LXR linux/tools/include/uapi/linux/vhost.h

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2#ifndef _LINUX_VHOST_H
   3#define _LINUX_VHOST_H
   4/* Userspace interface for in-kernel virtio accelerators. */
   5
   6/* vhost is used to reduce the number of system calls involved in virtio.
   7 *
   8 * Existing virtio net code is used in the guest without modification.
   9 *
  10 * This header includes interface used by userspace hypervisor for
  11 * device configuration.
  12 */
  13
  14#include <linux/vhost_types.h>
  15#include <linux/types.h>
  16#include <linux/ioctl.h>
  17
  18#define VHOST_FILE_UNBIND -1
  19
  20/* ioctls */
  21
  22#define VHOST_VIRTIO 0xAF
  23
  24/* Features bitmask for forward compatibility.  Transport bits are used for
  25 * vhost specific features. */
  26#define VHOST_GET_FEATURES      _IOR(VHOST_VIRTIO, 0x00, __u64)
  27#define VHOST_SET_FEATURES      _IOW(VHOST_VIRTIO, 0x00, __u64)
  28
  29/* Set current process as the (exclusive) owner of this file descriptor.  This
  30 * must be called before any other vhost command.  Further calls to
  31 * VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */
  32#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
  33/* Give up ownership, and reset the device to default values.
  34 * Allows subsequent call to VHOST_OWNER_SET to succeed. */
  35#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
  36
  37/* Set up/modify memory layout */
  38#define VHOST_SET_MEM_TABLE     _IOW(VHOST_VIRTIO, 0x03, struct vhost_memory)
  39
  40/* Write logging setup. */
  41/* Memory writes can optionally be logged by setting bit at an offset
  42 * (calculated from the physical address) from specified log base.
  43 * The bit is set using an atomic 32 bit operation. */
  44/* Set base address for logging. */
  45#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
  46/* Specify an eventfd file descriptor to signal on log write. */
  47#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)
  48
  49/* Ring setup. */
  50/* Set number of descriptors in ring. This parameter can not
  51 * be modified while ring is running (bound to a device). */
  52#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
  53/* Set addresses for the ring. */
  54#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
  55/* Base value where queue looks for available descriptors */
  56#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
  57/* Get accessor: reads index, writes value in num */
  58#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
  59
  60/* Set the vring byte order in num. Valid values are VHOST_VRING_LITTLE_ENDIAN
  61 * or VHOST_VRING_BIG_ENDIAN (other values return -EINVAL).
  62 * The byte order cannot be changed while the device is active: trying to do so
  63 * returns -EBUSY.
  64 * This is a legacy only API that is simply ignored when VIRTIO_F_VERSION_1 is
  65 * set.
  66 * Not all kernel configurations support this ioctl, but all configurations that
  67 * support SET also support GET.
  68 */
  69#define VHOST_VRING_LITTLE_ENDIAN 0
  70#define VHOST_VRING_BIG_ENDIAN 1
  71#define VHOST_SET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x13, struct vhost_vring_state)
  72#define VHOST_GET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x14, struct vhost_vring_state)
  73
  74/* The following ioctls use eventfd file descriptors to signal and poll
  75 * for events. */
  76
  77/* Set eventfd to poll for added buffers */
  78#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
  79/* Set eventfd to signal when buffers have beed used */
  80#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
  81/* Set eventfd to signal an error */
  82#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
  83/* Set busy loop timeout (in us) */
  84#define VHOST_SET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x23,       \
  85                                         struct vhost_vring_state)
  86/* Get busy loop timeout (in us) */
  87#define VHOST_GET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x24,       \
  88                                         struct vhost_vring_state)
  89
  90/* Set or get vhost backend capability */
  91
  92/* Use message type V2 */
  93#define VHOST_BACKEND_F_IOTLB_MSG_V2 0x1
  94/* IOTLB can accept batching hints */
  95#define VHOST_BACKEND_F_IOTLB_BATCH  0x2
  96
  97#define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)
  98#define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64)
  99
 100/* VHOST_NET specific defines */
 101
 102/* Attach virtio net ring to a raw socket, or tap device.
 103 * The socket must be already bound to an ethernet device, this device will be
 104 * used for transmit.  Pass fd -1 to unbind from the socket and the transmit
 105 * device.  This can be used to stop the ring (e.g. for migration). */
 106#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
 107
 108/* VHOST_SCSI specific defines */
 109
 110#define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
 111#define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
 112/* Changing this breaks userspace. */
 113#define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
 114/* Set and get the events missed flag */
 115#define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)
 116#define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32)
 117
 118/* VHOST_VSOCK specific defines */
 119
 120#define VHOST_VSOCK_SET_GUEST_CID       _IOW(VHOST_VIRTIO, 0x60, __u64)
 121#define VHOST_VSOCK_SET_RUNNING         _IOW(VHOST_VIRTIO, 0x61, int)
 122
 123/* VHOST_VDPA specific defines */
 124
 125/* Get the device id. The device ids follow the same definition of
 126 * the device id defined in virtio-spec.
 127 */
 128#define VHOST_VDPA_GET_DEVICE_ID        _IOR(VHOST_VIRTIO, 0x70, __u32)
 129/* Get and set the status. The status bits follow the same definition
 130 * of the device status defined in virtio-spec.
 131 */
 132#define VHOST_VDPA_GET_STATUS           _IOR(VHOST_VIRTIO, 0x71, __u8)
 133#define VHOST_VDPA_SET_STATUS           _IOW(VHOST_VIRTIO, 0x72, __u8)
 134/* Get and set the device config. The device config follows the same
 135 * definition of the device config defined in virtio-spec.
 136 */
 137#define VHOST_VDPA_GET_CONFIG           _IOR(VHOST_VIRTIO, 0x73, \
 138                                             struct vhost_vdpa_config)
 139#define VHOST_VDPA_SET_CONFIG           _IOW(VHOST_VIRTIO, 0x74, \
 140                                             struct vhost_vdpa_config)
 141/* Enable/disable the ring. */
 142#define VHOST_VDPA_SET_VRING_ENABLE     _IOW(VHOST_VIRTIO, 0x75, \
 143                                             struct vhost_vring_state)
 144/* Get the max ring size. */
 145#define VHOST_VDPA_GET_VRING_NUM        _IOR(VHOST_VIRTIO, 0x76, __u16)
 146
 147/* Set event fd for config interrupt*/
 148#define VHOST_VDPA_SET_CONFIG_CALL      _IOW(VHOST_VIRTIO, 0x77, int)
 149
 150/* Get the valid iova range */
 151#define VHOST_VDPA_GET_IOVA_RANGE       _IOR(VHOST_VIRTIO, 0x78, \
 152                                             struct vhost_vdpa_iova_range)
 153#endif
 154