@@ -652,8 +652,8 @@ static void vfio_ap_matrix_init(struct ap_config_info *info,
static void signal_guest_ap_cfg_changed(struct ap_matrix_mdev *matrix_mdev)
{
- if (matrix_mdev->cfg_chg_trigger)
- eventfd_signal(matrix_mdev->cfg_chg_trigger);
+ if (matrix_mdev->cfg_chg_trigger)
+ eventfd_signal(matrix_mdev->cfg_chg_trigger);
}
static void vfio_ap_mdev_update_guest_apcb(struct ap_matrix_mdev *matrix_mdev)
@@ -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)
This patch is based on the s390/features branch The guest's AP configuration is cleared when the mdev is removed, so userspace must be notified that the AP configuration has changed. To this end, this patch: * Removes call to 'signal_guest_ap_cfg_changed()' function from the 'vfio_ap_mdev_unset_kvm()' function because it has no affect given it is called after the mdev fd is closed. * Adds call to 'signal_guest_ap_cfg_changed()' function to the 'vfio_ap_mdev_request()' function to notify userspace that the guest's AP configuration has changed before signaling the request to remove the mdev. Minor change - Fixed an indentation issue in function 'signal_guest_ap_cfg_changed()' Fixes: 2ba4410dd477 ("s390/vfio-ap: Signal eventfd when guest AP configuration is changed") Signed-off-by: Rorie Reyes <rreyes@linux.ibm.com> --- drivers/s390/crypto/vfio_ap_ops.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-)