Re: [PATCH for 8.1 v2 3/6] vdpa: add vhost_vdpa_set_dev_features_fd

[Jason Wang]

On Fri, Mar 24, 2023 at 3:54 AM Eugenio Pérez <eperezma@redhat.com> wrote:
>
> This allows to set the features of a vhost-vdpa device from external
> subsystems like vhost-net.  It is used in subsequent patches to
> negotiate features and probe for CVQ ASID isolation.
>
> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
> Signed-off-by: Eugenio Pérez <eperezma@redhat.com>

Acked-by: Jason Wang <jasowang@redhat.com>

Thanks

> ---
>  include/hw/virtio/vhost-vdpa.h |  1 +
>  hw/virtio/vhost-vdpa.c         | 20 +++++++++++++-------
>  2 files changed, 14 insertions(+), 7 deletions(-)
>
> diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
> index 28de7da91e..a9cb6f3a32 100644
> --- a/include/hw/virtio/vhost-vdpa.h
> +++ b/include/hw/virtio/vhost-vdpa.h
> @@ -55,6 +55,7 @@ typedef struct vhost_vdpa {
>  } VhostVDPA;
>
>  void vhost_vdpa_reset_status_fd(int fd);
> +int vhost_vdpa_set_dev_features_fd(int fd, uint64_t features);
>  int vhost_vdpa_get_iova_range(int fd, struct vhost_vdpa_iova_range 
> *iova_range);
>
>  int vhost_vdpa_dma_map(struct vhost_vdpa *v, uint32_t asid, hwaddr iova,
> diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
> index 7a2053b8d9..acd5be46a9 100644
> --- a/hw/virtio/vhost-vdpa.c
> +++ b/hw/virtio/vhost-vdpa.c
> @@ -651,11 +651,22 @@ static int vhost_vdpa_set_mem_table(struct vhost_dev 
> *dev,
>      return 0;
>  }
>
> +int vhost_vdpa_set_dev_features_fd(int fd, uint64_t features)
> +{
> +    int ret;
> +
> +    ret = vhost_vdpa_call_fd(fd, VHOST_SET_FEATURES, &features);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    return vhost_vdpa_add_status_fd(fd, VIRTIO_CONFIG_S_FEATURES_OK);
> +}
> +
>  static int vhost_vdpa_set_features(struct vhost_dev *dev,
>                                     uint64_t features)
>  {
>      struct vhost_vdpa *v = dev->opaque;
> -    int ret;
>
>      if (!vhost_vdpa_first_dev(dev)) {
>          return 0;
> @@ -678,12 +689,7 @@ static int vhost_vdpa_set_features(struct vhost_dev *dev,
>      }
>
>      trace_vhost_vdpa_set_features(dev, features);
> -    ret = vhost_vdpa_call(dev, VHOST_SET_FEATURES, &features);
> -    if (ret) {
> -        return ret;
> -    }
> -
> -    return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
> +    return vhost_vdpa_set_dev_features_fd(vhost_vdpa_dev_fd(dev), features);
>  }
>
>  static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev)
> --
> 2.31.1
>