[linux-block.git] / drivers / vhost / vhost.h

/* 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
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
3a4d5c94 MT	2	#ifndef _VHOST_H
	3	#define _VHOST_H
	4
	5	#include <linux/eventfd.h>
	6	#include <linux/vhost.h>
	7	#include <linux/mm.h>
	8	#include <linux/mutex.h>
3a4d5c94 MT	9	#include <linux/poll.h>
3a4d5c94 MT	10	#include <linux/file.h>
3a4d5c94 MT	11	#include <linux/uio.h>
	12	#include <linux/virtio_config.h>
	13	#include <linux/virtio_ring.h>
60063497	14	#include <linux/atomic.h>
0bbe3066	15	#include <linux/vhost_iotlb.h>
265a0ad8	16	#include <linux/irqbypass.h>
3a4d5c94	17
c23f3445 TH	18	struct vhost_work;
	19	typedef void (vhost_work_fn_t)(struct vhost_work work);
	20
04b96e55	21	#define VHOST_WORK_QUEUED 1
c23f3445	22	struct vhost_work {
04b96e55	23	struct llist_node node;
c23f3445	24	vhost_work_fn_t fn;
04b96e55	25	unsigned long flags;
c23f3445 TH	26	};
c23f3445 TH	27
3a4d5c94 MT	28	/* Poll a file (eventfd or socket) */
	29	/* Note: there's nothing vhost specific about this structure. */
	30	struct vhost_poll {
	31	poll_table table;
	32	wait_queue_head_t *wqh;
ac6424b9	33	wait_queue_entry_t wait;
c23f3445	34	struct vhost_work work;
58e3b602	35	__poll_t mask;
c23f3445	36	struct vhost_dev *dev;
3a4d5c94 MT	37	};
3a4d5c94 MT	38
163049ae SH	39	void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
163049ae SH	40	void vhost_work_queue(struct vhost_dev dev, struct vhost_work work);
526d3e7f	41	bool vhost_has_work(struct vhost_dev *dev);
163049ae	42
c23f3445	43	void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
58e3b602	44	__poll_t mask, struct vhost_dev *dev);
2b8b328b	45	int vhost_poll_start(struct vhost_poll poll, struct file file);
3a4d5c94 MT	46	void vhost_poll_stop(struct vhost_poll *poll);
	47	void vhost_poll_flush(struct vhost_poll *poll);
	48	void vhost_poll_queue(struct vhost_poll *poll);
1465cb61	49	void vhost_work_dev_flush(struct vhost_dev *dev);
3a4d5c94 MT	50
	51	struct vhost_log {
	52	u64 addr;
	53	u64 len;
	54	};
	55
f8894913 JW	56	enum vhost_uaddr_type {
	57	VHOST_ADDR_DESC = 0,
	58	VHOST_ADDR_AVAIL = 1,
	59	VHOST_ADDR_USED = 2,
	60	VHOST_NUM_ADDRS = 3,
	61	};
	62
265a0ad8 ZL	63	struct vhost_vring_call {
	64	struct eventfd_ctx *ctx;
	65	struct irq_bypass_producer producer;
265a0ad8 ZL	66	};
265a0ad8 ZL	67
3a4d5c94 MT	68	/* The virtqueue structure describes a queue attached to a device. */
	69	struct vhost_virtqueue {
	70	struct vhost_dev *dev;
	71
	72	/* The actual ring of buffers. */
	73	struct mutex mutex;
	74	unsigned int num;
a865e420 MT	75	vring_desc_t __user *desc;
	76	vring_avail_t __user *avail;
	77	vring_used_t __user *used;
0bbe3066	78	const struct vhost_iotlb_map *meta_iotlb[VHOST_NUM_ADDRS];
3a4d5c94	79	struct file *kick;
265a0ad8	80	struct vhost_vring_call call_ctx;
3a4d5c94 MT	81	struct eventfd_ctx *error_ctx;
	82	struct eventfd_ctx *log_ctx;
	83
	84	struct vhost_poll poll;
	85
	86	/* The routine to call when the Guest pings us, or timeout. */
c23f3445	87	vhost_work_fn_t handle_kick;
3a4d5c94 MT	88
	89	/* Last available index we saw. */
	90	u16 last_avail_idx;
	91
	92	/* Caches available index value from user. */
	93	u16 avail_idx;
	94
	95	/* Last index we used. */
	96	u16 last_used_idx;
	97
	98	/* Used flags */
	99	u16 used_flags;
	100
8ea8cf89 MT	101	/* Last used index value we have signalled on */
	102	u16 signalled_used;
	103
	104	/* Last used index value we have signalled on */
	105	bool signalled_used_valid;
	106
3a4d5c94 MT	107	/* Log writes to used structure. */
	108	bool log_used;
	109	u64 log_addr;
	110
e0e9b406	111	struct iovec iov[UIO_MAXIOV];
6b1e6cc7	112	struct iovec iotlb_iov[64];
e0e9b406	113	struct iovec *indirect;
e0e9b406	114	struct vring_used_elem *heads;
22fa90c7	115	/* Protected by virtqueue mutex. */
0bbe3066 JW	116	struct vhost_iotlb *umem;
0bbe3066 JW	117	struct vhost_iotlb *iotlb;
22fa90c7	118	void *private_data;
bd82752a	119	u64 acked_features;
429711ae	120	u64 acked_backend_features;
3a4d5c94 MT	121	/* Log write descriptors */
3a4d5c94 MT	122	void __user *log_base;
e0e9b406	123	struct vhost_log *log;
5e5e8736	124	struct iovec log_iov[64];
2751c988 GK	125
	126	/* Ring endianness. Defaults to legacy native endianness.
	127	* Set to true when starting a modern virtio device. */
	128	bool is_le;
	129	#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
	130	/* Ring endianness requested by userspace for cross-endian support. */
	131	bool user_be;
	132	#endif
03088137	133	u32 busyloop_timeout;
3a4d5c94 MT	134	};
3a4d5c94 MT	135
6b1e6cc7	136	struct vhost_msg_node {
429711ae JW	137	union {
	138	struct vhost_msg msg;
	139	struct vhost_msg_v2 msg_v2;
	140	};
6b1e6cc7 JW	141	struct vhost_virtqueue *vq;
	142	struct list_head node;
	143	};
	144
3a4d5c94	145	struct vhost_dev {
3a4d5c94 MT	146	struct mm_struct *mm;
3a4d5c94 MT	147	struct mutex mutex;
3ab2e420	148	struct vhost_virtqueue **vqs;
3a4d5c94	149	int nvqs;
3a4d5c94	150	struct eventfd_ctx *log_ctx;
04b96e55	151	struct llist_head work_list;
c23f3445	152	struct task_struct *worker;
0bbe3066 JW	153	struct vhost_iotlb *umem;
0bbe3066 JW	154	struct vhost_iotlb *iotlb;
6b1e6cc7 JW	155	spinlock_t iotlb_lock;
	156	struct list_head read_list;
	157	struct list_head pending_list;
	158	wait_queue_head_t wait;
b46a0bf7	159	int iov_limit;
e82b9b07 JW	160	int weight;
e82b9b07 JW	161	int byte_weight;
8f6a7f96	162	u64 kcov_handle;
01fcb1cb	163	bool use_worker;
792a4f2e JW	164	int (msg_handler)(struct vhost_dev dev,
792a4f2e JW	165	struct vhost_iotlb_msg *msg);
3a4d5c94 MT	166	};
3a4d5c94 MT	167
e82b9b07	168	bool vhost_exceeds_weight(struct vhost_virtqueue *vq, int pkts, int total_len);
b46a0bf7	169	void vhost_dev_init(struct vhost_dev , struct vhost_virtqueue *vqs,
792a4f2e	170	int nvqs, int iov_limit, int weight, int byte_weight,
01fcb1cb	171	bool use_worker,
792a4f2e JW	172	int (msg_handler)(struct vhost_dev dev,
792a4f2e JW	173	struct vhost_iotlb_msg *msg));
54db63c2	174	long vhost_dev_set_owner(struct vhost_dev *dev);
05c05351	175	bool vhost_dev_has_owner(struct vhost_dev *dev);
3a4d5c94	176	long vhost_dev_check_owner(struct vhost_dev *);
0bbe3066 JW	177	struct vhost_iotlb *vhost_dev_reset_owner_prepare(void);
0bbe3066 JW	178	void vhost_dev_reset_owner(struct vhost_dev dev, struct vhost_iotlb iotlb);
f6f93f75	179	void vhost_dev_cleanup(struct vhost_dev *);
b211616d	180	void vhost_dev_stop(struct vhost_dev *);
935cdee7	181	long vhost_dev_ioctl(struct vhost_dev , unsigned int ioctl, void __user argp);
26b36604	182	long vhost_vring_ioctl(struct vhost_dev d, unsigned int ioctl, void __user argp);
ddd3d408 SH	183	bool vhost_vq_access_ok(struct vhost_virtqueue *vq);
ddd3d408 SH	184	bool vhost_log_access_ok(struct vhost_dev *);
3a4d5c94	185
47283bef	186	int vhost_get_vq_desc(struct vhost_virtqueue *,
d5675bd2 MT	187	struct iovec iov[], unsigned int iov_count,
	188	unsigned int out_num, unsigned int in_num,
	189	struct vhost_log log, unsigned int log_num);
8dd014ad	190	void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);
3a4d5c94	191
6bcf3422	192	bool vhost_vq_is_setup(struct vhost_virtqueue *vq);
80f7d030	193	int vhost_vq_init_access(struct vhost_virtqueue *);
3a4d5c94	194	int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
8dd014ad DS	195	int vhost_add_used_n(struct vhost_virtqueue , struct vring_used_elem heads,
8dd014ad DS	196	unsigned count);
3a4d5c94	197	void vhost_add_used_and_signal(struct vhost_dev , struct vhost_virtqueue ,
8dd014ad DS	198	unsigned int id, int len);
	199	void vhost_add_used_and_signal_n(struct vhost_dev , struct vhost_virtqueue ,
	200	struct vring_used_elem *heads, unsigned count);
	201	void vhost_signal(struct vhost_dev , struct vhost_virtqueue );
8ea8cf89	202	void vhost_disable_notify(struct vhost_dev , struct vhost_virtqueue );
d4a60603	203	bool vhost_vq_avail_empty(struct vhost_dev , struct vhost_virtqueue );
8ea8cf89	204	bool vhost_enable_notify(struct vhost_dev , struct vhost_virtqueue );
3a4d5c94 MT	205
3a4d5c94 MT	206	int vhost_log_write(struct vhost_virtqueue vq, struct vhost_log log,
cc5e7107 JW	207	unsigned int log_num, u64 len,
cc5e7107 JW	208	struct iovec *iov, int count);
9b5e830b	209	int vq_meta_prefetch(struct vhost_virtqueue *vq);
6b1e6cc7 JW	210
	211	struct vhost_msg_node vhost_new_msg(struct vhost_virtqueue vq, int type);
	212	void vhost_enqueue_msg(struct vhost_dev *dev,
	213	struct list_head *head,
	214	struct vhost_msg_node *node);
	215	struct vhost_msg_node vhost_dequeue_msg(struct vhost_dev dev,
	216	struct list_head *head);
460f7ce1 JW	217	void vhost_set_backend_features(struct vhost_dev *dev, u64 features);
460f7ce1 JW	218
afc9a42b	219	__poll_t vhost_chr_poll(struct file file, struct vhost_dev dev,
6b1e6cc7 JW	220	poll_table *wait);
	221	ssize_t vhost_chr_read_iter(struct vhost_dev dev, struct iov_iter to,
	222	int noblock);
	223	ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
	224	struct iov_iter *from);
	225	int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled);
3a4d5c94	226
0bbe3066 JW	227	void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
	228	struct vhost_iotlb_map *map);
	229
3a4d5c94 MT	230	#define vq_err(vq, fmt, ...) do { \
	231	pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
	232	if ((vq)->error_ctx) \
	233	eventfd_signal((vq)->error_ctx, 1);\
	234	} while (0)
	235
	236	enum {
8ea8cf89 MT	237	VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) \|
	238	(1ULL << VIRTIO_RING_F_INDIRECT_DESC) \|
	239	(1ULL << VIRTIO_RING_F_EVENT_IDX) \|
4e9fa50c MT	240	(1ULL << VHOST_F_LOG_ALL) \|
	241	(1ULL << VIRTIO_F_ANY_LAYOUT) \|
	242	(1ULL << VIRTIO_F_VERSION_1)
3a4d5c94 MT	243	};
3a4d5c94 MT	244
247643f8 EP	245	/**
	246	* vhost_vq_set_backend - Set backend.
	247	*
	248	* @vq Virtqueue.
	249	* @private_data The private data.
	250	*
	251	* Context: Need to call with vq->mutex acquired.
	252	*/
	253	static inline void vhost_vq_set_backend(struct vhost_virtqueue *vq,
	254	void *private_data)
	255	{
	256	vq->private_data = private_data;
	257	}
	258
	259	/**
	260	* vhost_vq_get_backend - Get backend.
	261	*
	262	* @vq Virtqueue.
	263	*
	264	* Context: Need to call with vq->mutex acquired.
	265	* Return: Private data previously set with vhost_vq_set_backend.
	266	*/
	267	static inline void vhost_vq_get_backend(struct vhost_virtqueue vq)
	268	{
	269	return vq->private_data;
	270	}
	271
bd82752a	272	static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
3a4d5c94	273	{
bd82752a	274	return vq->acked_features & (1ULL << bit);
3a4d5c94	275	}
e05fd12b	276
429711ae JW	277	static inline bool vhost_backend_has_feature(struct vhost_virtqueue *vq, int bit)
	278	{
	279	return vq->acked_backend_features & (1ULL << bit);
	280	}
	281
e407f39a	282	#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
ab27c07f GK	283	static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
ab27c07f GK	284	{
2751c988	285	return vq->is_le;
ab27c07f	286	}
e407f39a MT	287	#else
	288	static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
	289	{
	290	return virtio_legacy_is_little_endian() \|\| vq->is_le;
	291	}
	292	#endif
ab27c07f	293
e05fd12b MT	294	/* Memory accessors */
	295	static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val)
	296	{
ab27c07f	297	return __virtio16_to_cpu(vhost_is_little_endian(vq), val);
e05fd12b MT	298	}
	299
	300	static inline __virtio16 cpu_to_vhost16(struct vhost_virtqueue *vq, u16 val)
	301	{
ab27c07f	302	return __cpu_to_virtio16(vhost_is_little_endian(vq), val);
e05fd12b MT	303	}
	304
	305	static inline u32 vhost32_to_cpu(struct vhost_virtqueue *vq, __virtio32 val)
	306	{
ab27c07f	307	return __virtio32_to_cpu(vhost_is_little_endian(vq), val);
e05fd12b MT	308	}
	309
	310	static inline __virtio32 cpu_to_vhost32(struct vhost_virtqueue *vq, u32 val)
	311	{
ab27c07f	312	return __cpu_to_virtio32(vhost_is_little_endian(vq), val);
e05fd12b MT	313	}
	314
	315	static inline u64 vhost64_to_cpu(struct vhost_virtqueue *vq, __virtio64 val)
	316	{
ab27c07f	317	return __virtio64_to_cpu(vhost_is_little_endian(vq), val);
e05fd12b MT	318	}
	319
	320	static inline __virtio64 cpu_to_vhost64(struct vhost_virtqueue *vq, u64 val)
	321	{
ab27c07f	322	return __cpu_to_virtio64(vhost_is_little_endian(vq), val);
e05fd12b	323	}
3a4d5c94	324	#endif