From: Christoph Hellwig <hch@lst.de>
To: Paul Brook <paul@codesourcery.com>
Cc: kvm@vger.kernel.org, Rusty Russell <rusty@rustcorp.com.au>,
qemu-devel@nongnu.org,
Christian Borntraeger <borntraeger@de.ibm.com>,
Hannes Reinecke <hare@suse.de>, Christoph Hellwig <hch@lst.de>
Subject: Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support
Date: Fri, 1 May 2009 09:24:49 +0200 [thread overview]
Message-ID: <20090501072449.GA21867@lst.de> (raw)
In-Reply-To: <200904302249.20940.paul@codesourcery.com>
On Thu, Apr 30, 2009 at 10:49:19PM +0100, Paul Brook wrote:
> Only if you emulate a crufty old parallel scsi bus, and that's just silly.
> One of the nice things about scsi is it separates the command set from the
> transport layer. cf. USB mass-storage, SAS, SBP2(firewire), and probably
> several others I've forgotten.
It has nothing to do with an SPI bus. Everything that resembles a SAM
architecture can have multiple LUs per targer, and multiple targers per
initiator port, so we need all the complex queing code, and we need
error handling and and and. For some really simple ones like USB
mass-storage we might get away with some ad-hoc SCSI CDB generation
instead of real scsi stack, but I would recommend against it.
next prev parent reply other threads:[~2009-05-01 7:25 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090427082606.GA32604@lst.de>
2009-04-27 8:29 ` [Qemu-devel] [PATCH] virtio-blk: add SGI_IO passthru support Christoph Hellwig
2009-04-27 9:15 ` Avi Kivity
2009-04-28 9:47 ` Christoph Hellwig
2009-04-27 14:36 ` [Qemu-devel] " Anthony Liguori
2009-04-28 9:51 ` Christoph Hellwig
2009-04-28 16:37 ` Anthony Liguori
2009-04-28 16:52 ` Christian Borntraeger
2009-04-29 10:48 ` Christoph Hellwig
2009-04-29 11:11 ` Paul Brook
2009-04-29 11:19 ` Christian Borntraeger
2009-04-29 11:29 ` Paul Brook
2009-04-29 11:21 ` Christoph Hellwig
2009-04-29 11:37 ` Paul Brook
2009-04-30 20:13 ` Christoph Hellwig
2009-04-30 20:55 ` Nicholas A. Bellinger
2009-04-30 21:49 ` Paul Brook
2009-04-30 21:56 ` Javier Guerra
2009-05-01 7:24 ` Christoph Hellwig [this message]
2009-05-01 11:08 ` Jamie Lokier
2009-05-01 14:28 ` Christoph Hellwig
2009-05-05 5:21 ` Rusty Russell
2009-04-28 19:09 ` Christian Borntraeger
2009-04-29 10:50 ` Christoph Hellwig
2009-04-29 11:07 ` Christian Borntraeger
2009-04-28 9:57 ` [Qemu-devel] [PATCH 2/2] virtio-blk: add SG_IO " Christoph Hellwig
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