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Message-Id: <20200407192015.19887-14-akrowiak@linux.ibm.com>
Date: Tue, 7 Apr 2020 15:20:13 -0400
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, pmorel@...ux.ibm.com, pasic@...ux.ibm.com,
alex.williamson@...hat.com, kwankhede@...dia.com,
jjherne@...ux.ibm.com, fiuczy@...ux.ibm.com,
Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: [PATCH v7 13/15] s390/vfio-ap: handle host AP config change notification
Implements the driver callback invoked by the AP bus when the host
AP configuration has changed. Since this callback is invoked prior to
unbinding a device from its device driver, the vfio_ap driver will
respond by unplugging the AP adapters, domains and control domains
removed from the host's AP configuration from the guests using them.
Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
---
drivers/s390/crypto/vfio_ap_drv.c | 5 +-
drivers/s390/crypto/vfio_ap_ops.c | 136 ++++++++++++++++++++++++--
drivers/s390/crypto/vfio_ap_private.h | 7 +-
3 files changed, 140 insertions(+), 8 deletions(-)
diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
index 5197a1fe14d4..9f6c5d82dfb5 100644
--- a/drivers/s390/crypto/vfio_ap_drv.c
+++ b/drivers/s390/crypto/vfio_ap_drv.c
@@ -113,9 +113,11 @@ static int vfio_ap_matrix_dev_create(void)
/* Fill in config info via PQAP(QCI), if available */
if (test_facility(12)) {
- ret = ap_qci(&matrix_dev->info);
+ ret = ap_qci(&matrix_dev->config_info);
if (ret)
goto matrix_alloc_err;
+ memcpy(&matrix_dev->config_info_prev, &matrix_dev->config_info,
+ sizeof(struct ap_config_info));
}
mutex_init(&matrix_dev->lock);
@@ -176,6 +178,7 @@ static int __init vfio_ap_init(void)
vfio_ap_drv.remove = vfio_ap_queue_dev_remove;
vfio_ap_drv.in_use = vfio_ap_mdev_resource_in_use;
vfio_ap_drv.ids = ap_queue_ids;
+ vfio_ap_drv.on_config_changed = vfio_ap_on_cfg_changed;
ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
if (ret) {
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 88a4aef5193f..f1dd77729dd9 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -336,8 +336,9 @@ 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_crycb);
+ vfio_ap_matrix_init(&matrix_dev->config_info, &matrix_mdev->matrix);
+ vfio_ap_matrix_init(&matrix_dev->config_info,
+ &matrix_mdev->shadow_crycb);
hash_init(matrix_mdev->qtable);
mdev_set_drvdata(mdev, matrix_mdev);
matrix_mdev->pqap_hook.hook = handle_pqap;
@@ -485,8 +486,8 @@ static int vfio_ap_mdev_filter_matrix(struct ap_matrix_mdev *matrix_mdev,
* If the APID is not assigned to the host AP configuration,
* we can not assign it to the guest's AP configuration
*/
- if (!test_bit_inv(apid,
- (unsigned long *)matrix_dev->info.apm)) {
+ if (!test_bit_inv(apid, (unsigned long *)
+ matrix_dev->config_info.apm)) {
clear_bit_inv(apid, shadow_crycb->apm);
continue;
}
@@ -499,7 +500,7 @@ static int vfio_ap_mdev_filter_matrix(struct ap_matrix_mdev *matrix_mdev,
* guest's AP configuration
*/
if (!test_bit_inv(apqi, (unsigned long *)
- matrix_dev->info.aqm)) {
+ matrix_dev->config_info.aqm)) {
clear_bit_inv(apqi, shadow_crycb->aqm);
continue;
}
@@ -1617,7 +1618,7 @@ int vfio_ap_mdev_probe_queue(struct ap_queue *queue)
void vfio_ap_mdev_remove_queue(struct ap_queue *queue)
{
struct vfio_ap_queue *q;
- int apid, apqi;
+ unsigned long apid, apqi;
mutex_lock(&matrix_dev->lock);
q = dev_get_drvdata(&queue->ap_dev.device);
@@ -1643,3 +1644,126 @@ bool vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm)
return in_use;
}
+
+/**
+ * vfio_ap_mdev_unassign_apids
+ *
+ * @matrix_mdev: The matrix mediated device
+ *
+ * @aqm: A bitmap with 256 bits. Each bit in the map represents an APID from 0
+ * to 255 (with the leftmost bit corresponding to APID 0).
+ *
+ * Unassigns each APID specified in @aqm that is assigned to the shadow CRYCB
+ * of @matrix_mdev. Returns true if at least one APID is unassigned; otherwise,
+ * returns false.
+ */
+bool vfio_ap_mdev_unassign_apids(struct ap_matrix_mdev *matrix_mdev,
+ unsigned long *apm_unassign)
+{
+ unsigned long apid;
+ bool unassigned = false;
+
+ /*
+ * If the matrix mdev is not in use by a KVM guest, return indicating
+ * that no APIDs have been unassigned.
+ */
+ if (!vfio_ap_mdev_has_crycb(matrix_mdev))
+ return false;
+
+ for_each_set_bit_inv(apid, apm_unassign, AP_DEVICES) {
+ unassigned |= vfio_ap_mdev_unassign_guest_apid(matrix_mdev,
+ apid);
+ }
+
+ return unassigned;
+}
+
+/**
+ * vfio_ap_mdev_unassign_apqis
+ *
+ * @matrix_mdev: The matrix mediated device
+ *
+ * @aqm: A bitmap with 256 bits. Each bit in the map represents an APQI from 0
+ * to 255 (with the leftmost bit corresponding to APQI 0).
+ *
+ * Unassigns each APQI specified in @aqm that is assigned to the shadow CRYCB
+ * of @matrix_mdev. Returns true if at least one APQI is unassigned; otherwise,
+ * returns false.
+ */
+bool vfio_ap_mdev_unassign_apqis(struct ap_matrix_mdev *matrix_mdev,
+ unsigned long *aqm_unassign)
+{
+ unsigned long apqi;
+ bool unassigned = false;
+
+ /*
+ * If the matrix mdev is not in use by a KVM guest, return indicating
+ * that no APQIs have been unassigned.
+ */
+ if (!vfio_ap_mdev_has_crycb(matrix_mdev))
+ return false;
+
+ for_each_set_bit_inv(apqi, aqm_unassign, AP_DOMAINS) {
+ unassigned |= vfio_ap_mdev_unassign_guest_apqi(matrix_mdev,
+ apqi);
+ }
+
+ return unassigned;
+}
+
+void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
+ struct ap_config_info *old_config_info)
+{
+ bool unassigned;
+ int ap_remove, aq_remove;
+ struct ap_matrix_mdev *matrix_mdev;
+ DECLARE_BITMAP(apm_unassign, AP_DEVICES);
+ DECLARE_BITMAP(aqm_unassign, AP_DOMAINS);
+
+ unsigned long *cur_apm, *cur_aqm, *prev_apm, *prev_aqm;
+
+ if (matrix_dev->flags & AP_MATRIX_CFG_CHG) {
+ WARN_ONCE(1, "AP host configuration change already reported");
+ return;
+ }
+
+ memcpy(&matrix_dev->config_info, new_config_info,
+ sizeof(struct ap_config_info));
+ memcpy(&matrix_dev->config_info_prev, old_config_info,
+ sizeof(struct ap_config_info));
+
+ cur_apm = (unsigned long *)matrix_dev->config_info.apm;
+ cur_aqm = (unsigned long *)matrix_dev->config_info.aqm;
+ prev_apm = (unsigned long *)matrix_dev->config_info_prev.apm;
+ prev_aqm = (unsigned long *)matrix_dev->config_info_prev.aqm;
+
+ ap_remove = bitmap_andnot(apm_unassign, prev_apm, cur_apm, AP_DEVICES);
+ aq_remove = bitmap_andnot(aqm_unassign, prev_aqm, cur_aqm, AP_DOMAINS);
+
+ mutex_lock(&matrix_dev->lock);
+ matrix_dev->flags |= AP_MATRIX_CFG_CHG;
+
+ list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
+ if (!vfio_ap_mdev_has_crycb(matrix_mdev))
+ continue;
+
+ unassigned = false;
+
+ if (ap_remove)
+ if (bitmap_intersects(matrix_mdev->shadow_crycb.apm,
+ apm_unassign, AP_DEVICES))
+ if (vfio_ap_mdev_unassign_apids(matrix_mdev,
+ apm_unassign))
+ unassigned = true;
+ if (aq_remove)
+ if (bitmap_intersects(matrix_mdev->shadow_crycb.aqm,
+ aqm_unassign, AP_DOMAINS))
+ if (vfio_ap_mdev_unassign_apqis(matrix_mdev,
+ aqm_unassign))
+ unassigned = true;
+
+ if (unassigned)
+ vfio_ap_mdev_commit_crycb(matrix_mdev);
+ }
+ mutex_unlock(&matrix_dev->lock);
+}
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index 794c60a767d2..82abbf03781f 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -40,11 +40,14 @@
struct ap_matrix_dev {
struct device device;
atomic_t available_instances;
- struct ap_config_info info;
+ struct ap_config_info config_info;
+ struct ap_config_info config_info_prev;
struct list_head mdev_list;
struct mutex lock;
struct ap_driver *vfio_ap_drv;
DECLARE_HASHTABLE(qtable, 8);
+ #define AP_MATRIX_CFG_CHG (1UL << 0)
+ unsigned long flags;
};
extern struct ap_matrix_dev *matrix_dev;
@@ -109,5 +112,7 @@ int vfio_ap_mdev_probe_queue(struct ap_queue *queue);
void vfio_ap_mdev_remove_queue(struct ap_queue *queue);
bool vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
+void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
+ struct ap_config_info *old_config_info);
#endif /* _VFIO_AP_PRIVATE_H_ */
--
2.21.1
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