Re: [Qemu-devel] [PATCH 00/16] QEMU vhost-scsi support

[Stefan Hajnoczi]

On Tue, Apr 24, 2012 at 8:05 AM, Paolo Bonzini <address@hidden> wrote:
> Il 24/04/2012 06:21, ronnie sahlberg ha scritto:
>> Hi Stefan,
>>
>> A little bit off-topic but
>>
>> When you design the proper place and API to plug virt-scsi into an
>> external SCSI parser outside of qemu like the target in the kernel ...
>>
>> It would be very nice if one could also plug virt-scsi into libiscsi
>> and pass the CDBs straight to the remote iSCSI target too.
>> Keep some thoughts on virt-scsi + libiscsi integration.
>
> Yes, that makes a lot of sense.  It's a bit harder than scsi-generic but
> we do want to get there.

Yep.  I think previously there was discussion about a libiscsi
SCSIDevice so that guest SCSI commands can be sent to libiscsi LUNs
without going through the QEMU block layer.  (Another way to pass
arbitrary SCSI commands to libiscsi is by hooking up .bdrv_aio_ioctl()
with SG_IO scsi-generic compatible code in block/iscsi.c.)

I think what you're describing now is one level higher: the libiscsi
target *is* the virtual SCSI target and virtio-scsi just ships off
commands to it?  This would be like a SCSIBus that is handle by
libiscsi target instead of emulated in QEMU.

Stefan