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Date: Fri, 15 Apr 2011 16:17:20 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [RFC PATCH] implement vmware pvscsi device
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To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Hannes Reinecke <hare@suse.de>, qemu-devel@nongnu.org, "Nicholas A. Bellinger" <nab@linux-iscsi.org>, "Michael S. Tsirkin" <mst@redhat.com>

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