RE: [Xen-devel] [RFC] [0/4] PV driver for FC transport layer

["Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>]

> We developed a prototype of para-virtual FC(Fibre Channel) SCSI
driver.
> It's a extension of the "pv-scsi" driver, that Horikoshi-san posted on
> 16 May 2007 ([Xen-devel] [RFC] pv-scsi driver (scsiback/scsifront)),
> in order to support FC transport layer.

I'm struggling slightly to understand the usage scenario planned for
this stuff. Mapping a SCSI LUN through to a guest makes perfect sense
(e.g. for performing SCSI reservations, special SCSI commands like FUA,
controlling a tape robot etc), but mapping a whole HBA through to a
guest seems less useful -- usually it's the case you want to hide all
that nastiness from the guest, taking care of multipath etc in dom0
rather than exposing it to the guest. 

Have you a particular scenario in mind? 

Thanks,
Ian

 
> The FC extension mainly performs following processes.
> 
> 1. Copies FC attributes stored in Dom0 to DomU at the driver
>    initialization phase. The attributes are originally stored in
>    "Scsi_Host", "scsi_target" and "fc_rport" structures.
> 2. When /sys/class/fc_*/*/* on DomU is accessed from user land,
performs
>    appropriate function on Dom0.
> 
> We expect your helpful comments especially at following point of view.
> 
> - What any other functions are required in order to behave as
"complete"
>   FC driver? (We are not familiar with FC driver.)
> - This is the sub-question of above. Current prototype supports only
>   "frontend driven" functions. What types of "backend driven"
functions
>   we have to support?
> 
> Any other comments are welcomed.
> 
> Best regards
> 
> -----
> Jun Kamada
> Linux Technology Development Div.
> Server Systems Unit
> Fujitsu Ltd.
> kama@xxxxxxxxxxxxxx
> 
> 
> 
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