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I am trying to mount a shared folder using qemu-kvm/9p and it fails to work if I add it to the fstab file. I get an error at boot that the device cannot be mounted, yet after start if I run "mount -a" the device will be mounted.

fstab line:

src_mnt /src 9p trans=virtio 0 0

From dmesg I can see:

[    7.606258] 9p: Could not find request transport: virtio

And a few lines later I see the "virtio-pci" entries. I'm not clear on how I would defer mounting until that device is available however.

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2 Answers 2

Don't know if it's the ideal solution, but on an Ubuntu 12.04 guest I got it to work by adding the 9p modules to the initramfs.

Added to /etc/initramfs-tools/modules:

9p
9pnet
9pnet_virtio

Then:

sudo update-initramfs -u
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Thank you - I think its reasonable to say this is the ideal solution. The problem is that the module is not mounted during file-system mount, your solution is to add it to the list of modules loaded at mount-time. –  Greg Apr 4 '13 at 10:28

On Ubuntu 14.04 only the 9pnet_virtio module needs preloading as per bhassel's answer.

The dmesg a few lines before the quoted one shows that the other two are already loaded but cannot find the required transport.

[ 1.370611] 9pnet: Installing 9P2000 support 
[ 1.376384] 9p: Installing v9fs 9p2000 file system support 
[ 1.376754] 9pnet: Could not find request transport: virtio 

Tested with Ubuntu 14.04 guest on qemu/KVM on openSUSE 13.2.

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Hi Tim, and welcome to the site. Keep in mind that the ordering of the answers can change both by community voting as well as user preferences, so try to always be explicit about which answer you are referring to. I have fixed this for now in your post; please do so yourself in the future. Thanks! –  Michael Kjörling Feb 17 at 15:50

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