Re: [Qemu-devel] virtfs error reporting?

["M. Mohan Kumar" <mohan@in.ibm.com>]

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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

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