[Qemu-devel] Re: [PATCH 0/5]: Add hw/scsi-bsg.c backend driver

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

On Wed, 2010-11-24 at 11:31 +0200, Boaz Harrosh wrote:
> On 11/24/2010 10:44 AM, Nicholas A. Bellinger wrote:
> > From: Nicholas Bellinger <nab@linux-iscsi.org>
> > 
> > <Quick resend with proper subject>
> > 
> > Greetings QEMU SCSI / BLOCK folks,
> > 
> > This series adds rebased support for the hw/scsi-bsg.c backstore for scsi-bus
> > compatible HBA emulation in QEMU-KVM on Linux hosts supporting the BSG driver
> > against current mainline qemu-kvm.git/master code.
> > 
> > This patch is available from the scsi-bsg branch in the megasas/scsi friendly QEMU-KVM tree at:
> > 
> > http://git.kernel.org/?p=virt/kvm/nab/qemu-kvm.git;a=shortlog;h=refs/heads/megasas-upstream-v1
> > 
> > which includes Hannes's recent patch series posted recently against mainline v0.13.0 here:
> > 
> > Re: [Qemu-devel] [PATCH] Megasas HBA emulation and SCSI update v.2
> > http://lists.gnu.org/archive/html/qemu-devel/2010-11/msg02018.html
> > 
> > Note that in order for BSG I/O to function using vectored AIO a kernel patch to
> > linux/block/bsg.c:bsg_map_hdr() is currently required running on a bit paired
> > user/kernel enviroment.  The kernel patch in question is here:
> > 
> > http://marc.info/?l=linux-scsi&m=127649585524598&w=2
> > 
> 
> OK I've looked at this patch. I have sent such a patch my self and Pete Wyckoff
> and other people have sent it as well. I could not find in the URL above any
> response to your patch. Where there any?

Hi Boaz,

I found Tomo-san's follow here:

http://ns3.spinics.net/lists/linux-scsi/msg44266.html

> 
> Thanks
> Boaz
> 
> > The first three patches involve updating block code to support the BSG backstore for scsi-bsg.
> > 
> > The forth patch adds the minor changes to hw/scsi-bus.c and hw/scsi-disk.c in order to
> > function with scsi-bsg.
> > 
> > And the fifth patch adds the main hw/scsi-bsg.c logic necessary to run the new struct
> > SCSIDeviceInfo and for BSG AIO using struct iovec and paio_submit_len() to function.
> > The scsi-bsg.c code has been refactored to follow the modern SCSIDeviceInfo->alloc_req_iov()
> > and incoming struct iovec * memory for underlying SCSIRequest SGLs
> > 
> > So far this has been tested with v2 8708EM2 HBA Emulation on 0.13.0 on a .37-rc2
> > KVM host with TCM_Loop FILEIO backstores into a Debian Lenny v2.6.26 x86_64
> > KVM guest with XFS filesystem mounts.
> > 
> > Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
> > 
> > Nicholas Bellinger (5):
> >   block: Add top level BSG support
> >   block: Add BSG qemu_open() in block/raw.c:raw_open()
> >   block: Add paio_submit_len() non sector sized AIO
> >   scsi: Add BSG checks into scsi-bus and scsi-disk
> >   scsi-bsg: Add initial support for BSG based SCSIDeviceInfo
> > 
> >  Makefile.objs         |    2 +-
> >  block.c               |    7 +-
> >  block.h               |    1 +
> >  block/raw-posix-aio.h |    3 +
> >  block/raw-posix.c     |   65 +++++-
> >  block/raw.c           |   21 ++
> >  block_int.h           |    6 +
> >  hw/scsi-bsg.c         |  720 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  hw/scsi-bus.c         |    3 +-
> >  hw/scsi-disk.c        |    5 +
> >  posix-aio-compat.c    |   29 ++
> >  11 files changed, 855 insertions(+), 7 deletions(-)
> >  create mode 100644 hw/scsi-bsg.c
> > 
>