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Date: Tue, 28 Apr 2009 11:37:01 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support
References: <20090427082606.GA32604@lst.de> <20090427082914.GA383@lst.de>
	<49F5C303.3060003@codemonkey.ws> <20090428095154.GB4137@lst.de>
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To: Christoph Hellwig <hch@lst.de>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>, Rusty Russell <rusty@rustcorp.com.au>, qemu-devel@nongnu.org, kvm@vger.kernel.org, Hannes Reinecke <hare@suse.de>

Christoph Hellwig wrote:
>> Should we be 
>> handling some SCSI cmds internally to QEMU (like eject operations) and 
>> supporting media=cdrom in -drive for if=virtio?
>>     
>
> Not quite yet.  Eventually I want to support a virtio-scsi kind of
> transport which would use the same virtio-blk protocol but only send
> scsi commands.  We'd need a different driver on the Linux side for
> it that registers to the scsi layer.  On the QEMU side it could either
> do pass-through to a real scsi device using SG_IO or use the existing
> command scsi emulator in scsi-disk.c.
>   

Ah, excellent.  I think that's a great thing to do.  So do you think 
virtio-scsi would deprecate virtio-blk?

I've gotten a number of requests for exposing stuff like VPD through 
virtio-blk.  There's also a surprising amount of software out there that 
assumes /dev/sdX or /dev/hdX naming.

Regards,

Anthony Liguori