linux-kernel - Re: [PATCH] Add virtio-scsi to the virtio spec

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Message-ID: <87ty5jre1r.fsf@rustcorp.com.au>
Date:	Fri, 02 Dec 2011 11:21:44 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	virtualization <virtualization@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH] Add virtio-scsi to the virtio spec

On Thu, 01 Dec 2011 09:55:30 +0100, Paolo Bonzini <pbonzini@...hat.com> wrote:
> On 12/01/2011 04:14 AM, Rusty Russell wrote:
> > I'd prefer to see the spec only cover things
> > which are implemented and tested, otherwise the risk of a flaw in the
> > spec is really high in my experience.
> 
> In general I agree, and I did that for virtio-specific things such as 
> the eventq and the configuration space.  This is also why I don't want 
> to add untested controlq requests that people suggested.
> 
> However, there's tension between this and providing a complete SCSI 
> transport.  SCSI is roughly defined as a set of RPC interfaces ("Send 
> command", "Abort task", etc.) and transports provide the RPC protocol. 
> The SCSI command set changes relatively often, but the RPC interfaces 
> are pretty stable.  This stability limits the risk, and having a mapping 
> for all interfaces also makes future changes less likely.

OK, I expect that someone reading the spec will be SCSI-familiar more
than virtio-familiar, so it's more important that they be comfortable,
than that I be comfortable.

Thanks!
Rusty.
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