linux-kernel - [PATCH v3 0/6] s390/vfio-ap: reset queues removed from guest's AP configuration

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Message-ID: <20240111143846.8801-1-akrowiak@linux.ibm.com>
Date: Thu, 11 Jan 2024 09:38:34 -0500
From: Tony Krowiak <akrowiak@...ux.ibm.com>
To: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc: jjherne@...ux.ibm.com, borntraeger@...ibm.com, pasic@...ux.ibm.com,
        pbonzini@...hat.com, frankja@...ux.ibm.com, imbrenda@...ux.ibm.com,
        alex.williamson@...hat.com, kwankhede@...dia.com
Subject: [PATCH v3 0/6] s390/vfio-ap: reset queues removed from guest's AP configuration

All queues removed from a guest's AP configuration must be reset so when
they are subsequently made available again to a guest, they re-appear in a
reset state. There are some scenarios where this is not the case. For 
example, if a queue device that is passed through to a guest is unbound 
from the vfio_ap device driver, the adapter to which the queue is attached
will be removed from the guest's AP configuration. Doing so implicitly
removes all queues associated with that adapter because the AP architecture
precludes removing a single queue. Those queues also need to be reset.

This patch series ensures that all queues removed from a guest's AP
configuration are reset for all possible scenarios.

Changelog v1=> v2:
-----------------
* Added r-b's to patch 6/6 for Jason and Halil

Tony Krowiak (6):
  s390/vfio-ap: always filter entire AP matrix
  s390/vfio-ap: loop over the shadow APCB when filtering guest's AP
    configuration
  s390/vfio-ap: let 'on_scan_complete' callback filter matrix and update
    guest's APCB
  s390/vfio-ap: reset queues filtered from the guest's AP config
  s390/vfio-ap: reset queues associated with adapter for queue unbound
    from driver
  s390/vfio-ap: do not reset queue removed from host config

 drivers/s390/crypto/vfio_ap_ops.c     | 268 +++++++++++++++++---------
 drivers/s390/crypto/vfio_ap_private.h |  11 +-
 2 files changed, 184 insertions(+), 95 deletions(-)

-- 
2.43.0