linux-kernel - [PATCH v4 0/5] s390/vfio-ap: ap_config sysfs attribute for mdevctl automation

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Date: Tue, 26 Mar 2024 12:47:01 -0400
From: "Jason J. Herne" <jjherne@...ux.ibm.com>
To: linux-s390@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, pasic@...ux.ibm.com, akrowiak@...ux.ibm.com,
        borntraeger@...ibm.com, agordeev@...ux.ibm.com, gor@...ux.ibm.com,
        hca@...ux.ibm.com
Subject: [PATCH v4 0/5] s390/vfio-ap: ap_config sysfs attribute for mdevctl automation

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
==========
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     | 223 ++++++++++++++++++++++++--
 drivers/s390/crypto/vfio_ap_private.h |   6 +-
 5 files changed, 265 insertions(+), 29 deletions(-)

-- 
2.41.0