Mdevctl requires a way to atomically query and atomically update a vfio-ap
mdev's current state. This patch set creates the ap_config sysfs attribute.
This new attribute allows reading and writing an mdev's entire state in one go.
If a newly written state is invalid for any reason the entire state is rejected
and the target mdev remains unchanged.

Changelog
==========
v5
  - Replaced 'volatile' Wstringop-overread-warning workaround with a much
    nicer !null check in ap_matrix_copy
  - Fixed spacing & double assignment issues reported by checkpatch.pl --strict
v4
  - Added volatile cast to fixup false positive gcc warning: 
    Wstringop-overread-warning
  - Added new Reviewed-By tags
v3
  - Optimization: hot unplug functions skip apcb update if nothing was actually
    unplugged.
  - Hot unplug functions modified to zero bitmaps before use.
  - Rename ap_matrix_length_check to ap_matrix_overflow_check
  - Fixed omissions and errors in several commit messages and the docs.
  - Added Tested-by tags.
v2
  - Rebased patched on top of latest master
  - Reworked code to fit changes introduced by f848cba767e59
      s390/vfio-ap: reset queues filtered from the guest's AP config
  - Moved docs changes to separate patch

Jason J. Herne (5):
  s390/ap: Externalize AP bus specific bitmap reading function
  s390/vfio-ap: Add sysfs attr, ap_config, to export mdev state
  s390/vfio-ap: Ignore duplicate link requests in
    vfio_ap_mdev_link_queue
  s390/vfio-ap: Add write support to sysfs attr ap_config
  docs: Update s390 vfio-ap doc for ap_config sysfs attribute

 Documentation/arch/s390/vfio-ap.rst   |  30 ++++
 drivers/s390/crypto/ap_bus.c          |  13 +-
 drivers/s390/crypto/ap_bus.h          |  22 +++
 drivers/s390/crypto/vfio_ap_ops.c     | 224 ++++++++++++++++++++++++--
 drivers/s390/crypto/vfio_ap_private.h |   6 +-
 5 files changed, 266 insertions(+), 29 deletions(-)

-- 
2.41.0

On Mon, Apr 15, 2024 at 11:25:50AM -0400, Jason J. Herne wrote:
Hi Jason,
>  Documentation/arch/s390/vfio-ap.rst   |  30 ++++
>  drivers/s390/crypto/ap_bus.c          |  13 +-
>  drivers/s390/crypto/ap_bus.h          |  22 +++
>  drivers/s390/crypto/vfio_ap_ops.c     | 224 ++++++++++++++++++++++++--
>  drivers/s390/crypto/vfio_ap_private.h |   6 +-
>  5 files changed, 266 insertions(+), 29 deletions(-)

Applied, thanks!