linux-kernel - [RFC PATCH v3 0/2] Eventfd signal on guest AP configuration change

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Message-ID: <20250226180605.15810-1-rreyes@linux.ibm.com>
Date: Wed, 26 Feb 2025 13:06:03 -0500
From: Rorie Reyes <rreyes@...ux.ibm.com>
To: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc: hca@...ux.ibm.com, borntraeger@...ibm.com, agordeev@...ux.ibm.com,
        gor@...ux.ibm.com, pasic@...ux.ibm.com, jjherne@...ux.ibm.com,
        alex.williamson@...hat.com, akrowiak@...ux.ibm.com,
        rreyes@...ux.ibm.com
Subject: [RFC PATCH v3 0/2] Eventfd signal on guest AP configuration change

Changelog:

v2:
- Fixing remove notification for AP configuration

v3:
- rebased the first commit b26ed71f9647 ("s390/vfio-ap: Signal eventfd when
guest AP configuration is changed") since I moved 
signal_guest_ap_cfg_changed(matrix_mdev); to function vfio_ap_mdev_request
- Fixed commit message to give details regarding my changes for commit
76cd7c4edebf ("s390/vfio-ap: Adding mdev remove notification")

--------------------------------------------------------------------------

The purpose of this patch is to provide immediate notification of changes
made to a guest's AP configuration by the vfio_ap driver. This will enable
the guest to take immediate action rather than relying on polling or some
other inefficient mechanism to detect changes to its AP configuration.

Note that there are corresponding QEMU patches that will be shipped along
with this patch (see vfio-ap: Report vfio-ap configuration changes) that
will pick up the eventfd signal.

Rorie Reyes (2):
  s390/vfio-ap: Signal eventfd when guest AP configuration is changed
  s390/vfio-ap: Adding mdev remove notification

 drivers/s390/crypto/vfio_ap_ops.c     | 65 ++++++++++++++++++++++++++-
 drivers/s390/crypto/vfio_ap_private.h |  2 +
 include/uapi/linux/vfio.h             |  1 +
 3 files changed, 67 insertions(+), 1 deletion(-)

-- 
2.48.1