=/sbin/init.sh panic=1 \

> PATH=/bin:/sbin console=ttyS0 HOST=i686 ' -net nic,model=e1000 \

> -net user -virtfs

> local,path=../root-filesystem-i686,security_model=mapped,mount_tag=root

>

> And on the guest side I'm trying to do this:

>

> mount -t 9p -o ro,trans=virtio,version=9p2000.L root /mnt

>

> And it's saying:

>

> mount: mounting root on /mnt failed: No such device

>

> No idea what I'm doing wrong, "no such device" is not an informative

> error message.

>

> There's no obvious way to get the Linux client to tell me what tags

> are available. "What can I mount? Do you see anything?" I've

> looked under /proc and /sys for "virtio"... It's entirely possible

> I'm missing something in my kernel .config but who knows what?

You can get available tags from

/sys/devices/virtio-pci/virtio*/mount_tag

>

> I note that qemu was sitting down and SULKING unless I specified the

> security_model (I'm mounting read only, I don't care, but there

> doesn't seem to be any way to DO a read-only export). I'm guessing

> based on the fact it stopped complaining that it is in fact exporting

> something (and thus not upset I gave it a relative path, although giving

> it an absolute path made no difference...)

>

> Any clues?

>

> Rob

----

M. Mohan Kumar