xref: /openbmc/linux/drivers/virtio/Kconfig (revision b4e18b29)
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 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
15menuconfig VIRTIO_MENU
16	bool "Virtio drivers"
17	default y
18
19if VIRTIO_MENU
20
21config VIRTIO_PCI
22	tristate "PCI driver for virtio devices"
23	depends on PCI
24	select VIRTIO
25	help
26	  This driver provides support for virtio based paravirtual device
27	  drivers over PCI.  This requires that your VMM has appropriate PCI
28	  virtio backends.  Most QEMU based VMMs should support these devices
29	  (like KVM or Xen).
30
31	  If unsure, say M.
32
33config VIRTIO_PCI_LEGACY
34	bool "Support for legacy virtio draft 0.9.X and older devices"
35	default y
36	depends on VIRTIO_PCI
37	help
38          Virtio PCI Card 0.9.X Draft (circa 2014) and older device support.
39
40	  This option enables building a transitional driver, supporting
41	  both devices conforming to Virtio 1 specification, and legacy devices.
42	  If disabled, you get a slightly smaller, non-transitional driver,
43	  with no legacy compatibility.
44
45          So look out into your driveway.  Do you have a flying car?  If
46          so, you can happily disable this option and virtio will not
47          break.  Otherwise, leave it set.  Unless you're testing what
48          life will be like in The Future.
49
50	  If unsure, say Y.
51
52config VIRTIO_VDPA
53	tristate "vDPA driver for virtio devices"
54	depends on VDPA
55	select VIRTIO
56	help
57	  This driver provides support for virtio based paravirtual
58	  device driver over vDPA bus. For this to be useful, you need
59	  an appropriate vDPA device implementation that operates on a
60	  physical device to allow the datapath of virtio to be
61	  offloaded to hardware.
62
63	  If unsure, say M.
64
65config VIRTIO_PMEM
66	tristate "Support for virtio pmem driver"
67	depends on VIRTIO
68	depends on LIBNVDIMM
69	help
70	  This driver provides access to virtio-pmem devices, storage devices
71	  that are mapped into the physical address space - similar to NVDIMMs
72	   - with a virtio-based flushing interface.
73
74	  If unsure, say Y.
75
76config VIRTIO_BALLOON
77	tristate "Virtio balloon driver"
78	depends on VIRTIO
79	select MEMORY_BALLOON
80	select PAGE_REPORTING
81	help
82	 This driver supports increasing and decreasing the amount
83	 of memory within a KVM guest.
84
85	 If unsure, say M.
86
87config VIRTIO_MEM
88	tristate "Virtio mem driver"
89	default m
90	depends on X86_64
91	depends on VIRTIO
92	depends on MEMORY_HOTPLUG_SPARSE
93	depends on MEMORY_HOTREMOVE
94	depends on CONTIG_ALLOC
95	help
96	 This driver provides access to virtio-mem paravirtualized memory
97	 devices, allowing to hotplug and hotunplug memory.
98
99	 This driver was only tested under x86-64, but should theoretically
100	 work on all architectures that support memory hotplug and hotremove.
101
102	 If unsure, say M.
103
104config VIRTIO_INPUT
105	tristate "Virtio input driver"
106	depends on VIRTIO
107	depends on INPUT
108	help
109	 This driver supports virtio input devices such as
110	 keyboards, mice and tablets.
111
112	 If unsure, say M.
113
114config VIRTIO_MMIO
115	tristate "Platform bus driver for memory mapped virtio devices"
116	depends on HAS_IOMEM && HAS_DMA
117	select VIRTIO
118	help
119	 This drivers provides support for memory mapped virtio
120	 platform device driver.
121
122 	 If unsure, say N.
123
124config VIRTIO_MMIO_CMDLINE_DEVICES
125	bool "Memory mapped virtio devices parameter parsing"
126	depends on VIRTIO_MMIO
127	help
128	 Allow virtio-mmio devices instantiation via the kernel command line
129	 or module parameters. Be aware that using incorrect parameters (base
130	 address in particular) can crash your system - you have been warned.
131	 See Documentation/admin-guide/kernel-parameters.rst for details.
132
133	 If unsure, say 'N'.
134
135config VIRTIO_DMA_SHARED_BUFFER
136	tristate
137	depends on DMA_SHARED_BUFFER
138	help
139	 This option adds a flavor of dma buffers that are backed by
140	 virtio resources.
141
142endif # VIRTIO_MENU
143