linux-kernel - [PATCH v12 02/17] s390/vfio-ap: decrement reference count to KVM

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Date:   Tue, 24 Nov 2020 16:40:01 -0500
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ux.ibm.com, borntraeger@...ibm.com, cohuck@...hat.com,
        mjrosato@...ux.ibm.com, pasic@...ux.ibm.com,
        alex.williamson@...hat.com, kwankhede@...dia.com,
        fiuczy@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        Tony Krowiak <akrowiak@...ux.ibm.com>,
        Tony Krowiak <akrowiak@...y.rr.com>
Subject: [PATCH v12 02/17] s390/vfio-ap: decrement reference count to KVM

Decrement the reference count to KVM when notified that KVM pointer is
invalidated via the vfio group notifier.

Signed-off-by: Tony Krowiak <akrowiak@...y.rr.com>
Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
---
 drivers/s390/crypto/vfio_ap_ops.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 66fd9784a156..31e39c1f6e56 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1095,7 +1095,11 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
 	matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
 
 	if (!data) {
+		if (matrix_mdev->kvm)
+			kvm_put_kvm(matrix_mdev->kvm);
+
 		matrix_mdev->kvm = NULL;
+
 		return NOTIFY_OK;
 	}
 
-- 
2.21.1