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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; | |
6ce69d1c | 63 | unsigned int align; |
a8170e5e AK |
64 | hwaddr desc; |
65 | hwaddr avail; | |
66 | hwaddr used; | |
967f97fa AL |
67 | } VRing; |
68 | ||
69 | struct VirtQueue | |
70 | { | |
71 | VRing vring; | |
967f97fa | 72 | uint16_t last_avail_idx; |
bcbabae8 MT |
73 | /* Last used index value we have signalled on */ |
74 | uint16_t signalled_used; | |
75 | ||
76 | /* Last used index value we have signalled on */ | |
77 | bool signalled_used_valid; | |
78 | ||
79 | /* Notification enabled? */ | |
80 | bool notification; | |
81 | ||
e78a2b42 JW |
82 | uint16_t queue_index; |
83 | ||
967f97fa | 84 | int inuse; |
bcbabae8 | 85 | |
7055e687 | 86 | uint16_t vector; |
967f97fa | 87 | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq); |
1cbdabe2 MT |
88 | VirtIODevice *vdev; |
89 | EventNotifier guest_notifier; | |
90 | EventNotifier host_notifier; | |
e0d686bf | 91 | QLIST_ENTRY(VirtQueue) node; |
967f97fa AL |
92 | }; |
93 | ||
967f97fa | 94 | /* virt queue functions */ |
ab223c95 | 95 | void virtio_queue_update_rings(VirtIODevice *vdev, int n) |
967f97fa | 96 | { |
ab223c95 | 97 | VRing *vring = &vdev->vq[n].vring; |
53c25cea | 98 | |
ab223c95 CH |
99 | if (!vring->desc) { |
100 | /* not yet setup -> nothing to do */ | |
101 | return; | |
102 | } | |
103 | vring->avail = vring->desc + vring->num * sizeof(VRingDesc); | |
104 | vring->used = vring_align(vring->avail + | |
105 | offsetof(VRingAvail, ring[vring->num]), | |
106 | vring->align); | |
967f97fa AL |
107 | } |
108 | ||
cee3ca00 RR |
109 | static inline uint64_t vring_desc_addr(VirtIODevice *vdev, hwaddr desc_pa, |
110 | int i) | |
967f97fa | 111 | { |
a8170e5e | 112 | hwaddr pa; |
5774cf98 | 113 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr); |
cee3ca00 | 114 | return virtio_ldq_phys(vdev, pa); |
967f97fa AL |
115 | } |
116 | ||
cee3ca00 | 117 | static inline uint32_t vring_desc_len(VirtIODevice *vdev, hwaddr desc_pa, int i) |
967f97fa | 118 | { |
a8170e5e | 119 | hwaddr pa; |
5774cf98 | 120 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len); |
cee3ca00 | 121 | return virtio_ldl_phys(vdev, pa); |
967f97fa AL |
122 | } |
123 | ||
cee3ca00 RR |
124 | static inline uint16_t vring_desc_flags(VirtIODevice *vdev, hwaddr desc_pa, |
125 | int i) | |
967f97fa | 126 | { |
a8170e5e | 127 | hwaddr pa; |
5774cf98 | 128 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags); |
cee3ca00 | 129 | return virtio_lduw_phys(vdev, pa); |
967f97fa AL |
130 | } |
131 | ||
cee3ca00 RR |
132 | static inline uint16_t vring_desc_next(VirtIODevice *vdev, hwaddr desc_pa, |
133 | int i) | |
967f97fa | 134 | { |
a8170e5e | 135 | hwaddr pa; |
5774cf98 | 136 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next); |
cee3ca00 | 137 | return virtio_lduw_phys(vdev, pa); |
967f97fa AL |
138 | } |
139 | ||
140 | static inline uint16_t vring_avail_flags(VirtQueue *vq) | |
141 | { | |
a8170e5e | 142 | hwaddr pa; |
967f97fa | 143 | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
cee3ca00 | 144 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
145 | } |
146 | ||
147 | static inline uint16_t vring_avail_idx(VirtQueue *vq) | |
148 | { | |
a8170e5e | 149 | hwaddr pa; |
967f97fa | 150 | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
cee3ca00 | 151 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
152 | } |
153 | ||
154 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) | |
155 | { | |
a8170e5e | 156 | hwaddr pa; |
967f97fa | 157 | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
cee3ca00 | 158 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
159 | } |
160 | ||
e9600c6c | 161 | static inline uint16_t vring_get_used_event(VirtQueue *vq) |
bcbabae8 MT |
162 | { |
163 | return vring_avail_ring(vq, vq->vring.num); | |
164 | } | |
165 | ||
967f97fa AL |
166 | static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
167 | { | |
a8170e5e | 168 | hwaddr pa; |
967f97fa | 169 | pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
cee3ca00 | 170 | virtio_stl_phys(vq->vdev, pa, val); |
967f97fa AL |
171 | } |
172 | ||
173 | static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) | |
174 | { | |
a8170e5e | 175 | hwaddr pa; |
967f97fa | 176 | pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
cee3ca00 | 177 | virtio_stl_phys(vq->vdev, pa, val); |
967f97fa AL |
178 | } |
179 | ||
180 | static uint16_t vring_used_idx(VirtQueue *vq) | |
181 | { | |
a8170e5e | 182 | hwaddr pa; |
967f97fa | 183 | pa = vq->vring.used + offsetof(VRingUsed, idx); |
cee3ca00 | 184 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
185 | } |
186 | ||
bcbabae8 | 187 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
967f97fa | 188 | { |
a8170e5e | 189 | hwaddr pa; |
967f97fa | 190 | pa = vq->vring.used + offsetof(VRingUsed, idx); |
cee3ca00 | 191 | virtio_stw_phys(vq->vdev, pa, val); |
967f97fa AL |
192 | } |
193 | ||
194 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) | |
195 | { | |
cee3ca00 | 196 | VirtIODevice *vdev = vq->vdev; |
a8170e5e | 197 | hwaddr pa; |
967f97fa | 198 | pa = vq->vring.used + offsetof(VRingUsed, flags); |
cee3ca00 | 199 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) | mask); |
967f97fa AL |
200 | } |
201 | ||
202 | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) | |
203 | { | |
cee3ca00 | 204 | VirtIODevice *vdev = vq->vdev; |
a8170e5e | 205 | hwaddr pa; |
967f97fa | 206 | pa = vq->vring.used + offsetof(VRingUsed, flags); |
cee3ca00 | 207 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) & ~mask); |
967f97fa AL |
208 | } |
209 | ||
e9600c6c | 210 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) |
bcbabae8 | 211 | { |
a8170e5e | 212 | hwaddr pa; |
bcbabae8 MT |
213 | if (!vq->notification) { |
214 | return; | |
215 | } | |
216 | pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]); | |
cee3ca00 | 217 | virtio_stw_phys(vq->vdev, pa, val); |
bcbabae8 MT |
218 | } |
219 | ||
967f97fa AL |
220 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
221 | { | |
bcbabae8 | 222 | vq->notification = enable; |
ef546f12 | 223 | if (virtio_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 224 | vring_set_avail_event(vq, vring_avail_idx(vq)); |
bcbabae8 | 225 | } else if (enable) { |
967f97fa | 226 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 227 | } else { |
967f97fa | 228 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 229 | } |
92045d80 MT |
230 | if (enable) { |
231 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
232 | smp_mb(); | |
233 | } | |
967f97fa AL |
234 | } |
235 | ||
236 | int virtio_queue_ready(VirtQueue *vq) | |
237 | { | |
238 | return vq->vring.avail != 0; | |
239 | } | |
240 | ||
241 | int virtio_queue_empty(VirtQueue *vq) | |
242 | { | |
243 | return vring_avail_idx(vq) == vq->last_avail_idx; | |
244 | } | |
245 | ||
246 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, | |
247 | unsigned int len, unsigned int idx) | |
248 | { | |
249 | unsigned int offset; | |
250 | int i; | |
251 | ||
64979a4d SH |
252 | trace_virtqueue_fill(vq, elem, len, idx); |
253 | ||
967f97fa AL |
254 | offset = 0; |
255 | for (i = 0; i < elem->in_num; i++) { | |
256 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); | |
257 | ||
26b258e1 AL |
258 | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
259 | elem->in_sg[i].iov_len, | |
260 | 1, size); | |
967f97fa | 261 | |
0cea71a2 | 262 | offset += size; |
967f97fa AL |
263 | } |
264 | ||
26b258e1 AL |
265 | for (i = 0; i < elem->out_num; i++) |
266 | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, | |
267 | elem->out_sg[i].iov_len, | |
268 | 0, elem->out_sg[i].iov_len); | |
269 | ||
967f97fa AL |
270 | idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
271 | ||
272 | /* Get a pointer to the next entry in the used ring. */ | |
273 | vring_used_ring_id(vq, idx, elem->index); | |
274 | vring_used_ring_len(vq, idx, len); | |
275 | } | |
276 | ||
277 | void virtqueue_flush(VirtQueue *vq, unsigned int count) | |
278 | { | |
bcbabae8 | 279 | uint16_t old, new; |
967f97fa | 280 | /* Make sure buffer is written before we update index. */ |
b90d2f35 | 281 | smp_wmb(); |
64979a4d | 282 | trace_virtqueue_flush(vq, count); |
bcbabae8 MT |
283 | old = vring_used_idx(vq); |
284 | new = old + count; | |
285 | vring_used_idx_set(vq, new); | |
967f97fa | 286 | vq->inuse -= count; |
bcbabae8 MT |
287 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) |
288 | vq->signalled_used_valid = false; | |
967f97fa AL |
289 | } |
290 | ||
291 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, | |
292 | unsigned int len) | |
293 | { | |
294 | virtqueue_fill(vq, elem, len, 0); | |
295 | virtqueue_flush(vq, 1); | |
296 | } | |
297 | ||
298 | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) | |
299 | { | |
300 | uint16_t num_heads = vring_avail_idx(vq) - idx; | |
301 | ||
302 | /* Check it isn't doing very strange things with descriptor numbers. */ | |
bb6834cf | 303 | if (num_heads > vq->vring.num) { |
ce67ed65 SH |
304 | error_report("Guest moved used index from %u to %u", |
305 | idx, vring_avail_idx(vq)); | |
bb6834cf AL |
306 | exit(1); |
307 | } | |
a821ce59 MT |
308 | /* On success, callers read a descriptor at vq->last_avail_idx. |
309 | * Make sure descriptor read does not bypass avail index read. */ | |
310 | if (num_heads) { | |
311 | smp_rmb(); | |
312 | } | |
967f97fa AL |
313 | |
314 | return num_heads; | |
315 | } | |
316 | ||
317 | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) | |
318 | { | |
319 | unsigned int head; | |
320 | ||
321 | /* Grab the next descriptor number they're advertising, and increment | |
322 | * the index we've seen. */ | |
323 | head = vring_avail_ring(vq, idx % vq->vring.num); | |
324 | ||
325 | /* If their number is silly, that's a fatal mistake. */ | |
bb6834cf | 326 | if (head >= vq->vring.num) { |
ce67ed65 | 327 | error_report("Guest says index %u is available", head); |
bb6834cf AL |
328 | exit(1); |
329 | } | |
967f97fa AL |
330 | |
331 | return head; | |
332 | } | |
333 | ||
cee3ca00 | 334 | static unsigned virtqueue_next_desc(VirtIODevice *vdev, hwaddr desc_pa, |
5774cf98 | 335 | unsigned int i, unsigned int max) |
967f97fa AL |
336 | { |
337 | unsigned int next; | |
338 | ||
339 | /* If this descriptor says it doesn't chain, we're done. */ | |
cee3ca00 | 340 | if (!(vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_NEXT)) { |
5774cf98 | 341 | return max; |
cee3ca00 | 342 | } |
967f97fa AL |
343 | |
344 | /* Check they're not leading us off end of descriptors. */ | |
cee3ca00 | 345 | next = vring_desc_next(vdev, desc_pa, i); |
967f97fa | 346 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
b90d2f35 | 347 | smp_wmb(); |
967f97fa | 348 | |
5774cf98 | 349 | if (next >= max) { |
ce67ed65 | 350 | error_report("Desc next is %u", next); |
bb6834cf AL |
351 | exit(1); |
352 | } | |
967f97fa AL |
353 | |
354 | return next; | |
355 | } | |
356 | ||
0d8d7690 | 357 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, |
e1f7b481 MT |
358 | unsigned int *out_bytes, |
359 | unsigned max_in_bytes, unsigned max_out_bytes) | |
967f97fa | 360 | { |
efeea6d0 | 361 | unsigned int idx; |
385ce95d | 362 | unsigned int total_bufs, in_total, out_total; |
967f97fa AL |
363 | |
364 | idx = vq->last_avail_idx; | |
365 | ||
efeea6d0 | 366 | total_bufs = in_total = out_total = 0; |
967f97fa | 367 | while (virtqueue_num_heads(vq, idx)) { |
cee3ca00 | 368 | VirtIODevice *vdev = vq->vdev; |
efeea6d0 | 369 | unsigned int max, num_bufs, indirect = 0; |
a8170e5e | 370 | hwaddr desc_pa; |
967f97fa AL |
371 | int i; |
372 | ||
efeea6d0 MM |
373 | max = vq->vring.num; |
374 | num_bufs = total_bufs; | |
967f97fa | 375 | i = virtqueue_get_head(vq, idx++); |
efeea6d0 MM |
376 | desc_pa = vq->vring.desc; |
377 | ||
cee3ca00 RR |
378 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) { |
379 | if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) { | |
ce67ed65 | 380 | error_report("Invalid size for indirect buffer table"); |
efeea6d0 MM |
381 | exit(1); |
382 | } | |
383 | ||
384 | /* If we've got too many, that implies a descriptor loop. */ | |
385 | if (num_bufs >= max) { | |
ce67ed65 | 386 | error_report("Looped descriptor"); |
efeea6d0 MM |
387 | exit(1); |
388 | } | |
389 | ||
390 | /* loop over the indirect descriptor table */ | |
391 | indirect = 1; | |
cee3ca00 RR |
392 | max = vring_desc_len(vdev, desc_pa, i) / sizeof(VRingDesc); |
393 | desc_pa = vring_desc_addr(vdev, desc_pa, i); | |
1ae2757c | 394 | num_bufs = i = 0; |
efeea6d0 MM |
395 | } |
396 | ||
967f97fa AL |
397 | do { |
398 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 399 | if (++num_bufs > max) { |
ce67ed65 | 400 | error_report("Looped descriptor"); |
bb6834cf AL |
401 | exit(1); |
402 | } | |
967f97fa | 403 | |
cee3ca00 RR |
404 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_WRITE) { |
405 | in_total += vring_desc_len(vdev, desc_pa, i); | |
967f97fa | 406 | } else { |
cee3ca00 | 407 | out_total += vring_desc_len(vdev, desc_pa, i); |
967f97fa | 408 | } |
e1f7b481 MT |
409 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
410 | goto done; | |
411 | } | |
cee3ca00 | 412 | } while ((i = virtqueue_next_desc(vdev, desc_pa, i, max)) != max); |
efeea6d0 MM |
413 | |
414 | if (!indirect) | |
415 | total_bufs = num_bufs; | |
416 | else | |
417 | total_bufs++; | |
967f97fa | 418 | } |
e1f7b481 | 419 | done: |
0d8d7690 AS |
420 | if (in_bytes) { |
421 | *in_bytes = in_total; | |
422 | } | |
423 | if (out_bytes) { | |
424 | *out_bytes = out_total; | |
425 | } | |
426 | } | |
967f97fa | 427 | |
0d8d7690 AS |
428 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
429 | unsigned int out_bytes) | |
430 | { | |
431 | unsigned int in_total, out_total; | |
432 | ||
e1f7b481 MT |
433 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); |
434 | return in_bytes <= in_total && out_bytes <= out_total; | |
967f97fa AL |
435 | } |
436 | ||
a8170e5e | 437 | void virtqueue_map_sg(struct iovec *sg, hwaddr *addr, |
42fb2e07 KW |
438 | size_t num_sg, int is_write) |
439 | { | |
440 | unsigned int i; | |
a8170e5e | 441 | hwaddr len; |
42fb2e07 | 442 | |
93725140 | 443 | if (num_sg > VIRTQUEUE_MAX_SIZE) { |
36cf2a37 MT |
444 | error_report("virtio: map attempt out of bounds: %zd > %d", |
445 | num_sg, VIRTQUEUE_MAX_SIZE); | |
446 | exit(1); | |
447 | } | |
448 | ||
42fb2e07 KW |
449 | for (i = 0; i < num_sg; i++) { |
450 | len = sg[i].iov_len; | |
451 | sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); | |
452 | if (sg[i].iov_base == NULL || len != sg[i].iov_len) { | |
1a285899 | 453 | error_report("virtio: error trying to map MMIO memory"); |
42fb2e07 KW |
454 | exit(1); |
455 | } | |
456 | } | |
457 | } | |
458 | ||
967f97fa AL |
459 | int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem) |
460 | { | |
5774cf98 | 461 | unsigned int i, head, max; |
a8170e5e | 462 | hwaddr desc_pa = vq->vring.desc; |
cee3ca00 | 463 | VirtIODevice *vdev = vq->vdev; |
967f97fa AL |
464 | |
465 | if (!virtqueue_num_heads(vq, vq->last_avail_idx)) | |
466 | return 0; | |
467 | ||
468 | /* When we start there are none of either input nor output. */ | |
469 | elem->out_num = elem->in_num = 0; | |
470 | ||
5774cf98 MM |
471 | max = vq->vring.num; |
472 | ||
967f97fa | 473 | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
ef546f12 | 474 | if (virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 475 | vring_set_avail_event(vq, vq->last_avail_idx); |
bcbabae8 | 476 | } |
efeea6d0 | 477 | |
cee3ca00 RR |
478 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) { |
479 | if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) { | |
ce67ed65 | 480 | error_report("Invalid size for indirect buffer table"); |
efeea6d0 MM |
481 | exit(1); |
482 | } | |
483 | ||
484 | /* loop over the indirect descriptor table */ | |
cee3ca00 RR |
485 | max = vring_desc_len(vdev, desc_pa, i) / sizeof(VRingDesc); |
486 | desc_pa = vring_desc_addr(vdev, desc_pa, i); | |
efeea6d0 MM |
487 | i = 0; |
488 | } | |
489 | ||
42fb2e07 | 490 | /* Collect all the descriptors */ |
967f97fa AL |
491 | do { |
492 | struct iovec *sg; | |
493 | ||
cee3ca00 | 494 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_WRITE) { |
c8eac1cf MT |
495 | if (elem->in_num >= ARRAY_SIZE(elem->in_sg)) { |
496 | error_report("Too many write descriptors in indirect table"); | |
497 | exit(1); | |
498 | } | |
cee3ca00 | 499 | elem->in_addr[elem->in_num] = vring_desc_addr(vdev, desc_pa, i); |
967f97fa | 500 | sg = &elem->in_sg[elem->in_num++]; |
42fb2e07 | 501 | } else { |
c8eac1cf MT |
502 | if (elem->out_num >= ARRAY_SIZE(elem->out_sg)) { |
503 | error_report("Too many read descriptors in indirect table"); | |
504 | exit(1); | |
505 | } | |
cee3ca00 | 506 | elem->out_addr[elem->out_num] = vring_desc_addr(vdev, desc_pa, i); |
967f97fa | 507 | sg = &elem->out_sg[elem->out_num++]; |
42fb2e07 | 508 | } |
967f97fa | 509 | |
cee3ca00 | 510 | sg->iov_len = vring_desc_len(vdev, desc_pa, i); |
967f97fa AL |
511 | |
512 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 513 | if ((elem->in_num + elem->out_num) > max) { |
ce67ed65 | 514 | error_report("Looped descriptor"); |
bb6834cf AL |
515 | exit(1); |
516 | } | |
cee3ca00 | 517 | } while ((i = virtqueue_next_desc(vdev, desc_pa, i, max)) != max); |
967f97fa | 518 | |
42fb2e07 KW |
519 | /* Now map what we have collected */ |
520 | virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1); | |
521 | virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0); | |
522 | ||
967f97fa AL |
523 | elem->index = head; |
524 | ||
525 | vq->inuse++; | |
526 | ||
64979a4d | 527 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
967f97fa AL |
528 | return elem->in_num + elem->out_num; |
529 | } | |
530 | ||
531 | /* virtio device */ | |
7055e687 MT |
532 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
533 | { | |
1c819449 FK |
534 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
535 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
536 | ||
537 | if (k->notify) { | |
538 | k->notify(qbus->parent, vector); | |
7055e687 MT |
539 | } |
540 | } | |
967f97fa | 541 | |
53c25cea | 542 | void virtio_update_irq(VirtIODevice *vdev) |
967f97fa | 543 | { |
7055e687 | 544 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
967f97fa AL |
545 | } |
546 | ||
0b352fd6 CH |
547 | static int virtio_validate_features(VirtIODevice *vdev) |
548 | { | |
549 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
550 | ||
551 | if (k->validate_features) { | |
552 | return k->validate_features(vdev); | |
553 | } else { | |
554 | return 0; | |
555 | } | |
556 | } | |
557 | ||
558 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) | |
4e1837f8 | 559 | { |
181103cd | 560 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
4e1837f8 SH |
561 | trace_virtio_set_status(vdev, val); |
562 | ||
0b352fd6 CH |
563 | if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
564 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && | |
565 | val & VIRTIO_CONFIG_S_FEATURES_OK) { | |
566 | int ret = virtio_validate_features(vdev); | |
567 | ||
568 | if (ret) { | |
569 | return ret; | |
570 | } | |
571 | } | |
572 | } | |
181103cd FK |
573 | if (k->set_status) { |
574 | k->set_status(vdev, val); | |
4e1837f8 SH |
575 | } |
576 | vdev->status = val; | |
0b352fd6 | 577 | return 0; |
4e1837f8 SH |
578 | } |
579 | ||
616a6552 GK |
580 | bool target_words_bigendian(void); |
581 | static enum virtio_device_endian virtio_default_endian(void) | |
582 | { | |
583 | if (target_words_bigendian()) { | |
584 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
585 | } else { | |
586 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
587 | } | |
588 | } | |
589 | ||
590 | static enum virtio_device_endian virtio_current_cpu_endian(void) | |
591 | { | |
592 | CPUClass *cc = CPU_GET_CLASS(current_cpu); | |
593 | ||
594 | if (cc->virtio_is_big_endian(current_cpu)) { | |
595 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
596 | } else { | |
597 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
598 | } | |
599 | } | |
600 | ||
53c25cea | 601 | void virtio_reset(void *opaque) |
967f97fa AL |
602 | { |
603 | VirtIODevice *vdev = opaque; | |
181103cd | 604 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
605 | int i; |
606 | ||
e0c472d8 | 607 | virtio_set_status(vdev, 0); |
616a6552 GK |
608 | if (current_cpu) { |
609 | /* Guest initiated reset */ | |
610 | vdev->device_endian = virtio_current_cpu_endian(); | |
611 | } else { | |
612 | /* System reset */ | |
613 | vdev->device_endian = virtio_default_endian(); | |
614 | } | |
e0c472d8 | 615 | |
181103cd FK |
616 | if (k->reset) { |
617 | k->reset(vdev); | |
618 | } | |
967f97fa | 619 | |
704a76fc | 620 | vdev->guest_features = 0; |
967f97fa AL |
621 | vdev->queue_sel = 0; |
622 | vdev->status = 0; | |
623 | vdev->isr = 0; | |
7055e687 MT |
624 | vdev->config_vector = VIRTIO_NO_VECTOR; |
625 | virtio_notify_vector(vdev, vdev->config_vector); | |
967f97fa | 626 | |
87b3bd1c | 627 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
628 | vdev->vq[i].vring.desc = 0; |
629 | vdev->vq[i].vring.avail = 0; | |
630 | vdev->vq[i].vring.used = 0; | |
631 | vdev->vq[i].last_avail_idx = 0; | |
e0d686bf | 632 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); |
bcbabae8 MT |
633 | vdev->vq[i].signalled_used = 0; |
634 | vdev->vq[i].signalled_used_valid = false; | |
635 | vdev->vq[i].notification = true; | |
967f97fa AL |
636 | } |
637 | } | |
638 | ||
53c25cea | 639 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 640 | { |
181103cd | 641 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
642 | uint8_t val; |
643 | ||
5f5a1318 | 644 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 645 | return (uint32_t)-1; |
5f5a1318 JW |
646 | } |
647 | ||
648 | k->get_config(vdev, vdev->config); | |
967f97fa | 649 | |
06dbfc6f | 650 | val = ldub_p(vdev->config + addr); |
967f97fa AL |
651 | return val; |
652 | } | |
653 | ||
53c25cea | 654 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 655 | { |
181103cd | 656 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
657 | uint16_t val; |
658 | ||
5f5a1318 | 659 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 660 | return (uint32_t)-1; |
5f5a1318 JW |
661 | } |
662 | ||
663 | k->get_config(vdev, vdev->config); | |
967f97fa | 664 | |
06dbfc6f | 665 | val = lduw_p(vdev->config + addr); |
967f97fa AL |
666 | return val; |
667 | } | |
668 | ||
53c25cea | 669 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 670 | { |
181103cd | 671 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
672 | uint32_t val; |
673 | ||
5f5a1318 | 674 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 675 | return (uint32_t)-1; |
5f5a1318 JW |
676 | } |
677 | ||
678 | k->get_config(vdev, vdev->config); | |
967f97fa | 679 | |
06dbfc6f | 680 | val = ldl_p(vdev->config + addr); |
967f97fa AL |
681 | return val; |
682 | } | |
683 | ||
53c25cea | 684 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 685 | { |
181103cd | 686 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
687 | uint8_t val = data; |
688 | ||
5f5a1318 | 689 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 690 | return; |
5f5a1318 | 691 | } |
967f97fa | 692 | |
06dbfc6f | 693 | stb_p(vdev->config + addr, val); |
967f97fa | 694 | |
181103cd FK |
695 | if (k->set_config) { |
696 | k->set_config(vdev, vdev->config); | |
697 | } | |
967f97fa AL |
698 | } |
699 | ||
53c25cea | 700 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 701 | { |
181103cd | 702 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
703 | uint16_t val = data; |
704 | ||
5f5a1318 | 705 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 706 | return; |
5f5a1318 | 707 | } |
967f97fa | 708 | |
06dbfc6f | 709 | stw_p(vdev->config + addr, val); |
967f97fa | 710 | |
181103cd FK |
711 | if (k->set_config) { |
712 | k->set_config(vdev, vdev->config); | |
713 | } | |
967f97fa AL |
714 | } |
715 | ||
53c25cea | 716 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 717 | { |
181103cd | 718 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
719 | uint32_t val = data; |
720 | ||
5f5a1318 | 721 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 722 | return; |
5f5a1318 | 723 | } |
967f97fa | 724 | |
06dbfc6f | 725 | stl_p(vdev->config + addr, val); |
967f97fa | 726 | |
181103cd FK |
727 | if (k->set_config) { |
728 | k->set_config(vdev, vdev->config); | |
729 | } | |
967f97fa AL |
730 | } |
731 | ||
a8170e5e | 732 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) |
967f97fa | 733 | { |
ab223c95 CH |
734 | vdev->vq[n].vring.desc = addr; |
735 | virtio_queue_update_rings(vdev, n); | |
53c25cea PB |
736 | } |
737 | ||
a8170e5e | 738 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) |
53c25cea | 739 | { |
ab223c95 CH |
740 | return vdev->vq[n].vring.desc; |
741 | } | |
742 | ||
743 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, | |
744 | hwaddr avail, hwaddr used) | |
745 | { | |
746 | vdev->vq[n].vring.desc = desc; | |
747 | vdev->vq[n].vring.avail = avail; | |
748 | vdev->vq[n].vring.used = used; | |
53c25cea PB |
749 | } |
750 | ||
e63c0ba1 PM |
751 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) |
752 | { | |
f6049f44 PM |
753 | /* Don't allow guest to flip queue between existent and |
754 | * nonexistent states, or to set it to an invalid size. | |
755 | */ | |
756 | if (!!num != !!vdev->vq[n].vring.num || | |
757 | num > VIRTQUEUE_MAX_SIZE || | |
758 | num < 0) { | |
759 | return; | |
e63c0ba1 | 760 | } |
f6049f44 | 761 | vdev->vq[n].vring.num = num; |
e63c0ba1 PM |
762 | } |
763 | ||
e0d686bf JW |
764 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) |
765 | { | |
766 | return QLIST_FIRST(&vdev->vector_queues[vector]); | |
767 | } | |
768 | ||
769 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) | |
770 | { | |
771 | return QLIST_NEXT(vq, node); | |
772 | } | |
773 | ||
53c25cea PB |
774 | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
775 | { | |
776 | return vdev->vq[n].vring.num; | |
777 | } | |
967f97fa | 778 | |
8ad176aa JW |
779 | int virtio_get_num_queues(VirtIODevice *vdev) |
780 | { | |
781 | int i; | |
782 | ||
87b3bd1c | 783 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
8ad176aa JW |
784 | if (!virtio_queue_get_num(vdev, i)) { |
785 | break; | |
786 | } | |
787 | } | |
788 | ||
789 | return i; | |
790 | } | |
791 | ||
c80decdb PB |
792 | int virtio_queue_get_id(VirtQueue *vq) |
793 | { | |
794 | VirtIODevice *vdev = vq->vdev; | |
87b3bd1c | 795 | assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_QUEUE_MAX]); |
c80decdb PB |
796 | return vq - &vdev->vq[0]; |
797 | } | |
798 | ||
6ce69d1c PM |
799 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) |
800 | { | |
801 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
802 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
803 | ||
ab223c95 CH |
804 | /* virtio-1 compliant devices cannot change the alignment */ |
805 | if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
806 | error_report("tried to modify queue alignment for virtio-1 device"); | |
807 | return; | |
808 | } | |
6ce69d1c PM |
809 | /* Check that the transport told us it was going to do this |
810 | * (so a buggy transport will immediately assert rather than | |
811 | * silently failing to migrate this state) | |
812 | */ | |
813 | assert(k->has_variable_vring_alignment); | |
814 | ||
815 | vdev->vq[n].vring.align = align; | |
ab223c95 | 816 | virtio_queue_update_rings(vdev, n); |
6ce69d1c PM |
817 | } |
818 | ||
25db9ebe SH |
819 | void virtio_queue_notify_vq(VirtQueue *vq) |
820 | { | |
9e0f5b81 | 821 | if (vq->vring.desc && vq->handle_output) { |
25db9ebe | 822 | VirtIODevice *vdev = vq->vdev; |
9e0f5b81 | 823 | |
25db9ebe SH |
824 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
825 | vq->handle_output(vdev, vq); | |
826 | } | |
827 | } | |
828 | ||
53c25cea PB |
829 | void virtio_queue_notify(VirtIODevice *vdev, int n) |
830 | { | |
7157e2e2 | 831 | virtio_queue_notify_vq(&vdev->vq[n]); |
967f97fa AL |
832 | } |
833 | ||
7055e687 MT |
834 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) |
835 | { | |
87b3bd1c | 836 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : |
7055e687 MT |
837 | VIRTIO_NO_VECTOR; |
838 | } | |
839 | ||
840 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) | |
841 | { | |
e0d686bf JW |
842 | VirtQueue *vq = &vdev->vq[n]; |
843 | ||
87b3bd1c | 844 | if (n < VIRTIO_QUEUE_MAX) { |
e0d686bf JW |
845 | if (vdev->vector_queues && |
846 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { | |
847 | QLIST_REMOVE(vq, node); | |
848 | } | |
7055e687 | 849 | vdev->vq[n].vector = vector; |
e0d686bf JW |
850 | if (vdev->vector_queues && |
851 | vector != VIRTIO_NO_VECTOR) { | |
852 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); | |
853 | } | |
854 | } | |
7055e687 MT |
855 | } |
856 | ||
967f97fa AL |
857 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, |
858 | void (*handle_output)(VirtIODevice *, VirtQueue *)) | |
859 | { | |
860 | int i; | |
861 | ||
87b3bd1c | 862 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
863 | if (vdev->vq[i].vring.num == 0) |
864 | break; | |
865 | } | |
866 | ||
87b3bd1c | 867 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) |
967f97fa AL |
868 | abort(); |
869 | ||
870 | vdev->vq[i].vring.num = queue_size; | |
6ce69d1c | 871 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; |
967f97fa AL |
872 | vdev->vq[i].handle_output = handle_output; |
873 | ||
874 | return &vdev->vq[i]; | |
875 | } | |
876 | ||
f23fd811 JW |
877 | void virtio_del_queue(VirtIODevice *vdev, int n) |
878 | { | |
87b3bd1c | 879 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { |
f23fd811 JW |
880 | abort(); |
881 | } | |
882 | ||
883 | vdev->vq[n].vring.num = 0; | |
884 | } | |
885 | ||
1cbdabe2 MT |
886 | void virtio_irq(VirtQueue *vq) |
887 | { | |
64979a4d | 888 | trace_virtio_irq(vq); |
1cbdabe2 MT |
889 | vq->vdev->isr |= 0x01; |
890 | virtio_notify_vector(vq->vdev, vq->vector); | |
891 | } | |
892 | ||
bcbabae8 MT |
893 | static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq) |
894 | { | |
895 | uint16_t old, new; | |
896 | bool v; | |
a281ebc1 MT |
897 | /* We need to expose used array entries before checking used event. */ |
898 | smp_mb(); | |
97b83deb | 899 | /* Always notify when queue is empty (when feature acknowledge) */ |
ef546f12 CH |
900 | if (virtio_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && |
901 | !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx) { | |
bcbabae8 MT |
902 | return true; |
903 | } | |
904 | ||
ef546f12 | 905 | if (!virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
bcbabae8 MT |
906 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); |
907 | } | |
908 | ||
909 | v = vq->signalled_used_valid; | |
910 | vq->signalled_used_valid = true; | |
911 | old = vq->signalled_used; | |
912 | new = vq->signalled_used = vring_used_idx(vq); | |
e9600c6c | 913 | return !v || vring_need_event(vring_get_used_event(vq), new, old); |
bcbabae8 MT |
914 | } |
915 | ||
916 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) | |
917 | { | |
918 | if (!vring_notify(vdev, vq)) { | |
967f97fa | 919 | return; |
bcbabae8 | 920 | } |
967f97fa | 921 | |
64979a4d | 922 | trace_virtio_notify(vdev, vq); |
967f97fa | 923 | vdev->isr |= 0x01; |
7055e687 | 924 | virtio_notify_vector(vdev, vq->vector); |
967f97fa AL |
925 | } |
926 | ||
927 | void virtio_notify_config(VirtIODevice *vdev) | |
928 | { | |
7625162c AL |
929 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) |
930 | return; | |
931 | ||
967f97fa | 932 | vdev->isr |= 0x03; |
b8f05908 | 933 | vdev->generation++; |
7055e687 | 934 | virtio_notify_vector(vdev, vdev->config_vector); |
967f97fa AL |
935 | } |
936 | ||
616a6552 GK |
937 | static bool virtio_device_endian_needed(void *opaque) |
938 | { | |
939 | VirtIODevice *vdev = opaque; | |
940 | ||
941 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); | |
3c185597 CH |
942 | if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
943 | return vdev->device_endian != virtio_default_endian(); | |
944 | } | |
945 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
946 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; | |
616a6552 GK |
947 | } |
948 | ||
019a3edb GH |
949 | static bool virtio_64bit_features_needed(void *opaque) |
950 | { | |
951 | VirtIODevice *vdev = opaque; | |
952 | ||
953 | return (vdev->host_features >> 32) != 0; | |
954 | } | |
955 | ||
616a6552 GK |
956 | static const VMStateDescription vmstate_virtio_device_endian = { |
957 | .name = "virtio/device_endian", | |
958 | .version_id = 1, | |
959 | .minimum_version_id = 1, | |
960 | .fields = (VMStateField[]) { | |
961 | VMSTATE_UINT8(device_endian, VirtIODevice), | |
962 | VMSTATE_END_OF_LIST() | |
963 | } | |
964 | }; | |
965 | ||
019a3edb GH |
966 | static const VMStateDescription vmstate_virtio_64bit_features = { |
967 | .name = "virtio/64bit_features", | |
968 | .version_id = 1, | |
969 | .minimum_version_id = 1, | |
970 | .fields = (VMStateField[]) { | |
971 | VMSTATE_UINT64(guest_features, VirtIODevice), | |
972 | VMSTATE_END_OF_LIST() | |
973 | } | |
974 | }; | |
975 | ||
6b321a3d GK |
976 | static const VMStateDescription vmstate_virtio = { |
977 | .name = "virtio", | |
978 | .version_id = 1, | |
979 | .minimum_version_id = 1, | |
980 | .minimum_version_id_old = 1, | |
981 | .fields = (VMStateField[]) { | |
982 | VMSTATE_END_OF_LIST() | |
616a6552 GK |
983 | }, |
984 | .subsections = (VMStateSubsection[]) { | |
985 | { | |
986 | .vmsd = &vmstate_virtio_device_endian, | |
987 | .needed = &virtio_device_endian_needed | |
988 | }, | |
019a3edb GH |
989 | { |
990 | .vmsd = &vmstate_virtio_64bit_features, | |
991 | .needed = &virtio_64bit_features_needed | |
992 | }, | |
616a6552 | 993 | { 0 } |
6b321a3d GK |
994 | } |
995 | }; | |
996 | ||
967f97fa AL |
997 | void virtio_save(VirtIODevice *vdev, QEMUFile *f) |
998 | { | |
1c819449 FK |
999 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1000 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 1001 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
019a3edb | 1002 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); |
967f97fa AL |
1003 | int i; |
1004 | ||
1c819449 FK |
1005 | if (k->save_config) { |
1006 | k->save_config(qbus->parent, f); | |
1007 | } | |
967f97fa | 1008 | |
967f97fa AL |
1009 | qemu_put_8s(f, &vdev->status); |
1010 | qemu_put_8s(f, &vdev->isr); | |
1011 | qemu_put_be16s(f, &vdev->queue_sel); | |
019a3edb | 1012 | qemu_put_be32s(f, &guest_features_lo); |
967f97fa AL |
1013 | qemu_put_be32(f, vdev->config_len); |
1014 | qemu_put_buffer(f, vdev->config, vdev->config_len); | |
1015 | ||
87b3bd1c | 1016 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1017 | if (vdev->vq[i].vring.num == 0) |
1018 | break; | |
1019 | } | |
1020 | ||
1021 | qemu_put_be32(f, i); | |
1022 | ||
87b3bd1c | 1023 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1024 | if (vdev->vq[i].vring.num == 0) |
1025 | break; | |
1026 | ||
1027 | qemu_put_be32(f, vdev->vq[i].vring.num); | |
6ce69d1c PM |
1028 | if (k->has_variable_vring_alignment) { |
1029 | qemu_put_be32(f, vdev->vq[i].vring.align); | |
1030 | } | |
ab223c95 CH |
1031 | /* XXX virtio-1 devices */ |
1032 | qemu_put_be64(f, vdev->vq[i].vring.desc); | |
967f97fa | 1033 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
1c819449 FK |
1034 | if (k->save_queue) { |
1035 | k->save_queue(qbus->parent, i, f); | |
1036 | } | |
967f97fa | 1037 | } |
1b5fc0de GK |
1038 | |
1039 | if (vdc->save != NULL) { | |
1040 | vdc->save(vdev, f); | |
1041 | } | |
6b321a3d GK |
1042 | |
1043 | /* Subsections */ | |
8118f095 | 1044 | vmstate_save_state(f, &vmstate_virtio, vdev, NULL); |
967f97fa AL |
1045 | } |
1046 | ||
6c0196d7 | 1047 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) |
ad0c9332 | 1048 | { |
181103cd | 1049 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
6b8f1020 | 1050 | bool bad = (val & ~(vdev->host_features)) != 0; |
ad0c9332 | 1051 | |
6b8f1020 | 1052 | val &= vdev->host_features; |
181103cd FK |
1053 | if (k->set_features) { |
1054 | k->set_features(vdev, val); | |
ad0c9332 PB |
1055 | } |
1056 | vdev->guest_features = val; | |
1057 | return bad ? -1 : 0; | |
1058 | } | |
1059 | ||
6c0196d7 CH |
1060 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) |
1061 | { | |
1062 | /* | |
1063 | * The driver must not attempt to set features after feature negotiation | |
1064 | * has finished. | |
1065 | */ | |
1066 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { | |
1067 | return -EINVAL; | |
1068 | } | |
1069 | return virtio_set_features_nocheck(vdev, val); | |
1070 | } | |
1071 | ||
1b5fc0de | 1072 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |
967f97fa | 1073 | { |
cc459952 | 1074 | int i, ret; |
a890a2f9 | 1075 | int32_t config_len; |
cc459952 | 1076 | uint32_t num; |
6d74ca5a | 1077 | uint32_t features; |
1c819449 FK |
1078 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1079 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 1080 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa | 1081 | |
616a6552 GK |
1082 | /* |
1083 | * We poison the endianness to ensure it does not get used before | |
1084 | * subsections have been loaded. | |
1085 | */ | |
1086 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; | |
1087 | ||
1c819449 FK |
1088 | if (k->load_config) { |
1089 | ret = k->load_config(qbus->parent, f); | |
ff24bd58 MT |
1090 | if (ret) |
1091 | return ret; | |
1092 | } | |
967f97fa | 1093 | |
967f97fa AL |
1094 | qemu_get_8s(f, &vdev->status); |
1095 | qemu_get_8s(f, &vdev->isr); | |
1096 | qemu_get_be16s(f, &vdev->queue_sel); | |
87b3bd1c | 1097 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { |
4b53c2c7 MR |
1098 | return -1; |
1099 | } | |
6d74ca5a | 1100 | qemu_get_be32s(f, &features); |
ad0c9332 | 1101 | |
a890a2f9 | 1102 | config_len = qemu_get_be32(f); |
2f5732e9 DDAG |
1103 | |
1104 | /* | |
1105 | * There are cases where the incoming config can be bigger or smaller | |
1106 | * than what we have; so load what we have space for, and skip | |
1107 | * any excess that's in the stream. | |
1108 | */ | |
1109 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); | |
1110 | ||
1111 | while (config_len > vdev->config_len) { | |
1112 | qemu_get_byte(f); | |
1113 | config_len--; | |
a890a2f9 | 1114 | } |
967f97fa AL |
1115 | |
1116 | num = qemu_get_be32(f); | |
1117 | ||
87b3bd1c | 1118 | if (num > VIRTIO_QUEUE_MAX) { |
cc459952 MT |
1119 | error_report("Invalid number of PCI queues: 0x%x", num); |
1120 | return -1; | |
1121 | } | |
1122 | ||
967f97fa AL |
1123 | for (i = 0; i < num; i++) { |
1124 | vdev->vq[i].vring.num = qemu_get_be32(f); | |
6ce69d1c PM |
1125 | if (k->has_variable_vring_alignment) { |
1126 | vdev->vq[i].vring.align = qemu_get_be32(f); | |
1127 | } | |
ab223c95 | 1128 | vdev->vq[i].vring.desc = qemu_get_be64(f); |
967f97fa | 1129 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
bcbabae8 MT |
1130 | vdev->vq[i].signalled_used_valid = false; |
1131 | vdev->vq[i].notification = true; | |
967f97fa | 1132 | |
ab223c95 CH |
1133 | if (vdev->vq[i].vring.desc) { |
1134 | /* XXX virtio-1 devices */ | |
1135 | virtio_queue_update_rings(vdev, i); | |
1abeb5a6 MT |
1136 | } else if (vdev->vq[i].last_avail_idx) { |
1137 | error_report("VQ %d address 0x0 " | |
6daf194d | 1138 | "inconsistent with Host index 0x%x", |
1abeb5a6 MT |
1139 | i, vdev->vq[i].last_avail_idx); |
1140 | return -1; | |
258dc7c9 | 1141 | } |
1c819449 FK |
1142 | if (k->load_queue) { |
1143 | ret = k->load_queue(qbus->parent, i, f); | |
ff24bd58 MT |
1144 | if (ret) |
1145 | return ret; | |
7055e687 | 1146 | } |
967f97fa AL |
1147 | } |
1148 | ||
7055e687 | 1149 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
1b5fc0de GK |
1150 | |
1151 | if (vdc->load != NULL) { | |
6b321a3d GK |
1152 | ret = vdc->load(vdev, f, version_id); |
1153 | if (ret) { | |
1154 | return ret; | |
1155 | } | |
1b5fc0de GK |
1156 | } |
1157 | ||
616a6552 GK |
1158 | /* Subsections */ |
1159 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); | |
1160 | if (ret) { | |
1161 | return ret; | |
1162 | } | |
1163 | ||
1164 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { | |
1165 | vdev->device_endian = virtio_default_endian(); | |
1166 | } | |
1167 | ||
019a3edb GH |
1168 | if (virtio_64bit_features_needed(vdev)) { |
1169 | /* | |
1170 | * Subsection load filled vdev->guest_features. Run them | |
1171 | * through virtio_set_features to sanity-check them against | |
1172 | * host_features. | |
1173 | */ | |
1174 | uint64_t features64 = vdev->guest_features; | |
6c0196d7 | 1175 | if (virtio_set_features_nocheck(vdev, features64) < 0) { |
019a3edb GH |
1176 | error_report("Features 0x%" PRIx64 " unsupported. " |
1177 | "Allowed features: 0x%" PRIx64, | |
1178 | features64, vdev->host_features); | |
1179 | return -1; | |
1180 | } | |
1181 | } else { | |
6c0196d7 | 1182 | if (virtio_set_features_nocheck(vdev, features) < 0) { |
019a3edb GH |
1183 | error_report("Features 0x%x unsupported. " |
1184 | "Allowed features: 0x%" PRIx64, | |
1185 | features, vdev->host_features); | |
1186 | return -1; | |
1187 | } | |
1188 | } | |
1189 | ||
616a6552 | 1190 | for (i = 0; i < num; i++) { |
ab223c95 | 1191 | if (vdev->vq[i].vring.desc) { |
616a6552 GK |
1192 | uint16_t nheads; |
1193 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; | |
1194 | /* Check it isn't doing strange things with descriptor numbers. */ | |
1195 | if (nheads > vdev->vq[i].vring.num) { | |
1196 | error_report("VQ %d size 0x%x Guest index 0x%x " | |
1197 | "inconsistent with Host index 0x%x: delta 0x%x", | |
1198 | i, vdev->vq[i].vring.num, | |
1199 | vring_avail_idx(&vdev->vq[i]), | |
1200 | vdev->vq[i].last_avail_idx, nheads); | |
1201 | return -1; | |
1202 | } | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | return 0; | |
967f97fa AL |
1207 | } |
1208 | ||
6a1a8cc7 | 1209 | void virtio_cleanup(VirtIODevice *vdev) |
b946a153 | 1210 | { |
85cf2a8d | 1211 | qemu_del_vm_change_state_handler(vdev->vmstate); |
6f79e06b | 1212 | g_free(vdev->config); |
7267c094 | 1213 | g_free(vdev->vq); |
e0d686bf | 1214 | g_free(vdev->vector_queues); |
8e05db92 FK |
1215 | } |
1216 | ||
1dfb4dd9 | 1217 | static void virtio_vmstate_change(void *opaque, int running, RunState state) |
85cf2a8d MT |
1218 | { |
1219 | VirtIODevice *vdev = opaque; | |
1c819449 FK |
1220 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1221 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
85cf2a8d | 1222 | bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK); |
9e8e8c48 | 1223 | vdev->vm_running = running; |
85cf2a8d MT |
1224 | |
1225 | if (backend_run) { | |
1226 | virtio_set_status(vdev, vdev->status); | |
1227 | } | |
1228 | ||
1c819449 FK |
1229 | if (k->vmstate_change) { |
1230 | k->vmstate_change(qbus->parent, backend_run); | |
85cf2a8d MT |
1231 | } |
1232 | ||
1233 | if (!backend_run) { | |
1234 | virtio_set_status(vdev, vdev->status); | |
1235 | } | |
1236 | } | |
1237 | ||
c8075caf GA |
1238 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
1239 | size_t vdev_size, const char *vdev_name) | |
1240 | { | |
1241 | DeviceState *vdev = data; | |
1242 | ||
1243 | object_initialize(vdev, vdev_size, vdev_name); | |
1244 | object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL); | |
1245 | object_unref(OBJECT(vdev)); | |
1246 | qdev_alias_all_properties(vdev, proxy_obj); | |
1247 | } | |
1248 | ||
8e05db92 FK |
1249 | void virtio_init(VirtIODevice *vdev, const char *name, |
1250 | uint16_t device_id, size_t config_size) | |
967f97fa | 1251 | { |
e0d686bf JW |
1252 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1253 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
b8193adb | 1254 | int i; |
e0d686bf JW |
1255 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; |
1256 | ||
1257 | if (nvectors) { | |
1258 | vdev->vector_queues = | |
1259 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); | |
1260 | } | |
1261 | ||
53c25cea | 1262 | vdev->device_id = device_id; |
967f97fa AL |
1263 | vdev->status = 0; |
1264 | vdev->isr = 0; | |
1265 | vdev->queue_sel = 0; | |
7055e687 | 1266 | vdev->config_vector = VIRTIO_NO_VECTOR; |
87b3bd1c | 1267 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); |
1354869c | 1268 | vdev->vm_running = runstate_is_running(); |
87b3bd1c | 1269 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
b8193adb | 1270 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
1cbdabe2 | 1271 | vdev->vq[i].vdev = vdev; |
e78a2b42 | 1272 | vdev->vq[i].queue_index = i; |
1cbdabe2 | 1273 | } |
967f97fa | 1274 | |
967f97fa AL |
1275 | vdev->name = name; |
1276 | vdev->config_len = config_size; | |
8e05db92 | 1277 | if (vdev->config_len) { |
7267c094 | 1278 | vdev->config = g_malloc0(config_size); |
8e05db92 | 1279 | } else { |
967f97fa | 1280 | vdev->config = NULL; |
8e05db92 FK |
1281 | } |
1282 | vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, | |
1283 | vdev); | |
616a6552 | 1284 | vdev->device_endian = virtio_default_endian(); |
8e05db92 | 1285 | } |
967f97fa | 1286 | |
a8170e5e | 1287 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1288 | { |
1289 | return vdev->vq[n].vring.desc; | |
1290 | } | |
1291 | ||
a8170e5e | 1292 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1293 | { |
1294 | return vdev->vq[n].vring.avail; | |
1295 | } | |
1296 | ||
a8170e5e | 1297 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1298 | { |
1299 | return vdev->vq[n].vring.used; | |
1300 | } | |
1301 | ||
a8170e5e | 1302 | hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1303 | { |
1304 | return vdev->vq[n].vring.desc; | |
1305 | } | |
1306 | ||
a8170e5e | 1307 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1308 | { |
1309 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; | |
1310 | } | |
1311 | ||
a8170e5e | 1312 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1313 | { |
1314 | return offsetof(VRingAvail, ring) + | |
2b3af999 | 1315 | sizeof(uint64_t) * vdev->vq[n].vring.num; |
1cbdabe2 MT |
1316 | } |
1317 | ||
a8170e5e | 1318 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1319 | { |
1320 | return offsetof(VRingUsed, ring) + | |
1321 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num; | |
1322 | } | |
1323 | ||
a8170e5e | 1324 | hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1325 | { |
1326 | return vdev->vq[n].vring.used - vdev->vq[n].vring.desc + | |
1327 | virtio_queue_get_used_size(vdev, n); | |
1328 | } | |
1329 | ||
1330 | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) | |
1331 | { | |
1332 | return vdev->vq[n].last_avail_idx; | |
1333 | } | |
1334 | ||
1335 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) | |
1336 | { | |
1337 | vdev->vq[n].last_avail_idx = idx; | |
1338 | } | |
1339 | ||
6793dfd1 SH |
1340 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) |
1341 | { | |
1342 | vdev->vq[n].signalled_used_valid = false; | |
1343 | } | |
1344 | ||
1cbdabe2 MT |
1345 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) |
1346 | { | |
1347 | return vdev->vq + n; | |
1348 | } | |
1349 | ||
e78a2b42 JW |
1350 | uint16_t virtio_get_queue_index(VirtQueue *vq) |
1351 | { | |
1352 | return vq->queue_index; | |
1353 | } | |
1354 | ||
15b2bd18 PB |
1355 | static void virtio_queue_guest_notifier_read(EventNotifier *n) |
1356 | { | |
1357 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); | |
1358 | if (event_notifier_test_and_clear(n)) { | |
1359 | virtio_irq(vq); | |
1360 | } | |
1361 | } | |
1362 | ||
1363 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, | |
1364 | bool with_irqfd) | |
1365 | { | |
1366 | if (assign && !with_irqfd) { | |
1367 | event_notifier_set_handler(&vq->guest_notifier, | |
1368 | virtio_queue_guest_notifier_read); | |
1369 | } else { | |
1370 | event_notifier_set_handler(&vq->guest_notifier, NULL); | |
1371 | } | |
1372 | if (!assign) { | |
1373 | /* Test and clear notifier before closing it, | |
1374 | * in case poll callback didn't have time to run. */ | |
1375 | virtio_queue_guest_notifier_read(&vq->guest_notifier); | |
1376 | } | |
1377 | } | |
1378 | ||
1cbdabe2 MT |
1379 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
1380 | { | |
1381 | return &vq->guest_notifier; | |
1382 | } | |
b1f416aa PB |
1383 | |
1384 | static void virtio_queue_host_notifier_read(EventNotifier *n) | |
1385 | { | |
1386 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
1387 | if (event_notifier_test_and_clear(n)) { | |
1388 | virtio_queue_notify_vq(vq); | |
1389 | } | |
1390 | } | |
1391 | ||
26b9b5fe PB |
1392 | void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, |
1393 | bool set_handler) | |
b1f416aa | 1394 | { |
26b9b5fe | 1395 | if (assign && set_handler) { |
b1f416aa PB |
1396 | event_notifier_set_handler(&vq->host_notifier, |
1397 | virtio_queue_host_notifier_read); | |
1398 | } else { | |
1399 | event_notifier_set_handler(&vq->host_notifier, NULL); | |
26b9b5fe PB |
1400 | } |
1401 | if (!assign) { | |
b1f416aa PB |
1402 | /* Test and clear notifier before after disabling event, |
1403 | * in case poll callback didn't have time to run. */ | |
1404 | virtio_queue_host_notifier_read(&vq->host_notifier); | |
1405 | } | |
1406 | } | |
1407 | ||
1cbdabe2 MT |
1408 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
1409 | { | |
1410 | return &vq->host_notifier; | |
1411 | } | |
8e05db92 | 1412 | |
1034e9cf FK |
1413 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) |
1414 | { | |
9e288406 | 1415 | g_free(vdev->bus_name); |
80e0090a | 1416 | vdev->bus_name = g_strdup(bus_name); |
1034e9cf FK |
1417 | } |
1418 | ||
1d244b42 AF |
1419 | static void virtio_device_realize(DeviceState *dev, Error **errp) |
1420 | { | |
1421 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
1422 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
1423 | Error *err = NULL; | |
1424 | ||
1d244b42 AF |
1425 | if (vdc->realize != NULL) { |
1426 | vdc->realize(dev, &err); | |
1427 | if (err != NULL) { | |
1428 | error_propagate(errp, err); | |
1429 | return; | |
1430 | } | |
8e05db92 | 1431 | } |
e8398045 JW |
1432 | |
1433 | virtio_bus_device_plugged(vdev, &err); | |
1434 | if (err != NULL) { | |
1435 | error_propagate(errp, err); | |
1436 | return; | |
1437 | } | |
8e05db92 FK |
1438 | } |
1439 | ||
1d244b42 | 1440 | static void virtio_device_unrealize(DeviceState *dev, Error **errp) |
1034e9cf | 1441 | { |
1d244b42 | 1442 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
306ec6c3 AF |
1443 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
1444 | Error *err = NULL; | |
1d244b42 | 1445 | |
83d07047 PB |
1446 | virtio_bus_device_unplugged(vdev); |
1447 | ||
306ec6c3 AF |
1448 | if (vdc->unrealize != NULL) { |
1449 | vdc->unrealize(dev, &err); | |
1450 | if (err != NULL) { | |
1451 | error_propagate(errp, err); | |
1452 | return; | |
1453 | } | |
5e96f5d2 | 1454 | } |
1d244b42 | 1455 | |
9e288406 MA |
1456 | g_free(vdev->bus_name); |
1457 | vdev->bus_name = NULL; | |
1034e9cf FK |
1458 | } |
1459 | ||
6b8f1020 CH |
1460 | static Property virtio_properties[] = { |
1461 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), | |
1462 | DEFINE_PROP_END_OF_LIST(), | |
1463 | }; | |
1464 | ||
8e05db92 FK |
1465 | static void virtio_device_class_init(ObjectClass *klass, void *data) |
1466 | { | |
1467 | /* Set the default value here. */ | |
1468 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1d244b42 AF |
1469 | |
1470 | dc->realize = virtio_device_realize; | |
1471 | dc->unrealize = virtio_device_unrealize; | |
8e05db92 | 1472 | dc->bus_type = TYPE_VIRTIO_BUS; |
6b8f1020 | 1473 | dc->props = virtio_properties; |
8e05db92 FK |
1474 | } |
1475 | ||
1476 | static const TypeInfo virtio_device_info = { | |
1477 | .name = TYPE_VIRTIO_DEVICE, | |
1478 | .parent = TYPE_DEVICE, | |
1479 | .instance_size = sizeof(VirtIODevice), | |
1480 | .class_init = virtio_device_class_init, | |
1481 | .abstract = true, | |
1482 | .class_size = sizeof(VirtioDeviceClass), | |
1483 | }; | |
1484 | ||
1485 | static void virtio_register_types(void) | |
1486 | { | |
1487 | type_register_static(&virtio_device_info); | |
1488 | } | |
1489 | ||
1490 | type_init(virtio_register_types) |