linux-yocto/drivers/virtio/Kconfig

SPDX-License-Identifier: GPL-2.0-only

config VIRTIO_ANCHOR bool

config VIRTIO tristate select VIRTIO_ANCHOR help This option is selected by any driver which implements the virtio bus, such as CONFIG_VIRTIO_PCI, CONFIG_VIRTIO_MMIO, CONFIG_RPMSG or CONFIG_S390_GUEST.

config VIRTIO_PCI_LIB tristate help Modern PCI device implementation. This module implements the basic probe and control for devices which are based on modern PCI device with possible vendor specific extensions. Any module that selects this module must depend on PCI.

config VIRTIO_PCI_LIB_LEGACY tristate help Legacy PCI device (Virtio PCI Card 0.9.x Draft and older device) implementation. This module implements the basic probe and control for devices which are based on legacy PCI device. Any module that selects this module must depend on PCI.

menuconfig VIRTIO_MENU bool "Virtio drivers" default y

if VIRTIO_MENU

config VIRTIO_HARDEN_NOTIFICATION bool "Harden virtio notification" depends on BROKEN help Enable this to harden the device notifications and suppress those that happen at a time where notifications are illegal.

      Experimental: Note that several drivers still have issues that
      may cause crashes or hangs when correct handling of
      notifications is enforced; depending on the subset of
      drivers and devices you use, this may or may not work.

      If unsure, say N.

config VIRTIO_PCI tristate "PCI driver for virtio devices" depends on PCI select VIRTIO_PCI_LIB select VIRTIO help This driver provides support for virtio based paravirtual device drivers over PCI. This requires that your VMM has appropriate PCI virtio backends. Most QEMU based VMMs should support these devices (like KVM or Xen).

  If unsure, say M.

config VIRTIO_PCI_LEGACY bool "Support for legacy virtio draft 0.9.X and older devices" default y depends on VIRTIO_PCI select VIRTIO_PCI_LIB_LEGACY help Virtio PCI Card 0.9.X Draft (circa 2014) and older device support.

  This option enables building a transitional driver, supporting
  both devices conforming to Virtio 1 specification, and legacy devices.
  If disabled, you get a slightly smaller, non-transitional driver,
  with no legacy compatibility.

      So look out into your driveway.  Do you have a flying car?  If
      so, you can happily disable this option and virtio will not
      break.  Otherwise, leave it set.  Unless you're testing what
      life will be like in The Future.

  If unsure, say Y.

config VIRTIO_VDPA tristate "vDPA driver for virtio devices" depends on VDPA select VIRTIO help This driver provides support for virtio based paravirtual device driver over vDPA bus. For this to be useful, you need an appropriate vDPA device implementation that operates on a physical device to allow the datapath of virtio to be offloaded to hardware.

  If unsure, say M.

config VIRTIO_PMEM tristate "Support for virtio pmem driver" depends on VIRTIO depends on LIBNVDIMM help This driver provides access to virtio-pmem devices, storage devices that are mapped into the physical address space - similar to NVDIMMs - with a virtio-based flushing interface.

  If unsure, say Y.

config VIRTIO_BALLOON tristate "Virtio balloon driver" depends on VIRTIO select MEMORY_BALLOON select PAGE_REPORTING help This driver supports increasing and decreasing the amount of memory within a KVM guest.

 If unsure, say M.

config VIRTIO_MEM tristate "Virtio mem driver" depends on X86_64 || ARM64 depends on VIRTIO depends on MEMORY_HOTPLUG depends on MEMORY_HOTREMOVE depends on CONTIG_ALLOC depends on EXCLUSIVE_SYSTEM_RAM help This driver provides access to virtio-mem paravirtualized memory devices, allowing to hotplug and hotunplug memory.

 This driver currently only supports x86-64 and arm64. Although it
 should compile on other architectures that implement memory
 hot(un)plug, architecture-specific and/or common
 code changes may be required for virtio-mem, kdump and kexec to work as
 expected.

 If unsure, say M.

config VIRTIO_INPUT tristate "Virtio input driver" depends on VIRTIO depends on INPUT help This driver supports virtio input devices such as keyboards, mice and tablets.

 If unsure, say M.

config VIRTIO_MMIO tristate "Platform bus driver for memory mapped virtio devices" depends on HAS_IOMEM && HAS_DMA select VIRTIO help This drivers provides support for memory mapped virtio platform device driver.

 If unsure, say N.

config VIRTIO_MMIO_CMDLINE_DEVICES bool "Memory mapped virtio devices parameter parsing" depends on VIRTIO_MMIO help Allow virtio-mmio devices instantiation via the kernel command line or module parameters. Be aware that using incorrect parameters (base address in particular) can crash your system - you have been warned. See Documentation/admin-guide/kernel-parameters.rst for details.

 If unsure, say 'N'.

config VIRTIO_DMA_SHARED_BUFFER tristate depends on DMA_SHARED_BUFFER help This option adds a flavor of dma buffers that are backed by virtio resources.

endif # VIRTIO_MENU