Re: [PATCH v11 06/14] s390/vfio-ap: introduce shadow APCB

[Halil Pasic <pasic@linux.ibm.com>]

On Thu, 22 Oct 2020 13:12:01 -0400
Tony Krowiak <akrowiak@linux.ibm.com> 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 <akrowiak@linux.ibm.com>
> ---
>  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 <pasic@linux.ibm.com>

>  	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;