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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" |
967f97fa | 15 | |
64979a4d | 16 | #include "trace.h" |
fdfba1a2 | 17 | #include "exec/address-spaces.h" |
1de7afc9 | 18 | #include "qemu/error-report.h" |
0d09e41a | 19 | #include "hw/virtio/virtio.h" |
1de7afc9 | 20 | #include "qemu/atomic.h" |
0d09e41a | 21 | #include "hw/virtio/virtio-bus.h" |
6b321a3d | 22 | #include "migration/migration.h" |
cee3ca00 | 23 | #include "hw/virtio/virtio-access.h" |
967f97fa | 24 | |
6ce69d1c PM |
25 | /* |
26 | * The alignment to use between consumer and producer parts of vring. | |
27 | * x86 pagesize again. This is the default, used by transports like PCI | |
28 | * which don't provide a means for the guest to tell the host the alignment. | |
29 | */ | |
f46f15bc AL |
30 | #define VIRTIO_PCI_VRING_ALIGN 4096 |
31 | ||
967f97fa AL |
32 | typedef struct VRingDesc |
33 | { | |
34 | uint64_t addr; | |
35 | uint32_t len; | |
36 | uint16_t flags; | |
37 | uint16_t next; | |
38 | } VRingDesc; | |
39 | ||
40 | typedef struct VRingAvail | |
41 | { | |
42 | uint16_t flags; | |
43 | uint16_t idx; | |
44 | uint16_t ring[0]; | |
45 | } VRingAvail; | |
46 | ||
47 | typedef struct VRingUsedElem | |
48 | { | |
49 | uint32_t id; | |
50 | uint32_t len; | |
51 | } VRingUsedElem; | |
52 | ||
53 | typedef struct VRingUsed | |
54 | { | |
55 | uint16_t flags; | |
56 | uint16_t idx; | |
57 | VRingUsedElem ring[0]; | |
58 | } VRingUsed; | |
59 | ||
60 | typedef struct VRing | |
61 | { | |
62 | unsigned int num; | |
46c5d082 | 63 | unsigned int num_default; |
6ce69d1c | 64 | unsigned int align; |
a8170e5e AK |
65 | hwaddr desc; |
66 | hwaddr avail; | |
67 | hwaddr used; | |
967f97fa AL |
68 | } VRing; |
69 | ||
70 | struct VirtQueue | |
71 | { | |
72 | VRing vring; | |
967f97fa | 73 | uint16_t last_avail_idx; |
bcbabae8 MT |
74 | /* Last used index value we have signalled on */ |
75 | uint16_t signalled_used; | |
76 | ||
77 | /* Last used index value we have signalled on */ | |
78 | bool signalled_used_valid; | |
79 | ||
80 | /* Notification enabled? */ | |
81 | bool notification; | |
82 | ||
e78a2b42 JW |
83 | uint16_t queue_index; |
84 | ||
967f97fa | 85 | int inuse; |
bcbabae8 | 86 | |
7055e687 | 87 | uint16_t vector; |
967f97fa | 88 | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq); |
1cbdabe2 MT |
89 | VirtIODevice *vdev; |
90 | EventNotifier guest_notifier; | |
91 | EventNotifier host_notifier; | |
e0d686bf | 92 | QLIST_ENTRY(VirtQueue) node; |
967f97fa AL |
93 | }; |
94 | ||
967f97fa | 95 | /* virt queue functions */ |
ab223c95 | 96 | void virtio_queue_update_rings(VirtIODevice *vdev, int n) |
967f97fa | 97 | { |
ab223c95 | 98 | VRing *vring = &vdev->vq[n].vring; |
53c25cea | 99 | |
ab223c95 CH |
100 | if (!vring->desc) { |
101 | /* not yet setup -> nothing to do */ | |
102 | return; | |
103 | } | |
104 | vring->avail = vring->desc + vring->num * sizeof(VRingDesc); | |
105 | vring->used = vring_align(vring->avail + | |
106 | offsetof(VRingAvail, ring[vring->num]), | |
107 | vring->align); | |
967f97fa AL |
108 | } |
109 | ||
cee3ca00 RR |
110 | static inline uint64_t vring_desc_addr(VirtIODevice *vdev, hwaddr desc_pa, |
111 | int i) | |
967f97fa | 112 | { |
a8170e5e | 113 | hwaddr pa; |
5774cf98 | 114 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr); |
cee3ca00 | 115 | return virtio_ldq_phys(vdev, pa); |
967f97fa AL |
116 | } |
117 | ||
cee3ca00 | 118 | static inline uint32_t vring_desc_len(VirtIODevice *vdev, hwaddr desc_pa, int i) |
967f97fa | 119 | { |
a8170e5e | 120 | hwaddr pa; |
5774cf98 | 121 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len); |
cee3ca00 | 122 | return virtio_ldl_phys(vdev, pa); |
967f97fa AL |
123 | } |
124 | ||
cee3ca00 RR |
125 | static inline uint16_t vring_desc_flags(VirtIODevice *vdev, hwaddr desc_pa, |
126 | int i) | |
967f97fa | 127 | { |
a8170e5e | 128 | hwaddr pa; |
5774cf98 | 129 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags); |
cee3ca00 | 130 | return virtio_lduw_phys(vdev, pa); |
967f97fa AL |
131 | } |
132 | ||
cee3ca00 RR |
133 | static inline uint16_t vring_desc_next(VirtIODevice *vdev, hwaddr desc_pa, |
134 | int i) | |
967f97fa | 135 | { |
a8170e5e | 136 | hwaddr pa; |
5774cf98 | 137 | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next); |
cee3ca00 | 138 | return virtio_lduw_phys(vdev, pa); |
967f97fa AL |
139 | } |
140 | ||
141 | static inline uint16_t vring_avail_flags(VirtQueue *vq) | |
142 | { | |
a8170e5e | 143 | hwaddr pa; |
967f97fa | 144 | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
cee3ca00 | 145 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
146 | } |
147 | ||
148 | static inline uint16_t vring_avail_idx(VirtQueue *vq) | |
149 | { | |
a8170e5e | 150 | hwaddr pa; |
967f97fa | 151 | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
cee3ca00 | 152 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
153 | } |
154 | ||
155 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) | |
156 | { | |
a8170e5e | 157 | hwaddr pa; |
967f97fa | 158 | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
cee3ca00 | 159 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
160 | } |
161 | ||
e9600c6c | 162 | static inline uint16_t vring_get_used_event(VirtQueue *vq) |
bcbabae8 MT |
163 | { |
164 | return vring_avail_ring(vq, vq->vring.num); | |
165 | } | |
166 | ||
967f97fa AL |
167 | static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
168 | { | |
a8170e5e | 169 | hwaddr pa; |
967f97fa | 170 | pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
cee3ca00 | 171 | virtio_stl_phys(vq->vdev, pa, val); |
967f97fa AL |
172 | } |
173 | ||
174 | static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) | |
175 | { | |
a8170e5e | 176 | hwaddr pa; |
967f97fa | 177 | pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
cee3ca00 | 178 | virtio_stl_phys(vq->vdev, pa, val); |
967f97fa AL |
179 | } |
180 | ||
181 | static uint16_t vring_used_idx(VirtQueue *vq) | |
182 | { | |
a8170e5e | 183 | hwaddr pa; |
967f97fa | 184 | pa = vq->vring.used + offsetof(VRingUsed, idx); |
cee3ca00 | 185 | return virtio_lduw_phys(vq->vdev, pa); |
967f97fa AL |
186 | } |
187 | ||
bcbabae8 | 188 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
967f97fa | 189 | { |
a8170e5e | 190 | hwaddr pa; |
967f97fa | 191 | pa = vq->vring.used + offsetof(VRingUsed, idx); |
cee3ca00 | 192 | virtio_stw_phys(vq->vdev, pa, val); |
967f97fa AL |
193 | } |
194 | ||
195 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) | |
196 | { | |
cee3ca00 | 197 | VirtIODevice *vdev = vq->vdev; |
a8170e5e | 198 | hwaddr pa; |
967f97fa | 199 | pa = vq->vring.used + offsetof(VRingUsed, flags); |
cee3ca00 | 200 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) | mask); |
967f97fa AL |
201 | } |
202 | ||
203 | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) | |
204 | { | |
cee3ca00 | 205 | VirtIODevice *vdev = vq->vdev; |
a8170e5e | 206 | hwaddr pa; |
967f97fa | 207 | pa = vq->vring.used + offsetof(VRingUsed, flags); |
cee3ca00 | 208 | virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) & ~mask); |
967f97fa AL |
209 | } |
210 | ||
e9600c6c | 211 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) |
bcbabae8 | 212 | { |
a8170e5e | 213 | hwaddr pa; |
bcbabae8 MT |
214 | if (!vq->notification) { |
215 | return; | |
216 | } | |
217 | pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]); | |
cee3ca00 | 218 | virtio_stw_phys(vq->vdev, pa, val); |
bcbabae8 MT |
219 | } |
220 | ||
967f97fa AL |
221 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
222 | { | |
bcbabae8 | 223 | vq->notification = enable; |
95129d6f | 224 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 225 | vring_set_avail_event(vq, vring_avail_idx(vq)); |
bcbabae8 | 226 | } else if (enable) { |
967f97fa | 227 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 228 | } else { |
967f97fa | 229 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 230 | } |
92045d80 MT |
231 | if (enable) { |
232 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
233 | smp_mb(); | |
234 | } | |
967f97fa AL |
235 | } |
236 | ||
237 | int virtio_queue_ready(VirtQueue *vq) | |
238 | { | |
239 | return vq->vring.avail != 0; | |
240 | } | |
241 | ||
242 | int virtio_queue_empty(VirtQueue *vq) | |
243 | { | |
244 | return vring_avail_idx(vq) == vq->last_avail_idx; | |
245 | } | |
246 | ||
ce317461 JW |
247 | static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, |
248 | unsigned int len) | |
967f97fa AL |
249 | { |
250 | unsigned int offset; | |
251 | int i; | |
252 | ||
967f97fa AL |
253 | offset = 0; |
254 | for (i = 0; i < elem->in_num; i++) { | |
255 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); | |
256 | ||
26b258e1 AL |
257 | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
258 | elem->in_sg[i].iov_len, | |
259 | 1, size); | |
967f97fa | 260 | |
0cea71a2 | 261 | offset += size; |
967f97fa AL |
262 | } |
263 | ||
26b258e1 AL |
264 | for (i = 0; i < elem->out_num; i++) |
265 | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, | |
266 | elem->out_sg[i].iov_len, | |
267 | 0, elem->out_sg[i].iov_len); | |
ce317461 JW |
268 | } |
269 | ||
29b9f5ef JW |
270 | void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem, |
271 | unsigned int len) | |
272 | { | |
273 | vq->last_avail_idx--; | |
274 | virtqueue_unmap_sg(vq, elem, len); | |
275 | } | |
276 | ||
ce317461 JW |
277 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
278 | unsigned int len, unsigned int idx) | |
279 | { | |
280 | trace_virtqueue_fill(vq, elem, len, idx); | |
281 | ||
282 | virtqueue_unmap_sg(vq, elem, len); | |
26b258e1 | 283 | |
967f97fa AL |
284 | idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
285 | ||
286 | /* Get a pointer to the next entry in the used ring. */ | |
287 | vring_used_ring_id(vq, idx, elem->index); | |
288 | vring_used_ring_len(vq, idx, len); | |
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); |
bcbabae8 MT |
297 | old = vring_used_idx(vq); |
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 SH |
318 | error_report("Guest moved used index from %u to %u", |
319 | idx, vring_avail_idx(vq)); | |
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 | ||
cee3ca00 | 348 | static unsigned virtqueue_next_desc(VirtIODevice *vdev, hwaddr desc_pa, |
5774cf98 | 349 | unsigned int i, unsigned int max) |
967f97fa AL |
350 | { |
351 | unsigned int next; | |
352 | ||
353 | /* If this descriptor says it doesn't chain, we're done. */ | |
cee3ca00 | 354 | if (!(vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_NEXT)) { |
5774cf98 | 355 | return max; |
cee3ca00 | 356 | } |
967f97fa AL |
357 | |
358 | /* Check they're not leading us off end of descriptors. */ | |
cee3ca00 | 359 | next = vring_desc_next(vdev, desc_pa, i); |
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 AL |
367 | |
368 | return next; | |
369 | } | |
370 | ||
0d8d7690 | 371 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, |
e1f7b481 MT |
372 | unsigned int *out_bytes, |
373 | unsigned max_in_bytes, unsigned max_out_bytes) | |
967f97fa | 374 | { |
efeea6d0 | 375 | unsigned int idx; |
385ce95d | 376 | unsigned int total_bufs, in_total, out_total; |
967f97fa AL |
377 | |
378 | idx = vq->last_avail_idx; | |
379 | ||
efeea6d0 | 380 | total_bufs = in_total = out_total = 0; |
967f97fa | 381 | while (virtqueue_num_heads(vq, idx)) { |
cee3ca00 | 382 | VirtIODevice *vdev = vq->vdev; |
efeea6d0 | 383 | unsigned int max, num_bufs, indirect = 0; |
a8170e5e | 384 | hwaddr desc_pa; |
967f97fa AL |
385 | int i; |
386 | ||
efeea6d0 MM |
387 | max = vq->vring.num; |
388 | num_bufs = total_bufs; | |
967f97fa | 389 | i = virtqueue_get_head(vq, idx++); |
efeea6d0 MM |
390 | desc_pa = vq->vring.desc; |
391 | ||
cee3ca00 RR |
392 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) { |
393 | if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) { | |
ce67ed65 | 394 | error_report("Invalid size for indirect buffer table"); |
efeea6d0 MM |
395 | exit(1); |
396 | } | |
397 | ||
398 | /* If we've got too many, that implies a descriptor loop. */ | |
399 | if (num_bufs >= max) { | |
ce67ed65 | 400 | error_report("Looped descriptor"); |
efeea6d0 MM |
401 | exit(1); |
402 | } | |
403 | ||
404 | /* loop over the indirect descriptor table */ | |
405 | indirect = 1; | |
cee3ca00 RR |
406 | max = vring_desc_len(vdev, desc_pa, i) / sizeof(VRingDesc); |
407 | desc_pa = vring_desc_addr(vdev, desc_pa, i); | |
1ae2757c | 408 | num_bufs = i = 0; |
efeea6d0 MM |
409 | } |
410 | ||
967f97fa AL |
411 | do { |
412 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 413 | if (++num_bufs > max) { |
ce67ed65 | 414 | error_report("Looped descriptor"); |
bb6834cf AL |
415 | exit(1); |
416 | } | |
967f97fa | 417 | |
cee3ca00 RR |
418 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_WRITE) { |
419 | in_total += vring_desc_len(vdev, desc_pa, i); | |
967f97fa | 420 | } else { |
cee3ca00 | 421 | out_total += vring_desc_len(vdev, desc_pa, i); |
967f97fa | 422 | } |
e1f7b481 MT |
423 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
424 | goto done; | |
425 | } | |
cee3ca00 | 426 | } while ((i = virtqueue_next_desc(vdev, desc_pa, i, max)) != max); |
efeea6d0 MM |
427 | |
428 | if (!indirect) | |
429 | total_bufs = num_bufs; | |
430 | else | |
431 | total_bufs++; | |
967f97fa | 432 | } |
e1f7b481 | 433 | done: |
0d8d7690 AS |
434 | if (in_bytes) { |
435 | *in_bytes = in_total; | |
436 | } | |
437 | if (out_bytes) { | |
438 | *out_bytes = out_total; | |
439 | } | |
440 | } | |
967f97fa | 441 | |
0d8d7690 AS |
442 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
443 | unsigned int out_bytes) | |
444 | { | |
445 | unsigned int in_total, out_total; | |
446 | ||
e1f7b481 MT |
447 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); |
448 | return in_bytes <= in_total && out_bytes <= out_total; | |
967f97fa AL |
449 | } |
450 | ||
3b3b0628 PB |
451 | static void virtqueue_map_desc(unsigned int *p_num_sg, hwaddr *addr, struct iovec *iov, |
452 | unsigned int max_num_sg, bool is_write, | |
453 | hwaddr pa, size_t sz) | |
454 | { | |
455 | unsigned num_sg = *p_num_sg; | |
456 | assert(num_sg <= max_num_sg); | |
457 | ||
458 | while (sz) { | |
459 | hwaddr len = sz; | |
460 | ||
461 | if (num_sg == max_num_sg) { | |
462 | error_report("virtio: too many write descriptors in indirect table"); | |
463 | exit(1); | |
464 | } | |
465 | ||
466 | iov[num_sg].iov_base = cpu_physical_memory_map(pa, &len, is_write); | |
467 | iov[num_sg].iov_len = len; | |
468 | addr[num_sg] = pa; | |
469 | ||
470 | sz -= len; | |
471 | pa += len; | |
472 | num_sg++; | |
473 | } | |
474 | *p_num_sg = num_sg; | |
475 | } | |
476 | ||
8059feee MT |
477 | static void virtqueue_map_iovec(struct iovec *sg, hwaddr *addr, |
478 | unsigned int *num_sg, unsigned int max_size, | |
479 | int is_write) | |
42fb2e07 KW |
480 | { |
481 | unsigned int i; | |
a8170e5e | 482 | hwaddr len; |
42fb2e07 | 483 | |
8059feee MT |
484 | /* Note: this function MUST validate input, some callers |
485 | * are passing in num_sg values received over the network. | |
486 | */ | |
487 | /* TODO: teach all callers that this can fail, and return failure instead | |
488 | * of asserting here. | |
489 | * When we do, we might be able to re-enable NDEBUG below. | |
490 | */ | |
491 | #ifdef NDEBUG | |
492 | #error building with NDEBUG is not supported | |
493 | #endif | |
494 | assert(*num_sg <= max_size); | |
495 | ||
496 | for (i = 0; i < *num_sg; i++) { | |
42fb2e07 KW |
497 | len = sg[i].iov_len; |
498 | sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); | |
8059feee | 499 | if (!sg[i].iov_base) { |
1a285899 | 500 | error_report("virtio: error trying to map MMIO memory"); |
42fb2e07 KW |
501 | exit(1); |
502 | } | |
3b3b0628 PB |
503 | if (len != sg[i].iov_len) { |
504 | error_report("virtio: unexpected memory split"); | |
8059feee MT |
505 | exit(1); |
506 | } | |
42fb2e07 KW |
507 | } |
508 | } | |
509 | ||
8059feee MT |
510 | void virtqueue_map(VirtQueueElement *elem) |
511 | { | |
512 | virtqueue_map_iovec(elem->in_sg, elem->in_addr, &elem->in_num, | |
3724650d | 513 | VIRTQUEUE_MAX_SIZE, 1); |
8059feee | 514 | virtqueue_map_iovec(elem->out_sg, elem->out_addr, &elem->out_num, |
3724650d PB |
515 | VIRTQUEUE_MAX_SIZE, 0); |
516 | } | |
517 | ||
518 | void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num) | |
519 | { | |
520 | VirtQueueElement *elem; | |
521 | size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0])); | |
522 | size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]); | |
523 | size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]); | |
524 | size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0])); | |
525 | size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); | |
526 | size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); | |
527 | ||
528 | assert(sz >= sizeof(VirtQueueElement)); | |
529 | elem = g_malloc(out_sg_end); | |
530 | elem->out_num = out_num; | |
531 | elem->in_num = in_num; | |
532 | elem->in_addr = (void *)elem + in_addr_ofs; | |
533 | elem->out_addr = (void *)elem + out_addr_ofs; | |
534 | elem->in_sg = (void *)elem + in_sg_ofs; | |
535 | elem->out_sg = (void *)elem + out_sg_ofs; | |
536 | return elem; | |
8059feee MT |
537 | } |
538 | ||
51b19ebe | 539 | void *virtqueue_pop(VirtQueue *vq, size_t sz) |
967f97fa | 540 | { |
5774cf98 | 541 | unsigned int i, head, max; |
a8170e5e | 542 | hwaddr desc_pa = vq->vring.desc; |
cee3ca00 | 543 | VirtIODevice *vdev = vq->vdev; |
51b19ebe | 544 | VirtQueueElement *elem; |
3b3b0628 PB |
545 | unsigned out_num, in_num; |
546 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; | |
547 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
967f97fa | 548 | |
51b19ebe PB |
549 | if (!virtqueue_num_heads(vq, vq->last_avail_idx)) { |
550 | return NULL; | |
551 | } | |
967f97fa AL |
552 | |
553 | /* When we start there are none of either input nor output. */ | |
3b3b0628 | 554 | out_num = in_num = 0; |
967f97fa | 555 | |
5774cf98 MM |
556 | max = vq->vring.num; |
557 | ||
967f97fa | 558 | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
95129d6f | 559 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 560 | vring_set_avail_event(vq, vq->last_avail_idx); |
bcbabae8 | 561 | } |
efeea6d0 | 562 | |
cee3ca00 RR |
563 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) { |
564 | if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) { | |
ce67ed65 | 565 | error_report("Invalid size for indirect buffer table"); |
efeea6d0 MM |
566 | exit(1); |
567 | } | |
568 | ||
569 | /* loop over the indirect descriptor table */ | |
cee3ca00 RR |
570 | max = vring_desc_len(vdev, desc_pa, i) / sizeof(VRingDesc); |
571 | desc_pa = vring_desc_addr(vdev, desc_pa, i); | |
efeea6d0 MM |
572 | i = 0; |
573 | } | |
574 | ||
42fb2e07 | 575 | /* Collect all the descriptors */ |
967f97fa | 576 | do { |
3b3b0628 PB |
577 | hwaddr pa = vring_desc_addr(vdev, desc_pa, i); |
578 | size_t len = vring_desc_len(vdev, desc_pa, i); | |
967f97fa | 579 | |
cee3ca00 | 580 | if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_WRITE) { |
3b3b0628 PB |
581 | virtqueue_map_desc(&in_num, addr + out_num, iov + out_num, |
582 | VIRTQUEUE_MAX_SIZE - out_num, true, pa, len); | |
42fb2e07 | 583 | } else { |
3b3b0628 PB |
584 | if (in_num) { |
585 | error_report("Incorrect order for descriptors"); | |
c8eac1cf MT |
586 | exit(1); |
587 | } | |
3b3b0628 PB |
588 | virtqueue_map_desc(&out_num, addr, iov, |
589 | VIRTQUEUE_MAX_SIZE, false, pa, len); | |
42fb2e07 | 590 | } |
967f97fa | 591 | |
967f97fa | 592 | /* If we've got too many, that implies a descriptor loop. */ |
3b3b0628 | 593 | if ((in_num + out_num) > max) { |
ce67ed65 | 594 | error_report("Looped descriptor"); |
bb6834cf AL |
595 | exit(1); |
596 | } | |
cee3ca00 | 597 | } while ((i = virtqueue_next_desc(vdev, desc_pa, i, max)) != max); |
967f97fa | 598 | |
3b3b0628 PB |
599 | /* Now copy what we have collected and mapped */ |
600 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
967f97fa | 601 | elem->index = head; |
3b3b0628 PB |
602 | for (i = 0; i < out_num; i++) { |
603 | elem->out_addr[i] = addr[i]; | |
604 | elem->out_sg[i] = iov[i]; | |
605 | } | |
606 | for (i = 0; i < in_num; i++) { | |
607 | elem->in_addr[i] = addr[out_num + i]; | |
608 | elem->in_sg[i] = iov[out_num + i]; | |
609 | } | |
967f97fa AL |
610 | |
611 | vq->inuse++; | |
612 | ||
64979a4d | 613 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
51b19ebe | 614 | return elem; |
967f97fa AL |
615 | } |
616 | ||
3724650d PB |
617 | /* Reading and writing a structure directly to QEMUFile is *awful*, but |
618 | * it is what QEMU has always done by mistake. We can change it sooner | |
619 | * or later by bumping the version number of the affected vm states. | |
620 | * In the meanwhile, since the in-memory layout of VirtQueueElement | |
621 | * has changed, we need to marshal to and from the layout that was | |
622 | * used before the change. | |
623 | */ | |
624 | typedef struct VirtQueueElementOld { | |
625 | unsigned int index; | |
626 | unsigned int out_num; | |
627 | unsigned int in_num; | |
628 | hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; | |
629 | hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; | |
630 | struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; | |
631 | struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; | |
632 | } VirtQueueElementOld; | |
633 | ||
ab281c17 PB |
634 | void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz) |
635 | { | |
3724650d PB |
636 | VirtQueueElement *elem; |
637 | VirtQueueElementOld data; | |
638 | int i; | |
639 | ||
640 | qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
641 | ||
642 | elem = virtqueue_alloc_element(sz, data.out_num, data.in_num); | |
643 | elem->index = data.index; | |
644 | ||
645 | for (i = 0; i < elem->in_num; i++) { | |
646 | elem->in_addr[i] = data.in_addr[i]; | |
647 | } | |
648 | ||
649 | for (i = 0; i < elem->out_num; i++) { | |
650 | elem->out_addr[i] = data.out_addr[i]; | |
651 | } | |
652 | ||
653 | for (i = 0; i < elem->in_num; i++) { | |
654 | /* Base is overwritten by virtqueue_map. */ | |
655 | elem->in_sg[i].iov_base = 0; | |
656 | elem->in_sg[i].iov_len = data.in_sg[i].iov_len; | |
657 | } | |
658 | ||
659 | for (i = 0; i < elem->out_num; i++) { | |
660 | /* Base is overwritten by virtqueue_map. */ | |
661 | elem->out_sg[i].iov_base = 0; | |
662 | elem->out_sg[i].iov_len = data.out_sg[i].iov_len; | |
663 | } | |
664 | ||
ab281c17 PB |
665 | virtqueue_map(elem); |
666 | return elem; | |
667 | } | |
668 | ||
669 | void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem) | |
670 | { | |
3724650d PB |
671 | VirtQueueElementOld data; |
672 | int i; | |
673 | ||
674 | memset(&data, 0, sizeof(data)); | |
675 | data.index = elem->index; | |
676 | data.in_num = elem->in_num; | |
677 | data.out_num = elem->out_num; | |
678 | ||
679 | for (i = 0; i < elem->in_num; i++) { | |
680 | data.in_addr[i] = elem->in_addr[i]; | |
681 | } | |
682 | ||
683 | for (i = 0; i < elem->out_num; i++) { | |
684 | data.out_addr[i] = elem->out_addr[i]; | |
685 | } | |
686 | ||
687 | for (i = 0; i < elem->in_num; i++) { | |
688 | /* Base is overwritten by virtqueue_map when loading. Do not | |
689 | * save it, as it would leak the QEMU address space layout. */ | |
690 | data.in_sg[i].iov_len = elem->in_sg[i].iov_len; | |
691 | } | |
692 | ||
693 | for (i = 0; i < elem->out_num; i++) { | |
694 | /* Do not save iov_base as above. */ | |
695 | data.out_sg[i].iov_len = elem->out_sg[i].iov_len; | |
696 | } | |
697 | qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
ab281c17 PB |
698 | } |
699 | ||
967f97fa | 700 | /* virtio device */ |
7055e687 MT |
701 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
702 | { | |
1c819449 FK |
703 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
704 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
705 | ||
706 | if (k->notify) { | |
707 | k->notify(qbus->parent, vector); | |
7055e687 MT |
708 | } |
709 | } | |
967f97fa | 710 | |
53c25cea | 711 | void virtio_update_irq(VirtIODevice *vdev) |
967f97fa | 712 | { |
7055e687 | 713 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
967f97fa AL |
714 | } |
715 | ||
0b352fd6 CH |
716 | static int virtio_validate_features(VirtIODevice *vdev) |
717 | { | |
718 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
719 | ||
720 | if (k->validate_features) { | |
721 | return k->validate_features(vdev); | |
722 | } else { | |
723 | return 0; | |
724 | } | |
725 | } | |
726 | ||
727 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) | |
4e1837f8 | 728 | { |
181103cd | 729 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
4e1837f8 SH |
730 | trace_virtio_set_status(vdev, val); |
731 | ||
95129d6f | 732 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
0b352fd6 CH |
733 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && |
734 | val & VIRTIO_CONFIG_S_FEATURES_OK) { | |
735 | int ret = virtio_validate_features(vdev); | |
736 | ||
737 | if (ret) { | |
738 | return ret; | |
739 | } | |
740 | } | |
741 | } | |
181103cd FK |
742 | if (k->set_status) { |
743 | k->set_status(vdev, val); | |
4e1837f8 SH |
744 | } |
745 | vdev->status = val; | |
0b352fd6 | 746 | return 0; |
4e1837f8 SH |
747 | } |
748 | ||
616a6552 GK |
749 | bool target_words_bigendian(void); |
750 | static enum virtio_device_endian virtio_default_endian(void) | |
751 | { | |
752 | if (target_words_bigendian()) { | |
753 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
754 | } else { | |
755 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
756 | } | |
757 | } | |
758 | ||
759 | static enum virtio_device_endian virtio_current_cpu_endian(void) | |
760 | { | |
761 | CPUClass *cc = CPU_GET_CLASS(current_cpu); | |
762 | ||
763 | if (cc->virtio_is_big_endian(current_cpu)) { | |
764 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
765 | } else { | |
766 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
767 | } | |
768 | } | |
769 | ||
53c25cea | 770 | void virtio_reset(void *opaque) |
967f97fa AL |
771 | { |
772 | VirtIODevice *vdev = opaque; | |
181103cd | 773 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
774 | int i; |
775 | ||
e0c472d8 | 776 | virtio_set_status(vdev, 0); |
616a6552 GK |
777 | if (current_cpu) { |
778 | /* Guest initiated reset */ | |
779 | vdev->device_endian = virtio_current_cpu_endian(); | |
780 | } else { | |
781 | /* System reset */ | |
782 | vdev->device_endian = virtio_default_endian(); | |
783 | } | |
e0c472d8 | 784 | |
181103cd FK |
785 | if (k->reset) { |
786 | k->reset(vdev); | |
787 | } | |
967f97fa | 788 | |
704a76fc | 789 | vdev->guest_features = 0; |
967f97fa AL |
790 | vdev->queue_sel = 0; |
791 | vdev->status = 0; | |
792 | vdev->isr = 0; | |
7055e687 MT |
793 | vdev->config_vector = VIRTIO_NO_VECTOR; |
794 | virtio_notify_vector(vdev, vdev->config_vector); | |
967f97fa | 795 | |
87b3bd1c | 796 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
797 | vdev->vq[i].vring.desc = 0; |
798 | vdev->vq[i].vring.avail = 0; | |
799 | vdev->vq[i].vring.used = 0; | |
800 | vdev->vq[i].last_avail_idx = 0; | |
e0d686bf | 801 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); |
bcbabae8 MT |
802 | vdev->vq[i].signalled_used = 0; |
803 | vdev->vq[i].signalled_used_valid = false; | |
804 | vdev->vq[i].notification = true; | |
46c5d082 | 805 | vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; |
967f97fa AL |
806 | } |
807 | } | |
808 | ||
53c25cea | 809 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 810 | { |
181103cd | 811 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
812 | uint8_t val; |
813 | ||
5f5a1318 | 814 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 815 | return (uint32_t)-1; |
5f5a1318 JW |
816 | } |
817 | ||
818 | k->get_config(vdev, vdev->config); | |
967f97fa | 819 | |
06dbfc6f | 820 | val = ldub_p(vdev->config + addr); |
967f97fa AL |
821 | return val; |
822 | } | |
823 | ||
53c25cea | 824 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 825 | { |
181103cd | 826 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
827 | uint16_t val; |
828 | ||
5f5a1318 | 829 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 830 | return (uint32_t)-1; |
5f5a1318 JW |
831 | } |
832 | ||
833 | k->get_config(vdev, vdev->config); | |
967f97fa | 834 | |
06dbfc6f | 835 | val = lduw_p(vdev->config + addr); |
967f97fa AL |
836 | return val; |
837 | } | |
838 | ||
53c25cea | 839 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 840 | { |
181103cd | 841 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
842 | uint32_t val; |
843 | ||
5f5a1318 | 844 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 845 | return (uint32_t)-1; |
5f5a1318 JW |
846 | } |
847 | ||
848 | k->get_config(vdev, vdev->config); | |
967f97fa | 849 | |
06dbfc6f | 850 | val = ldl_p(vdev->config + addr); |
967f97fa AL |
851 | return val; |
852 | } | |
853 | ||
53c25cea | 854 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 855 | { |
181103cd | 856 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
857 | uint8_t val = data; |
858 | ||
5f5a1318 | 859 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 860 | return; |
5f5a1318 | 861 | } |
967f97fa | 862 | |
06dbfc6f | 863 | stb_p(vdev->config + addr, val); |
967f97fa | 864 | |
181103cd FK |
865 | if (k->set_config) { |
866 | k->set_config(vdev, vdev->config); | |
867 | } | |
967f97fa AL |
868 | } |
869 | ||
53c25cea | 870 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 871 | { |
181103cd | 872 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
873 | uint16_t val = data; |
874 | ||
5f5a1318 | 875 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 876 | return; |
5f5a1318 | 877 | } |
967f97fa | 878 | |
06dbfc6f | 879 | stw_p(vdev->config + addr, val); |
967f97fa | 880 | |
181103cd FK |
881 | if (k->set_config) { |
882 | k->set_config(vdev, vdev->config); | |
883 | } | |
967f97fa AL |
884 | } |
885 | ||
53c25cea | 886 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 887 | { |
181103cd | 888 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
889 | uint32_t val = data; |
890 | ||
5f5a1318 | 891 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 892 | return; |
5f5a1318 | 893 | } |
967f97fa | 894 | |
06dbfc6f | 895 | stl_p(vdev->config + addr, val); |
967f97fa | 896 | |
181103cd FK |
897 | if (k->set_config) { |
898 | k->set_config(vdev, vdev->config); | |
899 | } | |
967f97fa AL |
900 | } |
901 | ||
adfb743c MT |
902 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr) |
903 | { | |
904 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
905 | uint8_t val; | |
906 | ||
907 | if (addr + sizeof(val) > vdev->config_len) { | |
908 | return (uint32_t)-1; | |
909 | } | |
910 | ||
911 | k->get_config(vdev, vdev->config); | |
912 | ||
913 | val = ldub_p(vdev->config + addr); | |
914 | return val; | |
915 | } | |
916 | ||
917 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr) | |
918 | { | |
919 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
920 | uint16_t val; | |
921 | ||
922 | if (addr + sizeof(val) > vdev->config_len) { | |
923 | return (uint32_t)-1; | |
924 | } | |
925 | ||
926 | k->get_config(vdev, vdev->config); | |
927 | ||
928 | val = lduw_le_p(vdev->config + addr); | |
929 | return val; | |
930 | } | |
931 | ||
932 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr) | |
933 | { | |
934 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
935 | uint32_t val; | |
936 | ||
937 | if (addr + sizeof(val) > vdev->config_len) { | |
938 | return (uint32_t)-1; | |
939 | } | |
940 | ||
941 | k->get_config(vdev, vdev->config); | |
942 | ||
943 | val = ldl_le_p(vdev->config + addr); | |
944 | return val; | |
945 | } | |
946 | ||
947 | void virtio_config_modern_writeb(VirtIODevice *vdev, | |
948 | uint32_t addr, uint32_t data) | |
949 | { | |
950 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
951 | uint8_t val = data; | |
952 | ||
953 | if (addr + sizeof(val) > vdev->config_len) { | |
954 | return; | |
955 | } | |
956 | ||
957 | stb_p(vdev->config + addr, val); | |
958 | ||
959 | if (k->set_config) { | |
960 | k->set_config(vdev, vdev->config); | |
961 | } | |
962 | } | |
963 | ||
964 | void virtio_config_modern_writew(VirtIODevice *vdev, | |
965 | uint32_t addr, uint32_t data) | |
966 | { | |
967 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
968 | uint16_t val = data; | |
969 | ||
970 | if (addr + sizeof(val) > vdev->config_len) { | |
971 | return; | |
972 | } | |
973 | ||
974 | stw_le_p(vdev->config + addr, val); | |
975 | ||
976 | if (k->set_config) { | |
977 | k->set_config(vdev, vdev->config); | |
978 | } | |
979 | } | |
980 | ||
981 | void virtio_config_modern_writel(VirtIODevice *vdev, | |
982 | uint32_t addr, uint32_t data) | |
983 | { | |
984 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
985 | uint32_t val = data; | |
986 | ||
987 | if (addr + sizeof(val) > vdev->config_len) { | |
988 | return; | |
989 | } | |
990 | ||
991 | stl_le_p(vdev->config + addr, val); | |
992 | ||
993 | if (k->set_config) { | |
994 | k->set_config(vdev, vdev->config); | |
995 | } | |
996 | } | |
997 | ||
a8170e5e | 998 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) |
967f97fa | 999 | { |
ab223c95 CH |
1000 | vdev->vq[n].vring.desc = addr; |
1001 | virtio_queue_update_rings(vdev, n); | |
53c25cea PB |
1002 | } |
1003 | ||
a8170e5e | 1004 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) |
53c25cea | 1005 | { |
ab223c95 CH |
1006 | return vdev->vq[n].vring.desc; |
1007 | } | |
1008 | ||
1009 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, | |
1010 | hwaddr avail, hwaddr used) | |
1011 | { | |
1012 | vdev->vq[n].vring.desc = desc; | |
1013 | vdev->vq[n].vring.avail = avail; | |
1014 | vdev->vq[n].vring.used = used; | |
53c25cea PB |
1015 | } |
1016 | ||
e63c0ba1 PM |
1017 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) |
1018 | { | |
f6049f44 PM |
1019 | /* Don't allow guest to flip queue between existent and |
1020 | * nonexistent states, or to set it to an invalid size. | |
1021 | */ | |
1022 | if (!!num != !!vdev->vq[n].vring.num || | |
1023 | num > VIRTQUEUE_MAX_SIZE || | |
1024 | num < 0) { | |
1025 | return; | |
e63c0ba1 | 1026 | } |
f6049f44 | 1027 | vdev->vq[n].vring.num = num; |
e63c0ba1 PM |
1028 | } |
1029 | ||
e0d686bf JW |
1030 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) |
1031 | { | |
1032 | return QLIST_FIRST(&vdev->vector_queues[vector]); | |
1033 | } | |
1034 | ||
1035 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) | |
1036 | { | |
1037 | return QLIST_NEXT(vq, node); | |
1038 | } | |
1039 | ||
53c25cea PB |
1040 | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
1041 | { | |
1042 | return vdev->vq[n].vring.num; | |
1043 | } | |
967f97fa | 1044 | |
8ad176aa JW |
1045 | int virtio_get_num_queues(VirtIODevice *vdev) |
1046 | { | |
1047 | int i; | |
1048 | ||
87b3bd1c | 1049 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
8ad176aa JW |
1050 | if (!virtio_queue_get_num(vdev, i)) { |
1051 | break; | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | return i; | |
1056 | } | |
1057 | ||
c80decdb PB |
1058 | int virtio_queue_get_id(VirtQueue *vq) |
1059 | { | |
1060 | VirtIODevice *vdev = vq->vdev; | |
87b3bd1c | 1061 | assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_QUEUE_MAX]); |
c80decdb PB |
1062 | return vq - &vdev->vq[0]; |
1063 | } | |
1064 | ||
6ce69d1c PM |
1065 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) |
1066 | { | |
1067 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1068 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1069 | ||
ab223c95 | 1070 | /* virtio-1 compliant devices cannot change the alignment */ |
95129d6f | 1071 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
ab223c95 CH |
1072 | error_report("tried to modify queue alignment for virtio-1 device"); |
1073 | return; | |
1074 | } | |
6ce69d1c PM |
1075 | /* Check that the transport told us it was going to do this |
1076 | * (so a buggy transport will immediately assert rather than | |
1077 | * silently failing to migrate this state) | |
1078 | */ | |
1079 | assert(k->has_variable_vring_alignment); | |
1080 | ||
1081 | vdev->vq[n].vring.align = align; | |
ab223c95 | 1082 | virtio_queue_update_rings(vdev, n); |
6ce69d1c PM |
1083 | } |
1084 | ||
25db9ebe SH |
1085 | void virtio_queue_notify_vq(VirtQueue *vq) |
1086 | { | |
9e0f5b81 | 1087 | if (vq->vring.desc && vq->handle_output) { |
25db9ebe | 1088 | VirtIODevice *vdev = vq->vdev; |
9e0f5b81 | 1089 | |
25db9ebe SH |
1090 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
1091 | vq->handle_output(vdev, vq); | |
1092 | } | |
1093 | } | |
1094 | ||
53c25cea PB |
1095 | void virtio_queue_notify(VirtIODevice *vdev, int n) |
1096 | { | |
7157e2e2 | 1097 | virtio_queue_notify_vq(&vdev->vq[n]); |
967f97fa AL |
1098 | } |
1099 | ||
7055e687 MT |
1100 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) |
1101 | { | |
87b3bd1c | 1102 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : |
7055e687 MT |
1103 | VIRTIO_NO_VECTOR; |
1104 | } | |
1105 | ||
1106 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) | |
1107 | { | |
e0d686bf JW |
1108 | VirtQueue *vq = &vdev->vq[n]; |
1109 | ||
87b3bd1c | 1110 | if (n < VIRTIO_QUEUE_MAX) { |
e0d686bf JW |
1111 | if (vdev->vector_queues && |
1112 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { | |
1113 | QLIST_REMOVE(vq, node); | |
1114 | } | |
7055e687 | 1115 | vdev->vq[n].vector = vector; |
e0d686bf JW |
1116 | if (vdev->vector_queues && |
1117 | vector != VIRTIO_NO_VECTOR) { | |
1118 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); | |
1119 | } | |
1120 | } | |
7055e687 MT |
1121 | } |
1122 | ||
967f97fa AL |
1123 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, |
1124 | void (*handle_output)(VirtIODevice *, VirtQueue *)) | |
1125 | { | |
1126 | int i; | |
1127 | ||
87b3bd1c | 1128 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1129 | if (vdev->vq[i].vring.num == 0) |
1130 | break; | |
1131 | } | |
1132 | ||
87b3bd1c | 1133 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) |
967f97fa AL |
1134 | abort(); |
1135 | ||
1136 | vdev->vq[i].vring.num = queue_size; | |
46c5d082 | 1137 | vdev->vq[i].vring.num_default = queue_size; |
6ce69d1c | 1138 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; |
967f97fa AL |
1139 | vdev->vq[i].handle_output = handle_output; |
1140 | ||
1141 | return &vdev->vq[i]; | |
1142 | } | |
1143 | ||
f23fd811 JW |
1144 | void virtio_del_queue(VirtIODevice *vdev, int n) |
1145 | { | |
87b3bd1c | 1146 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { |
f23fd811 JW |
1147 | abort(); |
1148 | } | |
1149 | ||
1150 | vdev->vq[n].vring.num = 0; | |
46c5d082 | 1151 | vdev->vq[n].vring.num_default = 0; |
f23fd811 JW |
1152 | } |
1153 | ||
1cbdabe2 MT |
1154 | void virtio_irq(VirtQueue *vq) |
1155 | { | |
64979a4d | 1156 | trace_virtio_irq(vq); |
1cbdabe2 MT |
1157 | vq->vdev->isr |= 0x01; |
1158 | virtio_notify_vector(vq->vdev, vq->vector); | |
1159 | } | |
1160 | ||
bcbabae8 MT |
1161 | static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq) |
1162 | { | |
1163 | uint16_t old, new; | |
1164 | bool v; | |
a281ebc1 MT |
1165 | /* We need to expose used array entries before checking used event. */ |
1166 | smp_mb(); | |
97b83deb | 1167 | /* Always notify when queue is empty (when feature acknowledge) */ |
95129d6f | 1168 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && |
ef546f12 | 1169 | !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx) { |
bcbabae8 MT |
1170 | return true; |
1171 | } | |
1172 | ||
95129d6f | 1173 | if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
bcbabae8 MT |
1174 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); |
1175 | } | |
1176 | ||
1177 | v = vq->signalled_used_valid; | |
1178 | vq->signalled_used_valid = true; | |
1179 | old = vq->signalled_used; | |
1180 | new = vq->signalled_used = vring_used_idx(vq); | |
e9600c6c | 1181 | return !v || vring_need_event(vring_get_used_event(vq), new, old); |
bcbabae8 MT |
1182 | } |
1183 | ||
1184 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) | |
1185 | { | |
1186 | if (!vring_notify(vdev, vq)) { | |
967f97fa | 1187 | return; |
bcbabae8 | 1188 | } |
967f97fa | 1189 | |
64979a4d | 1190 | trace_virtio_notify(vdev, vq); |
967f97fa | 1191 | vdev->isr |= 0x01; |
7055e687 | 1192 | virtio_notify_vector(vdev, vq->vector); |
967f97fa AL |
1193 | } |
1194 | ||
1195 | void virtio_notify_config(VirtIODevice *vdev) | |
1196 | { | |
7625162c AL |
1197 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) |
1198 | return; | |
1199 | ||
967f97fa | 1200 | vdev->isr |= 0x03; |
b8f05908 | 1201 | vdev->generation++; |
7055e687 | 1202 | virtio_notify_vector(vdev, vdev->config_vector); |
967f97fa AL |
1203 | } |
1204 | ||
616a6552 GK |
1205 | static bool virtio_device_endian_needed(void *opaque) |
1206 | { | |
1207 | VirtIODevice *vdev = opaque; | |
1208 | ||
1209 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); | |
95129d6f | 1210 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
3c185597 CH |
1211 | return vdev->device_endian != virtio_default_endian(); |
1212 | } | |
1213 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
1214 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; | |
616a6552 GK |
1215 | } |
1216 | ||
019a3edb GH |
1217 | static bool virtio_64bit_features_needed(void *opaque) |
1218 | { | |
1219 | VirtIODevice *vdev = opaque; | |
1220 | ||
1221 | return (vdev->host_features >> 32) != 0; | |
1222 | } | |
1223 | ||
74aae7b2 JW |
1224 | static bool virtio_virtqueue_needed(void *opaque) |
1225 | { | |
1226 | VirtIODevice *vdev = opaque; | |
1227 | ||
1228 | return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1); | |
1229 | } | |
1230 | ||
46c5d082 CH |
1231 | static bool virtio_ringsize_needed(void *opaque) |
1232 | { | |
1233 | VirtIODevice *vdev = opaque; | |
1234 | int i; | |
1235 | ||
1236 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
1237 | if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) { | |
1238 | return true; | |
1239 | } | |
1240 | } | |
1241 | return false; | |
1242 | } | |
1243 | ||
a6df8adf JW |
1244 | static bool virtio_extra_state_needed(void *opaque) |
1245 | { | |
1246 | VirtIODevice *vdev = opaque; | |
1247 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1248 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1249 | ||
1250 | return k->has_extra_state && | |
1251 | k->has_extra_state(qbus->parent); | |
1252 | } | |
1253 | ||
50e5ae4d | 1254 | static const VMStateDescription vmstate_virtqueue = { |
74aae7b2 | 1255 | .name = "virtqueue_state", |
50e5ae4d DDAG |
1256 | .version_id = 1, |
1257 | .minimum_version_id = 1, | |
1258 | .fields = (VMStateField[]) { | |
1259 | VMSTATE_UINT64(vring.avail, struct VirtQueue), | |
1260 | VMSTATE_UINT64(vring.used, struct VirtQueue), | |
1261 | VMSTATE_END_OF_LIST() | |
1262 | } | |
74aae7b2 JW |
1263 | }; |
1264 | ||
1265 | static const VMStateDescription vmstate_virtio_virtqueues = { | |
1266 | .name = "virtio/virtqueues", | |
1267 | .version_id = 1, | |
1268 | .minimum_version_id = 1, | |
1269 | .needed = &virtio_virtqueue_needed, | |
1270 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
1271 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
1272 | VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue), | |
74aae7b2 JW |
1273 | VMSTATE_END_OF_LIST() |
1274 | } | |
1275 | }; | |
1276 | ||
50e5ae4d | 1277 | static const VMStateDescription vmstate_ringsize = { |
46c5d082 | 1278 | .name = "ringsize_state", |
50e5ae4d DDAG |
1279 | .version_id = 1, |
1280 | .minimum_version_id = 1, | |
1281 | .fields = (VMStateField[]) { | |
1282 | VMSTATE_UINT32(vring.num_default, struct VirtQueue), | |
1283 | VMSTATE_END_OF_LIST() | |
1284 | } | |
46c5d082 CH |
1285 | }; |
1286 | ||
1287 | static const VMStateDescription vmstate_virtio_ringsize = { | |
1288 | .name = "virtio/ringsize", | |
1289 | .version_id = 1, | |
1290 | .minimum_version_id = 1, | |
1291 | .needed = &virtio_ringsize_needed, | |
1292 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
1293 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
1294 | VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue), | |
46c5d082 CH |
1295 | VMSTATE_END_OF_LIST() |
1296 | } | |
1297 | }; | |
1298 | ||
a6df8adf JW |
1299 | static int get_extra_state(QEMUFile *f, void *pv, size_t size) |
1300 | { | |
1301 | VirtIODevice *vdev = pv; | |
1302 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1303 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1304 | ||
1305 | if (!k->load_extra_state) { | |
1306 | return -1; | |
1307 | } else { | |
1308 | return k->load_extra_state(qbus->parent, f); | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | static void put_extra_state(QEMUFile *f, void *pv, size_t size) | |
1313 | { | |
1314 | VirtIODevice *vdev = pv; | |
1315 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
1316 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1317 | ||
1318 | k->save_extra_state(qbus->parent, f); | |
1319 | } | |
1320 | ||
1321 | static const VMStateInfo vmstate_info_extra_state = { | |
1322 | .name = "virtqueue_extra_state", | |
1323 | .get = get_extra_state, | |
1324 | .put = put_extra_state, | |
1325 | }; | |
1326 | ||
1327 | static const VMStateDescription vmstate_virtio_extra_state = { | |
1328 | .name = "virtio/extra_state", | |
1329 | .version_id = 1, | |
1330 | .minimum_version_id = 1, | |
1331 | .needed = &virtio_extra_state_needed, | |
1332 | .fields = (VMStateField[]) { | |
1333 | { | |
1334 | .name = "extra_state", | |
1335 | .version_id = 0, | |
1336 | .field_exists = NULL, | |
1337 | .size = 0, | |
1338 | .info = &vmstate_info_extra_state, | |
1339 | .flags = VMS_SINGLE, | |
1340 | .offset = 0, | |
1341 | }, | |
1342 | VMSTATE_END_OF_LIST() | |
1343 | } | |
1344 | }; | |
1345 | ||
616a6552 GK |
1346 | static const VMStateDescription vmstate_virtio_device_endian = { |
1347 | .name = "virtio/device_endian", | |
1348 | .version_id = 1, | |
1349 | .minimum_version_id = 1, | |
5cd8cada | 1350 | .needed = &virtio_device_endian_needed, |
616a6552 GK |
1351 | .fields = (VMStateField[]) { |
1352 | VMSTATE_UINT8(device_endian, VirtIODevice), | |
1353 | VMSTATE_END_OF_LIST() | |
1354 | } | |
1355 | }; | |
1356 | ||
019a3edb GH |
1357 | static const VMStateDescription vmstate_virtio_64bit_features = { |
1358 | .name = "virtio/64bit_features", | |
1359 | .version_id = 1, | |
1360 | .minimum_version_id = 1, | |
5cd8cada | 1361 | .needed = &virtio_64bit_features_needed, |
019a3edb GH |
1362 | .fields = (VMStateField[]) { |
1363 | VMSTATE_UINT64(guest_features, VirtIODevice), | |
1364 | VMSTATE_END_OF_LIST() | |
1365 | } | |
1366 | }; | |
1367 | ||
6b321a3d GK |
1368 | static const VMStateDescription vmstate_virtio = { |
1369 | .name = "virtio", | |
1370 | .version_id = 1, | |
1371 | .minimum_version_id = 1, | |
1372 | .minimum_version_id_old = 1, | |
1373 | .fields = (VMStateField[]) { | |
1374 | VMSTATE_END_OF_LIST() | |
616a6552 | 1375 | }, |
5cd8cada JQ |
1376 | .subsections = (const VMStateDescription*[]) { |
1377 | &vmstate_virtio_device_endian, | |
1378 | &vmstate_virtio_64bit_features, | |
74aae7b2 | 1379 | &vmstate_virtio_virtqueues, |
46c5d082 | 1380 | &vmstate_virtio_ringsize, |
a6df8adf | 1381 | &vmstate_virtio_extra_state, |
5cd8cada | 1382 | NULL |
6b321a3d GK |
1383 | } |
1384 | }; | |
1385 | ||
967f97fa AL |
1386 | void virtio_save(VirtIODevice *vdev, QEMUFile *f) |
1387 | { | |
1c819449 FK |
1388 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1389 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 1390 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
019a3edb | 1391 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); |
967f97fa AL |
1392 | int i; |
1393 | ||
1c819449 FK |
1394 | if (k->save_config) { |
1395 | k->save_config(qbus->parent, f); | |
1396 | } | |
967f97fa | 1397 | |
967f97fa AL |
1398 | qemu_put_8s(f, &vdev->status); |
1399 | qemu_put_8s(f, &vdev->isr); | |
1400 | qemu_put_be16s(f, &vdev->queue_sel); | |
019a3edb | 1401 | qemu_put_be32s(f, &guest_features_lo); |
967f97fa AL |
1402 | qemu_put_be32(f, vdev->config_len); |
1403 | qemu_put_buffer(f, vdev->config, vdev->config_len); | |
1404 | ||
87b3bd1c | 1405 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1406 | if (vdev->vq[i].vring.num == 0) |
1407 | break; | |
1408 | } | |
1409 | ||
1410 | qemu_put_be32(f, i); | |
1411 | ||
87b3bd1c | 1412 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
1413 | if (vdev->vq[i].vring.num == 0) |
1414 | break; | |
1415 | ||
1416 | qemu_put_be32(f, vdev->vq[i].vring.num); | |
6ce69d1c PM |
1417 | if (k->has_variable_vring_alignment) { |
1418 | qemu_put_be32(f, vdev->vq[i].vring.align); | |
1419 | } | |
ab223c95 CH |
1420 | /* XXX virtio-1 devices */ |
1421 | qemu_put_be64(f, vdev->vq[i].vring.desc); | |
967f97fa | 1422 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
1c819449 FK |
1423 | if (k->save_queue) { |
1424 | k->save_queue(qbus->parent, i, f); | |
1425 | } | |
967f97fa | 1426 | } |
1b5fc0de GK |
1427 | |
1428 | if (vdc->save != NULL) { | |
1429 | vdc->save(vdev, f); | |
1430 | } | |
6b321a3d GK |
1431 | |
1432 | /* Subsections */ | |
8118f095 | 1433 | vmstate_save_state(f, &vmstate_virtio, vdev, NULL); |
967f97fa AL |
1434 | } |
1435 | ||
6c0196d7 | 1436 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) |
ad0c9332 | 1437 | { |
181103cd | 1438 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
6b8f1020 | 1439 | bool bad = (val & ~(vdev->host_features)) != 0; |
ad0c9332 | 1440 | |
6b8f1020 | 1441 | val &= vdev->host_features; |
181103cd FK |
1442 | if (k->set_features) { |
1443 | k->set_features(vdev, val); | |
ad0c9332 PB |
1444 | } |
1445 | vdev->guest_features = val; | |
1446 | return bad ? -1 : 0; | |
1447 | } | |
1448 | ||
6c0196d7 CH |
1449 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) |
1450 | { | |
1451 | /* | |
1452 | * The driver must not attempt to set features after feature negotiation | |
1453 | * has finished. | |
1454 | */ | |
1455 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { | |
1456 | return -EINVAL; | |
1457 | } | |
1458 | return virtio_set_features_nocheck(vdev, val); | |
1459 | } | |
1460 | ||
1b5fc0de | 1461 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |
967f97fa | 1462 | { |
cc459952 | 1463 | int i, ret; |
a890a2f9 | 1464 | int32_t config_len; |
cc459952 | 1465 | uint32_t num; |
6d74ca5a | 1466 | uint32_t features; |
1c819449 FK |
1467 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1468 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 1469 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa | 1470 | |
616a6552 GK |
1471 | /* |
1472 | * We poison the endianness to ensure it does not get used before | |
1473 | * subsections have been loaded. | |
1474 | */ | |
1475 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; | |
1476 | ||
1c819449 FK |
1477 | if (k->load_config) { |
1478 | ret = k->load_config(qbus->parent, f); | |
ff24bd58 MT |
1479 | if (ret) |
1480 | return ret; | |
1481 | } | |
967f97fa | 1482 | |
967f97fa AL |
1483 | qemu_get_8s(f, &vdev->status); |
1484 | qemu_get_8s(f, &vdev->isr); | |
1485 | qemu_get_be16s(f, &vdev->queue_sel); | |
87b3bd1c | 1486 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { |
4b53c2c7 MR |
1487 | return -1; |
1488 | } | |
6d74ca5a | 1489 | qemu_get_be32s(f, &features); |
ad0c9332 | 1490 | |
a890a2f9 | 1491 | config_len = qemu_get_be32(f); |
2f5732e9 DDAG |
1492 | |
1493 | /* | |
1494 | * There are cases where the incoming config can be bigger or smaller | |
1495 | * than what we have; so load what we have space for, and skip | |
1496 | * any excess that's in the stream. | |
1497 | */ | |
1498 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); | |
1499 | ||
1500 | while (config_len > vdev->config_len) { | |
1501 | qemu_get_byte(f); | |
1502 | config_len--; | |
a890a2f9 | 1503 | } |
967f97fa AL |
1504 | |
1505 | num = qemu_get_be32(f); | |
1506 | ||
87b3bd1c | 1507 | if (num > VIRTIO_QUEUE_MAX) { |
8a1be662 | 1508 | error_report("Invalid number of virtqueues: 0x%x", num); |
cc459952 MT |
1509 | return -1; |
1510 | } | |
1511 | ||
967f97fa AL |
1512 | for (i = 0; i < num; i++) { |
1513 | vdev->vq[i].vring.num = qemu_get_be32(f); | |
6ce69d1c PM |
1514 | if (k->has_variable_vring_alignment) { |
1515 | vdev->vq[i].vring.align = qemu_get_be32(f); | |
1516 | } | |
ab223c95 | 1517 | vdev->vq[i].vring.desc = qemu_get_be64(f); |
967f97fa | 1518 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
bcbabae8 MT |
1519 | vdev->vq[i].signalled_used_valid = false; |
1520 | vdev->vq[i].notification = true; | |
967f97fa | 1521 | |
ab223c95 CH |
1522 | if (vdev->vq[i].vring.desc) { |
1523 | /* XXX virtio-1 devices */ | |
1524 | virtio_queue_update_rings(vdev, i); | |
1abeb5a6 MT |
1525 | } else if (vdev->vq[i].last_avail_idx) { |
1526 | error_report("VQ %d address 0x0 " | |
6daf194d | 1527 | "inconsistent with Host index 0x%x", |
1abeb5a6 MT |
1528 | i, vdev->vq[i].last_avail_idx); |
1529 | return -1; | |
258dc7c9 | 1530 | } |
1c819449 FK |
1531 | if (k->load_queue) { |
1532 | ret = k->load_queue(qbus->parent, i, f); | |
ff24bd58 MT |
1533 | if (ret) |
1534 | return ret; | |
7055e687 | 1535 | } |
967f97fa AL |
1536 | } |
1537 | ||
7055e687 | 1538 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
1b5fc0de GK |
1539 | |
1540 | if (vdc->load != NULL) { | |
6b321a3d GK |
1541 | ret = vdc->load(vdev, f, version_id); |
1542 | if (ret) { | |
1543 | return ret; | |
1544 | } | |
1b5fc0de GK |
1545 | } |
1546 | ||
616a6552 GK |
1547 | /* Subsections */ |
1548 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); | |
1549 | if (ret) { | |
1550 | return ret; | |
1551 | } | |
1552 | ||
1553 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { | |
1554 | vdev->device_endian = virtio_default_endian(); | |
1555 | } | |
1556 | ||
019a3edb GH |
1557 | if (virtio_64bit_features_needed(vdev)) { |
1558 | /* | |
1559 | * Subsection load filled vdev->guest_features. Run them | |
1560 | * through virtio_set_features to sanity-check them against | |
1561 | * host_features. | |
1562 | */ | |
1563 | uint64_t features64 = vdev->guest_features; | |
6c0196d7 | 1564 | if (virtio_set_features_nocheck(vdev, features64) < 0) { |
019a3edb GH |
1565 | error_report("Features 0x%" PRIx64 " unsupported. " |
1566 | "Allowed features: 0x%" PRIx64, | |
1567 | features64, vdev->host_features); | |
1568 | return -1; | |
1569 | } | |
1570 | } else { | |
6c0196d7 | 1571 | if (virtio_set_features_nocheck(vdev, features) < 0) { |
019a3edb GH |
1572 | error_report("Features 0x%x unsupported. " |
1573 | "Allowed features: 0x%" PRIx64, | |
1574 | features, vdev->host_features); | |
1575 | return -1; | |
1576 | } | |
1577 | } | |
1578 | ||
616a6552 | 1579 | for (i = 0; i < num; i++) { |
ab223c95 | 1580 | if (vdev->vq[i].vring.desc) { |
616a6552 GK |
1581 | uint16_t nheads; |
1582 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; | |
1583 | /* Check it isn't doing strange things with descriptor numbers. */ | |
1584 | if (nheads > vdev->vq[i].vring.num) { | |
1585 | error_report("VQ %d size 0x%x Guest index 0x%x " | |
1586 | "inconsistent with Host index 0x%x: delta 0x%x", | |
1587 | i, vdev->vq[i].vring.num, | |
1588 | vring_avail_idx(&vdev->vq[i]), | |
1589 | vdev->vq[i].last_avail_idx, nheads); | |
1590 | return -1; | |
1591 | } | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | return 0; | |
967f97fa AL |
1596 | } |
1597 | ||
6a1a8cc7 | 1598 | void virtio_cleanup(VirtIODevice *vdev) |
b946a153 | 1599 | { |
85cf2a8d | 1600 | qemu_del_vm_change_state_handler(vdev->vmstate); |
6f79e06b | 1601 | g_free(vdev->config); |
7267c094 | 1602 | g_free(vdev->vq); |
e0d686bf | 1603 | g_free(vdev->vector_queues); |
8e05db92 FK |
1604 | } |
1605 | ||
1dfb4dd9 | 1606 | static void virtio_vmstate_change(void *opaque, int running, RunState state) |
85cf2a8d MT |
1607 | { |
1608 | VirtIODevice *vdev = opaque; | |
1c819449 FK |
1609 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1610 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
85cf2a8d | 1611 | bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK); |
9e8e8c48 | 1612 | vdev->vm_running = running; |
85cf2a8d MT |
1613 | |
1614 | if (backend_run) { | |
1615 | virtio_set_status(vdev, vdev->status); | |
1616 | } | |
1617 | ||
1c819449 FK |
1618 | if (k->vmstate_change) { |
1619 | k->vmstate_change(qbus->parent, backend_run); | |
85cf2a8d MT |
1620 | } |
1621 | ||
1622 | if (!backend_run) { | |
1623 | virtio_set_status(vdev, vdev->status); | |
1624 | } | |
1625 | } | |
1626 | ||
c8075caf GA |
1627 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
1628 | size_t vdev_size, const char *vdev_name) | |
1629 | { | |
1630 | DeviceState *vdev = data; | |
1631 | ||
1632 | object_initialize(vdev, vdev_size, vdev_name); | |
1633 | object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL); | |
1634 | object_unref(OBJECT(vdev)); | |
1635 | qdev_alias_all_properties(vdev, proxy_obj); | |
1636 | } | |
1637 | ||
8e05db92 FK |
1638 | void virtio_init(VirtIODevice *vdev, const char *name, |
1639 | uint16_t device_id, size_t config_size) | |
967f97fa | 1640 | { |
e0d686bf JW |
1641 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1642 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
b8193adb | 1643 | int i; |
e0d686bf JW |
1644 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; |
1645 | ||
1646 | if (nvectors) { | |
1647 | vdev->vector_queues = | |
1648 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); | |
1649 | } | |
1650 | ||
53c25cea | 1651 | vdev->device_id = device_id; |
967f97fa AL |
1652 | vdev->status = 0; |
1653 | vdev->isr = 0; | |
1654 | vdev->queue_sel = 0; | |
7055e687 | 1655 | vdev->config_vector = VIRTIO_NO_VECTOR; |
87b3bd1c | 1656 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); |
1354869c | 1657 | vdev->vm_running = runstate_is_running(); |
87b3bd1c | 1658 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
b8193adb | 1659 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
1cbdabe2 | 1660 | vdev->vq[i].vdev = vdev; |
e78a2b42 | 1661 | vdev->vq[i].queue_index = i; |
1cbdabe2 | 1662 | } |
967f97fa | 1663 | |
967f97fa AL |
1664 | vdev->name = name; |
1665 | vdev->config_len = config_size; | |
8e05db92 | 1666 | if (vdev->config_len) { |
7267c094 | 1667 | vdev->config = g_malloc0(config_size); |
8e05db92 | 1668 | } else { |
967f97fa | 1669 | vdev->config = NULL; |
8e05db92 FK |
1670 | } |
1671 | vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, | |
1672 | vdev); | |
616a6552 | 1673 | vdev->device_endian = virtio_default_endian(); |
8e05db92 | 1674 | } |
967f97fa | 1675 | |
a8170e5e | 1676 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1677 | { |
1678 | return vdev->vq[n].vring.desc; | |
1679 | } | |
1680 | ||
a8170e5e | 1681 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1682 | { |
1683 | return vdev->vq[n].vring.avail; | |
1684 | } | |
1685 | ||
a8170e5e | 1686 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1687 | { |
1688 | return vdev->vq[n].vring.used; | |
1689 | } | |
1690 | ||
a8170e5e | 1691 | hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1692 | { |
1693 | return vdev->vq[n].vring.desc; | |
1694 | } | |
1695 | ||
a8170e5e | 1696 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1697 | { |
1698 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; | |
1699 | } | |
1700 | ||
a8170e5e | 1701 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1702 | { |
1703 | return offsetof(VRingAvail, ring) + | |
50764fc8 | 1704 | sizeof(uint16_t) * vdev->vq[n].vring.num; |
1cbdabe2 MT |
1705 | } |
1706 | ||
a8170e5e | 1707 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1708 | { |
1709 | return offsetof(VRingUsed, ring) + | |
1710 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num; | |
1711 | } | |
1712 | ||
a8170e5e | 1713 | hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
1714 | { |
1715 | return vdev->vq[n].vring.used - vdev->vq[n].vring.desc + | |
1716 | virtio_queue_get_used_size(vdev, n); | |
1717 | } | |
1718 | ||
1719 | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) | |
1720 | { | |
1721 | return vdev->vq[n].last_avail_idx; | |
1722 | } | |
1723 | ||
1724 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) | |
1725 | { | |
1726 | vdev->vq[n].last_avail_idx = idx; | |
1727 | } | |
1728 | ||
6793dfd1 SH |
1729 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) |
1730 | { | |
1731 | vdev->vq[n].signalled_used_valid = false; | |
1732 | } | |
1733 | ||
1cbdabe2 MT |
1734 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) |
1735 | { | |
1736 | return vdev->vq + n; | |
1737 | } | |
1738 | ||
e78a2b42 JW |
1739 | uint16_t virtio_get_queue_index(VirtQueue *vq) |
1740 | { | |
1741 | return vq->queue_index; | |
1742 | } | |
1743 | ||
15b2bd18 PB |
1744 | static void virtio_queue_guest_notifier_read(EventNotifier *n) |
1745 | { | |
1746 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); | |
1747 | if (event_notifier_test_and_clear(n)) { | |
1748 | virtio_irq(vq); | |
1749 | } | |
1750 | } | |
1751 | ||
1752 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, | |
1753 | bool with_irqfd) | |
1754 | { | |
1755 | if (assign && !with_irqfd) { | |
1756 | event_notifier_set_handler(&vq->guest_notifier, | |
1757 | virtio_queue_guest_notifier_read); | |
1758 | } else { | |
1759 | event_notifier_set_handler(&vq->guest_notifier, NULL); | |
1760 | } | |
1761 | if (!assign) { | |
1762 | /* Test and clear notifier before closing it, | |
1763 | * in case poll callback didn't have time to run. */ | |
1764 | virtio_queue_guest_notifier_read(&vq->guest_notifier); | |
1765 | } | |
1766 | } | |
1767 | ||
1cbdabe2 MT |
1768 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
1769 | { | |
1770 | return &vq->guest_notifier; | |
1771 | } | |
b1f416aa PB |
1772 | |
1773 | static void virtio_queue_host_notifier_read(EventNotifier *n) | |
1774 | { | |
1775 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
1776 | if (event_notifier_test_and_clear(n)) { | |
1777 | virtio_queue_notify_vq(vq); | |
1778 | } | |
1779 | } | |
1780 | ||
26b9b5fe PB |
1781 | void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, |
1782 | bool set_handler) | |
b1f416aa | 1783 | { |
26b9b5fe | 1784 | if (assign && set_handler) { |
b1f416aa PB |
1785 | event_notifier_set_handler(&vq->host_notifier, |
1786 | virtio_queue_host_notifier_read); | |
1787 | } else { | |
1788 | event_notifier_set_handler(&vq->host_notifier, NULL); | |
26b9b5fe PB |
1789 | } |
1790 | if (!assign) { | |
b1f416aa PB |
1791 | /* Test and clear notifier before after disabling event, |
1792 | * in case poll callback didn't have time to run. */ | |
1793 | virtio_queue_host_notifier_read(&vq->host_notifier); | |
1794 | } | |
1795 | } | |
1796 | ||
1cbdabe2 MT |
1797 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
1798 | { | |
1799 | return &vq->host_notifier; | |
1800 | } | |
8e05db92 | 1801 | |
1034e9cf FK |
1802 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) |
1803 | { | |
9e288406 | 1804 | g_free(vdev->bus_name); |
80e0090a | 1805 | vdev->bus_name = g_strdup(bus_name); |
1034e9cf FK |
1806 | } |
1807 | ||
1d244b42 AF |
1808 | static void virtio_device_realize(DeviceState *dev, Error **errp) |
1809 | { | |
1810 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
1811 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
1812 | Error *err = NULL; | |
1813 | ||
1d244b42 AF |
1814 | if (vdc->realize != NULL) { |
1815 | vdc->realize(dev, &err); | |
1816 | if (err != NULL) { | |
1817 | error_propagate(errp, err); | |
1818 | return; | |
1819 | } | |
8e05db92 | 1820 | } |
e8398045 JW |
1821 | |
1822 | virtio_bus_device_plugged(vdev, &err); | |
1823 | if (err != NULL) { | |
1824 | error_propagate(errp, err); | |
1825 | return; | |
1826 | } | |
8e05db92 FK |
1827 | } |
1828 | ||
1d244b42 | 1829 | static void virtio_device_unrealize(DeviceState *dev, Error **errp) |
1034e9cf | 1830 | { |
1d244b42 | 1831 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
306ec6c3 AF |
1832 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
1833 | Error *err = NULL; | |
1d244b42 | 1834 | |
83d07047 PB |
1835 | virtio_bus_device_unplugged(vdev); |
1836 | ||
306ec6c3 AF |
1837 | if (vdc->unrealize != NULL) { |
1838 | vdc->unrealize(dev, &err); | |
1839 | if (err != NULL) { | |
1840 | error_propagate(errp, err); | |
1841 | return; | |
1842 | } | |
5e96f5d2 | 1843 | } |
1d244b42 | 1844 | |
9e288406 MA |
1845 | g_free(vdev->bus_name); |
1846 | vdev->bus_name = NULL; | |
1034e9cf FK |
1847 | } |
1848 | ||
6b8f1020 CH |
1849 | static Property virtio_properties[] = { |
1850 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), | |
1851 | DEFINE_PROP_END_OF_LIST(), | |
1852 | }; | |
1853 | ||
8e05db92 FK |
1854 | static void virtio_device_class_init(ObjectClass *klass, void *data) |
1855 | { | |
1856 | /* Set the default value here. */ | |
1857 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1d244b42 AF |
1858 | |
1859 | dc->realize = virtio_device_realize; | |
1860 | dc->unrealize = virtio_device_unrealize; | |
8e05db92 | 1861 | dc->bus_type = TYPE_VIRTIO_BUS; |
6b8f1020 | 1862 | dc->props = virtio_properties; |
8e05db92 FK |
1863 | } |
1864 | ||
1865 | static const TypeInfo virtio_device_info = { | |
1866 | .name = TYPE_VIRTIO_DEVICE, | |
1867 | .parent = TYPE_DEVICE, | |
1868 | .instance_size = sizeof(VirtIODevice), | |
1869 | .class_init = virtio_device_class_init, | |
1870 | .abstract = true, | |
1871 | .class_size = sizeof(VirtioDeviceClass), | |
1872 | }; | |
1873 | ||
1874 | static void virtio_register_types(void) | |
1875 | { | |
1876 | type_register_static(&virtio_device_info); | |
1877 | } | |
1878 | ||
1879 | type_init(virtio_register_types) |