Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1# SPDX-License-Identifier: GPL-2.0-only
2config 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
9config VIRTIO_PCI_LIB
10 tristate
11 help
12 Modern PCI device implementation. This module implements the
13 basic probe and control for devices which are based on modern
14 PCI device with possible vendor specific extensions. Any
15 module that selects this module must depend on PCI.
16
17config VIRTIO_PCI_LIB_LEGACY
18 tristate
19 help
20 Legacy PCI device (Virtio PCI Card 0.9.x Draft and older device)
21 implementation.
22 This module implements the basic probe and control for devices
23 which are based on legacy PCI device. Any module that selects this
24 module must depend on PCI.
25
26menuconfig VIRTIO_MENU
27 bool "Virtio drivers"
28 default y
29
30if VIRTIO_MENU
31
32config VIRTIO_PCI
33 tristate "PCI driver for virtio devices"
34 depends on PCI
35 select VIRTIO_PCI_LIB
36 select VIRTIO
37 help
38 This driver provides support for virtio based paravirtual device
39 drivers over PCI. This requires that your VMM has appropriate PCI
40 virtio backends. Most QEMU based VMMs should support these devices
41 (like KVM or Xen).
42
43 If unsure, say M.
44
45config VIRTIO_PCI_LEGACY
46 bool "Support for legacy virtio draft 0.9.X and older devices"
47 default y
48 depends on VIRTIO_PCI
49 select VIRTIO_PCI_LIB_LEGACY
50 help
51 Virtio PCI Card 0.9.X Draft (circa 2014) and older device support.
52
53 This option enables building a transitional driver, supporting
54 both devices conforming to Virtio 1 specification, and legacy devices.
55 If disabled, you get a slightly smaller, non-transitional driver,
56 with no legacy compatibility.
57
58 So look out into your driveway. Do you have a flying car? If
59 so, you can happily disable this option and virtio will not
60 break. Otherwise, leave it set. Unless you're testing what
61 life will be like in The Future.
62
63 If unsure, say Y.
64
65config VIRTIO_VDPA
66 tristate "vDPA driver for virtio devices"
67 depends on VDPA
68 select VIRTIO
69 help
70 This driver provides support for virtio based paravirtual
71 device driver over vDPA bus. For this to be useful, you need
72 an appropriate vDPA device implementation that operates on a
73 physical device to allow the datapath of virtio to be
74 offloaded to hardware.
75
76 If unsure, say M.
77
78config VIRTIO_PMEM
79 tristate "Support for virtio pmem driver"
80 depends on VIRTIO
81 depends on LIBNVDIMM
82 help
83 This driver provides access to virtio-pmem devices, storage devices
84 that are mapped into the physical address space - similar to NVDIMMs
85 - with a virtio-based flushing interface.
86
87 If unsure, say Y.
88
89config VIRTIO_BALLOON
90 tristate "Virtio balloon driver"
91 depends on VIRTIO
92 select MEMORY_BALLOON
93 select PAGE_REPORTING
94 help
95 This driver supports increasing and decreasing the amount
96 of memory within a KVM guest.
97
98 If unsure, say M.
99
100config VIRTIO_MEM
101 tristate "Virtio mem driver"
102 depends on X86_64 || ARM64
103 depends on VIRTIO
104 depends on MEMORY_HOTPLUG
105 depends on MEMORY_HOTREMOVE
106 depends on CONTIG_ALLOC
107 depends on EXCLUSIVE_SYSTEM_RAM
108 help
109 This driver provides access to virtio-mem paravirtualized memory
110 devices, allowing to hotplug and hotunplug memory.
111
112 This driver was only tested under x86-64 and arm64, but should
113 theoretically work on all architectures that support memory hotplug
114 and hotremove.
115
116 If unsure, say M.
117
118config VIRTIO_INPUT
119 tristate "Virtio input driver"
120 depends on VIRTIO
121 depends on INPUT
122 help
123 This driver supports virtio input devices such as
124 keyboards, mice and tablets.
125
126 If unsure, say M.
127
128config VIRTIO_MMIO
129 tristate "Platform bus driver for memory mapped virtio devices"
130 depends on HAS_IOMEM && HAS_DMA
131 select VIRTIO
132 help
133 This drivers provides support for memory mapped virtio
134 platform device driver.
135
136 If unsure, say N.
137
138config VIRTIO_MMIO_CMDLINE_DEVICES
139 bool "Memory mapped virtio devices parameter parsing"
140 depends on VIRTIO_MMIO
141 help
142 Allow virtio-mmio devices instantiation via the kernel command line
143 or module parameters. Be aware that using incorrect parameters (base
144 address in particular) can crash your system - you have been warned.
145 See Documentation/admin-guide/kernel-parameters.rst for details.
146
147 If unsure, say 'N'.
148
149config VIRTIO_DMA_SHARED_BUFFER
150 tristate
151 depends on DMA_SHARED_BUFFER
152 help
153 This option adds a flavor of dma buffers that are backed by
154 virtio resources.
155
156endif # VIRTIO_MENU