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s390: vfio-ap: zeroize the AP queues

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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: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Tested-by: Michael Mueller <mimu@linux.ibm.com>
Tested-by: Farhan Ali <alifm@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20180925231641.4954-14-akrowiak@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Tony Krowiak 2018-09-25 19:16:28 -04:00 committed by Christian Borntraeger
parent e06670c5fe
commit 46a7263d47
1 changed files with 49 additions and 0 deletions
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49
drivers/s390/crypto/vfio_ap_ops.c
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@ -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;