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1/* SPDX-License-Identifier: GPL-2.0 */
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>
9#include <linux/poll.h>
10#include <linux/file.h>
11#include <linux/uio.h>
12#include <linux/virtio_config.h>
13#include <linux/virtio_ring.h>
14#include <linux/atomic.h>
15#include <linux/vhost_iotlb.h>
16#include <linux/irqbypass.h>
17
18struct vhost_work;
19struct vhost_task;
20typedef void (*vhost_work_fn_t)(struct vhost_work *work);
21
22#define VHOST_WORK_QUEUED 1
23struct vhost_work {
24 struct llist_node node;
25 vhost_work_fn_t fn;
26 unsigned long flags;
27};
28
29struct vhost_worker {
30 struct vhost_task *vtsk;
31 struct vhost_dev *dev;
32 /* Used to serialize device wide flushing with worker swapping. */
33 struct mutex mutex;
34 struct llist_head work_list;
35 u64 kcov_handle;
36 u32 id;
37 int attachment_cnt;
38 bool killed;
39};
40
41/* Poll a file (eventfd or socket) */
42/* Note: there's nothing vhost specific about this structure. */
43struct vhost_poll {
44 poll_table table;
45 wait_queue_head_t *wqh;
46 wait_queue_entry_t wait;
47 struct vhost_work work;
48 __poll_t mask;
49 struct vhost_dev *dev;
50 struct vhost_virtqueue *vq;
51};
52
53void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
54 __poll_t mask, struct vhost_dev *dev,
55 struct vhost_virtqueue *vq);
56int vhost_poll_start(struct vhost_poll *poll, struct file *file);
57void vhost_poll_stop(struct vhost_poll *poll);
58void vhost_poll_queue(struct vhost_poll *poll);
59
60void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
61void vhost_dev_flush(struct vhost_dev *dev);
62
63struct vhost_log {
64 u64 addr;
65 u64 len;
66};
67
68enum vhost_uaddr_type {
69 VHOST_ADDR_DESC = 0,
70 VHOST_ADDR_AVAIL = 1,
71 VHOST_ADDR_USED = 2,
72 VHOST_NUM_ADDRS = 3,
73};
74
75struct vhost_vring_call {
76 struct eventfd_ctx *ctx;
77 struct irq_bypass_producer producer;
78};
79
80/* The virtqueue structure describes a queue attached to a device. */
81struct vhost_virtqueue {
82 struct vhost_dev *dev;
83 struct vhost_worker __rcu *worker;
84
85 /* The actual ring of buffers. */
86 struct mutex mutex;
87 unsigned int num;
88 vring_desc_t __user *desc;
89 vring_avail_t __user *avail;
90 vring_used_t __user *used;
91 const struct vhost_iotlb_map *meta_iotlb[VHOST_NUM_ADDRS];
92 struct file *kick;
93 struct vhost_vring_call call_ctx;
94 struct eventfd_ctx *error_ctx;
95 struct eventfd_ctx *log_ctx;
96
97 struct vhost_poll poll;
98
99 /* The routine to call when the Guest pings us, or timeout. */
100 vhost_work_fn_t handle_kick;
101
102 /* Last available index we saw.
103 * Values are limited to 0x7fff, and the high bit is used as
104 * a wrap counter when using VIRTIO_F_RING_PACKED. */
105 u16 last_avail_idx;
106
107 /* Caches available index value from user. */
108 u16 avail_idx;
109
110 /* Last index we used.
111 * Values are limited to 0x7fff, and the high bit is used as
112 * a wrap counter when using VIRTIO_F_RING_PACKED. */
113 u16 last_used_idx;
114
115 /* Used flags */
116 u16 used_flags;
117
118 /* Last used index value we have signalled on */
119 u16 signalled_used;
120
121 /* Last used index value we have signalled on */
122 bool signalled_used_valid;
123
124 /* Log writes to used structure. */
125 bool log_used;
126 u64 log_addr;
127
128 struct iovec iov[UIO_MAXIOV];
129 struct iovec iotlb_iov[64];
130 struct iovec *indirect;
131 struct vring_used_elem *heads;
132 /* Protected by virtqueue mutex. */
133 struct vhost_iotlb *umem;
134 struct vhost_iotlb *iotlb;
135 void *private_data;
136 u64 acked_features;
137 u64 acked_backend_features;
138 /* Log write descriptors */
139 void __user *log_base;
140 struct vhost_log *log;
141 struct iovec log_iov[64];
142
143 /* Ring endianness. Defaults to legacy native endianness.
144 * Set to true when starting a modern virtio device. */
145 bool is_le;
146#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
147 /* Ring endianness requested by userspace for cross-endian support. */
148 bool user_be;
149#endif
150 u32 busyloop_timeout;
151};
152
153struct vhost_msg_node {
154 union {
155 struct vhost_msg msg;
156 struct vhost_msg_v2 msg_v2;
157 };
158 struct vhost_virtqueue *vq;
159 struct list_head node;
160};
161
162struct vhost_dev {
163 struct mm_struct *mm;
164 struct mutex mutex;
165 struct vhost_virtqueue **vqs;
166 int nvqs;
167 struct eventfd_ctx *log_ctx;
168 struct vhost_iotlb *umem;
169 struct vhost_iotlb *iotlb;
170 spinlock_t iotlb_lock;
171 struct list_head read_list;
172 struct list_head pending_list;
173 wait_queue_head_t wait;
174 int iov_limit;
175 int weight;
176 int byte_weight;
177 struct xarray worker_xa;
178 bool use_worker;
179 int (*msg_handler)(struct vhost_dev *dev, u32 asid,
180 struct vhost_iotlb_msg *msg);
181};
182
183bool vhost_exceeds_weight(struct vhost_virtqueue *vq, int pkts, int total_len);
184void vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs,
185 int nvqs, int iov_limit, int weight, int byte_weight,
186 bool use_worker,
187 int (*msg_handler)(struct vhost_dev *dev, u32 asid,
188 struct vhost_iotlb_msg *msg));
189long vhost_dev_set_owner(struct vhost_dev *dev);
190bool vhost_dev_has_owner(struct vhost_dev *dev);
191long vhost_dev_check_owner(struct vhost_dev *);
192struct vhost_iotlb *vhost_dev_reset_owner_prepare(void);
193void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_iotlb *iotlb);
194void vhost_dev_cleanup(struct vhost_dev *);
195void vhost_dev_stop(struct vhost_dev *);
196long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp);
197long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp);
198long vhost_worker_ioctl(struct vhost_dev *dev, unsigned int ioctl,
199 void __user *argp);
200bool vhost_vq_access_ok(struct vhost_virtqueue *vq);
201bool vhost_log_access_ok(struct vhost_dev *);
202void vhost_clear_msg(struct vhost_dev *dev);
203
204int vhost_get_vq_desc(struct vhost_virtqueue *,
205 struct iovec iov[], unsigned int iov_size,
206 unsigned int *out_num, unsigned int *in_num,
207 struct vhost_log *log, unsigned int *log_num);
208void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);
209
210bool vhost_vq_work_queue(struct vhost_virtqueue *vq, struct vhost_work *work);
211bool vhost_vq_has_work(struct vhost_virtqueue *vq);
212bool vhost_vq_is_setup(struct vhost_virtqueue *vq);
213int vhost_vq_init_access(struct vhost_virtqueue *);
214int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
215int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads,
216 unsigned count);
217void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *,
218 unsigned int id, int len);
219void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *,
220 struct vring_used_elem *heads, unsigned count);
221void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *);
222void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *);
223bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *);
224bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *);
225
226int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
227 unsigned int log_num, u64 len,
228 struct iovec *iov, int count);
229int vq_meta_prefetch(struct vhost_virtqueue *vq);
230
231struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type);
232void vhost_enqueue_msg(struct vhost_dev *dev,
233 struct list_head *head,
234 struct vhost_msg_node *node);
235struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev,
236 struct list_head *head);
237void vhost_set_backend_features(struct vhost_dev *dev, u64 features);
238
239__poll_t vhost_chr_poll(struct file *file, struct vhost_dev *dev,
240 poll_table *wait);
241ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to,
242 int noblock);
243ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
244 struct iov_iter *from);
245int vhost_init_device_iotlb(struct vhost_dev *d);
246
247void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
248 struct vhost_iotlb_map *map);
249
250#define vq_err(vq, fmt, ...) do { \
251 pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
252 if ((vq)->error_ctx) \
253 eventfd_signal((vq)->error_ctx);\
254 } while (0)
255
256enum {
257 VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) |
258 (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
259 (1ULL << VIRTIO_RING_F_EVENT_IDX) |
260 (1ULL << VHOST_F_LOG_ALL) |
261 (1ULL << VIRTIO_F_ANY_LAYOUT) |
262 (1ULL << VIRTIO_F_VERSION_1)
263};
264
265/**
266 * vhost_vq_set_backend - Set backend.
267 *
268 * @vq Virtqueue.
269 * @private_data The private data.
270 *
271 * Context: Need to call with vq->mutex acquired.
272 */
273static inline void vhost_vq_set_backend(struct vhost_virtqueue *vq,
274 void *private_data)
275{
276 vq->private_data = private_data;
277}
278
279/**
280 * vhost_vq_get_backend - Get backend.
281 *
282 * @vq Virtqueue.
283 *
284 * Context: Need to call with vq->mutex acquired.
285 * Return: Private data previously set with vhost_vq_set_backend.
286 */
287static inline void *vhost_vq_get_backend(struct vhost_virtqueue *vq)
288{
289 return vq->private_data;
290}
291
292static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
293{
294 return vq->acked_features & (1ULL << bit);
295}
296
297static inline bool vhost_backend_has_feature(struct vhost_virtqueue *vq, int bit)
298{
299 return vq->acked_backend_features & (1ULL << bit);
300}
301
302#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
303static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
304{
305 return vq->is_le;
306}
307#else
308static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
309{
310 return virtio_legacy_is_little_endian() || vq->is_le;
311}
312#endif
313
314/* Memory accessors */
315static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val)
316{
317 return __virtio16_to_cpu(vhost_is_little_endian(vq), val);
318}
319
320static inline __virtio16 cpu_to_vhost16(struct vhost_virtqueue *vq, u16 val)
321{
322 return __cpu_to_virtio16(vhost_is_little_endian(vq), val);
323}
324
325static inline u32 vhost32_to_cpu(struct vhost_virtqueue *vq, __virtio32 val)
326{
327 return __virtio32_to_cpu(vhost_is_little_endian(vq), val);
328}
329
330static inline __virtio32 cpu_to_vhost32(struct vhost_virtqueue *vq, u32 val)
331{
332 return __cpu_to_virtio32(vhost_is_little_endian(vq), val);
333}
334
335static inline u64 vhost64_to_cpu(struct vhost_virtqueue *vq, __virtio64 val)
336{
337 return __virtio64_to_cpu(vhost_is_little_endian(vq), val);
338}
339
340static inline __virtio64 cpu_to_vhost64(struct vhost_virtqueue *vq, u64 val)
341{
342 return __cpu_to_virtio64(vhost_is_little_endian(vq), val);
343}
344#endif
1/* SPDX-License-Identifier: GPL-2.0 */
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>
9#include <linux/poll.h>
10#include <linux/file.h>
11#include <linux/uio.h>
12#include <linux/virtio_config.h>
13#include <linux/virtio_ring.h>
14#include <linux/atomic.h>
15#include <linux/vhost_iotlb.h>
16#include <linux/irqbypass.h>
17
18struct vhost_work;
19typedef void (*vhost_work_fn_t)(struct vhost_work *work);
20
21#define VHOST_WORK_QUEUED 1
22struct vhost_work {
23 struct llist_node node;
24 vhost_work_fn_t fn;
25 unsigned long flags;
26};
27
28/* Poll a file (eventfd or socket) */
29/* Note: there's nothing vhost specific about this structure. */
30struct vhost_poll {
31 poll_table table;
32 wait_queue_head_t *wqh;
33 wait_queue_entry_t wait;
34 struct vhost_work work;
35 __poll_t mask;
36 struct vhost_dev *dev;
37};
38
39void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
40void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work);
41bool vhost_has_work(struct vhost_dev *dev);
42
43void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
44 __poll_t mask, struct vhost_dev *dev);
45int vhost_poll_start(struct vhost_poll *poll, struct file *file);
46void vhost_poll_stop(struct vhost_poll *poll);
47void vhost_poll_flush(struct vhost_poll *poll);
48void vhost_poll_queue(struct vhost_poll *poll);
49void vhost_work_dev_flush(struct vhost_dev *dev);
50
51struct vhost_log {
52 u64 addr;
53 u64 len;
54};
55
56enum 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
63struct vhost_vring_call {
64 struct eventfd_ctx *ctx;
65 struct irq_bypass_producer producer;
66};
67
68/* The virtqueue structure describes a queue attached to a device. */
69struct vhost_virtqueue {
70 struct vhost_dev *dev;
71
72 /* The actual ring of buffers. */
73 struct mutex mutex;
74 unsigned int num;
75 vring_desc_t __user *desc;
76 vring_avail_t __user *avail;
77 vring_used_t __user *used;
78 const struct vhost_iotlb_map *meta_iotlb[VHOST_NUM_ADDRS];
79 struct file *kick;
80 struct vhost_vring_call call_ctx;
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. */
87 vhost_work_fn_t handle_kick;
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
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
107 /* Log writes to used structure. */
108 bool log_used;
109 u64 log_addr;
110
111 struct iovec iov[UIO_MAXIOV];
112 struct iovec iotlb_iov[64];
113 struct iovec *indirect;
114 struct vring_used_elem *heads;
115 /* Protected by virtqueue mutex. */
116 struct vhost_iotlb *umem;
117 struct vhost_iotlb *iotlb;
118 void *private_data;
119 u64 acked_features;
120 u64 acked_backend_features;
121 /* Log write descriptors */
122 void __user *log_base;
123 struct vhost_log *log;
124 struct iovec log_iov[64];
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
133 u32 busyloop_timeout;
134};
135
136struct vhost_msg_node {
137 union {
138 struct vhost_msg msg;
139 struct vhost_msg_v2 msg_v2;
140 };
141 struct vhost_virtqueue *vq;
142 struct list_head node;
143};
144
145struct vhost_dev {
146 struct mm_struct *mm;
147 struct mutex mutex;
148 struct vhost_virtqueue **vqs;
149 int nvqs;
150 struct eventfd_ctx *log_ctx;
151 struct llist_head work_list;
152 struct task_struct *worker;
153 struct vhost_iotlb *umem;
154 struct vhost_iotlb *iotlb;
155 spinlock_t iotlb_lock;
156 struct list_head read_list;
157 struct list_head pending_list;
158 wait_queue_head_t wait;
159 int iov_limit;
160 int weight;
161 int byte_weight;
162 u64 kcov_handle;
163 bool use_worker;
164 int (*msg_handler)(struct vhost_dev *dev,
165 struct vhost_iotlb_msg *msg);
166};
167
168bool vhost_exceeds_weight(struct vhost_virtqueue *vq, int pkts, int total_len);
169void vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs,
170 int nvqs, int iov_limit, int weight, int byte_weight,
171 bool use_worker,
172 int (*msg_handler)(struct vhost_dev *dev,
173 struct vhost_iotlb_msg *msg));
174long vhost_dev_set_owner(struct vhost_dev *dev);
175bool vhost_dev_has_owner(struct vhost_dev *dev);
176long vhost_dev_check_owner(struct vhost_dev *);
177struct vhost_iotlb *vhost_dev_reset_owner_prepare(void);
178void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_iotlb *iotlb);
179void vhost_dev_cleanup(struct vhost_dev *);
180void vhost_dev_stop(struct vhost_dev *);
181long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp);
182long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp);
183bool vhost_vq_access_ok(struct vhost_virtqueue *vq);
184bool vhost_log_access_ok(struct vhost_dev *);
185
186int vhost_get_vq_desc(struct vhost_virtqueue *,
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);
190void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);
191
192bool vhost_vq_is_setup(struct vhost_virtqueue *vq);
193int vhost_vq_init_access(struct vhost_virtqueue *);
194int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
195int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads,
196 unsigned count);
197void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *,
198 unsigned int id, int len);
199void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *,
200 struct vring_used_elem *heads, unsigned count);
201void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *);
202void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *);
203bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *);
204bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *);
205
206int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
207 unsigned int log_num, u64 len,
208 struct iovec *iov, int count);
209int vq_meta_prefetch(struct vhost_virtqueue *vq);
210
211struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type);
212void vhost_enqueue_msg(struct vhost_dev *dev,
213 struct list_head *head,
214 struct vhost_msg_node *node);
215struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev,
216 struct list_head *head);
217void vhost_set_backend_features(struct vhost_dev *dev, u64 features);
218
219__poll_t vhost_chr_poll(struct file *file, struct vhost_dev *dev,
220 poll_table *wait);
221ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to,
222 int noblock);
223ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
224 struct iov_iter *from);
225int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled);
226
227void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
228 struct vhost_iotlb_map *map);
229
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
236enum {
237 VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) |
238 (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
239 (1ULL << VIRTIO_RING_F_EVENT_IDX) |
240 (1ULL << VHOST_F_LOG_ALL) |
241 (1ULL << VIRTIO_F_ANY_LAYOUT) |
242 (1ULL << VIRTIO_F_VERSION_1)
243};
244
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 */
253static 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 */
267static inline void *vhost_vq_get_backend(struct vhost_virtqueue *vq)
268{
269 return vq->private_data;
270}
271
272static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
273{
274 return vq->acked_features & (1ULL << bit);
275}
276
277static inline bool vhost_backend_has_feature(struct vhost_virtqueue *vq, int bit)
278{
279 return vq->acked_backend_features & (1ULL << bit);
280}
281
282#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
283static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
284{
285 return vq->is_le;
286}
287#else
288static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
289{
290 return virtio_legacy_is_little_endian() || vq->is_le;
291}
292#endif
293
294/* Memory accessors */
295static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val)
296{
297 return __virtio16_to_cpu(vhost_is_little_endian(vq), val);
298}
299
300static inline __virtio16 cpu_to_vhost16(struct vhost_virtqueue *vq, u16 val)
301{
302 return __cpu_to_virtio16(vhost_is_little_endian(vq), val);
303}
304
305static inline u32 vhost32_to_cpu(struct vhost_virtqueue *vq, __virtio32 val)
306{
307 return __virtio32_to_cpu(vhost_is_little_endian(vq), val);
308}
309
310static inline __virtio32 cpu_to_vhost32(struct vhost_virtqueue *vq, u32 val)
311{
312 return __cpu_to_virtio32(vhost_is_little_endian(vq), val);
313}
314
315static inline u64 vhost64_to_cpu(struct vhost_virtqueue *vq, __virtio64 val)
316{
317 return __virtio64_to_cpu(vhost_is_little_endian(vq), val);
318}
319
320static inline __virtio64 cpu_to_vhost64(struct vhost_virtqueue *vq, u64 val)
321{
322 return __cpu_to_virtio64(vhost_is_little_endian(vq), val);
323}
324#endif