drivers/vfio/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 menuconfig VFIO
   3         tristate "VFIO Non-Privileged userspace driver framework"
   4         select IOMMU_API
   5         depends on IOMMUFD || !IOMMUFD
   6         select INTERVAL_TREE
   7         select VFIO_GROUP if SPAPR_TCE_IOMMU || IOMMUFD=n
   8         select VFIO_DEVICE_CDEV if !VFIO_GROUP
   9         select VFIO_CONTAINER if IOMMUFD=n
  10         help
  11           VFIO provides a framework for secure userspace device drivers.
  12           See Documentation/driver-api/vfio.rst for more details.
  13
  14           If you don't know what to do here, say N.
  15
  16 if VFIO
  17 config VFIO_DEVICE_CDEV
  18         bool "Support for the VFIO cdev /dev/vfio/devices/vfioX"
  19         depends on IOMMUFD && !SPAPR_TCE_IOMMU
  20         default !VFIO_GROUP
  21         help
  22           The VFIO device cdev is another way for userspace to get device
  23           access. Userspace gets device fd by opening device cdev under
  24           /dev/vfio/devices/vfioX, and then bind the device fd with an iommufd
  25           to set up secure DMA context for device access.  This interface does
  26           not support noiommu.
  27
  28           If you don't know what to do here, say N.
  29
  30 config VFIO_GROUP
  31         bool "Support for the VFIO group /dev/vfio/$group_id"
  32         default y
  33         help
  34            VFIO group support provides the traditional model for accessing
  35            devices through VFIO and is used by the majority of userspace
  36            applications and drivers making use of VFIO.
  37
  38            If you don't know what to do here, say Y.
  39
  40 config VFIO_CONTAINER
  41         bool "Support for the VFIO container /dev/vfio/vfio"
  42         select VFIO_IOMMU_TYPE1 if MMU && (X86 || S390 || ARM || ARM64)
  43         depends on VFIO_GROUP
  44         default y
  45         help
  46           The VFIO container is the classic interface to VFIO for establishing
  47           IOMMU mappings. If N is selected here then IOMMUFD must be used to
  48           manage the mappings.
  49
  50           Unless testing IOMMUFD say Y here.
  51
  52 if VFIO_CONTAINER
  53 config VFIO_IOMMU_TYPE1
  54         tristate
  55         default n
  56
  57 config VFIO_IOMMU_SPAPR_TCE
  58         tristate
  59         depends on SPAPR_TCE_IOMMU
  60         default VFIO
  61 endif
  62
  63 config VFIO_NOIOMMU
  64         bool "VFIO No-IOMMU support"
  65         depends on VFIO_GROUP
  66         help
  67           VFIO is built on the ability to isolate devices using the IOMMU.
  68           Only with an IOMMU can userspace access to DMA capable devices be
  69           considered secure.  VFIO No-IOMMU mode enables IOMMU groups for
  70           devices without IOMMU backing for the purpose of re-using the VFIO
  71           infrastructure in a non-secure mode.  Use of this mode will result
  72           in an unsupportable kernel and will therefore taint the kernel.
  73           Device assignment to virtual machines is also not possible with
  74           this mode since there is no IOMMU to provide DMA translation.
  75
  76           If you don't know what to do here, say N.
  77
  78 config VFIO_VIRQFD
  79         bool
  80         select EVENTFD
  81         default n
  82
  83 config VFIO_DEBUGFS
  84         bool "Export VFIO internals in DebugFS"
  85         depends on DEBUG_FS
  86         help
  87           Allows exposure of VFIO device internals. This option enables
  88           the use of debugfs by VFIO drivers as required. The device can
  89           cause the VFIO code create a top-level debug/vfio directory
  90           during initialization, and then populate a subdirectory with
  91           entries as required.
  92
  93 source "drivers/vfio/pci/Kconfig"
  94 source "drivers/vfio/platform/Kconfig"
  95 source "drivers/vfio/mdev/Kconfig"
  96 source "drivers/vfio/fsl-mc/Kconfig"
  97 source "drivers/vfio/cdx/Kconfig"
  98 endif
  99
 100 source "virt/lib/Kconfig"