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

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Date:	Mon, 13 Feb 2012 15:18:48 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	ronnie sahlberg <ronniesahlberg@...il.com>
Cc:	Dor Laor <dlaor@...hat.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christian Hoff <christian.hoff@...ibm.com>,
	borntrae@...ux.vnet.ibm.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	rusty@...tcorp.com.au, Stefan Hajnoczi <stefanha@...il.com>,
	target-devel <target-devel@...r.kernel.org>
Subject: Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

On Tue, Feb 14, 2012 at 12:13:36AM +1100, ronnie sahlberg wrote:
> On Tue, Feb 14, 2012 at 12:00 AM, Michael S. Tsirkin <mst@...hat.com> 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?

Yes.

> 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

That would work.
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