linux-kernel - Re: virtio scsi host draft specification, v3

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Message-ID: <20110629102750.GA11648@infradead.org>
Date:	Wed, 29 Jun 2011 06:27:50 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Hannes Reinecke <hare@...e.de>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Stefan Hajnoczi <stefanha@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <chellwig@...hat.com>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	kvm@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>,
	qemu-devel <qemu-devel@...gnu.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Subject: Re: virtio scsi host draft specification, v3

On Wed, Jun 29, 2011 at 12:23:38PM +0200, Hannes Reinecke wrote:
> The general idea here is that we can support NPIV.
> With NPIV we'll have several scsi_hosts, each of which is assigned a
> different set of LUNs by the array.
> With virtio we need to able to react on LUN remapping on the array
> side, ie we need to be able to issue a 'REPORT LUNS' command and
> add/remove LUNs on the fly. This means we have to expose the
> scsi_host in some way via virtio.
> 
> This is impossible with a one-to-one mapping between targets and
> LUNs. The actual bus-level pass-through will be just on the SCSI
> layer, ie 'REPORT LUNS' should be possible. If and how we do a LUN
> remapping internally on the host is a totally different matter.
> Same goes for the transport details; I doubt we will expose all the
> dingy details of the various transports, but rather restrict
> ourselves to an abstract transport.

If we want to support traditional NPIV that's what we have to do.
I still hope we'll see broad SR-IOV support for FC adapters soon,
which would ease all this greatly.

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