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Re: [Qemu-devel] Playing with virtfs.
From: |
Aneesh Kumar K. V |
Subject: |
Re: [Qemu-devel] Playing with virtfs. |
Date: |
Mon, 24 Jan 2011 21:45:31 +0530 |
User-agent: |
Notmuch/0.5-32-gf6c60cc (http://notmuchmail.org) Emacs/23.1.1 (i486-pc-linux-gnu) |
On Sun, 23 Jan 2011 13:33:14 -0600, Rob Landley <address@hidden> wrote:
> Using yesterday's -git, following the instructions in
> http://wiki.qemu.org/Documentation/9psetup (which is missing a kernel
> symbol, you need to add CONFIG_VIRTIO_PCI to your kernel too), I managed
> to mount a read-only virtfs filesystem, adding this to the
> qemu-system-x86_64 command line:
With top of the kernel tree 52cfd503ad7176d23a5dd7af3981744feb60622f
I am able to build the kernel without CONFIG_VIRTIO_PCI. What is the
exact error you are finding ?
>
> -virtfs
> local,security_model=passthrough,mount_tag=kvm,path=/home/landley/9ptest
>
> And then in the emulated Linux:
>
> address@hidden:~# mount -t 9p -o trans=virtio,version=9p2000.L kvm woot
> address@hidden:~# ls -l woot
> total 80
> -rw-r--r-- 1 1000 1000 77874 Jan 22 23:33 config-linux
> address@hidden:~# cd woot
> address@hidden:~/woot# touch fred
> touch: setting times of `fred': No such file or directory
> address@hidden:~/woot#
>
> I.E. It seems to work fine read only, but changes are discarded.
>
> Am I doing something wrong, or is this expected? (If so, when is write
> support likely to go in?)
>
Are you running qemu as root ? Using passthrough security model require
the ability to change the ownership of the file. Otherwise you can use
security=none, but the credentials with which files are created will
not be correct.
-aneesh