[PATCH v2 0/4] dma-buf: document revoke mechanism to invalidate shared buffers

[Leon Romanovsky]

Changelog:
v2:
 * Changed series to document the revoke semantics instead of
   implementing it.
v1: https://patch.msgid.link/20260111-dmabuf-revoke-v1-0-fb4bcc8c259b@xxxxxxxxxx

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This series documents a dma-buf “revoke” mechanism: to allow a dma-buf
exporter to explicitly invalidate (“kill”) a shared buffer after it has
been distributed to importers, so that further CPU and device access is
prevented and importers reliably observe failure.

The change in this series is to properly document and use existing core
“revoked” state on the dma-buf object and a corresponding exporter-triggered
revoke operation. Once a dma-buf is revoked, new access paths are blocked so
that attempts to DMA-map, vmap, or mmap the buffer fail in a consistent way.

Thanks

Cc: linux-media@xxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxx
Cc: intel-xe@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-rdma@xxxxxxxxxxxxxxx
Cc: iommu@xxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
To: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
To: Christian König <christian.koenig@xxxxxxx>
To: Alex Deucher <alexander.deucher@xxxxxxx>
To: David Airlie <airlied@xxxxxxxxx>
To: Simona Vetter <simona@xxxxxxxx>
To: Gerd Hoffmann <kraxel@xxxxxxxxxx>
To: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>
To: Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>
To: Chia-I Wu <olvaffe@xxxxxxxxx>
To: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
To: Maxime Ripard <mripard@xxxxxxxxxx>
To: Thomas Zimmermann <tzimmermann@xxxxxxx>
To: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
To: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
To: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
To: Jason Gunthorpe <jgg@xxxxxxxx>
To: Leon Romanovsky <leon@xxxxxxxxxx>
To: Kevin Tian <kevin.tian@xxxxxxxxx>
To: Joerg Roedel <joro@xxxxxxxxxx>
To: Will Deacon <will@xxxxxxxxxx>
To: Robin Murphy <robin.murphy@xxxxxxx>
To: Alex Williamson <alex@xxxxxxxxxxx>

---
Leon Romanovsky (4):
      dma-buf: Rename .move_notify() callback to a clearer identifier
      dma-buf: Document revoke semantics
      iommufd: Require DMABUF revoke semantics
      vfio: Add pinned interface to perform revoke semantics

 drivers/dma-buf/dma-buf.c                   |  6 +++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c |  4 ++--
 drivers/gpu/drm/virtio/virtgpu_prime.c      |  2 +-
 drivers/gpu/drm/xe/tests/xe_dma_buf.c       |  6 +++---
 drivers/gpu/drm/xe/xe_dma_buf.c             |  2 +-
 drivers/infiniband/core/umem_dmabuf.c       |  4 ++--
 drivers/infiniband/hw/mlx5/mr.c             |  2 +-
 drivers/iommu/iommufd/pages.c               | 11 +++++++++--
 drivers/vfio/pci/vfio_pci_dmabuf.c          | 16 ++++++++++++++++
 include/linux/dma-buf.h                     | 25 ++++++++++++++++++++++---
 10 files changed, 60 insertions(+), 18 deletions(-)
---
base-commit: 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb
change-id: 20251221-dmabuf-revoke-b90ef16e4236

Best regards,
--  
Leon Romanovsky <leonro@xxxxxxxxxx>