[RFC PATCH v2 2/2] s390/vfio-ap: Fixing mdev remove notification

Rorie Reyes
2025-02-25T20:12:16Z

Removed eventfd from vfio_ap_mdev_unset_kvm
Update and release locks along with the eventfd added
to vfio_ap_mdev_request

Signed-off-by: Rorie Reyes <rreyes@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index c6ff4ab13f16..e0237ea27d7e 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1870,7 +1870,6 @@ static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev)
get_update_locks_for_kvm(kvm);

kvm_arch_crypto_clear_masks(kvm);
- signal_guest_ap_cfg_changed(matrix_mdev);
vfio_ap_mdev_reset_queues(matrix_mdev);
kvm_put_kvm(kvm);
matrix_mdev->kvm = NULL;
@@ -2057,6 +2056,14 @@ static void vfio_ap_mdev_request(struct vfio_device *vdev, unsigned int count)

matrix_mdev = container_of(vdev, struct ap_matrix_mdev, vdev);

+ if (matrix_mdev->kvm) {
+ get_update_locks_for_kvm(matrix_mdev->kvm);
+ kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
+ signal_guest_ap_cfg_changed(matrix_mdev);
+ } else {
+ mutex_lock(&matrix_dev->mdevs_lock);
+ }
+
if (matrix_mdev->req_trigger) {
if (!(count % 10))
dev_notice_ratelimited(dev,
@@ -2068,6 +2075,12 @@ static void vfio_ap_mdev_request(struct vfio_device *vdev, unsigned int count)
dev_notice(dev,
"No device request registered, blocked until released by user\n");
}
+
+ if (matrix_mdev->kvm)
+ release_update_locks_for_kvm(matrix_mdev->kvm);
+ else
+ mutex_unlock(&matrix_dev->mdevs_lock);
+
}

static int vfio_ap_mdev_get_device_info(unsigned long arg)
--
2.39.5 (Apple Git-154)