libvirt users - Jun 2013 - virsh can create vHBA, but returen error msg "Node device not found"

Hi,

I am using the libvirt 1.0.6 with the patch applied: 
http://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=371c155

The problem I encountered is, with virsh comand 'nodedev-create 
/home/kvm/vHBA.xml', the vHBA can be generated as expected on the host, 
but error msg will show in the virsh shell:
libvirt: Node Device Driver error : Node device not found

I try to find the reason with gdb, and found that the 'nodedev-create' 
command will call virNetClientIOEventLoop() function of the remote 
driver, in this function, code will wait on:

  repoll:
         ret = poll(fds, ARRAY_CARDINALITY(fds), timeout);

after about 50s, poll() returns, but the replied 
msg->header.status=VIR_NET_ERROR.

I am not familiar with the rpc call in the remote driver, does anybody 
here can give some clues?

BRs,
Dennis

On 06/27/2013 04:51 PM, Dennis Chen wrote:
> Hi,
>
> I am using the libvirt 1.0.6 with the patch applied: 
> http://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=371c155
>
> The problem I encountered is, with virsh comand 'nodedev-create 
> /home/kvm/vHBA.xml', the vHBA can be generated as expected on the 
> host, but error msg will show in the virsh shell:
> libvirt: Node Device Driver error : Node device not found
>
> I try to find the reason with gdb, and found that the
'nodedev-create'
> command will call virNetClientIOEventLoop() function of the remote 
> driver, in this function, code will wait on:
>
>  repoll:
>         ret = poll(fds, ARRAY_CARDINALITY(fds), timeout);
>
> after about 50s, poll() returns, but the replied 
> msg->header.status=VIR_NET_ERROR.
>
> I am not familiar with the rpc call in the remote driver, does anybody 
> here can give some clues?
>
> BRs,
> Dennis
>
After investigation, find the root cause and fix it. Now it's OK to 
create a FC vHBA in my environment. Fixing can be found at:
https://www.redhat.com/archives/libvir-list/2013-June/msg01163.html