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Commit | Line | Data |
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967f97fa AL |
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 <inttypes.h> | |
967f97fa | 15 | |
64979a4d | 16 | #include "trace.h" |
fdfba1a2 | 17 | #include "exec/address-spaces.h" |
1de7afc9 | 18 | #include "qemu/error-report.h" |
0d09e41a | 19 | #include "hw/virtio/virtio.h" |
1de7afc9 | 20 | #include "qemu/atomic.h" |
0d09e41a | 21 | #include "hw/virtio/virtio-bus.h" |
6b321a3d | 22 | #include "migration/migration.h" |
cee3ca00 | 23 | #include "hw/virtio/virtio-access.h" |
967f97fa | 24 | |
6ce69d1c PM |
25 | /* |
26 | * The alignment to use between consumer and producer parts of vring. | |
27 | * x86 pagesize again. This is the default, used by transports like PCI | |
28 | * which don't provide a means for the guest to tell the host the alignment. | |
29 | */ | |
f46f15bc AL |
30 | #define VIRTIO_PCI_VRING_ALIGN 4096 |
31 | ||
967f97fa AL |
32 | typedef struct VRingDesc |
33 | { | |
34 | uint64_t addr; | |
35 | uint32_t len; | |
36 | uint16_t flags; | |
37 | uint16_t next; | |
38 | } VRingDesc; | |
39 | ||
40 | typedef struct VRingAvail | |
41 | { | |
42 | uint16_t flags; | |
43 | uint16_t idx; | |
44 | uint16_t ring[0]; | |
45 | } VRingAvail; | |
46 | ||
47 | typedef struct VRingUsedElem | |
48 | { | |
49 | uint32_t id; | |
50 | uint32_t len; | |
51 | } VRingUsedElem; | |
52 | ||
53 | typedef struct VRingUsed | |
54 | { | |
55 | uint16_t flags; | |
56 | uint16_t idx; | |
57 | VRingUsedElem ring[0]; | |
58 | } VRingUsed; | |
59 | ||
60 | typedef struct VRing | |
61 | { | |
62 | unsigned int num; | |
46c5d082 | 63 | unsigned int num_default; |
6ce69d1c | 64 | unsigned int align; |
a8170e5e AK |
65 | hwaddr desc; |
66 | hwaddr avail; | |
67 | hwaddr used; | |
967f97fa AL |
68 | } VRing; |
69 | ||
70 | struct VirtQueue | |
71 | { | |
72 | VRing vring; | |
967f97fa | 73 | uint16_t last_avail_idx; |
bcbabae8 MT |
74 | /* Last used index value we have signalled on */ |
75 | uint16_t signalled_used; | |
76 | ||
77 | /* Last used index value we have signalled on */ | |
78 | bool signalled_used_valid; | |
79 | ||
80 | /* Notification enabled? */ | |
81 | bool notification; | |
82 | ||
e78a2b42 JW |
83 | uint16_t queue_index; |
84 | ||
967f97fa | 85 | int inuse; |
bcbabae8 | 86 | |
7055e687 | 87 | uint16_t vector; |
967f97fa | 88 | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq); |
1cbdabe2 MT |
89 | VirtIODevice *vdev; |
90 | EventNotifier guest_notifier; | |
91 | EventNotifier host_notifier; | |
e0d686bf | 92 | QLIST_ENTRY(VirtQueue) node; |
967f97fa AL |
93 | }; |
94 | ||
967f97fa | 95 | /* virt queue functions */ |
ab223c95 | 96 | void virtio_queue_update_rings(VirtIODevice *vdev, int n) |
967f97fa | 97 | { |
ab223c95 | 98 | VRing *vring = &vdev->vq[n].vring; |
53c25cea | 99 | |
ab223c95 CH |
100 | if (!vring->desc) { |
101 | /* not yet setup -> nothing to do */ | |
102 | return; | |
103 | } | |
104 | vring->avail = vring->desc + vring->num * sizeof(VRingDesc); | |
105 | vring->used = vring_align(vring->avail + | |
106 | offsetof(VRingAvail, ring[vring->num]), | |
107 | vring->align); | |
967f97fa AL |
108 | } |
109 | ||
cee3ca00 RR |
110 | static inline uint64_t vring_desc_addr(VirtIODevice *vdev, hwaddr desc_pa, |
111 | int i) | |
967f97fa | 112 | { |
a8170e5e | 113 | hwaddr pa; |
5774cf98 | 114 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr); |
cee3ca00 | 115 | return virtio_ldq_phys(vdev, pa); |
967f97fa AL |
116 | } |
117 | ||
cee3ca00 | 118 | static inline uint32_t vring_desc_len(VirtIODevice *vdev, hwaddr desc_pa, int i) |
967f97fa | 119 | { |
a8170e5e | 120 | hwaddr pa; |
5774cf98 | 121 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len); |
cee3ca00 | 122 | return virtio_ldl_phys(vdev, pa); |
967f97fa AL |
123 | } |
124 | ||
cee3ca00 RR |
125 | static inline uint16_t vring_desc_flags(VirtIODevice *vdev, hwaddr desc_pa, |
126 | int i) | |
967f97fa | 127 | { |
a8170e5e | 128 | hwaddr pa; |
5774cf98 | 129 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags); |
cee3ca00 | 130 | return virtio_lduw_phys(vdev, pa); |
967f97fa AL |
131 | } |
132 | ||
cee3ca00 RR |
133 | static inline uint16_t vring_desc_next(VirtIODevice *vdev, hwaddr desc_pa, |
134 | int i) | |
967f97fa | 135 | { |
a8170e5e | 136 | hwaddr pa; |
5774cf98 | 137 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next); |
cee3ca00 | 138 | return virtio_lduw_phys(vdev, pa); |
967f97fa AL |
139 | } |
140 | ||
141 | static inline uint16_t vring_avail_flags(VirtQueue *vq) | |
142 | { | |
a8170e5e | 143 | hwaddr pa; |
967f97fa | 144 | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
cee3ca00 | 145 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
146 | } |
147 | ||
148 | static inline uint16_t vring_avail_idx(VirtQueue *vq) | |
149 | { | |
a8170e5e | 150 | hwaddr pa; |
967f97fa | 151 | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
cee3ca00 | 152 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
153 | } |
154 | ||
155 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) | |
156 | { | |
a8170e5e | 157 | hwaddr pa; |
967f97fa | 158 | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
cee3ca00 | 159 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
160 | } |
161 | ||
e9600c6c | 162 | static inline uint16_t vring_get_used_event(VirtQueue *vq) |
bcbabae8 MT |
163 | { |
164 | return vring_avail_ring(vq, vq->vring.num); | |
165 | } | |
166 | ||
967f97fa AL |
167 | static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
168 | { | |
a8170e5e | 169 | hwaddr pa; |
967f97fa | 170 | pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
cee3ca00 | 171 | virtio_stl_phys(vq->vdev, pa, val); |
967f97fa AL |
172 | } |
173 | ||
174 | static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) | |
175 | { | |
a8170e5e | 176 | hwaddr pa; |
967f97fa | 177 | pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
cee3ca00 | 178 | virtio_stl_phys(vq->vdev, pa, val); |
967f97fa AL |
179 | } |
180 | ||
181 | static uint16_t vring_used_idx(VirtQueue *vq) | |
182 | { | |
a8170e5e | 183 | hwaddr pa; |
967f97fa | 184 | pa = vq->vring.used + offsetof(VRingUsed, idx); |
cee3ca00 | 185 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
186 | } |
187 | ||
bcbabae8 | 188 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
967f97fa | 189 | { |
a8170e5e | 190 | hwaddr pa; |
967f97fa | 191 | pa = vq->vring.used + offsetof(VRingUsed, idx); |
cee3ca00 | 192 | virtio_stw_phys(vq->vdev, pa, val); |
967f97fa AL |
193 | } |
194 | ||
195 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) | |
196 | { | |
cee3ca00 | 197 | VirtIODevice *vdev = vq->vdev; |
a8170e5e | 198 | hwaddr pa; |
967f97fa | 199 | pa = vq->vring.used + offsetof(VRingUsed, flags); |
cee3ca00 | 200 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) | mask); |
967f97fa AL |
201 | } |
202 | ||
203 | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) | |
204 | { | |
cee3ca00 | 205 | VirtIODevice *vdev = vq->vdev; |
a8170e5e | 206 | hwaddr pa; |
967f97fa | 207 | pa = vq->vring.used + offsetof(VRingUsed, flags); |
cee3ca00 | 208 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) & ~mask); |
967f97fa AL |
209 | } |
210 | ||
e9600c6c | 211 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) |
bcbabae8 | 212 | { |
a8170e5e | 213 | hwaddr pa; |
bcbabae8 MT |
214 | if (!vq->notification) { |
215 | return; | |
216 | } | |
217 | pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]); | |
cee3ca00 | 218 | virtio_stw_phys(vq->vdev, pa, val); |
bcbabae8 MT |
219 | } |
220 | ||
967f97fa AL |
221 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
222 | { | |
bcbabae8 | 223 | vq->notification = enable; |
95129d6f | 224 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 225 | vring_set_avail_event(vq, vring_avail_idx(vq)); |
bcbabae8 | 226 | } else if (enable) { |
967f97fa | 227 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 228 | } else { |
967f97fa | 229 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 230 | } |
92045d80 MT |
231 | if (enable) { |
232 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
233 | smp_mb(); | |
234 | } | |
967f97fa AL |
235 | } |
236 | ||
237 | int virtio_queue_ready(VirtQueue *vq) | |
238 | { | |
239 | return vq->vring.avail != 0; | |
240 | } | |
241 | ||
242 | int virtio_queue_empty(VirtQueue *vq) | |
243 | { | |
244 | return vring_avail_idx(vq) == vq->last_avail_idx; | |
245 | } | |
246 | ||
ce317461 JW |
247 | static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, |
248 | unsigned int len) | |
967f97fa AL |
249 | { |
250 | unsigned int offset; | |
251 | int i; | |
252 | ||
967f97fa AL |
253 | offset = 0; |
254 | for (i = 0; i < elem->in_num; i++) { | |
255 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); | |
256 | ||
26b258e1 AL |
257 | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
258 | elem->in_sg[i].iov_len, | |
259 | 1, size); | |
967f97fa | 260 | |
0cea71a2 | 261 | offset += size; |
967f97fa AL |
262 | } |
263 | ||
26b258e1 AL |
264 | for (i = 0; i < elem->out_num; i++) |
265 | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, | |
266 | elem->out_sg[i].iov_len, | |
267 | 0, elem->out_sg[i].iov_len); | |
ce317461 JW |
268 | } |
269 | ||
270 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, | |
271 | unsigned int len, unsigned int idx) | |
272 | { | |
273 | trace_virtqueue_fill(vq, elem, len, idx); | |
274 | ||
275 | virtqueue_unmap_sg(vq, elem, len); | |
26b258e1 | 276 | |
967f97fa AL |
277 | idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
278 | ||
279 | /* Get a pointer to the next entry in the used ring. */ | |
280 | vring_used_ring_id(vq, idx, elem->index); | |
281 | vring_used_ring_len(vq, idx, len); | |
282 | } | |
283 | ||
284 | void virtqueue_flush(VirtQueue *vq, unsigned int count) | |
285 | { | |
bcbabae8 | 286 | uint16_t old, new; |
967f97fa | 287 | /* Make sure buffer is written before we update index. */ |
b90d2f35 | 288 | smp_wmb(); |
64979a4d | 289 | trace_virtqueue_flush(vq, count); |
bcbabae8 MT |
290 | old = vring_used_idx(vq); |
291 | new = old + count; | |
292 | vring_used_idx_set(vq, new); | |
967f97fa | 293 | vq->inuse -= count; |
bcbabae8 MT |
294 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) |
295 | vq->signalled_used_valid = false; | |
967f97fa AL |
296 | } |
297 | ||
298 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, | |
299 | unsigned int len) | |
300 | { | |
301 | virtqueue_fill(vq, elem, len, 0); | |
302 | virtqueue_flush(vq, 1); | |
303 | } | |
304 | ||
305 | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) | |
306 | { | |
307 | uint16_t num_heads = vring_avail_idx(vq) - idx; | |
308 | ||
309 | /* Check it isn't doing very strange things with descriptor numbers. */ | |
bb6834cf | 310 | if (num_heads > vq->vring.num) { |
ce67ed65 SH |
311 | error_report("Guest moved used index from %u to %u", |
312 | idx, vring_avail_idx(vq)); | |
bb6834cf AL |
313 | exit(1); |
314 | } | |
a821ce59 MT |
315 | /* On success, callers read a descriptor at vq->last_avail_idx. |
316 | * Make sure descriptor read does not bypass avail index read. */ | |
317 | if (num_heads) { | |
318 | smp_rmb(); | |
319 | } | |
967f97fa AL |
320 | |
321 | return num_heads; | |
322 | } | |
323 | ||
324 | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) | |
325 | { | |
326 | unsigned int head; | |
327 | ||
328 | /* Grab the next descriptor number they're advertising, and increment | |
329 | * the index we've seen. */ | |
330 | head = vring_avail_ring(vq, idx % vq->vring.num); | |
331 | ||
332 | /* If their number is silly, that's a fatal mistake. */ | |
bb6834cf | 333 | if (head >= vq->vring.num) { |
ce67ed65 | 334 | error_report("Guest says index %u is available", head); |
bb6834cf AL |
335 | exit(1); |
336 | } | |
967f97fa AL |
337 | |
338 | return head; | |
339 | } | |
340 | ||
cee3ca00 | 341 | static unsigned virtqueue_next_desc(VirtIODevice *vdev, hwaddr desc_pa, |
5774cf98 | 342 | unsigned int i, unsigned int max) |
967f97fa AL |
343 | { |
344 | unsigned int next; | |
345 | ||
346 | /* If this descriptor says it doesn't chain, we're done. */ | |
cee3ca00 | 347 | if (!(vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_NEXT)) { |
5774cf98 | 348 | return max; |
cee3ca00 | 349 | } |
967f97fa AL |
350 | |
351 | /* Check they're not leading us off end of descriptors. */ | |
cee3ca00 | 352 | next = vring_desc_next(vdev, desc_pa, i); |
967f97fa | 353 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
b90d2f35 | 354 | smp_wmb(); |
967f97fa | 355 | |
5774cf98 | 356 | if (next >= max) { |
ce67ed65 | 357 | error_report("Desc next is %u", next); |
bb6834cf AL |
358 | exit(1); |
359 | } | |
967f97fa AL |
360 | |
361 | return next; | |
362 | } | |
363 | ||
0d8d7690 | 364 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, |
e1f7b481 MT |
365 | unsigned int *out_bytes, |
366 | unsigned max_in_bytes, unsigned max_out_bytes) | |
967f97fa | 367 | { |
efeea6d0 | 368 | unsigned int idx; |
385ce95d | 369 | unsigned int total_bufs, in_total, out_total; |
967f97fa AL |
370 | |
371 | idx = vq->last_avail_idx; | |
372 | ||
efeea6d0 | 373 | total_bufs = in_total = out_total = 0; |
967f97fa | 374 | while (virtqueue_num_heads(vq, idx)) { |
cee3ca00 | 375 | VirtIODevice *vdev = vq->vdev; |
efeea6d0 | 376 | unsigned int max, num_bufs, indirect = 0; |
a8170e5e | 377 | hwaddr desc_pa; |
967f97fa AL |
378 | int i; |
379 | ||
efeea6d0 MM |
380 | max = vq->vring.num; |
381 | num_bufs = total_bufs; | |
967f97fa | 382 | i = virtqueue_get_head(vq, idx++); |
efeea6d0 MM |
383 | desc_pa = vq->vring.desc; |
384 | ||
cee3ca00 RR |
385 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) { |
386 | if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) { | |
ce67ed65 | 387 | error_report("Invalid size for indirect buffer table"); |
efeea6d0 MM |
388 | exit(1); |
389 | } | |
390 | ||
391 | /* If we've got too many, that implies a descriptor loop. */ | |
392 | if (num_bufs >= max) { | |
ce67ed65 | 393 | error_report("Looped descriptor"); |
efeea6d0 MM |
394 | exit(1); |
395 | } | |
396 | ||
397 | /* loop over the indirect descriptor table */ | |
398 | indirect = 1; | |
cee3ca00 RR |
399 | max = vring_desc_len(vdev, desc_pa, i) / sizeof(VRingDesc); |
400 | desc_pa = vring_desc_addr(vdev, desc_pa, i); | |
1ae2757c | 401 | num_bufs = i = 0; |
efeea6d0 MM |
402 | } |
403 | ||
967f97fa AL |
404 | do { |
405 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 406 | if (++num_bufs > max) { |
ce67ed65 | 407 | error_report("Looped descriptor"); |
bb6834cf AL |
408 | exit(1); |
409 | } | |
967f97fa | 410 | |
cee3ca00 RR |
411 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_WRITE) { |
412 | in_total += vring_desc_len(vdev, desc_pa, i); | |
967f97fa | 413 | } else { |
cee3ca00 | 414 | out_total += vring_desc_len(vdev, desc_pa, i); |
967f97fa | 415 | } |
e1f7b481 MT |
416 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
417 | goto done; | |
418 | } | |
cee3ca00 | 419 | } while ((i = virtqueue_next_desc(vdev, desc_pa, i, max)) != max); |
efeea6d0 MM |
420 | |
421 | if (!indirect) | |
422 | total_bufs = num_bufs; | |
423 | else | |
424 | total_bufs++; | |
967f97fa | 425 | } |
e1f7b481 | 426 | done: |
0d8d7690 AS |
427 | if (in_bytes) { |
428 | *in_bytes = in_total; | |
429 | } | |
430 | if (out_bytes) { | |
431 | *out_bytes = out_total; | |
432 | } | |
433 | } | |
967f97fa | 434 | |
0d8d7690 AS |
435 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
436 | unsigned int out_bytes) | |
437 | { | |
438 | unsigned int in_total, out_total; | |
439 | ||
e1f7b481 MT |
440 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); |
441 | return in_bytes <= in_total && out_bytes <= out_total; | |
967f97fa AL |
442 | } |
443 | ||
a8170e5e | 444 | void virtqueue_map_sg(struct iovec *sg, hwaddr *addr, |
42fb2e07 KW |
445 | size_t num_sg, int is_write) |
446 | { | |
447 | unsigned int i; | |
a8170e5e | 448 | hwaddr len; |
42fb2e07 | 449 | |
93725140 | 450 | if (num_sg > VIRTQUEUE_MAX_SIZE) { |
36cf2a37 MT |
451 | error_report("virtio: map attempt out of bounds: %zd > %d", |
452 | num_sg, VIRTQUEUE_MAX_SIZE); | |
453 | exit(1); | |
454 | } | |
455 | ||
42fb2e07 KW |
456 | for (i = 0; i < num_sg; i++) { |
457 | len = sg[i].iov_len; | |
458 | sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); | |
459 | if (sg[i].iov_base == NULL || len != sg[i].iov_len) { | |
1a285899 | 460 | error_report("virtio: error trying to map MMIO memory"); |
42fb2e07 KW |
461 | exit(1); |
462 | } | |
463 | } | |
464 | } | |
465 | ||
967f97fa AL |
466 | int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem) |
467 | { | |
5774cf98 | 468 | unsigned int i, head, max; |
a8170e5e | 469 | hwaddr desc_pa = vq->vring.desc; |
cee3ca00 | 470 | VirtIODevice *vdev = vq->vdev; |
967f97fa AL |
471 | |
472 | if (!virtqueue_num_heads(vq, vq->last_avail_idx)) | |
473 | return 0; | |
474 | ||
475 | /* When we start there are none of either input nor output. */ | |
476 | elem->out_num = elem->in_num = 0; | |
477 | ||
5774cf98 MM |
478 | max = vq->vring.num; |
479 | ||
967f97fa | 480 | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
95129d6f | 481 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 482 | vring_set_avail_event(vq, vq->last_avail_idx); |
bcbabae8 | 483 | } |
efeea6d0 | 484 | |
cee3ca00 RR |
485 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) { |
486 | if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) { | |
ce67ed65 | 487 | error_report("Invalid size for indirect buffer table"); |
efeea6d0 MM |
488 | exit(1); |
489 | } | |
490 | ||
491 | /* loop over the indirect descriptor table */ | |
cee3ca00 RR |
492 | max = vring_desc_len(vdev, desc_pa, i) / sizeof(VRingDesc); |
493 | desc_pa = vring_desc_addr(vdev, desc_pa, i); | |
efeea6d0 MM |
494 | i = 0; |
495 | } | |
496 | ||
42fb2e07 | 497 | /* Collect all the descriptors */ |
967f97fa AL |
498 | do { |
499 | struct iovec *sg; | |
500 | ||
cee3ca00 | 501 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_WRITE) { |
c8eac1cf MT |
502 | if (elem->in_num >= ARRAY_SIZE(elem->in_sg)) { |
503 | error_report("Too many write descriptors in indirect table"); | |
504 | exit(1); | |
505 | } | |
cee3ca00 | 506 | elem->in_addr[elem->in_num] = vring_desc_addr(vdev, desc_pa, i); |
967f97fa | 507 | sg = &elem->in_sg[elem->in_num++]; |
42fb2e07 | 508 | } else { |
c8eac1cf MT |
509 | if (elem->out_num >= ARRAY_SIZE(elem->out_sg)) { |
510 | error_report("Too many read descriptors in indirect table"); | |
511 | exit(1); | |
512 | } | |
cee3ca00 | 513 | elem->out_addr[elem->out_num] = vring_desc_addr(vdev, desc_pa, i); |
967f97fa | 514 | sg = &elem->out_sg[elem->out_num++]; |
42fb2e07 | 515 | } |
967f97fa | 516 | |
cee3ca00 | 517 | sg->iov_len = vring_desc_len(vdev, desc_pa, i); |
967f97fa AL |
518 | |
519 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 520 | if ((elem->in_num + elem->out_num) > max) { |
ce67ed65 | 521 | error_report("Looped descriptor"); |
bb6834cf AL |
522 | exit(1); |
523 | } | |
cee3ca00 | 524 | } while ((i = virtqueue_next_desc(vdev, desc_pa, i, max)) != max); |
967f97fa | 525 | |
42fb2e07 KW |
526 | /* Now map what we have collected */ |
527 | virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1); | |
528 | virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0); | |
529 | ||
967f97fa AL |
530 | elem->index = head; |
531 | ||
532 | vq->inuse++; | |
533 | ||
64979a4d | 534 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
967f97fa AL |
535 | return elem->in_num + elem->out_num; |
536 | } | |
537 | ||
538 | /* virtio device */ | |
7055e687 MT |
539 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
540 | { | |
1c819449 FK |
541 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
542 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
543 | ||
544 | if (k->notify) { | |
545 | k->notify(qbus->parent, vector); | |
7055e687 MT |
546 | } |
547 | } | |
967f97fa | 548 | |
53c25cea | 549 | void virtio_update_irq(VirtIODevice *vdev) |
967f97fa | 550 | { |
7055e687 | 551 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
967f97fa AL |
552 | } |
553 | ||
0b352fd6 CH |
554 | static int virtio_validate_features(VirtIODevice *vdev) |
555 | { | |
556 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
557 | ||
558 | if (k->validate_features) { | |
559 | return k->validate_features(vdev); | |
560 | } else { | |
561 | return 0; | |
562 | } | |
563 | } | |
564 | ||
565 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) | |
4e1837f8 | 566 | { |
181103cd | 567 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
4e1837f8 SH |
568 | trace_virtio_set_status(vdev, val); |
569 | ||
95129d6f | 570 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
0b352fd6 CH |
571 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && |
572 | val & VIRTIO_CONFIG_S_FEATURES_OK) { | |
573 | int ret = virtio_validate_features(vdev); | |
574 | ||
575 | if (ret) { | |
576 | return ret; | |
577 | } | |
578 | } | |
579 | } | |
181103cd FK |
580 | if (k->set_status) { |
581 | k->set_status(vdev, val); | |
4e1837f8 SH |
582 | } |
583 | vdev->status = val; | |
0b352fd6 | 584 | return 0; |
4e1837f8 SH |
585 | } |
586 | ||
616a6552 GK |
587 | bool target_words_bigendian(void); |
588 | static enum virtio_device_endian virtio_default_endian(void) | |
589 | { | |
590 | if (target_words_bigendian()) { | |
591 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
592 | } else { | |
593 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
594 | } | |
595 | } | |
596 | ||
597 | static enum virtio_device_endian virtio_current_cpu_endian(void) | |
598 | { | |
599 | CPUClass *cc = CPU_GET_CLASS(current_cpu); | |
600 | ||
601 | if (cc->virtio_is_big_endian(current_cpu)) { | |
602 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
603 | } else { | |
604 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
605 | } | |
606 | } | |
607 | ||
53c25cea | 608 | void virtio_reset(void *opaque) |
967f97fa AL |
609 | { |
610 | VirtIODevice *vdev = opaque; | |
181103cd | 611 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
612 | int i; |
613 | ||
e0c472d8 | 614 | virtio_set_status(vdev, 0); |
616a6552 GK |
615 | if (current_cpu) { |
616 | /* Guest initiated reset */ | |
617 | vdev->device_endian = virtio_current_cpu_endian(); | |
618 | } else { | |
619 | /* System reset */ | |
620 | vdev->device_endian = virtio_default_endian(); | |
621 | } | |
e0c472d8 | 622 | |
181103cd FK |
623 | if (k->reset) { |
624 | k->reset(vdev); | |
625 | } | |
967f97fa | 626 | |
704a76fc | 627 | vdev->guest_features = 0; |
967f97fa AL |
628 | vdev->queue_sel = 0; |
629 | vdev->status = 0; | |
630 | vdev->isr = 0; | |
7055e687 MT |
631 | vdev->config_vector = VIRTIO_NO_VECTOR; |
632 | virtio_notify_vector(vdev, vdev->config_vector); | |
967f97fa | 633 | |
87b3bd1c | 634 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
635 | vdev->vq[i].vring.desc = 0; |
636 | vdev->vq[i].vring.avail = 0; | |
637 | vdev->vq[i].vring.used = 0; | |
638 | vdev->vq[i].last_avail_idx = 0; | |
e0d686bf | 639 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); |
bcbabae8 MT |
640 | vdev->vq[i].signalled_used = 0; |
641 | vdev->vq[i].signalled_used_valid = false; | |
642 | vdev->vq[i].notification = true; | |
46c5d082 | 643 | vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; |
967f97fa AL |
644 | } |
645 | } | |
646 | ||
53c25cea | 647 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 648 | { |
181103cd | 649 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
650 | uint8_t val; |
651 | ||
5f5a1318 | 652 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 653 | return (uint32_t)-1; |
5f5a1318 JW |
654 | } |
655 | ||
656 | k->get_config(vdev, vdev->config); | |
967f97fa | 657 | |
06dbfc6f | 658 | val = ldub_p(vdev->config + addr); |
967f97fa AL |
659 | return val; |
660 | } | |
661 | ||
53c25cea | 662 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 663 | { |
181103cd | 664 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
665 | uint16_t val; |
666 | ||
5f5a1318 | 667 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 668 | return (uint32_t)-1; |
5f5a1318 JW |
669 | } |
670 | ||
671 | k->get_config(vdev, vdev->config); | |
967f97fa | 672 | |
06dbfc6f | 673 | val = lduw_p(vdev->config + addr); |
967f97fa AL |
674 | return val; |
675 | } | |
676 | ||
53c25cea | 677 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 678 | { |
181103cd | 679 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
680 | uint32_t val; |
681 | ||
5f5a1318 | 682 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 683 | return (uint32_t)-1; |
5f5a1318 JW |
684 | } |
685 | ||
686 | k->get_config(vdev, vdev->config); | |
967f97fa | 687 | |
06dbfc6f | 688 | val = ldl_p(vdev->config + addr); |
967f97fa AL |
689 | return val; |
690 | } | |
691 | ||
53c25cea | 692 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 693 | { |
181103cd | 694 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
695 | uint8_t val = data; |
696 | ||
5f5a1318 | 697 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 698 | return; |
5f5a1318 | 699 | } |
967f97fa | 700 | |
06dbfc6f | 701 | stb_p(vdev->config + addr, val); |
967f97fa | 702 | |
181103cd FK |
703 | if (k->set_config) { |
704 | k->set_config(vdev, vdev->config); | |
705 | } | |
967f97fa AL |
706 | } |
707 | ||
53c25cea | 708 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 709 | { |
181103cd | 710 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
711 | uint16_t val = data; |
712 | ||
5f5a1318 | 713 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 714 | return; |
5f5a1318 | 715 | } |
967f97fa | 716 | |
06dbfc6f | 717 | stw_p(vdev->config + addr, val); |
967f97fa | 718 | |
181103cd FK |
719 | if (k->set_config) { |
720 | k->set_config(vdev, vdev->config); | |
721 | } | |
967f97fa AL |
722 | } |
723 | ||
53c25cea | 724 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 725 | { |
181103cd | 726 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
727 | uint32_t val = data; |
728 | ||
5f5a1318 | 729 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 730 | return; |
5f5a1318 | 731 | } |
967f97fa | 732 | |
06dbfc6f | 733 | stl_p(vdev->config + addr, val); |
967f97fa | 734 | |
181103cd FK |
735 | if (k->set_config) { |
736 | k->set_config(vdev, vdev->config); | |
737 | } | |
967f97fa AL |
738 | } |
739 | ||
adfb743c MT |
740 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr) |
741 | { | |
742 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
743 | uint8_t val; | |
744 | ||
745 | if (addr + sizeof(val) > vdev->config_len) { | |
746 | return (uint32_t)-1; | |
747 | } | |
748 | ||
749 | k->get_config(vdev, vdev->config); | |
750 | ||
751 | val = ldub_p(vdev->config + addr); | |
752 | return val; | |
753 | } | |
754 | ||
755 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr) | |
756 | { | |
757 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
758 | uint16_t val; | |
759 | ||
760 | if (addr + sizeof(val) > vdev->config_len) { | |
761 | return (uint32_t)-1; | |
762 | } | |
763 | ||
764 | k->get_config(vdev, vdev->config); | |
765 | ||
766 | val = lduw_le_p(vdev->config + addr); | |
767 | return val; | |
768 | } | |
769 | ||
770 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr) | |
771 | { | |
772 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
773 | uint32_t val; | |
774 | ||
775 | if (addr + sizeof(val) > vdev->config_len) { | |
776 | return (uint32_t)-1; | |
777 | } | |
778 | ||
779 | k->get_config(vdev, vdev->config); | |
780 | ||
781 | val = ldl_le_p(vdev->config + addr); | |
782 | return val; | |
783 | } | |
784 | ||
785 | void virtio_config_modern_writeb(VirtIODevice *vdev, | |
786 | uint32_t addr, uint32_t data) | |
787 | { | |
788 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
789 | uint8_t val = data; | |
790 | ||
791 | if (addr + sizeof(val) > vdev->config_len) { | |
792 | return; | |
793 | } | |
794 | ||
795 | stb_p(vdev->config + addr, val); | |
796 | ||
797 | if (k->set_config) { | |
798 | k->set_config(vdev, vdev->config); | |
799 | } | |
800 | } | |
801 | ||
802 | void virtio_config_modern_writew(VirtIODevice *vdev, | |
803 | uint32_t addr, uint32_t data) | |
804 | { | |
805 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
806 | uint16_t val = data; | |
807 | ||
808 | if (addr + sizeof(val) > vdev->config_len) { | |
809 | return; | |
810 | } | |
811 | ||
812 | stw_le_p(vdev->config + addr, val); | |
813 | ||
814 | if (k->set_config) { | |
815 | k->set_config(vdev, vdev->config); | |
816 | } | |
817 | } | |
818 | ||
819 | void virtio_config_modern_writel(VirtIODevice *vdev, | |
820 | uint32_t addr, uint32_t data) | |
821 | { | |
822 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
823 | uint32_t val = data; | |
824 | ||
825 | if (addr + sizeof(val) > vdev->config_len) { | |
826 | return; | |
827 | } | |
828 | ||
829 | stl_le_p(vdev->config + addr, val); | |
830 | ||
831 | if (k->set_config) { | |
832 | k->set_config(vdev, vdev->config); | |
833 | } | |
834 | } | |
835 | ||
a8170e5e | 836 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) |
967f97fa | 837 | { |
ab223c95 CH |
838 | vdev->vq[n].vring.desc = addr; |
839 | virtio_queue_update_rings(vdev, n); | |
53c25cea PB |
840 | } |
841 | ||
a8170e5e | 842 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) |
53c25cea | 843 | { |
ab223c95 CH |
844 | return vdev->vq[n].vring.desc; |
845 | } | |
846 | ||
847 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, | |
848 | hwaddr avail, hwaddr used) | |
849 | { | |
850 | vdev->vq[n].vring.desc = desc; | |
851 | vdev->vq[n].vring.avail = avail; | |
852 | vdev->vq[n].vring.used = used; | |
53c25cea PB |
853 | } |
854 | ||
e63c0ba1 PM |
855 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) |
856 | { | |
f6049f44 PM |
857 | /* Don't allow guest to flip queue between existent and |
858 | * nonexistent states, or to set it to an invalid size. | |
859 | */ | |
860 | if (!!num != !!vdev->vq[n].vring.num || | |
861 | num > VIRTQUEUE_MAX_SIZE || | |
862 | num < 0) { | |
863 | return; | |
e63c0ba1 | 864 | } |
f6049f44 | 865 | vdev->vq[n].vring.num = num; |
e63c0ba1 PM |
866 | } |
867 | ||
e0d686bf JW |
868 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) |
869 | { | |
870 | return QLIST_FIRST(&vdev->vector_queues[vector]); | |
871 | } | |
872 | ||
873 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) | |
874 | { | |
875 | return QLIST_NEXT(vq, node); | |
876 | } | |
877 | ||
53c25cea PB |
878 | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
879 | { | |
880 | return vdev->vq[n].vring.num; | |
881 | } | |
967f97fa | 882 | |
8ad176aa JW |
883 | int virtio_get_num_queues(VirtIODevice *vdev) |
884 | { | |
885 | int i; | |
886 | ||
87b3bd1c | 887 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
8ad176aa JW |
888 | if (!virtio_queue_get_num(vdev, i)) { |
889 | break; | |
890 | } | |
891 | } | |
892 | ||
893 | return i; | |
894 | } | |
895 | ||
c80decdb PB |
896 | int virtio_queue_get_id(VirtQueue *vq) |
897 | { | |
898 | VirtIODevice *vdev = vq->vdev; | |
87b3bd1c | 899 | assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_QUEUE_MAX]); |
c80decdb PB |
900 | return vq - &vdev->vq[0]; |
901 | } | |
902 | ||
6ce69d1c PM |
903 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) |
904 | { | |
905 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
906 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
907 | ||
ab223c95 | 908 | /* virtio-1 compliant devices cannot change the alignment */ |
95129d6f | 909 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
ab223c95 CH |
910 | error_report("tried to modify queue alignment for virtio-1 device"); |
911 | return; | |
912 | } | |
6ce69d1c PM |
913 | /* Check that the transport told us it was going to do this |
914 | * (so a buggy transport will immediately assert rather than | |
915 | * silently failing to migrate this state) | |
916 | */ | |
917 | assert(k->has_variable_vring_alignment); | |
918 | ||
919 | vdev->vq[n].vring.align = align; | |
ab223c95 | 920 | virtio_queue_update_rings(vdev, n); |
6ce69d1c PM |
921 | } |
922 | ||
25db9ebe SH |
923 | void virtio_queue_notify_vq(VirtQueue *vq) |
924 | { | |
9e0f5b81 | 925 | if (vq->vring.desc && vq->handle_output) { |
25db9ebe | 926 | VirtIODevice *vdev = vq->vdev; |
9e0f5b81 | 927 | |
25db9ebe SH |
928 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
929 | vq->handle_output(vdev, vq); | |
930 | } | |
931 | } | |
932 | ||
53c25cea PB |
933 | void virtio_queue_notify(VirtIODevice *vdev, int n) |
934 | { | |
7157e2e2 | 935 | virtio_queue_notify_vq(&vdev->vq[n]); |
967f97fa AL |
936 | } |
937 | ||
7055e687 MT |
938 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) |
939 | { | |
87b3bd1c | 940 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : |
7055e687 MT |
941 | VIRTIO_NO_VECTOR; |
942 | } | |
943 | ||
944 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) | |
945 | { | |
e0d686bf JW |
946 | VirtQueue *vq = &vdev->vq[n]; |
947 | ||
87b3bd1c | 948 | if (n < VIRTIO_QUEUE_MAX) { |
e0d686bf JW |
949 | if (vdev->vector_queues && |
950 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { | |
951 | QLIST_REMOVE(vq, node); | |
952 | } | |
7055e687 | 953 | vdev->vq[n].vector = vector; |
e0d686bf JW |
954 | if (vdev->vector_queues && |
955 | vector != VIRTIO_NO_VECTOR) { | |
956 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); | |
957 | } | |
958 | } | |
7055e687 MT |
959 | } |
960 | ||
967f97fa AL |
961 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, |
962 | void (*handle_output)(VirtIODevice *, VirtQueue *)) | |
963 | { | |
964 | int i; | |
965 | ||
87b3bd1c | 966 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
967 | if (vdev->vq[i].vring.num == 0) |
968 | break; | |
969 | } | |
970 | ||
87b3bd1c | 971 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) |
967f97fa AL |
972 | abort(); |
973 | ||
974 | vdev->vq[i].vring.num = queue_size; | |
46c5d082 | 975 | vdev->vq[i].vring.num_default = queue_size; |
6ce69d1c | 976 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; |
967f97fa AL |
977 | vdev->vq[i].handle_output = handle_output; |
978 | ||
979 | return &vdev->vq[i]; | |
980 | } | |
981 | ||
f23fd811 JW |
982 | void virtio_del_queue(VirtIODevice *vdev, int n) |
983 | { | |
87b3bd1c | 984 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { |
f23fd811 JW |
985 | abort(); |
986 | } | |
987 | ||
988 | vdev->vq[n].vring.num = 0; | |
46c5d082 | 989 | vdev->vq[n].vring.num_default = 0; |
f23fd811 JW |
990 | } |
991 | ||
1cbdabe2 MT |
992 | void virtio_irq(VirtQueue *vq) |
993 | { | |
64979a4d | 994 | trace_virtio_irq(vq); |
1cbdabe2 MT |
995 | vq->vdev->isr |= 0x01; |
996 | virtio_notify_vector(vq->vdev, vq->vector); | |
997 | } | |
998 | ||
bcbabae8 MT |
999 | static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq) |
1000 | { | |
1001 | uint16_t old, new; | |
1002 | bool v; | |
a281ebc1 MT |
1003 | /* We need to expose used array entries before checking used event. */ |
1004 | smp_mb(); | |
97b83deb | 1005 | /* Always notify when queue is empty (when feature acknowledge) */ |
95129d6f | 1006 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && |
ef546f12 | 1007 | !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx) { |
bcbabae8 MT |
1008 | return true; |
1009 | } | |
1010 | ||
95129d6f | 1011 | if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
bcbabae8 MT |
1012 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); |
1013 | } | |
1014 | ||
1015 | v = vq->signalled_used_valid; | |
1016 | vq->signalled_used_valid = true; | |
1017 | old = vq->signalled_used; | |
1018 | new = vq->signalled_used = vring_used_idx(vq); | |
e9600c6c | 1019 | return !v || vring_need_event(vring_get_used_event(vq), new, old); |
bcbabae8 MT |
1020 | } |
1021 | ||
1022 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) | |
1023 | { | |
1024 | if (!vring_notify(vdev, vq)) { | |
967f97fa | 1025 | return; |
bcbabae8 | 1026 | } |
967f97fa | 1027 | |
64979a4d | 1028 | trace_virtio_notify(vdev, vq); |
967f97fa | 1029 | vdev->isr |= 0x01; |
7055e687 | 1030 | virtio_notify_vector(vdev, vq->vector); |
967f97fa AL |
1031 | } |
1032 | ||
1033 | void virtio_notify_config(VirtIODevice *vdev) | |
1034 | { | |
7625162c AL |
1035 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) |
1036 | return; | |
1037 | ||
967f97fa | 1038 | vdev->isr |= 0x03; |
b8f05908 | 1039 | vdev->generation++; |
7055e687 | 1040 | virtio_notify_vector(vdev, vdev->config_vector); |
967f97fa AL |
1041 | } |
1042 | ||
616a6552 GK |
1043 | static bool virtio_device_endian_needed(void *opaque) |
1044 | { | |
1045 | VirtIODevice *vdev = opaque; | |
1046 | ||
1047 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); | |
95129d6f | 1048 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
3c185597 CH |
1049 | return vdev->device_endian != virtio_default_endian(); |
1050 | } | |
1051 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
1052 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; | |
616a6552 GK |
1053 | } |
1054 | ||
019a3edb GH |
1055 | static bool virtio_64bit_features_needed(void *opaque) |
1056 | { | |
1057 | VirtIODevice *vdev = opaque; | |
1058 | ||
1059 | return (vdev->host_features >> 32) != 0; | |
1060 | } | |
1061 | ||
74aae7b2 JW |
1062 | static bool virtio_virtqueue_needed(void *opaque) |
1063 | { | |
1064 | VirtIODevice *vdev = opaque; | |
1065 | ||
1066 | return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1); | |
1067 | } | |
1068 | ||
46c5d082 CH |
1069 | static bool virtio_ringsize_needed(void *opaque) |
1070 | { | |
1071 | VirtIODevice *vdev = opaque; | |
1072 | int i; | |
1073 | ||
1074 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1075 | if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) { | |
1076 | return true; | |
1077 | } | |
1078 | } | |
1079 | return false; | |
1080 | } | |
1081 | ||
74aae7b2 JW |
1082 | static void put_virtqueue_state(QEMUFile *f, void *pv, size_t size) |
1083 | { | |
1084 | VirtIODevice *vdev = pv; | |
1085 | int i; | |
1086 | ||
1087 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1088 | qemu_put_be64(f, vdev->vq[i].vring.avail); | |
1089 | qemu_put_be64(f, vdev->vq[i].vring.used); | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | static int get_virtqueue_state(QEMUFile *f, void *pv, size_t size) | |
1094 | { | |
1095 | VirtIODevice *vdev = pv; | |
1096 | int i; | |
1097 | ||
1098 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1099 | vdev->vq[i].vring.avail = qemu_get_be64(f); | |
1100 | vdev->vq[i].vring.used = qemu_get_be64(f); | |
1101 | } | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | static VMStateInfo vmstate_info_virtqueue = { | |
1106 | .name = "virtqueue_state", | |
1107 | .get = get_virtqueue_state, | |
1108 | .put = put_virtqueue_state, | |
1109 | }; | |
1110 | ||
1111 | static const VMStateDescription vmstate_virtio_virtqueues = { | |
1112 | .name = "virtio/virtqueues", | |
1113 | .version_id = 1, | |
1114 | .minimum_version_id = 1, | |
1115 | .needed = &virtio_virtqueue_needed, | |
1116 | .fields = (VMStateField[]) { | |
1117 | { | |
1118 | .name = "virtqueues", | |
1119 | .version_id = 0, | |
1120 | .field_exists = NULL, | |
1121 | .size = 0, | |
1122 | .info = &vmstate_info_virtqueue, | |
1123 | .flags = VMS_SINGLE, | |
1124 | .offset = 0, | |
1125 | }, | |
1126 | VMSTATE_END_OF_LIST() | |
1127 | } | |
1128 | }; | |
1129 | ||
46c5d082 CH |
1130 | static void put_ringsize_state(QEMUFile *f, void *pv, size_t size) |
1131 | { | |
1132 | VirtIODevice *vdev = pv; | |
1133 | int i; | |
1134 | ||
1135 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1136 | qemu_put_be32(f, vdev->vq[i].vring.num_default); | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | static int get_ringsize_state(QEMUFile *f, void *pv, size_t size) | |
1141 | { | |
1142 | VirtIODevice *vdev = pv; | |
1143 | int i; | |
1144 | ||
1145 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1146 | vdev->vq[i].vring.num_default = qemu_get_be32(f); | |
1147 | } | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | static VMStateInfo vmstate_info_ringsize = { | |
1152 | .name = "ringsize_state", | |
1153 | .get = get_ringsize_state, | |
1154 | .put = put_ringsize_state, | |
1155 | }; | |
1156 | ||
1157 | static const VMStateDescription vmstate_virtio_ringsize = { | |
1158 | .name = "virtio/ringsize", | |
1159 | .version_id = 1, | |
1160 | .minimum_version_id = 1, | |
1161 | .needed = &virtio_ringsize_needed, | |
1162 | .fields = (VMStateField[]) { | |
1163 | { | |
1164 | .name = "ringsize", | |
1165 | .version_id = 0, | |
1166 | .field_exists = NULL, | |
1167 | .size = 0, | |
1168 | .info = &vmstate_info_ringsize, | |
1169 | .flags = VMS_SINGLE, | |
1170 | .offset = 0, | |
1171 | }, | |
1172 | VMSTATE_END_OF_LIST() | |
1173 | } | |
1174 | }; | |
1175 | ||
616a6552 GK |
1176 | static const VMStateDescription vmstate_virtio_device_endian = { |
1177 | .name = "virtio/device_endian", | |
1178 | .version_id = 1, | |
1179 | .minimum_version_id = 1, | |
5cd8cada | 1180 | .needed = &virtio_device_endian_needed, |
616a6552 GK |
1181 | .fields = (VMStateField[]) { |
1182 | VMSTATE_UINT8(device_endian, VirtIODevice), | |
1183 | VMSTATE_END_OF_LIST() | |
1184 | } | |
1185 | }; | |
1186 | ||
019a3edb GH |
1187 | static const VMStateDescription vmstate_virtio_64bit_features = { |
1188 | .name = "virtio/64bit_features", | |
1189 | .version_id = 1, | |
1190 | .minimum_version_id = 1, | |
5cd8cada | 1191 | .needed = &virtio_64bit_features_needed, |
019a3edb GH |
1192 | .fields = (VMStateField[]) { |
1193 | VMSTATE_UINT64(guest_features, VirtIODevice), | |
1194 | VMSTATE_END_OF_LIST() | |
1195 | } | |
1196 | }; | |
1197 | ||
6b321a3d GK |
1198 | static const VMStateDescription vmstate_virtio = { |
1199 | .name = "virtio", | |
1200 | .version_id = 1, | |
1201 | .minimum_version_id = 1, | |
1202 | .minimum_version_id_old = 1, | |
1203 | .fields = (VMStateField[]) { | |
1204 | VMSTATE_END_OF_LIST() | |
616a6552 | 1205 | }, |
5cd8cada JQ |
1206 | .subsections = (const VMStateDescription*[]) { |
1207 | &vmstate_virtio_device_endian, | |
1208 | &vmstate_virtio_64bit_features, | |
74aae7b2 | 1209 | &vmstate_virtio_virtqueues, |
46c5d082 | 1210 | &vmstate_virtio_ringsize, |
5cd8cada | 1211 | NULL |
6b321a3d GK |
1212 | } |
1213 | }; | |
1214 | ||
967f97fa AL |
1215 | void virtio_save(VirtIODevice *vdev, QEMUFile *f) |
1216 | { | |
1c819449 FK |
1217 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1218 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 1219 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
019a3edb | 1220 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); |
967f97fa AL |
1221 | int i; |
1222 | ||
1c819449 FK |
1223 | if (k->save_config) { |
1224 | k->save_config(qbus->parent, f); | |
1225 | } | |
967f97fa | 1226 | |
967f97fa AL |
1227 | qemu_put_8s(f, &vdev->status); |
1228 | qemu_put_8s(f, &vdev->isr); | |
1229 | qemu_put_be16s(f, &vdev->queue_sel); | |
019a3edb | 1230 | qemu_put_be32s(f, &guest_features_lo); |
967f97fa AL |
1231 | qemu_put_be32(f, vdev->config_len); |
1232 | qemu_put_buffer(f, vdev->config, vdev->config_len); | |
1233 | ||
87b3bd1c | 1234 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1235 | if (vdev->vq[i].vring.num == 0) |
1236 | break; | |
1237 | } | |
1238 | ||
1239 | qemu_put_be32(f, i); | |
1240 | ||
87b3bd1c | 1241 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1242 | if (vdev->vq[i].vring.num == 0) |
1243 | break; | |
1244 | ||
1245 | qemu_put_be32(f, vdev->vq[i].vring.num); | |
6ce69d1c PM |
1246 | if (k->has_variable_vring_alignment) { |
1247 | qemu_put_be32(f, vdev->vq[i].vring.align); | |
1248 | } | |
ab223c95 CH |
1249 | /* XXX virtio-1 devices */ |
1250 | qemu_put_be64(f, vdev->vq[i].vring.desc); | |
967f97fa | 1251 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
1c819449 FK |
1252 | if (k->save_queue) { |
1253 | k->save_queue(qbus->parent, i, f); | |
1254 | } | |
967f97fa | 1255 | } |
1b5fc0de GK |
1256 | |
1257 | if (vdc->save != NULL) { | |
1258 | vdc->save(vdev, f); | |
1259 | } | |
6b321a3d GK |
1260 | |
1261 | /* Subsections */ | |
8118f095 | 1262 | vmstate_save_state(f, &vmstate_virtio, vdev, NULL); |
967f97fa AL |
1263 | } |
1264 | ||
6c0196d7 | 1265 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) |
ad0c9332 | 1266 | { |
181103cd | 1267 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
6b8f1020 | 1268 | bool bad = (val & ~(vdev->host_features)) != 0; |
ad0c9332 | 1269 | |
6b8f1020 | 1270 | val &= vdev->host_features; |
181103cd FK |
1271 | if (k->set_features) { |
1272 | k->set_features(vdev, val); | |
ad0c9332 PB |
1273 | } |
1274 | vdev->guest_features = val; | |
1275 | return bad ? -1 : 0; | |
1276 | } | |
1277 | ||
6c0196d7 CH |
1278 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) |
1279 | { | |
1280 | /* | |
1281 | * The driver must not attempt to set features after feature negotiation | |
1282 | * has finished. | |
1283 | */ | |
1284 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { | |
1285 | return -EINVAL; | |
1286 | } | |
1287 | return virtio_set_features_nocheck(vdev, val); | |
1288 | } | |
1289 | ||
1b5fc0de | 1290 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |
967f97fa | 1291 | { |
cc459952 | 1292 | int i, ret; |
a890a2f9 | 1293 | int32_t config_len; |
cc459952 | 1294 | uint32_t num; |
6d74ca5a | 1295 | uint32_t features; |
1c819449 FK |
1296 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1297 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 1298 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa | 1299 | |
616a6552 GK |
1300 | /* |
1301 | * We poison the endianness to ensure it does not get used before | |
1302 | * subsections have been loaded. | |
1303 | */ | |
1304 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; | |
1305 | ||
1c819449 FK |
1306 | if (k->load_config) { |
1307 | ret = k->load_config(qbus->parent, f); | |
ff24bd58 MT |
1308 | if (ret) |
1309 | return ret; | |
1310 | } | |
967f97fa | 1311 | |
967f97fa AL |
1312 | qemu_get_8s(f, &vdev->status); |
1313 | qemu_get_8s(f, &vdev->isr); | |
1314 | qemu_get_be16s(f, &vdev->queue_sel); | |
87b3bd1c | 1315 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { |
4b53c2c7 MR |
1316 | return -1; |
1317 | } | |
6d74ca5a | 1318 | qemu_get_be32s(f, &features); |
ad0c9332 | 1319 | |
a890a2f9 | 1320 | config_len = qemu_get_be32(f); |
2f5732e9 DDAG |
1321 | |
1322 | /* | |
1323 | * There are cases where the incoming config can be bigger or smaller | |
1324 | * than what we have; so load what we have space for, and skip | |
1325 | * any excess that's in the stream. | |
1326 | */ | |
1327 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); | |
1328 | ||
1329 | while (config_len > vdev->config_len) { | |
1330 | qemu_get_byte(f); | |
1331 | config_len--; | |
a890a2f9 | 1332 | } |
967f97fa AL |
1333 | |
1334 | num = qemu_get_be32(f); | |
1335 | ||
87b3bd1c | 1336 | if (num > VIRTIO_QUEUE_MAX) { |
cc459952 MT |
1337 | error_report("Invalid number of PCI queues: 0x%x", num); |
1338 | return -1; | |
1339 | } | |
1340 | ||
967f97fa AL |
1341 | for (i = 0; i < num; i++) { |
1342 | vdev->vq[i].vring.num = qemu_get_be32(f); | |
6ce69d1c PM |
1343 | if (k->has_variable_vring_alignment) { |
1344 | vdev->vq[i].vring.align = qemu_get_be32(f); | |
1345 | } | |
ab223c95 | 1346 | vdev->vq[i].vring.desc = qemu_get_be64(f); |
967f97fa | 1347 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
bcbabae8 MT |
1348 | vdev->vq[i].signalled_used_valid = false; |
1349 | vdev->vq[i].notification = true; | |
967f97fa | 1350 | |
ab223c95 CH |
1351 | if (vdev->vq[i].vring.desc) { |
1352 | /* XXX virtio-1 devices */ | |
1353 | virtio_queue_update_rings(vdev, i); | |
1abeb5a6 MT |
1354 | } else if (vdev->vq[i].last_avail_idx) { |
1355 | error_report("VQ %d address 0x0 " | |
6daf194d | 1356 | "inconsistent with Host index 0x%x", |
1abeb5a6 MT |
1357 | i, vdev->vq[i].last_avail_idx); |
1358 | return -1; | |
258dc7c9 | 1359 | } |
1c819449 FK |
1360 | if (k->load_queue) { |
1361 | ret = k->load_queue(qbus->parent, i, f); | |
ff24bd58 MT |
1362 | if (ret) |
1363 | return ret; | |
7055e687 | 1364 | } |
967f97fa AL |
1365 | } |
1366 | ||
7055e687 | 1367 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
1b5fc0de GK |
1368 | |
1369 | if (vdc->load != NULL) { | |
6b321a3d GK |
1370 | ret = vdc->load(vdev, f, version_id); |
1371 | if (ret) { | |
1372 | return ret; | |
1373 | } | |
1b5fc0de GK |
1374 | } |
1375 | ||
616a6552 GK |
1376 | /* Subsections */ |
1377 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); | |
1378 | if (ret) { | |
1379 | return ret; | |
1380 | } | |
1381 | ||
1382 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { | |
1383 | vdev->device_endian = virtio_default_endian(); | |
1384 | } | |
1385 | ||
019a3edb GH |
1386 | if (virtio_64bit_features_needed(vdev)) { |
1387 | /* | |
1388 | * Subsection load filled vdev->guest_features. Run them | |
1389 | * through virtio_set_features to sanity-check them against | |
1390 | * host_features. | |
1391 | */ | |
1392 | uint64_t features64 = vdev->guest_features; | |
6c0196d7 | 1393 | if (virtio_set_features_nocheck(vdev, features64) < 0) { |
019a3edb GH |
1394 | error_report("Features 0x%" PRIx64 " unsupported. " |
1395 | "Allowed features: 0x%" PRIx64, | |
1396 | features64, vdev->host_features); | |
1397 | return -1; | |
1398 | } | |
1399 | } else { | |
6c0196d7 | 1400 | if (virtio_set_features_nocheck(vdev, features) < 0) { |
019a3edb GH |
1401 | error_report("Features 0x%x unsupported. " |
1402 | "Allowed features: 0x%" PRIx64, | |
1403 | features, vdev->host_features); | |
1404 | return -1; | |
1405 | } | |
1406 | } | |
1407 | ||
616a6552 | 1408 | for (i = 0; i < num; i++) { |
ab223c95 | 1409 | if (vdev->vq[i].vring.desc) { |
616a6552 GK |
1410 | uint16_t nheads; |
1411 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; | |
1412 | /* Check it isn't doing strange things with descriptor numbers. */ | |
1413 | if (nheads > vdev->vq[i].vring.num) { | |
1414 | error_report("VQ %d size 0x%x Guest index 0x%x " | |
1415 | "inconsistent with Host index 0x%x: delta 0x%x", | |
1416 | i, vdev->vq[i].vring.num, | |
1417 | vring_avail_idx(&vdev->vq[i]), | |
1418 | vdev->vq[i].last_avail_idx, nheads); | |
1419 | return -1; | |
1420 | } | |
1421 | } | |
1422 | } | |
1423 | ||
1424 | return 0; | |
967f97fa AL |
1425 | } |
1426 | ||
6a1a8cc7 | 1427 | void virtio_cleanup(VirtIODevice *vdev) |
b946a153 | 1428 | { |
85cf2a8d | 1429 | qemu_del_vm_change_state_handler(vdev->vmstate); |
6f79e06b | 1430 | g_free(vdev->config); |
7267c094 | 1431 | g_free(vdev->vq); |
e0d686bf | 1432 | g_free(vdev->vector_queues); |
8e05db92 FK |
1433 | } |
1434 | ||
1dfb4dd9 | 1435 | static void virtio_vmstate_change(void *opaque, int running, RunState state) |
85cf2a8d MT |
1436 | { |
1437 | VirtIODevice *vdev = opaque; | |
1c819449 FK |
1438 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1439 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
85cf2a8d | 1440 | bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK); |
9e8e8c48 | 1441 | vdev->vm_running = running; |
85cf2a8d MT |
1442 | |
1443 | if (backend_run) { | |
1444 | virtio_set_status(vdev, vdev->status); | |
1445 | } | |
1446 | ||
1c819449 FK |
1447 | if (k->vmstate_change) { |
1448 | k->vmstate_change(qbus->parent, backend_run); | |
85cf2a8d MT |
1449 | } |
1450 | ||
1451 | if (!backend_run) { | |
1452 | virtio_set_status(vdev, vdev->status); | |
1453 | } | |
1454 | } | |
1455 | ||
c8075caf GA |
1456 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
1457 | size_t vdev_size, const char *vdev_name) | |
1458 | { | |
1459 | DeviceState *vdev = data; | |
1460 | ||
1461 | object_initialize(vdev, vdev_size, vdev_name); | |
1462 | object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL); | |
1463 | object_unref(OBJECT(vdev)); | |
1464 | qdev_alias_all_properties(vdev, proxy_obj); | |
1465 | } | |
1466 | ||
8e05db92 FK |
1467 | void virtio_init(VirtIODevice *vdev, const char *name, |
1468 | uint16_t device_id, size_t config_size) | |
967f97fa | 1469 | { |
e0d686bf JW |
1470 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1471 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
b8193adb | 1472 | int i; |
e0d686bf JW |
1473 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; |
1474 | ||
1475 | if (nvectors) { | |
1476 | vdev->vector_queues = | |
1477 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); | |
1478 | } | |
1479 | ||
53c25cea | 1480 | vdev->device_id = device_id; |
967f97fa AL |
1481 | vdev->status = 0; |
1482 | vdev->isr = 0; | |
1483 | vdev->queue_sel = 0; | |
7055e687 | 1484 | vdev->config_vector = VIRTIO_NO_VECTOR; |
87b3bd1c | 1485 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); |
1354869c | 1486 | vdev->vm_running = runstate_is_running(); |
87b3bd1c | 1487 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
b8193adb | 1488 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
1cbdabe2 | 1489 | vdev->vq[i].vdev = vdev; |
e78a2b42 | 1490 | vdev->vq[i].queue_index = i; |
1cbdabe2 | 1491 | } |
967f97fa | 1492 | |
967f97fa AL |
1493 | vdev->name = name; |
1494 | vdev->config_len = config_size; | |
8e05db92 | 1495 | if (vdev->config_len) { |
7267c094 | 1496 | vdev->config = g_malloc0(config_size); |
8e05db92 | 1497 | } else { |
967f97fa | 1498 | vdev->config = NULL; |
8e05db92 FK |
1499 | } |
1500 | vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, | |
1501 | vdev); | |
616a6552 | 1502 | vdev->device_endian = virtio_default_endian(); |
8e05db92 | 1503 | } |
967f97fa | 1504 | |
a8170e5e | 1505 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1506 | { |
1507 | return vdev->vq[n].vring.desc; | |
1508 | } | |
1509 | ||
a8170e5e | 1510 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1511 | { |
1512 | return vdev->vq[n].vring.avail; | |
1513 | } | |
1514 | ||
a8170e5e | 1515 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1516 | { |
1517 | return vdev->vq[n].vring.used; | |
1518 | } | |
1519 | ||
a8170e5e | 1520 | hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1521 | { |
1522 | return vdev->vq[n].vring.desc; | |
1523 | } | |
1524 | ||
a8170e5e | 1525 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1526 | { |
1527 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; | |
1528 | } | |
1529 | ||
a8170e5e | 1530 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1531 | { |
1532 | return offsetof(VRingAvail, ring) + | |
50764fc8 | 1533 | sizeof(uint16_t) * vdev->vq[n].vring.num; |
1cbdabe2 MT |
1534 | } |
1535 | ||
a8170e5e | 1536 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1537 | { |
1538 | return offsetof(VRingUsed, ring) + | |
1539 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num; | |
1540 | } | |
1541 | ||
a8170e5e | 1542 | hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1543 | { |
1544 | return vdev->vq[n].vring.used - vdev->vq[n].vring.desc + | |
1545 | virtio_queue_get_used_size(vdev, n); | |
1546 | } | |
1547 | ||
1548 | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) | |
1549 | { | |
1550 | return vdev->vq[n].last_avail_idx; | |
1551 | } | |
1552 | ||
1553 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) | |
1554 | { | |
1555 | vdev->vq[n].last_avail_idx = idx; | |
1556 | } | |
1557 | ||
6793dfd1 SH |
1558 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) |
1559 | { | |
1560 | vdev->vq[n].signalled_used_valid = false; | |
1561 | } | |
1562 | ||
1cbdabe2 MT |
1563 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) |
1564 | { | |
1565 | return vdev->vq + n; | |
1566 | } | |
1567 | ||
e78a2b42 JW |
1568 | uint16_t virtio_get_queue_index(VirtQueue *vq) |
1569 | { | |
1570 | return vq->queue_index; | |
1571 | } | |
1572 | ||
15b2bd18 PB |
1573 | static void virtio_queue_guest_notifier_read(EventNotifier *n) |
1574 | { | |
1575 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); | |
1576 | if (event_notifier_test_and_clear(n)) { | |
1577 | virtio_irq(vq); | |
1578 | } | |
1579 | } | |
1580 | ||
1581 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, | |
1582 | bool with_irqfd) | |
1583 | { | |
1584 | if (assign && !with_irqfd) { | |
1585 | event_notifier_set_handler(&vq->guest_notifier, | |
1586 | virtio_queue_guest_notifier_read); | |
1587 | } else { | |
1588 | event_notifier_set_handler(&vq->guest_notifier, NULL); | |
1589 | } | |
1590 | if (!assign) { | |
1591 | /* Test and clear notifier before closing it, | |
1592 | * in case poll callback didn't have time to run. */ | |
1593 | virtio_queue_guest_notifier_read(&vq->guest_notifier); | |
1594 | } | |
1595 | } | |
1596 | ||
1cbdabe2 MT |
1597 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
1598 | { | |
1599 | return &vq->guest_notifier; | |
1600 | } | |
b1f416aa PB |
1601 | |
1602 | static void virtio_queue_host_notifier_read(EventNotifier *n) | |
1603 | { | |
1604 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
1605 | if (event_notifier_test_and_clear(n)) { | |
1606 | virtio_queue_notify_vq(vq); | |
1607 | } | |
1608 | } | |
1609 | ||
26b9b5fe PB |
1610 | void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, |
1611 | bool set_handler) | |
b1f416aa | 1612 | { |
26b9b5fe | 1613 | if (assign && set_handler) { |
b1f416aa PB |
1614 | event_notifier_set_handler(&vq->host_notifier, |
1615 | virtio_queue_host_notifier_read); | |
1616 | } else { | |
1617 | event_notifier_set_handler(&vq->host_notifier, NULL); | |
26b9b5fe PB |
1618 | } |
1619 | if (!assign) { | |
b1f416aa PB |
1620 | /* Test and clear notifier before after disabling event, |
1621 | * in case poll callback didn't have time to run. */ | |
1622 | virtio_queue_host_notifier_read(&vq->host_notifier); | |
1623 | } | |
1624 | } | |
1625 | ||
1cbdabe2 MT |
1626 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
1627 | { | |
1628 | return &vq->host_notifier; | |
1629 | } | |
8e05db92 | 1630 | |
1034e9cf FK |
1631 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) |
1632 | { | |
9e288406 | 1633 | g_free(vdev->bus_name); |
80e0090a | 1634 | vdev->bus_name = g_strdup(bus_name); |
1034e9cf FK |
1635 | } |
1636 | ||
1d244b42 AF |
1637 | static void virtio_device_realize(DeviceState *dev, Error **errp) |
1638 | { | |
1639 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
1640 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
1641 | Error *err = NULL; | |
1642 | ||
1d244b42 AF |
1643 | if (vdc->realize != NULL) { |
1644 | vdc->realize(dev, &err); | |
1645 | if (err != NULL) { | |
1646 | error_propagate(errp, err); | |
1647 | return; | |
1648 | } | |
8e05db92 | 1649 | } |
e8398045 JW |
1650 | |
1651 | virtio_bus_device_plugged(vdev, &err); | |
1652 | if (err != NULL) { | |
1653 | error_propagate(errp, err); | |
1654 | return; | |
1655 | } | |
8e05db92 FK |
1656 | } |
1657 | ||
1d244b42 | 1658 | static void virtio_device_unrealize(DeviceState *dev, Error **errp) |
1034e9cf | 1659 | { |
1d244b42 | 1660 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
306ec6c3 AF |
1661 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
1662 | Error *err = NULL; | |
1d244b42 | 1663 | |
83d07047 PB |
1664 | virtio_bus_device_unplugged(vdev); |
1665 | ||
306ec6c3 AF |
1666 | if (vdc->unrealize != NULL) { |
1667 | vdc->unrealize(dev, &err); | |
1668 | if (err != NULL) { | |
1669 | error_propagate(errp, err); | |
1670 | return; | |
1671 | } | |
5e96f5d2 | 1672 | } |
1d244b42 | 1673 | |
9e288406 MA |
1674 | g_free(vdev->bus_name); |
1675 | vdev->bus_name = NULL; | |
1034e9cf FK |
1676 | } |
1677 | ||
6b8f1020 CH |
1678 | static Property virtio_properties[] = { |
1679 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), | |
1680 | DEFINE_PROP_END_OF_LIST(), | |
1681 | }; | |
1682 | ||
8e05db92 FK |
1683 | static void virtio_device_class_init(ObjectClass *klass, void *data) |
1684 | { | |
1685 | /* Set the default value here. */ | |
1686 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1d244b42 AF |
1687 | |
1688 | dc->realize = virtio_device_realize; | |
1689 | dc->unrealize = virtio_device_unrealize; | |
8e05db92 | 1690 | dc->bus_type = TYPE_VIRTIO_BUS; |
6b8f1020 | 1691 | dc->props = virtio_properties; |
8e05db92 FK |
1692 | } |
1693 | ||
1694 | static const TypeInfo virtio_device_info = { | |
1695 | .name = TYPE_VIRTIO_DEVICE, | |
1696 | .parent = TYPE_DEVICE, | |
1697 | .instance_size = sizeof(VirtIODevice), | |
1698 | .class_init = virtio_device_class_init, | |
1699 | .abstract = true, | |
1700 | .class_size = sizeof(VirtioDeviceClass), | |
1701 | }; | |
1702 | ||
1703 | static void virtio_register_types(void) | |
1704 | { | |
1705 | type_register_static(&virtio_device_info); | |
1706 | } | |
1707 | ||
1708 | type_init(virtio_register_types) |