Re: [Qemu-devel] [Consult] nfs-vsocks support

["Liu, Jing2" <jing2.liu@linux.intel.com>]

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:
> On Fri, Mar 23, 2018 at 05:54:53PM +0800, Liu, Jing2 wrote:
>> I am currently trying to use nfs-vsocks on x86 for vitural machine
>> filesystem by some manuals on
>> https://www.spinics.net/lists/linux-nfs/msg64563.html
>> and https://lwn.net/Articles/647516/
>>
[...]
> 
>> 3. For the 5th step (Start nfsd), I'd like to know the rpc.nfsd --vsock is
>> enabled by which codes? Is it the CONFIG_VHOST_VSOCK kernel module in host?
>> Because I installed the kernel with vsock-nfs repo with the specified config
>> options but failed to do rpc.nfsd --vsock.
>>
>>
>> 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

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

> 
> Regarding rpc.nfsd, on my Fedora 27 system rfc.nfsd is launched by
> /usr/lib/systemd/system/nfs.service.  When developing NFS over AF_VSOCK
> I disable the NFS service and launch nfsd manually from the script
> above.
> 
> Stefan
>