Commit | Line | Data |
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1515c5ce RR |
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> | |
2eaa614b | 10 | #include <linux/virtio_config.h> |
1515c5ce RR |
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) | |
19 | void *__user_addr_min, *__user_addr_max; | |
20 | void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end; | |
21 | static u64 user_addr_offset; | |
22 | ||
23 | #define RINGSIZE 256 | |
24 | #define ALIGN 4096 | |
25 | ||
46f9c2b9 | 26 | static bool never_notify_host(struct virtqueue *vq) |
1515c5ce RR |
27 | { |
28 | abort(); | |
29 | } | |
30 | ||
31 | static void never_callback_guest(struct virtqueue *vq) | |
32 | { | |
33 | abort(); | |
34 | } | |
35 | ||
36 | static 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. */ | |
50 | static 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 | ||
63 | struct guest_virtio_device { | |
64 | struct virtio_device vdev; | |
65 | int to_host_fd; | |
66 | unsigned long notifies; | |
67 | }; | |
68 | ||
46f9c2b9 | 69 | static bool parallel_notify_host(struct virtqueue *vq) |
1515c5ce | 70 | { |
46f9c2b9 | 71 | int rc; |
1515c5ce RR |
72 | struct guest_virtio_device *gvdev; |
73 | ||
74 | gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev); | |
46f9c2b9 HG |
75 | rc = write(gvdev->to_host_fd, "", 1); |
76 | if (rc < 0) | |
77 | return false; | |
1515c5ce | 78 | gvdev->notifies++; |
46f9c2b9 | 79 | return true; |
1515c5ce RR |
80 | } |
81 | ||
46f9c2b9 | 82 | static bool no_notify_host(struct virtqueue *vq) |
1515c5ce | 83 | { |
46f9c2b9 | 84 | return true; |
1515c5ce RR |
85 | } |
86 | ||
87 | #define NUM_XFERS (10000000) | |
88 | ||
89 | /* We aim for two "distant" cpus. */ | |
90 | static 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 */ | |
110 | static 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 | ||
e3edf032 | 135 | static int parallel_test(u64 features, |
1515c5ce RR |
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 | ||
e16e12be | 308 | gvdev.vdev.features = features; |
1515c5ce RR |
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) | |
e538ebaf RR |
378 | err = virtqueue_add_outbuf(vq, sg, num_sg, dbuf, |
379 | GFP_KERNEL); | |
1515c5ce | 380 | else |
e538ebaf RR |
381 | err = virtqueue_add_inbuf(vq, sg, num_sg, |
382 | dbuf, GFP_KERNEL); | |
1515c5ce RR |
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) | |
cf994e0a | 397 | errx(1, "virtqueue_add_in/outbuf: %i", err); |
1515c5ce RR |
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 | ||
435 | int main(int argc, char *argv[]) | |
436 | { | |
437 | struct virtio_device vdev; | |
438 | struct virtqueue *vq; | |
439 | struct vringh vrh; | |
cf994e0a | 440 | struct scatterlist guest_sg[RINGSIZE], *sgs[2]; |
1515c5ce RR |
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; | |
e16e12be | 453 | vdev.features = 0; |
1515c5ce RR |
454 | |
455 | while (argv[1]) { | |
456 | if (strcmp(argv[1], "--indirect") == 0) | |
e16e12be | 457 | __virtio_set_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC); |
1515c5ce | 458 | else if (strcmp(argv[1], "--eventidx") == 0) |
e16e12be | 459 | __virtio_set_bit(&vdev, VIRTIO_RING_F_EVENT_IDX); |
8dc32b29 MT |
460 | else if (strcmp(argv[1], "--virtio-1") == 0) |
461 | __virtio_set_bit(&vdev, VIRTIO_F_VERSION_1); | |
1515c5ce RR |
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) | |
e16e12be | 474 | return parallel_test(vdev.features, getrange, fast_vringh); |
1515c5ce RR |
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); | |
e16e12be | 489 | vringh_init_user(&vrh, vdev.features, RINGSIZE, true, |
1515c5ce RR |
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); | |
cf994e0a RR |
503 | sgs[0] = &guest_sg[0]; |
504 | sgs[1] = &guest_sg[1]; | |
1515c5ce RR |
505 | |
506 | /* May allocate an indirect, so force it to allocate user addr */ | |
507 | __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN); | |
cf994e0a | 508 | err = virtqueue_add_sgs(vq, sgs, 1, 1, &err, GFP_KERNEL); |
1515c5ce | 509 | if (err) |
cf994e0a | 510 | errx(1, "virtqueue_add_sgs: %i", err); |
1515c5ce RR |
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); | |
cf994e0a | 577 | err = virtqueue_add_outbuf(vq, guest_sg, RINGSIZE, &err, GFP_KERNEL); |
1515c5ce | 578 | if (err) |
cf994e0a | 579 | errx(1, "virtqueue_add_outbuf (large): %i", err); |
1515c5ce RR |
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++) { | |
cf994e0a | 629 | err = virtqueue_add_outbuf(vq, guest_sg, 1, &err, GFP_KERNEL); |
1515c5ce | 630 | if (err) |
cf994e0a | 631 | errx(1, "virtqueue_add_outbuf (multiple): %i", err); |
1515c5ce RR |
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. */ | |
e16e12be | 658 | if (__virtio_test_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC)) { |
1515c5ce RR |
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. */ | |
e16e12be | 664 | __virtio_clear_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC); |
1515c5ce RR |
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 | ||
cf994e0a | 677 | err = virtqueue_add_outbuf(vq, guest_sg, 4, &err, GFP_KERNEL); |
1515c5ce | 678 | if (err) |
cf994e0a | 679 | errx(1, "virtqueue_add_outbuf (indirect): %i", err); |
1515c5ce RR |
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 | } |