Enable VDPA support

[maxpain]

I would like to use Vitastor CSI, which supports VDUSE.
These kernel parameters are needed:

CONFIG_VDPA=m
CONFIG_VDPA_USER=m
CONFIG_VIRTIO_VDPA=m

[Kamillaova]

You forgot about CONFIG_VHOST_VDPA=m. This is not required for the Vitastor CSI, but is required in most other scenarios.

And it would be cool to also enable support for vDPA sim and hardware vDPA, so:

CONFIG_VDPA_SIM=m
CONFIG_VDPA_SIM_NET=m
CONFIG_VDPA_SIM_BLOCK=m

CONFIG_VP_VDPA=m # virtio PF (on PCI bus) to vDPA bridge

CONFIG_MLX5_VDPA=y # or m?
CONFIG_MLX5_VDPA_NET=m
CONFIG_MLX5_SF=m # required to use mlx5_vdpa

CONFIG_ALIBABA_ENI_VDPA=m
CONFIG_SNET_VDPA=m # SolidNET
CONFIG_PDS_VDPA=m # amd pensando dsc
CONFIG_OCTEONEP_VDPA=m # marvell octeon

reference: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/raw/main/config

[smira]

Isn't UBLK better than VDUSE in general?

[Kamillaova]

@smira Current Vitastor CSI doesn't support ublk, but yes, it is better.

But (hardware) vDPA is also commonly used for network virtualization.