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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 | ||
9b8bfe21 | 14 | #include "qemu/osdep.h" |
da34e65c | 15 | #include "qapi/error.h" |
4771d756 PB |
16 | #include "qemu-common.h" |
17 | #include "cpu.h" | |
64979a4d | 18 | #include "trace.h" |
fdfba1a2 | 19 | #include "exec/address-spaces.h" |
1de7afc9 | 20 | #include "qemu/error-report.h" |
0d09e41a | 21 | #include "hw/virtio/virtio.h" |
1de7afc9 | 22 | #include "qemu/atomic.h" |
0d09e41a | 23 | #include "hw/virtio/virtio-bus.h" |
6b321a3d | 24 | #include "migration/migration.h" |
cee3ca00 | 25 | #include "hw/virtio/virtio-access.h" |
967f97fa | 26 | |
6ce69d1c PM |
27 | /* |
28 | * The alignment to use between consumer and producer parts of vring. | |
29 | * x86 pagesize again. This is the default, used by transports like PCI | |
30 | * which don't provide a means for the guest to tell the host the alignment. | |
31 | */ | |
f46f15bc AL |
32 | #define VIRTIO_PCI_VRING_ALIGN 4096 |
33 | ||
967f97fa AL |
34 | typedef struct VRingDesc |
35 | { | |
36 | uint64_t addr; | |
37 | uint32_t len; | |
38 | uint16_t flags; | |
39 | uint16_t next; | |
40 | } VRingDesc; | |
41 | ||
42 | typedef struct VRingAvail | |
43 | { | |
44 | uint16_t flags; | |
45 | uint16_t idx; | |
46 | uint16_t ring[0]; | |
47 | } VRingAvail; | |
48 | ||
49 | typedef struct VRingUsedElem | |
50 | { | |
51 | uint32_t id; | |
52 | uint32_t len; | |
53 | } VRingUsedElem; | |
54 | ||
55 | typedef struct VRingUsed | |
56 | { | |
57 | uint16_t flags; | |
58 | uint16_t idx; | |
59 | VRingUsedElem ring[0]; | |
60 | } VRingUsed; | |
61 | ||
62 | typedef struct VRing | |
63 | { | |
64 | unsigned int num; | |
46c5d082 | 65 | unsigned int num_default; |
6ce69d1c | 66 | unsigned int align; |
a8170e5e AK |
67 | hwaddr desc; |
68 | hwaddr avail; | |
69 | hwaddr used; | |
967f97fa AL |
70 | } VRing; |
71 | ||
72 | struct VirtQueue | |
73 | { | |
74 | VRing vring; | |
be1fea9b VM |
75 | |
76 | /* Next head to pop */ | |
967f97fa | 77 | uint16_t last_avail_idx; |
b796fcd1 | 78 | |
be1fea9b VM |
79 | /* Last avail_idx read from VQ. */ |
80 | uint16_t shadow_avail_idx; | |
81 | ||
b796fcd1 VM |
82 | uint16_t used_idx; |
83 | ||
bcbabae8 MT |
84 | /* Last used index value we have signalled on */ |
85 | uint16_t signalled_used; | |
86 | ||
87 | /* Last used index value we have signalled on */ | |
88 | bool signalled_used_valid; | |
89 | ||
90 | /* Notification enabled? */ | |
91 | bool notification; | |
92 | ||
e78a2b42 JW |
93 | uint16_t queue_index; |
94 | ||
967f97fa | 95 | int inuse; |
bcbabae8 | 96 | |
7055e687 | 97 | uint16_t vector; |
bf1780b0 FZ |
98 | VirtIOHandleOutput handle_output; |
99 | VirtIOHandleOutput handle_aio_output; | |
872dd82c | 100 | bool use_aio; |
1cbdabe2 MT |
101 | VirtIODevice *vdev; |
102 | EventNotifier guest_notifier; | |
103 | EventNotifier host_notifier; | |
e0d686bf | 104 | QLIST_ENTRY(VirtQueue) node; |
967f97fa AL |
105 | }; |
106 | ||
967f97fa | 107 | /* virt queue functions */ |
ab223c95 | 108 | void virtio_queue_update_rings(VirtIODevice *vdev, int n) |
967f97fa | 109 | { |
ab223c95 | 110 | VRing *vring = &vdev->vq[n].vring; |
53c25cea | 111 | |
ab223c95 CH |
112 | if (!vring->desc) { |
113 | /* not yet setup -> nothing to do */ | |
114 | return; | |
115 | } | |
116 | vring->avail = vring->desc + vring->num * sizeof(VRingDesc); | |
117 | vring->used = vring_align(vring->avail + | |
118 | offsetof(VRingAvail, ring[vring->num]), | |
119 | vring->align); | |
967f97fa AL |
120 | } |
121 | ||
aa570d6f PB |
122 | static void vring_desc_read(VirtIODevice *vdev, VRingDesc *desc, |
123 | hwaddr desc_pa, int i) | |
967f97fa | 124 | { |
aa570d6f PB |
125 | address_space_read(&address_space_memory, desc_pa + i * sizeof(VRingDesc), |
126 | MEMTXATTRS_UNSPECIFIED, (void *)desc, sizeof(VRingDesc)); | |
127 | virtio_tswap64s(vdev, &desc->addr); | |
128 | virtio_tswap32s(vdev, &desc->len); | |
129 | virtio_tswap16s(vdev, &desc->flags); | |
130 | virtio_tswap16s(vdev, &desc->next); | |
967f97fa AL |
131 | } |
132 | ||
133 | static inline uint16_t vring_avail_flags(VirtQueue *vq) | |
134 | { | |
a8170e5e | 135 | hwaddr pa; |
967f97fa | 136 | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
cee3ca00 | 137 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
138 | } |
139 | ||
140 | static inline uint16_t vring_avail_idx(VirtQueue *vq) | |
141 | { | |
a8170e5e | 142 | hwaddr pa; |
967f97fa | 143 | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
be1fea9b VM |
144 | vq->shadow_avail_idx = virtio_lduw_phys(vq->vdev, pa); |
145 | return vq->shadow_avail_idx; | |
967f97fa AL |
146 | } |
147 | ||
148 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) | |
149 | { | |
a8170e5e | 150 | hwaddr pa; |
967f97fa | 151 | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
cee3ca00 | 152 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
153 | } |
154 | ||
e9600c6c | 155 | static inline uint16_t vring_get_used_event(VirtQueue *vq) |
bcbabae8 MT |
156 | { |
157 | return vring_avail_ring(vq, vq->vring.num); | |
158 | } | |
159 | ||
1cdd2ee5 VM |
160 | static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem, |
161 | int i) | |
967f97fa | 162 | { |
a8170e5e | 163 | hwaddr pa; |
1cdd2ee5 VM |
164 | virtio_tswap32s(vq->vdev, &uelem->id); |
165 | virtio_tswap32s(vq->vdev, &uelem->len); | |
166 | pa = vq->vring.used + offsetof(VRingUsed, ring[i]); | |
167 | address_space_write(&address_space_memory, pa, MEMTXATTRS_UNSPECIFIED, | |
168 | (void *)uelem, sizeof(VRingUsedElem)); | |
967f97fa AL |
169 | } |
170 | ||
171 | static uint16_t vring_used_idx(VirtQueue *vq) | |
172 | { | |
a8170e5e | 173 | hwaddr pa; |
967f97fa | 174 | pa = vq->vring.used + offsetof(VRingUsed, idx); |
cee3ca00 | 175 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
176 | } |
177 | ||
bcbabae8 | 178 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
967f97fa | 179 | { |
a8170e5e | 180 | hwaddr pa; |
967f97fa | 181 | pa = vq->vring.used + offsetof(VRingUsed, idx); |
cee3ca00 | 182 | virtio_stw_phys(vq->vdev, pa, val); |
b796fcd1 | 183 | vq->used_idx = val; |
967f97fa AL |
184 | } |
185 | ||
186 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) | |
187 | { | |
cee3ca00 | 188 | VirtIODevice *vdev = vq->vdev; |
a8170e5e | 189 | hwaddr pa; |
967f97fa | 190 | pa = vq->vring.used + offsetof(VRingUsed, flags); |
cee3ca00 | 191 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) | mask); |
967f97fa AL |
192 | } |
193 | ||
194 | static inline void vring_used_flags_unset_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 | ||
e9600c6c | 202 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) |
bcbabae8 | 203 | { |
a8170e5e | 204 | hwaddr pa; |
bcbabae8 MT |
205 | if (!vq->notification) { |
206 | return; | |
207 | } | |
208 | pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]); | |
cee3ca00 | 209 | virtio_stw_phys(vq->vdev, pa, val); |
bcbabae8 MT |
210 | } |
211 | ||
967f97fa AL |
212 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
213 | { | |
bcbabae8 | 214 | vq->notification = enable; |
95129d6f | 215 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 216 | vring_set_avail_event(vq, vring_avail_idx(vq)); |
bcbabae8 | 217 | } else if (enable) { |
967f97fa | 218 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 219 | } else { |
967f97fa | 220 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 221 | } |
92045d80 MT |
222 | if (enable) { |
223 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
224 | smp_mb(); | |
225 | } | |
967f97fa AL |
226 | } |
227 | ||
228 | int virtio_queue_ready(VirtQueue *vq) | |
229 | { | |
230 | return vq->vring.avail != 0; | |
231 | } | |
232 | ||
be1fea9b VM |
233 | /* Fetch avail_idx from VQ memory only when we really need to know if |
234 | * guest has added some buffers. */ | |
967f97fa AL |
235 | int virtio_queue_empty(VirtQueue *vq) |
236 | { | |
be1fea9b VM |
237 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
238 | return 0; | |
239 | } | |
240 | ||
967f97fa AL |
241 | return vring_avail_idx(vq) == vq->last_avail_idx; |
242 | } | |
243 | ||
ce317461 JW |
244 | static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, |
245 | unsigned int len) | |
967f97fa AL |
246 | { |
247 | unsigned int offset; | |
248 | int i; | |
249 | ||
967f97fa AL |
250 | offset = 0; |
251 | for (i = 0; i < elem->in_num; i++) { | |
252 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); | |
253 | ||
26b258e1 AL |
254 | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
255 | elem->in_sg[i].iov_len, | |
256 | 1, size); | |
967f97fa | 257 | |
0cea71a2 | 258 | offset += size; |
967f97fa AL |
259 | } |
260 | ||
26b258e1 AL |
261 | for (i = 0; i < elem->out_num; i++) |
262 | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, | |
263 | elem->out_sg[i].iov_len, | |
264 | 0, elem->out_sg[i].iov_len); | |
ce317461 JW |
265 | } |
266 | ||
29b9f5ef JW |
267 | void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem, |
268 | unsigned int len) | |
269 | { | |
270 | vq->last_avail_idx--; | |
58a83c61 | 271 | vq->inuse--; |
29b9f5ef JW |
272 | virtqueue_unmap_sg(vq, elem, len); |
273 | } | |
274 | ||
ce317461 JW |
275 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
276 | unsigned int len, unsigned int idx) | |
277 | { | |
1cdd2ee5 VM |
278 | VRingUsedElem uelem; |
279 | ||
ce317461 JW |
280 | trace_virtqueue_fill(vq, elem, len, idx); |
281 | ||
282 | virtqueue_unmap_sg(vq, elem, len); | |
26b258e1 | 283 | |
b796fcd1 | 284 | idx = (idx + vq->used_idx) % vq->vring.num; |
967f97fa | 285 | |
1cdd2ee5 VM |
286 | uelem.id = elem->index; |
287 | uelem.len = len; | |
288 | vring_used_write(vq, &uelem, idx); | |
967f97fa AL |
289 | } |
290 | ||
291 | void virtqueue_flush(VirtQueue *vq, unsigned int count) | |
292 | { | |
bcbabae8 | 293 | uint16_t old, new; |
967f97fa | 294 | /* Make sure buffer is written before we update index. */ |
b90d2f35 | 295 | smp_wmb(); |
64979a4d | 296 | trace_virtqueue_flush(vq, count); |
b796fcd1 | 297 | old = vq->used_idx; |
bcbabae8 MT |
298 | new = old + count; |
299 | vring_used_idx_set(vq, new); | |
967f97fa | 300 | vq->inuse -= count; |
bcbabae8 MT |
301 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) |
302 | vq->signalled_used_valid = false; | |
967f97fa AL |
303 | } |
304 | ||
305 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, | |
306 | unsigned int len) | |
307 | { | |
308 | virtqueue_fill(vq, elem, len, 0); | |
309 | virtqueue_flush(vq, 1); | |
310 | } | |
311 | ||
312 | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) | |
313 | { | |
314 | uint16_t num_heads = vring_avail_idx(vq) - idx; | |
315 | ||
316 | /* Check it isn't doing very strange things with descriptor numbers. */ | |
bb6834cf | 317 | if (num_heads > vq->vring.num) { |
ce67ed65 | 318 | error_report("Guest moved used index from %u to %u", |
be1fea9b | 319 | idx, vq->shadow_avail_idx); |
bb6834cf AL |
320 | exit(1); |
321 | } | |
a821ce59 MT |
322 | /* On success, callers read a descriptor at vq->last_avail_idx. |
323 | * Make sure descriptor read does not bypass avail index read. */ | |
324 | if (num_heads) { | |
325 | smp_rmb(); | |
326 | } | |
967f97fa AL |
327 | |
328 | return num_heads; | |
329 | } | |
330 | ||
331 | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) | |
332 | { | |
333 | unsigned int head; | |
334 | ||
335 | /* Grab the next descriptor number they're advertising, and increment | |
336 | * the index we've seen. */ | |
337 | head = vring_avail_ring(vq, idx % vq->vring.num); | |
338 | ||
339 | /* If their number is silly, that's a fatal mistake. */ | |
bb6834cf | 340 | if (head >= vq->vring.num) { |
ce67ed65 | 341 | error_report("Guest says index %u is available", head); |
bb6834cf AL |
342 | exit(1); |
343 | } | |
967f97fa AL |
344 | |
345 | return head; | |
346 | } | |
347 | ||
aa570d6f PB |
348 | static unsigned virtqueue_read_next_desc(VirtIODevice *vdev, VRingDesc *desc, |
349 | hwaddr desc_pa, unsigned int max) | |
967f97fa AL |
350 | { |
351 | unsigned int next; | |
352 | ||
353 | /* If this descriptor says it doesn't chain, we're done. */ | |
aa570d6f | 354 | if (!(desc->flags & VRING_DESC_F_NEXT)) { |
5774cf98 | 355 | return max; |
cee3ca00 | 356 | } |
967f97fa AL |
357 | |
358 | /* Check they're not leading us off end of descriptors. */ | |
aa570d6f | 359 | next = desc->next; |
967f97fa | 360 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
b90d2f35 | 361 | smp_wmb(); |
967f97fa | 362 | |
5774cf98 | 363 | if (next >= max) { |
ce67ed65 | 364 | error_report("Desc next is %u", next); |
bb6834cf AL |
365 | exit(1); |
366 | } | |
967f97fa | 367 | |
aa570d6f | 368 | vring_desc_read(vdev, desc, desc_pa, next); |
967f97fa AL |
369 | return next; |
370 | } | |
371 | ||
0d8d7690 | 372 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, |
e1f7b481 MT |
373 | unsigned int *out_bytes, |
374 | unsigned max_in_bytes, unsigned max_out_bytes) | |
967f97fa | 375 | { |
efeea6d0 | 376 | unsigned int idx; |
385ce95d | 377 | unsigned int total_bufs, in_total, out_total; |
967f97fa AL |
378 | |
379 | idx = vq->last_avail_idx; | |
380 | ||
efeea6d0 | 381 | total_bufs = in_total = out_total = 0; |
967f97fa | 382 | while (virtqueue_num_heads(vq, idx)) { |
cee3ca00 | 383 | VirtIODevice *vdev = vq->vdev; |
efeea6d0 | 384 | unsigned int max, num_bufs, indirect = 0; |
aa570d6f | 385 | VRingDesc desc; |
a8170e5e | 386 | hwaddr desc_pa; |
967f97fa AL |
387 | int i; |
388 | ||
efeea6d0 MM |
389 | max = vq->vring.num; |
390 | num_bufs = total_bufs; | |
967f97fa | 391 | i = virtqueue_get_head(vq, idx++); |
efeea6d0 | 392 | desc_pa = vq->vring.desc; |
aa570d6f | 393 | vring_desc_read(vdev, &desc, desc_pa, i); |
efeea6d0 | 394 | |
aa570d6f PB |
395 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
396 | if (desc.len % sizeof(VRingDesc)) { | |
ce67ed65 | 397 | error_report("Invalid size for indirect buffer table"); |
efeea6d0 MM |
398 | exit(1); |
399 | } | |
400 | ||
401 | /* If we've got too many, that implies a descriptor loop. */ | |
402 | if (num_bufs >= max) { | |
ce67ed65 | 403 | error_report("Looped descriptor"); |
efeea6d0 MM |
404 | exit(1); |
405 | } | |
406 | ||
407 | /* loop over the indirect descriptor table */ | |
408 | indirect = 1; | |
aa570d6f PB |
409 | max = desc.len / sizeof(VRingDesc); |
410 | desc_pa = desc.addr; | |
1ae2757c | 411 | num_bufs = i = 0; |
aa570d6f | 412 | vring_desc_read(vdev, &desc, desc_pa, i); |
efeea6d0 MM |
413 | } |
414 | ||
967f97fa AL |
415 | do { |
416 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 417 | if (++num_bufs > max) { |
ce67ed65 | 418 | error_report("Looped descriptor"); |
bb6834cf AL |
419 | exit(1); |
420 | } | |
967f97fa | 421 | |
aa570d6f PB |
422 | if (desc.flags & VRING_DESC_F_WRITE) { |
423 | in_total += desc.len; | |
967f97fa | 424 | } else { |
aa570d6f | 425 | out_total += desc.len; |
967f97fa | 426 | } |
e1f7b481 MT |
427 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
428 | goto done; | |
429 | } | |
aa570d6f | 430 | } while ((i = virtqueue_read_next_desc(vdev, &desc, desc_pa, max)) != max); |
efeea6d0 MM |
431 | |
432 | if (!indirect) | |
433 | total_bufs = num_bufs; | |
434 | else | |
435 | total_bufs++; | |
967f97fa | 436 | } |
e1f7b481 | 437 | done: |
0d8d7690 AS |
438 | if (in_bytes) { |
439 | *in_bytes = in_total; | |
440 | } | |
441 | if (out_bytes) { | |
442 | *out_bytes = out_total; | |
443 | } | |
444 | } | |
967f97fa | 445 | |
0d8d7690 AS |
446 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
447 | unsigned int out_bytes) | |
448 | { | |
449 | unsigned int in_total, out_total; | |
450 | ||
e1f7b481 MT |
451 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); |
452 | return in_bytes <= in_total && out_bytes <= out_total; | |
967f97fa AL |
453 | } |
454 | ||
3b3b0628 PB |
455 | static void virtqueue_map_desc(unsigned int *p_num_sg, hwaddr *addr, struct iovec *iov, |
456 | unsigned int max_num_sg, bool is_write, | |
457 | hwaddr pa, size_t sz) | |
458 | { | |
459 | unsigned num_sg = *p_num_sg; | |
460 | assert(num_sg <= max_num_sg); | |
461 | ||
1e7aed70 PP |
462 | if (!sz) { |
463 | error_report("virtio: zero sized buffers are not allowed"); | |
464 | exit(1); | |
465 | } | |
466 | ||
3b3b0628 PB |
467 | while (sz) { |
468 | hwaddr len = sz; | |
469 | ||
470 | if (num_sg == max_num_sg) { | |
471 | error_report("virtio: too many write descriptors in indirect table"); | |
472 | exit(1); | |
473 | } | |
474 | ||
475 | iov[num_sg].iov_base = cpu_physical_memory_map(pa, &len, is_write); | |
476 | iov[num_sg].iov_len = len; | |
477 | addr[num_sg] = pa; | |
478 | ||
479 | sz -= len; | |
480 | pa += len; | |
481 | num_sg++; | |
482 | } | |
483 | *p_num_sg = num_sg; | |
484 | } | |
485 | ||
8059feee MT |
486 | static void virtqueue_map_iovec(struct iovec *sg, hwaddr *addr, |
487 | unsigned int *num_sg, unsigned int max_size, | |
488 | int is_write) | |
42fb2e07 KW |
489 | { |
490 | unsigned int i; | |
a8170e5e | 491 | hwaddr len; |
42fb2e07 | 492 | |
8059feee MT |
493 | /* Note: this function MUST validate input, some callers |
494 | * are passing in num_sg values received over the network. | |
495 | */ | |
496 | /* TODO: teach all callers that this can fail, and return failure instead | |
497 | * of asserting here. | |
498 | * When we do, we might be able to re-enable NDEBUG below. | |
499 | */ | |
500 | #ifdef NDEBUG | |
501 | #error building with NDEBUG is not supported | |
502 | #endif | |
503 | assert(*num_sg <= max_size); | |
504 | ||
505 | for (i = 0; i < *num_sg; i++) { | |
42fb2e07 KW |
506 | len = sg[i].iov_len; |
507 | sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); | |
8059feee | 508 | if (!sg[i].iov_base) { |
1a285899 | 509 | error_report("virtio: error trying to map MMIO memory"); |
42fb2e07 KW |
510 | exit(1); |
511 | } | |
3b3b0628 PB |
512 | if (len != sg[i].iov_len) { |
513 | error_report("virtio: unexpected memory split"); | |
8059feee MT |
514 | exit(1); |
515 | } | |
42fb2e07 KW |
516 | } |
517 | } | |
518 | ||
8059feee MT |
519 | void virtqueue_map(VirtQueueElement *elem) |
520 | { | |
521 | virtqueue_map_iovec(elem->in_sg, elem->in_addr, &elem->in_num, | |
3724650d | 522 | VIRTQUEUE_MAX_SIZE, 1); |
8059feee | 523 | virtqueue_map_iovec(elem->out_sg, elem->out_addr, &elem->out_num, |
3724650d PB |
524 | VIRTQUEUE_MAX_SIZE, 0); |
525 | } | |
526 | ||
527 | void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num) | |
528 | { | |
529 | VirtQueueElement *elem; | |
530 | size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0])); | |
531 | size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]); | |
532 | size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]); | |
533 | size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0])); | |
534 | size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); | |
535 | size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); | |
536 | ||
537 | assert(sz >= sizeof(VirtQueueElement)); | |
538 | elem = g_malloc(out_sg_end); | |
539 | elem->out_num = out_num; | |
540 | elem->in_num = in_num; | |
541 | elem->in_addr = (void *)elem + in_addr_ofs; | |
542 | elem->out_addr = (void *)elem + out_addr_ofs; | |
543 | elem->in_sg = (void *)elem + in_sg_ofs; | |
544 | elem->out_sg = (void *)elem + out_sg_ofs; | |
545 | return elem; | |
8059feee MT |
546 | } |
547 | ||
51b19ebe | 548 | void *virtqueue_pop(VirtQueue *vq, size_t sz) |
967f97fa | 549 | { |
5774cf98 | 550 | unsigned int i, head, max; |
a8170e5e | 551 | hwaddr desc_pa = vq->vring.desc; |
cee3ca00 | 552 | VirtIODevice *vdev = vq->vdev; |
51b19ebe | 553 | VirtQueueElement *elem; |
3b3b0628 PB |
554 | unsigned out_num, in_num; |
555 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; | |
556 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
aa570d6f | 557 | VRingDesc desc; |
967f97fa | 558 | |
be1fea9b | 559 | if (virtio_queue_empty(vq)) { |
51b19ebe PB |
560 | return NULL; |
561 | } | |
be1fea9b VM |
562 | /* Needed after virtio_queue_empty(), see comment in |
563 | * virtqueue_num_heads(). */ | |
564 | smp_rmb(); | |
967f97fa AL |
565 | |
566 | /* When we start there are none of either input nor output. */ | |
3b3b0628 | 567 | out_num = in_num = 0; |
967f97fa | 568 | |
5774cf98 MM |
569 | max = vq->vring.num; |
570 | ||
afd9096e SH |
571 | if (vq->inuse >= vq->vring.num) { |
572 | error_report("Virtqueue size exceeded"); | |
573 | exit(1); | |
574 | } | |
575 | ||
967f97fa | 576 | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
95129d6f | 577 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 578 | vring_set_avail_event(vq, vq->last_avail_idx); |
bcbabae8 | 579 | } |
efeea6d0 | 580 | |
aa570d6f PB |
581 | vring_desc_read(vdev, &desc, desc_pa, i); |
582 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
583 | if (desc.len % sizeof(VRingDesc)) { | |
ce67ed65 | 584 | error_report("Invalid size for indirect buffer table"); |
efeea6d0 MM |
585 | exit(1); |
586 | } | |
587 | ||
588 | /* loop over the indirect descriptor table */ | |
aa570d6f PB |
589 | max = desc.len / sizeof(VRingDesc); |
590 | desc_pa = desc.addr; | |
efeea6d0 | 591 | i = 0; |
aa570d6f | 592 | vring_desc_read(vdev, &desc, desc_pa, i); |
efeea6d0 MM |
593 | } |
594 | ||
42fb2e07 | 595 | /* Collect all the descriptors */ |
967f97fa | 596 | do { |
aa570d6f | 597 | if (desc.flags & VRING_DESC_F_WRITE) { |
3b3b0628 | 598 | virtqueue_map_desc(&in_num, addr + out_num, iov + out_num, |
aa570d6f | 599 | VIRTQUEUE_MAX_SIZE - out_num, true, desc.addr, desc.len); |
42fb2e07 | 600 | } else { |
3b3b0628 PB |
601 | if (in_num) { |
602 | error_report("Incorrect order for descriptors"); | |
c8eac1cf MT |
603 | exit(1); |
604 | } | |
3b3b0628 | 605 | virtqueue_map_desc(&out_num, addr, iov, |
aa570d6f | 606 | VIRTQUEUE_MAX_SIZE, false, desc.addr, desc.len); |
42fb2e07 | 607 | } |
967f97fa | 608 | |
967f97fa | 609 | /* If we've got too many, that implies a descriptor loop. */ |
3b3b0628 | 610 | if ((in_num + out_num) > max) { |
ce67ed65 | 611 | error_report("Looped descriptor"); |
bb6834cf AL |
612 | exit(1); |
613 | } | |
aa570d6f | 614 | } while ((i = virtqueue_read_next_desc(vdev, &desc, desc_pa, max)) != max); |
967f97fa | 615 | |
3b3b0628 PB |
616 | /* Now copy what we have collected and mapped */ |
617 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
967f97fa | 618 | elem->index = head; |
3b3b0628 PB |
619 | for (i = 0; i < out_num; i++) { |
620 | elem->out_addr[i] = addr[i]; | |
621 | elem->out_sg[i] = iov[i]; | |
622 | } | |
623 | for (i = 0; i < in_num; i++) { | |
624 | elem->in_addr[i] = addr[out_num + i]; | |
625 | elem->in_sg[i] = iov[out_num + i]; | |
626 | } | |
967f97fa AL |
627 | |
628 | vq->inuse++; | |
629 | ||
64979a4d | 630 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
51b19ebe | 631 | return elem; |
967f97fa AL |
632 | } |
633 | ||
3724650d PB |
634 | /* Reading and writing a structure directly to QEMUFile is *awful*, but |
635 | * it is what QEMU has always done by mistake. We can change it sooner | |
636 | * or later by bumping the version number of the affected vm states. | |
637 | * In the meanwhile, since the in-memory layout of VirtQueueElement | |
638 | * has changed, we need to marshal to and from the layout that was | |
639 | * used before the change. | |
640 | */ | |
641 | typedef struct VirtQueueElementOld { | |
642 | unsigned int index; | |
643 | unsigned int out_num; | |
644 | unsigned int in_num; | |
645 | hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; | |
646 | hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; | |
647 | struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; | |
648 | struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; | |
649 | } VirtQueueElementOld; | |
650 | ||
ab281c17 PB |
651 | void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz) |
652 | { | |
3724650d PB |
653 | VirtQueueElement *elem; |
654 | VirtQueueElementOld data; | |
655 | int i; | |
656 | ||
657 | qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
658 | ||
659 | elem = virtqueue_alloc_element(sz, data.out_num, data.in_num); | |
660 | elem->index = data.index; | |
661 | ||
662 | for (i = 0; i < elem->in_num; i++) { | |
663 | elem->in_addr[i] = data.in_addr[i]; | |
664 | } | |
665 | ||
666 | for (i = 0; i < elem->out_num; i++) { | |
667 | elem->out_addr[i] = data.out_addr[i]; | |
668 | } | |
669 | ||
670 | for (i = 0; i < elem->in_num; i++) { | |
671 | /* Base is overwritten by virtqueue_map. */ | |
672 | elem->in_sg[i].iov_base = 0; | |
673 | elem->in_sg[i].iov_len = data.in_sg[i].iov_len; | |
674 | } | |
675 | ||
676 | for (i = 0; i < elem->out_num; i++) { | |
677 | /* Base is overwritten by virtqueue_map. */ | |
678 | elem->out_sg[i].iov_base = 0; | |
679 | elem->out_sg[i].iov_len = data.out_sg[i].iov_len; | |
680 | } | |
681 | ||
ab281c17 PB |
682 | virtqueue_map(elem); |
683 | return elem; | |
684 | } | |
685 | ||
686 | void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem) | |
687 | { | |
3724650d PB |
688 | VirtQueueElementOld data; |
689 | int i; | |
690 | ||
691 | memset(&data, 0, sizeof(data)); | |
692 | data.index = elem->index; | |
693 | data.in_num = elem->in_num; | |
694 | data.out_num = elem->out_num; | |
695 | ||
696 | for (i = 0; i < elem->in_num; i++) { | |
697 | data.in_addr[i] = elem->in_addr[i]; | |
698 | } | |
699 | ||
700 | for (i = 0; i < elem->out_num; i++) { | |
701 | data.out_addr[i] = elem->out_addr[i]; | |
702 | } | |
703 | ||
704 | for (i = 0; i < elem->in_num; i++) { | |
705 | /* Base is overwritten by virtqueue_map when loading. Do not | |
706 | * save it, as it would leak the QEMU address space layout. */ | |
707 | data.in_sg[i].iov_len = elem->in_sg[i].iov_len; | |
708 | } | |
709 | ||
710 | for (i = 0; i < elem->out_num; i++) { | |
711 | /* Do not save iov_base as above. */ | |
712 | data.out_sg[i].iov_len = elem->out_sg[i].iov_len; | |
713 | } | |
714 | qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
ab281c17 PB |
715 | } |
716 | ||
967f97fa | 717 | /* virtio device */ |
7055e687 MT |
718 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
719 | { | |
1c819449 FK |
720 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
721 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
722 | ||
723 | if (k->notify) { | |
724 | k->notify(qbus->parent, vector); | |
7055e687 MT |
725 | } |
726 | } | |
967f97fa | 727 | |
53c25cea | 728 | void virtio_update_irq(VirtIODevice *vdev) |
967f97fa | 729 | { |
7055e687 | 730 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
967f97fa AL |
731 | } |
732 | ||
0b352fd6 CH |
733 | static int virtio_validate_features(VirtIODevice *vdev) |
734 | { | |
735 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
736 | ||
737 | if (k->validate_features) { | |
738 | return k->validate_features(vdev); | |
739 | } else { | |
740 | return 0; | |
741 | } | |
742 | } | |
743 | ||
744 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) | |
4e1837f8 | 745 | { |
181103cd | 746 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
4e1837f8 SH |
747 | trace_virtio_set_status(vdev, val); |
748 | ||
95129d6f | 749 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
0b352fd6 CH |
750 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && |
751 | val & VIRTIO_CONFIG_S_FEATURES_OK) { | |
752 | int ret = virtio_validate_features(vdev); | |
753 | ||
754 | if (ret) { | |
755 | return ret; | |
756 | } | |
757 | } | |
758 | } | |
181103cd FK |
759 | if (k->set_status) { |
760 | k->set_status(vdev, val); | |
4e1837f8 SH |
761 | } |
762 | vdev->status = val; | |
0b352fd6 | 763 | return 0; |
4e1837f8 SH |
764 | } |
765 | ||
616a6552 GK |
766 | bool target_words_bigendian(void); |
767 | static enum virtio_device_endian virtio_default_endian(void) | |
768 | { | |
769 | if (target_words_bigendian()) { | |
770 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
771 | } else { | |
772 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
773 | } | |
774 | } | |
775 | ||
776 | static enum virtio_device_endian virtio_current_cpu_endian(void) | |
777 | { | |
778 | CPUClass *cc = CPU_GET_CLASS(current_cpu); | |
779 | ||
780 | if (cc->virtio_is_big_endian(current_cpu)) { | |
781 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
782 | } else { | |
783 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
784 | } | |
785 | } | |
786 | ||
53c25cea | 787 | void virtio_reset(void *opaque) |
967f97fa AL |
788 | { |
789 | VirtIODevice *vdev = opaque; | |
181103cd | 790 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
791 | int i; |
792 | ||
e0c472d8 | 793 | virtio_set_status(vdev, 0); |
616a6552 GK |
794 | if (current_cpu) { |
795 | /* Guest initiated reset */ | |
796 | vdev->device_endian = virtio_current_cpu_endian(); | |
797 | } else { | |
798 | /* System reset */ | |
799 | vdev->device_endian = virtio_default_endian(); | |
800 | } | |
e0c472d8 | 801 | |
181103cd FK |
802 | if (k->reset) { |
803 | k->reset(vdev); | |
804 | } | |
967f97fa | 805 | |
704a76fc | 806 | vdev->guest_features = 0; |
967f97fa AL |
807 | vdev->queue_sel = 0; |
808 | vdev->status = 0; | |
809 | vdev->isr = 0; | |
7055e687 MT |
810 | vdev->config_vector = VIRTIO_NO_VECTOR; |
811 | virtio_notify_vector(vdev, vdev->config_vector); | |
967f97fa | 812 | |
87b3bd1c | 813 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
814 | vdev->vq[i].vring.desc = 0; |
815 | vdev->vq[i].vring.avail = 0; | |
816 | vdev->vq[i].vring.used = 0; | |
817 | vdev->vq[i].last_avail_idx = 0; | |
be1fea9b | 818 | vdev->vq[i].shadow_avail_idx = 0; |
b796fcd1 | 819 | vdev->vq[i].used_idx = 0; |
e0d686bf | 820 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); |
bcbabae8 MT |
821 | vdev->vq[i].signalled_used = 0; |
822 | vdev->vq[i].signalled_used_valid = false; | |
823 | vdev->vq[i].notification = true; | |
46c5d082 | 824 | vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; |
4b7f91ed | 825 | vdev->vq[i].inuse = 0; |
967f97fa AL |
826 | } |
827 | } | |
828 | ||
53c25cea | 829 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 830 | { |
181103cd | 831 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
832 | uint8_t val; |
833 | ||
5f5a1318 | 834 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 835 | return (uint32_t)-1; |
5f5a1318 JW |
836 | } |
837 | ||
838 | k->get_config(vdev, vdev->config); | |
967f97fa | 839 | |
06dbfc6f | 840 | val = ldub_p(vdev->config + addr); |
967f97fa AL |
841 | return val; |
842 | } | |
843 | ||
53c25cea | 844 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 845 | { |
181103cd | 846 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
847 | uint16_t val; |
848 | ||
5f5a1318 | 849 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 850 | return (uint32_t)-1; |
5f5a1318 JW |
851 | } |
852 | ||
853 | k->get_config(vdev, vdev->config); | |
967f97fa | 854 | |
06dbfc6f | 855 | val = lduw_p(vdev->config + addr); |
967f97fa AL |
856 | return val; |
857 | } | |
858 | ||
53c25cea | 859 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 860 | { |
181103cd | 861 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
862 | uint32_t val; |
863 | ||
5f5a1318 | 864 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 865 | return (uint32_t)-1; |
5f5a1318 JW |
866 | } |
867 | ||
868 | k->get_config(vdev, vdev->config); | |
967f97fa | 869 | |
06dbfc6f | 870 | val = ldl_p(vdev->config + addr); |
967f97fa AL |
871 | return val; |
872 | } | |
873 | ||
53c25cea | 874 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 875 | { |
181103cd | 876 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
877 | uint8_t val = data; |
878 | ||
5f5a1318 | 879 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 880 | return; |
5f5a1318 | 881 | } |
967f97fa | 882 | |
06dbfc6f | 883 | stb_p(vdev->config + addr, val); |
967f97fa | 884 | |
181103cd FK |
885 | if (k->set_config) { |
886 | k->set_config(vdev, vdev->config); | |
887 | } | |
967f97fa AL |
888 | } |
889 | ||
53c25cea | 890 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 891 | { |
181103cd | 892 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
893 | uint16_t val = data; |
894 | ||
5f5a1318 | 895 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 896 | return; |
5f5a1318 | 897 | } |
967f97fa | 898 | |
06dbfc6f | 899 | stw_p(vdev->config + addr, val); |
967f97fa | 900 | |
181103cd FK |
901 | if (k->set_config) { |
902 | k->set_config(vdev, vdev->config); | |
903 | } | |
967f97fa AL |
904 | } |
905 | ||
53c25cea | 906 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 907 | { |
181103cd | 908 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
909 | uint32_t val = data; |
910 | ||
5f5a1318 | 911 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 912 | return; |
5f5a1318 | 913 | } |
967f97fa | 914 | |
06dbfc6f | 915 | stl_p(vdev->config + addr, val); |
967f97fa | 916 | |
181103cd FK |
917 | if (k->set_config) { |
918 | k->set_config(vdev, vdev->config); | |
919 | } | |
967f97fa AL |
920 | } |
921 | ||
adfb743c MT |
922 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr) |
923 | { | |
924 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
925 | uint8_t val; | |
926 | ||
927 | if (addr + sizeof(val) > vdev->config_len) { | |
928 | return (uint32_t)-1; | |
929 | } | |
930 | ||
931 | k->get_config(vdev, vdev->config); | |
932 | ||
933 | val = ldub_p(vdev->config + addr); | |
934 | return val; | |
935 | } | |
936 | ||
937 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr) | |
938 | { | |
939 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
940 | uint16_t val; | |
941 | ||
942 | if (addr + sizeof(val) > vdev->config_len) { | |
943 | return (uint32_t)-1; | |
944 | } | |
945 | ||
946 | k->get_config(vdev, vdev->config); | |
947 | ||
948 | val = lduw_le_p(vdev->config + addr); | |
949 | return val; | |
950 | } | |
951 | ||
952 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr) | |
953 | { | |
954 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
955 | uint32_t val; | |
956 | ||
957 | if (addr + sizeof(val) > vdev->config_len) { | |
958 | return (uint32_t)-1; | |
959 | } | |
960 | ||
961 | k->get_config(vdev, vdev->config); | |
962 | ||
963 | val = ldl_le_p(vdev->config + addr); | |
964 | return val; | |
965 | } | |
966 | ||
967 | void virtio_config_modern_writeb(VirtIODevice *vdev, | |
968 | uint32_t addr, uint32_t data) | |
969 | { | |
970 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
971 | uint8_t val = data; | |
972 | ||
973 | if (addr + sizeof(val) > vdev->config_len) { | |
974 | return; | |
975 | } | |
976 | ||
977 | stb_p(vdev->config + addr, val); | |
978 | ||
979 | if (k->set_config) { | |
980 | k->set_config(vdev, vdev->config); | |
981 | } | |
982 | } | |
983 | ||
984 | void virtio_config_modern_writew(VirtIODevice *vdev, | |
985 | uint32_t addr, uint32_t data) | |
986 | { | |
987 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
988 | uint16_t val = data; | |
989 | ||
990 | if (addr + sizeof(val) > vdev->config_len) { | |
991 | return; | |
992 | } | |
993 | ||
994 | stw_le_p(vdev->config + addr, val); | |
995 | ||
996 | if (k->set_config) { | |
997 | k->set_config(vdev, vdev->config); | |
998 | } | |
999 | } | |
1000 | ||
1001 | void virtio_config_modern_writel(VirtIODevice *vdev, | |
1002 | uint32_t addr, uint32_t data) | |
1003 | { | |
1004 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
1005 | uint32_t val = data; | |
1006 | ||
1007 | if (addr + sizeof(val) > vdev->config_len) { | |
1008 | return; | |
1009 | } | |
1010 | ||
1011 | stl_le_p(vdev->config + addr, val); | |
1012 | ||
1013 | if (k->set_config) { | |
1014 | k->set_config(vdev, vdev->config); | |
1015 | } | |
1016 | } | |
1017 | ||
a8170e5e | 1018 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) |
967f97fa | 1019 | { |
ab223c95 CH |
1020 | vdev->vq[n].vring.desc = addr; |
1021 | virtio_queue_update_rings(vdev, n); | |
53c25cea PB |
1022 | } |
1023 | ||
a8170e5e | 1024 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) |
53c25cea | 1025 | { |
ab223c95 CH |
1026 | return vdev->vq[n].vring.desc; |
1027 | } | |
1028 | ||
1029 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, | |
1030 | hwaddr avail, hwaddr used) | |
1031 | { | |
1032 | vdev->vq[n].vring.desc = desc; | |
1033 | vdev->vq[n].vring.avail = avail; | |
1034 | vdev->vq[n].vring.used = used; | |
53c25cea PB |
1035 | } |
1036 | ||
e63c0ba1 PM |
1037 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) |
1038 | { | |
f6049f44 PM |
1039 | /* Don't allow guest to flip queue between existent and |
1040 | * nonexistent states, or to set it to an invalid size. | |
1041 | */ | |
1042 | if (!!num != !!vdev->vq[n].vring.num || | |
1043 | num > VIRTQUEUE_MAX_SIZE || | |
1044 | num < 0) { | |
1045 | return; | |
e63c0ba1 | 1046 | } |
f6049f44 | 1047 | vdev->vq[n].vring.num = num; |
e63c0ba1 PM |
1048 | } |
1049 | ||
e0d686bf JW |
1050 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) |
1051 | { | |
1052 | return QLIST_FIRST(&vdev->vector_queues[vector]); | |
1053 | } | |
1054 | ||
1055 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) | |
1056 | { | |
1057 | return QLIST_NEXT(vq, node); | |
1058 | } | |
1059 | ||
53c25cea PB |
1060 | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
1061 | { | |
1062 | return vdev->vq[n].vring.num; | |
1063 | } | |
967f97fa | 1064 | |
8ad176aa JW |
1065 | int virtio_get_num_queues(VirtIODevice *vdev) |
1066 | { | |
1067 | int i; | |
1068 | ||
87b3bd1c | 1069 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
8ad176aa JW |
1070 | if (!virtio_queue_get_num(vdev, i)) { |
1071 | break; | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | return i; | |
1076 | } | |
1077 | ||
6ce69d1c PM |
1078 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) |
1079 | { | |
1080 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1081 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1082 | ||
ab223c95 | 1083 | /* virtio-1 compliant devices cannot change the alignment */ |
95129d6f | 1084 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
ab223c95 CH |
1085 | error_report("tried to modify queue alignment for virtio-1 device"); |
1086 | return; | |
1087 | } | |
6ce69d1c PM |
1088 | /* Check that the transport told us it was going to do this |
1089 | * (so a buggy transport will immediately assert rather than | |
1090 | * silently failing to migrate this state) | |
1091 | */ | |
1092 | assert(k->has_variable_vring_alignment); | |
1093 | ||
1094 | vdev->vq[n].vring.align = align; | |
ab223c95 | 1095 | virtio_queue_update_rings(vdev, n); |
6ce69d1c PM |
1096 | } |
1097 | ||
344dc16f MT |
1098 | static void virtio_queue_notify_aio_vq(VirtQueue *vq) |
1099 | { | |
1100 | if (vq->vring.desc && vq->handle_aio_output) { | |
1101 | VirtIODevice *vdev = vq->vdev; | |
1102 | ||
1103 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
1104 | vq->handle_aio_output(vdev, vq); | |
1105 | } | |
1106 | } | |
1107 | ||
2b2cbcad | 1108 | static void virtio_queue_notify_vq(VirtQueue *vq) |
25db9ebe | 1109 | { |
9e0f5b81 | 1110 | if (vq->vring.desc && vq->handle_output) { |
25db9ebe | 1111 | VirtIODevice *vdev = vq->vdev; |
9e0f5b81 | 1112 | |
25db9ebe SH |
1113 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
1114 | vq->handle_output(vdev, vq); | |
1115 | } | |
1116 | } | |
1117 | ||
53c25cea PB |
1118 | void virtio_queue_notify(VirtIODevice *vdev, int n) |
1119 | { | |
7157e2e2 | 1120 | virtio_queue_notify_vq(&vdev->vq[n]); |
967f97fa AL |
1121 | } |
1122 | ||
7055e687 MT |
1123 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) |
1124 | { | |
87b3bd1c | 1125 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : |
7055e687 MT |
1126 | VIRTIO_NO_VECTOR; |
1127 | } | |
1128 | ||
1129 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) | |
1130 | { | |
e0d686bf JW |
1131 | VirtQueue *vq = &vdev->vq[n]; |
1132 | ||
87b3bd1c | 1133 | if (n < VIRTIO_QUEUE_MAX) { |
e0d686bf JW |
1134 | if (vdev->vector_queues && |
1135 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { | |
1136 | QLIST_REMOVE(vq, node); | |
1137 | } | |
7055e687 | 1138 | vdev->vq[n].vector = vector; |
e0d686bf JW |
1139 | if (vdev->vector_queues && |
1140 | vector != VIRTIO_NO_VECTOR) { | |
1141 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); | |
1142 | } | |
1143 | } | |
7055e687 MT |
1144 | } |
1145 | ||
872dd82c FZ |
1146 | static VirtQueue *virtio_add_queue_internal(VirtIODevice *vdev, int queue_size, |
1147 | VirtIOHandleOutput handle_output, | |
1148 | bool use_aio) | |
967f97fa AL |
1149 | { |
1150 | int i; | |
1151 | ||
87b3bd1c | 1152 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1153 | if (vdev->vq[i].vring.num == 0) |
1154 | break; | |
1155 | } | |
1156 | ||
87b3bd1c | 1157 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) |
967f97fa AL |
1158 | abort(); |
1159 | ||
1160 | vdev->vq[i].vring.num = queue_size; | |
46c5d082 | 1161 | vdev->vq[i].vring.num_default = queue_size; |
6ce69d1c | 1162 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; |
967f97fa | 1163 | vdev->vq[i].handle_output = handle_output; |
344dc16f | 1164 | vdev->vq[i].handle_aio_output = NULL; |
872dd82c | 1165 | vdev->vq[i].use_aio = use_aio; |
967f97fa AL |
1166 | |
1167 | return &vdev->vq[i]; | |
1168 | } | |
1169 | ||
872dd82c FZ |
1170 | /* Add a virt queue and mark AIO. |
1171 | * An AIO queue will use the AioContext based event interface instead of the | |
1172 | * default IOHandler and EventNotifier interface. | |
1173 | */ | |
1174 | VirtQueue *virtio_add_queue_aio(VirtIODevice *vdev, int queue_size, | |
1175 | VirtIOHandleOutput handle_output) | |
1176 | { | |
1177 | return virtio_add_queue_internal(vdev, queue_size, handle_output, true); | |
1178 | } | |
1179 | ||
1180 | /* Add a normal virt queue (on the contrary to the AIO version above. */ | |
1181 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, | |
1182 | VirtIOHandleOutput handle_output) | |
1183 | { | |
1184 | return virtio_add_queue_internal(vdev, queue_size, handle_output, false); | |
1185 | } | |
1186 | ||
f23fd811 JW |
1187 | void virtio_del_queue(VirtIODevice *vdev, int n) |
1188 | { | |
87b3bd1c | 1189 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { |
f23fd811 JW |
1190 | abort(); |
1191 | } | |
1192 | ||
1193 | vdev->vq[n].vring.num = 0; | |
46c5d082 | 1194 | vdev->vq[n].vring.num_default = 0; |
f23fd811 JW |
1195 | } |
1196 | ||
1cbdabe2 MT |
1197 | void virtio_irq(VirtQueue *vq) |
1198 | { | |
64979a4d | 1199 | trace_virtio_irq(vq); |
1cbdabe2 MT |
1200 | vq->vdev->isr |= 0x01; |
1201 | virtio_notify_vector(vq->vdev, vq->vector); | |
1202 | } | |
1203 | ||
adb3feda | 1204 | bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
bcbabae8 MT |
1205 | { |
1206 | uint16_t old, new; | |
1207 | bool v; | |
a281ebc1 MT |
1208 | /* We need to expose used array entries before checking used event. */ |
1209 | smp_mb(); | |
97b83deb | 1210 | /* Always notify when queue is empty (when feature acknowledge) */ |
95129d6f | 1211 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && |
be1fea9b | 1212 | !vq->inuse && virtio_queue_empty(vq)) { |
bcbabae8 MT |
1213 | return true; |
1214 | } | |
1215 | ||
95129d6f | 1216 | if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
bcbabae8 MT |
1217 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); |
1218 | } | |
1219 | ||
1220 | v = vq->signalled_used_valid; | |
1221 | vq->signalled_used_valid = true; | |
1222 | old = vq->signalled_used; | |
b796fcd1 | 1223 | new = vq->signalled_used = vq->used_idx; |
e9600c6c | 1224 | return !v || vring_need_event(vring_get_used_event(vq), new, old); |
bcbabae8 MT |
1225 | } |
1226 | ||
1227 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) | |
1228 | { | |
adb3feda | 1229 | if (!virtio_should_notify(vdev, vq)) { |
967f97fa | 1230 | return; |
bcbabae8 | 1231 | } |
967f97fa | 1232 | |
64979a4d | 1233 | trace_virtio_notify(vdev, vq); |
967f97fa | 1234 | vdev->isr |= 0x01; |
7055e687 | 1235 | virtio_notify_vector(vdev, vq->vector); |
967f97fa AL |
1236 | } |
1237 | ||
1238 | void virtio_notify_config(VirtIODevice *vdev) | |
1239 | { | |
7625162c AL |
1240 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) |
1241 | return; | |
1242 | ||
967f97fa | 1243 | vdev->isr |= 0x03; |
b8f05908 | 1244 | vdev->generation++; |
7055e687 | 1245 | virtio_notify_vector(vdev, vdev->config_vector); |
967f97fa AL |
1246 | } |
1247 | ||
616a6552 GK |
1248 | static bool virtio_device_endian_needed(void *opaque) |
1249 | { | |
1250 | VirtIODevice *vdev = opaque; | |
1251 | ||
1252 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); | |
95129d6f | 1253 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
3c185597 CH |
1254 | return vdev->device_endian != virtio_default_endian(); |
1255 | } | |
1256 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
1257 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; | |
616a6552 GK |
1258 | } |
1259 | ||
019a3edb GH |
1260 | static bool virtio_64bit_features_needed(void *opaque) |
1261 | { | |
1262 | VirtIODevice *vdev = opaque; | |
1263 | ||
1264 | return (vdev->host_features >> 32) != 0; | |
1265 | } | |
1266 | ||
74aae7b2 JW |
1267 | static bool virtio_virtqueue_needed(void *opaque) |
1268 | { | |
1269 | VirtIODevice *vdev = opaque; | |
1270 | ||
1271 | return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1); | |
1272 | } | |
1273 | ||
46c5d082 CH |
1274 | static bool virtio_ringsize_needed(void *opaque) |
1275 | { | |
1276 | VirtIODevice *vdev = opaque; | |
1277 | int i; | |
1278 | ||
1279 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1280 | if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) { | |
1281 | return true; | |
1282 | } | |
1283 | } | |
1284 | return false; | |
1285 | } | |
1286 | ||
a6df8adf JW |
1287 | static bool virtio_extra_state_needed(void *opaque) |
1288 | { | |
1289 | VirtIODevice *vdev = opaque; | |
1290 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1291 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1292 | ||
1293 | return k->has_extra_state && | |
1294 | k->has_extra_state(qbus->parent); | |
1295 | } | |
1296 | ||
50e5ae4d | 1297 | static const VMStateDescription vmstate_virtqueue = { |
74aae7b2 | 1298 | .name = "virtqueue_state", |
50e5ae4d DDAG |
1299 | .version_id = 1, |
1300 | .minimum_version_id = 1, | |
1301 | .fields = (VMStateField[]) { | |
1302 | VMSTATE_UINT64(vring.avail, struct VirtQueue), | |
1303 | VMSTATE_UINT64(vring.used, struct VirtQueue), | |
1304 | VMSTATE_END_OF_LIST() | |
1305 | } | |
74aae7b2 JW |
1306 | }; |
1307 | ||
1308 | static const VMStateDescription vmstate_virtio_virtqueues = { | |
1309 | .name = "virtio/virtqueues", | |
1310 | .version_id = 1, | |
1311 | .minimum_version_id = 1, | |
1312 | .needed = &virtio_virtqueue_needed, | |
1313 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
1314 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
1315 | VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue), | |
74aae7b2 JW |
1316 | VMSTATE_END_OF_LIST() |
1317 | } | |
1318 | }; | |
1319 | ||
50e5ae4d | 1320 | static const VMStateDescription vmstate_ringsize = { |
46c5d082 | 1321 | .name = "ringsize_state", |
50e5ae4d DDAG |
1322 | .version_id = 1, |
1323 | .minimum_version_id = 1, | |
1324 | .fields = (VMStateField[]) { | |
1325 | VMSTATE_UINT32(vring.num_default, struct VirtQueue), | |
1326 | VMSTATE_END_OF_LIST() | |
1327 | } | |
46c5d082 CH |
1328 | }; |
1329 | ||
1330 | static const VMStateDescription vmstate_virtio_ringsize = { | |
1331 | .name = "virtio/ringsize", | |
1332 | .version_id = 1, | |
1333 | .minimum_version_id = 1, | |
1334 | .needed = &virtio_ringsize_needed, | |
1335 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
1336 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
1337 | VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue), | |
46c5d082 CH |
1338 | VMSTATE_END_OF_LIST() |
1339 | } | |
1340 | }; | |
1341 | ||
a6df8adf JW |
1342 | static int get_extra_state(QEMUFile *f, void *pv, size_t size) |
1343 | { | |
1344 | VirtIODevice *vdev = pv; | |
1345 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1346 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1347 | ||
1348 | if (!k->load_extra_state) { | |
1349 | return -1; | |
1350 | } else { | |
1351 | return k->load_extra_state(qbus->parent, f); | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | static void put_extra_state(QEMUFile *f, void *pv, size_t size) | |
1356 | { | |
1357 | VirtIODevice *vdev = pv; | |
1358 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1359 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1360 | ||
1361 | k->save_extra_state(qbus->parent, f); | |
1362 | } | |
1363 | ||
1364 | static const VMStateInfo vmstate_info_extra_state = { | |
1365 | .name = "virtqueue_extra_state", | |
1366 | .get = get_extra_state, | |
1367 | .put = put_extra_state, | |
1368 | }; | |
1369 | ||
1370 | static const VMStateDescription vmstate_virtio_extra_state = { | |
1371 | .name = "virtio/extra_state", | |
1372 | .version_id = 1, | |
1373 | .minimum_version_id = 1, | |
1374 | .needed = &virtio_extra_state_needed, | |
1375 | .fields = (VMStateField[]) { | |
1376 | { | |
1377 | .name = "extra_state", | |
1378 | .version_id = 0, | |
1379 | .field_exists = NULL, | |
1380 | .size = 0, | |
1381 | .info = &vmstate_info_extra_state, | |
1382 | .flags = VMS_SINGLE, | |
1383 | .offset = 0, | |
1384 | }, | |
1385 | VMSTATE_END_OF_LIST() | |
1386 | } | |
1387 | }; | |
1388 | ||
616a6552 GK |
1389 | static const VMStateDescription vmstate_virtio_device_endian = { |
1390 | .name = "virtio/device_endian", | |
1391 | .version_id = 1, | |
1392 | .minimum_version_id = 1, | |
5cd8cada | 1393 | .needed = &virtio_device_endian_needed, |
616a6552 GK |
1394 | .fields = (VMStateField[]) { |
1395 | VMSTATE_UINT8(device_endian, VirtIODevice), | |
1396 | VMSTATE_END_OF_LIST() | |
1397 | } | |
1398 | }; | |
1399 | ||
019a3edb GH |
1400 | static const VMStateDescription vmstate_virtio_64bit_features = { |
1401 | .name = "virtio/64bit_features", | |
1402 | .version_id = 1, | |
1403 | .minimum_version_id = 1, | |
5cd8cada | 1404 | .needed = &virtio_64bit_features_needed, |
019a3edb GH |
1405 | .fields = (VMStateField[]) { |
1406 | VMSTATE_UINT64(guest_features, VirtIODevice), | |
1407 | VMSTATE_END_OF_LIST() | |
1408 | } | |
1409 | }; | |
1410 | ||
6b321a3d GK |
1411 | static const VMStateDescription vmstate_virtio = { |
1412 | .name = "virtio", | |
1413 | .version_id = 1, | |
1414 | .minimum_version_id = 1, | |
1415 | .minimum_version_id_old = 1, | |
1416 | .fields = (VMStateField[]) { | |
1417 | VMSTATE_END_OF_LIST() | |
616a6552 | 1418 | }, |
5cd8cada JQ |
1419 | .subsections = (const VMStateDescription*[]) { |
1420 | &vmstate_virtio_device_endian, | |
1421 | &vmstate_virtio_64bit_features, | |
74aae7b2 | 1422 | &vmstate_virtio_virtqueues, |
46c5d082 | 1423 | &vmstate_virtio_ringsize, |
a6df8adf | 1424 | &vmstate_virtio_extra_state, |
5cd8cada | 1425 | NULL |
6b321a3d GK |
1426 | } |
1427 | }; | |
1428 | ||
967f97fa AL |
1429 | void virtio_save(VirtIODevice *vdev, QEMUFile *f) |
1430 | { | |
1c819449 FK |
1431 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1432 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 1433 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
019a3edb | 1434 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); |
967f97fa AL |
1435 | int i; |
1436 | ||
1c819449 FK |
1437 | if (k->save_config) { |
1438 | k->save_config(qbus->parent, f); | |
1439 | } | |
967f97fa | 1440 | |
967f97fa AL |
1441 | qemu_put_8s(f, &vdev->status); |
1442 | qemu_put_8s(f, &vdev->isr); | |
1443 | qemu_put_be16s(f, &vdev->queue_sel); | |
019a3edb | 1444 | qemu_put_be32s(f, &guest_features_lo); |
967f97fa AL |
1445 | qemu_put_be32(f, vdev->config_len); |
1446 | qemu_put_buffer(f, vdev->config, vdev->config_len); | |
1447 | ||
87b3bd1c | 1448 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1449 | if (vdev->vq[i].vring.num == 0) |
1450 | break; | |
1451 | } | |
1452 | ||
1453 | qemu_put_be32(f, i); | |
1454 | ||
87b3bd1c | 1455 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1456 | if (vdev->vq[i].vring.num == 0) |
1457 | break; | |
1458 | ||
1459 | qemu_put_be32(f, vdev->vq[i].vring.num); | |
6ce69d1c PM |
1460 | if (k->has_variable_vring_alignment) { |
1461 | qemu_put_be32(f, vdev->vq[i].vring.align); | |
1462 | } | |
ab223c95 CH |
1463 | /* XXX virtio-1 devices */ |
1464 | qemu_put_be64(f, vdev->vq[i].vring.desc); | |
967f97fa | 1465 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
1c819449 FK |
1466 | if (k->save_queue) { |
1467 | k->save_queue(qbus->parent, i, f); | |
1468 | } | |
967f97fa | 1469 | } |
1b5fc0de GK |
1470 | |
1471 | if (vdc->save != NULL) { | |
1472 | vdc->save(vdev, f); | |
1473 | } | |
6b321a3d GK |
1474 | |
1475 | /* Subsections */ | |
8118f095 | 1476 | vmstate_save_state(f, &vmstate_virtio, vdev, NULL); |
967f97fa AL |
1477 | } |
1478 | ||
5943124c DDAG |
1479 | /* A wrapper for use as a VMState .put function */ |
1480 | void virtio_vmstate_save(QEMUFile *f, void *opaque, size_t size) | |
1481 | { | |
1482 | virtio_save(VIRTIO_DEVICE(opaque), f); | |
1483 | } | |
1484 | ||
6c0196d7 | 1485 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) |
ad0c9332 | 1486 | { |
181103cd | 1487 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
6b8f1020 | 1488 | bool bad = (val & ~(vdev->host_features)) != 0; |
ad0c9332 | 1489 | |
6b8f1020 | 1490 | val &= vdev->host_features; |
181103cd FK |
1491 | if (k->set_features) { |
1492 | k->set_features(vdev, val); | |
ad0c9332 PB |
1493 | } |
1494 | vdev->guest_features = val; | |
1495 | return bad ? -1 : 0; | |
1496 | } | |
1497 | ||
6c0196d7 CH |
1498 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) |
1499 | { | |
1500 | /* | |
1501 | * The driver must not attempt to set features after feature negotiation | |
1502 | * has finished. | |
1503 | */ | |
1504 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { | |
1505 | return -EINVAL; | |
1506 | } | |
1507 | return virtio_set_features_nocheck(vdev, val); | |
1508 | } | |
1509 | ||
1b5fc0de | 1510 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |
967f97fa | 1511 | { |
cc459952 | 1512 | int i, ret; |
a890a2f9 | 1513 | int32_t config_len; |
cc459952 | 1514 | uint32_t num; |
6d74ca5a | 1515 | uint32_t features; |
1c819449 FK |
1516 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1517 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 1518 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa | 1519 | |
616a6552 GK |
1520 | /* |
1521 | * We poison the endianness to ensure it does not get used before | |
1522 | * subsections have been loaded. | |
1523 | */ | |
1524 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; | |
1525 | ||
1c819449 FK |
1526 | if (k->load_config) { |
1527 | ret = k->load_config(qbus->parent, f); | |
ff24bd58 MT |
1528 | if (ret) |
1529 | return ret; | |
1530 | } | |
967f97fa | 1531 | |
967f97fa AL |
1532 | qemu_get_8s(f, &vdev->status); |
1533 | qemu_get_8s(f, &vdev->isr); | |
1534 | qemu_get_be16s(f, &vdev->queue_sel); | |
87b3bd1c | 1535 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { |
4b53c2c7 MR |
1536 | return -1; |
1537 | } | |
6d74ca5a | 1538 | qemu_get_be32s(f, &features); |
ad0c9332 | 1539 | |
62cee1a2 MT |
1540 | /* |
1541 | * Temporarily set guest_features low bits - needed by | |
1542 | * virtio net load code testing for VIRTIO_NET_F_CTRL_GUEST_OFFLOADS | |
1543 | * VIRTIO_NET_F_GUEST_ANNOUNCE and VIRTIO_NET_F_CTRL_VQ. | |
1544 | * | |
1545 | * Note: devices should always test host features in future - don't create | |
1546 | * new dependencies like this. | |
1547 | */ | |
1548 | vdev->guest_features = features; | |
1549 | ||
a890a2f9 | 1550 | config_len = qemu_get_be32(f); |
2f5732e9 DDAG |
1551 | |
1552 | /* | |
1553 | * There are cases where the incoming config can be bigger or smaller | |
1554 | * than what we have; so load what we have space for, and skip | |
1555 | * any excess that's in the stream. | |
1556 | */ | |
1557 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); | |
1558 | ||
1559 | while (config_len > vdev->config_len) { | |
1560 | qemu_get_byte(f); | |
1561 | config_len--; | |
a890a2f9 | 1562 | } |
967f97fa AL |
1563 | |
1564 | num = qemu_get_be32(f); | |
1565 | ||
87b3bd1c | 1566 | if (num > VIRTIO_QUEUE_MAX) { |
8a1be662 | 1567 | error_report("Invalid number of virtqueues: 0x%x", num); |
cc459952 MT |
1568 | return -1; |
1569 | } | |
1570 | ||
967f97fa AL |
1571 | for (i = 0; i < num; i++) { |
1572 | vdev->vq[i].vring.num = qemu_get_be32(f); | |
6ce69d1c PM |
1573 | if (k->has_variable_vring_alignment) { |
1574 | vdev->vq[i].vring.align = qemu_get_be32(f); | |
1575 | } | |
ab223c95 | 1576 | vdev->vq[i].vring.desc = qemu_get_be64(f); |
967f97fa | 1577 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
bcbabae8 MT |
1578 | vdev->vq[i].signalled_used_valid = false; |
1579 | vdev->vq[i].notification = true; | |
967f97fa | 1580 | |
ab223c95 CH |
1581 | if (vdev->vq[i].vring.desc) { |
1582 | /* XXX virtio-1 devices */ | |
1583 | virtio_queue_update_rings(vdev, i); | |
1abeb5a6 MT |
1584 | } else if (vdev->vq[i].last_avail_idx) { |
1585 | error_report("VQ %d address 0x0 " | |
6daf194d | 1586 | "inconsistent with Host index 0x%x", |
1abeb5a6 MT |
1587 | i, vdev->vq[i].last_avail_idx); |
1588 | return -1; | |
258dc7c9 | 1589 | } |
1c819449 FK |
1590 | if (k->load_queue) { |
1591 | ret = k->load_queue(qbus->parent, i, f); | |
ff24bd58 MT |
1592 | if (ret) |
1593 | return ret; | |
7055e687 | 1594 | } |
967f97fa AL |
1595 | } |
1596 | ||
7055e687 | 1597 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
1b5fc0de GK |
1598 | |
1599 | if (vdc->load != NULL) { | |
6b321a3d GK |
1600 | ret = vdc->load(vdev, f, version_id); |
1601 | if (ret) { | |
1602 | return ret; | |
1603 | } | |
1b5fc0de GK |
1604 | } |
1605 | ||
616a6552 GK |
1606 | /* Subsections */ |
1607 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); | |
1608 | if (ret) { | |
1609 | return ret; | |
1610 | } | |
1611 | ||
1612 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { | |
1613 | vdev->device_endian = virtio_default_endian(); | |
1614 | } | |
1615 | ||
019a3edb GH |
1616 | if (virtio_64bit_features_needed(vdev)) { |
1617 | /* | |
1618 | * Subsection load filled vdev->guest_features. Run them | |
1619 | * through virtio_set_features to sanity-check them against | |
1620 | * host_features. | |
1621 | */ | |
1622 | uint64_t features64 = vdev->guest_features; | |
6c0196d7 | 1623 | if (virtio_set_features_nocheck(vdev, features64) < 0) { |
019a3edb GH |
1624 | error_report("Features 0x%" PRIx64 " unsupported. " |
1625 | "Allowed features: 0x%" PRIx64, | |
1626 | features64, vdev->host_features); | |
1627 | return -1; | |
1628 | } | |
1629 | } else { | |
6c0196d7 | 1630 | if (virtio_set_features_nocheck(vdev, features) < 0) { |
019a3edb GH |
1631 | error_report("Features 0x%x unsupported. " |
1632 | "Allowed features: 0x%" PRIx64, | |
1633 | features, vdev->host_features); | |
1634 | return -1; | |
1635 | } | |
1636 | } | |
1637 | ||
616a6552 | 1638 | for (i = 0; i < num; i++) { |
ab223c95 | 1639 | if (vdev->vq[i].vring.desc) { |
616a6552 GK |
1640 | uint16_t nheads; |
1641 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; | |
1642 | /* Check it isn't doing strange things with descriptor numbers. */ | |
1643 | if (nheads > vdev->vq[i].vring.num) { | |
1644 | error_report("VQ %d size 0x%x Guest index 0x%x " | |
1645 | "inconsistent with Host index 0x%x: delta 0x%x", | |
1646 | i, vdev->vq[i].vring.num, | |
1647 | vring_avail_idx(&vdev->vq[i]), | |
1648 | vdev->vq[i].last_avail_idx, nheads); | |
1649 | return -1; | |
1650 | } | |
b796fcd1 | 1651 | vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]); |
be1fea9b | 1652 | vdev->vq[i].shadow_avail_idx = vring_avail_idx(&vdev->vq[i]); |
bccdef6b SH |
1653 | |
1654 | /* | |
1655 | * Some devices migrate VirtQueueElements that have been popped | |
1656 | * from the avail ring but not yet returned to the used ring. | |
1657 | */ | |
1658 | vdev->vq[i].inuse = vdev->vq[i].last_avail_idx - | |
1659 | vdev->vq[i].used_idx; | |
1660 | if (vdev->vq[i].inuse > vdev->vq[i].vring.num) { | |
1661 | error_report("VQ %d size 0x%x < last_avail_idx 0x%x - " | |
1662 | "used_idx 0x%x", | |
1663 | i, vdev->vq[i].vring.num, | |
1664 | vdev->vq[i].last_avail_idx, | |
1665 | vdev->vq[i].used_idx); | |
1666 | return -1; | |
1667 | } | |
616a6552 GK |
1668 | } |
1669 | } | |
1670 | ||
1671 | return 0; | |
967f97fa AL |
1672 | } |
1673 | ||
6a1a8cc7 | 1674 | void virtio_cleanup(VirtIODevice *vdev) |
b946a153 | 1675 | { |
85cf2a8d | 1676 | qemu_del_vm_change_state_handler(vdev->vmstate); |
6f79e06b | 1677 | g_free(vdev->config); |
7267c094 | 1678 | g_free(vdev->vq); |
e0d686bf | 1679 | g_free(vdev->vector_queues); |
8e05db92 FK |
1680 | } |
1681 | ||
1dfb4dd9 | 1682 | static void virtio_vmstate_change(void *opaque, int running, RunState state) |
85cf2a8d MT |
1683 | { |
1684 | VirtIODevice *vdev = opaque; | |
1c819449 FK |
1685 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1686 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
85cf2a8d | 1687 | bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK); |
9e8e8c48 | 1688 | vdev->vm_running = running; |
85cf2a8d MT |
1689 | |
1690 | if (backend_run) { | |
1691 | virtio_set_status(vdev, vdev->status); | |
1692 | } | |
1693 | ||
1c819449 FK |
1694 | if (k->vmstate_change) { |
1695 | k->vmstate_change(qbus->parent, backend_run); | |
85cf2a8d MT |
1696 | } |
1697 | ||
1698 | if (!backend_run) { | |
1699 | virtio_set_status(vdev, vdev->status); | |
1700 | } | |
1701 | } | |
1702 | ||
c8075caf GA |
1703 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
1704 | size_t vdev_size, const char *vdev_name) | |
1705 | { | |
1706 | DeviceState *vdev = data; | |
1707 | ||
1708 | object_initialize(vdev, vdev_size, vdev_name); | |
1709 | object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL); | |
1710 | object_unref(OBJECT(vdev)); | |
1711 | qdev_alias_all_properties(vdev, proxy_obj); | |
1712 | } | |
1713 | ||
8e05db92 FK |
1714 | void virtio_init(VirtIODevice *vdev, const char *name, |
1715 | uint16_t device_id, size_t config_size) | |
967f97fa | 1716 | { |
e0d686bf JW |
1717 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1718 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
b8193adb | 1719 | int i; |
e0d686bf JW |
1720 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; |
1721 | ||
1722 | if (nvectors) { | |
1723 | vdev->vector_queues = | |
1724 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); | |
1725 | } | |
1726 | ||
53c25cea | 1727 | vdev->device_id = device_id; |
967f97fa AL |
1728 | vdev->status = 0; |
1729 | vdev->isr = 0; | |
1730 | vdev->queue_sel = 0; | |
7055e687 | 1731 | vdev->config_vector = VIRTIO_NO_VECTOR; |
87b3bd1c | 1732 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); |
1354869c | 1733 | vdev->vm_running = runstate_is_running(); |
87b3bd1c | 1734 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
b8193adb | 1735 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
1cbdabe2 | 1736 | vdev->vq[i].vdev = vdev; |
e78a2b42 | 1737 | vdev->vq[i].queue_index = i; |
1cbdabe2 | 1738 | } |
967f97fa | 1739 | |
967f97fa AL |
1740 | vdev->name = name; |
1741 | vdev->config_len = config_size; | |
8e05db92 | 1742 | if (vdev->config_len) { |
7267c094 | 1743 | vdev->config = g_malloc0(config_size); |
8e05db92 | 1744 | } else { |
967f97fa | 1745 | vdev->config = NULL; |
8e05db92 FK |
1746 | } |
1747 | vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, | |
1748 | vdev); | |
616a6552 | 1749 | vdev->device_endian = virtio_default_endian(); |
5669655a | 1750 | vdev->use_guest_notifier_mask = true; |
8e05db92 | 1751 | } |
967f97fa | 1752 | |
a8170e5e | 1753 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1754 | { |
1755 | return vdev->vq[n].vring.desc; | |
1756 | } | |
1757 | ||
a8170e5e | 1758 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1759 | { |
1760 | return vdev->vq[n].vring.avail; | |
1761 | } | |
1762 | ||
a8170e5e | 1763 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1764 | { |
1765 | return vdev->vq[n].vring.used; | |
1766 | } | |
1767 | ||
a8170e5e | 1768 | hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1769 | { |
1770 | return vdev->vq[n].vring.desc; | |
1771 | } | |
1772 | ||
a8170e5e | 1773 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1774 | { |
1775 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; | |
1776 | } | |
1777 | ||
a8170e5e | 1778 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1779 | { |
1780 | return offsetof(VRingAvail, ring) + | |
50764fc8 | 1781 | sizeof(uint16_t) * vdev->vq[n].vring.num; |
1cbdabe2 MT |
1782 | } |
1783 | ||
a8170e5e | 1784 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1785 | { |
1786 | return offsetof(VRingUsed, ring) + | |
1787 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num; | |
1788 | } | |
1789 | ||
a8170e5e | 1790 | hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1791 | { |
1792 | return vdev->vq[n].vring.used - vdev->vq[n].vring.desc + | |
1793 | virtio_queue_get_used_size(vdev, n); | |
1794 | } | |
1795 | ||
1796 | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) | |
1797 | { | |
1798 | return vdev->vq[n].last_avail_idx; | |
1799 | } | |
1800 | ||
1801 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) | |
1802 | { | |
1803 | vdev->vq[n].last_avail_idx = idx; | |
be1fea9b | 1804 | vdev->vq[n].shadow_avail_idx = idx; |
1cbdabe2 MT |
1805 | } |
1806 | ||
6793dfd1 SH |
1807 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) |
1808 | { | |
1809 | vdev->vq[n].signalled_used_valid = false; | |
1810 | } | |
1811 | ||
1cbdabe2 MT |
1812 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) |
1813 | { | |
1814 | return vdev->vq + n; | |
1815 | } | |
1816 | ||
e78a2b42 JW |
1817 | uint16_t virtio_get_queue_index(VirtQueue *vq) |
1818 | { | |
1819 | return vq->queue_index; | |
1820 | } | |
1821 | ||
15b2bd18 PB |
1822 | static void virtio_queue_guest_notifier_read(EventNotifier *n) |
1823 | { | |
1824 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); | |
1825 | if (event_notifier_test_and_clear(n)) { | |
1826 | virtio_irq(vq); | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, | |
1831 | bool with_irqfd) | |
1832 | { | |
1833 | if (assign && !with_irqfd) { | |
54e18d35 | 1834 | event_notifier_set_handler(&vq->guest_notifier, false, |
15b2bd18 PB |
1835 | virtio_queue_guest_notifier_read); |
1836 | } else { | |
54e18d35 | 1837 | event_notifier_set_handler(&vq->guest_notifier, false, NULL); |
15b2bd18 PB |
1838 | } |
1839 | if (!assign) { | |
1840 | /* Test and clear notifier before closing it, | |
1841 | * in case poll callback didn't have time to run. */ | |
1842 | virtio_queue_guest_notifier_read(&vq->guest_notifier); | |
1843 | } | |
1844 | } | |
1845 | ||
1cbdabe2 MT |
1846 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
1847 | { | |
1848 | return &vq->guest_notifier; | |
1849 | } | |
b1f416aa | 1850 | |
344dc16f | 1851 | static void virtio_queue_host_notifier_aio_read(EventNotifier *n) |
b1f416aa PB |
1852 | { |
1853 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
1854 | if (event_notifier_test_and_clear(n)) { | |
344dc16f | 1855 | virtio_queue_notify_aio_vq(vq); |
b1f416aa PB |
1856 | } |
1857 | } | |
1858 | ||
a1afb606 | 1859 | void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, |
bf1780b0 | 1860 | VirtIOHandleOutput handle_output) |
a1afb606 | 1861 | { |
a378b49a PB |
1862 | if (handle_output) { |
1863 | vq->handle_aio_output = handle_output; | |
a1afb606 | 1864 | aio_set_event_notifier(ctx, &vq->host_notifier, true, |
344dc16f | 1865 | virtio_queue_host_notifier_aio_read); |
a1afb606 PB |
1866 | } else { |
1867 | aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL); | |
a1afb606 PB |
1868 | /* Test and clear notifier before after disabling event, |
1869 | * in case poll callback didn't have time to run. */ | |
344dc16f | 1870 | virtio_queue_host_notifier_aio_read(&vq->host_notifier); |
a378b49a | 1871 | vq->handle_aio_output = NULL; |
344dc16f MT |
1872 | } |
1873 | } | |
1874 | ||
1875 | static void virtio_queue_host_notifier_read(EventNotifier *n) | |
1876 | { | |
1877 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
1878 | if (event_notifier_test_and_clear(n)) { | |
1879 | virtio_queue_notify_vq(vq); | |
a1afb606 PB |
1880 | } |
1881 | } | |
1882 | ||
26b9b5fe PB |
1883 | void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, |
1884 | bool set_handler) | |
b1f416aa | 1885 | { |
872dd82c | 1886 | AioContext *ctx = qemu_get_aio_context(); |
26b9b5fe | 1887 | if (assign && set_handler) { |
872dd82c FZ |
1888 | if (vq->use_aio) { |
1889 | aio_set_event_notifier(ctx, &vq->host_notifier, true, | |
b1f416aa | 1890 | virtio_queue_host_notifier_read); |
872dd82c FZ |
1891 | } else { |
1892 | event_notifier_set_handler(&vq->host_notifier, true, | |
1893 | virtio_queue_host_notifier_read); | |
1894 | } | |
b1f416aa | 1895 | } else { |
872dd82c FZ |
1896 | if (vq->use_aio) { |
1897 | aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL); | |
1898 | } else { | |
1899 | event_notifier_set_handler(&vq->host_notifier, true, NULL); | |
1900 | } | |
26b9b5fe PB |
1901 | } |
1902 | if (!assign) { | |
b1f416aa PB |
1903 | /* Test and clear notifier before after disabling event, |
1904 | * in case poll callback didn't have time to run. */ | |
1905 | virtio_queue_host_notifier_read(&vq->host_notifier); | |
1906 | } | |
1907 | } | |
1908 | ||
1cbdabe2 MT |
1909 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
1910 | { | |
1911 | return &vq->host_notifier; | |
1912 | } | |
8e05db92 | 1913 | |
1034e9cf FK |
1914 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) |
1915 | { | |
9e288406 | 1916 | g_free(vdev->bus_name); |
80e0090a | 1917 | vdev->bus_name = g_strdup(bus_name); |
1034e9cf FK |
1918 | } |
1919 | ||
1d244b42 AF |
1920 | static void virtio_device_realize(DeviceState *dev, Error **errp) |
1921 | { | |
1922 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
1923 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
1924 | Error *err = NULL; | |
1925 | ||
1d244b42 AF |
1926 | if (vdc->realize != NULL) { |
1927 | vdc->realize(dev, &err); | |
1928 | if (err != NULL) { | |
1929 | error_propagate(errp, err); | |
1930 | return; | |
1931 | } | |
8e05db92 | 1932 | } |
e8398045 JW |
1933 | |
1934 | virtio_bus_device_plugged(vdev, &err); | |
1935 | if (err != NULL) { | |
1936 | error_propagate(errp, err); | |
1937 | return; | |
1938 | } | |
8e05db92 FK |
1939 | } |
1940 | ||
1d244b42 | 1941 | static void virtio_device_unrealize(DeviceState *dev, Error **errp) |
1034e9cf | 1942 | { |
1d244b42 | 1943 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
306ec6c3 AF |
1944 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
1945 | Error *err = NULL; | |
1d244b42 | 1946 | |
83d07047 PB |
1947 | virtio_bus_device_unplugged(vdev); |
1948 | ||
306ec6c3 AF |
1949 | if (vdc->unrealize != NULL) { |
1950 | vdc->unrealize(dev, &err); | |
1951 | if (err != NULL) { | |
1952 | error_propagate(errp, err); | |
1953 | return; | |
1954 | } | |
5e96f5d2 | 1955 | } |
1d244b42 | 1956 | |
9e288406 MA |
1957 | g_free(vdev->bus_name); |
1958 | vdev->bus_name = NULL; | |
1034e9cf FK |
1959 | } |
1960 | ||
6b8f1020 CH |
1961 | static Property virtio_properties[] = { |
1962 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), | |
1963 | DEFINE_PROP_END_OF_LIST(), | |
1964 | }; | |
1965 | ||
8e05db92 FK |
1966 | static void virtio_device_class_init(ObjectClass *klass, void *data) |
1967 | { | |
1968 | /* Set the default value here. */ | |
1969 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1d244b42 AF |
1970 | |
1971 | dc->realize = virtio_device_realize; | |
1972 | dc->unrealize = virtio_device_unrealize; | |
8e05db92 | 1973 | dc->bus_type = TYPE_VIRTIO_BUS; |
6b8f1020 | 1974 | dc->props = virtio_properties; |
8e05db92 FK |
1975 | } |
1976 | ||
1977 | static const TypeInfo virtio_device_info = { | |
1978 | .name = TYPE_VIRTIO_DEVICE, | |
1979 | .parent = TYPE_DEVICE, | |
1980 | .instance_size = sizeof(VirtIODevice), | |
1981 | .class_init = virtio_device_class_init, | |
1982 | .abstract = true, | |
1983 | .class_size = sizeof(VirtioDeviceClass), | |
1984 | }; | |
1985 | ||
1986 | static void virtio_register_types(void) | |
1987 | { | |
1988 | type_register_static(&virtio_device_info); | |
1989 | } | |
1990 | ||
1991 | type_init(virtio_register_types) |