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Re: [qemu-web PATCH v2] Add virtio-blk and virtio-scsi configuration pos

From: Thomas Huth
Subject: Re: [qemu-web PATCH v2] Add virtio-blk and virtio-scsi configuration post
Date: Thu, 14 Jan 2021 20:57:26 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.3

On 14/01/2021 17.05, Stefan Hajnoczi wrote:
On Wed, Jan 06, 2021 at 03:04:20PM +0100, Thomas Huth wrote:
On 05/01/2021 11.49, Stefan Hajnoczi wrote:
+Applications that send SCSI commands are better served by the virtio-scsi
+device, which has full SCSI support. SCSI passthrough was removed from the
+Linux virtio-blk driver in v5.6 in favor of using virtio-scsi.

Since "passthrough" sounds like a passthrough of real hardware devices, I'd
maybe rather say something like: The original virtio-blk devices also
included the possibility to handle SCSI commands, but this features was
removed from the Linux driver in v5.6 in favor of using virtio-scsi (and is
also not available for modern virtio-1.0 devices anymore).

Guest SCSI commands were passed through to the physical LUN but what you
described sounds more like emulating SCSI commands, which is not what
the feature did.

Ok, I likely just understood that feature in the wrong way. Looking at the virtio spec, it just talks about the possibility to send SCSI commands to the virtio-blk device, but looking at the implementation in QEMU, it seems more like the way you described, so never mind my comment.


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