[PATCH v4 0/4] s390/vfio-ap: Fix pre-existing bugs in vfio_ap device driver

[Anthony Krowiak <akrowiak@linux.ibm.com>]

The sashiko AI reported several pre-existing bugs in the vfio_ap device
driver code while reviewing unrelated patches. This series fixes four
such bugs.

Change log v3 => v4:
~~~~~~~~~~~~~~~~~~~
Patch 1/4: Fix leak of pinned NIB and registered NISC in
           vfio_ap_irq_enable/disable()
* Overrode the response status in vfio_irq_disable() for the
  AP_RESPONSE_NORMAL case when vfio_ap_wait_for_irqclear() returns false.
* Changed name of vfio_ap_wait_for_irqclear() to
  vfio_ap_wait_for_irq_state() and added a parameter to specify
  the value (0 = disabled, 1 = enabled) to which the status.irq_enabled
  (I-bit) is to be compared.
* Added a call to vfio_ap_wait_for_irq_state() to vfio_ap_irq_enable()
  to verify that the I-bit is set when AP_RESPONSE_NORMAL is returned
  from the AQIC call before proceeding.

Patch 3/4: Fix unbounded loop in apq_reset_check()
* Check return code from apq_status_check() called from apq_reset_check().
  If it returns 0 when the AP_RESET_MAX_WAIT timeout is detected, then
  clean up AQIC resources.

Anthony Krowiak (4):
  s390/vfio-ap: Fix leak of pinned NIB and registered NISC in
    vfio_ap_irq_enable/disable()
  s390/vfio-ap: Fix failure to release IRQ notification eventfd contexts
  s390/vfio-ap: Fix unbounded loop in apq_reset_check()
  s390/vfio-ap: Use AP_DOMAINS for adm_add bitmap size in
    vfio_ap_mdev_cfg_add()

 drivers/s390/crypto/vfio_ap_ops.c | 216 +++++++++++++++++++++++++-----
 1 file changed, 186 insertions(+), 30 deletions(-)

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2.53.0