linux-kernel - Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

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Message-ID: <OF36197712.1A42EB9E-ONC125799E.0049E3C2-C125799E.004AD4BF@de.ibm.com>
Date:	Wed, 8 Feb 2012 14:37:16 +0100
From:	Christian Hoff <christian.hoff@...ibm.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	BORNTRAE@...ux.vnet.ibm.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	mst@...hat.com, rusty@...tcorp.com.au
Subject: Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

Paolo Bonzini wrote:
> Christian Hoff wrote:
> > Instead the format has some disadvantages:
> > - It uses up 8 bytes where 3 bytes would be sufficient in order to 
store
> > both the target ID and LUN number information
> > - The format limits us to 255 target IDs. I agree that the LUN limit 
is
> > probably more a theoretical and not a practical one, but 255 target 
IDs
> > could become a limitation in the future.
>
> It also provides better upwards-compatibility in case the limitations 
> are actually hit.  If I had used "uint8_t target; uint16_t lun;" an 
> extension would require a feature bit and a new struct.  With 8-bytes, 
> you can just expand the definition.  That pretty much sums it up.

Ok, fair enough. This addresses my question.

Again, I have already done much testing with virtio-scsi and can confirm 
that the code is working flawlessly. In my opinion, virtio-scsi is a 
worthwhile addition to virtio-block and should be considered for inclusion 
into mainline kernel code.

Mit freundlichen Grüßen / Kind regards

Christian Hoff

Student - Applied Computer Science


Phone:
49-16098976-950
 IBM Deutschland

E-Mail:
christian.hoff@...ibm.com
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 71083 Herrenberg


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