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Commit 46a7263d authored by Tony Krowiak's avatar Tony Krowiak Committed by Christian Borntraeger
Browse files

s390: vfio-ap: zeroize the AP queues 



Let's call PAPQ(ZAPQ) to zeroize a queue for each queue configured
for a mediated matrix device when it is released.

Zeroizing a queue resets the queue, clears all pending
messages for the queue entries and disables adapter interruptions
associated with the queue.

Signed-off-by: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: default avatarHalil Pasic <pasic@linux.ibm.com>
Tested-by: default avatarMichael Mueller <mimu@linux.ibm.com>
Tested-by: default avatarFarhan Ali <alifm@linux.ibm.com>
Reviewed-by: default avatarCornelia Huck <cohuck@redhat.com>
Message-Id: <20180925231641.4954-14-akrowiak@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent e06670c5

drivers/s390/crypto/vfio_ap_ops.c

+49 −0
Original line number Diff line number Diff line
@@ -819,6 +819,54 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb, 
	return NOTIFY_OK;

}



static int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,

				    unsigned int retry)

{

	struct ap_queue_status status;



	do {

		status = ap_zapq(AP_MKQID(apid, apqi));

		switch (status.response_code) {

		case AP_RESPONSE_NORMAL:

			return 0;

		case AP_RESPONSE_RESET_IN_PROGRESS:

		case AP_RESPONSE_BUSY:

			msleep(20);

			break;

		default:

			/* things are really broken, give up */

			return -EIO;

		}

	} while (retry--);



	return -EBUSY;

}



static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)

{

	int ret;

	int rc = 0;

	unsigned long apid, apqi;

	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);



	for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,

			     matrix_mdev->matrix.apm_max + 1) {

		for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,

				     matrix_mdev->matrix.aqm_max + 1) {

			ret = vfio_ap_mdev_reset_queue(apid, apqi, 1);

			/*

			 * Regardless whether a queue turns out to be busy, or

			 * is not operational, we need to continue resetting

			 * the remaining queues.

			 */

			if (ret)

				rc = ret;

		}

	}



	return rc;

}



static int vfio_ap_mdev_open(struct mdev_device *mdev)

{

	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
@@ -849,6 +897,7 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev) 
	if (matrix_mdev->kvm)

		kvm_arch_crypto_clear_masks(matrix_mdev->kvm);



	vfio_ap_mdev_reset_queues(mdev);

	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,

				 &matrix_mdev->group_notifier);

	matrix_mdev->kvm = NULL;