Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

[ronnie sahlberg]

On Tue, Feb 14, 2012 at 12:00 AM, Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
> On Mon, Feb 13, 2012 at 02:54:03PM +0200, Dor Laor wrote:
>> Only if you use the pci multi-function option but that kills
>> standard hot unplug
>
> It doesn't kill it as such, rather you can't unplug luns individually.

Isnt that just a consequence of the current implementation rather than
a SCSI limitation?

A different way to do hoplug could be to flag all devices as removable
in the standard inq page then
leave the LUN there persistently and what you remove/add is not the
LUN device itself but just the media in the device.

Instead of hot-plug remove the LUN,  hot-plug becomes "media eject" or
"media insert".
The device remains present all time, you never remove it, but instead
hot-plug controls if the media is present or not.


This would require implementing at least START_STOP_UNIT and
PREVENT_ALLOW_MEDIUM_REMOVAL opcode emulation from SBC.


regards
ronnie sahlberg
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