On 04/15/2011 04:01 PM, Stefan Hajnoczi wrote:
I think SCSI brings many benefits. Guests can deal with it better
than these alien vdX virtio-blk devices, which makes migration easier.
It becomes possible to attach many disks without burning through free
PCI slots. We don't need to update guests to add cache control,
discard, and other commands because they are part of SCSI. We can
pass through more exotic devices. The list goes on...
And we also have to reimplement all of MMC. :)
A few questions:
1) Do you have anything posted for the virtio-scsi spec? I had started
working on one, but I haven't yet made it final. It included also
hotplug/unplug. I can send it out on Monday.
2) Have you thought about making scsi-disk and scsi-generic provide a
logical unit rather than a target? Otherwise passthrough of a whole
host or target becomes hard or messy.
3) Since I noticed Hannes is CCed, my next step for vmw_pvscsi would be
to dust off his patches to remove the bounce buffers, and see how they
apply to vmw_pvscsi. But I'd like to avoid duplicated work if possible.
Paolo
