Re: [Qemu-devel] 9pfs troubles (was Re: [PATCH 1/4] hw/9pfs: fix error handing in local_ioc_getversion())

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Feb 07, 2014 at 10:02:52AM +0100, Greg Kurz wrote:
> On Wed, 5 Feb 2014 23:31:11 +0200
> "Michael S. Tsirkin" <mst@redhat.com> wrote:
> > On Tue, Feb 04, 2014 at 12:51:25PM +0530, Aneesh Kumar K.V wrote:
> > > "Michael S. Tsirkin" <mst@redhat.com> writes:
> > > 
> > > > On Mon, Feb 03, 2014 at 03:05:10PM +0530, Aneesh Kumar K.V wrote:
> > > >> "Michael S. Tsirkin" <mst@redhat.com> writes:
> > > >> 
> > > >> > Haven't used 9pfs in a while.
> > > >> > I thought these patches are a good time to play with it some more.
> > > >> > I have encountered two issues.
> > > >> >
> > > >> > What I'm doing:
> > > >> > host: qemu a75143eda2ddf581b51e96c000974bcdfe2cbd10.
> > > >> >
> > > >> > /scm/qemu/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1g -cpu
> > > >> > kvm64 -smp 2  f20-x64.qcow2  -netdev user,id=foo -redir
> > > >> > tcp:8022::22 -device virtio-net,netdev=foo  -serial stdio -fsdev
> > > >> > local,security_model=none,id=fsdev0,path=/lib/modules/ -device
> > > >> > virtio-9p-pci,id=fs0,fsdev=fsdev0,mount_tag=libmodulesshare -fsdev
> > > >> > local,security_model=none,id=fsdev1,path=/boot -device
> > > >> > virtio-9p-pci,id=fs1,fsdev=fsdev0,mount_tag=bootshare -no-reboot
> > > >> > -snapshot
> > > >> >
> > > >> > guest: Fedora 20
> > > >> >
> > > >> > added this in /etc/fstab:
> > > >> >
> > > >> > bootshare       /share/boot     9p
> > > >> > trans=virtio,version=9p2000.L 0 0
> > > >> > libmodulesshare /share/lib/modules      9p
> > > >> > trans=virtio,version=9p2000.L 0 0
> > > >> >
> > > >> >
> > > >> > I have encountered two issues:
> > > >> >
> > > >> > 1. mount failure on boot
> > > >> > If I try to mount on boot through fstab, I get:
> > > >> > [    2.270157] 9pnet: Could not find request transport: virtio
> > > >> > [    2.270158] 9pnet: Could not find request transport: virtio
> > > >> 
> > > >> 
> > > >> Missing 9pnet_virtio.ko module ? 
> > > >
> > > > Maybe it's loaded too late. But when I get to plymouth prompt
> > > > it's loaded fine.
> > 
> > Any idea about this one? Do you have guests with 9pfs
> > and virtio as modules and 9pfs mounted from /etc/fstab?
> > 
> 
> Hi Michael,
> 
> I had the very same problem. You probably need to add 9pnet_virtio to the
> initramfs. 
> 
> # mkinitrd -f --with=9pnet_virtio /boot/initramfs-$(uname -r).img $(uname -r)
> # gzip -dc /boot/initramfs-$(uname -r).img | cpio -t | grep 9pnet
> usr/lib/modules/3.11.7-200.fc19.ppc64p7/kernel/net/9p/9pnet_virtio.ko
> usr/lib/modules/3.11.7-200.fc19.ppc64p7/kernel/net/9p/9pnet.ko
> 
> Cheers.

This seems to help but why is this necessary
in the initrd?
After all I am not trying to boot from 9pfs.


> -- 
> Gregory Kurz                                     kurzgreg@fr.ibm.com
>                                                  gkurz@linux.vnet.ibm.com
> Software Engineer @ IBM/Meiosys                  http://www.ibm.com
> Tel +33 (0)562 165 496
> 
> "Anarchy is about taking complete responsibility for yourself."
>         Alan Moore.