On Tuesday 03 April 2007, Jeremy Fitzhardinge wrote: > > Doing a SCSI driver has been tried before, with ibmvscsi. Not good. > > > > OK, interesting. People had proposed using SCSI as the interface, but I > wasn't aware of any results from doing that. How is it not good? > SCSI is really overengineered for something as simple as a block interface. A large part of the SCSI stack deals only with error handling, which you don't want to burden the guests with at all, since most error conditions can be handled fine by the host. Another big aspect of SCSI is device enumeration and probing. Doing it the SCSI way is particularly pointless. It's much simpler to have one device with its own I/O interface at the hcall layer, and one interrupt number for the block device, instead of faking the full hca/bus/dev/lun hierarchy. Arnd <>< _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
