linux-kernel - Re: [PATCH 00/25] Staging: hv: Cleanup vmbus driver code

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Date:	Sun, 1 May 2011 11:39:21 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Christoph Hellwig <hch@...radead.org>, Greg KH <greg@...ah.com>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>
Subject: Re: [PATCH 00/25] Staging: hv: Cleanup vmbus driver code

On Fri, Apr 29, 2011 at 04:32:35PM +0000, KY Srinivasan wrote:
> On the host-side, as part of configuring a guest  you can specify block devices
> as being under an IDE controller or under a
> SCSI controller. Those are the only options you have. Devices configured under
> the IDE controller cannot be seen in the guest under the emulated SCSI front-end which is
> the scsi driver (storvsc_drv). So, when you do a bus scan in the emulated scsi front-end,
> the devices enumerated will not include block devices configured under the IDE 
> controller. So, it is not clear to me how I can do what you are proposing given the 
> restrictions imposed by the host.

Just because a device is not reported by REPORT_LUNS doesn't mean you
can't talk to it using a SCSI LLDD.  We have SCSI transports with all
kinds of strange ways to discover devices.  Using scsi_add_device you
can add LUNs found by your own discovery methods, and use all the
existing scsi command handling.

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