/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */#ifndef _LINUX_VHOST_H#define _LINUX_VHOST_H/* Userspace interface for in-kernel virtio accelerators. */ /* vhost is used to reduce the number of system calls involved in virtio. * * Existing virtio net code is used in the guest without modification. * * This header includes interface used by userspace hypervisor for * device configuration. */ #include <linux/vhost_types.h>#include <linux/types.h>#include <linux/ioctl.h> /* ioctls */ #define VHOST_VIRTIO 0xAF /* Features bitmask for forward compatibility.  Transport bits are used for * vhost specific features. */#define VHOST_GET_FEATURES	_IOR(VHOST_VIRTIO, 0x00, __u64)#define VHOST_SET_FEATURES	_IOW(VHOST_VIRTIO, 0x00, __u64) /* Set current process as the (exclusive) owner of this file descriptor.  This * must be called before any other vhost command.  Further calls to * VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)/* Give up ownership, and reset the device to default values. * Allows subsequent call to VHOST_OWNER_SET to succeed. */#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02) /* Set up/modify memory layout */#define VHOST_SET_MEM_TABLE	_IOW(VHOST_VIRTIO, 0x03, struct vhost_memory) /* Write logging setup. *//* Memory writes can optionally be logged by setting bit at an offset * (calculated from the physical address) from specified log base. * The bit is set using an atomic 32 bit operation. *//* Set base address for logging. */#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)/* Specify an eventfd file descriptor to signal on log write. */#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int) /* Ring setup. *//* Set number of descriptors in ring. This parameter can not * be modified while ring is running (bound to a device). */#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)/* Set addresses for the ring. */#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)/* Base value where queue looks for available descriptors */#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)/* Get accessor: reads index, writes value in num */#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) /* Set the vring byte order in num. Valid values are VHOST_VRING_LITTLE_ENDIAN * or VHOST_VRING_BIG_ENDIAN (other values return -EINVAL). * The byte order cannot be changed while the device is active: trying to do so * returns -EBUSY. * This is a legacy only API that is simply ignored when VIRTIO_F_VERSION_1 is * set. * Not all kernel configurations support this ioctl, but all configurations that * support SET also support GET. */#define VHOST_VRING_LITTLE_ENDIAN 0#define VHOST_VRING_BIG_ENDIAN 1#define VHOST_SET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x13, struct vhost_vring_state)#define VHOST_GET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x14, struct vhost_vring_state) /* The following ioctls use eventfd file descriptors to signal and poll * for events. */ /* Set eventfd to poll for added buffers */#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)/* Set eventfd to signal when buffers have beed used */#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)/* Set eventfd to signal an error */#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)/* Set busy loop timeout (in us) */#define VHOST_SET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x23,	\					 struct vhost_vring_state)/* Get busy loop timeout (in us) */#define VHOST_GET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x24,	\					 struct vhost_vring_state) /* Set or get vhost backend capability */ /* Use message type V2 */#define VHOST_BACKEND_F_IOTLB_MSG_V2 0x1 #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)#define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64) /* VHOST_NET specific defines */ /* Attach virtio net ring to a raw socket, or tap device. * The socket must be already bound to an ethernet device, this device will be * used for transmit.  Pass fd -1 to unbind from the socket and the transmit * device.  This can be used to stop the ring (e.g. for migration). */#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file) /* VHOST_SCSI specific defines */ #define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)#define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)/* Changing this breaks userspace. */#define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)/* Set and get the events missed flag */#define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)#define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32) /* VHOST_VSOCK specific defines */ #define VHOST_VSOCK_SET_GUEST_CID	_IOW(VHOST_VIRTIO, 0x60, __u64)#define VHOST_VSOCK_SET_RUNNING		_IOW(VHOST_VIRTIO, 0x61, int) #endif