drivers/virtio/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config VIRTIO
   3         tristate
   4         help
   5           This option is selected by any driver which implements the virtio
   6           bus, such as CONFIG_VIRTIO_PCI, CONFIG_VIRTIO_MMIO, CONFIG_RPMSG
   7           or CONFIG_S390_GUEST.
   8
   9 config ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
  10         bool
  11         help
  12           This option is selected if the architecture may need to enforce
  13           VIRTIO_F_ACCESS_PLATFORM
  14
  15 config VIRTIO_PCI_LIB
  16         tristate
  17         help
  18           Modern PCI device implementation. This module implements the
  19           basic probe and control for devices which are based on modern
  20           PCI device with possible vendor specific extensions. Any
  21           module that selects this module must depend on PCI.
  22
  23 menuconfig VIRTIO_MENU
  24         bool "Virtio drivers"
  25         default y
  26
  27 if VIRTIO_MENU
  28
  29 config VIRTIO_PCI
  30         tristate "PCI driver for virtio devices"
  31         depends on PCI
  32         select VIRTIO_PCI_LIB
  33         select VIRTIO
  34         help
  35           This driver provides support for virtio based paravirtual device
  36           drivers over PCI.  This requires that your VMM has appropriate PCI
  37           virtio backends.  Most QEMU based VMMs should support these devices
  38           (like KVM or Xen).
  39
  40           If unsure, say M.
  41
  42 config VIRTIO_PCI_LEGACY
  43         bool "Support for legacy virtio draft 0.9.X and older devices"
  44         default y
  45         depends on VIRTIO_PCI
  46         help
  47           Virtio PCI Card 0.9.X Draft (circa 2014) and older device support.
  48
  49           This option enables building a transitional driver, supporting
  50           both devices conforming to Virtio 1 specification, and legacy devices.
  51           If disabled, you get a slightly smaller, non-transitional driver,
  52           with no legacy compatibility.
  53
  54           So look out into your driveway.  Do you have a flying car?  If
  55           so, you can happily disable this option and virtio will not
  56           break.  Otherwise, leave it set.  Unless you're testing what
  57           life will be like in The Future.
  58
  59           If unsure, say Y.
  60
  61 config VIRTIO_VDPA
  62         tristate "vDPA driver for virtio devices"
  63         depends on VDPA
  64         select VIRTIO
  65         help
  66           This driver provides support for virtio based paravirtual
  67           device driver over vDPA bus. For this to be useful, you need
  68           an appropriate vDPA device implementation that operates on a
  69           physical device to allow the datapath of virtio to be
  70           offloaded to hardware.
  71
  72           If unsure, say M.
  73
  74 config VIRTIO_PMEM
  75         tristate "Support for virtio pmem driver"
  76         depends on VIRTIO
  77         depends on LIBNVDIMM
  78         help
  79           This driver provides access to virtio-pmem devices, storage devices
  80           that are mapped into the physical address space - similar to NVDIMMs
  81            - with a virtio-based flushing interface.
  82
  83           If unsure, say Y.
  84
  85 config VIRTIO_BALLOON
  86         tristate "Virtio balloon driver"
  87         depends on VIRTIO
  88         select MEMORY_BALLOON
  89         select PAGE_REPORTING
  90         help
  91          This driver supports increasing and decreasing the amount
  92          of memory within a KVM guest.
  93
  94          If unsure, say M.
  95
  96 config VIRTIO_MEM
  97         tristate "Virtio mem driver"
  98         default m
  99         depends on X86_64
 100         depends on VIRTIO
 101         depends on MEMORY_HOTPLUG_SPARSE
 102         depends on MEMORY_HOTREMOVE
 103         depends on CONTIG_ALLOC
 104         help
 105          This driver provides access to virtio-mem paravirtualized memory
 106          devices, allowing to hotplug and hotunplug memory.
 107
 108          This driver was only tested under x86-64, but should theoretically
 109          work on all architectures that support memory hotplug and hotremove.
 110
 111          If unsure, say M.
 112
 113 config VIRTIO_INPUT
 114         tristate "Virtio input driver"
 115         depends on VIRTIO
 116         depends on INPUT
 117         help
 118          This driver supports virtio input devices such as
 119          keyboards, mice and tablets.
 120
 121          If unsure, say M.
 122
 123 config VIRTIO_MMIO
 124         tristate "Platform bus driver for memory mapped virtio devices"
 125         depends on HAS_IOMEM && HAS_DMA
 126         select VIRTIO
 127         help
 128          This drivers provides support for memory mapped virtio
 129          platform device driver.
 130
 131          If unsure, say N.
 132
 133 config VIRTIO_MMIO_CMDLINE_DEVICES
 134         bool "Memory mapped virtio devices parameter parsing"
 135         depends on VIRTIO_MMIO
 136         help
 137          Allow virtio-mmio devices instantiation via the kernel command line
 138          or module parameters. Be aware that using incorrect parameters (base
 139          address in particular) can crash your system - you have been warned.
 140          See Documentation/admin-guide/kernel-parameters.rst for details.
 141
 142          If unsure, say 'N'.
 143
 144 config VIRTIO_DMA_SHARED_BUFFER
 145         tristate
 146         depends on DMA_SHARED_BUFFER
 147         help
 148          This option adds a flavor of dma buffers that are backed by
 149          virtio resources.
 150
 151 endif # VIRTIO_MENU