linux-kernel - [PATCH V5 0/9] Refine virtio mapping API

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Message-ID: <20250813054831.25865-1-jasowang@redhat.com>
Date: Wed, 13 Aug 2025 13:48:22 +0800
From: Jason Wang <jasowang@...hat.com>
To: mst@...hat.com,
	jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com,
	eperezma@...hat.com,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Cc: hch@...radead.org
Subject: [PATCH V5 0/9] Refine virtio mapping API

Hi all:

Virtio used to be coupled with DMA API. This works fine for the device
that do real DMA but not the others. For example, VDUSE nees to craft
with DMA API in order to let the virtio-vdpa driver to work.

This series tries to solve this issue by introducing the mapping API
in the virtio core. So transport like vDPA can implement their own
mapping logic without the need to hack with DMA API. The mapping API
are abstracted with a new map operations in order to be re-used by
transprot or device. So device like VDUSE can implement its own
mapping loigc.

For device that uses DMA (for example PCI device), the virtio core
will still call DMA API directly without the need of implementing map
ops per device/transport.

Please review.

Changes since V4:

- Rename map_token to mapping_token
- Introduce a union container for opaque token as well as the DMA
  device so we won't lose the type safety
- Do not try to set DMA mask for VDUSE device
- Introduce a new mapper_error op for API completeness

Changes since V3:

- Fix build error of PDS vDPA driver

Changes since V2:

- Drop VDUSE dependenct for HAS_DMA and ARCH_HAS_DMA_OPS

Changes since V1:

- Fix build error of mlx5_vdpa driver

Jason Wang (9):
  virtio_ring: constify virtqueue pointer for DMA helpers
  virtio_ring: switch to use dma_{map|unmap}_page()
  virtio: rename dma helpers
  virtio: introduce vring_mapping_token
  virtio_ring: rename dma_handle to map_handle
  virtio: introduce map ops in virtio core
  vdpa: support mapping token
  vdpa: introduce map ops
  vduse: switch to use virtio map API instead of DMA API

 drivers/net/virtio_net.c                 |  28 +-
 drivers/vdpa/Kconfig                     |   8 +-
 drivers/vdpa/alibaba/eni_vdpa.c          |   5 +-
 drivers/vdpa/ifcvf/ifcvf_main.c          |   5 +-
 drivers/vdpa/mlx5/core/mr.c              |   4 +-
 drivers/vdpa/mlx5/net/mlx5_vnet.c        |  15 +-
 drivers/vdpa/octeon_ep/octep_vdpa_main.c |   6 +-
 drivers/vdpa/pds/vdpa_dev.c              |   5 +-
 drivers/vdpa/solidrun/snet_main.c        |   8 +-
 drivers/vdpa/vdpa.c                      |   5 +-
 drivers/vdpa/vdpa_sim/vdpa_sim.c         |   4 +-
 drivers/vdpa/vdpa_user/iova_domain.c     |   2 +-
 drivers/vdpa/vdpa_user/iova_domain.h     |   2 +-
 drivers/vdpa/vdpa_user/vduse_dev.c       |  76 ++--
 drivers/vdpa/virtio_pci/vp_vdpa.c        |   5 +-
 drivers/vhost/vdpa.c                     |  18 +-
 drivers/virtio/virtio_ring.c             | 471 ++++++++++++++---------
 drivers/virtio/virtio_vdpa.c             |  17 +-
 include/linux/vdpa.h                     |  25 +-
 include/linux/virtio.h                   |  43 ++-
 include/linux/virtio_config.h            |  72 ++++
 include/linux/virtio_ring.h              |   7 +-
 22 files changed, 545 insertions(+), 286 deletions(-)

-- 
2.31.1