path: root/drivers/s390/crypto/vfio_ap_ops.c
diff options
authorTony Krowiak <>2021-06-09 18:46:32 -0400
committerVasily Gorbik <>2021-06-21 11:19:18 +0200
commit8c0795d2a0f50e2b131f5b2a8c2795939a94058e (patch)
tree46dec4cc07c8753010cea30a6c83b94564b2134e /drivers/s390/crypto/vfio_ap_ops.c
parentca1f4d702d534387aa1f16379edb3b03cdb6ceda (diff)
s390/vfio-ap: clean up mdev resources when remove callback invoked
The mdev remove callback for the vfio_ap device driver bails out with -EBUSY if the mdev is in use by a KVM guest (i.e., the KVM pointer in the struct ap_matrix_mdev is not NULL). The intended purpose was to prevent the mdev from being removed while in use. There are two problems with this scenario: 1. Returning a non-zero return code from the remove callback does not prevent the removal of the mdev. 2. The KVM pointer in the struct ap_matrix_mdev will always be NULL because the remove callback will not get invoked until the mdev fd is closed. When the mdev fd is closed, the mdev release callback is invoked and clears the KVM pointer from the struct ap_matrix_mdev. Let's go ahead and remove the check for KVM in the remove callback and allow the cleanup of mdev resources to proceed. Signed-off-by: Tony Krowiak <> Reviewed-by: Jason Gunthorpe <> Link: Signed-off-by: Vasily Gorbik <>
Diffstat (limited to 'drivers/s390/crypto/vfio_ap_ops.c')
1 files changed, 0 insertions, 10 deletions
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index b2c7e10dfdcd..122c85c22469 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -366,16 +366,6 @@ static int vfio_ap_mdev_remove(struct mdev_device *mdev)
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- /*
- * If the KVM pointer is in flux or the guest is running, disallow
- * un-assignment of control domain.
- */
- if (matrix_mdev->kvm_busy || matrix_mdev->kvm) {
- mutex_unlock(&matrix_dev->lock);
- return -EBUSY;
- }