linux-kernel - [PATCH 0/3] s390/vfio-ap: refactor mdev remove callback and locks

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Date:   Wed,  9 Jun 2021 18:46:31 -0400
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     borntraeger@...ibm.com, cohuck@...hat.com,
        pasic@...ux.vnet.ibm.com, jjherne@...ux.ibm.com, jgg@...dia.com,
        alex.williamson@...hat.com, kwankhede@...dia.com,
        frankja@...ux.ibm.com, david@...hat.com, imbrenda@...ux.ibm.com,
        hca@...ux.ibm.com
Subject: [PATCH 0/3] s390/vfio-ap: refactor mdev remove callback and locks

This series is an expansion of a previous patch series entitled 
's390/vfio-ap: fix memory leak in mdev remove callback'. It has been
renamed because there never really was a memory leak to fix. In addition,
reviews of the previous series gave rise to additional changes to the
locking mechanisms used to control access to various data elements managed
by the vfio_ap device driver.

This patch series:

1. Refactors the mdev remove callback to always clean up mdev resources
2. Adds two semaphores to replace wait queue during KVM pointer set/unset
3. Adds a semaphore to control r/w access to PQAP instruction interception
   handler.

Tony Krowiak (3):
  s390/vfio-ap: clean up mdev resources when remove callback invoked
  s390/vfio-ap: introduce two new r/w locks to replace wait_queue_head_t
  s390/vfio-ap: r/w lock for PQAP interception handler function pointer

 arch/s390/include/asm/kvm_host.h      |   6 +-
 arch/s390/kvm/kvm-s390.c              |   1 +
 arch/s390/kvm/priv.c                  |   6 +-
 drivers/s390/crypto/vfio_ap_ops.c     | 374 ++++++++++----------------
 drivers/s390/crypto/vfio_ap_private.h |  10 +-
 5 files changed, 163 insertions(+), 234 deletions(-)

-- 
2.30.2