[PATCH v8 09/16] s390/vfio_ap: add qlink from ap_matrix_mdev struct to vfio_ap_queue struct

Tony Krowiak
2020-06-05T21:40:18Z

In order to make retrieval of a vfio_ap_queue struct more
efficient when we already have a pointer to the ap_matrix_mdev to which the
queue's APQN is assigned, let's go ahead and add a link from the
ap_matrix_mdev struct to the vfio_ap_queue struct.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 102 ++++++++++++++++++--------
drivers/s390/crypto/vfio_ap_private.h | 2 +
2 files changed, 72 insertions(+), 32 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index add442977b9a..9a019b2b86f8 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -50,6 +50,19 @@ static struct vfio_ap_queue *vfio_ap_get_queue(unsigned long apqn)
return q;
}

+struct vfio_ap_queue *vfio_ap_get_mdev_queue(struct ap_matrix_mdev *matrix_mdev,
+ unsigned long apqn)
+{
+ struct vfio_ap_queue *q;
+
+ hash_for_each_possible(matrix_mdev->qtable, q, mdev_qnode, apqn) {
+ if (q && (q->apqn == apqn))
+ return q;
+ }
+
+ return NULL;
+}
+
/**
* vfio_ap_wait_for_irqclear
* @apqn: The AP Queue number
@@ -337,6 +350,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
matrix_mdev->mdev = mdev;
vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
+ hash_init(matrix_mdev->qtable);
mdev_set_drvdata(mdev, matrix_mdev);
matrix_mdev->pqap_hook.hook = handle_pqap;
matrix_mdev->pqap_hook.owner = THIS_MODULE;
@@ -639,7 +653,7 @@ static int vfio_ap_mdev_filter_matrix(struct ap_matrix_mdev *matrix_mdev,
* filter the APQI.
*/
apqn = AP_MKQID(apid, apqi);
- if (!vfio_ap_get_queue(apqn)) {
+ if (!vfio_ap_get_mdev_queue(matrix_mdev, apqn)) {
if (filter_apids)
clear_bit_inv(apid, shadow_apcb->apm);
else
@@ -682,7 +696,6 @@ static bool vfio_ap_mdev_config_shadow_apcb(struct ap_matrix_mdev *matrix_mdev)
vfio_ap_matrix_init(&matrix_dev->info, &shadow_apcb);
napm = bitmap_weight(matrix_mdev->matrix.apm, AP_DEVICES);
naqm = bitmap_weight(matrix_mdev->matrix.aqm, AP_DOMAINS);
-
/*
* If there are no APIDs or no APQIs assigned to the matrix mdev,
* then no APQNs shall be assigned to the guest CRYCB.
@@ -694,6 +707,7 @@ static bool vfio_ap_mdev_config_shadow_apcb(struct ap_matrix_mdev *matrix_mdev)
*/
napm = vfio_ap_mdev_filter_matrix(matrix_mdev, &shadow_apcb,
true);
+
/*
* If there are no APQNs that can be assigned to the guest's
* CRYCB after filtering, then try filtering the APQIs.
@@ -742,56 +756,75 @@ enum qlink_type {
UNLINK_APQI,
};

+static void vfio_ap_mdev_link_queue(struct ap_matrix_mdev *matrix_mdev,
+ unsigned long apid, unsigned long apqi)
+{
+ struct vfio_ap_queue *q;
+
+ q = vfio_ap_get_queue(AP_MKQID(apid, apqi));
+ if (q) {
+ q->matrix_mdev = matrix_mdev;
+ hash_add(matrix_mdev->qtable,
+ &q->mdev_qnode, q->apqn);
+ }
+}
+
+static void vfio_ap_mdev_unlink_queue(unsigned long apid, unsigned long apqi)
+{
+ struct vfio_ap_queue *q;
+
+ q = vfio_ap_get_queue(AP_MKQID(apid, apqi));
+ if (q) {
+ q->matrix_mdev = NULL;
+ hash_del(&q->mdev_qnode);
+ }
+}
+
/**
* vfio_ap_mdev_link_queues
*
* @matrix_mdev: The matrix mdev to link.
- * @type: The type of link.
+ * @type: The type of @qlink_id.
* @qlink_id: The APID or APQI of the queues to link.
*
- * Sets the link from the queues with the specified @qlink_id (i.e., APID or
- * APQI) to @matrix_mdev:
- * qlink_id == LINK_APID: Link @matrix_mdev to the queues with the
- * specified APID>
- * qlink_id == UNLINK_APID: Unlink @matrix_mdev from the queues with the
- * specified APID>
- * qlink_id == LINK_APQI: Link @matrix_mdev to the queues with the
- * specified APQI>
- * qlink_id == UNLINK_APQI: Unlink @matrix_mdev from the queues with the
- * specified APQI>
+ * Sets or clears the links between the queues with the specified @qlink_id
+ * and the @matrix_mdev:
+ * @type == LINK_APID: Set the links between the @matrix_mdev and the
+ * queues with the specified @qlink_id (APID)
+ * @type == LINK_APQI: Set the links between the @matrix_mdev and the
+ * queues with the specified @qlink_id (APQI)
+ * @type == UNLINK_APID: Clear the links between the @matrix_mdev and the
+ * queues with the specified @qlink_id (APID)
+ * @type == UNLINK_APQI: Clear the links between the @matrix_mdev and the
+ * queues with the specified @qlink_id (APQI)
*/
static void vfio_ap_mdev_link_queues(struct ap_matrix_mdev *matrix_mdev,
enum qlink_type type,
unsigned long qlink_id)
{
unsigned long id;
- struct vfio_ap_queue *q;
+

switch (type) {
case LINK_APID:
+ for_each_set_bit_inv(id, matrix_mdev->matrix.aqm,
+ matrix_mdev->matrix.aqm_max + 1)
+ vfio_ap_mdev_link_queue(matrix_mdev, qlink_id, id);
+ break;
case UNLINK_APID:
for_each_set_bit_inv(id, matrix_mdev->matrix.aqm,
- matrix_mdev->matrix.aqm_max + 1) {
- q = vfio_ap_get_queue(AP_MKQID(qlink_id, id));
- if (q) {
- if (type == LINK_APID)
- q->matrix_mdev = matrix_mdev;
- else
- q->matrix_mdev = NULL;
- }
- }
+ matrix_mdev->matrix.aqm_max + 1)
+ vfio_ap_mdev_unlink_queue(qlink_id, id);
+ break;
+ case LINK_APQI:
+ for_each_set_bit_inv(id, matrix_mdev->matrix.apm,
+ matrix_mdev->matrix.apm_max + 1)
+ vfio_ap_mdev_link_queue(matrix_mdev, id, qlink_id);
break;
default:
for_each_set_bit_inv(id, matrix_mdev->matrix.apm,
- matrix_mdev->matrix.apm_max + 1) {
- q = vfio_ap_get_queue(AP_MKQID(id, qlink_id));
- if (q) {
- if (type == LINK_APQI)
- q->matrix_mdev = matrix_mdev;
- else
- q->matrix_mdev = NULL;
- }
- }
+ matrix_mdev->matrix.apm_max + 1)
+ vfio_ap_mdev_unlink_queue(id, qlink_id);
break;
}
}
@@ -1612,6 +1645,7 @@ static void vfio_ap_queue_link_mdev(struct vfio_ap_queue *q)
if (test_bit_inv(apid, matrix_mdev->matrix.apm) &&
test_bit_inv(apqi, matrix_mdev->matrix.aqm)) {
q->matrix_mdev = matrix_mdev;
+ hash_add(matrix_mdev->qtable, &q->mdev_qnode, q->apqn);
break;
}
}
@@ -1647,6 +1681,10 @@ void vfio_ap_mdev_remove_queue(struct ap_queue *queue)
apqi = AP_QID_QUEUE(q->apqn);
vfio_ap_mdev_reset_queue(apid, apqi, 1);
vfio_ap_irq_disable(q);
+
+ if (q->matrix_mdev)
+ hash_del(&q->mdev_qnode);
+
kfree(q);
mutex_unlock(&matrix_dev->lock);
}
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index 8e24a073166b..055bce6d45db 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -89,6 +89,7 @@ struct ap_matrix_mdev {
struct kvm *kvm;
struct kvm_s390_module_hook pqap_hook;
struct mdev_device *mdev;
+ DECLARE_HASHTABLE(qtable, 8);
};

extern int vfio_ap_mdev_register(void);
@@ -100,6 +101,7 @@ struct vfio_ap_queue {
int apqn;
#define VFIO_AP_ISC_INVALID 0xff
unsigned char saved_isc;
+ struct hlist_node mdev_qnode;
};

int vfio_ap_mdev_probe_queue(struct ap_queue *queue);
--
2.21.1