On Thu, 22 Oct 2020 13:12:01 -0400 Tony Krowiak <[email protected]> wrote:
> The APCB is a field within the CRYCB that provides the AP configuration > to a KVM guest. Let's introduce a shadow copy of the KVM guest's APCB and > maintain it for the lifespan of the guest. > > Signed-off-by: Tony Krowiak <[email protected]> > --- > drivers/s390/crypto/vfio_ap_ops.c | 24 +++++++++++++++++++----- > drivers/s390/crypto/vfio_ap_private.h | 2 ++ > 2 files changed, 21 insertions(+), 5 deletions(-) > > diff --git a/drivers/s390/crypto/vfio_ap_ops.c > b/drivers/s390/crypto/vfio_ap_ops.c > index 9e9fad560859..9791761aa7fd 100644 > --- a/drivers/s390/crypto/vfio_ap_ops.c > +++ b/drivers/s390/crypto/vfio_ap_ops.c > @@ -320,6 +320,19 @@ static void vfio_ap_matrix_init(struct ap_config_info > *info, > matrix->adm_max = info->apxa ? info->Nd : 15; > } > > +static bool vfio_ap_mdev_has_crycb(struct ap_matrix_mdev *matrix_mdev) > +{ > + return (matrix_mdev->kvm && matrix_mdev->kvm->arch.crypto.crycbd); > +} > + > +static void vfio_ap_mdev_commit_shadow_apcb(struct ap_matrix_mdev > *matrix_mdev) > +{ > + kvm_arch_crypto_set_masks(matrix_mdev->kvm, > + matrix_mdev->shadow_apcb.apm, > + matrix_mdev->shadow_apcb.aqm, > + matrix_mdev->shadow_apcb.adm); > +} > + > static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device > *mdev) > { > struct ap_matrix_mdev *matrix_mdev; > @@ -335,6 +348,7 @@ 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; > @@ -1213,13 +1227,12 @@ 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) > + if (!vfio_ap_mdev_has_crycb(matrix_mdev)) > 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_apcb, &matrix_mdev->matrix, > + sizeof(matrix_mdev->shadow_apcb)); > + vfio_ap_mdev_commit_shadow_apcb(matrix_mdev); > > return NOTIFY_OK; > } > @@ -1329,6 +1342,7 @@ static void vfio_ap_mdev_release(struct mdev_device > *mdev) > kvm_put_kvm(matrix_mdev->kvm); > matrix_mdev->kvm = NULL; > } > + Unrelated change. Otherwise patch looks OK. Reviewed-by: Halil Pasic <[email protected]> > 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 c1d8b5507610..fc8634cee485 100644 > --- a/drivers/s390/crypto/vfio_ap_private.h > +++ b/drivers/s390/crypto/vfio_ap_private.h > @@ -75,6 +75,7 @@ struct ap_matrix { > * @list: allows the ap_matrix_mdev struct to be added to a list > * @matrix: the adapters, usage domains and control domains assigned to the > * mediated matrix device. > + * @shadow_apcb: the shadow copy of the APCB field of the KVM guest's > CRYCB > * @group_notifier: notifier block used for specifying callback function for > * handling the VFIO_GROUP_NOTIFY_SET_KVM event > * @kvm: the struct holding guest's state > @@ -82,6 +83,7 @@ struct ap_matrix { > struct ap_matrix_mdev { > struct list_head node; > struct ap_matrix matrix; > + struct ap_matrix shadow_apcb; > struct notifier_block group_notifier; > struct notifier_block iommu_notifier; > struct kvm *kvm;
