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Create just a little part of a real iommu driver, enough to slot in under the dev_iommu_ops() and allow iommufd to call domain_alloc_paging_flags() and fail everything else. This allows explicitly creating a HWPT under an IOAS. A new Kconfig option IOMMUFD_NOIOMMU is introduced to differentiate from the VFIO group/container based noiommu mode. Link: https://patch.msgid.link/r/8d1ad0b90db0381d4139eda5c126cc8d168d89f8.1783360051.git.jacob.pan@linux.microsoft.com Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Samiullah Khawaja <skhawaja@google.com> Reviewed-by: Kevin Tian <kevin.tian@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") Reviewed-by: Yi Liu <yi.l.liu@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config IOMMUFD_DRIVER_CORE
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bool
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default (IOMMUFD_DRIVER || IOMMUFD) if IOMMUFD!=n
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config IOMMUFD
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tristate "IOMMU Userspace API"
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select INTERVAL_TREE
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select INTERVAL_TREE_SPAN_ITER
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select IOMMU_API
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default n
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help
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Provides /dev/iommu, the user API to control the IOMMU subsystem as
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it relates to managing IO page tables that point at user space memory.
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If you don't know what to do here, say N.
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if IOMMUFD
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config IOMMUFD_NOIOMMU
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bool
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depends on !GENERIC_ATOMIC64 # IOMMU_PT_AMDV1 requires cmpxchg64
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select GENERIC_PT
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select IOMMU_PT
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select IOMMU_PT_AMDV1
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help
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Provides a SW-only IO page table for devices without hardware
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IOMMU backing. This uses the AMDV1 page table format for
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IOVA-to-PA lookups only, not for hardware DMA translation.
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To be selected by VFIO_NOIOMMU when VFIO_DEVICE_CDEV is enabled.
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config IOMMUFD_VFIO_CONTAINER
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bool "IOMMUFD provides the VFIO container /dev/vfio/vfio"
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depends on VFIO_GROUP && !VFIO_CONTAINER
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default VFIO_GROUP && !VFIO_CONTAINER
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help
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IOMMUFD will provide /dev/vfio/vfio instead of VFIO. This relies on
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IOMMUFD providing compatibility emulation to give the same ioctls.
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It provides an option to build a kernel with legacy VFIO components
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removed.
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IOMMUFD VFIO container emulation is known to lack certain features
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of the native VFIO container, such as peer-to-peer
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DMA mapping, PPC IOMMU support, as well as other potentially
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undiscovered gaps. This option is currently intended for the
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purpose of testing IOMMUFD with unmodified userspace supporting VFIO
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and making use of the Type1 VFIO IOMMU backend. General purpose
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enabling of this option is currently discouraged.
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Unless testing IOMMUFD, say N here.
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config IOMMUFD_TEST
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bool "IOMMU Userspace API Test support"
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depends on DEBUG_KERNEL
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depends on FAULT_INJECTION
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depends on RUNTIME_TESTING_MENU
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depends on IOMMU_PT_AMDV1=y || IOMMUFD=IOMMU_PT_AMDV1
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select DMA_SHARED_BUFFER
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select IOMMUFD_DRIVER
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default n
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help
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This is dangerous, do not enable unless running
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tools/testing/selftests/iommu
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endif
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