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Date:	Mon, 14 Jul 2014 17:08:30 +0200
From:	Stefan Hajnoczi <>
To:	Andy Grover <>
Cc:	target-devel <>,
	linux-scsi <>,
	Christoph Hellwig <>,
	"Nicholas A. Bellinger" <>,,
	linux-kernel <>
Subject: Re: [RFC 0/2] target: userspace pass-through backend

On Tue, Jul 1, 2014 at 9:11 PM, Andy Grover <> wrote:
> Shaohua Li wrote an initial implementation of this, late last year[1].
> Starting from that, I started working on some alternate implementation
> choices, and ended up with something rather different.
> Please take a look and let me know what you think. Patch 1 is a
> design and overview doc, and patch 2 is the actual code, along with
> implementation rationale.
> Thanks -- Andy
> [1]
> Andy Grover (2):
>   target: Add documentation on the target userspace pass-through driver
>   target: Add a user-passthrough backstore
>  Documentation/target/tcmu-design.txt   |  210 +++++++
>  drivers/target/Kconfig                 |    5 +
>  drivers/target/Makefile                |    1 +
>  drivers/target/target_core_transport.c |    4 +
>  drivers/target/target_core_user.c      | 1078 ++++++++++++++++++++++++++++++++
>  drivers/target/target_core_user.h      |  126 ++++
>  6 files changed, 1424 insertions(+)
>  create mode 100644 Documentation/target/tcmu-design.txt
>  create mode 100644 drivers/target/target_core_user.c
>  create mode 100644 drivers/target/target_core_user.h

Hi Andy,
Just wanted to let you know that a userspace backstore would
potentially be useful for QEMU.  QEMU supports a number of disk image
formats (VMDK, VHDX, qcow2, and more).  Make these available as SCSI
LUNs on the host or to remote SCSI initiators is cool.

We currently have a tool called qemu-nbd that exports disk images
using the Network Block Device protocol.  Your userspace backstore
provides other options like iSCSI target or loopback access on the

I took a quick look at the patch and imagine it's not hard to hook up
to QEMU.  Looks promising!

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