[PATCH V6 0/5] Add XEN pvSCSI support

[Juergen Gross]

This series adds XEN pvSCSI support. With pvSCSI it is possible to use physical
SCSI devices from a XEN domain.

The support consists of a backend in the privileged Domain-0 doing the real
I/O and a frontend in the unprivileged domU passing I/O-requests to the backend.

The code is taken (and adapted) from the original pvSCSI implementation done
for Linux 2.6 in 2008 by Fujitsu.

Changes in V6:
- changes in scsifront module after comments from Konrad Wilk
- remove double kfree in scsiback
- comments in vscsiif.h adapted after comments from Jan Beulich and
David Vrabel in xen-devel
- added linux-***@vger.kernel.org to MAINTANERS entry

Changes in V5:
- Added patch to support threaded irqs for interdomain event channels
- several changes in xen-scsifront after comments from Christoph Hellwig
- several changes in xen-scsiback after comments from Christoph Hellwig
- several changes in xen-scsiback after comments from James Bottomley
- several changes in xen-scsiback after comments from Nicholas Bellinger

Changes in V4:
- Re-add define for VSCSIIF_ACT_SCSI_SG_PRESET to vscsiif.h to indicate this
action value should not be used in future enhancements

Changes in V3:
- added some comments to the protocol header file
- removed the CDB emulation from xen-scsiback, handled by core target
infrastructure
- several changes in xen-scsifront after comments from Christoph Hellwig

Changes in V2:
- use core target infrastructure by backend instead of pure SCSI passthrough
- add support for larger SG lists by putting them in grant page(s)
- add command abort capability


Juergen Gross (5):
xen/events: support threaded irqs for interdomain event channels
Add XEN pvSCSI protocol description
Introduce xen-scsifront module
Introduce XEN scsiback module
add xen pvscsi maintainer

MAINTAINERS | 9 +
drivers/scsi/Kconfig | 9 +
drivers/scsi/Makefile | 1 +
drivers/scsi/xen-scsifront.c | 1024 +++++++++++++++++
drivers/xen/Kconfig | 9 +
drivers/xen/Makefile | 1 +
drivers/xen/events/events_base.c | 5 +-
drivers/xen/xen-scsiback.c | 2124 ++++++++++++++++++++++++++++++++++++
include/xen/events.h | 2 +
include/xen/interface/io/vscsiif.h | 229 ++++
10 files changed, 3411 insertions(+), 2 deletions(-)
create mode 100644 drivers/scsi/xen-scsifront.c
create mode 100644 drivers/xen/xen-scsiback.c
create mode 100644 include/xen/interface/io/vscsiif.h