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

Jason J. Herne
2024-03-26T16:47:12Z

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(-)

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2.41.0