On 4/4/2018 5:45 PM, Stefan Hajnoczi wrote:
On Wed, Mar 28, 2018 at 07:25:21PM +0800, Liu, Jing2 wrote:
On 3/26/2018 6:12 PM, Liu, Jing2 wrote:
Hi Stefan,

Thank you very much for the response! It truly gave me much help.

On 3/24/2018 12:02 AM, Stefan Hajnoczi wrote:
[...]
Could you give me some help and thanks in advance!

Here is a script that launches nfsd and runs a guest:
https://github.com/stefanha/linux/commit/38cbc15661a6dd44b69c4f318091f2047d707035#diff-05f3fe8941076453942a8c059b409009


Using the script, I met some problems making the
initramfs.gz. It confused me a lot... I don't have busybox under
/usr/bin or /usr/sbin. Where to get it?


It may be easier to use a full guest disk image instead of the disk
image generation in my go.sh script.  The initramfs is very specific to
the development machine I was using at the time.  The main thing to look
at the in the go.sh script is how the NFS services are launched on the
host.

Busybox is a package that is available on most Linux distributions.

I realized the rhel-7.x doesn't has busybox anymore. And yes, I used some other image to continue.

Before you spend more time on this, NFS over AF_VSOCK is only suitable
for developers right now.  It is not ready for production and I am not
supporting it for end users.  So if you want to hack on NFS, please go
ahead, but otherwise it's probably not what you want.

Yes, so far we didn't plan for production. And thank you very much for your kind response.

Jing

Stefan

(host)$./go.sh nfs_tcp

File /usr/sbin/busybox could not be opened for reading
  line 55
File /lib64/libtirpc.so.3 could not be opened for reading
  line 306
File nc-vsock could not be opened for reading
  line 321
File ../netperf-2.7.0/src/netserver could not be opened for reading
  line 325

It results in guest kernel_panic when gdb launches the guest:

[    0.425738] Failed to execute /init (error -2)
[    0.426074] Kernel panic - not syncing: No working init found.  Try
passing .
[    0.427077] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0+ #3
[    0.427507] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-4
[    0.428354] Call Trace:
[    0.428538]  dump_stack+0x63/0x89
[    0.428774]  ? rest_init+0x60/0xc0
[    0.429017]  panic+0xeb/0x245
[    0.429225]  ? putname+0x53/0x60
[    0.429455]  ? rest_init+0xc0/0xc0
[    0.429722]  kernel_init+0xf1/0x104
[    0.430017]  ret_from_fork+0x25/0x30

Looking forward to the kind reply.
BTW, for the following questions that I sent two days ago, I have some
ideas in mind and it could be ignored now.

Jing

I have updated both host and guest kernel with vsock-nfsd repo and
installed nfs-utils in both host and guest successfully.

There're two different manuals in
https://www.spinics.net/lists/linux-nfs/msg64563.html(Quickstart 3~7)
and nfs-utils (README step 3 DAEMON STARTUP ORDER).
Which one should be the best usage?

For the first quickstart manual step 7-Mount the export from the guest,
two questions as follows.
1. why hypervisor's CID is 2? I didn't notice when it is specified?
2. Though I did step 3~7 successfully, I can't see the synchronistical
changing on host folder /export/ and guest /mnt? So how to test the
communcation between host and guest on the folder?

Thanks again!

Jing
[...]

Stefan




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