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1/* Simple test of virtio code, entirely in userpsace. */
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 bool 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/* We return single byte ranges. */
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 bool parallel_notify_host(struct virtqueue *vq)
69{
70 int rc;
71 struct guest_virtio_device *gvdev;
72
73 gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev);
74 rc = write(gvdev->to_host_fd, "", 1);
75 if (rc < 0)
76 return false;
77 gvdev->notifies++;
78 return true;
79}
80
81static bool no_notify_host(struct virtqueue *vq)
82{
83 return true;
84}
85
86#define NUM_XFERS (10000000)
87
88/* We aim for two "distant" cpus. */
89static void find_cpus(unsigned int *first, unsigned int *last)
90{
91 unsigned int i;
92
93 *first = -1U;
94 *last = 0;
95 for (i = 0; i < 4096; i++) {
96 cpu_set_t set;
97 CPU_ZERO(&set);
98 CPU_SET(i, &set);
99 if (sched_setaffinity(getpid(), sizeof(set), &set) == 0) {
100 if (i < *first)
101 *first = i;
102 if (i > *last)
103 *last = i;
104 }
105 }
106}
107
108/* Opencoded version for fast mode */
109static inline int vringh_get_head(struct vringh *vrh, u16 *head)
110{
111 u16 avail_idx, i;
112 int err;
113
114 err = get_user(avail_idx, &vrh->vring.avail->idx);
115 if (err)
116 return err;
117
118 if (vrh->last_avail_idx == avail_idx)
119 return 0;
120
121 /* Only get avail ring entries after they have been exposed by guest. */
122 virtio_rmb(vrh->weak_barriers);
123
124 i = vrh->last_avail_idx & (vrh->vring.num - 1);
125
126 err = get_user(*head, &vrh->vring.avail->ring[i]);
127 if (err)
128 return err;
129
130 vrh->last_avail_idx++;
131 return 1;
132}
133
134static int parallel_test(unsigned long features,
135 bool (*getrange)(struct vringh *vrh,
136 u64 addr, struct vringh_range *r),
137 bool fast_vringh)
138{
139 void *host_map, *guest_map;
140 int fd, mapsize, to_guest[2], to_host[2];
141 unsigned long xfers = 0, notifies = 0, receives = 0;
142 unsigned int first_cpu, last_cpu;
143 cpu_set_t cpu_set;
144 char buf[128];
145
146 /* Create real file to mmap. */
147 fd = open("/tmp/vringh_test-file", O_RDWR|O_CREAT|O_TRUNC, 0600);
148 if (fd < 0)
149 err(1, "Opening /tmp/vringh_test-file");
150
151 /* Extra room at the end for some data, and indirects */
152 mapsize = vring_size(RINGSIZE, ALIGN)
153 + RINGSIZE * 2 * sizeof(int)
154 + RINGSIZE * 6 * sizeof(struct vring_desc);
155 mapsize = (mapsize + getpagesize() - 1) & ~(getpagesize() - 1);
156 ftruncate(fd, mapsize);
157
158 /* Parent and child use separate addresses, to check our mapping logic! */
159 host_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
160 guest_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
161
162 pipe(to_guest);
163 pipe(to_host);
164
165 CPU_ZERO(&cpu_set);
166 find_cpus(&first_cpu, &last_cpu);
167 printf("Using CPUS %u and %u\n", first_cpu, last_cpu);
168 fflush(stdout);
169
170 if (fork() != 0) {
171 struct vringh vrh;
172 int status, err, rlen = 0;
173 char rbuf[5];
174
175 /* We are the host: never access guest addresses! */
176 munmap(guest_map, mapsize);
177
178 __user_addr_min = host_map;
179 __user_addr_max = __user_addr_min + mapsize;
180 user_addr_offset = host_map - guest_map;
181 assert(user_addr_offset);
182
183 close(to_guest[0]);
184 close(to_host[1]);
185
186 vring_init(&vrh.vring, RINGSIZE, host_map, ALIGN);
187 vringh_init_user(&vrh, features, RINGSIZE, true,
188 vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
189 CPU_SET(first_cpu, &cpu_set);
190 if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
191 errx(1, "Could not set affinity to cpu %u", first_cpu);
192
193 while (xfers < NUM_XFERS) {
194 struct iovec host_riov[2], host_wiov[2];
195 struct vringh_iov riov, wiov;
196 u16 head, written;
197
198 if (fast_vringh) {
199 for (;;) {
200 err = vringh_get_head(&vrh, &head);
201 if (err != 0)
202 break;
203 err = vringh_need_notify_user(&vrh);
204 if (err < 0)
205 errx(1, "vringh_need_notify_user: %i",
206 err);
207 if (err) {
208 write(to_guest[1], "", 1);
209 notifies++;
210 }
211 }
212 if (err != 1)
213 errx(1, "vringh_get_head");
214 written = 0;
215 goto complete;
216 } else {
217 vringh_iov_init(&riov,
218 host_riov,
219 ARRAY_SIZE(host_riov));
220 vringh_iov_init(&wiov,
221 host_wiov,
222 ARRAY_SIZE(host_wiov));
223
224 err = vringh_getdesc_user(&vrh, &riov, &wiov,
225 getrange, &head);
226 }
227 if (err == 0) {
228 err = vringh_need_notify_user(&vrh);
229 if (err < 0)
230 errx(1, "vringh_need_notify_user: %i",
231 err);
232 if (err) {
233 write(to_guest[1], "", 1);
234 notifies++;
235 }
236
237 if (!vringh_notify_enable_user(&vrh))
238 continue;
239
240 /* Swallow all notifies at once. */
241 if (read(to_host[0], buf, sizeof(buf)) < 1)
242 break;
243
244 vringh_notify_disable_user(&vrh);
245 receives++;
246 continue;
247 }
248 if (err != 1)
249 errx(1, "vringh_getdesc_user: %i", err);
250
251 /* We simply copy bytes. */
252 if (riov.used) {
253 rlen = vringh_iov_pull_user(&riov, rbuf,
254 sizeof(rbuf));
255 if (rlen != 4)
256 errx(1, "vringh_iov_pull_user: %i",
257 rlen);
258 assert(riov.i == riov.used);
259 written = 0;
260 } else {
261 err = vringh_iov_push_user(&wiov, rbuf, rlen);
262 if (err != rlen)
263 errx(1, "vringh_iov_push_user: %i",
264 err);
265 assert(wiov.i == wiov.used);
266 written = err;
267 }
268 complete:
269 xfers++;
270
271 err = vringh_complete_user(&vrh, head, written);
272 if (err != 0)
273 errx(1, "vringh_complete_user: %i", err);
274 }
275
276 err = vringh_need_notify_user(&vrh);
277 if (err < 0)
278 errx(1, "vringh_need_notify_user: %i", err);
279 if (err) {
280 write(to_guest[1], "", 1);
281 notifies++;
282 }
283 wait(&status);
284 if (!WIFEXITED(status))
285 errx(1, "Child died with signal %i?", WTERMSIG(status));
286 if (WEXITSTATUS(status) != 0)
287 errx(1, "Child exited %i?", WEXITSTATUS(status));
288 printf("Host: notified %lu, pinged %lu\n", notifies, receives);
289 return 0;
290 } else {
291 struct guest_virtio_device gvdev;
292 struct virtqueue *vq;
293 unsigned int *data;
294 struct vring_desc *indirects;
295 unsigned int finished = 0;
296
297 /* We pass sg[]s pointing into here, but we need RINGSIZE+1 */
298 data = guest_map + vring_size(RINGSIZE, ALIGN);
299 indirects = (void *)data + (RINGSIZE + 1) * 2 * sizeof(int);
300
301 /* We are the guest. */
302 munmap(host_map, mapsize);
303
304 close(to_guest[1]);
305 close(to_host[0]);
306
307 gvdev.vdev.features[0] = features;
308 gvdev.to_host_fd = to_host[1];
309 gvdev.notifies = 0;
310
311 CPU_SET(first_cpu, &cpu_set);
312 if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
313 err(1, "Could not set affinity to cpu %u", first_cpu);
314
315 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &gvdev.vdev, true,
316 guest_map, fast_vringh ? no_notify_host
317 : parallel_notify_host,
318 never_callback_guest, "guest vq");
319
320 /* Don't kfree indirects. */
321 __kfree_ignore_start = indirects;
322 __kfree_ignore_end = indirects + RINGSIZE * 6;
323
324 while (xfers < NUM_XFERS) {
325 struct scatterlist sg[4];
326 unsigned int num_sg, len;
327 int *dbuf, err;
328 bool output = !(xfers % 2);
329
330 /* Consume bufs. */
331 while ((dbuf = virtqueue_get_buf(vq, &len)) != NULL) {
332 if (len == 4)
333 assert(*dbuf == finished - 1);
334 else if (!fast_vringh)
335 assert(*dbuf == finished);
336 finished++;
337 }
338
339 /* Produce a buffer. */
340 dbuf = data + (xfers % (RINGSIZE + 1));
341
342 if (output)
343 *dbuf = xfers;
344 else
345 *dbuf = -1;
346
347 switch ((xfers / sizeof(*dbuf)) % 4) {
348 case 0:
349 /* Nasty three-element sg list. */
350 sg_init_table(sg, num_sg = 3);
351 sg_set_buf(&sg[0], (void *)dbuf, 1);
352 sg_set_buf(&sg[1], (void *)dbuf + 1, 2);
353 sg_set_buf(&sg[2], (void *)dbuf + 3, 1);
354 break;
355 case 1:
356 sg_init_table(sg, num_sg = 2);
357 sg_set_buf(&sg[0], (void *)dbuf, 1);
358 sg_set_buf(&sg[1], (void *)dbuf + 1, 3);
359 break;
360 case 2:
361 sg_init_table(sg, num_sg = 1);
362 sg_set_buf(&sg[0], (void *)dbuf, 4);
363 break;
364 case 3:
365 sg_init_table(sg, num_sg = 4);
366 sg_set_buf(&sg[0], (void *)dbuf, 1);
367 sg_set_buf(&sg[1], (void *)dbuf + 1, 1);
368 sg_set_buf(&sg[2], (void *)dbuf + 2, 1);
369 sg_set_buf(&sg[3], (void *)dbuf + 3, 1);
370 break;
371 }
372
373 /* May allocate an indirect, so force it to allocate
374 * user addr */
375 __kmalloc_fake = indirects + (xfers % RINGSIZE) * 4;
376 if (output)
377 err = virtqueue_add_outbuf(vq, sg, num_sg, dbuf,
378 GFP_KERNEL);
379 else
380 err = virtqueue_add_inbuf(vq, sg, num_sg,
381 dbuf, GFP_KERNEL);
382
383 if (err == -ENOSPC) {
384 if (!virtqueue_enable_cb_delayed(vq))
385 continue;
386 /* Swallow all notifies at once. */
387 if (read(to_guest[0], buf, sizeof(buf)) < 1)
388 break;
389
390 receives++;
391 virtqueue_disable_cb(vq);
392 continue;
393 }
394
395 if (err)
396 errx(1, "virtqueue_add_in/outbuf: %i", err);
397
398 xfers++;
399 virtqueue_kick(vq);
400 }
401
402 /* Any extra? */
403 while (finished != xfers) {
404 int *dbuf;
405 unsigned int len;
406
407 /* Consume bufs. */
408 dbuf = virtqueue_get_buf(vq, &len);
409 if (dbuf) {
410 if (len == 4)
411 assert(*dbuf == finished - 1);
412 else
413 assert(len == 0);
414 finished++;
415 continue;
416 }
417
418 if (!virtqueue_enable_cb_delayed(vq))
419 continue;
420 if (read(to_guest[0], buf, sizeof(buf)) < 1)
421 break;
422
423 receives++;
424 virtqueue_disable_cb(vq);
425 }
426
427 printf("Guest: notified %lu, pinged %lu\n",
428 gvdev.notifies, receives);
429 vring_del_virtqueue(vq);
430 return 0;
431 }
432}
433
434int main(int argc, char *argv[])
435{
436 struct virtio_device vdev;
437 struct virtqueue *vq;
438 struct vringh vrh;
439 struct scatterlist guest_sg[RINGSIZE], *sgs[2];
440 struct iovec host_riov[2], host_wiov[2];
441 struct vringh_iov riov, wiov;
442 struct vring_used_elem used[RINGSIZE];
443 char buf[28];
444 u16 head;
445 int err;
446 unsigned i;
447 void *ret;
448 bool (*getrange)(struct vringh *vrh, u64 addr, struct vringh_range *r);
449 bool fast_vringh = false, parallel = false;
450
451 getrange = getrange_iov;
452 vdev.features[0] = 0;
453
454 while (argv[1]) {
455 if (strcmp(argv[1], "--indirect") == 0)
456 vdev.features[0] |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
457 else if (strcmp(argv[1], "--eventidx") == 0)
458 vdev.features[0] |= (1 << VIRTIO_RING_F_EVENT_IDX);
459 else if (strcmp(argv[1], "--slow-range") == 0)
460 getrange = getrange_slow;
461 else if (strcmp(argv[1], "--fast-vringh") == 0)
462 fast_vringh = true;
463 else if (strcmp(argv[1], "--parallel") == 0)
464 parallel = true;
465 else
466 errx(1, "Unknown arg %s", argv[1]);
467 argv++;
468 }
469
470 if (parallel)
471 return parallel_test(vdev.features[0], getrange, fast_vringh);
472
473 if (posix_memalign(&__user_addr_min, PAGE_SIZE, USER_MEM) != 0)
474 abort();
475 __user_addr_max = __user_addr_min + USER_MEM;
476 memset(__user_addr_min, 0, vring_size(RINGSIZE, ALIGN));
477
478 /* Set up guest side. */
479 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
480 __user_addr_min,
481 never_notify_host, never_callback_guest,
482 "guest vq");
483
484 /* Set up host side. */
485 vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN);
486 vringh_init_user(&vrh, vdev.features[0], RINGSIZE, true,
487 vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
488
489 /* No descriptor to get yet... */
490 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
491 if (err != 0)
492 errx(1, "vringh_getdesc_user: %i", err);
493
494 /* Guest puts in a descriptor. */
495 memcpy(__user_addr_max - 1, "a", 1);
496 sg_init_table(guest_sg, 1);
497 sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1);
498 sg_init_table(guest_sg+1, 1);
499 sg_set_buf(&guest_sg[1], __user_addr_max - 3, 2);
500 sgs[0] = &guest_sg[0];
501 sgs[1] = &guest_sg[1];
502
503 /* May allocate an indirect, so force it to allocate user addr */
504 __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN);
505 err = virtqueue_add_sgs(vq, sgs, 1, 1, &err, GFP_KERNEL);
506 if (err)
507 errx(1, "virtqueue_add_sgs: %i", err);
508 __kmalloc_fake = NULL;
509
510 /* Host retreives it. */
511 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
512 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
513
514 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
515 if (err != 1)
516 errx(1, "vringh_getdesc_user: %i", err);
517
518 assert(riov.used == 1);
519 assert(riov.iov[0].iov_base == __user_addr_max - 1);
520 assert(riov.iov[0].iov_len == 1);
521 if (getrange != getrange_slow) {
522 assert(wiov.used == 1);
523 assert(wiov.iov[0].iov_base == __user_addr_max - 3);
524 assert(wiov.iov[0].iov_len == 2);
525 } else {
526 assert(wiov.used == 2);
527 assert(wiov.iov[0].iov_base == __user_addr_max - 3);
528 assert(wiov.iov[0].iov_len == 1);
529 assert(wiov.iov[1].iov_base == __user_addr_max - 2);
530 assert(wiov.iov[1].iov_len == 1);
531 }
532
533 err = vringh_iov_pull_user(&riov, buf, 5);
534 if (err != 1)
535 errx(1, "vringh_iov_pull_user: %i", err);
536 assert(buf[0] == 'a');
537 assert(riov.i == 1);
538 assert(vringh_iov_pull_user(&riov, buf, 5) == 0);
539
540 memcpy(buf, "bcdef", 5);
541 err = vringh_iov_push_user(&wiov, buf, 5);
542 if (err != 2)
543 errx(1, "vringh_iov_push_user: %i", err);
544 assert(memcmp(__user_addr_max - 3, "bc", 2) == 0);
545 assert(wiov.i == wiov.used);
546 assert(vringh_iov_push_user(&wiov, buf, 5) == 0);
547
548 /* Host is done. */
549 err = vringh_complete_user(&vrh, head, err);
550 if (err != 0)
551 errx(1, "vringh_complete_user: %i", err);
552
553 /* Guest should see used token now. */
554 __kfree_ignore_start = __user_addr_min + vring_size(RINGSIZE, ALIGN);
555 __kfree_ignore_end = __kfree_ignore_start + 1;
556 ret = virtqueue_get_buf(vq, &i);
557 if (ret != &err)
558 errx(1, "virtqueue_get_buf: %p", ret);
559 assert(i == 2);
560
561 /* Guest puts in a huge descriptor. */
562 sg_init_table(guest_sg, RINGSIZE);
563 for (i = 0; i < RINGSIZE; i++) {
564 sg_set_buf(&guest_sg[i],
565 __user_addr_max - USER_MEM/4, USER_MEM/4);
566 }
567
568 /* Fill contents with recognisable garbage. */
569 for (i = 0; i < USER_MEM/4; i++)
570 ((char *)__user_addr_max - USER_MEM/4)[i] = i;
571
572 /* This will allocate an indirect, so force it to allocate user addr */
573 __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN);
574 err = virtqueue_add_outbuf(vq, guest_sg, RINGSIZE, &err, GFP_KERNEL);
575 if (err)
576 errx(1, "virtqueue_add_outbuf (large): %i", err);
577 __kmalloc_fake = NULL;
578
579 /* Host picks it up (allocates new iov). */
580 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
581 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
582
583 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
584 if (err != 1)
585 errx(1, "vringh_getdesc_user: %i", err);
586
587 assert(riov.max_num & VRINGH_IOV_ALLOCATED);
588 assert(riov.iov != host_riov);
589 if (getrange != getrange_slow)
590 assert(riov.used == RINGSIZE);
591 else
592 assert(riov.used == RINGSIZE * USER_MEM/4);
593
594 assert(!(wiov.max_num & VRINGH_IOV_ALLOCATED));
595 assert(wiov.used == 0);
596
597 /* Pull data back out (in odd chunks), should be as expected. */
598 for (i = 0; i < RINGSIZE * USER_MEM/4; i += 3) {
599 err = vringh_iov_pull_user(&riov, buf, 3);
600 if (err != 3 && i + err != RINGSIZE * USER_MEM/4)
601 errx(1, "vringh_iov_pull_user large: %i", err);
602 assert(buf[0] == (char)i);
603 assert(err < 2 || buf[1] == (char)(i + 1));
604 assert(err < 3 || buf[2] == (char)(i + 2));
605 }
606 assert(riov.i == riov.used);
607 vringh_iov_cleanup(&riov);
608 vringh_iov_cleanup(&wiov);
609
610 /* Complete using multi interface, just because we can. */
611 used[0].id = head;
612 used[0].len = 0;
613 err = vringh_complete_multi_user(&vrh, used, 1);
614 if (err)
615 errx(1, "vringh_complete_multi_user(1): %i", err);
616
617 /* Free up those descriptors. */
618 ret = virtqueue_get_buf(vq, &i);
619 if (ret != &err)
620 errx(1, "virtqueue_get_buf: %p", ret);
621
622 /* Add lots of descriptors. */
623 sg_init_table(guest_sg, 1);
624 sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1);
625 for (i = 0; i < RINGSIZE; i++) {
626 err = virtqueue_add_outbuf(vq, guest_sg, 1, &err, GFP_KERNEL);
627 if (err)
628 errx(1, "virtqueue_add_outbuf (multiple): %i", err);
629 }
630
631 /* Now get many, and consume them all at once. */
632 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
633 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
634
635 for (i = 0; i < RINGSIZE; i++) {
636 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
637 if (err != 1)
638 errx(1, "vringh_getdesc_user: %i", err);
639 used[i].id = head;
640 used[i].len = 0;
641 }
642 /* Make sure it wraps around ring, to test! */
643 assert(vrh.vring.used->idx % RINGSIZE != 0);
644 err = vringh_complete_multi_user(&vrh, used, RINGSIZE);
645 if (err)
646 errx(1, "vringh_complete_multi_user: %i", err);
647
648 /* Free those buffers. */
649 for (i = 0; i < RINGSIZE; i++) {
650 unsigned len;
651 assert(virtqueue_get_buf(vq, &len) != NULL);
652 }
653
654 /* Test weird (but legal!) indirect. */
655 if (vdev.features[0] & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
656 char *data = __user_addr_max - USER_MEM/4;
657 struct vring_desc *d = __user_addr_max - USER_MEM/2;
658 struct vring vring;
659
660 /* Force creation of direct, which we modify. */
661 vdev.features[0] &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
662 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
663 __user_addr_min,
664 never_notify_host,
665 never_callback_guest,
666 "guest vq");
667
668 sg_init_table(guest_sg, 4);
669 sg_set_buf(&guest_sg[0], d, sizeof(*d)*2);
670 sg_set_buf(&guest_sg[1], d + 2, sizeof(*d)*1);
671 sg_set_buf(&guest_sg[2], data + 6, 4);
672 sg_set_buf(&guest_sg[3], d + 3, sizeof(*d)*3);
673
674 err = virtqueue_add_outbuf(vq, guest_sg, 4, &err, GFP_KERNEL);
675 if (err)
676 errx(1, "virtqueue_add_outbuf (indirect): %i", err);
677
678 vring_init(&vring, RINGSIZE, __user_addr_min, ALIGN);
679
680 /* They're used in order, but double-check... */
681 assert(vring.desc[0].addr == (unsigned long)d);
682 assert(vring.desc[1].addr == (unsigned long)(d+2));
683 assert(vring.desc[2].addr == (unsigned long)data + 6);
684 assert(vring.desc[3].addr == (unsigned long)(d+3));
685 vring.desc[0].flags |= VRING_DESC_F_INDIRECT;
686 vring.desc[1].flags |= VRING_DESC_F_INDIRECT;
687 vring.desc[3].flags |= VRING_DESC_F_INDIRECT;
688
689 /* First indirect */
690 d[0].addr = (unsigned long)data;
691 d[0].len = 1;
692 d[0].flags = VRING_DESC_F_NEXT;
693 d[0].next = 1;
694 d[1].addr = (unsigned long)data + 1;
695 d[1].len = 2;
696 d[1].flags = 0;
697
698 /* Second indirect */
699 d[2].addr = (unsigned long)data + 3;
700 d[2].len = 3;
701 d[2].flags = 0;
702
703 /* Third indirect */
704 d[3].addr = (unsigned long)data + 10;
705 d[3].len = 5;
706 d[3].flags = VRING_DESC_F_NEXT;
707 d[3].next = 1;
708 d[4].addr = (unsigned long)data + 15;
709 d[4].len = 6;
710 d[4].flags = VRING_DESC_F_NEXT;
711 d[4].next = 2;
712 d[5].addr = (unsigned long)data + 21;
713 d[5].len = 7;
714 d[5].flags = 0;
715
716 /* Host picks it up (allocates new iov). */
717 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
718 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
719
720 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
721 if (err != 1)
722 errx(1, "vringh_getdesc_user: %i", err);
723
724 if (head != 0)
725 errx(1, "vringh_getdesc_user: head %i not 0", head);
726
727 assert(riov.max_num & VRINGH_IOV_ALLOCATED);
728 if (getrange != getrange_slow)
729 assert(riov.used == 7);
730 else
731 assert(riov.used == 28);
732 err = vringh_iov_pull_user(&riov, buf, 29);
733 assert(err == 28);
734
735 /* Data should be linear. */
736 for (i = 0; i < err; i++)
737 assert(buf[i] == i);
738 vringh_iov_cleanup(&riov);
739 }
740
741 /* Don't leak memory... */
742 vring_del_virtqueue(vq);
743 free(__user_addr_min);
744
745 return 0;
746}
1/* Simple test of virtio code, entirely in userpsace. */
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/virtio_config.h>
11#include <linux/uaccess.h>
12#include <sys/types.h>
13#include <sys/stat.h>
14#include <sys/mman.h>
15#include <sys/wait.h>
16#include <fcntl.h>
17
18#define USER_MEM (1024*1024)
19void *__user_addr_min, *__user_addr_max;
20void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
21static u64 user_addr_offset;
22
23#define RINGSIZE 256
24#define ALIGN 4096
25
26static bool never_notify_host(struct virtqueue *vq)
27{
28 abort();
29}
30
31static void never_callback_guest(struct virtqueue *vq)
32{
33 abort();
34}
35
36static bool getrange_iov(struct vringh *vrh, u64 addr, struct vringh_range *r)
37{
38 if (addr < (u64)(unsigned long)__user_addr_min - user_addr_offset)
39 return false;
40 if (addr >= (u64)(unsigned long)__user_addr_max - user_addr_offset)
41 return false;
42
43 r->start = (u64)(unsigned long)__user_addr_min - user_addr_offset;
44 r->end_incl = (u64)(unsigned long)__user_addr_max - 1 - user_addr_offset;
45 r->offset = user_addr_offset;
46 return true;
47}
48
49/* We return single byte ranges. */
50static bool getrange_slow(struct vringh *vrh, u64 addr, struct vringh_range *r)
51{
52 if (addr < (u64)(unsigned long)__user_addr_min - user_addr_offset)
53 return false;
54 if (addr >= (u64)(unsigned long)__user_addr_max - user_addr_offset)
55 return false;
56
57 r->start = addr;
58 r->end_incl = r->start;
59 r->offset = user_addr_offset;
60 return true;
61}
62
63struct guest_virtio_device {
64 struct virtio_device vdev;
65 int to_host_fd;
66 unsigned long notifies;
67};
68
69static bool parallel_notify_host(struct virtqueue *vq)
70{
71 int rc;
72 struct guest_virtio_device *gvdev;
73
74 gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev);
75 rc = write(gvdev->to_host_fd, "", 1);
76 if (rc < 0)
77 return false;
78 gvdev->notifies++;
79 return true;
80}
81
82static bool no_notify_host(struct virtqueue *vq)
83{
84 return true;
85}
86
87#define NUM_XFERS (10000000)
88
89/* We aim for two "distant" cpus. */
90static void find_cpus(unsigned int *first, unsigned int *last)
91{
92 unsigned int i;
93
94 *first = -1U;
95 *last = 0;
96 for (i = 0; i < 4096; i++) {
97 cpu_set_t set;
98 CPU_ZERO(&set);
99 CPU_SET(i, &set);
100 if (sched_setaffinity(getpid(), sizeof(set), &set) == 0) {
101 if (i < *first)
102 *first = i;
103 if (i > *last)
104 *last = i;
105 }
106 }
107}
108
109/* Opencoded version for fast mode */
110static inline int vringh_get_head(struct vringh *vrh, u16 *head)
111{
112 u16 avail_idx, i;
113 int err;
114
115 err = get_user(avail_idx, &vrh->vring.avail->idx);
116 if (err)
117 return err;
118
119 if (vrh->last_avail_idx == avail_idx)
120 return 0;
121
122 /* Only get avail ring entries after they have been exposed by guest. */
123 virtio_rmb(vrh->weak_barriers);
124
125 i = vrh->last_avail_idx & (vrh->vring.num - 1);
126
127 err = get_user(*head, &vrh->vring.avail->ring[i]);
128 if (err)
129 return err;
130
131 vrh->last_avail_idx++;
132 return 1;
133}
134
135static int parallel_test(u64 features,
136 bool (*getrange)(struct vringh *vrh,
137 u64 addr, struct vringh_range *r),
138 bool fast_vringh)
139{
140 void *host_map, *guest_map;
141 int fd, mapsize, to_guest[2], to_host[2];
142 unsigned long xfers = 0, notifies = 0, receives = 0;
143 unsigned int first_cpu, last_cpu;
144 cpu_set_t cpu_set;
145 char buf[128];
146
147 /* Create real file to mmap. */
148 fd = open("/tmp/vringh_test-file", O_RDWR|O_CREAT|O_TRUNC, 0600);
149 if (fd < 0)
150 err(1, "Opening /tmp/vringh_test-file");
151
152 /* Extra room at the end for some data, and indirects */
153 mapsize = vring_size(RINGSIZE, ALIGN)
154 + RINGSIZE * 2 * sizeof(int)
155 + RINGSIZE * 6 * sizeof(struct vring_desc);
156 mapsize = (mapsize + getpagesize() - 1) & ~(getpagesize() - 1);
157 ftruncate(fd, mapsize);
158
159 /* Parent and child use separate addresses, to check our mapping logic! */
160 host_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
161 guest_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
162
163 pipe(to_guest);
164 pipe(to_host);
165
166 CPU_ZERO(&cpu_set);
167 find_cpus(&first_cpu, &last_cpu);
168 printf("Using CPUS %u and %u\n", first_cpu, last_cpu);
169 fflush(stdout);
170
171 if (fork() != 0) {
172 struct vringh vrh;
173 int status, err, rlen = 0;
174 char rbuf[5];
175
176 /* We are the host: never access guest addresses! */
177 munmap(guest_map, mapsize);
178
179 __user_addr_min = host_map;
180 __user_addr_max = __user_addr_min + mapsize;
181 user_addr_offset = host_map - guest_map;
182 assert(user_addr_offset);
183
184 close(to_guest[0]);
185 close(to_host[1]);
186
187 vring_init(&vrh.vring, RINGSIZE, host_map, ALIGN);
188 vringh_init_user(&vrh, features, RINGSIZE, true,
189 vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
190 CPU_SET(first_cpu, &cpu_set);
191 if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
192 errx(1, "Could not set affinity to cpu %u", first_cpu);
193
194 while (xfers < NUM_XFERS) {
195 struct iovec host_riov[2], host_wiov[2];
196 struct vringh_iov riov, wiov;
197 u16 head, written;
198
199 if (fast_vringh) {
200 for (;;) {
201 err = vringh_get_head(&vrh, &head);
202 if (err != 0)
203 break;
204 err = vringh_need_notify_user(&vrh);
205 if (err < 0)
206 errx(1, "vringh_need_notify_user: %i",
207 err);
208 if (err) {
209 write(to_guest[1], "", 1);
210 notifies++;
211 }
212 }
213 if (err != 1)
214 errx(1, "vringh_get_head");
215 written = 0;
216 goto complete;
217 } else {
218 vringh_iov_init(&riov,
219 host_riov,
220 ARRAY_SIZE(host_riov));
221 vringh_iov_init(&wiov,
222 host_wiov,
223 ARRAY_SIZE(host_wiov));
224
225 err = vringh_getdesc_user(&vrh, &riov, &wiov,
226 getrange, &head);
227 }
228 if (err == 0) {
229 err = vringh_need_notify_user(&vrh);
230 if (err < 0)
231 errx(1, "vringh_need_notify_user: %i",
232 err);
233 if (err) {
234 write(to_guest[1], "", 1);
235 notifies++;
236 }
237
238 if (!vringh_notify_enable_user(&vrh))
239 continue;
240
241 /* Swallow all notifies at once. */
242 if (read(to_host[0], buf, sizeof(buf)) < 1)
243 break;
244
245 vringh_notify_disable_user(&vrh);
246 receives++;
247 continue;
248 }
249 if (err != 1)
250 errx(1, "vringh_getdesc_user: %i", err);
251
252 /* We simply copy bytes. */
253 if (riov.used) {
254 rlen = vringh_iov_pull_user(&riov, rbuf,
255 sizeof(rbuf));
256 if (rlen != 4)
257 errx(1, "vringh_iov_pull_user: %i",
258 rlen);
259 assert(riov.i == riov.used);
260 written = 0;
261 } else {
262 err = vringh_iov_push_user(&wiov, rbuf, rlen);
263 if (err != rlen)
264 errx(1, "vringh_iov_push_user: %i",
265 err);
266 assert(wiov.i == wiov.used);
267 written = err;
268 }
269 complete:
270 xfers++;
271
272 err = vringh_complete_user(&vrh, head, written);
273 if (err != 0)
274 errx(1, "vringh_complete_user: %i", err);
275 }
276
277 err = vringh_need_notify_user(&vrh);
278 if (err < 0)
279 errx(1, "vringh_need_notify_user: %i", err);
280 if (err) {
281 write(to_guest[1], "", 1);
282 notifies++;
283 }
284 wait(&status);
285 if (!WIFEXITED(status))
286 errx(1, "Child died with signal %i?", WTERMSIG(status));
287 if (WEXITSTATUS(status) != 0)
288 errx(1, "Child exited %i?", WEXITSTATUS(status));
289 printf("Host: notified %lu, pinged %lu\n", notifies, receives);
290 return 0;
291 } else {
292 struct guest_virtio_device gvdev;
293 struct virtqueue *vq;
294 unsigned int *data;
295 struct vring_desc *indirects;
296 unsigned int finished = 0;
297
298 /* We pass sg[]s pointing into here, but we need RINGSIZE+1 */
299 data = guest_map + vring_size(RINGSIZE, ALIGN);
300 indirects = (void *)data + (RINGSIZE + 1) * 2 * sizeof(int);
301
302 /* We are the guest. */
303 munmap(host_map, mapsize);
304
305 close(to_guest[1]);
306 close(to_host[0]);
307
308 gvdev.vdev.features = features;
309 gvdev.to_host_fd = to_host[1];
310 gvdev.notifies = 0;
311
312 CPU_SET(first_cpu, &cpu_set);
313 if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
314 err(1, "Could not set affinity to cpu %u", first_cpu);
315
316 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &gvdev.vdev, true,
317 guest_map, fast_vringh ? no_notify_host
318 : parallel_notify_host,
319 never_callback_guest, "guest vq");
320
321 /* Don't kfree indirects. */
322 __kfree_ignore_start = indirects;
323 __kfree_ignore_end = indirects + RINGSIZE * 6;
324
325 while (xfers < NUM_XFERS) {
326 struct scatterlist sg[4];
327 unsigned int num_sg, len;
328 int *dbuf, err;
329 bool output = !(xfers % 2);
330
331 /* Consume bufs. */
332 while ((dbuf = virtqueue_get_buf(vq, &len)) != NULL) {
333 if (len == 4)
334 assert(*dbuf == finished - 1);
335 else if (!fast_vringh)
336 assert(*dbuf == finished);
337 finished++;
338 }
339
340 /* Produce a buffer. */
341 dbuf = data + (xfers % (RINGSIZE + 1));
342
343 if (output)
344 *dbuf = xfers;
345 else
346 *dbuf = -1;
347
348 switch ((xfers / sizeof(*dbuf)) % 4) {
349 case 0:
350 /* Nasty three-element sg list. */
351 sg_init_table(sg, num_sg = 3);
352 sg_set_buf(&sg[0], (void *)dbuf, 1);
353 sg_set_buf(&sg[1], (void *)dbuf + 1, 2);
354 sg_set_buf(&sg[2], (void *)dbuf + 3, 1);
355 break;
356 case 1:
357 sg_init_table(sg, num_sg = 2);
358 sg_set_buf(&sg[0], (void *)dbuf, 1);
359 sg_set_buf(&sg[1], (void *)dbuf + 1, 3);
360 break;
361 case 2:
362 sg_init_table(sg, num_sg = 1);
363 sg_set_buf(&sg[0], (void *)dbuf, 4);
364 break;
365 case 3:
366 sg_init_table(sg, num_sg = 4);
367 sg_set_buf(&sg[0], (void *)dbuf, 1);
368 sg_set_buf(&sg[1], (void *)dbuf + 1, 1);
369 sg_set_buf(&sg[2], (void *)dbuf + 2, 1);
370 sg_set_buf(&sg[3], (void *)dbuf + 3, 1);
371 break;
372 }
373
374 /* May allocate an indirect, so force it to allocate
375 * user addr */
376 __kmalloc_fake = indirects + (xfers % RINGSIZE) * 4;
377 if (output)
378 err = virtqueue_add_outbuf(vq, sg, num_sg, dbuf,
379 GFP_KERNEL);
380 else
381 err = virtqueue_add_inbuf(vq, sg, num_sg,
382 dbuf, GFP_KERNEL);
383
384 if (err == -ENOSPC) {
385 if (!virtqueue_enable_cb_delayed(vq))
386 continue;
387 /* Swallow all notifies at once. */
388 if (read(to_guest[0], buf, sizeof(buf)) < 1)
389 break;
390
391 receives++;
392 virtqueue_disable_cb(vq);
393 continue;
394 }
395
396 if (err)
397 errx(1, "virtqueue_add_in/outbuf: %i", err);
398
399 xfers++;
400 virtqueue_kick(vq);
401 }
402
403 /* Any extra? */
404 while (finished != xfers) {
405 int *dbuf;
406 unsigned int len;
407
408 /* Consume bufs. */
409 dbuf = virtqueue_get_buf(vq, &len);
410 if (dbuf) {
411 if (len == 4)
412 assert(*dbuf == finished - 1);
413 else
414 assert(len == 0);
415 finished++;
416 continue;
417 }
418
419 if (!virtqueue_enable_cb_delayed(vq))
420 continue;
421 if (read(to_guest[0], buf, sizeof(buf)) < 1)
422 break;
423
424 receives++;
425 virtqueue_disable_cb(vq);
426 }
427
428 printf("Guest: notified %lu, pinged %lu\n",
429 gvdev.notifies, receives);
430 vring_del_virtqueue(vq);
431 return 0;
432 }
433}
434
435int main(int argc, char *argv[])
436{
437 struct virtio_device vdev;
438 struct virtqueue *vq;
439 struct vringh vrh;
440 struct scatterlist guest_sg[RINGSIZE], *sgs[2];
441 struct iovec host_riov[2], host_wiov[2];
442 struct vringh_iov riov, wiov;
443 struct vring_used_elem used[RINGSIZE];
444 char buf[28];
445 u16 head;
446 int err;
447 unsigned i;
448 void *ret;
449 bool (*getrange)(struct vringh *vrh, u64 addr, struct vringh_range *r);
450 bool fast_vringh = false, parallel = false;
451
452 getrange = getrange_iov;
453 vdev.features = 0;
454
455 while (argv[1]) {
456 if (strcmp(argv[1], "--indirect") == 0)
457 __virtio_set_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
458 else if (strcmp(argv[1], "--eventidx") == 0)
459 __virtio_set_bit(&vdev, VIRTIO_RING_F_EVENT_IDX);
460 else if (strcmp(argv[1], "--virtio-1") == 0)
461 __virtio_set_bit(&vdev, VIRTIO_F_VERSION_1);
462 else if (strcmp(argv[1], "--slow-range") == 0)
463 getrange = getrange_slow;
464 else if (strcmp(argv[1], "--fast-vringh") == 0)
465 fast_vringh = true;
466 else if (strcmp(argv[1], "--parallel") == 0)
467 parallel = true;
468 else
469 errx(1, "Unknown arg %s", argv[1]);
470 argv++;
471 }
472
473 if (parallel)
474 return parallel_test(vdev.features, getrange, fast_vringh);
475
476 if (posix_memalign(&__user_addr_min, PAGE_SIZE, USER_MEM) != 0)
477 abort();
478 __user_addr_max = __user_addr_min + USER_MEM;
479 memset(__user_addr_min, 0, vring_size(RINGSIZE, ALIGN));
480
481 /* Set up guest side. */
482 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
483 __user_addr_min,
484 never_notify_host, never_callback_guest,
485 "guest vq");
486
487 /* Set up host side. */
488 vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN);
489 vringh_init_user(&vrh, vdev.features, RINGSIZE, true,
490 vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
491
492 /* No descriptor to get yet... */
493 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
494 if (err != 0)
495 errx(1, "vringh_getdesc_user: %i", err);
496
497 /* Guest puts in a descriptor. */
498 memcpy(__user_addr_max - 1, "a", 1);
499 sg_init_table(guest_sg, 1);
500 sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1);
501 sg_init_table(guest_sg+1, 1);
502 sg_set_buf(&guest_sg[1], __user_addr_max - 3, 2);
503 sgs[0] = &guest_sg[0];
504 sgs[1] = &guest_sg[1];
505
506 /* May allocate an indirect, so force it to allocate user addr */
507 __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN);
508 err = virtqueue_add_sgs(vq, sgs, 1, 1, &err, GFP_KERNEL);
509 if (err)
510 errx(1, "virtqueue_add_sgs: %i", err);
511 __kmalloc_fake = NULL;
512
513 /* Host retreives it. */
514 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
515 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
516
517 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
518 if (err != 1)
519 errx(1, "vringh_getdesc_user: %i", err);
520
521 assert(riov.used == 1);
522 assert(riov.iov[0].iov_base == __user_addr_max - 1);
523 assert(riov.iov[0].iov_len == 1);
524 if (getrange != getrange_slow) {
525 assert(wiov.used == 1);
526 assert(wiov.iov[0].iov_base == __user_addr_max - 3);
527 assert(wiov.iov[0].iov_len == 2);
528 } else {
529 assert(wiov.used == 2);
530 assert(wiov.iov[0].iov_base == __user_addr_max - 3);
531 assert(wiov.iov[0].iov_len == 1);
532 assert(wiov.iov[1].iov_base == __user_addr_max - 2);
533 assert(wiov.iov[1].iov_len == 1);
534 }
535
536 err = vringh_iov_pull_user(&riov, buf, 5);
537 if (err != 1)
538 errx(1, "vringh_iov_pull_user: %i", err);
539 assert(buf[0] == 'a');
540 assert(riov.i == 1);
541 assert(vringh_iov_pull_user(&riov, buf, 5) == 0);
542
543 memcpy(buf, "bcdef", 5);
544 err = vringh_iov_push_user(&wiov, buf, 5);
545 if (err != 2)
546 errx(1, "vringh_iov_push_user: %i", err);
547 assert(memcmp(__user_addr_max - 3, "bc", 2) == 0);
548 assert(wiov.i == wiov.used);
549 assert(vringh_iov_push_user(&wiov, buf, 5) == 0);
550
551 /* Host is done. */
552 err = vringh_complete_user(&vrh, head, err);
553 if (err != 0)
554 errx(1, "vringh_complete_user: %i", err);
555
556 /* Guest should see used token now. */
557 __kfree_ignore_start = __user_addr_min + vring_size(RINGSIZE, ALIGN);
558 __kfree_ignore_end = __kfree_ignore_start + 1;
559 ret = virtqueue_get_buf(vq, &i);
560 if (ret != &err)
561 errx(1, "virtqueue_get_buf: %p", ret);
562 assert(i == 2);
563
564 /* Guest puts in a huge descriptor. */
565 sg_init_table(guest_sg, RINGSIZE);
566 for (i = 0; i < RINGSIZE; i++) {
567 sg_set_buf(&guest_sg[i],
568 __user_addr_max - USER_MEM/4, USER_MEM/4);
569 }
570
571 /* Fill contents with recognisable garbage. */
572 for (i = 0; i < USER_MEM/4; i++)
573 ((char *)__user_addr_max - USER_MEM/4)[i] = i;
574
575 /* This will allocate an indirect, so force it to allocate user addr */
576 __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN);
577 err = virtqueue_add_outbuf(vq, guest_sg, RINGSIZE, &err, GFP_KERNEL);
578 if (err)
579 errx(1, "virtqueue_add_outbuf (large): %i", err);
580 __kmalloc_fake = NULL;
581
582 /* Host picks it up (allocates new iov). */
583 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
584 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
585
586 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
587 if (err != 1)
588 errx(1, "vringh_getdesc_user: %i", err);
589
590 assert(riov.max_num & VRINGH_IOV_ALLOCATED);
591 assert(riov.iov != host_riov);
592 if (getrange != getrange_slow)
593 assert(riov.used == RINGSIZE);
594 else
595 assert(riov.used == RINGSIZE * USER_MEM/4);
596
597 assert(!(wiov.max_num & VRINGH_IOV_ALLOCATED));
598 assert(wiov.used == 0);
599
600 /* Pull data back out (in odd chunks), should be as expected. */
601 for (i = 0; i < RINGSIZE * USER_MEM/4; i += 3) {
602 err = vringh_iov_pull_user(&riov, buf, 3);
603 if (err != 3 && i + err != RINGSIZE * USER_MEM/4)
604 errx(1, "vringh_iov_pull_user large: %i", err);
605 assert(buf[0] == (char)i);
606 assert(err < 2 || buf[1] == (char)(i + 1));
607 assert(err < 3 || buf[2] == (char)(i + 2));
608 }
609 assert(riov.i == riov.used);
610 vringh_iov_cleanup(&riov);
611 vringh_iov_cleanup(&wiov);
612
613 /* Complete using multi interface, just because we can. */
614 used[0].id = head;
615 used[0].len = 0;
616 err = vringh_complete_multi_user(&vrh, used, 1);
617 if (err)
618 errx(1, "vringh_complete_multi_user(1): %i", err);
619
620 /* Free up those descriptors. */
621 ret = virtqueue_get_buf(vq, &i);
622 if (ret != &err)
623 errx(1, "virtqueue_get_buf: %p", ret);
624
625 /* Add lots of descriptors. */
626 sg_init_table(guest_sg, 1);
627 sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1);
628 for (i = 0; i < RINGSIZE; i++) {
629 err = virtqueue_add_outbuf(vq, guest_sg, 1, &err, GFP_KERNEL);
630 if (err)
631 errx(1, "virtqueue_add_outbuf (multiple): %i", err);
632 }
633
634 /* Now get many, and consume them all at once. */
635 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
636 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
637
638 for (i = 0; i < RINGSIZE; i++) {
639 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
640 if (err != 1)
641 errx(1, "vringh_getdesc_user: %i", err);
642 used[i].id = head;
643 used[i].len = 0;
644 }
645 /* Make sure it wraps around ring, to test! */
646 assert(vrh.vring.used->idx % RINGSIZE != 0);
647 err = vringh_complete_multi_user(&vrh, used, RINGSIZE);
648 if (err)
649 errx(1, "vringh_complete_multi_user: %i", err);
650
651 /* Free those buffers. */
652 for (i = 0; i < RINGSIZE; i++) {
653 unsigned len;
654 assert(virtqueue_get_buf(vq, &len) != NULL);
655 }
656
657 /* Test weird (but legal!) indirect. */
658 if (__virtio_test_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
659 char *data = __user_addr_max - USER_MEM/4;
660 struct vring_desc *d = __user_addr_max - USER_MEM/2;
661 struct vring vring;
662
663 /* Force creation of direct, which we modify. */
664 __virtio_clear_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
665 vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
666 __user_addr_min,
667 never_notify_host,
668 never_callback_guest,
669 "guest vq");
670
671 sg_init_table(guest_sg, 4);
672 sg_set_buf(&guest_sg[0], d, sizeof(*d)*2);
673 sg_set_buf(&guest_sg[1], d + 2, sizeof(*d)*1);
674 sg_set_buf(&guest_sg[2], data + 6, 4);
675 sg_set_buf(&guest_sg[3], d + 3, sizeof(*d)*3);
676
677 err = virtqueue_add_outbuf(vq, guest_sg, 4, &err, GFP_KERNEL);
678 if (err)
679 errx(1, "virtqueue_add_outbuf (indirect): %i", err);
680
681 vring_init(&vring, RINGSIZE, __user_addr_min, ALIGN);
682
683 /* They're used in order, but double-check... */
684 assert(vring.desc[0].addr == (unsigned long)d);
685 assert(vring.desc[1].addr == (unsigned long)(d+2));
686 assert(vring.desc[2].addr == (unsigned long)data + 6);
687 assert(vring.desc[3].addr == (unsigned long)(d+3));
688 vring.desc[0].flags |= VRING_DESC_F_INDIRECT;
689 vring.desc[1].flags |= VRING_DESC_F_INDIRECT;
690 vring.desc[3].flags |= VRING_DESC_F_INDIRECT;
691
692 /* First indirect */
693 d[0].addr = (unsigned long)data;
694 d[0].len = 1;
695 d[0].flags = VRING_DESC_F_NEXT;
696 d[0].next = 1;
697 d[1].addr = (unsigned long)data + 1;
698 d[1].len = 2;
699 d[1].flags = 0;
700
701 /* Second indirect */
702 d[2].addr = (unsigned long)data + 3;
703 d[2].len = 3;
704 d[2].flags = 0;
705
706 /* Third indirect */
707 d[3].addr = (unsigned long)data + 10;
708 d[3].len = 5;
709 d[3].flags = VRING_DESC_F_NEXT;
710 d[3].next = 1;
711 d[4].addr = (unsigned long)data + 15;
712 d[4].len = 6;
713 d[4].flags = VRING_DESC_F_NEXT;
714 d[4].next = 2;
715 d[5].addr = (unsigned long)data + 21;
716 d[5].len = 7;
717 d[5].flags = 0;
718
719 /* Host picks it up (allocates new iov). */
720 vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov));
721 vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov));
722
723 err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head);
724 if (err != 1)
725 errx(1, "vringh_getdesc_user: %i", err);
726
727 if (head != 0)
728 errx(1, "vringh_getdesc_user: head %i not 0", head);
729
730 assert(riov.max_num & VRINGH_IOV_ALLOCATED);
731 if (getrange != getrange_slow)
732 assert(riov.used == 7);
733 else
734 assert(riov.used == 28);
735 err = vringh_iov_pull_user(&riov, buf, 29);
736 assert(err == 28);
737
738 /* Data should be linear. */
739 for (i = 0; i < err; i++)
740 assert(buf[i] == i);
741 vringh_iov_cleanup(&riov);
742 }
743
744 /* Don't leak memory... */
745 vring_del_virtqueue(vq);
746 free(__user_addr_min);
747
748 return 0;
749}