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1 | /* | |
2 | * Virtio Support | |
3 | * | |
4 | * Copyright IBM, Corp. 2007 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "qemu/osdep.h" | |
15 | #include "qapi/error.h" | |
16 | #include "qemu-common.h" | |
17 | #include "cpu.h" | |
18 | #include "trace.h" | |
19 | #include "exec/address-spaces.h" | |
20 | #include "qemu/error-report.h" | |
21 | #include "hw/virtio/virtio.h" | |
22 | #include "qemu/atomic.h" | |
23 | #include "hw/virtio/virtio-bus.h" | |
24 | #include "migration/migration.h" | |
25 | #include "hw/virtio/virtio-access.h" | |
26 | ||
27 | /* | |
28 | * The alignment to use between consumer and producer parts of vring. | |
29 | * x86 pagesize again. This is the default, used by transports like PCI | |
30 | * which don't provide a means for the guest to tell the host the alignment. | |
31 | */ | |
32 | #define VIRTIO_PCI_VRING_ALIGN 4096 | |
33 | ||
34 | typedef struct VRingDesc | |
35 | { | |
36 | uint64_t addr; | |
37 | uint32_t len; | |
38 | uint16_t flags; | |
39 | uint16_t next; | |
40 | } VRingDesc; | |
41 | ||
42 | typedef struct VRingAvail | |
43 | { | |
44 | uint16_t flags; | |
45 | uint16_t idx; | |
46 | uint16_t ring[0]; | |
47 | } VRingAvail; | |
48 | ||
49 | typedef struct VRingUsedElem | |
50 | { | |
51 | uint32_t id; | |
52 | uint32_t len; | |
53 | } VRingUsedElem; | |
54 | ||
55 | typedef struct VRingUsed | |
56 | { | |
57 | uint16_t flags; | |
58 | uint16_t idx; | |
59 | VRingUsedElem ring[0]; | |
60 | } VRingUsed; | |
61 | ||
62 | typedef struct VRing | |
63 | { | |
64 | unsigned int num; | |
65 | unsigned int num_default; | |
66 | unsigned int align; | |
67 | hwaddr desc; | |
68 | hwaddr avail; | |
69 | hwaddr used; | |
70 | } VRing; | |
71 | ||
72 | struct VirtQueue | |
73 | { | |
74 | VRing vring; | |
75 | ||
76 | /* Next head to pop */ | |
77 | uint16_t last_avail_idx; | |
78 | ||
79 | /* Last avail_idx read from VQ. */ | |
80 | uint16_t shadow_avail_idx; | |
81 | ||
82 | uint16_t used_idx; | |
83 | ||
84 | /* Last used index value we have signalled on */ | |
85 | uint16_t signalled_used; | |
86 | ||
87 | /* Last used index value we have signalled on */ | |
88 | bool signalled_used_valid; | |
89 | ||
90 | /* Notification enabled? */ | |
91 | bool notification; | |
92 | ||
93 | uint16_t queue_index; | |
94 | ||
95 | int inuse; | |
96 | ||
97 | uint16_t vector; | |
98 | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq); | |
99 | void (*handle_aio_output)(VirtIODevice *vdev, VirtQueue *vq); | |
100 | VirtIODevice *vdev; | |
101 | EventNotifier guest_notifier; | |
102 | EventNotifier host_notifier; | |
103 | QLIST_ENTRY(VirtQueue) node; | |
104 | }; | |
105 | ||
106 | /* virt queue functions */ | |
107 | void virtio_queue_update_rings(VirtIODevice *vdev, int n) | |
108 | { | |
109 | VRing *vring = &vdev->vq[n].vring; | |
110 | ||
111 | if (!vring->desc) { | |
112 | /* not yet setup -> nothing to do */ | |
113 | return; | |
114 | } | |
115 | vring->avail = vring->desc + vring->num * sizeof(VRingDesc); | |
116 | vring->used = vring_align(vring->avail + | |
117 | offsetof(VRingAvail, ring[vring->num]), | |
118 | vring->align); | |
119 | } | |
120 | ||
121 | static void vring_desc_read(VirtIODevice *vdev, VRingDesc *desc, | |
122 | hwaddr desc_pa, int i) | |
123 | { | |
124 | address_space_read(&address_space_memory, desc_pa + i * sizeof(VRingDesc), | |
125 | MEMTXATTRS_UNSPECIFIED, (void *)desc, sizeof(VRingDesc)); | |
126 | virtio_tswap64s(vdev, &desc->addr); | |
127 | virtio_tswap32s(vdev, &desc->len); | |
128 | virtio_tswap16s(vdev, &desc->flags); | |
129 | virtio_tswap16s(vdev, &desc->next); | |
130 | } | |
131 | ||
132 | static inline uint16_t vring_avail_flags(VirtQueue *vq) | |
133 | { | |
134 | hwaddr pa; | |
135 | pa = vq->vring.avail + offsetof(VRingAvail, flags); | |
136 | return virtio_lduw_phys(vq->vdev, pa); | |
137 | } | |
138 | ||
139 | static inline uint16_t vring_avail_idx(VirtQueue *vq) | |
140 | { | |
141 | hwaddr pa; | |
142 | pa = vq->vring.avail + offsetof(VRingAvail, idx); | |
143 | vq->shadow_avail_idx = virtio_lduw_phys(vq->vdev, pa); | |
144 | return vq->shadow_avail_idx; | |
145 | } | |
146 | ||
147 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) | |
148 | { | |
149 | hwaddr pa; | |
150 | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); | |
151 | return virtio_lduw_phys(vq->vdev, pa); | |
152 | } | |
153 | ||
154 | static inline uint16_t vring_get_used_event(VirtQueue *vq) | |
155 | { | |
156 | return vring_avail_ring(vq, vq->vring.num); | |
157 | } | |
158 | ||
159 | static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem, | |
160 | int i) | |
161 | { | |
162 | hwaddr pa; | |
163 | virtio_tswap32s(vq->vdev, &uelem->id); | |
164 | virtio_tswap32s(vq->vdev, &uelem->len); | |
165 | pa = vq->vring.used + offsetof(VRingUsed, ring[i]); | |
166 | address_space_write(&address_space_memory, pa, MEMTXATTRS_UNSPECIFIED, | |
167 | (void *)uelem, sizeof(VRingUsedElem)); | |
168 | } | |
169 | ||
170 | static uint16_t vring_used_idx(VirtQueue *vq) | |
171 | { | |
172 | hwaddr pa; | |
173 | pa = vq->vring.used + offsetof(VRingUsed, idx); | |
174 | return virtio_lduw_phys(vq->vdev, pa); | |
175 | } | |
176 | ||
177 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) | |
178 | { | |
179 | hwaddr pa; | |
180 | pa = vq->vring.used + offsetof(VRingUsed, idx); | |
181 | virtio_stw_phys(vq->vdev, pa, val); | |
182 | vq->used_idx = val; | |
183 | } | |
184 | ||
185 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) | |
186 | { | |
187 | VirtIODevice *vdev = vq->vdev; | |
188 | hwaddr pa; | |
189 | pa = vq->vring.used + offsetof(VRingUsed, flags); | |
190 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) | mask); | |
191 | } | |
192 | ||
193 | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) | |
194 | { | |
195 | VirtIODevice *vdev = vq->vdev; | |
196 | hwaddr pa; | |
197 | pa = vq->vring.used + offsetof(VRingUsed, flags); | |
198 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) & ~mask); | |
199 | } | |
200 | ||
201 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) | |
202 | { | |
203 | hwaddr pa; | |
204 | if (!vq->notification) { | |
205 | return; | |
206 | } | |
207 | pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]); | |
208 | virtio_stw_phys(vq->vdev, pa, val); | |
209 | } | |
210 | ||
211 | void virtio_queue_set_notification(VirtQueue *vq, int enable) | |
212 | { | |
213 | vq->notification = enable; | |
214 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { | |
215 | vring_set_avail_event(vq, vring_avail_idx(vq)); | |
216 | } else if (enable) { | |
217 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); | |
218 | } else { | |
219 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); | |
220 | } | |
221 | if (enable) { | |
222 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
223 | smp_mb(); | |
224 | } | |
225 | } | |
226 | ||
227 | int virtio_queue_ready(VirtQueue *vq) | |
228 | { | |
229 | return vq->vring.avail != 0; | |
230 | } | |
231 | ||
232 | /* Fetch avail_idx from VQ memory only when we really need to know if | |
233 | * guest has added some buffers. */ | |
234 | int virtio_queue_empty(VirtQueue *vq) | |
235 | { | |
236 | if (vq->shadow_avail_idx != vq->last_avail_idx) { | |
237 | return 0; | |
238 | } | |
239 | ||
240 | return vring_avail_idx(vq) == vq->last_avail_idx; | |
241 | } | |
242 | ||
243 | static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, | |
244 | unsigned int len) | |
245 | { | |
246 | unsigned int offset; | |
247 | int i; | |
248 | ||
249 | offset = 0; | |
250 | for (i = 0; i < elem->in_num; i++) { | |
251 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); | |
252 | ||
253 | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, | |
254 | elem->in_sg[i].iov_len, | |
255 | 1, size); | |
256 | ||
257 | offset += size; | |
258 | } | |
259 | ||
260 | for (i = 0; i < elem->out_num; i++) | |
261 | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, | |
262 | elem->out_sg[i].iov_len, | |
263 | 0, elem->out_sg[i].iov_len); | |
264 | } | |
265 | ||
266 | void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem, | |
267 | unsigned int len) | |
268 | { | |
269 | vq->last_avail_idx--; | |
270 | virtqueue_unmap_sg(vq, elem, len); | |
271 | } | |
272 | ||
273 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, | |
274 | unsigned int len, unsigned int idx) | |
275 | { | |
276 | VRingUsedElem uelem; | |
277 | ||
278 | trace_virtqueue_fill(vq, elem, len, idx); | |
279 | ||
280 | virtqueue_unmap_sg(vq, elem, len); | |
281 | ||
282 | idx = (idx + vq->used_idx) % vq->vring.num; | |
283 | ||
284 | uelem.id = elem->index; | |
285 | uelem.len = len; | |
286 | vring_used_write(vq, &uelem, idx); | |
287 | } | |
288 | ||
289 | void virtqueue_flush(VirtQueue *vq, unsigned int count) | |
290 | { | |
291 | uint16_t old, new; | |
292 | /* Make sure buffer is written before we update index. */ | |
293 | smp_wmb(); | |
294 | trace_virtqueue_flush(vq, count); | |
295 | old = vq->used_idx; | |
296 | new = old + count; | |
297 | vring_used_idx_set(vq, new); | |
298 | vq->inuse -= count; | |
299 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) | |
300 | vq->signalled_used_valid = false; | |
301 | } | |
302 | ||
303 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, | |
304 | unsigned int len) | |
305 | { | |
306 | virtqueue_fill(vq, elem, len, 0); | |
307 | virtqueue_flush(vq, 1); | |
308 | } | |
309 | ||
310 | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) | |
311 | { | |
312 | uint16_t num_heads = vring_avail_idx(vq) - idx; | |
313 | ||
314 | /* Check it isn't doing very strange things with descriptor numbers. */ | |
315 | if (num_heads > vq->vring.num) { | |
316 | error_report("Guest moved used index from %u to %u", | |
317 | idx, vq->shadow_avail_idx); | |
318 | exit(1); | |
319 | } | |
320 | /* On success, callers read a descriptor at vq->last_avail_idx. | |
321 | * Make sure descriptor read does not bypass avail index read. */ | |
322 | if (num_heads) { | |
323 | smp_rmb(); | |
324 | } | |
325 | ||
326 | return num_heads; | |
327 | } | |
328 | ||
329 | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) | |
330 | { | |
331 | unsigned int head; | |
332 | ||
333 | /* Grab the next descriptor number they're advertising, and increment | |
334 | * the index we've seen. */ | |
335 | head = vring_avail_ring(vq, idx % vq->vring.num); | |
336 | ||
337 | /* If their number is silly, that's a fatal mistake. */ | |
338 | if (head >= vq->vring.num) { | |
339 | error_report("Guest says index %u is available", head); | |
340 | exit(1); | |
341 | } | |
342 | ||
343 | return head; | |
344 | } | |
345 | ||
346 | static unsigned virtqueue_read_next_desc(VirtIODevice *vdev, VRingDesc *desc, | |
347 | hwaddr desc_pa, unsigned int max) | |
348 | { | |
349 | unsigned int next; | |
350 | ||
351 | /* If this descriptor says it doesn't chain, we're done. */ | |
352 | if (!(desc->flags & VRING_DESC_F_NEXT)) { | |
353 | return max; | |
354 | } | |
355 | ||
356 | /* Check they're not leading us off end of descriptors. */ | |
357 | next = desc->next; | |
358 | /* Make sure compiler knows to grab that: we don't want it changing! */ | |
359 | smp_wmb(); | |
360 | ||
361 | if (next >= max) { | |
362 | error_report("Desc next is %u", next); | |
363 | exit(1); | |
364 | } | |
365 | ||
366 | vring_desc_read(vdev, desc, desc_pa, next); | |
367 | return next; | |
368 | } | |
369 | ||
370 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, | |
371 | unsigned int *out_bytes, | |
372 | unsigned max_in_bytes, unsigned max_out_bytes) | |
373 | { | |
374 | unsigned int idx; | |
375 | unsigned int total_bufs, in_total, out_total; | |
376 | ||
377 | idx = vq->last_avail_idx; | |
378 | ||
379 | total_bufs = in_total = out_total = 0; | |
380 | while (virtqueue_num_heads(vq, idx)) { | |
381 | VirtIODevice *vdev = vq->vdev; | |
382 | unsigned int max, num_bufs, indirect = 0; | |
383 | VRingDesc desc; | |
384 | hwaddr desc_pa; | |
385 | int i; | |
386 | ||
387 | max = vq->vring.num; | |
388 | num_bufs = total_bufs; | |
389 | i = virtqueue_get_head(vq, idx++); | |
390 | desc_pa = vq->vring.desc; | |
391 | vring_desc_read(vdev, &desc, desc_pa, i); | |
392 | ||
393 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
394 | if (desc.len % sizeof(VRingDesc)) { | |
395 | error_report("Invalid size for indirect buffer table"); | |
396 | exit(1); | |
397 | } | |
398 | ||
399 | /* If we've got too many, that implies a descriptor loop. */ | |
400 | if (num_bufs >= max) { | |
401 | error_report("Looped descriptor"); | |
402 | exit(1); | |
403 | } | |
404 | ||
405 | /* loop over the indirect descriptor table */ | |
406 | indirect = 1; | |
407 | max = desc.len / sizeof(VRingDesc); | |
408 | desc_pa = desc.addr; | |
409 | num_bufs = i = 0; | |
410 | vring_desc_read(vdev, &desc, desc_pa, i); | |
411 | } | |
412 | ||
413 | do { | |
414 | /* If we've got too many, that implies a descriptor loop. */ | |
415 | if (++num_bufs > max) { | |
416 | error_report("Looped descriptor"); | |
417 | exit(1); | |
418 | } | |
419 | ||
420 | if (desc.flags & VRING_DESC_F_WRITE) { | |
421 | in_total += desc.len; | |
422 | } else { | |
423 | out_total += desc.len; | |
424 | } | |
425 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { | |
426 | goto done; | |
427 | } | |
428 | } while ((i = virtqueue_read_next_desc(vdev, &desc, desc_pa, max)) != max); | |
429 | ||
430 | if (!indirect) | |
431 | total_bufs = num_bufs; | |
432 | else | |
433 | total_bufs++; | |
434 | } | |
435 | done: | |
436 | if (in_bytes) { | |
437 | *in_bytes = in_total; | |
438 | } | |
439 | if (out_bytes) { | |
440 | *out_bytes = out_total; | |
441 | } | |
442 | } | |
443 | ||
444 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, | |
445 | unsigned int out_bytes) | |
446 | { | |
447 | unsigned int in_total, out_total; | |
448 | ||
449 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); | |
450 | return in_bytes <= in_total && out_bytes <= out_total; | |
451 | } | |
452 | ||
453 | static void virtqueue_map_desc(unsigned int *p_num_sg, hwaddr *addr, struct iovec *iov, | |
454 | unsigned int max_num_sg, bool is_write, | |
455 | hwaddr pa, size_t sz) | |
456 | { | |
457 | unsigned num_sg = *p_num_sg; | |
458 | assert(num_sg <= max_num_sg); | |
459 | ||
460 | while (sz) { | |
461 | hwaddr len = sz; | |
462 | ||
463 | if (num_sg == max_num_sg) { | |
464 | error_report("virtio: too many write descriptors in indirect table"); | |
465 | exit(1); | |
466 | } | |
467 | ||
468 | iov[num_sg].iov_base = cpu_physical_memory_map(pa, &len, is_write); | |
469 | iov[num_sg].iov_len = len; | |
470 | addr[num_sg] = pa; | |
471 | ||
472 | sz -= len; | |
473 | pa += len; | |
474 | num_sg++; | |
475 | } | |
476 | *p_num_sg = num_sg; | |
477 | } | |
478 | ||
479 | static void virtqueue_map_iovec(struct iovec *sg, hwaddr *addr, | |
480 | unsigned int *num_sg, unsigned int max_size, | |
481 | int is_write) | |
482 | { | |
483 | unsigned int i; | |
484 | hwaddr len; | |
485 | ||
486 | /* Note: this function MUST validate input, some callers | |
487 | * are passing in num_sg values received over the network. | |
488 | */ | |
489 | /* TODO: teach all callers that this can fail, and return failure instead | |
490 | * of asserting here. | |
491 | * When we do, we might be able to re-enable NDEBUG below. | |
492 | */ | |
493 | #ifdef NDEBUG | |
494 | #error building with NDEBUG is not supported | |
495 | #endif | |
496 | assert(*num_sg <= max_size); | |
497 | ||
498 | for (i = 0; i < *num_sg; i++) { | |
499 | len = sg[i].iov_len; | |
500 | sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); | |
501 | if (!sg[i].iov_base) { | |
502 | error_report("virtio: error trying to map MMIO memory"); | |
503 | exit(1); | |
504 | } | |
505 | if (len != sg[i].iov_len) { | |
506 | error_report("virtio: unexpected memory split"); | |
507 | exit(1); | |
508 | } | |
509 | } | |
510 | } | |
511 | ||
512 | void virtqueue_map(VirtQueueElement *elem) | |
513 | { | |
514 | virtqueue_map_iovec(elem->in_sg, elem->in_addr, &elem->in_num, | |
515 | VIRTQUEUE_MAX_SIZE, 1); | |
516 | virtqueue_map_iovec(elem->out_sg, elem->out_addr, &elem->out_num, | |
517 | VIRTQUEUE_MAX_SIZE, 0); | |
518 | } | |
519 | ||
520 | void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num) | |
521 | { | |
522 | VirtQueueElement *elem; | |
523 | size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0])); | |
524 | size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]); | |
525 | size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]); | |
526 | size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0])); | |
527 | size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); | |
528 | size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); | |
529 | ||
530 | assert(sz >= sizeof(VirtQueueElement)); | |
531 | elem = g_malloc(out_sg_end); | |
532 | elem->out_num = out_num; | |
533 | elem->in_num = in_num; | |
534 | elem->in_addr = (void *)elem + in_addr_ofs; | |
535 | elem->out_addr = (void *)elem + out_addr_ofs; | |
536 | elem->in_sg = (void *)elem + in_sg_ofs; | |
537 | elem->out_sg = (void *)elem + out_sg_ofs; | |
538 | return elem; | |
539 | } | |
540 | ||
541 | void *virtqueue_pop(VirtQueue *vq, size_t sz) | |
542 | { | |
543 | unsigned int i, head, max; | |
544 | hwaddr desc_pa = vq->vring.desc; | |
545 | VirtIODevice *vdev = vq->vdev; | |
546 | VirtQueueElement *elem; | |
547 | unsigned out_num, in_num; | |
548 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; | |
549 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
550 | VRingDesc desc; | |
551 | ||
552 | if (virtio_queue_empty(vq)) { | |
553 | return NULL; | |
554 | } | |
555 | /* Needed after virtio_queue_empty(), see comment in | |
556 | * virtqueue_num_heads(). */ | |
557 | smp_rmb(); | |
558 | ||
559 | /* When we start there are none of either input nor output. */ | |
560 | out_num = in_num = 0; | |
561 | ||
562 | max = vq->vring.num; | |
563 | ||
564 | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); | |
565 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { | |
566 | vring_set_avail_event(vq, vq->last_avail_idx); | |
567 | } | |
568 | ||
569 | vring_desc_read(vdev, &desc, desc_pa, i); | |
570 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
571 | if (desc.len % sizeof(VRingDesc)) { | |
572 | error_report("Invalid size for indirect buffer table"); | |
573 | exit(1); | |
574 | } | |
575 | ||
576 | /* loop over the indirect descriptor table */ | |
577 | max = desc.len / sizeof(VRingDesc); | |
578 | desc_pa = desc.addr; | |
579 | i = 0; | |
580 | vring_desc_read(vdev, &desc, desc_pa, i); | |
581 | } | |
582 | ||
583 | /* Collect all the descriptors */ | |
584 | do { | |
585 | if (desc.flags & VRING_DESC_F_WRITE) { | |
586 | virtqueue_map_desc(&in_num, addr + out_num, iov + out_num, | |
587 | VIRTQUEUE_MAX_SIZE - out_num, true, desc.addr, desc.len); | |
588 | } else { | |
589 | if (in_num) { | |
590 | error_report("Incorrect order for descriptors"); | |
591 | exit(1); | |
592 | } | |
593 | virtqueue_map_desc(&out_num, addr, iov, | |
594 | VIRTQUEUE_MAX_SIZE, false, desc.addr, desc.len); | |
595 | } | |
596 | ||
597 | /* If we've got too many, that implies a descriptor loop. */ | |
598 | if ((in_num + out_num) > max) { | |
599 | error_report("Looped descriptor"); | |
600 | exit(1); | |
601 | } | |
602 | } while ((i = virtqueue_read_next_desc(vdev, &desc, desc_pa, max)) != max); | |
603 | ||
604 | /* Now copy what we have collected and mapped */ | |
605 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
606 | elem->index = head; | |
607 | for (i = 0; i < out_num; i++) { | |
608 | elem->out_addr[i] = addr[i]; | |
609 | elem->out_sg[i] = iov[i]; | |
610 | } | |
611 | for (i = 0; i < in_num; i++) { | |
612 | elem->in_addr[i] = addr[out_num + i]; | |
613 | elem->in_sg[i] = iov[out_num + i]; | |
614 | } | |
615 | ||
616 | vq->inuse++; | |
617 | ||
618 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); | |
619 | return elem; | |
620 | } | |
621 | ||
622 | /* Reading and writing a structure directly to QEMUFile is *awful*, but | |
623 | * it is what QEMU has always done by mistake. We can change it sooner | |
624 | * or later by bumping the version number of the affected vm states. | |
625 | * In the meanwhile, since the in-memory layout of VirtQueueElement | |
626 | * has changed, we need to marshal to and from the layout that was | |
627 | * used before the change. | |
628 | */ | |
629 | typedef struct VirtQueueElementOld { | |
630 | unsigned int index; | |
631 | unsigned int out_num; | |
632 | unsigned int in_num; | |
633 | hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; | |
634 | hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; | |
635 | struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; | |
636 | struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; | |
637 | } VirtQueueElementOld; | |
638 | ||
639 | void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz) | |
640 | { | |
641 | VirtQueueElement *elem; | |
642 | VirtQueueElementOld data; | |
643 | int i; | |
644 | ||
645 | qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
646 | ||
647 | elem = virtqueue_alloc_element(sz, data.out_num, data.in_num); | |
648 | elem->index = data.index; | |
649 | ||
650 | for (i = 0; i < elem->in_num; i++) { | |
651 | elem->in_addr[i] = data.in_addr[i]; | |
652 | } | |
653 | ||
654 | for (i = 0; i < elem->out_num; i++) { | |
655 | elem->out_addr[i] = data.out_addr[i]; | |
656 | } | |
657 | ||
658 | for (i = 0; i < elem->in_num; i++) { | |
659 | /* Base is overwritten by virtqueue_map. */ | |
660 | elem->in_sg[i].iov_base = 0; | |
661 | elem->in_sg[i].iov_len = data.in_sg[i].iov_len; | |
662 | } | |
663 | ||
664 | for (i = 0; i < elem->out_num; i++) { | |
665 | /* Base is overwritten by virtqueue_map. */ | |
666 | elem->out_sg[i].iov_base = 0; | |
667 | elem->out_sg[i].iov_len = data.out_sg[i].iov_len; | |
668 | } | |
669 | ||
670 | virtqueue_map(elem); | |
671 | return elem; | |
672 | } | |
673 | ||
674 | void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem) | |
675 | { | |
676 | VirtQueueElementOld data; | |
677 | int i; | |
678 | ||
679 | memset(&data, 0, sizeof(data)); | |
680 | data.index = elem->index; | |
681 | data.in_num = elem->in_num; | |
682 | data.out_num = elem->out_num; | |
683 | ||
684 | for (i = 0; i < elem->in_num; i++) { | |
685 | data.in_addr[i] = elem->in_addr[i]; | |
686 | } | |
687 | ||
688 | for (i = 0; i < elem->out_num; i++) { | |
689 | data.out_addr[i] = elem->out_addr[i]; | |
690 | } | |
691 | ||
692 | for (i = 0; i < elem->in_num; i++) { | |
693 | /* Base is overwritten by virtqueue_map when loading. Do not | |
694 | * save it, as it would leak the QEMU address space layout. */ | |
695 | data.in_sg[i].iov_len = elem->in_sg[i].iov_len; | |
696 | } | |
697 | ||
698 | for (i = 0; i < elem->out_num; i++) { | |
699 | /* Do not save iov_base as above. */ | |
700 | data.out_sg[i].iov_len = elem->out_sg[i].iov_len; | |
701 | } | |
702 | qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
703 | } | |
704 | ||
705 | /* virtio device */ | |
706 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) | |
707 | { | |
708 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
709 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
710 | ||
711 | if (k->notify) { | |
712 | k->notify(qbus->parent, vector); | |
713 | } | |
714 | } | |
715 | ||
716 | void virtio_update_irq(VirtIODevice *vdev) | |
717 | { | |
718 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); | |
719 | } | |
720 | ||
721 | static int virtio_validate_features(VirtIODevice *vdev) | |
722 | { | |
723 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
724 | ||
725 | if (k->validate_features) { | |
726 | return k->validate_features(vdev); | |
727 | } else { | |
728 | return 0; | |
729 | } | |
730 | } | |
731 | ||
732 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) | |
733 | { | |
734 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
735 | trace_virtio_set_status(vdev, val); | |
736 | ||
737 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
738 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && | |
739 | val & VIRTIO_CONFIG_S_FEATURES_OK) { | |
740 | int ret = virtio_validate_features(vdev); | |
741 | ||
742 | if (ret) { | |
743 | return ret; | |
744 | } | |
745 | } | |
746 | } | |
747 | if (k->set_status) { | |
748 | k->set_status(vdev, val); | |
749 | } | |
750 | vdev->status = val; | |
751 | return 0; | |
752 | } | |
753 | ||
754 | bool target_words_bigendian(void); | |
755 | static enum virtio_device_endian virtio_default_endian(void) | |
756 | { | |
757 | if (target_words_bigendian()) { | |
758 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
759 | } else { | |
760 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
761 | } | |
762 | } | |
763 | ||
764 | static enum virtio_device_endian virtio_current_cpu_endian(void) | |
765 | { | |
766 | CPUClass *cc = CPU_GET_CLASS(current_cpu); | |
767 | ||
768 | if (cc->virtio_is_big_endian(current_cpu)) { | |
769 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
770 | } else { | |
771 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
772 | } | |
773 | } | |
774 | ||
775 | void virtio_reset(void *opaque) | |
776 | { | |
777 | VirtIODevice *vdev = opaque; | |
778 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
779 | int i; | |
780 | ||
781 | virtio_set_status(vdev, 0); | |
782 | if (current_cpu) { | |
783 | /* Guest initiated reset */ | |
784 | vdev->device_endian = virtio_current_cpu_endian(); | |
785 | } else { | |
786 | /* System reset */ | |
787 | vdev->device_endian = virtio_default_endian(); | |
788 | } | |
789 | ||
790 | if (k->reset) { | |
791 | k->reset(vdev); | |
792 | } | |
793 | ||
794 | vdev->guest_features = 0; | |
795 | vdev->queue_sel = 0; | |
796 | vdev->status = 0; | |
797 | vdev->isr = 0; | |
798 | vdev->config_vector = VIRTIO_NO_VECTOR; | |
799 | virtio_notify_vector(vdev, vdev->config_vector); | |
800 | ||
801 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
802 | vdev->vq[i].vring.desc = 0; | |
803 | vdev->vq[i].vring.avail = 0; | |
804 | vdev->vq[i].vring.used = 0; | |
805 | vdev->vq[i].last_avail_idx = 0; | |
806 | vdev->vq[i].shadow_avail_idx = 0; | |
807 | vdev->vq[i].used_idx = 0; | |
808 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); | |
809 | vdev->vq[i].signalled_used = 0; | |
810 | vdev->vq[i].signalled_used_valid = false; | |
811 | vdev->vq[i].notification = true; | |
812 | vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; | |
813 | } | |
814 | } | |
815 | ||
816 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) | |
817 | { | |
818 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
819 | uint8_t val; | |
820 | ||
821 | if (addr + sizeof(val) > vdev->config_len) { | |
822 | return (uint32_t)-1; | |
823 | } | |
824 | ||
825 | k->get_config(vdev, vdev->config); | |
826 | ||
827 | val = ldub_p(vdev->config + addr); | |
828 | return val; | |
829 | } | |
830 | ||
831 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) | |
832 | { | |
833 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
834 | uint16_t val; | |
835 | ||
836 | if (addr + sizeof(val) > vdev->config_len) { | |
837 | return (uint32_t)-1; | |
838 | } | |
839 | ||
840 | k->get_config(vdev, vdev->config); | |
841 | ||
842 | val = lduw_p(vdev->config + addr); | |
843 | return val; | |
844 | } | |
845 | ||
846 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) | |
847 | { | |
848 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
849 | uint32_t val; | |
850 | ||
851 | if (addr + sizeof(val) > vdev->config_len) { | |
852 | return (uint32_t)-1; | |
853 | } | |
854 | ||
855 | k->get_config(vdev, vdev->config); | |
856 | ||
857 | val = ldl_p(vdev->config + addr); | |
858 | return val; | |
859 | } | |
860 | ||
861 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) | |
862 | { | |
863 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
864 | uint8_t val = data; | |
865 | ||
866 | if (addr + sizeof(val) > vdev->config_len) { | |
867 | return; | |
868 | } | |
869 | ||
870 | stb_p(vdev->config + addr, val); | |
871 | ||
872 | if (k->set_config) { | |
873 | k->set_config(vdev, vdev->config); | |
874 | } | |
875 | } | |
876 | ||
877 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) | |
878 | { | |
879 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
880 | uint16_t val = data; | |
881 | ||
882 | if (addr + sizeof(val) > vdev->config_len) { | |
883 | return; | |
884 | } | |
885 | ||
886 | stw_p(vdev->config + addr, val); | |
887 | ||
888 | if (k->set_config) { | |
889 | k->set_config(vdev, vdev->config); | |
890 | } | |
891 | } | |
892 | ||
893 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) | |
894 | { | |
895 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
896 | uint32_t val = data; | |
897 | ||
898 | if (addr + sizeof(val) > vdev->config_len) { | |
899 | return; | |
900 | } | |
901 | ||
902 | stl_p(vdev->config + addr, val); | |
903 | ||
904 | if (k->set_config) { | |
905 | k->set_config(vdev, vdev->config); | |
906 | } | |
907 | } | |
908 | ||
909 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr) | |
910 | { | |
911 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
912 | uint8_t val; | |
913 | ||
914 | if (addr + sizeof(val) > vdev->config_len) { | |
915 | return (uint32_t)-1; | |
916 | } | |
917 | ||
918 | k->get_config(vdev, vdev->config); | |
919 | ||
920 | val = ldub_p(vdev->config + addr); | |
921 | return val; | |
922 | } | |
923 | ||
924 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr) | |
925 | { | |
926 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
927 | uint16_t val; | |
928 | ||
929 | if (addr + sizeof(val) > vdev->config_len) { | |
930 | return (uint32_t)-1; | |
931 | } | |
932 | ||
933 | k->get_config(vdev, vdev->config); | |
934 | ||
935 | val = lduw_le_p(vdev->config + addr); | |
936 | return val; | |
937 | } | |
938 | ||
939 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr) | |
940 | { | |
941 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
942 | uint32_t val; | |
943 | ||
944 | if (addr + sizeof(val) > vdev->config_len) { | |
945 | return (uint32_t)-1; | |
946 | } | |
947 | ||
948 | k->get_config(vdev, vdev->config); | |
949 | ||
950 | val = ldl_le_p(vdev->config + addr); | |
951 | return val; | |
952 | } | |
953 | ||
954 | void virtio_config_modern_writeb(VirtIODevice *vdev, | |
955 | uint32_t addr, uint32_t data) | |
956 | { | |
957 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
958 | uint8_t val = data; | |
959 | ||
960 | if (addr + sizeof(val) > vdev->config_len) { | |
961 | return; | |
962 | } | |
963 | ||
964 | stb_p(vdev->config + addr, val); | |
965 | ||
966 | if (k->set_config) { | |
967 | k->set_config(vdev, vdev->config); | |
968 | } | |
969 | } | |
970 | ||
971 | void virtio_config_modern_writew(VirtIODevice *vdev, | |
972 | uint32_t addr, uint32_t data) | |
973 | { | |
974 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
975 | uint16_t val = data; | |
976 | ||
977 | if (addr + sizeof(val) > vdev->config_len) { | |
978 | return; | |
979 | } | |
980 | ||
981 | stw_le_p(vdev->config + addr, val); | |
982 | ||
983 | if (k->set_config) { | |
984 | k->set_config(vdev, vdev->config); | |
985 | } | |
986 | } | |
987 | ||
988 | void virtio_config_modern_writel(VirtIODevice *vdev, | |
989 | uint32_t addr, uint32_t data) | |
990 | { | |
991 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
992 | uint32_t val = data; | |
993 | ||
994 | if (addr + sizeof(val) > vdev->config_len) { | |
995 | return; | |
996 | } | |
997 | ||
998 | stl_le_p(vdev->config + addr, val); | |
999 | ||
1000 | if (k->set_config) { | |
1001 | k->set_config(vdev, vdev->config); | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) | |
1006 | { | |
1007 | vdev->vq[n].vring.desc = addr; | |
1008 | virtio_queue_update_rings(vdev, n); | |
1009 | } | |
1010 | ||
1011 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) | |
1012 | { | |
1013 | return vdev->vq[n].vring.desc; | |
1014 | } | |
1015 | ||
1016 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, | |
1017 | hwaddr avail, hwaddr used) | |
1018 | { | |
1019 | vdev->vq[n].vring.desc = desc; | |
1020 | vdev->vq[n].vring.avail = avail; | |
1021 | vdev->vq[n].vring.used = used; | |
1022 | } | |
1023 | ||
1024 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) | |
1025 | { | |
1026 | /* Don't allow guest to flip queue between existent and | |
1027 | * nonexistent states, or to set it to an invalid size. | |
1028 | */ | |
1029 | if (!!num != !!vdev->vq[n].vring.num || | |
1030 | num > VIRTQUEUE_MAX_SIZE || | |
1031 | num < 0) { | |
1032 | return; | |
1033 | } | |
1034 | vdev->vq[n].vring.num = num; | |
1035 | } | |
1036 | ||
1037 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) | |
1038 | { | |
1039 | return QLIST_FIRST(&vdev->vector_queues[vector]); | |
1040 | } | |
1041 | ||
1042 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) | |
1043 | { | |
1044 | return QLIST_NEXT(vq, node); | |
1045 | } | |
1046 | ||
1047 | int virtio_queue_get_num(VirtIODevice *vdev, int n) | |
1048 | { | |
1049 | return vdev->vq[n].vring.num; | |
1050 | } | |
1051 | ||
1052 | int virtio_get_num_queues(VirtIODevice *vdev) | |
1053 | { | |
1054 | int i; | |
1055 | ||
1056 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1057 | if (!virtio_queue_get_num(vdev, i)) { | |
1058 | break; | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | return i; | |
1063 | } | |
1064 | ||
1065 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) | |
1066 | { | |
1067 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1068 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1069 | ||
1070 | /* virtio-1 compliant devices cannot change the alignment */ | |
1071 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
1072 | error_report("tried to modify queue alignment for virtio-1 device"); | |
1073 | return; | |
1074 | } | |
1075 | /* Check that the transport told us it was going to do this | |
1076 | * (so a buggy transport will immediately assert rather than | |
1077 | * silently failing to migrate this state) | |
1078 | */ | |
1079 | assert(k->has_variable_vring_alignment); | |
1080 | ||
1081 | vdev->vq[n].vring.align = align; | |
1082 | virtio_queue_update_rings(vdev, n); | |
1083 | } | |
1084 | ||
1085 | static void virtio_queue_notify_aio_vq(VirtQueue *vq) | |
1086 | { | |
1087 | if (vq->vring.desc && vq->handle_aio_output) { | |
1088 | VirtIODevice *vdev = vq->vdev; | |
1089 | ||
1090 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
1091 | vq->handle_aio_output(vdev, vq); | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | static void virtio_queue_notify_vq(VirtQueue *vq) | |
1096 | { | |
1097 | if (vq->vring.desc && vq->handle_output) { | |
1098 | VirtIODevice *vdev = vq->vdev; | |
1099 | ||
1100 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
1101 | vq->handle_output(vdev, vq); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | void virtio_queue_notify(VirtIODevice *vdev, int n) | |
1106 | { | |
1107 | virtio_queue_notify_vq(&vdev->vq[n]); | |
1108 | } | |
1109 | ||
1110 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) | |
1111 | { | |
1112 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : | |
1113 | VIRTIO_NO_VECTOR; | |
1114 | } | |
1115 | ||
1116 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) | |
1117 | { | |
1118 | VirtQueue *vq = &vdev->vq[n]; | |
1119 | ||
1120 | if (n < VIRTIO_QUEUE_MAX) { | |
1121 | if (vdev->vector_queues && | |
1122 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { | |
1123 | QLIST_REMOVE(vq, node); | |
1124 | } | |
1125 | vdev->vq[n].vector = vector; | |
1126 | if (vdev->vector_queues && | |
1127 | vector != VIRTIO_NO_VECTOR) { | |
1128 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); | |
1129 | } | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, | |
1134 | void (*handle_output)(VirtIODevice *, VirtQueue *)) | |
1135 | { | |
1136 | int i; | |
1137 | ||
1138 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1139 | if (vdev->vq[i].vring.num == 0) | |
1140 | break; | |
1141 | } | |
1142 | ||
1143 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) | |
1144 | abort(); | |
1145 | ||
1146 | vdev->vq[i].vring.num = queue_size; | |
1147 | vdev->vq[i].vring.num_default = queue_size; | |
1148 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; | |
1149 | vdev->vq[i].handle_output = handle_output; | |
1150 | vdev->vq[i].handle_aio_output = NULL; | |
1151 | ||
1152 | return &vdev->vq[i]; | |
1153 | } | |
1154 | ||
1155 | void virtio_del_queue(VirtIODevice *vdev, int n) | |
1156 | { | |
1157 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { | |
1158 | abort(); | |
1159 | } | |
1160 | ||
1161 | vdev->vq[n].vring.num = 0; | |
1162 | vdev->vq[n].vring.num_default = 0; | |
1163 | } | |
1164 | ||
1165 | void virtio_irq(VirtQueue *vq) | |
1166 | { | |
1167 | trace_virtio_irq(vq); | |
1168 | vq->vdev->isr |= 0x01; | |
1169 | virtio_notify_vector(vq->vdev, vq->vector); | |
1170 | } | |
1171 | ||
1172 | bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq) | |
1173 | { | |
1174 | uint16_t old, new; | |
1175 | bool v; | |
1176 | /* We need to expose used array entries before checking used event. */ | |
1177 | smp_mb(); | |
1178 | /* Always notify when queue is empty (when feature acknowledge) */ | |
1179 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && | |
1180 | !vq->inuse && virtio_queue_empty(vq)) { | |
1181 | return true; | |
1182 | } | |
1183 | ||
1184 | if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { | |
1185 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); | |
1186 | } | |
1187 | ||
1188 | v = vq->signalled_used_valid; | |
1189 | vq->signalled_used_valid = true; | |
1190 | old = vq->signalled_used; | |
1191 | new = vq->signalled_used = vq->used_idx; | |
1192 | return !v || vring_need_event(vring_get_used_event(vq), new, old); | |
1193 | } | |
1194 | ||
1195 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) | |
1196 | { | |
1197 | if (!virtio_should_notify(vdev, vq)) { | |
1198 | return; | |
1199 | } | |
1200 | ||
1201 | trace_virtio_notify(vdev, vq); | |
1202 | vdev->isr |= 0x01; | |
1203 | virtio_notify_vector(vdev, vq->vector); | |
1204 | } | |
1205 | ||
1206 | void virtio_notify_config(VirtIODevice *vdev) | |
1207 | { | |
1208 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) | |
1209 | return; | |
1210 | ||
1211 | vdev->isr |= 0x03; | |
1212 | vdev->generation++; | |
1213 | virtio_notify_vector(vdev, vdev->config_vector); | |
1214 | } | |
1215 | ||
1216 | static bool virtio_device_endian_needed(void *opaque) | |
1217 | { | |
1218 | VirtIODevice *vdev = opaque; | |
1219 | ||
1220 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); | |
1221 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
1222 | return vdev->device_endian != virtio_default_endian(); | |
1223 | } | |
1224 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
1225 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; | |
1226 | } | |
1227 | ||
1228 | static bool virtio_64bit_features_needed(void *opaque) | |
1229 | { | |
1230 | VirtIODevice *vdev = opaque; | |
1231 | ||
1232 | return (vdev->host_features >> 32) != 0; | |
1233 | } | |
1234 | ||
1235 | static bool virtio_virtqueue_needed(void *opaque) | |
1236 | { | |
1237 | VirtIODevice *vdev = opaque; | |
1238 | ||
1239 | return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1); | |
1240 | } | |
1241 | ||
1242 | static bool virtio_ringsize_needed(void *opaque) | |
1243 | { | |
1244 | VirtIODevice *vdev = opaque; | |
1245 | int i; | |
1246 | ||
1247 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1248 | if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) { | |
1249 | return true; | |
1250 | } | |
1251 | } | |
1252 | return false; | |
1253 | } | |
1254 | ||
1255 | static bool virtio_extra_state_needed(void *opaque) | |
1256 | { | |
1257 | VirtIODevice *vdev = opaque; | |
1258 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1259 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1260 | ||
1261 | return k->has_extra_state && | |
1262 | k->has_extra_state(qbus->parent); | |
1263 | } | |
1264 | ||
1265 | static const VMStateDescription vmstate_virtqueue = { | |
1266 | .name = "virtqueue_state", | |
1267 | .version_id = 1, | |
1268 | .minimum_version_id = 1, | |
1269 | .fields = (VMStateField[]) { | |
1270 | VMSTATE_UINT64(vring.avail, struct VirtQueue), | |
1271 | VMSTATE_UINT64(vring.used, struct VirtQueue), | |
1272 | VMSTATE_END_OF_LIST() | |
1273 | } | |
1274 | }; | |
1275 | ||
1276 | static const VMStateDescription vmstate_virtio_virtqueues = { | |
1277 | .name = "virtio/virtqueues", | |
1278 | .version_id = 1, | |
1279 | .minimum_version_id = 1, | |
1280 | .needed = &virtio_virtqueue_needed, | |
1281 | .fields = (VMStateField[]) { | |
1282 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, | |
1283 | VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue), | |
1284 | VMSTATE_END_OF_LIST() | |
1285 | } | |
1286 | }; | |
1287 | ||
1288 | static const VMStateDescription vmstate_ringsize = { | |
1289 | .name = "ringsize_state", | |
1290 | .version_id = 1, | |
1291 | .minimum_version_id = 1, | |
1292 | .fields = (VMStateField[]) { | |
1293 | VMSTATE_UINT32(vring.num_default, struct VirtQueue), | |
1294 | VMSTATE_END_OF_LIST() | |
1295 | } | |
1296 | }; | |
1297 | ||
1298 | static const VMStateDescription vmstate_virtio_ringsize = { | |
1299 | .name = "virtio/ringsize", | |
1300 | .version_id = 1, | |
1301 | .minimum_version_id = 1, | |
1302 | .needed = &virtio_ringsize_needed, | |
1303 | .fields = (VMStateField[]) { | |
1304 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, | |
1305 | VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue), | |
1306 | VMSTATE_END_OF_LIST() | |
1307 | } | |
1308 | }; | |
1309 | ||
1310 | static int get_extra_state(QEMUFile *f, void *pv, size_t size) | |
1311 | { | |
1312 | VirtIODevice *vdev = pv; | |
1313 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1314 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1315 | ||
1316 | if (!k->load_extra_state) { | |
1317 | return -1; | |
1318 | } else { | |
1319 | return k->load_extra_state(qbus->parent, f); | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | static void put_extra_state(QEMUFile *f, void *pv, size_t size) | |
1324 | { | |
1325 | VirtIODevice *vdev = pv; | |
1326 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1327 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1328 | ||
1329 | k->save_extra_state(qbus->parent, f); | |
1330 | } | |
1331 | ||
1332 | static const VMStateInfo vmstate_info_extra_state = { | |
1333 | .name = "virtqueue_extra_state", | |
1334 | .get = get_extra_state, | |
1335 | .put = put_extra_state, | |
1336 | }; | |
1337 | ||
1338 | static const VMStateDescription vmstate_virtio_extra_state = { | |
1339 | .name = "virtio/extra_state", | |
1340 | .version_id = 1, | |
1341 | .minimum_version_id = 1, | |
1342 | .needed = &virtio_extra_state_needed, | |
1343 | .fields = (VMStateField[]) { | |
1344 | { | |
1345 | .name = "extra_state", | |
1346 | .version_id = 0, | |
1347 | .field_exists = NULL, | |
1348 | .size = 0, | |
1349 | .info = &vmstate_info_extra_state, | |
1350 | .flags = VMS_SINGLE, | |
1351 | .offset = 0, | |
1352 | }, | |
1353 | VMSTATE_END_OF_LIST() | |
1354 | } | |
1355 | }; | |
1356 | ||
1357 | static const VMStateDescription vmstate_virtio_device_endian = { | |
1358 | .name = "virtio/device_endian", | |
1359 | .version_id = 1, | |
1360 | .minimum_version_id = 1, | |
1361 | .needed = &virtio_device_endian_needed, | |
1362 | .fields = (VMStateField[]) { | |
1363 | VMSTATE_UINT8(device_endian, VirtIODevice), | |
1364 | VMSTATE_END_OF_LIST() | |
1365 | } | |
1366 | }; | |
1367 | ||
1368 | static const VMStateDescription vmstate_virtio_64bit_features = { | |
1369 | .name = "virtio/64bit_features", | |
1370 | .version_id = 1, | |
1371 | .minimum_version_id = 1, | |
1372 | .needed = &virtio_64bit_features_needed, | |
1373 | .fields = (VMStateField[]) { | |
1374 | VMSTATE_UINT64(guest_features, VirtIODevice), | |
1375 | VMSTATE_END_OF_LIST() | |
1376 | } | |
1377 | }; | |
1378 | ||
1379 | static const VMStateDescription vmstate_virtio = { | |
1380 | .name = "virtio", | |
1381 | .version_id = 1, | |
1382 | .minimum_version_id = 1, | |
1383 | .minimum_version_id_old = 1, | |
1384 | .fields = (VMStateField[]) { | |
1385 | VMSTATE_END_OF_LIST() | |
1386 | }, | |
1387 | .subsections = (const VMStateDescription*[]) { | |
1388 | &vmstate_virtio_device_endian, | |
1389 | &vmstate_virtio_64bit_features, | |
1390 | &vmstate_virtio_virtqueues, | |
1391 | &vmstate_virtio_ringsize, | |
1392 | &vmstate_virtio_extra_state, | |
1393 | NULL | |
1394 | } | |
1395 | }; | |
1396 | ||
1397 | void virtio_save(VirtIODevice *vdev, QEMUFile *f) | |
1398 | { | |
1399 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1400 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1401 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); | |
1402 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); | |
1403 | int i; | |
1404 | ||
1405 | if (k->save_config) { | |
1406 | k->save_config(qbus->parent, f); | |
1407 | } | |
1408 | ||
1409 | qemu_put_8s(f, &vdev->status); | |
1410 | qemu_put_8s(f, &vdev->isr); | |
1411 | qemu_put_be16s(f, &vdev->queue_sel); | |
1412 | qemu_put_be32s(f, &guest_features_lo); | |
1413 | qemu_put_be32(f, vdev->config_len); | |
1414 | qemu_put_buffer(f, vdev->config, vdev->config_len); | |
1415 | ||
1416 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1417 | if (vdev->vq[i].vring.num == 0) | |
1418 | break; | |
1419 | } | |
1420 | ||
1421 | qemu_put_be32(f, i); | |
1422 | ||
1423 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1424 | if (vdev->vq[i].vring.num == 0) | |
1425 | break; | |
1426 | ||
1427 | qemu_put_be32(f, vdev->vq[i].vring.num); | |
1428 | if (k->has_variable_vring_alignment) { | |
1429 | qemu_put_be32(f, vdev->vq[i].vring.align); | |
1430 | } | |
1431 | /* XXX virtio-1 devices */ | |
1432 | qemu_put_be64(f, vdev->vq[i].vring.desc); | |
1433 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); | |
1434 | if (k->save_queue) { | |
1435 | k->save_queue(qbus->parent, i, f); | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | if (vdc->save != NULL) { | |
1440 | vdc->save(vdev, f); | |
1441 | } | |
1442 | ||
1443 | /* Subsections */ | |
1444 | vmstate_save_state(f, &vmstate_virtio, vdev, NULL); | |
1445 | } | |
1446 | ||
1447 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) | |
1448 | { | |
1449 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
1450 | bool bad = (val & ~(vdev->host_features)) != 0; | |
1451 | ||
1452 | val &= vdev->host_features; | |
1453 | if (k->set_features) { | |
1454 | k->set_features(vdev, val); | |
1455 | } | |
1456 | vdev->guest_features = val; | |
1457 | return bad ? -1 : 0; | |
1458 | } | |
1459 | ||
1460 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) | |
1461 | { | |
1462 | /* | |
1463 | * The driver must not attempt to set features after feature negotiation | |
1464 | * has finished. | |
1465 | */ | |
1466 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { | |
1467 | return -EINVAL; | |
1468 | } | |
1469 | return virtio_set_features_nocheck(vdev, val); | |
1470 | } | |
1471 | ||
1472 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) | |
1473 | { | |
1474 | int i, ret; | |
1475 | int32_t config_len; | |
1476 | uint32_t num; | |
1477 | uint32_t features; | |
1478 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1479 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1480 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); | |
1481 | ||
1482 | /* | |
1483 | * We poison the endianness to ensure it does not get used before | |
1484 | * subsections have been loaded. | |
1485 | */ | |
1486 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; | |
1487 | ||
1488 | if (k->load_config) { | |
1489 | ret = k->load_config(qbus->parent, f); | |
1490 | if (ret) | |
1491 | return ret; | |
1492 | } | |
1493 | ||
1494 | qemu_get_8s(f, &vdev->status); | |
1495 | qemu_get_8s(f, &vdev->isr); | |
1496 | qemu_get_be16s(f, &vdev->queue_sel); | |
1497 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { | |
1498 | return -1; | |
1499 | } | |
1500 | qemu_get_be32s(f, &features); | |
1501 | ||
1502 | /* | |
1503 | * Temporarily set guest_features low bits - needed by | |
1504 | * virtio net load code testing for VIRTIO_NET_F_CTRL_GUEST_OFFLOADS | |
1505 | * VIRTIO_NET_F_GUEST_ANNOUNCE and VIRTIO_NET_F_CTRL_VQ. | |
1506 | * | |
1507 | * Note: devices should always test host features in future - don't create | |
1508 | * new dependencies like this. | |
1509 | */ | |
1510 | vdev->guest_features = features; | |
1511 | ||
1512 | config_len = qemu_get_be32(f); | |
1513 | ||
1514 | /* | |
1515 | * There are cases where the incoming config can be bigger or smaller | |
1516 | * than what we have; so load what we have space for, and skip | |
1517 | * any excess that's in the stream. | |
1518 | */ | |
1519 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); | |
1520 | ||
1521 | while (config_len > vdev->config_len) { | |
1522 | qemu_get_byte(f); | |
1523 | config_len--; | |
1524 | } | |
1525 | ||
1526 | num = qemu_get_be32(f); | |
1527 | ||
1528 | if (num > VIRTIO_QUEUE_MAX) { | |
1529 | error_report("Invalid number of virtqueues: 0x%x", num); | |
1530 | return -1; | |
1531 | } | |
1532 | ||
1533 | for (i = 0; i < num; i++) { | |
1534 | vdev->vq[i].vring.num = qemu_get_be32(f); | |
1535 | if (k->has_variable_vring_alignment) { | |
1536 | vdev->vq[i].vring.align = qemu_get_be32(f); | |
1537 | } | |
1538 | vdev->vq[i].vring.desc = qemu_get_be64(f); | |
1539 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); | |
1540 | vdev->vq[i].signalled_used_valid = false; | |
1541 | vdev->vq[i].notification = true; | |
1542 | ||
1543 | if (vdev->vq[i].vring.desc) { | |
1544 | /* XXX virtio-1 devices */ | |
1545 | virtio_queue_update_rings(vdev, i); | |
1546 | } else if (vdev->vq[i].last_avail_idx) { | |
1547 | error_report("VQ %d address 0x0 " | |
1548 | "inconsistent with Host index 0x%x", | |
1549 | i, vdev->vq[i].last_avail_idx); | |
1550 | return -1; | |
1551 | } | |
1552 | if (k->load_queue) { | |
1553 | ret = k->load_queue(qbus->parent, i, f); | |
1554 | if (ret) | |
1555 | return ret; | |
1556 | } | |
1557 | } | |
1558 | ||
1559 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); | |
1560 | ||
1561 | if (vdc->load != NULL) { | |
1562 | ret = vdc->load(vdev, f, version_id); | |
1563 | if (ret) { | |
1564 | return ret; | |
1565 | } | |
1566 | } | |
1567 | ||
1568 | /* Subsections */ | |
1569 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); | |
1570 | if (ret) { | |
1571 | return ret; | |
1572 | } | |
1573 | ||
1574 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { | |
1575 | vdev->device_endian = virtio_default_endian(); | |
1576 | } | |
1577 | ||
1578 | if (virtio_64bit_features_needed(vdev)) { | |
1579 | /* | |
1580 | * Subsection load filled vdev->guest_features. Run them | |
1581 | * through virtio_set_features to sanity-check them against | |
1582 | * host_features. | |
1583 | */ | |
1584 | uint64_t features64 = vdev->guest_features; | |
1585 | if (virtio_set_features_nocheck(vdev, features64) < 0) { | |
1586 | error_report("Features 0x%" PRIx64 " unsupported. " | |
1587 | "Allowed features: 0x%" PRIx64, | |
1588 | features64, vdev->host_features); | |
1589 | return -1; | |
1590 | } | |
1591 | } else { | |
1592 | if (virtio_set_features_nocheck(vdev, features) < 0) { | |
1593 | error_report("Features 0x%x unsupported. " | |
1594 | "Allowed features: 0x%" PRIx64, | |
1595 | features, vdev->host_features); | |
1596 | return -1; | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | for (i = 0; i < num; i++) { | |
1601 | if (vdev->vq[i].vring.desc) { | |
1602 | uint16_t nheads; | |
1603 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; | |
1604 | /* Check it isn't doing strange things with descriptor numbers. */ | |
1605 | if (nheads > vdev->vq[i].vring.num) { | |
1606 | error_report("VQ %d size 0x%x Guest index 0x%x " | |
1607 | "inconsistent with Host index 0x%x: delta 0x%x", | |
1608 | i, vdev->vq[i].vring.num, | |
1609 | vring_avail_idx(&vdev->vq[i]), | |
1610 | vdev->vq[i].last_avail_idx, nheads); | |
1611 | return -1; | |
1612 | } | |
1613 | vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]); | |
1614 | vdev->vq[i].shadow_avail_idx = vring_avail_idx(&vdev->vq[i]); | |
1615 | } | |
1616 | } | |
1617 | ||
1618 | return 0; | |
1619 | } | |
1620 | ||
1621 | void virtio_cleanup(VirtIODevice *vdev) | |
1622 | { | |
1623 | qemu_del_vm_change_state_handler(vdev->vmstate); | |
1624 | g_free(vdev->config); | |
1625 | g_free(vdev->vq); | |
1626 | g_free(vdev->vector_queues); | |
1627 | } | |
1628 | ||
1629 | static void virtio_vmstate_change(void *opaque, int running, RunState state) | |
1630 | { | |
1631 | VirtIODevice *vdev = opaque; | |
1632 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1633 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1634 | bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK); | |
1635 | vdev->vm_running = running; | |
1636 | ||
1637 | if (backend_run) { | |
1638 | virtio_set_status(vdev, vdev->status); | |
1639 | } | |
1640 | ||
1641 | if (k->vmstate_change) { | |
1642 | k->vmstate_change(qbus->parent, backend_run); | |
1643 | } | |
1644 | ||
1645 | if (!backend_run) { | |
1646 | virtio_set_status(vdev, vdev->status); | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | void virtio_instance_init_common(Object *proxy_obj, void *data, | |
1651 | size_t vdev_size, const char *vdev_name) | |
1652 | { | |
1653 | DeviceState *vdev = data; | |
1654 | ||
1655 | object_initialize(vdev, vdev_size, vdev_name); | |
1656 | object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL); | |
1657 | object_unref(OBJECT(vdev)); | |
1658 | qdev_alias_all_properties(vdev, proxy_obj); | |
1659 | } | |
1660 | ||
1661 | void virtio_init(VirtIODevice *vdev, const char *name, | |
1662 | uint16_t device_id, size_t config_size) | |
1663 | { | |
1664 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1665 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1666 | int i; | |
1667 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; | |
1668 | ||
1669 | if (nvectors) { | |
1670 | vdev->vector_queues = | |
1671 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); | |
1672 | } | |
1673 | ||
1674 | vdev->device_id = device_id; | |
1675 | vdev->status = 0; | |
1676 | vdev->isr = 0; | |
1677 | vdev->queue_sel = 0; | |
1678 | vdev->config_vector = VIRTIO_NO_VECTOR; | |
1679 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); | |
1680 | vdev->vm_running = runstate_is_running(); | |
1681 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1682 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; | |
1683 | vdev->vq[i].vdev = vdev; | |
1684 | vdev->vq[i].queue_index = i; | |
1685 | } | |
1686 | ||
1687 | vdev->name = name; | |
1688 | vdev->config_len = config_size; | |
1689 | if (vdev->config_len) { | |
1690 | vdev->config = g_malloc0(config_size); | |
1691 | } else { | |
1692 | vdev->config = NULL; | |
1693 | } | |
1694 | vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, | |
1695 | vdev); | |
1696 | vdev->device_endian = virtio_default_endian(); | |
1697 | vdev->use_guest_notifier_mask = true; | |
1698 | } | |
1699 | ||
1700 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) | |
1701 | { | |
1702 | return vdev->vq[n].vring.desc; | |
1703 | } | |
1704 | ||
1705 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) | |
1706 | { | |
1707 | return vdev->vq[n].vring.avail; | |
1708 | } | |
1709 | ||
1710 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) | |
1711 | { | |
1712 | return vdev->vq[n].vring.used; | |
1713 | } | |
1714 | ||
1715 | hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n) | |
1716 | { | |
1717 | return vdev->vq[n].vring.desc; | |
1718 | } | |
1719 | ||
1720 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) | |
1721 | { | |
1722 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; | |
1723 | } | |
1724 | ||
1725 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) | |
1726 | { | |
1727 | return offsetof(VRingAvail, ring) + | |
1728 | sizeof(uint16_t) * vdev->vq[n].vring.num; | |
1729 | } | |
1730 | ||
1731 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) | |
1732 | { | |
1733 | return offsetof(VRingUsed, ring) + | |
1734 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num; | |
1735 | } | |
1736 | ||
1737 | hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n) | |
1738 | { | |
1739 | return vdev->vq[n].vring.used - vdev->vq[n].vring.desc + | |
1740 | virtio_queue_get_used_size(vdev, n); | |
1741 | } | |
1742 | ||
1743 | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) | |
1744 | { | |
1745 | return vdev->vq[n].last_avail_idx; | |
1746 | } | |
1747 | ||
1748 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) | |
1749 | { | |
1750 | vdev->vq[n].last_avail_idx = idx; | |
1751 | vdev->vq[n].shadow_avail_idx = idx; | |
1752 | } | |
1753 | ||
1754 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) | |
1755 | { | |
1756 | vdev->vq[n].signalled_used_valid = false; | |
1757 | } | |
1758 | ||
1759 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) | |
1760 | { | |
1761 | return vdev->vq + n; | |
1762 | } | |
1763 | ||
1764 | uint16_t virtio_get_queue_index(VirtQueue *vq) | |
1765 | { | |
1766 | return vq->queue_index; | |
1767 | } | |
1768 | ||
1769 | static void virtio_queue_guest_notifier_read(EventNotifier *n) | |
1770 | { | |
1771 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); | |
1772 | if (event_notifier_test_and_clear(n)) { | |
1773 | virtio_irq(vq); | |
1774 | } | |
1775 | } | |
1776 | ||
1777 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, | |
1778 | bool with_irqfd) | |
1779 | { | |
1780 | if (assign && !with_irqfd) { | |
1781 | event_notifier_set_handler(&vq->guest_notifier, false, | |
1782 | virtio_queue_guest_notifier_read); | |
1783 | } else { | |
1784 | event_notifier_set_handler(&vq->guest_notifier, false, NULL); | |
1785 | } | |
1786 | if (!assign) { | |
1787 | /* Test and clear notifier before closing it, | |
1788 | * in case poll callback didn't have time to run. */ | |
1789 | virtio_queue_guest_notifier_read(&vq->guest_notifier); | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) | |
1794 | { | |
1795 | return &vq->guest_notifier; | |
1796 | } | |
1797 | ||
1798 | static void virtio_queue_host_notifier_aio_read(EventNotifier *n) | |
1799 | { | |
1800 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
1801 | if (event_notifier_test_and_clear(n)) { | |
1802 | virtio_queue_notify_aio_vq(vq); | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, | |
1807 | void (*handle_output)(VirtIODevice *, | |
1808 | VirtQueue *)) | |
1809 | { | |
1810 | if (handle_output) { | |
1811 | vq->handle_aio_output = handle_output; | |
1812 | aio_set_event_notifier(ctx, &vq->host_notifier, true, | |
1813 | virtio_queue_host_notifier_aio_read); | |
1814 | } else { | |
1815 | aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL); | |
1816 | /* Test and clear notifier before after disabling event, | |
1817 | * in case poll callback didn't have time to run. */ | |
1818 | virtio_queue_host_notifier_aio_read(&vq->host_notifier); | |
1819 | vq->handle_aio_output = NULL; | |
1820 | } | |
1821 | } | |
1822 | ||
1823 | static void virtio_queue_host_notifier_read(EventNotifier *n) | |
1824 | { | |
1825 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
1826 | if (event_notifier_test_and_clear(n)) { | |
1827 | virtio_queue_notify_vq(vq); | |
1828 | } | |
1829 | } | |
1830 | ||
1831 | void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, | |
1832 | bool set_handler) | |
1833 | { | |
1834 | if (assign && set_handler) { | |
1835 | event_notifier_set_handler(&vq->host_notifier, true, | |
1836 | virtio_queue_host_notifier_read); | |
1837 | } else { | |
1838 | event_notifier_set_handler(&vq->host_notifier, true, NULL); | |
1839 | } | |
1840 | if (!assign) { | |
1841 | /* Test and clear notifier before after disabling event, | |
1842 | * in case poll callback didn't have time to run. */ | |
1843 | virtio_queue_host_notifier_read(&vq->host_notifier); | |
1844 | } | |
1845 | } | |
1846 | ||
1847 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) | |
1848 | { | |
1849 | return &vq->host_notifier; | |
1850 | } | |
1851 | ||
1852 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) | |
1853 | { | |
1854 | g_free(vdev->bus_name); | |
1855 | vdev->bus_name = g_strdup(bus_name); | |
1856 | } | |
1857 | ||
1858 | static void virtio_device_realize(DeviceState *dev, Error **errp) | |
1859 | { | |
1860 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
1861 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
1862 | Error *err = NULL; | |
1863 | ||
1864 | if (vdc->realize != NULL) { | |
1865 | vdc->realize(dev, &err); | |
1866 | if (err != NULL) { | |
1867 | error_propagate(errp, err); | |
1868 | return; | |
1869 | } | |
1870 | } | |
1871 | ||
1872 | virtio_bus_device_plugged(vdev, &err); | |
1873 | if (err != NULL) { | |
1874 | error_propagate(errp, err); | |
1875 | return; | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | static void virtio_device_unrealize(DeviceState *dev, Error **errp) | |
1880 | { | |
1881 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
1882 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
1883 | Error *err = NULL; | |
1884 | ||
1885 | virtio_bus_device_unplugged(vdev); | |
1886 | ||
1887 | if (vdc->unrealize != NULL) { | |
1888 | vdc->unrealize(dev, &err); | |
1889 | if (err != NULL) { | |
1890 | error_propagate(errp, err); | |
1891 | return; | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | g_free(vdev->bus_name); | |
1896 | vdev->bus_name = NULL; | |
1897 | } | |
1898 | ||
1899 | static Property virtio_properties[] = { | |
1900 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), | |
1901 | DEFINE_PROP_END_OF_LIST(), | |
1902 | }; | |
1903 | ||
1904 | static void virtio_device_class_init(ObjectClass *klass, void *data) | |
1905 | { | |
1906 | /* Set the default value here. */ | |
1907 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1908 | ||
1909 | dc->realize = virtio_device_realize; | |
1910 | dc->unrealize = virtio_device_unrealize; | |
1911 | dc->bus_type = TYPE_VIRTIO_BUS; | |
1912 | dc->props = virtio_properties; | |
1913 | } | |
1914 | ||
1915 | static const TypeInfo virtio_device_info = { | |
1916 | .name = TYPE_VIRTIO_DEVICE, | |
1917 | .parent = TYPE_DEVICE, | |
1918 | .instance_size = sizeof(VirtIODevice), | |
1919 | .class_init = virtio_device_class_init, | |
1920 | .abstract = true, | |
1921 | .class_size = sizeof(VirtioDeviceClass), | |
1922 | }; | |
1923 | ||
1924 | static void virtio_register_types(void) | |
1925 | { | |
1926 | type_register_static(&virtio_device_info); | |
1927 | } | |
1928 | ||
1929 | type_init(virtio_register_types) |