Contributors: 23
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Michael S. Tsirkin |
886 |
58.68% |
14 |
19.18% |
| Jason (Hui) Wang |
303 |
20.07% |
19 |
26.03% |
| Michael Christie |
63 |
4.17% |
12 |
16.44% |
| Tejun Heo |
52 |
3.44% |
1 |
1.37% |
| Greg Kurz |
42 |
2.78% |
3 |
4.11% |
| Eugenio Pérez |
31 |
2.05% |
1 |
1.37% |
| David L Stevens |
26 |
1.72% |
1 |
1.37% |
| Linus Torvalds (pre-git) |
24 |
1.59% |
1 |
1.37% |
| Zhu Lingshan |
18 |
1.19% |
1 |
1.37% |
| Asias He |
15 |
0.99% |
4 |
5.48% |
| Nicholas Bellinger |
13 |
0.86% |
2 |
2.74% |
| Stefan Hajnoczi |
9 |
0.60% |
2 |
2.74% |
| Li Wang |
7 |
0.46% |
1 |
1.37% |
| Gautam Dawar |
6 |
0.40% |
1 |
1.37% |
| Eric Auger |
4 |
0.26% |
1 |
1.37% |
| Al Viro |
3 |
0.20% |
2 |
2.74% |
| Shannon Nelson |
2 |
0.13% |
1 |
1.37% |
| Xianting Tian |
1 |
0.07% |
1 |
1.37% |
| Zhi Yong Wu |
1 |
0.07% |
1 |
1.37% |
| Ingo Molnar |
1 |
0.07% |
1 |
1.37% |
| Greg Kroah-Hartman |
1 |
0.07% |
1 |
1.37% |
| Sonny Rao |
1 |
0.07% |
1 |
1.37% |
| Arun Sharma |
1 |
0.07% |
1 |
1.37% |
| Total |
1510 |
|
73 |
|
/* 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;
struct vhost_task;
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;
};
struct vhost_worker {
struct vhost_task *vtsk;
/* Used to serialize device wide flushing with worker swapping. */
struct mutex mutex;
struct llist_head work_list;
u64 kcov_handle;
u32 id;
int attachment_cnt;
};
/* 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;
struct vhost_virtqueue *vq;
};
void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
__poll_t mask, struct vhost_dev *dev,
struct vhost_virtqueue *vq);
int vhost_poll_start(struct vhost_poll *poll, struct file *file);
void vhost_poll_stop(struct vhost_poll *poll);
void vhost_poll_queue(struct vhost_poll *poll);
void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
void vhost_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;
struct vhost_worker __rcu *worker;
/* 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.
* Values are limited to 0x7fff, and the high bit is used as
* a wrap counter when using VIRTIO_F_RING_PACKED. */
u16 last_avail_idx;
/* Caches available index value from user. */
u16 avail_idx;
/* Last index we used.
* Values are limited to 0x7fff, and the high bit is used as
* a wrap counter when using VIRTIO_F_RING_PACKED. */
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 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;
struct xarray worker_xa;
bool use_worker;
int (*msg_handler)(struct vhost_dev *dev, u32 asid,
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, u32 asid,
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);
long vhost_worker_ioctl(struct vhost_dev *dev, unsigned int ioctl,
void __user *argp);
bool vhost_vq_access_ok(struct vhost_virtqueue *vq);
bool vhost_log_access_ok(struct vhost_dev *);
void vhost_clear_msg(struct vhost_dev *dev);
int vhost_get_vq_desc(struct vhost_virtqueue *,
struct iovec iov[], unsigned int iov_size,
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);
void vhost_vq_flush(struct vhost_virtqueue *vq);
bool vhost_vq_work_queue(struct vhost_virtqueue *vq, struct vhost_work *work);
bool vhost_vq_has_work(struct vhost_virtqueue *vq);
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);
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