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