325 lines
9.3 KiB
C
325 lines
9.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _VHOST_H
|
|
#define _VHOST_H
|
|
|
|
#include <linux/eventfd.h>
|
|
#include <linux/vhost.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/file.h>
|
|
#include <linux/uio.h>
|
|
#include <linux/virtio_config.h>
|
|
#include <linux/virtio_ring.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/vhost_iotlb.h>
|
|
#include <linux/irqbypass.h>
|
|
|
|
struct vhost_work;
|
|
typedef void (*vhost_work_fn_t)(struct vhost_work *work);
|
|
|
|
#define VHOST_WORK_QUEUED 1
|
|
struct vhost_work {
|
|
struct llist_node node;
|
|
vhost_work_fn_t fn;
|
|
unsigned long flags;
|
|
};
|
|
|
|
/* Poll a file (eventfd or socket) */
|
|
/* Note: there's nothing vhost specific about this structure. */
|
|
struct vhost_poll {
|
|
poll_table table;
|
|
wait_queue_head_t *wqh;
|
|
wait_queue_entry_t wait;
|
|
struct vhost_work work;
|
|
__poll_t mask;
|
|
struct vhost_dev *dev;
|
|
};
|
|
|
|
void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
|
|
void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work);
|
|
bool vhost_has_work(struct vhost_dev *dev);
|
|
|
|
void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
|
|
__poll_t mask, struct vhost_dev *dev);
|
|
int vhost_poll_start(struct vhost_poll *poll, struct file *file);
|
|
void vhost_poll_stop(struct vhost_poll *poll);
|
|
void vhost_poll_flush(struct vhost_poll *poll);
|
|
void vhost_poll_queue(struct vhost_poll *poll);
|
|
void vhost_work_dev_flush(struct vhost_dev *dev);
|
|
|
|
struct vhost_log {
|
|
u64 addr;
|
|
u64 len;
|
|
};
|
|
|
|
enum vhost_uaddr_type {
|
|
VHOST_ADDR_DESC = 0,
|
|
VHOST_ADDR_AVAIL = 1,
|
|
VHOST_ADDR_USED = 2,
|
|
VHOST_NUM_ADDRS = 3,
|
|
};
|
|
|
|
struct vhost_vring_call {
|
|
struct eventfd_ctx *ctx;
|
|
struct irq_bypass_producer producer;
|
|
};
|
|
|
|
/* The virtqueue structure describes a queue attached to a device. */
|
|
struct vhost_virtqueue {
|
|
struct vhost_dev *dev;
|
|
|
|
/* The actual ring of buffers. */
|
|
struct mutex mutex;
|
|
unsigned int num;
|
|
vring_desc_t __user *desc;
|
|
vring_avail_t __user *avail;
|
|
vring_used_t __user *used;
|
|
const struct vhost_iotlb_map *meta_iotlb[VHOST_NUM_ADDRS];
|
|
struct file *kick;
|
|
struct vhost_vring_call call_ctx;
|
|
struct eventfd_ctx *error_ctx;
|
|
struct eventfd_ctx *log_ctx;
|
|
|
|
struct vhost_poll poll;
|
|
|
|
/* The routine to call when the Guest pings us, or timeout. */
|
|
vhost_work_fn_t handle_kick;
|
|
|
|
/* Last available index we saw. */
|
|
u16 last_avail_idx;
|
|
|
|
/* Caches available index value from user. */
|
|
u16 avail_idx;
|
|
|
|
/* Last index we used. */
|
|
u16 last_used_idx;
|
|
|
|
/* Used flags */
|
|
u16 used_flags;
|
|
|
|
/* Last used index value we have signalled on */
|
|
u16 signalled_used;
|
|
|
|
/* Last used index value we have signalled on */
|
|
bool signalled_used_valid;
|
|
|
|
/* Log writes to used structure. */
|
|
bool log_used;
|
|
u64 log_addr;
|
|
|
|
struct iovec iov[UIO_MAXIOV];
|
|
struct iovec iotlb_iov[64];
|
|
struct iovec *indirect;
|
|
struct vring_used_elem *heads;
|
|
/* Protected by virtqueue mutex. */
|
|
struct vhost_iotlb *umem;
|
|
struct vhost_iotlb *iotlb;
|
|
void *private_data;
|
|
u64 acked_features;
|
|
u64 acked_backend_features;
|
|
/* Log write descriptors */
|
|
void __user *log_base;
|
|
struct vhost_log *log;
|
|
struct iovec log_iov[64];
|
|
|
|
/* Ring endianness. Defaults to legacy native endianness.
|
|
* Set to true when starting a modern virtio device. */
|
|
bool is_le;
|
|
#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
|
|
/* Ring endianness requested by userspace for cross-endian support. */
|
|
bool user_be;
|
|
#endif
|
|
u32 busyloop_timeout;
|
|
};
|
|
|
|
struct vhost_msg_node {
|
|
union {
|
|
struct vhost_msg msg;
|
|
struct vhost_msg_v2 msg_v2;
|
|
};
|
|
struct vhost_virtqueue *vq;
|
|
struct list_head node;
|
|
};
|
|
|
|
struct vhost_dev {
|
|
struct mm_struct *mm;
|
|
struct mutex mutex;
|
|
struct vhost_virtqueue **vqs;
|
|
int nvqs;
|
|
struct eventfd_ctx *log_ctx;
|
|
struct llist_head work_list;
|
|
struct task_struct *worker;
|
|
struct vhost_iotlb *umem;
|
|
struct vhost_iotlb *iotlb;
|
|
spinlock_t iotlb_lock;
|
|
struct list_head read_list;
|
|
struct list_head pending_list;
|
|
wait_queue_head_t wait;
|
|
int iov_limit;
|
|
int weight;
|
|
int byte_weight;
|
|
u64 kcov_handle;
|
|
bool use_worker;
|
|
int (*msg_handler)(struct vhost_dev *dev,
|
|
struct vhost_iotlb_msg *msg);
|
|
};
|
|
|
|
bool vhost_exceeds_weight(struct vhost_virtqueue *vq, int pkts, int total_len);
|
|
void vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs,
|
|
int nvqs, int iov_limit, int weight, int byte_weight,
|
|
bool use_worker,
|
|
int (*msg_handler)(struct vhost_dev *dev,
|
|
struct vhost_iotlb_msg *msg));
|
|
long vhost_dev_set_owner(struct vhost_dev *dev);
|
|
bool vhost_dev_has_owner(struct vhost_dev *dev);
|
|
long vhost_dev_check_owner(struct vhost_dev *);
|
|
struct vhost_iotlb *vhost_dev_reset_owner_prepare(void);
|
|
void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_iotlb *iotlb);
|
|
void vhost_dev_cleanup(struct vhost_dev *);
|
|
void vhost_dev_stop(struct vhost_dev *);
|
|
long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp);
|
|
long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp);
|
|
bool vhost_vq_access_ok(struct vhost_virtqueue *vq);
|
|
bool vhost_log_access_ok(struct vhost_dev *);
|
|
|
|
int vhost_get_vq_desc(struct vhost_virtqueue *,
|
|
struct iovec iov[], unsigned int iov_count,
|
|
unsigned int *out_num, unsigned int *in_num,
|
|
struct vhost_log *log, unsigned int *log_num);
|
|
void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);
|
|
|
|
bool vhost_vq_is_setup(struct vhost_virtqueue *vq);
|
|
int vhost_vq_init_access(struct vhost_virtqueue *);
|
|
int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
|
|
int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads,
|
|
unsigned count);
|
|
void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *,
|
|
unsigned int id, int len);
|
|
void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *,
|
|
struct vring_used_elem *heads, unsigned count);
|
|
void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *);
|
|
void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *);
|
|
bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *);
|
|
bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *);
|
|
|
|
int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
|
|
unsigned int log_num, u64 len,
|
|
struct iovec *iov, int count);
|
|
int vq_meta_prefetch(struct vhost_virtqueue *vq);
|
|
|
|
struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type);
|
|
void vhost_enqueue_msg(struct vhost_dev *dev,
|
|
struct list_head *head,
|
|
struct vhost_msg_node *node);
|
|
struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev,
|
|
struct list_head *head);
|
|
void vhost_set_backend_features(struct vhost_dev *dev, u64 features);
|
|
|
|
__poll_t vhost_chr_poll(struct file *file, struct vhost_dev *dev,
|
|
poll_table *wait);
|
|
ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to,
|
|
int noblock);
|
|
ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
|
|
struct iov_iter *from);
|
|
int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled);
|
|
|
|
void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
|
|
struct vhost_iotlb_map *map);
|
|
|
|
#define vq_err(vq, fmt, ...) do { \
|
|
pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
|
|
if ((vq)->error_ctx) \
|
|
eventfd_signal((vq)->error_ctx, 1);\
|
|
} while (0)
|
|
|
|
enum {
|
|
VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) |
|
|
(1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
|
|
(1ULL << VIRTIO_RING_F_EVENT_IDX) |
|
|
(1ULL << VHOST_F_LOG_ALL) |
|
|
(1ULL << VIRTIO_F_ANY_LAYOUT) |
|
|
(1ULL << VIRTIO_F_VERSION_1)
|
|
};
|
|
|
|
/**
|
|
* vhost_vq_set_backend - Set backend.
|
|
*
|
|
* @vq Virtqueue.
|
|
* @private_data The private data.
|
|
*
|
|
* Context: Need to call with vq->mutex acquired.
|
|
*/
|
|
static inline void vhost_vq_set_backend(struct vhost_virtqueue *vq,
|
|
void *private_data)
|
|
{
|
|
vq->private_data = private_data;
|
|
}
|
|
|
|
/**
|
|
* vhost_vq_get_backend - Get backend.
|
|
*
|
|
* @vq Virtqueue.
|
|
*
|
|
* Context: Need to call with vq->mutex acquired.
|
|
* Return: Private data previously set with vhost_vq_set_backend.
|
|
*/
|
|
static inline void *vhost_vq_get_backend(struct vhost_virtqueue *vq)
|
|
{
|
|
return vq->private_data;
|
|
}
|
|
|
|
static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
|
|
{
|
|
return vq->acked_features & (1ULL << bit);
|
|
}
|
|
|
|
static inline bool vhost_backend_has_feature(struct vhost_virtqueue *vq, int bit)
|
|
{
|
|
return vq->acked_backend_features & (1ULL << bit);
|
|
}
|
|
|
|
#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
|
|
static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
|
|
{
|
|
return vq->is_le;
|
|
}
|
|
#else
|
|
static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
|
|
{
|
|
return virtio_legacy_is_little_endian() || vq->is_le;
|
|
}
|
|
#endif
|
|
|
|
/* Memory accessors */
|
|
static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val)
|
|
{
|
|
return __virtio16_to_cpu(vhost_is_little_endian(vq), val);
|
|
}
|
|
|
|
static inline __virtio16 cpu_to_vhost16(struct vhost_virtqueue *vq, u16 val)
|
|
{
|
|
return __cpu_to_virtio16(vhost_is_little_endian(vq), val);
|
|
}
|
|
|
|
static inline u32 vhost32_to_cpu(struct vhost_virtqueue *vq, __virtio32 val)
|
|
{
|
|
return __virtio32_to_cpu(vhost_is_little_endian(vq), val);
|
|
}
|
|
|
|
static inline __virtio32 cpu_to_vhost32(struct vhost_virtqueue *vq, u32 val)
|
|
{
|
|
return __cpu_to_virtio32(vhost_is_little_endian(vq), val);
|
|
}
|
|
|
|
static inline u64 vhost64_to_cpu(struct vhost_virtqueue *vq, __virtio64 val)
|
|
{
|
|
return __virtio64_to_cpu(vhost_is_little_endian(vq), val);
|
|
}
|
|
|
|
static inline __virtio64 cpu_to_vhost64(struct vhost_virtqueue *vq, u64 val)
|
|
{
|
|
return __cpu_to_virtio64(vhost_is_little_endian(vq), val);
|
|
}
|
|
#endif
|