On 9/17/20 10:22 AM, Cornelia Huck wrote:
On Fri, 21 Aug 2020 15:56:06 -0400
Tony Krowiak <akrowiak@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
---
drivers/s390/crypto/vfio_ap_ops.c | 32 ++++++++++++++++++++++-----
drivers/s390/crypto/vfio_ap_private.h | 2 ++
2 files changed, 29 insertions(+), 5 deletions(-)
(...)
@@ -1202,13 +1223,12 @@ 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_crycb(matrix_mdev);
We are sure that the shadow APCB always matches up as we are the only
ones manipulating the APCB in the CRYCB, right?
Yes
return NOTIFY_OK;
}
