Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support

[Christian Borntraeger]

Am Tuesday 28 April 2009 11:51:54 schrieb Christoph Hellwig:
> Not quite yet.  Eventually I want to support a virtio-scsi kind of
> transport which would use the same virtio-blk protocol but only send
> scsi commands.  We'd need a different driver on the Linux side for
> it that registers to the scsi layer.  On the QEMU side it could either
> do pass-through to a real scsi device using SG_IO or use the existing

Yes, virtio-scsi is also something we were thinking of. The last time we 
discussed this idea of SCSI passthrough internally, we stumbled over error 
recovery. Who is responsible for the error recovery? The host, the guest, or 
both? Are there problems, which will trigger error recovery in the guest and 
host midlayer at the same time? To be honest, my scsi knowledge is very 
limited, so I dont know if that is a real problem.

Christian