linux-kernel - Re: [PATCH] SCSI driver for VMware's virtual HBA.

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Date:	Tue, 1 Sep 2009 10:16:51 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Bart Van Assche <bvanassche@....org>,
	James Bottomley <James.Bottomley@...e.de>, akataria@...are.com,
	Robert Love <robert.w.love@...el.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Mike Christie <michaelc@...wisc.edu>,
	linux-scsi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Torokhov <dtor@...are.com>,
	Rolf Eike Beer <eike-kernel@...tec.de>,
	Maxime Austruy <maustruy@...are.com>
Subject: Re: [PATCH] SCSI driver for VMware's virtual HBA.

On Tue, Sep 01, 2009 at 09:12:43AM -0700, Roland Dreier wrote:
> I'm not really sure we should be trying to force drivers to share just
> because they are paravirtualized -- if there is real commonality, then
> sure put it in common code, but different hypervisors are probably as
> different as different hardware.

I really disagree.  This kind of virtualised drivers are pretty much
communication protocols, and not hardware.  As such, why design a new one?
If there's an infelicity in the ibmvscsi protocol, it makes sense to
design a new one.  But being different for the sake of being different
is just a way to generate a huge amount of make-work.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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