[PATCH RFC v2 0/3] Add set_dev_data and unset_dev_data support

[Nicolin Chen <nicolinc@nvidia.com>]

This is a pair of new uAPI/ops for user space to set an iommu specific
device data for a passthrough device. This is primarily used by SMMUv3
driver for now, to link the vSID and the pSID of a device that's behind
the SMMU. The link (lookup table) will be used to verify any ATC_INV
command from the user space for that device, and then replace the SID
field (virtual SID) with the corresponding physical SID.

This series is available on Github:
https://github.com/nicolinc/iommufd/commits/set_dev_data-rfc-v2

Thanks!
Nicolin

Nicolin Chen (3):
  iommu: Add set/unset_dev_data_user ops
  iommufd: Add iommufd_device_set_data and iommufd_device_unset_data
    APIs
  vfio: Add dev_data_len/uptr in struct vfio_device_bind_iommufd

 drivers/iommu/iommufd/device.c | 65 ++++++++++++++++++++++++++++++++++
 drivers/vfio/device_cdev.c     | 19 ++++++++--
 drivers/vfio/iommufd.c         | 13 +++++++
 include/linux/iommu.h          |  6 ++++
 include/linux/iommufd.h        |  4 +++
 include/linux/vfio.h           |  2 ++
 include/uapi/linux/vfio.h      | 13 +++++++
 7 files changed, 120 insertions(+), 2 deletions(-)

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2.40.0