linux-headers/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
  95 #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)
  96 #define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64)
  97
  98 /* VHOST_NET specific defines */
  99
 100 /* Attach virtio net ring to a raw socket, or tap device.
 101  * The socket must be already bound to an ethernet device, this device will be
 102  * used for transmit.  Pass fd -1 to unbind from the socket and the transmit
 103  * device.  This can be used to stop the ring (e.g. for migration). */
 104 #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
 105
 106 /* VHOST_SCSI specific defines */
 107
 108 #define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
 109 #define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
 110 /* Changing this breaks userspace. */
 111 #define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
 112 /* Set and get the events missed flag */
 113 #define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)
 114 #define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32)
 115
 116 /* VHOST_VSOCK specific defines */
 117
 118 #define VHOST_VSOCK_SET_GUEST_CID       _IOW(VHOST_VIRTIO, 0x60, __u64)
 119 #define VHOST_VSOCK_SET_RUNNING         _IOW(VHOST_VIRTIO, 0x61, int)
 120
 121 /* VHOST_VDPA specific defines */
 122
 123 /* Get the device id. The device ids follow the same definition of
 124  * the device id defined in virtio-spec.
 125  */
 126 #define VHOST_VDPA_GET_DEVICE_ID        _IOR(VHOST_VIRTIO, 0x70, __u32)
 127 /* Get and set the status. The status bits follow the same definition
 128  * of the device status defined in virtio-spec.
 129  */
 130 #define VHOST_VDPA_GET_STATUS           _IOR(VHOST_VIRTIO, 0x71, __u8)
 131 #define VHOST_VDPA_SET_STATUS           _IOW(VHOST_VIRTIO, 0x72, __u8)
 132 /* Get and set the device config. The device config follows the same
 133  * definition of the device config defined in virtio-spec.
 134  */
 135 #define VHOST_VDPA_GET_CONFIG           _IOR(VHOST_VIRTIO, 0x73, \
 136                                              struct vhost_vdpa_config)
 137 #define VHOST_VDPA_SET_CONFIG           _IOW(VHOST_VIRTIO, 0x74, \
 138                                              struct vhost_vdpa_config)
 139 /* Enable/disable the ring. */
 140 #define VHOST_VDPA_SET_VRING_ENABLE     _IOW(VHOST_VIRTIO, 0x75, \
 141                                              struct vhost_vring_state)
 142 /* Get the max ring size. */
 143 #define VHOST_VDPA_GET_VRING_NUM        _IOR(VHOST_VIRTIO, 0x76, __u16)
 144
 145 /* Set event fd for config interrupt*/
 146 #define VHOST_VDPA_SET_CONFIG_CALL      _IOW(VHOST_VIRTIO, 0x77, int)
 147 #endif