From: Tony Krowiak <akrowiak@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx> Reviewed-by: Halil Pasic <pasic@xxxxxxxxxxxxx> Tested-by: Michael Mueller <mimu@xxxxxxxxxxxxx> Tested-by: Farhan Ali <alifm@xxxxxxxxxxxxx> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> --- drivers/s390/crypto/vfio_ap_ops.c | 29 ++++++++++++++++++++++++++++- drivers/s390/crypto/vfio_ap_private.h | 25 +++++++++++++++++++++++++ 2 files changed, 53 insertions(+), 1 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 31e0dbe..e5c6dc1 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -761,6 +761,30 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb, return NOTIFY_OK; } +static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev, bool force) +{ + 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_reset_queue(apid, apqi, 1); + if (ret) { + if (force) + rc = ret; + else + return ret; + } + } + } + + return rc; +} + static int vfio_ap_mdev_open(struct mdev_device *mdev) { struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); @@ -788,7 +812,10 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev) { struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); - kvm_arch_crypto_clear_masks(matrix_mdev->kvm); + if (matrix_mdev->kvm) + kvm_arch_crypto_clear_masks(matrix_mdev->kvm); + + vfio_ap_mdev_reset_queues(mdev, true); vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &matrix_mdev->group_notifier); matrix_mdev->kvm = NULL; diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h index 6fa77cf..087e21a 100644 --- a/drivers/s390/crypto/vfio_ap_private.h +++ b/drivers/s390/crypto/vfio_ap_private.h @@ -78,4 +78,29 @@ struct ap_matrix_mdev { extern int vfio_ap_mdev_register(void); extern void vfio_ap_mdev_unregister(void); +static inline int vfio_ap_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: + pr_warn("%s: error zeroizing %02x.%04x: response code %d\n", + VFIO_AP_MODULE_NAME, apid, apqi, + status.response_code); + return -EIO; + } + } while (retry--); + + return -EBUSY; +} + #endif /* _VFIO_AP_PRIVATE_H_ */ -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html