vhost.h (6418B)
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