Re: [RFC 0/2] target: userspace pass-through backend
From: Stefan Hajnoczi
Date: Mon Jul 14 2014 - 11:08:42 EST
On Tue, Jul 1, 2014 at 9:11 PM, Andy Grover <agrover@xxxxxxxxxx> wrote:
> Shaohua Li wrote an initial implementation of this, late last year.
> 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
>  http://thread.gmane.org/gmane.linux.scsi.target.devel/5044
> 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
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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