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vhost.h
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/* 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> #define VHOST_FILE_UNBIND -1 /* 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) /* By default, a device gets one vhost_worker that its virtqueues share. This * command allows the owner of the device to create an additional vhost_worker * for the device. It can later be bound to 1 or more of its virtqueues using * the VHOST_ATTACH_VRING_WORKER command. * * This must be called after VHOST_SET_OWNER and the caller must be the owner * of the device. The new thread will inherit caller's cgroups and namespaces, * and will share the caller's memory space. The new thread will also be * counted against the caller's RLIMIT_NPROC value. * * The worker's ID used in other commands will be returned in * vhost_worker_state. */ #define VHOST_NEW_WORKER _IOR(VHOST_VIRTIO, 0x8, struct vhost_worker_state) /* Free a worker created with VHOST_NEW_WORKER if it's not attached to any * virtqueue. If userspace is not able to call this for workers its created, * the kernel will free all the device's workers when the device is closed. */ #define VHOST_FREE_WORKER _IOW(VHOST_VIRTIO, 0x9, struct vhost_worker_state) /* 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) /* Attach a vhost_worker created with VHOST_NEW_WORKER to one of the device's * virtqueues. * * This will replace the virtqueue's existing worker. If the replaced worker * is no longer attached to any virtqueues, it can be freed with * VHOST_FREE_WORKER. */ #define VHOST_ATTACH_VRING_WORKER _IOW(VHOST_VIRTIO, 0x15, \ struct vhost_vring_worker) /* Return the vring worker's ID */ #define VHOST_GET_VRING_WORKER _IOWR(VHOST_VIRTIO, 0x16, \ struct vhost_vring_worker) /* 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 */ #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) /* VHOST_VDPA specific defines */ /* Get the device id. The device ids follow the same definition of * the device id defined in virtio-spec. */ #define VHOST_VDPA_GET_DEVICE_ID _IOR(VHOST_VIRTIO, 0x70, __u32) /* Get and set the status. The status bits follow the same definition * of the device status defined in virtio-spec. */ #define VHOST_VDPA_GET_STATUS _IOR(VHOST_VIRTIO, 0x71, __u8) #define VHOST_VDPA_SET_STATUS _IOW(VHOST_VIRTIO, 0x72, __u8) /* Get and set the device config. The device config follows the same * definition of the device config defined in virtio-spec. */ #define VHOST_VDPA_GET_CONFIG _IOR(VHOST_VIRTIO, 0x73, \ struct vhost_vdpa_config) #define VHOST_VDPA_SET_CONFIG _IOW(VHOST_VIRTIO, 0x74, \ struct vhost_vdpa_config) /* Enable/disable the ring. */ #define VHOST_VDPA_SET_VRING_ENABLE _IOW(VHOST_VIRTIO, 0x75, \ struct vhost_vring_state) /* Get the max ring size. */ #define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16) /* Set event fd for config interrupt*/ #define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int) /* Get the valid iova range */ #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ struct vhost_vdpa_iova_range) /* Get the config size */ #define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32) /* Get the count of all virtqueues */ #define VHOST_VDPA_GET_VQS_COUNT _IOR(VHOST_VIRTIO, 0x80, __u32) /* Get the number of virtqueue groups. */ #define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x81, __u32) /* Get the number of address spaces. */ #define VHOST_VDPA_GET_AS_NUM _IOR(VHOST_VIRTIO, 0x7A, unsigned int) /* Get the group for a virtqueue: read index, write group in num, * The virtqueue index is stored in the index field of * vhost_vring_state. The group for this specific virtqueue is * returned via num field of vhost_vring_state. */ #define VHOST_VDPA_GET_VRING_GROUP _IOWR(VHOST_VIRTIO, 0x7B, \ struct vhost_vring_state) /* Set the ASID for a virtqueue group. The group index is stored in * the index field of vhost_vring_state, the ASID associated with this * group is stored at num field of vhost_vring_state. */ #define VHOST_VDPA_SET_GROUP_ASID _IOW(VHOST_VIRTIO, 0x7C, \ struct vhost_vring_state) /* Suspend a device so it does not process virtqueue requests anymore * * After the return of ioctl the device must preserve all the necessary state * (the virtqueue vring base plus the possible device specific states) that is * required for restoring in the future. The device must not change its * configuration after that point. */ #define VHOST_VDPA_SUSPEND _IO(VHOST_VIRTIO, 0x7D) /* Resume a device so it can resume processing virtqueue requests * * After the return of this ioctl the device will have restored all the * necessary states and it is fully operational to continue processing the * virtqueue descriptors. */ #define VHOST_VDPA_RESUME _IO(VHOST_VIRTIO, 0x7E) /* Get the group for the descriptor table including driver & device areas * of a virtqueue: read index, write group in num. * The virtqueue index is stored in the index field of vhost_vring_state. * The group ID of the descriptor table for this specific virtqueue * is returned via num field of vhost_vring_state. */ #define VHOST_VDPA_GET_VRING_DESC_GROUP _IOWR(VHOST_VIRTIO, 0x7F, \ struct vhost_vring_state) /* fork_owner values for vhost */ #define VHOST_FORK_OWNER_KTHREAD 0 #define VHOST_FORK_OWNER_TASK 1 /** * VHOST_SET_FORK_FROM_OWNER - Set the fork_owner flag for the vhost device, * This ioctl must called before VHOST_SET_OWNER. * Only available when CONFIG_VHOST_ENABLE_FORK_OWNER_CONTROL=y * * @param fork_owner: An 8-bit value that determines the vhost thread mode * * When fork_owner is set to VHOST_FORK_OWNER_TASK(default value): * - Vhost will create vhost worker as tasks forked from the owner, * inheriting all of the owner's attributes. * * When fork_owner is set to VHOST_FORK_OWNER_KTHREAD: * - Vhost will create vhost workers as kernel threads. */ #define VHOST_SET_FORK_FROM_OWNER _IOW(VHOST_VIRTIO, 0x84, __u8) /** * VHOST_GET_FORK_OWNER - Get the current fork_owner flag for the vhost device. * Only available when CONFIG_VHOST_ENABLE_FORK_OWNER_CONTROL=y * * @return: An 8-bit value indicating the current thread mode. */ #define VHOST_GET_FORK_FROM_OWNER _IOR(VHOST_VIRTIO, 0x85, __u8) #endif