Re: [Qemu-devel] qemu virtfs 9p not working on arm?

[Peter Maydell]

On 1 August 2013 00:25, Rich Felker <address@hidden> wrote:
> I'm not sure whether this is a kernel problem or a qemu problem (or
> even a user problem). The folks on OFTC #qemu suggested I email the
> list and relevant section maintainers so that's what I'm doing -- hope
> it's okay.
>
> I'm trying to boot qemu-system-arm with rootfs on 9p, and experiencing
> the following error:

You don't say which board model you're using; I guess one
of the PCI ones from the rest of the command line.

> | 9pnet: Installing 9P2000 support
> | 9pnet_virtio: probe of virtio0 failed with error -2
> | VFP support v0.3: implementor 41 architecture 1 part 20 variant b rev 4
> | rtc-pl031 dev:e8: setting system clock to 2013-07-31 22:56:25 UTC 
> (1375311385)
> | 9pnet_virtio: no channels available
> | VFS: Cannot open root device "root" or unknown-block(0,0): error -2
> | Please append a correct "root=" boot option; here are the available 
> partitions:
> | 0b00         1048575 sr0  driver: sr
> | Kernel panic - not syncing: VFS: Unable to mount root fs on 
> unknown-block(0,0)
>
> That looks like ENOENT during the probe to me, but I can't find where
> in the kernel source it's coming from. My configuration is:
>
> -append "root=root rw rootflags=rw,trans=virtio,version=9p2000.L 
> -rootfstype=9p"
> -fsdev local,id=root,path=$(pwd)/root,security_model=none
> -device virtio-9p-pci,fsdev=root,mount_tag=root
>
> and this same configuration seems to work on x86. The kernels I'm
> using are from the latest Aboriginal Linux images (3.10) and
> /proc/config.gz seems to show that all the 9p/virtfs options are
> enabled.

Do other virtio devices work?

-- PMM