229 lines
7.5 KiB
C
229 lines
7.5 KiB
C
/* 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/types.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/ioctl.h>
|
|
#include <linux/virtio_config.h>
|
|
#include <linux/virtio_ring.h>
|
|
|
|
struct vhost_vring_state {
|
|
unsigned int index;
|
|
unsigned int num;
|
|
};
|
|
|
|
struct vhost_vring_file {
|
|
unsigned int index;
|
|
int fd; /* Pass -1 to unbind from file. */
|
|
|
|
};
|
|
|
|
struct vhost_vring_addr {
|
|
unsigned int index;
|
|
/* Option flags. */
|
|
unsigned int flags;
|
|
/* Flag values: */
|
|
/* Whether log address is valid. If set enables logging. */
|
|
#define VHOST_VRING_F_LOG 0
|
|
|
|
/* Start of array of descriptors (virtually contiguous) */
|
|
__u64 desc_user_addr;
|
|
/* Used structure address. Must be 32 bit aligned */
|
|
__u64 used_user_addr;
|
|
/* Available structure address. Must be 16 bit aligned */
|
|
__u64 avail_user_addr;
|
|
/* Logging support. */
|
|
/* Log writes to used structure, at offset calculated from specified
|
|
* address. Address must be 32 bit aligned. */
|
|
__u64 log_guest_addr;
|
|
};
|
|
|
|
/* no alignment requirement */
|
|
struct vhost_iotlb_msg {
|
|
__u64 iova;
|
|
__u64 size;
|
|
__u64 uaddr;
|
|
#define VHOST_ACCESS_RO 0x1
|
|
#define VHOST_ACCESS_WO 0x2
|
|
#define VHOST_ACCESS_RW 0x3
|
|
__u8 perm;
|
|
#define VHOST_IOTLB_MISS 1
|
|
#define VHOST_IOTLB_UPDATE 2
|
|
#define VHOST_IOTLB_INVALIDATE 3
|
|
#define VHOST_IOTLB_ACCESS_FAIL 4
|
|
__u8 type;
|
|
};
|
|
|
|
#define VHOST_IOTLB_MSG 0x1
|
|
#define VHOST_IOTLB_MSG_V2 0x2
|
|
|
|
struct vhost_msg {
|
|
int type;
|
|
union {
|
|
struct vhost_iotlb_msg iotlb;
|
|
__u8 padding[64];
|
|
};
|
|
};
|
|
|
|
struct vhost_msg_v2 {
|
|
__u32 type;
|
|
__u32 reserved;
|
|
union {
|
|
struct vhost_iotlb_msg iotlb;
|
|
__u8 padding[64];
|
|
};
|
|
};
|
|
|
|
struct vhost_memory_region {
|
|
__u64 guest_phys_addr;
|
|
__u64 memory_size; /* bytes */
|
|
__u64 userspace_addr;
|
|
__u64 flags_padding; /* No flags are currently specified. */
|
|
};
|
|
|
|
/* All region addresses and sizes must be 4K aligned. */
|
|
#define VHOST_PAGE_SIZE 0x1000
|
|
|
|
struct vhost_memory {
|
|
__u32 nregions;
|
|
__u32 padding;
|
|
struct vhost_memory_region regions[0];
|
|
};
|
|
|
|
/* 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)
|
|
|
|
/* Feature bits */
|
|
/* Log all write descriptors. Can be changed while device is active. */
|
|
#define VHOST_F_LOG_ALL 26
|
|
/* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */
|
|
#define VHOST_NET_F_VIRTIO_NET_HDR 27
|
|
|
|
/* VHOST_SCSI specific definitions */
|
|
|
|
/*
|
|
* Used by QEMU userspace to ensure a consistent vhost-scsi ABI.
|
|
*
|
|
* ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate +
|
|
* RFC-v2 vhost-scsi userspace. Add GET_ABI_VERSION ioctl usage
|
|
* ABI Rev 1: January 2013. Ignore vhost_tpgt filed in struct vhost_scsi_target.
|
|
* All the targets under vhost_wwpn can be seen and used by guset.
|
|
*/
|
|
|
|
#define VHOST_SCSI_ABI_VERSION 1
|
|
|
|
struct vhost_scsi_target {
|
|
int abi_version;
|
|
char vhost_wwpn[224]; /* TRANSPORT_IQN_LEN */
|
|
unsigned short vhost_tpgt;
|
|
unsigned short reserved;
|
|
};
|
|
|
|
#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
|