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 /* By default, a device gets one vhost_worker that its virtqueues share. This 49 * command allows the owner of the device to create an additional vhost_worker 50 * for the device. It can later be bound to 1 or more of its virtqueues using 51 * the VHOST_ATTACH_VRING_WORKER command. 52 * 53 * This must be called after VHOST_SET_OWNER and the caller must be the owner 54 * of the device. The new thread will inherit caller's cgroups and namespaces, 55 * and will share the caller's memory space. The new thread will also be 56 * counted against the caller's RLIMIT_NPROC value. 57 * 58 * The worker's ID used in other commands will be returned in 59 * vhost_worker_state. 60 */ 61 #define VHOST_NEW_WORKER _IOR(VHOST_VIRTIO, 0x8, struct vhost_worker_state) 62 /* Free a worker created with VHOST_NEW_WORKER if it's not attached to any 63 * virtqueue. If userspace is not able to call this for workers its created, 64 * the kernel will free all the device's workers when the device is closed. 65 */ 66 #define VHOST_FREE_WORKER _IOW(VHOST_VIRTIO, 0x9, struct vhost_worker_state) 67 68 /* Ring setup. */ 69 /* Set number of descriptors in ring. This parameter can not 70 * be modified while ring is running (bound to a device). */ 71 #define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state) 72 /* Set addresses for the ring. */ 73 #define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr) 74 /* Base value where queue looks for available descriptors */ 75 #define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state) 76 /* Get accessor: reads index, writes value in num */ 77 #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) 78 79 /* Set the vring byte order in num. Valid values are VHOST_VRING_LITTLE_ENDIAN 80 * or VHOST_VRING_BIG_ENDIAN (other values return -EINVAL). 81 * The byte order cannot be changed while the device is active: trying to do so 82 * returns -EBUSY. 83 * This is a legacy only API that is simply ignored when VIRTIO_F_VERSION_1 is 84 * set. 85 * Not all kernel configurations support this ioctl, but all configurations that 86 * support SET also support GET. 87 */ 88 #define VHOST_VRING_LITTLE_ENDIAN 0 89 #define VHOST_VRING_BIG_ENDIAN 1 90 #define VHOST_SET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x13, struct vhost_vring_state) 91 #define VHOST_GET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x14, struct vhost_vring_state) 92 /* Attach a vhost_worker created with VHOST_NEW_WORKER to one of the device's 93 * virtqueues. 94 * 95 * This will replace the virtqueue's existing worker. If the replaced worker 96 * is no longer attached to any virtqueues, it can be freed with 97 * VHOST_FREE_WORKER. 98 */ 99 #define VHOST_ATTACH_VRING_WORKER _IOW(VHOST_VIRTIO, 0x15, \ 100 struct vhost_vring_worker) 101 /* Return the vring worker's ID */ 102 #define VHOST_GET_VRING_WORKER _IOWR(VHOST_VIRTIO, 0x16, \ 103 struct vhost_vring_worker) 104 105 /* The following ioctls use eventfd file descriptors to signal and poll 106 * for events. */ 107 108 /* Set eventfd to poll for added buffers */ 109 #define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file) 110 /* Set eventfd to signal when buffers have beed used */ 111 #define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file) 112 /* Set eventfd to signal an error */ 113 #define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file) 114 /* Set busy loop timeout (in us) */ 115 #define VHOST_SET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x23, \ 116 struct vhost_vring_state) 117 /* Get busy loop timeout (in us) */ 118 #define VHOST_GET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x24, \ 119 struct vhost_vring_state) 120 121 /* Set or get vhost backend capability */ 122 123 #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64) 124 #define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64) 125 126 /* VHOST_NET specific defines */ 127 128 /* Attach virtio net ring to a raw socket, or tap device. 129 * The socket must be already bound to an ethernet device, this device will be 130 * used for transmit. Pass fd -1 to unbind from the socket and the transmit 131 * device. This can be used to stop the ring (e.g. for migration). */ 132 #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file) 133 134 /* VHOST_SCSI specific defines */ 135 136 #define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target) 137 #define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target) 138 /* Changing this breaks userspace. */ 139 #define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int) 140 /* Set and get the events missed flag */ 141 #define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32) 142 #define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32) 143 144 /* VHOST_VSOCK specific defines */ 145 146 #define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u64) 147 #define VHOST_VSOCK_SET_RUNNING _IOW(VHOST_VIRTIO, 0x61, int) 148 149 /* VHOST_VDPA specific defines */ 150 151 /* Get the device id. The device ids follow the same definition of 152 * the device id defined in virtio-spec. 153 */ 154 #define VHOST_VDPA_GET_DEVICE_ID _IOR(VHOST_VIRTIO, 0x70, __u32) 155 /* Get and set the status. The status bits follow the same definition 156 * of the device status defined in virtio-spec. 157 */ 158 #define VHOST_VDPA_GET_STATUS _IOR(VHOST_VIRTIO, 0x71, __u8) 159 #define VHOST_VDPA_SET_STATUS _IOW(VHOST_VIRTIO, 0x72, __u8) 160 /* Get and set the device config. The device config follows the same 161 * definition of the device config defined in virtio-spec. 162 */ 163 #define VHOST_VDPA_GET_CONFIG _IOR(VHOST_VIRTIO, 0x73, \ 164 struct vhost_vdpa_config) 165 #define VHOST_VDPA_SET_CONFIG _IOW(VHOST_VIRTIO, 0x74, \ 166 struct vhost_vdpa_config) 167 /* Enable/disable the ring. */ 168 #define VHOST_VDPA_SET_VRING_ENABLE _IOW(VHOST_VIRTIO, 0x75, \ 169 struct vhost_vring_state) 170 /* Get the max ring size. */ 171 #define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16) 172 173 /* Set event fd for config interrupt*/ 174 #define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int) 175 176 /* Get the valid iova range */ 177 #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ 178 struct vhost_vdpa_iova_range) 179 /* Get the config size */ 180 #define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32) 181 182 /* Get the count of all virtqueues */ 183 #define VHOST_VDPA_GET_VQS_COUNT _IOR(VHOST_VIRTIO, 0x80, __u32) 184 185 /* Get the number of virtqueue groups. */ 186 #define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x81, __u32) 187 188 /* Get the number of address spaces. */ 189 #define VHOST_VDPA_GET_AS_NUM _IOR(VHOST_VIRTIO, 0x7A, unsigned int) 190 191 /* Get the group for a virtqueue: read index, write group in num, 192 * The virtqueue index is stored in the index field of 193 * vhost_vring_state. The group for this specific virtqueue is 194 * returned via num field of vhost_vring_state. 195 */ 196 #define VHOST_VDPA_GET_VRING_GROUP _IOWR(VHOST_VIRTIO, 0x7B, \ 197 struct vhost_vring_state) 198 /* Set the ASID for a virtqueue group. The group index is stored in 199 * the index field of vhost_vring_state, the ASID associated with this 200 * group is stored at num field of vhost_vring_state. 201 */ 202 #define VHOST_VDPA_SET_GROUP_ASID _IOW(VHOST_VIRTIO, 0x7C, \ 203 struct vhost_vring_state) 204 205 /* Suspend a device so it does not process virtqueue requests anymore 206 * 207 * After the return of ioctl the device must preserve all the necessary state 208 * (the virtqueue vring base plus the possible device specific states) that is 209 * required for restoring in the future. The device must not change its 210 * configuration after that point. 211 */ 212 #define VHOST_VDPA_SUSPEND _IO(VHOST_VIRTIO, 0x7D) 213 214 /* Resume a device so it can resume processing virtqueue requests 215 * 216 * After the return of this ioctl the device will have restored all the 217 * necessary states and it is fully operational to continue processing the 218 * virtqueue descriptors. 219 */ 220 #define VHOST_VDPA_RESUME _IO(VHOST_VIRTIO, 0x7E) 221 222 #endif 223