[PATCH v4 0/9] s390/vfio_ccw fixes

[Eric Farman <farman@linux.ibm.com>]

This series addresses some pre-existing issues found in the
s390 vfio_ccw (DASD passthrough) driver.

v1: https://lore.kernel.org/r/20260714232208.1683788-1-farman@linux.ibm.com/
v2: https://lore.kernel.org/r/20260720201931.976660-1-farman@linux.ibm.com/
v3: https://lore.kernel.org/r/20260723174751.1180334-1-farman@linux.ibm.com/
v3->v4:
 - [MR] Added r-b where provided (thank you!)
 - [MR] Make ccwchain_count unsigned
 - [MR] Reworked loop in ccwchain_calc_length()
 - [MR] Add boundary check before nospec clamp in async, crw, and schib regions
 - [MR] Add lockdep assertions where appropriate
 - [EF/MR] Add definitions of new fields in channel_program and vfio_ccw_private
 - [sashiko/MR] Fix calculation of DMA address between Format-1 and Format-2 IDA
 - [NEW][sashiko/EF] Defer cp_free() from fsm_notoper(), so it can be called
   while holding sch->lock, without needing to dance with private->cp_mutex

Eric Farman (9):
  s390/vfio_ccw: free all memory if cp_init() fails
  s390/vfio_ccw: limit the number of channel program segments
  s390/vfio_ccw: fix out of bounds check on CCW array
  s390/vfio_ccw: ensure first IDAW remains constant
  s390/vfio_ccw: calculate idal length based on idaw type
  s390/vfio_ccw: ensure index for read/write regions are within range
  s390/vfio_ccw: move cp cleanup out of not operational
  s390/vfio_ccw: implement a channel program mutex
  s390/vfio_ccw: implement a crw lock

 drivers/s390/cio/vfio_ccw_async.c   | 16 +++++
 drivers/s390/cio/vfio_ccw_chp.c     | 30 +++++++--
 drivers/s390/cio/vfio_ccw_cp.c      | 96 ++++++++++++++++++++++-------
 drivers/s390/cio/vfio_ccw_cp.h      | 10 +++
 drivers/s390/cio/vfio_ccw_drv.c     | 19 ++++++
 drivers/s390/cio/vfio_ccw_fsm.c     | 23 ++++---
 drivers/s390/cio/vfio_ccw_ops.c     | 21 +++++--
 drivers/s390/cio/vfio_ccw_private.h | 10 +++
 8 files changed, 184 insertions(+), 41 deletions(-)

-- 
2.53.0