Linux kernel mirror (for testing)
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linux
1# SPDX-License-Identifier: GPL-2.0-only
2config VIRTIO_ANCHOR
3 bool
4
5config VIRTIO
6 tristate
7 select VIRTIO_ANCHOR
8 help
9 This option is selected by any driver which implements the virtio
10 bus, such as CONFIG_VIRTIO_PCI, CONFIG_VIRTIO_MMIO, CONFIG_RPMSG
11 or CONFIG_S390_GUEST.
12
13config VIRTIO_PCI_LIB
14 tristate
15 help
16 Modern PCI device implementation. This module implements the
17 basic probe and control for devices which are based on modern
18 PCI device with possible vendor specific extensions. Any
19 module that selects this module must depend on PCI.
20
21config VIRTIO_PCI_LIB_LEGACY
22 tristate
23 help
24 Legacy PCI device (Virtio PCI Card 0.9.x Draft and older device)
25 implementation.
26 This module implements the basic probe and control for devices
27 which are based on legacy PCI device. Any module that selects this
28 module must depend on PCI.
29
30menuconfig VIRTIO_MENU
31 bool "Virtio drivers"
32 default y
33
34if VIRTIO_MENU
35
36config VIRTIO_HARDEN_NOTIFICATION
37 bool "Harden virtio notification"
38 depends on BROKEN
39 help
40 Enable this to harden the device notifications and suppress
41 those that happen at a time where notifications are illegal.
42
43 Experimental: Note that several drivers still have issues that
44 may cause crashes or hangs when correct handling of
45 notifications is enforced; depending on the subset of
46 drivers and devices you use, this may or may not work.
47
48 If unsure, say N.
49
50config VIRTIO_PCI
51 tristate "PCI driver for virtio devices"
52 depends on PCI
53 select VIRTIO_PCI_LIB
54 select VIRTIO
55 help
56 This driver provides support for virtio based paravirtual device
57 drivers over PCI. This requires that your VMM has appropriate PCI
58 virtio backends. Most QEMU based VMMs should support these devices
59 (like KVM or Xen).
60
61 If unsure, say M.
62
63config VIRTIO_PCI_ADMIN_LEGACY
64 bool
65 depends on VIRTIO_PCI && (X86 || COMPILE_TEST)
66 default y
67
68config VIRTIO_PCI_LEGACY
69 bool "Support for legacy virtio draft 0.9.X and older devices"
70 default y
71 depends on VIRTIO_PCI
72 select VIRTIO_PCI_LIB_LEGACY
73 help
74 Virtio PCI Card 0.9.X Draft (circa 2014) and older device support.
75
76 This option enables building a transitional driver, supporting
77 both devices conforming to Virtio 1 specification, and legacy devices.
78 If disabled, you get a slightly smaller, non-transitional driver,
79 with no legacy compatibility.
80
81 So look out into your driveway. Do you have a flying car? If
82 so, you can happily disable this option and virtio will not
83 break. Otherwise, leave it set. Unless you're testing what
84 life will be like in The Future.
85
86 If unsure, say Y.
87
88config VIRTIO_VDPA
89 tristate "vDPA driver for virtio devices"
90 depends on VDPA
91 select VIRTIO
92 help
93 This driver provides support for virtio based paravirtual
94 device driver over vDPA bus. For this to be useful, you need
95 an appropriate vDPA device implementation that operates on a
96 physical device to allow the datapath of virtio to be
97 offloaded to hardware.
98
99 If unsure, say M.
100
101config VIRTIO_PMEM
102 tristate "Support for virtio pmem driver"
103 depends on VIRTIO
104 depends on LIBNVDIMM
105 help
106 This driver provides access to virtio-pmem devices, storage devices
107 that are mapped into the physical address space - similar to NVDIMMs
108 - with a virtio-based flushing interface.
109
110 If unsure, say Y.
111
112config VIRTIO_BALLOON
113 tristate "Virtio balloon driver"
114 depends on VIRTIO
115 select MEMORY_BALLOON
116 select PAGE_REPORTING
117 help
118 This driver supports increasing and decreasing the amount
119 of memory within a KVM guest.
120
121 If unsure, say M.
122
123config VIRTIO_MEM
124 tristate "Virtio mem driver"
125 depends on X86_64 || ARM64 || RISCV || S390
126 depends on VIRTIO
127 depends on MEMORY_HOTPLUG
128 depends on MEMORY_HOTREMOVE
129 depends on CONTIG_ALLOC
130 depends on EXCLUSIVE_SYSTEM_RAM
131 help
132 This driver provides access to virtio-mem paravirtualized memory
133 devices, allowing to hotplug and hotunplug memory.
134
135 This driver currently supports x86-64, arm64, riscv and s390.
136 Although it should compile on other architectures that implement
137 memory hot(un)plug, architecture-specific and/or common
138 code changes may be required for virtio-mem, kdump and kexec to
139 work as expected.
140
141 If unsure, say M.
142
143config VIRTIO_INPUT
144 tristate "Virtio input driver"
145 depends on VIRTIO
146 depends on INPUT
147 help
148 This driver supports virtio input devices such as
149 keyboards, mice and tablets.
150
151 If unsure, say M.
152
153config VIRTIO_MMIO
154 tristate "Platform bus driver for memory mapped virtio devices"
155 depends on HAS_IOMEM && HAS_DMA
156 select VIRTIO
157 help
158 This drivers provides support for memory mapped virtio
159 platform device driver.
160
161 If unsure, say N.
162
163config VIRTIO_MMIO_CMDLINE_DEVICES
164 bool "Memory mapped virtio devices parameter parsing"
165 depends on VIRTIO_MMIO
166 help
167 Allow virtio-mmio devices instantiation via the kernel command line
168 or module parameters. Be aware that using incorrect parameters (base
169 address in particular) can crash your system - you have been warned.
170 See Documentation/admin-guide/kernel-parameters.rst for details.
171
172 If unsure, say 'N'.
173
174config VIRTIO_DMA_SHARED_BUFFER
175 tristate
176 depends on DMA_SHARED_BUFFER
177 help
178 This option adds a flavor of dma buffers that are backed by
179 virtio resources.
180
181config VIRTIO_DEBUG
182 bool "Debug facilities"
183 depends on VIRTIO
184 help
185 Enable this to expose debug facilities over debugfs.
186 This allows to debug features, to see what features the device
187 advertises and to set filter for features used by driver.
188
189 If unsure, say N.
190
191config VIRTIO_RTC
192 tristate "Virtio RTC driver"
193 depends on VIRTIO
194 depends on PTP_1588_CLOCK_OPTIONAL
195 help
196 This driver provides current time from a Virtio RTC device. The driver
197 provides the time through one or more clocks. The Virtio RTC PTP
198 clocks and/or the Real Time Clock driver for Virtio RTC must be
199 enabled to expose the clocks to userspace.
200
201 To compile this code as a module, choose M here: the module will be
202 called virtio_rtc.
203
204 If unsure, say M.
205
206if VIRTIO_RTC
207
208comment "WARNING: Consider enabling VIRTIO_RTC_PTP and/or VIRTIO_RTC_CLASS."
209 depends on !VIRTIO_RTC_PTP && !VIRTIO_RTC_CLASS
210
211comment "Enable PTP_1588_CLOCK in order to enable VIRTIO_RTC_PTP."
212 depends on PTP_1588_CLOCK=n
213
214config VIRTIO_RTC_PTP
215 bool "Virtio RTC PTP clocks"
216 default y
217 depends on PTP_1588_CLOCK
218 help
219 This exposes any Virtio RTC clocks as PTP Hardware Clocks (PHCs) to
220 userspace. The PHC sysfs attribute "clock_name" describes the clock
221 type.
222
223 If unsure, say Y.
224
225config VIRTIO_RTC_ARM
226 bool "Virtio RTC cross-timestamping using Arm Generic Timer"
227 default y
228 depends on VIRTIO_RTC_PTP && ARM_ARCH_TIMER
229 help
230 This enables Virtio RTC cross-timestamping using the Arm Generic Timer.
231 It only has an effect if the Virtio RTC device also supports this. The
232 cross-timestamp is available through the PTP clock driver precise
233 cross-timestamp ioctl (PTP_SYS_OFFSET_PRECISE2 aka
234 PTP_SYS_OFFSET_PRECISE).
235
236 If unsure, say Y.
237
238comment "Enable RTC_CLASS in order to enable VIRTIO_RTC_CLASS."
239 depends on RTC_CLASS=n
240
241config VIRTIO_RTC_CLASS
242 bool "Real Time Clock driver for Virtio RTC"
243 default y
244 depends on RTC_CLASS
245 help
246 This exposes the Virtio RTC UTC-like clock as a Linux Real Time Clock.
247 It only has an effect if the Virtio RTC device has a UTC-like clock
248 which smears leap seconds to avoid steps. The Real Time Clock is
249 read-only, and may support setting an alarm.
250
251 If unsure, say Y.
252
253endif # VIRTIO_RTC
254
255endif # VIRTIO_MENU