vhost.h (7713B)
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 #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64) 93 #define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64) 94 95 /* VHOST_NET specific defines */ 96 97 /* Attach virtio net ring to a raw socket, or tap device. 98 * The socket must be already bound to an ethernet device, this device will be 99 * used for transmit. Pass fd -1 to unbind from the socket and the transmit 100 * device. This can be used to stop the ring (e.g. for migration). */ 101 #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file) 102 103 /* VHOST_SCSI specific defines */ 104 105 #define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target) 106 #define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target) 107 /* Changing this breaks userspace. */ 108 #define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int) 109 /* Set and get the events missed flag */ 110 #define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32) 111 #define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32) 112 113 /* VHOST_VSOCK specific defines */ 114 115 #define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u64) 116 #define VHOST_VSOCK_SET_RUNNING _IOW(VHOST_VIRTIO, 0x61, int) 117 118 /* VHOST_VDPA specific defines */ 119 120 /* Get the device id. The device ids follow the same definition of 121 * the device id defined in virtio-spec. 122 */ 123 #define VHOST_VDPA_GET_DEVICE_ID _IOR(VHOST_VIRTIO, 0x70, __u32) 124 /* Get and set the status. The status bits follow the same definition 125 * of the device status defined in virtio-spec. 126 */ 127 #define VHOST_VDPA_GET_STATUS _IOR(VHOST_VIRTIO, 0x71, __u8) 128 #define VHOST_VDPA_SET_STATUS _IOW(VHOST_VIRTIO, 0x72, __u8) 129 /* Get and set the device config. The device config follows the same 130 * definition of the device config defined in virtio-spec. 131 */ 132 #define VHOST_VDPA_GET_CONFIG _IOR(VHOST_VIRTIO, 0x73, \ 133 struct vhost_vdpa_config) 134 #define VHOST_VDPA_SET_CONFIG _IOW(VHOST_VIRTIO, 0x74, \ 135 struct vhost_vdpa_config) 136 /* Enable/disable the ring. */ 137 #define VHOST_VDPA_SET_VRING_ENABLE _IOW(VHOST_VIRTIO, 0x75, \ 138 struct vhost_vring_state) 139 /* Get the max ring size. */ 140 #define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16) 141 142 /* Set event fd for config interrupt*/ 143 #define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int) 144 145 /* Get the valid iova range */ 146 #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ 147 struct vhost_vdpa_iova_range) 148 /* Get the config size */ 149 #define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32) 150 151 /* Get the count of all virtqueues */ 152 #define VHOST_VDPA_GET_VQS_COUNT _IOR(VHOST_VIRTIO, 0x80, __u32) 153 154 /* Get the number of virtqueue groups. */ 155 #define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x81, __u32) 156 157 /* Get the number of address spaces. */ 158 #define VHOST_VDPA_GET_AS_NUM _IOR(VHOST_VIRTIO, 0x7A, unsigned int) 159 160 /* Get the group for a virtqueue: read index, write group in num, 161 * The virtqueue index is stored in the index field of 162 * vhost_vring_state. The group for this specific virtqueue is 163 * returned via num field of vhost_vring_state. 164 */ 165 #define VHOST_VDPA_GET_VRING_GROUP _IOWR(VHOST_VIRTIO, 0x7B, \ 166 struct vhost_vring_state) 167 /* Set the ASID for a virtqueue group. The group index is stored in 168 * the index field of vhost_vring_state, the ASID associated with this 169 * group is stored at num field of vhost_vring_state. 170 */ 171 #define VHOST_VDPA_SET_GROUP_ASID _IOW(VHOST_VIRTIO, 0x7C, \ 172 struct vhost_vring_state) 173 174 /* Suspend a device so it does not process virtqueue requests anymore 175 * 176 * After the return of ioctl the device must preserve all the necessary state 177 * (the virtqueue vring base plus the possible device specific states) that is 178 * required for restoring in the future. The device must not change its 179 * configuration after that point. 180 */ 181 #define VHOST_VDPA_SUSPEND _IO(VHOST_VIRTIO, 0x7D) 182 183 #endif