[libvirt] [PATCH v4 9/9] docs: Add vhost-scsi

[Jim Fehlig]

On 11/22/2016 02:16 PM, John Ferlan wrote:
>
>
> On 11/21/2016 10:58 PM, Eric Farman wrote:
>> Signed-off-by: Eric Farman <farman at linux.vnet.ibm.com>
>> ---
>>  docs/formatdomain.html.in | 24 ++++++++++++++++++++++++
>>  1 file changed, 24 insertions(+)
>>
>
> This will get squashed in with the conf patch. I'll also generate the
> news.html.in entry:
>
>           <li>vhost-scsi: Add support scsi_host hostdev passthrough<br/>
>           Add the capability to pass through a scsi_host HBA and the
>           associated LUNs to the guest.
>           </li>
>
>
> ACK -
>
> I'll push these in a bit, just seeing what I get on my test system... Of
> course I'm also curious what would happen if I try to pass through a
> vHBA ;-)...

I have unsuccessfully tried it, but not sure how to correctly specify the vHBA 
in domXML.

First, create a vHBA:
cat vhba.xml
<device>
    <parent_wwpn>2100001b32847342</parent_wwpn>
    <parent_wwnn>2000001b32847342</parent_wwnn>
    <capability type='scsi_host'>
      <capability type='fc_host'>
       <wwnn>9990100000000001</wwnn>
       <wwpn>9990000000000001</wwpn>
       </capability>
    </capability>
</device>
virsh nodedev-create vhba.xml

(@John: Notice I'm using your "Allow creation of vHBA by parent_wwnn/wwpn or 
fabric_name" series. I'll try to respond with review comments on that series 
tomorrow.)

Add the vHBA to domain config using a variant of Eric's example:
   <hostdev mode='subsystem' type='scsi_host'>
     <source protocol='vhost' wwpn='naa.9990000000000001'/>
     <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x1000'/>
   </hostdev>

Start the VM:
virsh start test
error: Failed to start domain test
error: Path '/sys/kernel/config/target/vhost//naa.5001405df3e54061' is not 
accessible: No such file or directory

It looks like this patch series only handles scsi_host created with targetcli, 
but I didn't look at all the patches closely. Is it possible to use vhost-scsi 
with NPIV vport (vHBA)? If so, any pointers on how to specify the vHBA in 
<hostdev> element?

Regards,
Jim