On 07/26/2018 09:54 PM, Christian Borntraeger wrote:
[...]
> +static void kvm_ap_merge_bitmasks(unsigned long *dst, unsigned long *mask1,
> + unsigned long *mask2, unsigned long nbits)
> +{
> + int i;
> +
> + for (i = 0; i < BITS_TO_LONGS(nbits); i++)
> + dst[i] = mask1[i] | mask2[i];
> +}
Could you use the standard bitmap_or() function instead of implementing
your own version?
> +static void vfio_ap_mdev_copy_masks(struct ap_matrix_mdev *matrix_mdev,
> + struct kvm_s390_crypto_cb *crycb)
> +{
> + int nbytes;
> + unsigned long *apm, *aqm, *adm;
> +
> + switch (matrix_mdev->kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
> + case CRYCB_FORMAT2:
> + apm = (unsigned long *)crycb->apcb1.apm;
> + aqm = (unsigned long *)crycb->apcb1.aqm;
> + adm = (unsigned long *)crycb->apcb1.adm;
> + break;
> + case CRYCB_FORMAT1:
> + case CRYCB_FORMAT0:
> + default:
> + apm = (unsigned long *)crycb->apcb0.apm;
> + aqm = (unsigned long *)crycb->apcb0.aqm;
> + adm = (unsigned long *)crycb->apcb0.adm;
> + break;
> + }
> +
> + nbytes = DIV_ROUND_UP(matrix_mdev->matrix.apm_max + 1, BITS_PER_BYTE);
> + memcpy(apm, matrix_mdev->matrix.apm, nbytes);
> + nbytes = DIV_ROUND_UP(matrix_mdev->matrix.aqm_max + 1, BITS_PER_BYTE);
> + memcpy(aqm, matrix_mdev->matrix.aqm, nbytes);
> + kvm_ap_merge_bitmasks(adm, aqm, adm, matrix_mdev->matrix.adm_max + 1);
> +}
> +
> +static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
> + unsigned long action, void *data)
> +{
> + int ret;
> + struct ap_matrix_mdev *matrix_mdev;
> + struct kvm_s390_crypto_cb *crycb;
> +
> + if (action == VFIO_GROUP_NOTIFY_SET_KVM) {
> + matrix_mdev = container_of(nb, struct ap_matrix_mdev,
> + group_notifier);
> + matrix_mdev->kvm = data;
> + crycb = matrix_mdev->kvm->arch.crypto.crycb;
> +
> + ret = kvm_ap_validate_crypto_setup(matrix_mdev->kvm);
> + if (ret)
> + return ret;
> +
> + /* NOTE: Happens before any vcpu is running (no hotplug). */
> + vfio_ap_mdev_copy_masks(matrix_mdev, crycb);
> + if (ret)
> + return ret;
> + }
> +
> + return NOTIFY_OK;
> +}
> +
> +/**
> + * vfio_ap_mdev_open_once
> + *
> + * @matrix_mdev: a mediated matrix device
> + *
> + * Return 0 if no other mediated matrix device has been opened for the
> + * KVM guest assigned to @matrix_mdev; otherwise, returns an error.
> + */
> +static int vfio_ap_mdev_open_once(struct ap_matrix_mdev *matrix_mdev)
> +{
> + int ret = 0;
> + struct ap_matrix_mdev *lstdev;
> +
> + list_for_each_entry(lstdev, &matrix_dev.mdev_list, list) {
> + if ((lstdev->kvm == matrix_mdev->kvm) &&
> + (lstdev != matrix_mdev)) {
Too much parentheses again for my taste ;-)
> + ret = -EPERM;
> + break;
> + }
> + }
Thomas
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