1
2#define _GNU_SOURCE
3#include <sched.h>
4#include <err.h>
5#include <linux/kernel.h>
6#include <linux/err.h>
7#include <linux/virtio.h>
8#include <linux/vringh.h>
9#include <linux/virtio_ring.h>
10#include <linux/uaccess.h>
11#include <sys/types.h>
12#include <sys/stat.h>
13#include <sys/mman.h>
14#include <sys/wait.h>
15#include <fcntl.h>
16
17#define USER_MEM (1024*1024)
18void *__user_addr_min, *__user_addr_max;
19void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
20static u64 user_addr_offset;
21
22#define RINGSIZE 256
23#define ALIGN 4096
24
25static void never_notify_host(struct virtqueue *vq)
26{
27 abort();
28}
29
30static void never_callback_guest(struct virtqueue *vq)
31{
32 abort();
33}
34
35static bool getrange_iov(struct vringh *vrh, u64 addr, struct vringh_range *r)
36{
37 if (addr < (u64)(unsigned long)__user_addr_min - user_addr_offset)
38 return false;
39 if (addr >= (u64)(unsigned long)__user_addr_max - user_addr_offset)
40 return false;
41
42 r->start = (u64)(unsigned long)__user_addr_min - user_addr_offset;
43 r->end_incl = (u64)(unsigned long)__user_addr_max - 1 - user_addr_offset;
44 r->offset = user_addr_offset;
45 return true;
46}
47
48
49static bool getrange_slow(struct vringh *vrh, u64 addr, struct vringh_range *r)
50{
51 if (addr < (u64)(unsigned long)__user_addr_min - user_addr_offset)
52 return false;
53 if (addr >= (u64)(unsigned long)__user_addr_max - user_addr_offset)
54 return false;
55
56 r->start = addr;
57 r->end_incl = r->start;
58 r->offset = user_addr_offset;
59 return true;
60}
61
62struct guest_virtio_device {
63 struct virtio_device vdev;
64 int to_host_fd;
65 unsigned long notifies;
66};
67
68static void parallel_notify_host(struct virtqueue *vq)
69{
70 struct guest_virtio_device *gvdev;
71
72 gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev);
73 write(gvdev->to_host_fd, "", 1);
74 gvdev->notifies++;
75}
76
77static void no_notify_host(struct virtqueue *vq)
78{
79}
80
81#define NUM_XFERS (10000000)
82
83
84static void find_cpus(unsigned int *first, unsigned int *last)
85{
86 unsigned int i;
87
88 *first = -1U;
89 *last = 0;
90 for (i = 0; i < 4096; i++) {
91 cpu_set_t set;
92 CPU_ZERO(&set);
93 CPU_SET(i, &set);
94 if (sched_setaffinity(getpid(), sizeof(set), &set) == 0) {
95 if (i < *first)
96 *first = i;
97 if (i > *last)
98 *last = i;
99 }
100 }
101}
102
103
104static inline int vringh_get_head(struct vringh *vrh, u16 *head)
105{
106 u16 avail_idx, i;
107 int err;
108
109 err = get_user(avail_idx, &vrh->vring.avail->idx);
110 if (err)
111 return err;
112
113 if (vrh->last_avail_idx == avail_idx)
114 return 0;
115
116
117 virtio_rmb(vrh->weak_barriers);
118
119 i = vrh->last_avail_idx & (vrh->vring.num - 1);
120
121 err = get_user(*head, &vrh->vring.avail->ring[i]);
122 if (err)
123 return err;
124
125 vrh->last_avail_idx++;
126 return 1;
127}
128
129static int parallel_test(unsigned long features,
130 bool (*getrange)(struct vringh *vrh,
131 u64 addr, struct vringh_range *r),
132 bool fast_vringh)
133{
134 void *host_map, *guest_map;
135 int fd, mapsize, to_guest[2], to_host[2];
136 unsigned long xfers = 0, notifies = 0, receives = 0;
137 unsigned int first_cpu, last_cpu;
138 cpu_set_t cpu_set;
139 char buf[128];
140
141
142 fd = open("/tmp/vringh_test-file", O_RDWR|O_CREAT|O_TRUNC, 0600);
143 if (fd < 0)
144 err(1, "Opening /tmp/vringh_test-file");
145
146
147 mapsize = vring_size(RINGSIZE, ALIGN)
148 + RINGSIZE * 2 * sizeof(int)
149 + RINGSIZE * 6 * sizeof(struct vring_desc);
150 mapsize = (mapsize + getpagesize() - 1) & ~(getpagesize() - 1);
151 ftruncate(fd, mapsize);
152
153
154 host_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
155 guest_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
156
157 pipe(to_guest);
158 pipe(to_host);
159
160 CPU_ZERO(&cpu_set);
161 find_cpus(&first_cpu, &last_cpu);
162 printf("Using CPUS %u and %u\n", first_cpu, last_cpu);
163 fflush(stdout);
164
165 if (fork() != 0) {
166 struct vringh vrh;
167 int status, err, rlen = 0;
168 char rbuf[5];
169
170
171 munmap(guest_map, mapsize);
172
173 __user_addr_min = host_map;
174 __user_addr_max = __user_addr_min + mapsize;
175 user_addr_offset = host_map - guest_map;
176 assert(user_addr_offset);
177
178 close(to_guest[0]);
179 close(to_host[1]);
180
181 vring_init(&vrh.vring, RINGSIZE, host_map, ALIGN);
182 vringh_init_user(&vrh, features, RINGSIZE, true,
183 vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
184 CPU_SET(first_cpu, &cpu_set);
185 if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
186 errx(1, "Could not set affinity to cpu %u", first_cpu);
187
188 while (xfers < NUM_XFERS) {
189 struct iovec host_riov[2], host_wiov[2];
190 struct vringh_iov riov, wiov;
191 u16 head, written;
192
193 if (fast_vringh) {
194 for (;;) {
195 err = vringh_get_head(&vrh, &head);
196 if (err != 0)
197 break;
198 err = vringh_need_notify_user(&vrh);
199 if (err < 0)
200 errx(1, "vringh_need_notify_user: %i",
201 err);
202 if (err) {
203 write(to_guest[1], "", 1);
204 notifies++;
205 }
206 }
207 if (err != 1)
208 errx(1, "vringh_get_head");
209 written = 0;
210 goto complete;
211 } else {
212 vringh_iov_init(&riov,
213 host_riov,
214 ARRAY_SIZE(host_riov));
215 vringh_iov_init(&wiov,
216 host_wiov,
217 ARRAY_SIZE(host_wiov));
218
219 err = vringh_getdesc_user(&vrh, &riov, &wiov,
220 getrange, &head);
221 }
222 if (err == 0) {
223 err = vringh_need_notify_user(&vrh);
224 if (err < 0)
225 errx(1, "vringh_need_notify_user: %i",
226 err);
227 if (err) {
228 write(to_guest[1], "", 1);
229 notifies++;
230 }
231
232 if (!vringh_notify_enable_user(&vrh))
233 continue;
234
235
236 if (read(to_host[0], buf, sizeof(buf)) < 1)
237 break;
238
239 vringh_notify_disable_user(&vrh);
240 receives++;
241 continue;
242 }
243 if (err != 1)
244 errx(1, "vringh_getdesc_user: %i", err);
245
246
247 if (riov.used) {
248 rlen = vringh_iov_pull_user(&riov, rbuf,
249 sizeof(rbuf));
250 if (rlen != 4)
251 errx(1, "vringh_iov_pull_user: %i",
252 rlen);
253 assert(riov.i == riov.used);
254 written = 0;
255 } else {
256 err = vringh_iov_push_user(&wiov, rbuf, rlen);
257 if (err != rlen)
258 errx(1, "vringh_iov_push_user: %i",
259 err);
260 assert(wiov.i == wiov.used);
261 written = err;
262 }
263 complete:
264 xfers++;
265
266 err = vringh_complete_user(&vrh, head, written);
267 if (err != 0)
268 errx(1, "vringh_complete_user: %i", err);
269 }
270
271 err = vringh_need_notify_user(&vrh);
272 if (err < 0)
273 errx(1, "vringh_need_notify_user: %i", err);
274 if (err) {
275 write(to_guest[1], "", 1);
276 notifies++;
277 }
278 wait(&status);
279 if (!WIFEXITED(status))
280 errx(1, "Child died with signal %i?", WTERMSIG(status));
281 if (WEXITSTATUS(status) != 0)
282 errx(1, "Child exited %i?", WEXITSTATUS(status));
283 printf("Host: notified %lu, pinged %lu\n", notifies, receives);
284 return 0;
285 } else {
286 struct guest_virtio_device gvdev;
287 struct virtqueue *vq;
288 unsigned int *data;
289 struct vring_desc *indirects;
290 unsigned int finished = 0;
291
292
293 data = guest_map + vring_size(RINGSIZE, ALIGN);
294 indirects = (void *)data + (RINGSIZE + 1) * 2 * sizeof(int);
295
296
297 munmap(host_map, mapsize);
298
299 close(to_guest[1]);
300 close(to_host[0]);
301
302 gvdev.vdev.features[0] = features;
303 gvdev.to_host_fd = to_host[1];
304 gvdev.notifies = 0;
305
306 CPU_SET(first_cpu, &cpu_set);
307 if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
308 err(1, "Could not set affinity to cpu %u", first_cpu);
309
310 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &gvdev.vdev, true,
311 guest_map, fast_vringh ? no_notify_host
312 : parallel_notify_host,
313 never_callback_guest, "guest vq");
314
315
316 __kfree_ignore_start = indirects;
317 __kfree_ignore_end = indirects + RINGSIZE * 6;
318
319 while (xfers < NUM_XFERS) {
320 struct scatterlist sg[4];
321 unsigned int num_sg, len;
322 int *dbuf, err;
323 bool output = !(xfers % 2);
324
325
326 while ((dbuf = virtqueue_get_buf(vq, &len)) != NULL) {
327 if (len == 4)
328 assert(*dbuf == finished - 1);
329 else if (!fast_vringh)
330 assert(*dbuf == finished);
331 finished++;
332 }
333
334
335 dbuf = data + (xfers % (RINGSIZE + 1));
336
337 if (output)
338 *dbuf = xfers;
339 else
340 *dbuf = -1;
341
342 switch ((xfers / sizeof(*dbuf)) % 4) {
343 case 0:
344
345 sg_init_table(sg, num_sg = 3);
346 sg_set_buf(&sg[0], (void *)dbuf, 1);
347 sg_set_buf(&sg[1], (void *)dbuf + 1, 2);
348 sg_set_buf(&sg[2], (void *)dbuf + 3, 1);
349 break;
350 case 1:
351 sg_init_table(sg, num_sg = 2);
352 sg_set_buf(&sg[0], (void *)dbuf, 1);
353 sg_set_buf(&sg[1], (void *)dbuf + 1, 3);
354 break;
355 case 2:
356 sg_init_table(sg, num_sg = 1);
357 sg_set_buf(&sg[0], (void *)dbuf, 4);
358 break;
359 case 3:
360 sg_init_table(sg, num_sg = 4);
361 sg_set_buf(&sg[0], (void *)dbuf, 1);
362 sg_set_buf(&sg[1], (void *)dbuf + 1, 1);
363 sg_set_buf(&sg[2], (void *)dbuf + 2, 1);
364 sg_set_buf(&sg[3], (void *)dbuf + 3, 1);
365 break;
366 }
367
368
369
370 __kmalloc_fake = indirects + (xfers % RINGSIZE) * 4;
371 if (output)
372 err = virtqueue_add_outbuf(vq, sg, num_sg, dbuf,
373 GFP_KERNEL);
374 else
375 err = virtqueue_add_inbuf(vq, sg, num_sg,
376 dbuf, GFP_KERNEL);
377
378 if (err == -ENOSPC) {
379 if (!virtqueue_enable_cb_delayed(vq))
380 continue;
381
382 if (read(to_guest[0], buf, sizeof(buf)) < 1)
383 break;
384
385 receives++;
386 virtqueue_disable_cb(vq);
387 continue;
388 }
389
390 if (err)
391 errx(1, "virtqueue_add_in/outbuf: %i", err);
392
393 xfers++;
394 virtqueue_kick(vq);
395 }
396
397
398 while (finished != xfers) {
399 int *dbuf;
400 unsigned int len;
401
402
403 dbuf = virtqueue_get_buf(vq, &len);
404 if (dbuf) {
405 if (len == 4)
406 assert(*dbuf == finished - 1);
407 else
408 assert(len == 0);
409 finished++;
410 continue;
411 }
412
413 if (!virtqueue_enable_cb_delayed(vq))
414 continue;
415 if (read(to_guest[0], buf, sizeof(buf)) < 1)
416 break;
417
418 receives++;
419 virtqueue_disable_cb(vq);
420 }
421
422 printf("Guest: notified %lu, pinged %lu\n",
423 gvdev.notifies, receives);
424 vring_del_virtqueue(vq);
425 return 0;
426 }
427}
428
429int main(int argc, char *argv[])
430{
431 struct virtio_device vdev;
432 struct virtqueue *vq;
433 struct vringh vrh;
434 struct scatterlist guest_sg[RINGSIZE], *sgs[2];
435 struct iovec host_riov[2], host_wiov[2];
436 struct vringh_iov riov, wiov;
437 struct vring_used_elem used[RINGSIZE];
438 char buf[28];
439 u16 head;
440 int err;
441 unsigned i;
442 void *ret;
443 bool (*getrange)(struct vringh *vrh, u64 addr, struct vringh_range *r);
444 bool fast_vringh = false, parallel = false;
445
446 getrange = getrange_iov;
447 vdev.features[0] = 0;
448
449 while (argv[1]) {
450 if (strcmp(argv[1], "--indirect") == 0)
451 vdev.features[0] |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
452 else if (strcmp(argv[1], "--eventidx") == 0)
453 vdev.features[0] |= (1 << VIRTIO_RING_F_EVENT_IDX);
454 else if (strcmp(argv[1], "--slow-range") == 0)
455 getrange = getrange_slow;
456 else if (strcmp(argv[1], "--fast-vringh") == 0)
457 fast_vringh = true;
458 else if (strcmp(argv[1], "--parallel") == 0)
459 parallel = true;
460 else
461 errx(1, "Unknown arg %s", argv[1]);
462 argv++;
463 }
464
465 if (parallel)
466 return parallel_test(vdev.features[0], getrange, fast_vringh);
467
468 if (posix_memalign(&__user_addr_min, PAGE_SIZE, USER_MEM) != 0)
469 abort();
470 __user_addr_max = __user_addr_min + USER_MEM;
471 memset(__user_addr_min, 0, vring_size(RINGSIZE, ALIGN));
472
473
474 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
475 __user_addr_min,
476 never_notify_host, never_callback_guest,
477 "guest vq");
478
479
480 vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN);
481 vringh_init_user(&vrh, vdev.features[0], RINGSIZE, true,
482 vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
483
484
485 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
486 if (err != 0)
487 errx(1, "vringh_getdesc_user: %i", err);
488
489
490 memcpy(__user_addr_max - 1, "a", 1);
491 sg_init_table(guest_sg, 1);
492 sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1);
493 sg_init_table(guest_sg+1, 1);
494 sg_set_buf(&guest_sg[1], __user_addr_max - 3, 2);
495 sgs[0] = &guest_sg[0];
496 sgs[1] = &guest_sg[1];
497
498
499 __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN);
500 err = virtqueue_add_sgs(vq, sgs, 1, 1, &err, GFP_KERNEL);
501 if (err)
502 errx(1, "virtqueue_add_sgs: %i", err);
503 __kmalloc_fake = NULL;
504
505
506 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
507 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
508
509 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
510 if (err != 1)
511 errx(1, "vringh_getdesc_user: %i", err);
512
513 assert(riov.used == 1);
514 assert(riov.iov[0].iov_base == __user_addr_max - 1);
515 assert(riov.iov[0].iov_len == 1);
516 if (getrange != getrange_slow) {
517 assert(wiov.used == 1);
518 assert(wiov.iov[0].iov_base == __user_addr_max - 3);
519 assert(wiov.iov[0].iov_len == 2);
520 } else {
521 assert(wiov.used == 2);
522 assert(wiov.iov[0].iov_base == __user_addr_max - 3);
523 assert(wiov.iov[0].iov_len == 1);
524 assert(wiov.iov[1].iov_base == __user_addr_max - 2);
525 assert(wiov.iov[1].iov_len == 1);
526 }
527
528 err = vringh_iov_pull_user(&riov, buf, 5);
529 if (err != 1)
530 errx(1, "vringh_iov_pull_user: %i", err);
531 assert(buf[0] == 'a');
532 assert(riov.i == 1);
533 assert(vringh_iov_pull_user(&riov, buf, 5) == 0);
534
535 memcpy(buf, "bcdef", 5);
536 err = vringh_iov_push_user(&wiov, buf, 5);
537 if (err != 2)
538 errx(1, "vringh_iov_push_user: %i", err);
539 assert(memcmp(__user_addr_max - 3, "bc", 2) == 0);
540 assert(wiov.i == wiov.used);
541 assert(vringh_iov_push_user(&wiov, buf, 5) == 0);
542
543
544 err = vringh_complete_user(&vrh, head, err);
545 if (err != 0)
546 errx(1, "vringh_complete_user: %i", err);
547
548
549 __kfree_ignore_start = __user_addr_min + vring_size(RINGSIZE, ALIGN);
550 __kfree_ignore_end = __kfree_ignore_start + 1;
551 ret = virtqueue_get_buf(vq, &i);
552 if (ret != &err)
553 errx(1, "virtqueue_get_buf: %p", ret);
554 assert(i == 2);
555
556
557 sg_init_table(guest_sg, RINGSIZE);
558 for (i = 0; i < RINGSIZE; i++) {
559 sg_set_buf(&guest_sg[i],
560 __user_addr_max - USER_MEM/4, USER_MEM/4);
561 }
562
563
564 for (i = 0; i < USER_MEM/4; i++)
565 ((char *)__user_addr_max - USER_MEM/4)[i] = i;
566
567
568 __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN);
569 err = virtqueue_add_outbuf(vq, guest_sg, RINGSIZE, &err, GFP_KERNEL);
570 if (err)
571 errx(1, "virtqueue_add_outbuf (large): %i", err);
572 __kmalloc_fake = NULL;
573
574
575 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
576 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
577
578 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
579 if (err != 1)
580 errx(1, "vringh_getdesc_user: %i", err);
581
582 assert(riov.max_num & VRINGH_IOV_ALLOCATED);
583 assert(riov.iov != host_riov);
584 if (getrange != getrange_slow)
585 assert(riov.used == RINGSIZE);
586 else
587 assert(riov.used == RINGSIZE * USER_MEM/4);
588
589 assert(!(wiov.max_num & VRINGH_IOV_ALLOCATED));
590 assert(wiov.used == 0);
591
592
593 for (i = 0; i < RINGSIZE * USER_MEM/4; i += 3) {
594 err = vringh_iov_pull_user(&riov, buf, 3);
595 if (err != 3 && i + err != RINGSIZE * USER_MEM/4)
596 errx(1, "vringh_iov_pull_user large: %i", err);
597 assert(buf[0] == (char)i);
598 assert(err < 2 || buf[1] == (char)(i + 1));
599 assert(err < 3 || buf[2] == (char)(i + 2));
600 }
601 assert(riov.i == riov.used);
602 vringh_iov_cleanup(&riov);
603 vringh_iov_cleanup(&wiov);
604
605
606 used[0].id = head;
607 used[0].len = 0;
608 err = vringh_complete_multi_user(&vrh, used, 1);
609 if (err)
610 errx(1, "vringh_complete_multi_user(1): %i", err);
611
612
613 ret = virtqueue_get_buf(vq, &i);
614 if (ret != &err)
615 errx(1, "virtqueue_get_buf: %p", ret);
616
617
618 sg_init_table(guest_sg, 1);
619 sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1);
620 for (i = 0; i < RINGSIZE; i++) {
621 err = virtqueue_add_outbuf(vq, guest_sg, 1, &err, GFP_KERNEL);
622 if (err)
623 errx(1, "virtqueue_add_outbuf (multiple): %i", err);
624 }
625
626
627 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
628 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
629
630 for (i = 0; i < RINGSIZE; i++) {
631 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
632 if (err != 1)
633 errx(1, "vringh_getdesc_user: %i", err);
634 used[i].id = head;
635 used[i].len = 0;
636 }
637
638 assert(vrh.vring.used->idx % RINGSIZE != 0);
639 err = vringh_complete_multi_user(&vrh, used, RINGSIZE);
640 if (err)
641 errx(1, "vringh_complete_multi_user: %i", err);
642
643
644 for (i = 0; i < RINGSIZE; i++) {
645 unsigned len;
646 assert(virtqueue_get_buf(vq, &len) != NULL);
647 }
648
649
650 if (vdev.features[0] & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
651 char *data = __user_addr_max - USER_MEM/4;
652 struct vring_desc *d = __user_addr_max - USER_MEM/2;
653 struct vring vring;
654
655
656 vdev.features[0] &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
657 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
658 __user_addr_min,
659 never_notify_host,
660 never_callback_guest,
661 "guest vq");
662
663 sg_init_table(guest_sg, 4);
664 sg_set_buf(&guest_sg[0], d, sizeof(*d)*2);
665 sg_set_buf(&guest_sg[1], d + 2, sizeof(*d)*1);
666 sg_set_buf(&guest_sg[2], data + 6, 4);
667 sg_set_buf(&guest_sg[3], d + 3, sizeof(*d)*3);
668
669 err = virtqueue_add_outbuf(vq, guest_sg, 4, &err, GFP_KERNEL);
670 if (err)
671 errx(1, "virtqueue_add_outbuf (indirect): %i", err);
672
673 vring_init(&vring, RINGSIZE, __user_addr_min, ALIGN);
674
675
676 assert(vring.desc[0].addr == (unsigned long)d);
677 assert(vring.desc[1].addr == (unsigned long)(d+2));
678 assert(vring.desc[2].addr == (unsigned long)data + 6);
679 assert(vring.desc[3].addr == (unsigned long)(d+3));
680 vring.desc[0].flags |= VRING_DESC_F_INDIRECT;
681 vring.desc[1].flags |= VRING_DESC_F_INDIRECT;
682 vring.desc[3].flags |= VRING_DESC_F_INDIRECT;
683
684
685 d[0].addr = (unsigned long)data;
686 d[0].len = 1;
687 d[0].flags = VRING_DESC_F_NEXT;
688 d[0].next = 1;
689 d[1].addr = (unsigned long)data + 1;
690 d[1].len = 2;
691 d[1].flags = 0;
692
693
694 d[2].addr = (unsigned long)data + 3;
695 d[2].len = 3;
696 d[2].flags = 0;
697
698
699 d[3].addr = (unsigned long)data + 10;
700 d[3].len = 5;
701 d[3].flags = VRING_DESC_F_NEXT;
702 d[3].next = 1;
703 d[4].addr = (unsigned long)data + 15;
704 d[4].len = 6;
705 d[4].flags = VRING_DESC_F_NEXT;
706 d[4].next = 2;
707 d[5].addr = (unsigned long)data + 21;
708 d[5].len = 7;
709 d[5].flags = 0;
710
711
712 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
713 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
714
715 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
716 if (err != 1)
717 errx(1, "vringh_getdesc_user: %i", err);
718
719 if (head != 0)
720 errx(1, "vringh_getdesc_user: head %i not 0", head);
721
722 assert(riov.max_num & VRINGH_IOV_ALLOCATED);
723 if (getrange != getrange_slow)
724 assert(riov.used == 7);
725 else
726 assert(riov.used == 28);
727 err = vringh_iov_pull_user(&riov, buf, 29);
728 assert(err == 28);
729
730
731 for (i = 0; i < err; i++)
732 assert(buf[i] == i);
733 vringh_iov_cleanup(&riov);
734 }
735
736
737 vring_del_virtqueue(vq);
738 free(__user_addr_min);
739
740 return 0;
741}
742
