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Subject[PATCH v7 05/15] s390/vfio-ap: introduce shadow CRYCB
Date
Let's introduce a shadow copy of the KVM guest's CRYCB and maintain it for
the lifespan of the guest. The shadow CRYCB will be used to provide the
AP configuration for a KVM guest.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 31 +++++++++++++++++++++------
drivers/s390/crypto/vfio_ap_private.h | 1 +
2 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 8ece0d52ff4c..b8b678032ab7 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -280,14 +280,32 @@ static int handle_pqap(struct kvm_vcpu *vcpu)
return 0;
}

+static void vfio_ap_matrix_clear(struct ap_matrix *matrix)
+{
+ bitmap_clear(matrix->apm, 0, AP_DEVICES);
+ bitmap_clear(matrix->aqm, 0, AP_DOMAINS);
+ bitmap_clear(matrix->adm, 0, AP_DOMAINS);
+}
+
static void vfio_ap_matrix_init(struct ap_config_info *info,
struct ap_matrix *matrix)
{
+ vfio_ap_matrix_clear(matrix);
matrix->apm_max = info->apxa ? info->Na : 63;
matrix->aqm_max = info->apxa ? info->Nd : 15;
matrix->adm_max = info->apxa ? info->Nd : 15;
}

+static bool vfio_ap_mdev_commit_crycb(struct ap_matrix_mdev *matrix_mdev)
+{
+ if (matrix_mdev->kvm && matrix_mdev->kvm->arch.crypto.crycbd) {
+ kvm_arch_crypto_set_masks(matrix_mdev->kvm,
+ matrix_mdev->shadow_crycb.apm,
+ matrix_mdev->shadow_crycb.aqm,
+ matrix_mdev->shadow_crycb.adm);
+ }
+}
+
static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
{
struct ap_matrix_mdev *matrix_mdev;
@@ -303,6 +321,7 @@ 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_crycb);
mdev_set_drvdata(mdev, matrix_mdev);
matrix_mdev->pqap_hook.hook = handle_pqap;
matrix_mdev->pqap_hook.owner = THIS_MODULE;
@@ -1126,13 +1145,9 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
if (ret)
return NOTIFY_DONE;

- /* If there is no CRYCB pointer, then we can't copy the masks */
- if (!matrix_mdev->kvm->arch.crypto.crycbd)
- return NOTIFY_DONE;
-
- kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
- matrix_mdev->matrix.aqm,
- matrix_mdev->matrix.adm);
+ memcpy(&matrix_mdev->shadow_crycb, &matrix_mdev->matrix,
+ sizeof(matrix_mdev->shadow_crycb));
+ vfio_ap_mdev_commit_crycb(matrix_mdev);

return NOTIFY_OK;
}
@@ -1247,6 +1262,8 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev)
kvm_put_kvm(matrix_mdev->kvm);
matrix_mdev->kvm = NULL;
}
+
+ vfio_ap_matrix_clear(&matrix_mdev->shadow_crycb);
mutex_unlock(&matrix_dev->lock);

vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index 4b6e144bab17..87cc270c3212 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -83,6 +83,7 @@ struct ap_matrix {
struct ap_matrix_mdev {
struct list_head node;
struct ap_matrix matrix;
+ struct ap_matrix shadow_crycb;
struct notifier_block group_notifier;
struct notifier_block iommu_notifier;
struct kvm *kvm;
--
2.21.1
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