Re: [PATCH v2 0/3] net/virtio: support IOVA as PA mode for vDPA backend

[Maxime Coquelin <maxime.coquelin@redhat.com>]

On 2/29/24 14:29, Srujana Challa wrote:
> This patch series makes Virtio-user works in IOVA as PA mode
> for vDPA backend.
> 
> First patch fixes the issue when having buffer IOVA address in
> control queue descriptors.
> Second and third patches helps to share descriptor IOVA address,
> to the vhost backend. And also disables the use_va flag for VDPA
> backend type.
> 
> v1->v2:
> - Split single patch into three patches.
> 
> Srujana Challa (3):
>    net/virtio_user: avoid cq descriptor buffer address accessing
>    net/virtio: store desc IOVA address in vring data structure
>    net/virtio_user: support sharing vq descriptor IOVA to the backend
> 
>   drivers/net/virtio/virtio_ring.h              | 12 ++-
>   .../net/virtio/virtio_user/virtio_user_dev.c  | 94 ++++++++++---------
>   drivers/net/virtio/virtio_user_ethdev.c       | 10 +-
>   drivers/net/virtio/virtqueue.c                |  4 +-
>   4 files changed, 69 insertions(+), 51 deletions(-)
> 

I think we need a way to be able to perform the address translation from
iova to va between Virtio and Virtio-user layers. Does that sound
reasonable?

Thanks,
Maxime