238 lines
10 KiB
C
238 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _LINUX_VHOST_H
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#define _LINUX_VHOST_H
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/* Userspace interface for in-kernel virtio accelerators. */
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/* vhost is used to reduce the number of system calls involved in virtio.
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*
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* Existing virtio net code is used in the guest without modification.
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*
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* This header includes interface used by userspace hypervisor for
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* device configuration.
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*/
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#include <linux/vhost_types.h>
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#define VHOST_FILE_UNBIND -1
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/* ioctls */
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#define VHOST_VIRTIO 0xAF
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/* Features bitmask for forward compatibility. Transport bits are used for
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* vhost specific features. */
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#define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64)
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#define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64)
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/* Set current process as the (exclusive) owner of this file descriptor. This
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* must be called before any other vhost command. Further calls to
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* VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */
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#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
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/* Give up ownership, and reset the device to default values.
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* Allows subsequent call to VHOST_OWNER_SET to succeed. */
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#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
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/* Set up/modify memory layout */
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#define VHOST_SET_MEM_TABLE _IOW(VHOST_VIRTIO, 0x03, struct vhost_memory)
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/* Write logging setup. */
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/* Memory writes can optionally be logged by setting bit at an offset
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* (calculated from the physical address) from specified log base.
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* The bit is set using an atomic 32 bit operation. */
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/* Set base address for logging. */
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#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
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/* Specify an eventfd file descriptor to signal on log write. */
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#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)
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/* By default, a device gets one vhost_worker that its virtqueues share. This
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* command allows the owner of the device to create an additional vhost_worker
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* for the device. It can later be bound to 1 or more of its virtqueues using
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* the VHOST_ATTACH_VRING_WORKER command.
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*
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* This must be called after VHOST_SET_OWNER and the caller must be the owner
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* of the device. The new thread will inherit caller's cgroups and namespaces,
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* and will share the caller's memory space. The new thread will also be
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* counted against the caller's RLIMIT_NPROC value.
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*
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* The worker's ID used in other commands will be returned in
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* vhost_worker_state.
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*/
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#define VHOST_NEW_WORKER _IOR(VHOST_VIRTIO, 0x8, struct vhost_worker_state)
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/* Free a worker created with VHOST_NEW_WORKER if it's not attached to any
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* virtqueue. If userspace is not able to call this for workers its created,
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* the kernel will free all the device's workers when the device is closed.
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*/
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#define VHOST_FREE_WORKER _IOW(VHOST_VIRTIO, 0x9, struct vhost_worker_state)
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/* Ring setup. */
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/* Set number of descriptors in ring. This parameter can not
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* be modified while ring is running (bound to a device). */
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#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
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/* Set addresses for the ring. */
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#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
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/* Base value where queue looks for available descriptors */
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#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
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/* Get accessor: reads index, writes value in num */
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#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
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/* Set the vring byte order in num. Valid values are VHOST_VRING_LITTLE_ENDIAN
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* or VHOST_VRING_BIG_ENDIAN (other values return -EINVAL).
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* The byte order cannot be changed while the device is active: trying to do so
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* returns -EBUSY.
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* This is a legacy only API that is simply ignored when VIRTIO_F_VERSION_1 is
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* set.
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* Not all kernel configurations support this ioctl, but all configurations that
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* support SET also support GET.
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*/
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#define VHOST_VRING_LITTLE_ENDIAN 0
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#define VHOST_VRING_BIG_ENDIAN 1
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#define VHOST_SET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x13, struct vhost_vring_state)
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#define VHOST_GET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x14, struct vhost_vring_state)
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/* Attach a vhost_worker created with VHOST_NEW_WORKER to one of the device's
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* virtqueues.
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*
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* This will replace the virtqueue's existing worker. If the replaced worker
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* is no longer attached to any virtqueues, it can be freed with
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* VHOST_FREE_WORKER.
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*/
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#define VHOST_ATTACH_VRING_WORKER _IOW(VHOST_VIRTIO, 0x15, \
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struct vhost_vring_worker)
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/* Return the vring worker's ID */
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#define VHOST_GET_VRING_WORKER _IOWR(VHOST_VIRTIO, 0x16, \
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struct vhost_vring_worker)
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/* The following ioctls use eventfd file descriptors to signal and poll
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* for events. */
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/* Set eventfd to poll for added buffers */
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#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
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/* Set eventfd to signal when buffers have beed used */
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#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
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/* Set eventfd to signal an error */
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#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
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/* Set busy loop timeout (in us) */
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#define VHOST_SET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x23, \
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struct vhost_vring_state)
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/* Get busy loop timeout (in us) */
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#define VHOST_GET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x24, \
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struct vhost_vring_state)
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/* Set or get vhost backend capability */
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#define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)
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#define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64)
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/* VHOST_NET specific defines */
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/* Attach virtio net ring to a raw socket, or tap device.
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* The socket must be already bound to an ethernet device, this device will be
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* used for transmit. Pass fd -1 to unbind from the socket and the transmit
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* device. This can be used to stop the ring (e.g. for migration). */
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#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
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/* VHOST_SCSI specific defines */
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#define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
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#define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
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/* Changing this breaks userspace. */
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#define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
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/* Set and get the events missed flag */
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#define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)
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#define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32)
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/* VHOST_VSOCK specific defines */
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#define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u64)
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#define VHOST_VSOCK_SET_RUNNING _IOW(VHOST_VIRTIO, 0x61, int)
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/* VHOST_VDPA specific defines */
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/* Get the device id. The device ids follow the same definition of
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* the device id defined in virtio-spec.
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*/
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#define VHOST_VDPA_GET_DEVICE_ID _IOR(VHOST_VIRTIO, 0x70, __u32)
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/* Get and set the status. The status bits follow the same definition
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* of the device status defined in virtio-spec.
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*/
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#define VHOST_VDPA_GET_STATUS _IOR(VHOST_VIRTIO, 0x71, __u8)
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#define VHOST_VDPA_SET_STATUS _IOW(VHOST_VIRTIO, 0x72, __u8)
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/* Get and set the device config. The device config follows the same
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* definition of the device config defined in virtio-spec.
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*/
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#define VHOST_VDPA_GET_CONFIG _IOR(VHOST_VIRTIO, 0x73, \
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struct vhost_vdpa_config)
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#define VHOST_VDPA_SET_CONFIG _IOW(VHOST_VIRTIO, 0x74, \
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struct vhost_vdpa_config)
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/* Enable/disable the ring. */
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#define VHOST_VDPA_SET_VRING_ENABLE _IOW(VHOST_VIRTIO, 0x75, \
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struct vhost_vring_state)
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/* Get the max ring size. */
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#define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16)
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/* Set event fd for config interrupt*/
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#define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int)
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/* Get the valid iova range */
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#define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \
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struct vhost_vdpa_iova_range)
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/* Get the config size */
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#define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32)
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/* Get the count of all virtqueues */
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#define VHOST_VDPA_GET_VQS_COUNT _IOR(VHOST_VIRTIO, 0x80, __u32)
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/* Get the number of virtqueue groups. */
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#define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x81, __u32)
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/* Get the number of address spaces. */
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#define VHOST_VDPA_GET_AS_NUM _IOR(VHOST_VIRTIO, 0x7A, unsigned int)
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/* Get the group for a virtqueue: read index, write group in num,
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* The virtqueue index is stored in the index field of
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* vhost_vring_state. The group for this specific virtqueue is
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* returned via num field of vhost_vring_state.
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*/
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#define VHOST_VDPA_GET_VRING_GROUP _IOWR(VHOST_VIRTIO, 0x7B, \
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struct vhost_vring_state)
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/* Set the ASID for a virtqueue group. The group index is stored in
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* the index field of vhost_vring_state, the ASID associated with this
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* group is stored at num field of vhost_vring_state.
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*/
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#define VHOST_VDPA_SET_GROUP_ASID _IOW(VHOST_VIRTIO, 0x7C, \
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struct vhost_vring_state)
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/* Suspend a device so it does not process virtqueue requests anymore
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*
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* After the return of ioctl the device must preserve all the necessary state
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* (the virtqueue vring base plus the possible device specific states) that is
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* required for restoring in the future. The device must not change its
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* configuration after that point.
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*/
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#define VHOST_VDPA_SUSPEND _IO(VHOST_VIRTIO, 0x7D)
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/* Resume a device so it can resume processing virtqueue requests
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*
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* After the return of this ioctl the device will have restored all the
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* necessary states and it is fully operational to continue processing the
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* virtqueue descriptors.
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*/
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#define VHOST_VDPA_RESUME _IO(VHOST_VIRTIO, 0x7E)
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/* Get the group for the descriptor table including driver & device areas
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* of a virtqueue: read index, write group in num.
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* The virtqueue index is stored in the index field of vhost_vring_state.
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* The group ID of the descriptor table for this specific virtqueue
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* is returned via num field of vhost_vring_state.
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*/
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#define VHOST_VDPA_GET_VRING_DESC_GROUP _IOWR(VHOST_VIRTIO, 0x7F, \
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struct vhost_vring_state)
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/* Get the queue size of a specific virtqueue.
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* userspace set the vring index in vhost_vring_state.index
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* kernel set the queue size in vhost_vring_state.num
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*/
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#define VHOST_VDPA_GET_VRING_SIZE _IOWR(VHOST_VIRTIO, 0x80, \
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struct vhost_vring_state)
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#endif
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