iommufd: Allow binding to a noiommu device

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Allow iommufd to bind devices without an IOMMU (noiommu mode) by creating
a dummy igroup for such devices and skipping hwpt operations.

This enables noiommu devices to operate through the same iommufd API as IOMMU-
capable devices.

Link: https://patch.msgid.link/r/2c6cf6ab1564426050e637863c9b0d3b25541c63.1783360051.git.jacob.pan@linux.microsoft.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Signed-off-by: Jacob Pan <jacob.pan@linux.microsoft.com>
Fixes: 2c6cf6ab1564 ("iommufd: Allow binding to a noiommu device")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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This commit is contained in:

Jason Gunthorpe 2026-07-06 11:48:31 -07:00

parent cfa8214875

commit 072f454c38

1 changed files with 118 additions and 40 deletions

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166

drivers/iommu/iommufd/device.c

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