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> | |
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) | |
18 | void *__user_addr_min, *__user_addr_max; | |
19 | void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end; | |
20 | static u64 user_addr_offset; | |
21 | ||
22 | #define RINGSIZE 256 | |
23 | #define ALIGN 4096 | |
24 | ||
46f9c2b9 | 25 | static bool never_notify_host(struct virtqueue *vq) |
1515c5ce RR |
26 | { |
27 | abort(); | |
28 | } | |
29 | ||
30 | static void never_callback_guest(struct virtqueue *vq) | |
31 | { | |
32 | abort(); | |
33 | } | |
34 | ||
35 | static 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. */ | |
49 | static 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 | ||
62 | struct guest_virtio_device { | |
63 | struct virtio_device vdev; | |
64 | int to_host_fd; | |
65 | unsigned long notifies; | |
66 | }; | |
67 | ||
46f9c2b9 | 68 | static bool parallel_notify_host(struct virtqueue *vq) |
1515c5ce | 69 | { |
46f9c2b9 | 70 | int rc; |
1515c5ce RR |
71 | struct guest_virtio_device *gvdev; |
72 | ||
73 | gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev); | |
46f9c2b9 HG |
74 | rc = write(gvdev->to_host_fd, "", 1); |
75 | if (rc < 0) | |
76 | return false; | |
1515c5ce | 77 | gvdev->notifies++; |
46f9c2b9 | 78 | return true; |
1515c5ce RR |
79 | } |
80 | ||
46f9c2b9 | 81 | static bool no_notify_host(struct virtqueue *vq) |
1515c5ce | 82 | { |
46f9c2b9 | 83 | return true; |
1515c5ce RR |
84 | } |
85 | ||
86 | #define NUM_XFERS (10000000) | |
87 | ||
88 | /* We aim for two "distant" cpus. */ | |
89 | static 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 */ | |
109 | static 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 | ||
134 | static 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) | |
e538ebaf RR |
377 | err = virtqueue_add_outbuf(vq, sg, num_sg, dbuf, |
378 | GFP_KERNEL); | |
1515c5ce | 379 | else |
e538ebaf RR |
380 | err = virtqueue_add_inbuf(vq, sg, num_sg, |
381 | dbuf, GFP_KERNEL); | |
1515c5ce RR |
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) | |
cf994e0a | 396 | errx(1, "virtqueue_add_in/outbuf: %i", err); |
1515c5ce RR |
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 | ||
434 | int main(int argc, char *argv[]) | |
435 | { | |
436 | struct virtio_device vdev; | |
437 | struct virtqueue *vq; | |
438 | struct vringh vrh; | |
cf994e0a | 439 | struct scatterlist guest_sg[RINGSIZE], *sgs[2]; |
1515c5ce RR |
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); | |
cf994e0a RR |
500 | sgs[0] = &guest_sg[0]; |
501 | sgs[1] = &guest_sg[1]; | |
1515c5ce RR |
502 | |
503 | /* May allocate an indirect, so force it to allocate user addr */ | |
504 | __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN); | |
cf994e0a | 505 | err = virtqueue_add_sgs(vq, sgs, 1, 1, &err, GFP_KERNEL); |
1515c5ce | 506 | if (err) |
cf994e0a | 507 | errx(1, "virtqueue_add_sgs: %i", err); |
1515c5ce RR |
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); | |
cf994e0a | 574 | err = virtqueue_add_outbuf(vq, guest_sg, RINGSIZE, &err, GFP_KERNEL); |
1515c5ce | 575 | if (err) |
cf994e0a | 576 | errx(1, "virtqueue_add_outbuf (large): %i", err); |
1515c5ce RR |
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++) { | |
cf994e0a | 626 | err = virtqueue_add_outbuf(vq, guest_sg, 1, &err, GFP_KERNEL); |
1515c5ce | 627 | if (err) |
cf994e0a | 628 | errx(1, "virtqueue_add_outbuf (multiple): %i", err); |
1515c5ce RR |
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 | ||
cf994e0a | 674 | err = virtqueue_add_outbuf(vq, guest_sg, 4, &err, GFP_KERNEL); |
1515c5ce | 675 | if (err) |
cf994e0a | 676 | errx(1, "virtqueue_add_outbuf (indirect): %i", err); |
1515c5ce RR |
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 | } |