]>
Commit | Line | Data |
---|---|---|
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 | 16 | #include "cpu.h" |
64979a4d | 17 | #include "trace.h" |
fdfba1a2 | 18 | #include "exec/address-spaces.h" |
1de7afc9 | 19 | #include "qemu/error-report.h" |
d68cdae3 | 20 | #include "qemu/log.h" |
db725815 | 21 | #include "qemu/main-loop.h" |
0b8fa32f | 22 | #include "qemu/module.h" |
0d09e41a | 23 | #include "hw/virtio/virtio.h" |
ca77ee28 | 24 | #include "migration/qemu-file-types.h" |
1de7afc9 | 25 | #include "qemu/atomic.h" |
0d09e41a | 26 | #include "hw/virtio/virtio-bus.h" |
a27bd6c7 | 27 | #include "hw/qdev-properties.h" |
cee3ca00 | 28 | #include "hw/virtio/virtio-access.h" |
8607f5c3 | 29 | #include "sysemu/dma.h" |
54d31236 | 30 | #include "sysemu/runstate.h" |
7c78bdd7 | 31 | #include "standard-headers/linux/virtio_ids.h" |
967f97fa | 32 | |
6ce69d1c PM |
33 | /* |
34 | * The alignment to use between consumer and producer parts of vring. | |
35 | * x86 pagesize again. This is the default, used by transports like PCI | |
36 | * which don't provide a means for the guest to tell the host the alignment. | |
37 | */ | |
f46f15bc AL |
38 | #define VIRTIO_PCI_VRING_ALIGN 4096 |
39 | ||
967f97fa AL |
40 | typedef struct VRingDesc |
41 | { | |
42 | uint64_t addr; | |
43 | uint32_t len; | |
44 | uint16_t flags; | |
45 | uint16_t next; | |
46 | } VRingDesc; | |
47 | ||
a40dcec9 WX |
48 | typedef struct VRingPackedDesc { |
49 | uint64_t addr; | |
50 | uint32_t len; | |
51 | uint16_t id; | |
52 | uint16_t flags; | |
53 | } VRingPackedDesc; | |
54 | ||
967f97fa AL |
55 | typedef struct VRingAvail |
56 | { | |
57 | uint16_t flags; | |
58 | uint16_t idx; | |
f7795e40 | 59 | uint16_t ring[]; |
967f97fa AL |
60 | } VRingAvail; |
61 | ||
62 | typedef struct VRingUsedElem | |
63 | { | |
64 | uint32_t id; | |
65 | uint32_t len; | |
66 | } VRingUsedElem; | |
67 | ||
68 | typedef struct VRingUsed | |
69 | { | |
70 | uint16_t flags; | |
71 | uint16_t idx; | |
f7795e40 | 72 | VRingUsedElem ring[]; |
967f97fa AL |
73 | } VRingUsed; |
74 | ||
c611c764 PB |
75 | typedef struct VRingMemoryRegionCaches { |
76 | struct rcu_head rcu; | |
77 | MemoryRegionCache desc; | |
78 | MemoryRegionCache avail; | |
79 | MemoryRegionCache used; | |
80 | } VRingMemoryRegionCaches; | |
81 | ||
967f97fa AL |
82 | typedef struct VRing |
83 | { | |
84 | unsigned int num; | |
46c5d082 | 85 | unsigned int num_default; |
6ce69d1c | 86 | unsigned int align; |
a8170e5e AK |
87 | hwaddr desc; |
88 | hwaddr avail; | |
89 | hwaddr used; | |
c611c764 | 90 | VRingMemoryRegionCaches *caches; |
967f97fa AL |
91 | } VRing; |
92 | ||
a40dcec9 WX |
93 | typedef struct VRingPackedDescEvent { |
94 | uint16_t off_wrap; | |
95 | uint16_t flags; | |
96 | } VRingPackedDescEvent ; | |
97 | ||
967f97fa AL |
98 | struct VirtQueue |
99 | { | |
100 | VRing vring; | |
86044b24 | 101 | VirtQueueElement *used_elems; |
be1fea9b VM |
102 | |
103 | /* Next head to pop */ | |
967f97fa | 104 | uint16_t last_avail_idx; |
a40dcec9 | 105 | bool last_avail_wrap_counter; |
b796fcd1 | 106 | |
be1fea9b VM |
107 | /* Last avail_idx read from VQ. */ |
108 | uint16_t shadow_avail_idx; | |
a40dcec9 | 109 | bool shadow_avail_wrap_counter; |
be1fea9b | 110 | |
b796fcd1 | 111 | uint16_t used_idx; |
a40dcec9 | 112 | bool used_wrap_counter; |
b796fcd1 | 113 | |
bcbabae8 MT |
114 | /* Last used index value we have signalled on */ |
115 | uint16_t signalled_used; | |
116 | ||
117 | /* Last used index value we have signalled on */ | |
118 | bool signalled_used_valid; | |
119 | ||
332fa82d SH |
120 | /* Notification enabled? */ |
121 | bool notification; | |
bcbabae8 | 122 | |
e78a2b42 JW |
123 | uint16_t queue_index; |
124 | ||
e66bcc40 | 125 | unsigned int inuse; |
bcbabae8 | 126 | |
7055e687 | 127 | uint16_t vector; |
bf1780b0 | 128 | VirtIOHandleOutput handle_output; |
07931698 | 129 | VirtIOHandleAIOOutput handle_aio_output; |
1cbdabe2 MT |
130 | VirtIODevice *vdev; |
131 | EventNotifier guest_notifier; | |
132 | EventNotifier host_notifier; | |
fcccb271 | 133 | bool host_notifier_enabled; |
e0d686bf | 134 | QLIST_ENTRY(VirtQueue) node; |
967f97fa AL |
135 | }; |
136 | ||
c611c764 PB |
137 | static void virtio_free_region_cache(VRingMemoryRegionCaches *caches) |
138 | { | |
139 | if (!caches) { | |
140 | return; | |
141 | } | |
142 | ||
143 | address_space_cache_destroy(&caches->desc); | |
144 | address_space_cache_destroy(&caches->avail); | |
145 | address_space_cache_destroy(&caches->used); | |
146 | g_free(caches); | |
147 | } | |
148 | ||
45641dba PB |
149 | static void virtio_virtqueue_reset_region_cache(struct VirtQueue *vq) |
150 | { | |
151 | VRingMemoryRegionCaches *caches; | |
152 | ||
d73415a3 SH |
153 | caches = qatomic_read(&vq->vring.caches); |
154 | qatomic_rcu_set(&vq->vring.caches, NULL); | |
45641dba PB |
155 | if (caches) { |
156 | call_rcu(caches, virtio_free_region_cache, rcu); | |
157 | } | |
158 | } | |
159 | ||
c611c764 PB |
160 | static void virtio_init_region_cache(VirtIODevice *vdev, int n) |
161 | { | |
162 | VirtQueue *vq = &vdev->vq[n]; | |
163 | VRingMemoryRegionCaches *old = vq->vring.caches; | |
45641dba | 164 | VRingMemoryRegionCaches *new = NULL; |
c611c764 | 165 | hwaddr addr, size; |
e45da653 | 166 | int64_t len; |
86044b24 | 167 | bool packed; |
c611c764 | 168 | |
c611c764 PB |
169 | |
170 | addr = vq->vring.desc; | |
171 | if (!addr) { | |
45641dba | 172 | goto out_no_cache; |
c611c764 PB |
173 | } |
174 | new = g_new0(VRingMemoryRegionCaches, 1); | |
175 | size = virtio_queue_get_desc_size(vdev, n); | |
86044b24 JW |
176 | packed = virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED) ? |
177 | true : false; | |
e45da653 | 178 | len = address_space_cache_init(&new->desc, vdev->dma_as, |
86044b24 | 179 | addr, size, packed); |
e45da653 JW |
180 | if (len < size) { |
181 | virtio_error(vdev, "Cannot map desc"); | |
182 | goto err_desc; | |
183 | } | |
c611c764 | 184 | |
f90cda63 | 185 | size = virtio_queue_get_used_size(vdev, n); |
e45da653 JW |
186 | len = address_space_cache_init(&new->used, vdev->dma_as, |
187 | vq->vring.used, size, true); | |
188 | if (len < size) { | |
189 | virtio_error(vdev, "Cannot map used"); | |
190 | goto err_used; | |
191 | } | |
c611c764 | 192 | |
f90cda63 | 193 | size = virtio_queue_get_avail_size(vdev, n); |
e45da653 JW |
194 | len = address_space_cache_init(&new->avail, vdev->dma_as, |
195 | vq->vring.avail, size, false); | |
196 | if (len < size) { | |
197 | virtio_error(vdev, "Cannot map avail"); | |
198 | goto err_avail; | |
199 | } | |
c611c764 | 200 | |
d73415a3 | 201 | qatomic_rcu_set(&vq->vring.caches, new); |
c611c764 PB |
202 | if (old) { |
203 | call_rcu(old, virtio_free_region_cache, rcu); | |
204 | } | |
e45da653 JW |
205 | return; |
206 | ||
207 | err_avail: | |
45641dba | 208 | address_space_cache_destroy(&new->avail); |
e45da653 | 209 | err_used: |
45641dba | 210 | address_space_cache_destroy(&new->used); |
e45da653 | 211 | err_desc: |
45641dba PB |
212 | address_space_cache_destroy(&new->desc); |
213 | out_no_cache: | |
e45da653 | 214 | g_free(new); |
45641dba | 215 | virtio_virtqueue_reset_region_cache(vq); |
c611c764 PB |
216 | } |
217 | ||
967f97fa | 218 | /* virt queue functions */ |
ab223c95 | 219 | void virtio_queue_update_rings(VirtIODevice *vdev, int n) |
967f97fa | 220 | { |
ab223c95 | 221 | VRing *vring = &vdev->vq[n].vring; |
53c25cea | 222 | |
758ead31 | 223 | if (!vring->num || !vring->desc || !vring->align) { |
ab223c95 CH |
224 | /* not yet setup -> nothing to do */ |
225 | return; | |
226 | } | |
227 | vring->avail = vring->desc + vring->num * sizeof(VRingDesc); | |
228 | vring->used = vring_align(vring->avail + | |
229 | offsetof(VRingAvail, ring[vring->num]), | |
230 | vring->align); | |
c611c764 | 231 | virtio_init_region_cache(vdev, n); |
967f97fa AL |
232 | } |
233 | ||
97cd965c | 234 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
235 | static void vring_split_desc_read(VirtIODevice *vdev, VRingDesc *desc, |
236 | MemoryRegionCache *cache, int i) | |
967f97fa | 237 | { |
5eba0404 PB |
238 | address_space_read_cached(cache, i * sizeof(VRingDesc), |
239 | desc, sizeof(VRingDesc)); | |
aa570d6f PB |
240 | virtio_tswap64s(vdev, &desc->addr); |
241 | virtio_tswap32s(vdev, &desc->len); | |
242 | virtio_tswap16s(vdev, &desc->flags); | |
243 | virtio_tswap16s(vdev, &desc->next); | |
967f97fa AL |
244 | } |
245 | ||
683f7665 JW |
246 | static void vring_packed_event_read(VirtIODevice *vdev, |
247 | MemoryRegionCache *cache, | |
248 | VRingPackedDescEvent *e) | |
249 | { | |
250 | hwaddr off_off = offsetof(VRingPackedDescEvent, off_wrap); | |
251 | hwaddr off_flags = offsetof(VRingPackedDescEvent, flags); | |
252 | ||
253 | address_space_read_cached(cache, off_flags, &e->flags, | |
254 | sizeof(e->flags)); | |
255 | /* Make sure flags is seen before off_wrap */ | |
256 | smp_rmb(); | |
257 | address_space_read_cached(cache, off_off, &e->off_wrap, | |
258 | sizeof(e->off_wrap)); | |
259 | virtio_tswap16s(vdev, &e->off_wrap); | |
260 | virtio_tswap16s(vdev, &e->flags); | |
261 | } | |
262 | ||
263 | static void vring_packed_off_wrap_write(VirtIODevice *vdev, | |
264 | MemoryRegionCache *cache, | |
265 | uint16_t off_wrap) | |
266 | { | |
267 | hwaddr off = offsetof(VRingPackedDescEvent, off_wrap); | |
268 | ||
269 | virtio_tswap16s(vdev, &off_wrap); | |
270 | address_space_write_cached(cache, off, &off_wrap, sizeof(off_wrap)); | |
271 | address_space_cache_invalidate(cache, off, sizeof(off_wrap)); | |
272 | } | |
273 | ||
274 | static void vring_packed_flags_write(VirtIODevice *vdev, | |
275 | MemoryRegionCache *cache, uint16_t flags) | |
276 | { | |
277 | hwaddr off = offsetof(VRingPackedDescEvent, flags); | |
278 | ||
279 | virtio_tswap16s(vdev, &flags); | |
280 | address_space_write_cached(cache, off, &flags, sizeof(flags)); | |
281 | address_space_cache_invalidate(cache, off, sizeof(flags)); | |
282 | } | |
283 | ||
86044b24 | 284 | /* Called within rcu_read_lock(). */ |
e0e2d644 JW |
285 | static VRingMemoryRegionCaches *vring_get_region_caches(struct VirtQueue *vq) |
286 | { | |
d73415a3 | 287 | return qatomic_rcu_read(&vq->vring.caches); |
e0e2d644 | 288 | } |
abdd16f4 | 289 | |
97cd965c | 290 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
291 | static inline uint16_t vring_avail_flags(VirtQueue *vq) |
292 | { | |
e0e2d644 | 293 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 294 | hwaddr pa = offsetof(VRingAvail, flags); |
abdd16f4 SH |
295 | |
296 | if (!caches) { | |
297 | return 0; | |
298 | } | |
299 | ||
97cd965c | 300 | return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
967f97fa AL |
301 | } |
302 | ||
97cd965c | 303 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
304 | static inline uint16_t vring_avail_idx(VirtQueue *vq) |
305 | { | |
e0e2d644 | 306 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 307 | hwaddr pa = offsetof(VRingAvail, idx); |
abdd16f4 SH |
308 | |
309 | if (!caches) { | |
310 | return 0; | |
311 | } | |
312 | ||
97cd965c | 313 | vq->shadow_avail_idx = virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
be1fea9b | 314 | return vq->shadow_avail_idx; |
967f97fa AL |
315 | } |
316 | ||
97cd965c | 317 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
318 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
319 | { | |
e0e2d644 | 320 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 321 | hwaddr pa = offsetof(VRingAvail, ring[i]); |
abdd16f4 SH |
322 | |
323 | if (!caches) { | |
324 | return 0; | |
325 | } | |
326 | ||
97cd965c | 327 | return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
967f97fa AL |
328 | } |
329 | ||
97cd965c | 330 | /* Called within rcu_read_lock(). */ |
e9600c6c | 331 | static inline uint16_t vring_get_used_event(VirtQueue *vq) |
bcbabae8 MT |
332 | { |
333 | return vring_avail_ring(vq, vq->vring.num); | |
334 | } | |
335 | ||
97cd965c | 336 | /* Called within rcu_read_lock(). */ |
1cdd2ee5 VM |
337 | static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem, |
338 | int i) | |
967f97fa | 339 | { |
e0e2d644 | 340 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 341 | hwaddr pa = offsetof(VRingUsed, ring[i]); |
abdd16f4 SH |
342 | |
343 | if (!caches) { | |
344 | return; | |
345 | } | |
346 | ||
1cdd2ee5 VM |
347 | virtio_tswap32s(vq->vdev, &uelem->id); |
348 | virtio_tswap32s(vq->vdev, &uelem->len); | |
97cd965c PB |
349 | address_space_write_cached(&caches->used, pa, uelem, sizeof(VRingUsedElem)); |
350 | address_space_cache_invalidate(&caches->used, pa, sizeof(VRingUsedElem)); | |
967f97fa AL |
351 | } |
352 | ||
97cd965c | 353 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
354 | static uint16_t vring_used_idx(VirtQueue *vq) |
355 | { | |
e0e2d644 | 356 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 357 | hwaddr pa = offsetof(VRingUsed, idx); |
abdd16f4 SH |
358 | |
359 | if (!caches) { | |
360 | return 0; | |
361 | } | |
362 | ||
97cd965c | 363 | return virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); |
967f97fa AL |
364 | } |
365 | ||
97cd965c | 366 | /* Called within rcu_read_lock(). */ |
bcbabae8 | 367 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
967f97fa | 368 | { |
e0e2d644 | 369 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 370 | hwaddr pa = offsetof(VRingUsed, idx); |
abdd16f4 SH |
371 | |
372 | if (caches) { | |
373 | virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); | |
374 | address_space_cache_invalidate(&caches->used, pa, sizeof(val)); | |
375 | } | |
376 | ||
b796fcd1 | 377 | vq->used_idx = val; |
967f97fa AL |
378 | } |
379 | ||
97cd965c | 380 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
381 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
382 | { | |
e0e2d644 | 383 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
cee3ca00 | 384 | VirtIODevice *vdev = vq->vdev; |
97cd965c | 385 | hwaddr pa = offsetof(VRingUsed, flags); |
abdd16f4 | 386 | uint16_t flags; |
97cd965c | 387 | |
abdd16f4 SH |
388 | if (!caches) { |
389 | return; | |
390 | } | |
391 | ||
392 | flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); | |
97cd965c PB |
393 | virtio_stw_phys_cached(vdev, &caches->used, pa, flags | mask); |
394 | address_space_cache_invalidate(&caches->used, pa, sizeof(flags)); | |
967f97fa AL |
395 | } |
396 | ||
97cd965c | 397 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
398 | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
399 | { | |
e0e2d644 | 400 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
cee3ca00 | 401 | VirtIODevice *vdev = vq->vdev; |
97cd965c | 402 | hwaddr pa = offsetof(VRingUsed, flags); |
abdd16f4 | 403 | uint16_t flags; |
97cd965c | 404 | |
abdd16f4 SH |
405 | if (!caches) { |
406 | return; | |
407 | } | |
408 | ||
409 | flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); | |
97cd965c PB |
410 | virtio_stw_phys_cached(vdev, &caches->used, pa, flags & ~mask); |
411 | address_space_cache_invalidate(&caches->used, pa, sizeof(flags)); | |
967f97fa AL |
412 | } |
413 | ||
97cd965c | 414 | /* Called within rcu_read_lock(). */ |
e9600c6c | 415 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) |
bcbabae8 | 416 | { |
97cd965c | 417 | VRingMemoryRegionCaches *caches; |
a8170e5e | 418 | hwaddr pa; |
332fa82d | 419 | if (!vq->notification) { |
bcbabae8 MT |
420 | return; |
421 | } | |
97cd965c | 422 | |
e0e2d644 | 423 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
424 | if (!caches) { |
425 | return; | |
426 | } | |
427 | ||
97cd965c PB |
428 | pa = offsetof(VRingUsed, ring[vq->vring.num]); |
429 | virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); | |
3cdf8473 | 430 | address_space_cache_invalidate(&caches->used, pa, sizeof(val)); |
bcbabae8 MT |
431 | } |
432 | ||
683f7665 | 433 | static void virtio_queue_split_set_notification(VirtQueue *vq, int enable) |
967f97fa | 434 | { |
b5f53d04 DDAG |
435 | RCU_READ_LOCK_GUARD(); |
436 | ||
95129d6f | 437 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 438 | vring_set_avail_event(vq, vring_avail_idx(vq)); |
bcbabae8 | 439 | } else if (enable) { |
967f97fa | 440 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 441 | } else { |
967f97fa | 442 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 443 | } |
92045d80 MT |
444 | if (enable) { |
445 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
446 | smp_mb(); | |
447 | } | |
967f97fa AL |
448 | } |
449 | ||
683f7665 JW |
450 | static void virtio_queue_packed_set_notification(VirtQueue *vq, int enable) |
451 | { | |
452 | uint16_t off_wrap; | |
453 | VRingPackedDescEvent e; | |
454 | VRingMemoryRegionCaches *caches; | |
455 | ||
b5f53d04 | 456 | RCU_READ_LOCK_GUARD(); |
abdd16f4 SH |
457 | caches = vring_get_region_caches(vq); |
458 | if (!caches) { | |
459 | return; | |
460 | } | |
461 | ||
683f7665 JW |
462 | vring_packed_event_read(vq->vdev, &caches->used, &e); |
463 | ||
464 | if (!enable) { | |
465 | e.flags = VRING_PACKED_EVENT_FLAG_DISABLE; | |
466 | } else if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { | |
467 | off_wrap = vq->shadow_avail_idx | vq->shadow_avail_wrap_counter << 15; | |
468 | vring_packed_off_wrap_write(vq->vdev, &caches->used, off_wrap); | |
469 | /* Make sure off_wrap is wrote before flags */ | |
470 | smp_wmb(); | |
471 | e.flags = VRING_PACKED_EVENT_FLAG_DESC; | |
472 | } else { | |
473 | e.flags = VRING_PACKED_EVENT_FLAG_ENABLE; | |
474 | } | |
475 | ||
476 | vring_packed_flags_write(vq->vdev, &caches->used, e.flags); | |
477 | if (enable) { | |
478 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
479 | smp_mb(); | |
480 | } | |
683f7665 JW |
481 | } |
482 | ||
d0435bc5 SH |
483 | bool virtio_queue_get_notification(VirtQueue *vq) |
484 | { | |
485 | return vq->notification; | |
486 | } | |
487 | ||
683f7665 JW |
488 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
489 | { | |
490 | vq->notification = enable; | |
491 | ||
492 | if (!vq->vring.desc) { | |
493 | return; | |
494 | } | |
495 | ||
496 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
497 | virtio_queue_packed_set_notification(vq, enable); | |
498 | } else { | |
499 | virtio_queue_split_set_notification(vq, enable); | |
500 | } | |
501 | } | |
502 | ||
967f97fa AL |
503 | int virtio_queue_ready(VirtQueue *vq) |
504 | { | |
505 | return vq->vring.avail != 0; | |
506 | } | |
507 | ||
86044b24 JW |
508 | static void vring_packed_desc_read_flags(VirtIODevice *vdev, |
509 | uint16_t *flags, | |
510 | MemoryRegionCache *cache, | |
511 | int i) | |
512 | { | |
513 | address_space_read_cached(cache, | |
514 | i * sizeof(VRingPackedDesc) + | |
515 | offsetof(VRingPackedDesc, flags), | |
516 | flags, sizeof(*flags)); | |
517 | virtio_tswap16s(vdev, flags); | |
518 | } | |
519 | ||
520 | static void vring_packed_desc_read(VirtIODevice *vdev, | |
521 | VRingPackedDesc *desc, | |
522 | MemoryRegionCache *cache, | |
523 | int i, bool strict_order) | |
524 | { | |
525 | hwaddr off = i * sizeof(VRingPackedDesc); | |
526 | ||
527 | vring_packed_desc_read_flags(vdev, &desc->flags, cache, i); | |
528 | ||
529 | if (strict_order) { | |
530 | /* Make sure flags is read before the rest fields. */ | |
531 | smp_rmb(); | |
532 | } | |
533 | ||
534 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, addr), | |
535 | &desc->addr, sizeof(desc->addr)); | |
536 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, id), | |
537 | &desc->id, sizeof(desc->id)); | |
538 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, len), | |
539 | &desc->len, sizeof(desc->len)); | |
540 | virtio_tswap64s(vdev, &desc->addr); | |
541 | virtio_tswap16s(vdev, &desc->id); | |
542 | virtio_tswap32s(vdev, &desc->len); | |
543 | } | |
544 | ||
545 | static void vring_packed_desc_write_data(VirtIODevice *vdev, | |
546 | VRingPackedDesc *desc, | |
547 | MemoryRegionCache *cache, | |
548 | int i) | |
549 | { | |
550 | hwaddr off_id = i * sizeof(VRingPackedDesc) + | |
551 | offsetof(VRingPackedDesc, id); | |
552 | hwaddr off_len = i * sizeof(VRingPackedDesc) + | |
553 | offsetof(VRingPackedDesc, len); | |
554 | ||
555 | virtio_tswap32s(vdev, &desc->len); | |
556 | virtio_tswap16s(vdev, &desc->id); | |
557 | address_space_write_cached(cache, off_id, &desc->id, sizeof(desc->id)); | |
558 | address_space_cache_invalidate(cache, off_id, sizeof(desc->id)); | |
559 | address_space_write_cached(cache, off_len, &desc->len, sizeof(desc->len)); | |
560 | address_space_cache_invalidate(cache, off_len, sizeof(desc->len)); | |
561 | } | |
562 | ||
563 | static void vring_packed_desc_write_flags(VirtIODevice *vdev, | |
564 | VRingPackedDesc *desc, | |
565 | MemoryRegionCache *cache, | |
566 | int i) | |
567 | { | |
568 | hwaddr off = i * sizeof(VRingPackedDesc) + offsetof(VRingPackedDesc, flags); | |
569 | ||
570 | virtio_tswap16s(vdev, &desc->flags); | |
571 | address_space_write_cached(cache, off, &desc->flags, sizeof(desc->flags)); | |
572 | address_space_cache_invalidate(cache, off, sizeof(desc->flags)); | |
573 | } | |
574 | ||
575 | static void vring_packed_desc_write(VirtIODevice *vdev, | |
576 | VRingPackedDesc *desc, | |
577 | MemoryRegionCache *cache, | |
578 | int i, bool strict_order) | |
579 | { | |
580 | vring_packed_desc_write_data(vdev, desc, cache, i); | |
581 | if (strict_order) { | |
582 | /* Make sure data is wrote before flags. */ | |
583 | smp_wmb(); | |
584 | } | |
585 | vring_packed_desc_write_flags(vdev, desc, cache, i); | |
586 | } | |
587 | ||
588 | static inline bool is_desc_avail(uint16_t flags, bool wrap_counter) | |
589 | { | |
590 | bool avail, used; | |
591 | ||
592 | avail = !!(flags & (1 << VRING_PACKED_DESC_F_AVAIL)); | |
593 | used = !!(flags & (1 << VRING_PACKED_DESC_F_USED)); | |
594 | return (avail != used) && (avail == wrap_counter); | |
595 | } | |
596 | ||
be1fea9b | 597 | /* Fetch avail_idx from VQ memory only when we really need to know if |
97cd965c PB |
598 | * guest has added some buffers. |
599 | * Called within rcu_read_lock(). */ | |
600 | static int virtio_queue_empty_rcu(VirtQueue *vq) | |
967f97fa | 601 | { |
9d7bd082 | 602 | if (virtio_device_disabled(vq->vdev)) { |
2d1df859 FZ |
603 | return 1; |
604 | } | |
605 | ||
168e4af3 JW |
606 | if (unlikely(!vq->vring.avail)) { |
607 | return 1; | |
608 | } | |
609 | ||
be1fea9b VM |
610 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
611 | return 0; | |
612 | } | |
613 | ||
967f97fa AL |
614 | return vring_avail_idx(vq) == vq->last_avail_idx; |
615 | } | |
616 | ||
86044b24 | 617 | static int virtio_queue_split_empty(VirtQueue *vq) |
97cd965c PB |
618 | { |
619 | bool empty; | |
620 | ||
9d7bd082 | 621 | if (virtio_device_disabled(vq->vdev)) { |
2d1df859 FZ |
622 | return 1; |
623 | } | |
624 | ||
168e4af3 JW |
625 | if (unlikely(!vq->vring.avail)) { |
626 | return 1; | |
627 | } | |
628 | ||
97cd965c PB |
629 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
630 | return 0; | |
631 | } | |
632 | ||
b5f53d04 | 633 | RCU_READ_LOCK_GUARD(); |
97cd965c | 634 | empty = vring_avail_idx(vq) == vq->last_avail_idx; |
97cd965c PB |
635 | return empty; |
636 | } | |
637 | ||
86044b24 JW |
638 | static int virtio_queue_packed_empty_rcu(VirtQueue *vq) |
639 | { | |
640 | struct VRingPackedDesc desc; | |
641 | VRingMemoryRegionCaches *cache; | |
642 | ||
643 | if (unlikely(!vq->vring.desc)) { | |
644 | return 1; | |
645 | } | |
646 | ||
647 | cache = vring_get_region_caches(vq); | |
abdd16f4 SH |
648 | if (!cache) { |
649 | return 1; | |
650 | } | |
651 | ||
86044b24 JW |
652 | vring_packed_desc_read_flags(vq->vdev, &desc.flags, &cache->desc, |
653 | vq->last_avail_idx); | |
654 | ||
655 | return !is_desc_avail(desc.flags, vq->last_avail_wrap_counter); | |
656 | } | |
657 | ||
658 | static int virtio_queue_packed_empty(VirtQueue *vq) | |
659 | { | |
b5f53d04 DDAG |
660 | RCU_READ_LOCK_GUARD(); |
661 | return virtio_queue_packed_empty_rcu(vq); | |
86044b24 JW |
662 | } |
663 | ||
664 | int virtio_queue_empty(VirtQueue *vq) | |
665 | { | |
666 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
667 | return virtio_queue_packed_empty(vq); | |
668 | } else { | |
669 | return virtio_queue_split_empty(vq); | |
670 | } | |
671 | } | |
672 | ||
ce317461 JW |
673 | static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, |
674 | unsigned int len) | |
967f97fa | 675 | { |
8607f5c3 | 676 | AddressSpace *dma_as = vq->vdev->dma_as; |
967f97fa AL |
677 | unsigned int offset; |
678 | int i; | |
679 | ||
967f97fa AL |
680 | offset = 0; |
681 | for (i = 0; i < elem->in_num; i++) { | |
682 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); | |
683 | ||
8607f5c3 JW |
684 | dma_memory_unmap(dma_as, elem->in_sg[i].iov_base, |
685 | elem->in_sg[i].iov_len, | |
686 | DMA_DIRECTION_FROM_DEVICE, size); | |
967f97fa | 687 | |
0cea71a2 | 688 | offset += size; |
967f97fa AL |
689 | } |
690 | ||
26b258e1 | 691 | for (i = 0; i < elem->out_num; i++) |
8607f5c3 JW |
692 | dma_memory_unmap(dma_as, elem->out_sg[i].iov_base, |
693 | elem->out_sg[i].iov_len, | |
694 | DMA_DIRECTION_TO_DEVICE, | |
695 | elem->out_sg[i].iov_len); | |
ce317461 JW |
696 | } |
697 | ||
2640d2a5 SH |
698 | /* virtqueue_detach_element: |
699 | * @vq: The #VirtQueue | |
700 | * @elem: The #VirtQueueElement | |
701 | * @len: number of bytes written | |
702 | * | |
703 | * Detach the element from the virtqueue. This function is suitable for device | |
704 | * reset or other situations where a #VirtQueueElement is simply freed and will | |
705 | * not be pushed or discarded. | |
706 | */ | |
707 | void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem, | |
708 | unsigned int len) | |
709 | { | |
86044b24 | 710 | vq->inuse -= elem->ndescs; |
2640d2a5 SH |
711 | virtqueue_unmap_sg(vq, elem, len); |
712 | } | |
713 | ||
86044b24 JW |
714 | static void virtqueue_split_rewind(VirtQueue *vq, unsigned int num) |
715 | { | |
716 | vq->last_avail_idx -= num; | |
717 | } | |
718 | ||
719 | static void virtqueue_packed_rewind(VirtQueue *vq, unsigned int num) | |
720 | { | |
721 | if (vq->last_avail_idx < num) { | |
722 | vq->last_avail_idx = vq->vring.num + vq->last_avail_idx - num; | |
723 | vq->last_avail_wrap_counter ^= 1; | |
724 | } else { | |
725 | vq->last_avail_idx -= num; | |
726 | } | |
727 | } | |
728 | ||
27e57efe | 729 | /* virtqueue_unpop: |
2640d2a5 SH |
730 | * @vq: The #VirtQueue |
731 | * @elem: The #VirtQueueElement | |
732 | * @len: number of bytes written | |
733 | * | |
734 | * Pretend the most recent element wasn't popped from the virtqueue. The next | |
735 | * call to virtqueue_pop() will refetch the element. | |
736 | */ | |
27e57efe LP |
737 | void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem, |
738 | unsigned int len) | |
29b9f5ef | 739 | { |
86044b24 JW |
740 | |
741 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
742 | virtqueue_packed_rewind(vq, 1); | |
743 | } else { | |
744 | virtqueue_split_rewind(vq, 1); | |
745 | } | |
746 | ||
2640d2a5 | 747 | virtqueue_detach_element(vq, elem, len); |
29b9f5ef JW |
748 | } |
749 | ||
297a75e6 SH |
750 | /* virtqueue_rewind: |
751 | * @vq: The #VirtQueue | |
752 | * @num: Number of elements to push back | |
753 | * | |
754 | * Pretend that elements weren't popped from the virtqueue. The next | |
755 | * virtqueue_pop() will refetch the oldest element. | |
756 | * | |
27e57efe | 757 | * Use virtqueue_unpop() instead if you have a VirtQueueElement. |
297a75e6 SH |
758 | * |
759 | * Returns: true on success, false if @num is greater than the number of in use | |
760 | * elements. | |
761 | */ | |
762 | bool virtqueue_rewind(VirtQueue *vq, unsigned int num) | |
763 | { | |
764 | if (num > vq->inuse) { | |
765 | return false; | |
766 | } | |
86044b24 | 767 | |
297a75e6 | 768 | vq->inuse -= num; |
86044b24 JW |
769 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
770 | virtqueue_packed_rewind(vq, num); | |
771 | } else { | |
772 | virtqueue_split_rewind(vq, num); | |
773 | } | |
297a75e6 SH |
774 | return true; |
775 | } | |
776 | ||
86044b24 | 777 | static void virtqueue_split_fill(VirtQueue *vq, const VirtQueueElement *elem, |
ce317461 JW |
778 | unsigned int len, unsigned int idx) |
779 | { | |
1cdd2ee5 VM |
780 | VRingUsedElem uelem; |
781 | ||
168e4af3 JW |
782 | if (unlikely(!vq->vring.used)) { |
783 | return; | |
784 | } | |
785 | ||
b796fcd1 | 786 | idx = (idx + vq->used_idx) % vq->vring.num; |
967f97fa | 787 | |
1cdd2ee5 VM |
788 | uelem.id = elem->index; |
789 | uelem.len = len; | |
790 | vring_used_write(vq, &uelem, idx); | |
967f97fa AL |
791 | } |
792 | ||
86044b24 JW |
793 | static void virtqueue_packed_fill(VirtQueue *vq, const VirtQueueElement *elem, |
794 | unsigned int len, unsigned int idx) | |
795 | { | |
796 | vq->used_elems[idx].index = elem->index; | |
797 | vq->used_elems[idx].len = len; | |
798 | vq->used_elems[idx].ndescs = elem->ndescs; | |
799 | } | |
800 | ||
801 | static void virtqueue_packed_fill_desc(VirtQueue *vq, | |
802 | const VirtQueueElement *elem, | |
803 | unsigned int idx, | |
804 | bool strict_order) | |
805 | { | |
806 | uint16_t head; | |
807 | VRingMemoryRegionCaches *caches; | |
808 | VRingPackedDesc desc = { | |
809 | .id = elem->index, | |
810 | .len = elem->len, | |
811 | }; | |
812 | bool wrap_counter = vq->used_wrap_counter; | |
813 | ||
814 | if (unlikely(!vq->vring.desc)) { | |
815 | return; | |
816 | } | |
817 | ||
818 | head = vq->used_idx + idx; | |
819 | if (head >= vq->vring.num) { | |
820 | head -= vq->vring.num; | |
821 | wrap_counter ^= 1; | |
822 | } | |
823 | if (wrap_counter) { | |
824 | desc.flags |= (1 << VRING_PACKED_DESC_F_AVAIL); | |
825 | desc.flags |= (1 << VRING_PACKED_DESC_F_USED); | |
826 | } else { | |
827 | desc.flags &= ~(1 << VRING_PACKED_DESC_F_AVAIL); | |
828 | desc.flags &= ~(1 << VRING_PACKED_DESC_F_USED); | |
829 | } | |
830 | ||
831 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
832 | if (!caches) { |
833 | return; | |
834 | } | |
835 | ||
86044b24 JW |
836 | vring_packed_desc_write(vq->vdev, &desc, &caches->desc, head, strict_order); |
837 | } | |
838 | ||
97cd965c | 839 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
840 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
841 | unsigned int len, unsigned int idx) | |
967f97fa | 842 | { |
86044b24 JW |
843 | trace_virtqueue_fill(vq, elem, len, idx); |
844 | ||
845 | virtqueue_unmap_sg(vq, elem, len); | |
f5ed3663 | 846 | |
9d7bd082 | 847 | if (virtio_device_disabled(vq->vdev)) { |
f5ed3663 SH |
848 | return; |
849 | } | |
850 | ||
86044b24 JW |
851 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
852 | virtqueue_packed_fill(vq, elem, len, idx); | |
853 | } else { | |
854 | virtqueue_split_fill(vq, elem, len, idx); | |
855 | } | |
856 | } | |
857 | ||
858 | /* Called within rcu_read_lock(). */ | |
859 | static void virtqueue_split_flush(VirtQueue *vq, unsigned int count) | |
860 | { | |
861 | uint16_t old, new; | |
862 | ||
168e4af3 JW |
863 | if (unlikely(!vq->vring.used)) { |
864 | return; | |
865 | } | |
866 | ||
967f97fa | 867 | /* Make sure buffer is written before we update index. */ |
b90d2f35 | 868 | smp_wmb(); |
64979a4d | 869 | trace_virtqueue_flush(vq, count); |
b796fcd1 | 870 | old = vq->used_idx; |
bcbabae8 MT |
871 | new = old + count; |
872 | vring_used_idx_set(vq, new); | |
967f97fa | 873 | vq->inuse -= count; |
bcbabae8 MT |
874 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) |
875 | vq->signalled_used_valid = false; | |
967f97fa AL |
876 | } |
877 | ||
86044b24 JW |
878 | static void virtqueue_packed_flush(VirtQueue *vq, unsigned int count) |
879 | { | |
880 | unsigned int i, ndescs = 0; | |
881 | ||
882 | if (unlikely(!vq->vring.desc)) { | |
883 | return; | |
884 | } | |
885 | ||
886 | for (i = 1; i < count; i++) { | |
887 | virtqueue_packed_fill_desc(vq, &vq->used_elems[i], i, false); | |
888 | ndescs += vq->used_elems[i].ndescs; | |
889 | } | |
890 | virtqueue_packed_fill_desc(vq, &vq->used_elems[0], 0, true); | |
891 | ndescs += vq->used_elems[0].ndescs; | |
892 | ||
893 | vq->inuse -= ndescs; | |
894 | vq->used_idx += ndescs; | |
895 | if (vq->used_idx >= vq->vring.num) { | |
896 | vq->used_idx -= vq->vring.num; | |
897 | vq->used_wrap_counter ^= 1; | |
898 | } | |
899 | } | |
900 | ||
901 | void virtqueue_flush(VirtQueue *vq, unsigned int count) | |
902 | { | |
9d7bd082 | 903 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
904 | vq->inuse -= count; |
905 | return; | |
906 | } | |
907 | ||
908 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
909 | virtqueue_packed_flush(vq, count); | |
910 | } else { | |
911 | virtqueue_split_flush(vq, count); | |
912 | } | |
913 | } | |
914 | ||
967f97fa AL |
915 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
916 | unsigned int len) | |
917 | { | |
b5f53d04 | 918 | RCU_READ_LOCK_GUARD(); |
967f97fa AL |
919 | virtqueue_fill(vq, elem, len, 0); |
920 | virtqueue_flush(vq, 1); | |
921 | } | |
922 | ||
97cd965c | 923 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
924 | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
925 | { | |
926 | uint16_t num_heads = vring_avail_idx(vq) - idx; | |
927 | ||
928 | /* Check it isn't doing very strange things with descriptor numbers. */ | |
bb6834cf | 929 | if (num_heads > vq->vring.num) { |
4355c1ab | 930 | virtio_error(vq->vdev, "Guest moved used index from %u to %u", |
be1fea9b | 931 | idx, vq->shadow_avail_idx); |
4355c1ab | 932 | return -EINVAL; |
bb6834cf | 933 | } |
a821ce59 MT |
934 | /* On success, callers read a descriptor at vq->last_avail_idx. |
935 | * Make sure descriptor read does not bypass avail index read. */ | |
936 | if (num_heads) { | |
937 | smp_rmb(); | |
938 | } | |
967f97fa AL |
939 | |
940 | return num_heads; | |
941 | } | |
942 | ||
97cd965c | 943 | /* Called within rcu_read_lock(). */ |
fb1131b6 SH |
944 | static bool virtqueue_get_head(VirtQueue *vq, unsigned int idx, |
945 | unsigned int *head) | |
967f97fa | 946 | { |
967f97fa AL |
947 | /* Grab the next descriptor number they're advertising, and increment |
948 | * the index we've seen. */ | |
fb1131b6 | 949 | *head = vring_avail_ring(vq, idx % vq->vring.num); |
967f97fa AL |
950 | |
951 | /* If their number is silly, that's a fatal mistake. */ | |
fb1131b6 SH |
952 | if (*head >= vq->vring.num) { |
953 | virtio_error(vq->vdev, "Guest says index %u is available", *head); | |
954 | return false; | |
bb6834cf | 955 | } |
967f97fa | 956 | |
fb1131b6 | 957 | return true; |
967f97fa AL |
958 | } |
959 | ||
412e0e81 SH |
960 | enum { |
961 | VIRTQUEUE_READ_DESC_ERROR = -1, | |
962 | VIRTQUEUE_READ_DESC_DONE = 0, /* end of chain */ | |
963 | VIRTQUEUE_READ_DESC_MORE = 1, /* more buffers in chain */ | |
964 | }; | |
967f97fa | 965 | |
86044b24 JW |
966 | static int virtqueue_split_read_next_desc(VirtIODevice *vdev, VRingDesc *desc, |
967 | MemoryRegionCache *desc_cache, | |
968 | unsigned int max, unsigned int *next) | |
412e0e81 | 969 | { |
967f97fa | 970 | /* If this descriptor says it doesn't chain, we're done. */ |
aa570d6f | 971 | if (!(desc->flags & VRING_DESC_F_NEXT)) { |
412e0e81 | 972 | return VIRTQUEUE_READ_DESC_DONE; |
cee3ca00 | 973 | } |
967f97fa AL |
974 | |
975 | /* Check they're not leading us off end of descriptors. */ | |
412e0e81 | 976 | *next = desc->next; |
967f97fa | 977 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
b90d2f35 | 978 | smp_wmb(); |
967f97fa | 979 | |
412e0e81 SH |
980 | if (*next >= max) { |
981 | virtio_error(vdev, "Desc next is %u", *next); | |
982 | return VIRTQUEUE_READ_DESC_ERROR; | |
bb6834cf | 983 | } |
967f97fa | 984 | |
86044b24 | 985 | vring_split_desc_read(vdev, desc, desc_cache, *next); |
412e0e81 | 986 | return VIRTQUEUE_READ_DESC_MORE; |
967f97fa AL |
987 | } |
988 | ||
86044b24 JW |
989 | static void virtqueue_split_get_avail_bytes(VirtQueue *vq, |
990 | unsigned int *in_bytes, unsigned int *out_bytes, | |
991 | unsigned max_in_bytes, unsigned max_out_bytes) | |
967f97fa | 992 | { |
9796d0ac PB |
993 | VirtIODevice *vdev = vq->vdev; |
994 | unsigned int max, idx; | |
385ce95d | 995 | unsigned int total_bufs, in_total, out_total; |
991976f7 | 996 | VRingMemoryRegionCaches *caches; |
5eba0404 PB |
997 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
998 | int64_t len = 0; | |
412e0e81 | 999 | int rc; |
967f97fa | 1000 | |
b5f53d04 DDAG |
1001 | RCU_READ_LOCK_GUARD(); |
1002 | ||
967f97fa | 1003 | idx = vq->last_avail_idx; |
efeea6d0 | 1004 | total_bufs = in_total = out_total = 0; |
9796d0ac PB |
1005 | |
1006 | max = vq->vring.num; | |
e0e2d644 | 1007 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
1008 | if (!caches) { |
1009 | goto err; | |
1010 | } | |
1011 | ||
4355c1ab | 1012 | while ((rc = virtqueue_num_heads(vq, idx)) > 0) { |
991976f7 | 1013 | MemoryRegionCache *desc_cache = &caches->desc; |
9796d0ac | 1014 | unsigned int num_bufs; |
aa570d6f | 1015 | VRingDesc desc; |
b1c7c07f | 1016 | unsigned int i; |
967f97fa | 1017 | |
efeea6d0 | 1018 | num_bufs = total_bufs; |
fb1131b6 SH |
1019 | |
1020 | if (!virtqueue_get_head(vq, idx++, &i)) { | |
1021 | goto err; | |
1022 | } | |
1023 | ||
86044b24 | 1024 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 | 1025 | |
aa570d6f | 1026 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
74231929 | 1027 | if (!desc.len || (desc.len % sizeof(VRingDesc))) { |
d65abf85 SH |
1028 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
1029 | goto err; | |
efeea6d0 MM |
1030 | } |
1031 | ||
1032 | /* If we've got too many, that implies a descriptor loop. */ | |
1033 | if (num_bufs >= max) { | |
d65abf85 SH |
1034 | virtio_error(vdev, "Looped descriptor"); |
1035 | goto err; | |
efeea6d0 MM |
1036 | } |
1037 | ||
1038 | /* loop over the indirect descriptor table */ | |
5eba0404 PB |
1039 | len = address_space_cache_init(&indirect_desc_cache, |
1040 | vdev->dma_as, | |
1041 | desc.addr, desc.len, false); | |
1042 | desc_cache = &indirect_desc_cache; | |
9796d0ac PB |
1043 | if (len < desc.len) { |
1044 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1045 | goto err; | |
1046 | } | |
1047 | ||
aa570d6f | 1048 | max = desc.len / sizeof(VRingDesc); |
1ae2757c | 1049 | num_bufs = i = 0; |
86044b24 | 1050 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 MM |
1051 | } |
1052 | ||
967f97fa AL |
1053 | do { |
1054 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 1055 | if (++num_bufs > max) { |
d65abf85 SH |
1056 | virtio_error(vdev, "Looped descriptor"); |
1057 | goto err; | |
bb6834cf | 1058 | } |
967f97fa | 1059 | |
aa570d6f PB |
1060 | if (desc.flags & VRING_DESC_F_WRITE) { |
1061 | in_total += desc.len; | |
967f97fa | 1062 | } else { |
aa570d6f | 1063 | out_total += desc.len; |
967f97fa | 1064 | } |
e1f7b481 MT |
1065 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
1066 | goto done; | |
1067 | } | |
412e0e81 | 1068 | |
86044b24 | 1069 | rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, max, &i); |
412e0e81 SH |
1070 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
1071 | ||
1072 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { | |
1073 | goto err; | |
1074 | } | |
efeea6d0 | 1075 | |
5eba0404 PB |
1076 | if (desc_cache == &indirect_desc_cache) { |
1077 | address_space_cache_destroy(&indirect_desc_cache); | |
efeea6d0 | 1078 | total_bufs++; |
9796d0ac PB |
1079 | } else { |
1080 | total_bufs = num_bufs; | |
1081 | } | |
967f97fa | 1082 | } |
4355c1ab SH |
1083 | |
1084 | if (rc < 0) { | |
1085 | goto err; | |
1086 | } | |
1087 | ||
e1f7b481 | 1088 | done: |
5eba0404 | 1089 | address_space_cache_destroy(&indirect_desc_cache); |
0d8d7690 | 1090 | if (in_bytes) { |
86044b24 JW |
1091 | *in_bytes = in_total; |
1092 | } | |
1093 | if (out_bytes) { | |
1094 | *out_bytes = out_total; | |
1095 | } | |
86044b24 JW |
1096 | return; |
1097 | ||
1098 | err: | |
1099 | in_total = out_total = 0; | |
1100 | goto done; | |
1101 | } | |
1102 | ||
1103 | static int virtqueue_packed_read_next_desc(VirtQueue *vq, | |
1104 | VRingPackedDesc *desc, | |
1105 | MemoryRegionCache | |
1106 | *desc_cache, | |
1107 | unsigned int max, | |
1108 | unsigned int *next, | |
1109 | bool indirect) | |
1110 | { | |
1111 | /* If this descriptor says it doesn't chain, we're done. */ | |
1112 | if (!indirect && !(desc->flags & VRING_DESC_F_NEXT)) { | |
1113 | return VIRTQUEUE_READ_DESC_DONE; | |
1114 | } | |
1115 | ||
1116 | ++*next; | |
1117 | if (*next == max) { | |
1118 | if (indirect) { | |
1119 | return VIRTQUEUE_READ_DESC_DONE; | |
1120 | } else { | |
1121 | (*next) -= vq->vring.num; | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | vring_packed_desc_read(vq->vdev, desc, desc_cache, *next, false); | |
1126 | return VIRTQUEUE_READ_DESC_MORE; | |
1127 | } | |
1128 | ||
1129 | static void virtqueue_packed_get_avail_bytes(VirtQueue *vq, | |
1130 | unsigned int *in_bytes, | |
1131 | unsigned int *out_bytes, | |
1132 | unsigned max_in_bytes, | |
1133 | unsigned max_out_bytes) | |
1134 | { | |
1135 | VirtIODevice *vdev = vq->vdev; | |
1136 | unsigned int max, idx; | |
1137 | unsigned int total_bufs, in_total, out_total; | |
1138 | MemoryRegionCache *desc_cache; | |
1139 | VRingMemoryRegionCaches *caches; | |
1140 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; | |
1141 | int64_t len = 0; | |
1142 | VRingPackedDesc desc; | |
1143 | bool wrap_counter; | |
1144 | ||
b5f53d04 | 1145 | RCU_READ_LOCK_GUARD(); |
86044b24 JW |
1146 | idx = vq->last_avail_idx; |
1147 | wrap_counter = vq->last_avail_wrap_counter; | |
1148 | total_bufs = in_total = out_total = 0; | |
1149 | ||
1150 | max = vq->vring.num; | |
1151 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
1152 | if (!caches) { |
1153 | goto err; | |
1154 | } | |
86044b24 JW |
1155 | |
1156 | for (;;) { | |
1157 | unsigned int num_bufs = total_bufs; | |
1158 | unsigned int i = idx; | |
1159 | int rc; | |
1160 | ||
1161 | desc_cache = &caches->desc; | |
1162 | vring_packed_desc_read(vdev, &desc, desc_cache, idx, true); | |
1163 | if (!is_desc_avail(desc.flags, wrap_counter)) { | |
1164 | break; | |
1165 | } | |
1166 | ||
1167 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
1168 | if (desc.len % sizeof(VRingPackedDesc)) { | |
1169 | virtio_error(vdev, "Invalid size for indirect buffer table"); | |
1170 | goto err; | |
1171 | } | |
1172 | ||
1173 | /* If we've got too many, that implies a descriptor loop. */ | |
1174 | if (num_bufs >= max) { | |
1175 | virtio_error(vdev, "Looped descriptor"); | |
1176 | goto err; | |
1177 | } | |
1178 | ||
1179 | /* loop over the indirect descriptor table */ | |
1180 | len = address_space_cache_init(&indirect_desc_cache, | |
1181 | vdev->dma_as, | |
1182 | desc.addr, desc.len, false); | |
1183 | desc_cache = &indirect_desc_cache; | |
1184 | if (len < desc.len) { | |
1185 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1186 | goto err; | |
1187 | } | |
1188 | ||
1189 | max = desc.len / sizeof(VRingPackedDesc); | |
1190 | num_bufs = i = 0; | |
1191 | vring_packed_desc_read(vdev, &desc, desc_cache, i, false); | |
1192 | } | |
1193 | ||
1194 | do { | |
1195 | /* If we've got too many, that implies a descriptor loop. */ | |
1196 | if (++num_bufs > max) { | |
1197 | virtio_error(vdev, "Looped descriptor"); | |
1198 | goto err; | |
1199 | } | |
1200 | ||
1201 | if (desc.flags & VRING_DESC_F_WRITE) { | |
1202 | in_total += desc.len; | |
1203 | } else { | |
1204 | out_total += desc.len; | |
1205 | } | |
1206 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { | |
1207 | goto done; | |
1208 | } | |
1209 | ||
1210 | rc = virtqueue_packed_read_next_desc(vq, &desc, desc_cache, max, | |
1211 | &i, desc_cache == | |
1212 | &indirect_desc_cache); | |
1213 | } while (rc == VIRTQUEUE_READ_DESC_MORE); | |
1214 | ||
1215 | if (desc_cache == &indirect_desc_cache) { | |
1216 | address_space_cache_destroy(&indirect_desc_cache); | |
1217 | total_bufs++; | |
1218 | idx++; | |
1219 | } else { | |
1220 | idx += num_bufs - total_bufs; | |
1221 | total_bufs = num_bufs; | |
1222 | } | |
1223 | ||
1224 | if (idx >= vq->vring.num) { | |
1225 | idx -= vq->vring.num; | |
1226 | wrap_counter ^= 1; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | /* Record the index and wrap counter for a kick we want */ | |
1231 | vq->shadow_avail_idx = idx; | |
1232 | vq->shadow_avail_wrap_counter = wrap_counter; | |
1233 | done: | |
1234 | address_space_cache_destroy(&indirect_desc_cache); | |
1235 | if (in_bytes) { | |
1236 | *in_bytes = in_total; | |
1237 | } | |
1238 | if (out_bytes) { | |
1239 | *out_bytes = out_total; | |
1240 | } | |
86044b24 JW |
1241 | return; |
1242 | ||
1243 | err: | |
1244 | in_total = out_total = 0; | |
1245 | goto done; | |
1246 | } | |
1247 | ||
1248 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, | |
1249 | unsigned int *out_bytes, | |
1250 | unsigned max_in_bytes, unsigned max_out_bytes) | |
1251 | { | |
1252 | uint16_t desc_size; | |
1253 | VRingMemoryRegionCaches *caches; | |
1254 | ||
1255 | if (unlikely(!vq->vring.desc)) { | |
1256 | goto err; | |
1257 | } | |
1258 | ||
1259 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
1260 | if (!caches) { |
1261 | goto err; | |
1262 | } | |
1263 | ||
86044b24 JW |
1264 | desc_size = virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED) ? |
1265 | sizeof(VRingPackedDesc) : sizeof(VRingDesc); | |
1266 | if (caches->desc.len < vq->vring.num * desc_size) { | |
1267 | virtio_error(vq->vdev, "Cannot map descriptor ring"); | |
1268 | goto err; | |
1269 | } | |
1270 | ||
1271 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
1272 | virtqueue_packed_get_avail_bytes(vq, in_bytes, out_bytes, | |
1273 | max_in_bytes, max_out_bytes); | |
1274 | } else { | |
1275 | virtqueue_split_get_avail_bytes(vq, in_bytes, out_bytes, | |
1276 | max_in_bytes, max_out_bytes); | |
1277 | } | |
1278 | ||
1279 | return; | |
1280 | err: | |
1281 | if (in_bytes) { | |
1282 | *in_bytes = 0; | |
0d8d7690 AS |
1283 | } |
1284 | if (out_bytes) { | |
86044b24 | 1285 | *out_bytes = 0; |
0d8d7690 AS |
1286 | } |
1287 | } | |
967f97fa | 1288 | |
0d8d7690 AS |
1289 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
1290 | unsigned int out_bytes) | |
1291 | { | |
1292 | unsigned int in_total, out_total; | |
1293 | ||
e1f7b481 MT |
1294 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); |
1295 | return in_bytes <= in_total && out_bytes <= out_total; | |
967f97fa AL |
1296 | } |
1297 | ||
ec55da19 SH |
1298 | static bool virtqueue_map_desc(VirtIODevice *vdev, unsigned int *p_num_sg, |
1299 | hwaddr *addr, struct iovec *iov, | |
3b3b0628 PB |
1300 | unsigned int max_num_sg, bool is_write, |
1301 | hwaddr pa, size_t sz) | |
1302 | { | |
ec55da19 | 1303 | bool ok = false; |
3b3b0628 PB |
1304 | unsigned num_sg = *p_num_sg; |
1305 | assert(num_sg <= max_num_sg); | |
1306 | ||
1e7aed70 | 1307 | if (!sz) { |
ec55da19 SH |
1308 | virtio_error(vdev, "virtio: zero sized buffers are not allowed"); |
1309 | goto out; | |
1e7aed70 PP |
1310 | } |
1311 | ||
3b3b0628 PB |
1312 | while (sz) { |
1313 | hwaddr len = sz; | |
1314 | ||
1315 | if (num_sg == max_num_sg) { | |
ec55da19 SH |
1316 | virtio_error(vdev, "virtio: too many write descriptors in " |
1317 | "indirect table"); | |
1318 | goto out; | |
3b3b0628 PB |
1319 | } |
1320 | ||
8607f5c3 JW |
1321 | iov[num_sg].iov_base = dma_memory_map(vdev->dma_as, pa, &len, |
1322 | is_write ? | |
1323 | DMA_DIRECTION_FROM_DEVICE : | |
1324 | DMA_DIRECTION_TO_DEVICE); | |
973e7170 | 1325 | if (!iov[num_sg].iov_base) { |
ec55da19 SH |
1326 | virtio_error(vdev, "virtio: bogus descriptor or out of resources"); |
1327 | goto out; | |
973e7170 PP |
1328 | } |
1329 | ||
3b3b0628 PB |
1330 | iov[num_sg].iov_len = len; |
1331 | addr[num_sg] = pa; | |
1332 | ||
1333 | sz -= len; | |
1334 | pa += len; | |
1335 | num_sg++; | |
1336 | } | |
ec55da19 SH |
1337 | ok = true; |
1338 | ||
1339 | out: | |
3b3b0628 | 1340 | *p_num_sg = num_sg; |
ec55da19 SH |
1341 | return ok; |
1342 | } | |
1343 | ||
1344 | /* Only used by error code paths before we have a VirtQueueElement (therefore | |
1345 | * virtqueue_unmap_sg() can't be used). Assumes buffers weren't written to | |
1346 | * yet. | |
1347 | */ | |
1348 | static void virtqueue_undo_map_desc(unsigned int out_num, unsigned int in_num, | |
1349 | struct iovec *iov) | |
1350 | { | |
1351 | unsigned int i; | |
1352 | ||
1353 | for (i = 0; i < out_num + in_num; i++) { | |
1354 | int is_write = i >= out_num; | |
1355 | ||
1356 | cpu_physical_memory_unmap(iov->iov_base, iov->iov_len, is_write, 0); | |
1357 | iov++; | |
1358 | } | |
3b3b0628 PB |
1359 | } |
1360 | ||
8607f5c3 | 1361 | static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg, |
e4fbf5b2 | 1362 | hwaddr *addr, unsigned int num_sg, |
22953364 | 1363 | bool is_write) |
42fb2e07 KW |
1364 | { |
1365 | unsigned int i; | |
a8170e5e | 1366 | hwaddr len; |
42fb2e07 | 1367 | |
e4fbf5b2 | 1368 | for (i = 0; i < num_sg; i++) { |
42fb2e07 | 1369 | len = sg[i].iov_len; |
8607f5c3 JW |
1370 | sg[i].iov_base = dma_memory_map(vdev->dma_as, |
1371 | addr[i], &len, is_write ? | |
1372 | DMA_DIRECTION_FROM_DEVICE : | |
1373 | DMA_DIRECTION_TO_DEVICE); | |
8059feee | 1374 | if (!sg[i].iov_base) { |
1a285899 | 1375 | error_report("virtio: error trying to map MMIO memory"); |
42fb2e07 KW |
1376 | exit(1); |
1377 | } | |
3b3b0628 PB |
1378 | if (len != sg[i].iov_len) { |
1379 | error_report("virtio: unexpected memory split"); | |
8059feee MT |
1380 | exit(1); |
1381 | } | |
42fb2e07 KW |
1382 | } |
1383 | } | |
1384 | ||
8607f5c3 | 1385 | void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem) |
8059feee | 1386 | { |
22953364 PMD |
1387 | virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, elem->in_num, true); |
1388 | virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, elem->out_num, | |
1389 | false); | |
3724650d PB |
1390 | } |
1391 | ||
bf91bd27 | 1392 | static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num) |
3724650d PB |
1393 | { |
1394 | VirtQueueElement *elem; | |
1395 | size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0])); | |
1396 | size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]); | |
1397 | size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]); | |
1398 | size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0])); | |
1399 | size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); | |
1400 | size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); | |
1401 | ||
1402 | assert(sz >= sizeof(VirtQueueElement)); | |
1403 | elem = g_malloc(out_sg_end); | |
b0ac429f | 1404 | trace_virtqueue_alloc_element(elem, sz, in_num, out_num); |
3724650d PB |
1405 | elem->out_num = out_num; |
1406 | elem->in_num = in_num; | |
1407 | elem->in_addr = (void *)elem + in_addr_ofs; | |
1408 | elem->out_addr = (void *)elem + out_addr_ofs; | |
1409 | elem->in_sg = (void *)elem + in_sg_ofs; | |
1410 | elem->out_sg = (void *)elem + out_sg_ofs; | |
1411 | return elem; | |
8059feee MT |
1412 | } |
1413 | ||
86044b24 | 1414 | static void *virtqueue_split_pop(VirtQueue *vq, size_t sz) |
967f97fa | 1415 | { |
5774cf98 | 1416 | unsigned int i, head, max; |
991976f7 | 1417 | VRingMemoryRegionCaches *caches; |
5eba0404 PB |
1418 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
1419 | MemoryRegionCache *desc_cache; | |
1420 | int64_t len; | |
cee3ca00 | 1421 | VirtIODevice *vdev = vq->vdev; |
9796d0ac | 1422 | VirtQueueElement *elem = NULL; |
37ef70be | 1423 | unsigned out_num, in_num, elem_entries; |
3b3b0628 PB |
1424 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; |
1425 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
aa570d6f | 1426 | VRingDesc desc; |
412e0e81 | 1427 | int rc; |
967f97fa | 1428 | |
b5f53d04 | 1429 | RCU_READ_LOCK_GUARD(); |
97cd965c PB |
1430 | if (virtio_queue_empty_rcu(vq)) { |
1431 | goto done; | |
51b19ebe | 1432 | } |
be1fea9b VM |
1433 | /* Needed after virtio_queue_empty(), see comment in |
1434 | * virtqueue_num_heads(). */ | |
1435 | smp_rmb(); | |
967f97fa AL |
1436 | |
1437 | /* When we start there are none of either input nor output. */ | |
37ef70be | 1438 | out_num = in_num = elem_entries = 0; |
967f97fa | 1439 | |
5774cf98 MM |
1440 | max = vq->vring.num; |
1441 | ||
afd9096e | 1442 | if (vq->inuse >= vq->vring.num) { |
ec55da19 | 1443 | virtio_error(vdev, "Virtqueue size exceeded"); |
97cd965c | 1444 | goto done; |
afd9096e SH |
1445 | } |
1446 | ||
fb1131b6 | 1447 | if (!virtqueue_get_head(vq, vq->last_avail_idx++, &head)) { |
97cd965c | 1448 | goto done; |
fb1131b6 SH |
1449 | } |
1450 | ||
95129d6f | 1451 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 1452 | vring_set_avail_event(vq, vq->last_avail_idx); |
bcbabae8 | 1453 | } |
efeea6d0 | 1454 | |
fb1131b6 | 1455 | i = head; |
9796d0ac | 1456 | |
e0e2d644 | 1457 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
1458 | if (!caches) { |
1459 | virtio_error(vdev, "Region caches not initialized"); | |
1460 | goto done; | |
1461 | } | |
1462 | ||
991976f7 | 1463 | if (caches->desc.len < max * sizeof(VRingDesc)) { |
9796d0ac PB |
1464 | virtio_error(vdev, "Cannot map descriptor ring"); |
1465 | goto done; | |
1466 | } | |
1467 | ||
991976f7 | 1468 | desc_cache = &caches->desc; |
86044b24 | 1469 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
aa570d6f | 1470 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
74231929 | 1471 | if (!desc.len || (desc.len % sizeof(VRingDesc))) { |
ec55da19 | 1472 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
9796d0ac | 1473 | goto done; |
efeea6d0 MM |
1474 | } |
1475 | ||
1476 | /* loop over the indirect descriptor table */ | |
5eba0404 PB |
1477 | len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, |
1478 | desc.addr, desc.len, false); | |
1479 | desc_cache = &indirect_desc_cache; | |
9796d0ac PB |
1480 | if (len < desc.len) { |
1481 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1482 | goto done; | |
1483 | } | |
1484 | ||
aa570d6f | 1485 | max = desc.len / sizeof(VRingDesc); |
efeea6d0 | 1486 | i = 0; |
86044b24 | 1487 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 MM |
1488 | } |
1489 | ||
42fb2e07 | 1490 | /* Collect all the descriptors */ |
967f97fa | 1491 | do { |
ec55da19 SH |
1492 | bool map_ok; |
1493 | ||
aa570d6f | 1494 | if (desc.flags & VRING_DESC_F_WRITE) { |
ec55da19 SH |
1495 | map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num, |
1496 | iov + out_num, | |
1497 | VIRTQUEUE_MAX_SIZE - out_num, true, | |
1498 | desc.addr, desc.len); | |
42fb2e07 | 1499 | } else { |
3b3b0628 | 1500 | if (in_num) { |
ec55da19 SH |
1501 | virtio_error(vdev, "Incorrect order for descriptors"); |
1502 | goto err_undo_map; | |
c8eac1cf | 1503 | } |
ec55da19 SH |
1504 | map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov, |
1505 | VIRTQUEUE_MAX_SIZE, false, | |
1506 | desc.addr, desc.len); | |
1507 | } | |
1508 | if (!map_ok) { | |
1509 | goto err_undo_map; | |
42fb2e07 | 1510 | } |
967f97fa | 1511 | |
967f97fa | 1512 | /* If we've got too many, that implies a descriptor loop. */ |
37ef70be | 1513 | if (++elem_entries > max) { |
ec55da19 SH |
1514 | virtio_error(vdev, "Looped descriptor"); |
1515 | goto err_undo_map; | |
bb6834cf | 1516 | } |
412e0e81 | 1517 | |
86044b24 | 1518 | rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, max, &i); |
412e0e81 SH |
1519 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
1520 | ||
1521 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { | |
1522 | goto err_undo_map; | |
1523 | } | |
967f97fa | 1524 | |
3b3b0628 PB |
1525 | /* Now copy what we have collected and mapped */ |
1526 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
967f97fa | 1527 | elem->index = head; |
86044b24 | 1528 | elem->ndescs = 1; |
3b3b0628 PB |
1529 | for (i = 0; i < out_num; i++) { |
1530 | elem->out_addr[i] = addr[i]; | |
1531 | elem->out_sg[i] = iov[i]; | |
1532 | } | |
1533 | for (i = 0; i < in_num; i++) { | |
1534 | elem->in_addr[i] = addr[out_num + i]; | |
1535 | elem->in_sg[i] = iov[out_num + i]; | |
1536 | } | |
967f97fa AL |
1537 | |
1538 | vq->inuse++; | |
1539 | ||
64979a4d | 1540 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
9796d0ac | 1541 | done: |
5eba0404 | 1542 | address_space_cache_destroy(&indirect_desc_cache); |
9796d0ac | 1543 | |
51b19ebe | 1544 | return elem; |
ec55da19 SH |
1545 | |
1546 | err_undo_map: | |
1547 | virtqueue_undo_map_desc(out_num, in_num, iov); | |
9796d0ac | 1548 | goto done; |
967f97fa AL |
1549 | } |
1550 | ||
86044b24 JW |
1551 | static void *virtqueue_packed_pop(VirtQueue *vq, size_t sz) |
1552 | { | |
1553 | unsigned int i, max; | |
1554 | VRingMemoryRegionCaches *caches; | |
1555 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; | |
1556 | MemoryRegionCache *desc_cache; | |
1557 | int64_t len; | |
1558 | VirtIODevice *vdev = vq->vdev; | |
1559 | VirtQueueElement *elem = NULL; | |
1560 | unsigned out_num, in_num, elem_entries; | |
1561 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; | |
1562 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
1563 | VRingPackedDesc desc; | |
1564 | uint16_t id; | |
1565 | int rc; | |
1566 | ||
b5f53d04 | 1567 | RCU_READ_LOCK_GUARD(); |
86044b24 JW |
1568 | if (virtio_queue_packed_empty_rcu(vq)) { |
1569 | goto done; | |
1570 | } | |
1571 | ||
1572 | /* When we start there are none of either input nor output. */ | |
1573 | out_num = in_num = elem_entries = 0; | |
1574 | ||
1575 | max = vq->vring.num; | |
1576 | ||
1577 | if (vq->inuse >= vq->vring.num) { | |
1578 | virtio_error(vdev, "Virtqueue size exceeded"); | |
1579 | goto done; | |
1580 | } | |
1581 | ||
1582 | i = vq->last_avail_idx; | |
1583 | ||
1584 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
1585 | if (!caches) { |
1586 | virtio_error(vdev, "Region caches not initialized"); | |
1587 | goto done; | |
1588 | } | |
1589 | ||
86044b24 JW |
1590 | if (caches->desc.len < max * sizeof(VRingDesc)) { |
1591 | virtio_error(vdev, "Cannot map descriptor ring"); | |
1592 | goto done; | |
1593 | } | |
1594 | ||
1595 | desc_cache = &caches->desc; | |
1596 | vring_packed_desc_read(vdev, &desc, desc_cache, i, true); | |
1597 | id = desc.id; | |
1598 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
1599 | if (desc.len % sizeof(VRingPackedDesc)) { | |
1600 | virtio_error(vdev, "Invalid size for indirect buffer table"); | |
1601 | goto done; | |
1602 | } | |
1603 | ||
1604 | /* loop over the indirect descriptor table */ | |
1605 | len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, | |
1606 | desc.addr, desc.len, false); | |
1607 | desc_cache = &indirect_desc_cache; | |
1608 | if (len < desc.len) { | |
1609 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1610 | goto done; | |
1611 | } | |
1612 | ||
1613 | max = desc.len / sizeof(VRingPackedDesc); | |
1614 | i = 0; | |
1615 | vring_packed_desc_read(vdev, &desc, desc_cache, i, false); | |
1616 | } | |
1617 | ||
1618 | /* Collect all the descriptors */ | |
1619 | do { | |
1620 | bool map_ok; | |
1621 | ||
1622 | if (desc.flags & VRING_DESC_F_WRITE) { | |
1623 | map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num, | |
1624 | iov + out_num, | |
1625 | VIRTQUEUE_MAX_SIZE - out_num, true, | |
1626 | desc.addr, desc.len); | |
1627 | } else { | |
1628 | if (in_num) { | |
1629 | virtio_error(vdev, "Incorrect order for descriptors"); | |
1630 | goto err_undo_map; | |
1631 | } | |
1632 | map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov, | |
1633 | VIRTQUEUE_MAX_SIZE, false, | |
1634 | desc.addr, desc.len); | |
1635 | } | |
1636 | if (!map_ok) { | |
1637 | goto err_undo_map; | |
1638 | } | |
1639 | ||
1640 | /* If we've got too many, that implies a descriptor loop. */ | |
1641 | if (++elem_entries > max) { | |
1642 | virtio_error(vdev, "Looped descriptor"); | |
1643 | goto err_undo_map; | |
1644 | } | |
1645 | ||
1646 | rc = virtqueue_packed_read_next_desc(vq, &desc, desc_cache, max, &i, | |
1647 | desc_cache == | |
1648 | &indirect_desc_cache); | |
1649 | } while (rc == VIRTQUEUE_READ_DESC_MORE); | |
1650 | ||
1651 | /* Now copy what we have collected and mapped */ | |
1652 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
1653 | for (i = 0; i < out_num; i++) { | |
1654 | elem->out_addr[i] = addr[i]; | |
1655 | elem->out_sg[i] = iov[i]; | |
1656 | } | |
1657 | for (i = 0; i < in_num; i++) { | |
1658 | elem->in_addr[i] = addr[out_num + i]; | |
1659 | elem->in_sg[i] = iov[out_num + i]; | |
1660 | } | |
1661 | ||
1662 | elem->index = id; | |
1663 | elem->ndescs = (desc_cache == &indirect_desc_cache) ? 1 : elem_entries; | |
1664 | vq->last_avail_idx += elem->ndescs; | |
1665 | vq->inuse += elem->ndescs; | |
1666 | ||
1667 | if (vq->last_avail_idx >= vq->vring.num) { | |
1668 | vq->last_avail_idx -= vq->vring.num; | |
1669 | vq->last_avail_wrap_counter ^= 1; | |
1670 | } | |
1671 | ||
1672 | vq->shadow_avail_idx = vq->last_avail_idx; | |
1673 | vq->shadow_avail_wrap_counter = vq->last_avail_wrap_counter; | |
1674 | ||
1675 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); | |
1676 | done: | |
1677 | address_space_cache_destroy(&indirect_desc_cache); | |
86044b24 JW |
1678 | |
1679 | return elem; | |
1680 | ||
1681 | err_undo_map: | |
1682 | virtqueue_undo_map_desc(out_num, in_num, iov); | |
1683 | goto done; | |
1684 | } | |
1685 | ||
1686 | void *virtqueue_pop(VirtQueue *vq, size_t sz) | |
1687 | { | |
9d7bd082 | 1688 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
1689 | return NULL; |
1690 | } | |
1691 | ||
1692 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
1693 | return virtqueue_packed_pop(vq, sz); | |
1694 | } else { | |
1695 | return virtqueue_split_pop(vq, sz); | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | static unsigned int virtqueue_packed_drop_all(VirtQueue *vq) | |
54e17709 | 1700 | { |
86044b24 JW |
1701 | VRingMemoryRegionCaches *caches; |
1702 | MemoryRegionCache *desc_cache; | |
54e17709 YB |
1703 | unsigned int dropped = 0; |
1704 | VirtQueueElement elem = {}; | |
1705 | VirtIODevice *vdev = vq->vdev; | |
86044b24 | 1706 | VRingPackedDesc desc; |
54e17709 | 1707 | |
86044b24 | 1708 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
1709 | if (!caches) { |
1710 | return 0; | |
1711 | } | |
1712 | ||
86044b24 JW |
1713 | desc_cache = &caches->desc; |
1714 | ||
1715 | virtio_queue_set_notification(vq, 0); | |
1716 | ||
1717 | while (vq->inuse < vq->vring.num) { | |
1718 | unsigned int idx = vq->last_avail_idx; | |
1719 | /* | |
1720 | * works similar to virtqueue_pop but does not map buffers | |
1721 | * and does not allocate any memory. | |
1722 | */ | |
1723 | vring_packed_desc_read(vdev, &desc, desc_cache, | |
1724 | vq->last_avail_idx , true); | |
1725 | if (!is_desc_avail(desc.flags, vq->last_avail_wrap_counter)) { | |
1726 | break; | |
1727 | } | |
1728 | elem.index = desc.id; | |
1729 | elem.ndescs = 1; | |
1730 | while (virtqueue_packed_read_next_desc(vq, &desc, desc_cache, | |
1731 | vq->vring.num, &idx, false)) { | |
1732 | ++elem.ndescs; | |
1733 | } | |
1734 | /* | |
1735 | * immediately push the element, nothing to unmap | |
1736 | * as both in_num and out_num are set to 0. | |
1737 | */ | |
1738 | virtqueue_push(vq, &elem, 0); | |
1739 | dropped++; | |
1740 | vq->last_avail_idx += elem.ndescs; | |
1741 | if (vq->last_avail_idx >= vq->vring.num) { | |
1742 | vq->last_avail_idx -= vq->vring.num; | |
1743 | vq->last_avail_wrap_counter ^= 1; | |
1744 | } | |
54e17709 YB |
1745 | } |
1746 | ||
86044b24 JW |
1747 | return dropped; |
1748 | } | |
1749 | ||
1750 | static unsigned int virtqueue_split_drop_all(VirtQueue *vq) | |
1751 | { | |
1752 | unsigned int dropped = 0; | |
1753 | VirtQueueElement elem = {}; | |
1754 | VirtIODevice *vdev = vq->vdev; | |
1755 | bool fEventIdx = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX); | |
1756 | ||
54e17709 YB |
1757 | while (!virtio_queue_empty(vq) && vq->inuse < vq->vring.num) { |
1758 | /* works similar to virtqueue_pop but does not map buffers | |
1759 | * and does not allocate any memory */ | |
1760 | smp_rmb(); | |
1761 | if (!virtqueue_get_head(vq, vq->last_avail_idx, &elem.index)) { | |
1762 | break; | |
1763 | } | |
1764 | vq->inuse++; | |
1765 | vq->last_avail_idx++; | |
1766 | if (fEventIdx) { | |
1767 | vring_set_avail_event(vq, vq->last_avail_idx); | |
1768 | } | |
1769 | /* immediately push the element, nothing to unmap | |
1770 | * as both in_num and out_num are set to 0 */ | |
1771 | virtqueue_push(vq, &elem, 0); | |
1772 | dropped++; | |
1773 | } | |
1774 | ||
1775 | return dropped; | |
1776 | } | |
1777 | ||
86044b24 JW |
1778 | /* virtqueue_drop_all: |
1779 | * @vq: The #VirtQueue | |
1780 | * Drops all queued buffers and indicates them to the guest | |
1781 | * as if they are done. Useful when buffers can not be | |
1782 | * processed but must be returned to the guest. | |
1783 | */ | |
1784 | unsigned int virtqueue_drop_all(VirtQueue *vq) | |
1785 | { | |
1786 | struct VirtIODevice *vdev = vq->vdev; | |
1787 | ||
9d7bd082 | 1788 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
1789 | return 0; |
1790 | } | |
1791 | ||
1792 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
1793 | return virtqueue_packed_drop_all(vq); | |
1794 | } else { | |
1795 | return virtqueue_split_drop_all(vq); | |
1796 | } | |
1797 | } | |
1798 | ||
3724650d PB |
1799 | /* Reading and writing a structure directly to QEMUFile is *awful*, but |
1800 | * it is what QEMU has always done by mistake. We can change it sooner | |
1801 | * or later by bumping the version number of the affected vm states. | |
1802 | * In the meanwhile, since the in-memory layout of VirtQueueElement | |
1803 | * has changed, we need to marshal to and from the layout that was | |
1804 | * used before the change. | |
1805 | */ | |
1806 | typedef struct VirtQueueElementOld { | |
1807 | unsigned int index; | |
1808 | unsigned int out_num; | |
1809 | unsigned int in_num; | |
1810 | hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; | |
1811 | hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; | |
1812 | struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; | |
1813 | struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; | |
1814 | } VirtQueueElementOld; | |
1815 | ||
8607f5c3 | 1816 | void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz) |
ab281c17 | 1817 | { |
3724650d PB |
1818 | VirtQueueElement *elem; |
1819 | VirtQueueElementOld data; | |
1820 | int i; | |
1821 | ||
1822 | qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
1823 | ||
6bdc21c0 MT |
1824 | /* TODO: teach all callers that this can fail, and return failure instead |
1825 | * of asserting here. | |
262a69f4 EB |
1826 | * This is just one thing (there are probably more) that must be |
1827 | * fixed before we can allow NDEBUG compilation. | |
6bdc21c0 | 1828 | */ |
6bdc21c0 MT |
1829 | assert(ARRAY_SIZE(data.in_addr) >= data.in_num); |
1830 | assert(ARRAY_SIZE(data.out_addr) >= data.out_num); | |
1831 | ||
3724650d PB |
1832 | elem = virtqueue_alloc_element(sz, data.out_num, data.in_num); |
1833 | elem->index = data.index; | |
1834 | ||
1835 | for (i = 0; i < elem->in_num; i++) { | |
1836 | elem->in_addr[i] = data.in_addr[i]; | |
1837 | } | |
1838 | ||
1839 | for (i = 0; i < elem->out_num; i++) { | |
1840 | elem->out_addr[i] = data.out_addr[i]; | |
1841 | } | |
1842 | ||
1843 | for (i = 0; i < elem->in_num; i++) { | |
1844 | /* Base is overwritten by virtqueue_map. */ | |
1845 | elem->in_sg[i].iov_base = 0; | |
1846 | elem->in_sg[i].iov_len = data.in_sg[i].iov_len; | |
1847 | } | |
1848 | ||
1849 | for (i = 0; i < elem->out_num; i++) { | |
1850 | /* Base is overwritten by virtqueue_map. */ | |
1851 | elem->out_sg[i].iov_base = 0; | |
1852 | elem->out_sg[i].iov_len = data.out_sg[i].iov_len; | |
1853 | } | |
1854 | ||
86044b24 JW |
1855 | if (virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
1856 | qemu_get_be32s(f, &elem->ndescs); | |
1857 | } | |
1858 | ||
8607f5c3 | 1859 | virtqueue_map(vdev, elem); |
ab281c17 PB |
1860 | return elem; |
1861 | } | |
1862 | ||
86044b24 JW |
1863 | void qemu_put_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, |
1864 | VirtQueueElement *elem) | |
ab281c17 | 1865 | { |
3724650d PB |
1866 | VirtQueueElementOld data; |
1867 | int i; | |
1868 | ||
1869 | memset(&data, 0, sizeof(data)); | |
1870 | data.index = elem->index; | |
1871 | data.in_num = elem->in_num; | |
1872 | data.out_num = elem->out_num; | |
1873 | ||
1874 | for (i = 0; i < elem->in_num; i++) { | |
1875 | data.in_addr[i] = elem->in_addr[i]; | |
1876 | } | |
1877 | ||
1878 | for (i = 0; i < elem->out_num; i++) { | |
1879 | data.out_addr[i] = elem->out_addr[i]; | |
1880 | } | |
1881 | ||
1882 | for (i = 0; i < elem->in_num; i++) { | |
1883 | /* Base is overwritten by virtqueue_map when loading. Do not | |
1884 | * save it, as it would leak the QEMU address space layout. */ | |
1885 | data.in_sg[i].iov_len = elem->in_sg[i].iov_len; | |
1886 | } | |
1887 | ||
1888 | for (i = 0; i < elem->out_num; i++) { | |
1889 | /* Do not save iov_base as above. */ | |
1890 | data.out_sg[i].iov_len = elem->out_sg[i].iov_len; | |
1891 | } | |
86044b24 JW |
1892 | |
1893 | if (virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
1894 | qemu_put_be32s(f, &elem->ndescs); | |
1895 | } | |
1896 | ||
3724650d | 1897 | qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); |
ab281c17 PB |
1898 | } |
1899 | ||
967f97fa | 1900 | /* virtio device */ |
7055e687 MT |
1901 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
1902 | { | |
1c819449 FK |
1903 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1904 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1905 | ||
9d7bd082 | 1906 | if (virtio_device_disabled(vdev)) { |
f5ed3663 SH |
1907 | return; |
1908 | } | |
1909 | ||
1c819449 FK |
1910 | if (k->notify) { |
1911 | k->notify(qbus->parent, vector); | |
7055e687 MT |
1912 | } |
1913 | } | |
967f97fa | 1914 | |
53c25cea | 1915 | void virtio_update_irq(VirtIODevice *vdev) |
967f97fa | 1916 | { |
7055e687 | 1917 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
967f97fa AL |
1918 | } |
1919 | ||
0b352fd6 CH |
1920 | static int virtio_validate_features(VirtIODevice *vdev) |
1921 | { | |
1922 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
1923 | ||
8607f5c3 JW |
1924 | if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM) && |
1925 | !virtio_vdev_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) { | |
1926 | return -EFAULT; | |
1927 | } | |
1928 | ||
0b352fd6 CH |
1929 | if (k->validate_features) { |
1930 | return k->validate_features(vdev); | |
1931 | } else { | |
1932 | return 0; | |
1933 | } | |
1934 | } | |
1935 | ||
1936 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) | |
4e1837f8 | 1937 | { |
181103cd | 1938 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
4e1837f8 SH |
1939 | trace_virtio_set_status(vdev, val); |
1940 | ||
95129d6f | 1941 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
0b352fd6 CH |
1942 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && |
1943 | val & VIRTIO_CONFIG_S_FEATURES_OK) { | |
1944 | int ret = virtio_validate_features(vdev); | |
1945 | ||
1946 | if (ret) { | |
1947 | return ret; | |
1948 | } | |
1949 | } | |
1950 | } | |
e57f2c31 | 1951 | |
4c5cf37b XY |
1952 | if ((vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) != |
1953 | (val & VIRTIO_CONFIG_S_DRIVER_OK)) { | |
1954 | virtio_set_started(vdev, val & VIRTIO_CONFIG_S_DRIVER_OK); | |
1955 | } | |
badaf79c | 1956 | |
181103cd FK |
1957 | if (k->set_status) { |
1958 | k->set_status(vdev, val); | |
4e1837f8 SH |
1959 | } |
1960 | vdev->status = val; | |
badaf79c | 1961 | |
0b352fd6 | 1962 | return 0; |
4e1837f8 SH |
1963 | } |
1964 | ||
616a6552 GK |
1965 | static enum virtio_device_endian virtio_default_endian(void) |
1966 | { | |
1967 | if (target_words_bigendian()) { | |
1968 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
1969 | } else { | |
1970 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
1971 | } | |
1972 | } | |
1973 | ||
1974 | static enum virtio_device_endian virtio_current_cpu_endian(void) | |
1975 | { | |
1976 | CPUClass *cc = CPU_GET_CLASS(current_cpu); | |
1977 | ||
1978 | if (cc->virtio_is_big_endian(current_cpu)) { | |
1979 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
1980 | } else { | |
1981 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
1982 | } | |
1983 | } | |
1984 | ||
53c25cea | 1985 | void virtio_reset(void *opaque) |
967f97fa AL |
1986 | { |
1987 | VirtIODevice *vdev = opaque; | |
181103cd | 1988 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
1989 | int i; |
1990 | ||
e0c472d8 | 1991 | virtio_set_status(vdev, 0); |
616a6552 GK |
1992 | if (current_cpu) { |
1993 | /* Guest initiated reset */ | |
1994 | vdev->device_endian = virtio_current_cpu_endian(); | |
1995 | } else { | |
1996 | /* System reset */ | |
1997 | vdev->device_endian = virtio_default_endian(); | |
1998 | } | |
e0c472d8 | 1999 | |
181103cd FK |
2000 | if (k->reset) { |
2001 | k->reset(vdev); | |
2002 | } | |
967f97fa | 2003 | |
868a8f44 | 2004 | vdev->start_on_kick = false; |
badaf79c | 2005 | vdev->started = false; |
f5ed3663 | 2006 | vdev->broken = false; |
704a76fc | 2007 | vdev->guest_features = 0; |
967f97fa AL |
2008 | vdev->queue_sel = 0; |
2009 | vdev->status = 0; | |
9d7bd082 | 2010 | vdev->disabled = false; |
d73415a3 | 2011 | qatomic_set(&vdev->isr, 0); |
7055e687 MT |
2012 | vdev->config_vector = VIRTIO_NO_VECTOR; |
2013 | virtio_notify_vector(vdev, vdev->config_vector); | |
967f97fa | 2014 | |
87b3bd1c | 2015 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2016 | vdev->vq[i].vring.desc = 0; |
2017 | vdev->vq[i].vring.avail = 0; | |
2018 | vdev->vq[i].vring.used = 0; | |
2019 | vdev->vq[i].last_avail_idx = 0; | |
be1fea9b | 2020 | vdev->vq[i].shadow_avail_idx = 0; |
b796fcd1 | 2021 | vdev->vq[i].used_idx = 0; |
86044b24 JW |
2022 | vdev->vq[i].last_avail_wrap_counter = true; |
2023 | vdev->vq[i].shadow_avail_wrap_counter = true; | |
2024 | vdev->vq[i].used_wrap_counter = true; | |
e0d686bf | 2025 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); |
bcbabae8 MT |
2026 | vdev->vq[i].signalled_used = 0; |
2027 | vdev->vq[i].signalled_used_valid = false; | |
332fa82d | 2028 | vdev->vq[i].notification = true; |
46c5d082 | 2029 | vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; |
4b7f91ed | 2030 | vdev->vq[i].inuse = 0; |
e0e2d644 | 2031 | virtio_virtqueue_reset_region_cache(&vdev->vq[i]); |
967f97fa AL |
2032 | } |
2033 | } | |
2034 | ||
53c25cea | 2035 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2036 | { |
181103cd | 2037 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2038 | uint8_t val; |
2039 | ||
5f5a1318 | 2040 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2041 | return (uint32_t)-1; |
5f5a1318 JW |
2042 | } |
2043 | ||
2044 | k->get_config(vdev, vdev->config); | |
967f97fa | 2045 | |
06dbfc6f | 2046 | val = ldub_p(vdev->config + addr); |
967f97fa AL |
2047 | return val; |
2048 | } | |
2049 | ||
53c25cea | 2050 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2051 | { |
181103cd | 2052 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2053 | uint16_t val; |
2054 | ||
5f5a1318 | 2055 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2056 | return (uint32_t)-1; |
5f5a1318 JW |
2057 | } |
2058 | ||
2059 | k->get_config(vdev, vdev->config); | |
967f97fa | 2060 | |
06dbfc6f | 2061 | val = lduw_p(vdev->config + addr); |
967f97fa AL |
2062 | return val; |
2063 | } | |
2064 | ||
53c25cea | 2065 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2066 | { |
181103cd | 2067 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2068 | uint32_t val; |
2069 | ||
5f5a1318 | 2070 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2071 | return (uint32_t)-1; |
5f5a1318 JW |
2072 | } |
2073 | ||
2074 | k->get_config(vdev, vdev->config); | |
967f97fa | 2075 | |
06dbfc6f | 2076 | val = ldl_p(vdev->config + addr); |
967f97fa AL |
2077 | return val; |
2078 | } | |
2079 | ||
53c25cea | 2080 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2081 | { |
181103cd | 2082 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2083 | uint8_t val = data; |
2084 | ||
5f5a1318 | 2085 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2086 | return; |
5f5a1318 | 2087 | } |
967f97fa | 2088 | |
06dbfc6f | 2089 | stb_p(vdev->config + addr, val); |
967f97fa | 2090 | |
181103cd FK |
2091 | if (k->set_config) { |
2092 | k->set_config(vdev, vdev->config); | |
2093 | } | |
967f97fa AL |
2094 | } |
2095 | ||
53c25cea | 2096 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2097 | { |
181103cd | 2098 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2099 | uint16_t val = data; |
2100 | ||
5f5a1318 | 2101 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2102 | return; |
5f5a1318 | 2103 | } |
967f97fa | 2104 | |
06dbfc6f | 2105 | stw_p(vdev->config + addr, val); |
967f97fa | 2106 | |
181103cd FK |
2107 | if (k->set_config) { |
2108 | k->set_config(vdev, vdev->config); | |
2109 | } | |
967f97fa AL |
2110 | } |
2111 | ||
53c25cea | 2112 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2113 | { |
181103cd | 2114 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2115 | uint32_t val = data; |
2116 | ||
5f5a1318 | 2117 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2118 | return; |
5f5a1318 | 2119 | } |
967f97fa | 2120 | |
06dbfc6f | 2121 | stl_p(vdev->config + addr, val); |
967f97fa | 2122 | |
181103cd FK |
2123 | if (k->set_config) { |
2124 | k->set_config(vdev, vdev->config); | |
2125 | } | |
967f97fa AL |
2126 | } |
2127 | ||
adfb743c MT |
2128 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr) |
2129 | { | |
2130 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2131 | uint8_t val; | |
2132 | ||
2133 | if (addr + sizeof(val) > vdev->config_len) { | |
2134 | return (uint32_t)-1; | |
2135 | } | |
2136 | ||
2137 | k->get_config(vdev, vdev->config); | |
2138 | ||
2139 | val = ldub_p(vdev->config + addr); | |
2140 | return val; | |
2141 | } | |
2142 | ||
2143 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr) | |
2144 | { | |
2145 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2146 | uint16_t val; | |
2147 | ||
2148 | if (addr + sizeof(val) > vdev->config_len) { | |
2149 | return (uint32_t)-1; | |
2150 | } | |
2151 | ||
2152 | k->get_config(vdev, vdev->config); | |
2153 | ||
2154 | val = lduw_le_p(vdev->config + addr); | |
2155 | return val; | |
2156 | } | |
2157 | ||
2158 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr) | |
2159 | { | |
2160 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2161 | uint32_t val; | |
2162 | ||
2163 | if (addr + sizeof(val) > vdev->config_len) { | |
2164 | return (uint32_t)-1; | |
2165 | } | |
2166 | ||
2167 | k->get_config(vdev, vdev->config); | |
2168 | ||
2169 | val = ldl_le_p(vdev->config + addr); | |
2170 | return val; | |
2171 | } | |
2172 | ||
2173 | void virtio_config_modern_writeb(VirtIODevice *vdev, | |
2174 | uint32_t addr, uint32_t data) | |
2175 | { | |
2176 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2177 | uint8_t val = data; | |
2178 | ||
2179 | if (addr + sizeof(val) > vdev->config_len) { | |
2180 | return; | |
2181 | } | |
2182 | ||
2183 | stb_p(vdev->config + addr, val); | |
2184 | ||
2185 | if (k->set_config) { | |
2186 | k->set_config(vdev, vdev->config); | |
2187 | } | |
2188 | } | |
2189 | ||
2190 | void virtio_config_modern_writew(VirtIODevice *vdev, | |
2191 | uint32_t addr, uint32_t data) | |
2192 | { | |
2193 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2194 | uint16_t val = data; | |
2195 | ||
2196 | if (addr + sizeof(val) > vdev->config_len) { | |
2197 | return; | |
2198 | } | |
2199 | ||
2200 | stw_le_p(vdev->config + addr, val); | |
2201 | ||
2202 | if (k->set_config) { | |
2203 | k->set_config(vdev, vdev->config); | |
2204 | } | |
2205 | } | |
2206 | ||
2207 | void virtio_config_modern_writel(VirtIODevice *vdev, | |
2208 | uint32_t addr, uint32_t data) | |
2209 | { | |
2210 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2211 | uint32_t val = data; | |
2212 | ||
2213 | if (addr + sizeof(val) > vdev->config_len) { | |
2214 | return; | |
2215 | } | |
2216 | ||
2217 | stl_le_p(vdev->config + addr, val); | |
2218 | ||
2219 | if (k->set_config) { | |
2220 | k->set_config(vdev, vdev->config); | |
2221 | } | |
2222 | } | |
2223 | ||
a8170e5e | 2224 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) |
967f97fa | 2225 | { |
758ead31 PP |
2226 | if (!vdev->vq[n].vring.num) { |
2227 | return; | |
2228 | } | |
ab223c95 CH |
2229 | vdev->vq[n].vring.desc = addr; |
2230 | virtio_queue_update_rings(vdev, n); | |
53c25cea PB |
2231 | } |
2232 | ||
a8170e5e | 2233 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) |
53c25cea | 2234 | { |
ab223c95 CH |
2235 | return vdev->vq[n].vring.desc; |
2236 | } | |
2237 | ||
2238 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, | |
2239 | hwaddr avail, hwaddr used) | |
2240 | { | |
758ead31 PP |
2241 | if (!vdev->vq[n].vring.num) { |
2242 | return; | |
2243 | } | |
ab223c95 CH |
2244 | vdev->vq[n].vring.desc = desc; |
2245 | vdev->vq[n].vring.avail = avail; | |
2246 | vdev->vq[n].vring.used = used; | |
c611c764 | 2247 | virtio_init_region_cache(vdev, n); |
53c25cea PB |
2248 | } |
2249 | ||
e63c0ba1 PM |
2250 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) |
2251 | { | |
f6049f44 PM |
2252 | /* Don't allow guest to flip queue between existent and |
2253 | * nonexistent states, or to set it to an invalid size. | |
2254 | */ | |
2255 | if (!!num != !!vdev->vq[n].vring.num || | |
2256 | num > VIRTQUEUE_MAX_SIZE || | |
2257 | num < 0) { | |
2258 | return; | |
e63c0ba1 | 2259 | } |
f6049f44 | 2260 | vdev->vq[n].vring.num = num; |
e63c0ba1 PM |
2261 | } |
2262 | ||
e0d686bf JW |
2263 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) |
2264 | { | |
2265 | return QLIST_FIRST(&vdev->vector_queues[vector]); | |
2266 | } | |
2267 | ||
2268 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) | |
2269 | { | |
2270 | return QLIST_NEXT(vq, node); | |
2271 | } | |
2272 | ||
53c25cea PB |
2273 | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
2274 | { | |
2275 | return vdev->vq[n].vring.num; | |
2276 | } | |
967f97fa | 2277 | |
8c797e75 MT |
2278 | int virtio_queue_get_max_num(VirtIODevice *vdev, int n) |
2279 | { | |
2280 | return vdev->vq[n].vring.num_default; | |
2281 | } | |
2282 | ||
8ad176aa JW |
2283 | int virtio_get_num_queues(VirtIODevice *vdev) |
2284 | { | |
2285 | int i; | |
2286 | ||
87b3bd1c | 2287 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
8ad176aa JW |
2288 | if (!virtio_queue_get_num(vdev, i)) { |
2289 | break; | |
2290 | } | |
2291 | } | |
2292 | ||
2293 | return i; | |
2294 | } | |
2295 | ||
6ce69d1c PM |
2296 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) |
2297 | { | |
2298 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2299 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2300 | ||
ab223c95 | 2301 | /* virtio-1 compliant devices cannot change the alignment */ |
95129d6f | 2302 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
ab223c95 CH |
2303 | error_report("tried to modify queue alignment for virtio-1 device"); |
2304 | return; | |
2305 | } | |
6ce69d1c PM |
2306 | /* Check that the transport told us it was going to do this |
2307 | * (so a buggy transport will immediately assert rather than | |
2308 | * silently failing to migrate this state) | |
2309 | */ | |
2310 | assert(k->has_variable_vring_alignment); | |
2311 | ||
758ead31 PP |
2312 | if (align) { |
2313 | vdev->vq[n].vring.align = align; | |
2314 | virtio_queue_update_rings(vdev, n); | |
2315 | } | |
6ce69d1c PM |
2316 | } |
2317 | ||
07931698 | 2318 | static bool virtio_queue_notify_aio_vq(VirtQueue *vq) |
344dc16f | 2319 | { |
badaf79c XY |
2320 | bool ret = false; |
2321 | ||
344dc16f MT |
2322 | if (vq->vring.desc && vq->handle_aio_output) { |
2323 | VirtIODevice *vdev = vq->vdev; | |
2324 | ||
2325 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
badaf79c XY |
2326 | ret = vq->handle_aio_output(vdev, vq); |
2327 | ||
2328 | if (unlikely(vdev->start_on_kick)) { | |
e57f2c31 | 2329 | virtio_set_started(vdev, true); |
badaf79c | 2330 | } |
344dc16f | 2331 | } |
07931698 | 2332 | |
badaf79c | 2333 | return ret; |
344dc16f MT |
2334 | } |
2335 | ||
2b2cbcad | 2336 | static void virtio_queue_notify_vq(VirtQueue *vq) |
25db9ebe | 2337 | { |
9e0f5b81 | 2338 | if (vq->vring.desc && vq->handle_output) { |
25db9ebe | 2339 | VirtIODevice *vdev = vq->vdev; |
9e0f5b81 | 2340 | |
f5ed3663 SH |
2341 | if (unlikely(vdev->broken)) { |
2342 | return; | |
2343 | } | |
2344 | ||
25db9ebe SH |
2345 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
2346 | vq->handle_output(vdev, vq); | |
badaf79c XY |
2347 | |
2348 | if (unlikely(vdev->start_on_kick)) { | |
e57f2c31 | 2349 | virtio_set_started(vdev, true); |
badaf79c | 2350 | } |
25db9ebe SH |
2351 | } |
2352 | } | |
2353 | ||
53c25cea PB |
2354 | void virtio_queue_notify(VirtIODevice *vdev, int n) |
2355 | { | |
e49a6618 PB |
2356 | VirtQueue *vq = &vdev->vq[n]; |
2357 | ||
2358 | if (unlikely(!vq->vring.desc || vdev->broken)) { | |
2359 | return; | |
2360 | } | |
2361 | ||
2362 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
fcccb271 | 2363 | if (vq->host_notifier_enabled) { |
e49a6618 PB |
2364 | event_notifier_set(&vq->host_notifier); |
2365 | } else if (vq->handle_output) { | |
2366 | vq->handle_output(vdev, vq); | |
badaf79c | 2367 | |
8b04e2c7 XY |
2368 | if (unlikely(vdev->start_on_kick)) { |
2369 | virtio_set_started(vdev, true); | |
2370 | } | |
badaf79c | 2371 | } |
967f97fa AL |
2372 | } |
2373 | ||
7055e687 MT |
2374 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) |
2375 | { | |
87b3bd1c | 2376 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : |
7055e687 MT |
2377 | VIRTIO_NO_VECTOR; |
2378 | } | |
2379 | ||
2380 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) | |
2381 | { | |
e0d686bf JW |
2382 | VirtQueue *vq = &vdev->vq[n]; |
2383 | ||
87b3bd1c | 2384 | if (n < VIRTIO_QUEUE_MAX) { |
e0d686bf JW |
2385 | if (vdev->vector_queues && |
2386 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { | |
2387 | QLIST_REMOVE(vq, node); | |
2388 | } | |
7055e687 | 2389 | vdev->vq[n].vector = vector; |
e0d686bf JW |
2390 | if (vdev->vector_queues && |
2391 | vector != VIRTIO_NO_VECTOR) { | |
2392 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); | |
2393 | } | |
2394 | } | |
7055e687 MT |
2395 | } |
2396 | ||
f1ac6a55 PB |
2397 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, |
2398 | VirtIOHandleOutput handle_output) | |
967f97fa AL |
2399 | { |
2400 | int i; | |
2401 | ||
87b3bd1c | 2402 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2403 | if (vdev->vq[i].vring.num == 0) |
2404 | break; | |
2405 | } | |
2406 | ||
87b3bd1c | 2407 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) |
967f97fa AL |
2408 | abort(); |
2409 | ||
2410 | vdev->vq[i].vring.num = queue_size; | |
46c5d082 | 2411 | vdev->vq[i].vring.num_default = queue_size; |
6ce69d1c | 2412 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; |
967f97fa | 2413 | vdev->vq[i].handle_output = handle_output; |
344dc16f | 2414 | vdev->vq[i].handle_aio_output = NULL; |
86044b24 JW |
2415 | vdev->vq[i].used_elems = g_malloc0(sizeof(VirtQueueElement) * |
2416 | queue_size); | |
967f97fa AL |
2417 | |
2418 | return &vdev->vq[i]; | |
2419 | } | |
2420 | ||
722f8c51 MT |
2421 | void virtio_delete_queue(VirtQueue *vq) |
2422 | { | |
2423 | vq->vring.num = 0; | |
2424 | vq->vring.num_default = 0; | |
2425 | vq->handle_output = NULL; | |
2426 | vq->handle_aio_output = NULL; | |
2427 | g_free(vq->used_elems); | |
8cd353ea | 2428 | vq->used_elems = NULL; |
421afd2f | 2429 | virtio_virtqueue_reset_region_cache(vq); |
722f8c51 MT |
2430 | } |
2431 | ||
f23fd811 JW |
2432 | void virtio_del_queue(VirtIODevice *vdev, int n) |
2433 | { | |
87b3bd1c | 2434 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { |
f23fd811 JW |
2435 | abort(); |
2436 | } | |
2437 | ||
722f8c51 | 2438 | virtio_delete_queue(&vdev->vq[n]); |
f23fd811 JW |
2439 | } |
2440 | ||
0687c37c PB |
2441 | static void virtio_set_isr(VirtIODevice *vdev, int value) |
2442 | { | |
d73415a3 | 2443 | uint8_t old = qatomic_read(&vdev->isr); |
0687c37c PB |
2444 | |
2445 | /* Do not write ISR if it does not change, so that its cacheline remains | |
2446 | * shared in the common case where the guest does not read it. | |
2447 | */ | |
2448 | if ((old & value) != value) { | |
d73415a3 | 2449 | qatomic_or(&vdev->isr, value); |
0687c37c PB |
2450 | } |
2451 | } | |
2452 | ||
683f7665 | 2453 | static bool virtio_split_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
bcbabae8 MT |
2454 | { |
2455 | uint16_t old, new; | |
2456 | bool v; | |
a281ebc1 MT |
2457 | /* We need to expose used array entries before checking used event. */ |
2458 | smp_mb(); | |
97b83deb | 2459 | /* Always notify when queue is empty (when feature acknowledge) */ |
95129d6f | 2460 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && |
be1fea9b | 2461 | !vq->inuse && virtio_queue_empty(vq)) { |
bcbabae8 MT |
2462 | return true; |
2463 | } | |
2464 | ||
95129d6f | 2465 | if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
bcbabae8 MT |
2466 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); |
2467 | } | |
2468 | ||
2469 | v = vq->signalled_used_valid; | |
2470 | vq->signalled_used_valid = true; | |
2471 | old = vq->signalled_used; | |
b796fcd1 | 2472 | new = vq->signalled_used = vq->used_idx; |
e9600c6c | 2473 | return !v || vring_need_event(vring_get_used_event(vq), new, old); |
bcbabae8 MT |
2474 | } |
2475 | ||
683f7665 JW |
2476 | static bool vring_packed_need_event(VirtQueue *vq, bool wrap, |
2477 | uint16_t off_wrap, uint16_t new, | |
2478 | uint16_t old) | |
2479 | { | |
2480 | int off = off_wrap & ~(1 << 15); | |
2481 | ||
2482 | if (wrap != off_wrap >> 15) { | |
2483 | off -= vq->vring.num; | |
2484 | } | |
2485 | ||
2486 | return vring_need_event(off, new, old); | |
2487 | } | |
2488 | ||
2489 | static bool virtio_packed_should_notify(VirtIODevice *vdev, VirtQueue *vq) | |
2490 | { | |
2491 | VRingPackedDescEvent e; | |
2492 | uint16_t old, new; | |
2493 | bool v; | |
2494 | VRingMemoryRegionCaches *caches; | |
2495 | ||
2496 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
2497 | if (!caches) { |
2498 | return false; | |
2499 | } | |
2500 | ||
683f7665 JW |
2501 | vring_packed_event_read(vdev, &caches->avail, &e); |
2502 | ||
2503 | old = vq->signalled_used; | |
2504 | new = vq->signalled_used = vq->used_idx; | |
2505 | v = vq->signalled_used_valid; | |
2506 | vq->signalled_used_valid = true; | |
2507 | ||
2508 | if (e.flags == VRING_PACKED_EVENT_FLAG_DISABLE) { | |
2509 | return false; | |
2510 | } else if (e.flags == VRING_PACKED_EVENT_FLAG_ENABLE) { | |
2511 | return true; | |
2512 | } | |
2513 | ||
2514 | return !v || vring_packed_need_event(vq, vq->used_wrap_counter, | |
2515 | e.off_wrap, new, old); | |
2516 | } | |
2517 | ||
2518 | /* Called within rcu_read_lock(). */ | |
2519 | static bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq) | |
2520 | { | |
2521 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
2522 | return virtio_packed_should_notify(vdev, vq); | |
2523 | } else { | |
2524 | return virtio_split_should_notify(vdev, vq); | |
2525 | } | |
2526 | } | |
2527 | ||
83d768b5 PB |
2528 | void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq) |
2529 | { | |
b5f53d04 DDAG |
2530 | WITH_RCU_READ_LOCK_GUARD() { |
2531 | if (!virtio_should_notify(vdev, vq)) { | |
2532 | return; | |
2533 | } | |
83d768b5 PB |
2534 | } |
2535 | ||
2536 | trace_virtio_notify_irqfd(vdev, vq); | |
2537 | ||
2538 | /* | |
2539 | * virtio spec 1.0 says ISR bit 0 should be ignored with MSI, but | |
2540 | * windows drivers included in virtio-win 1.8.0 (circa 2015) are | |
2541 | * incorrectly polling this bit during crashdump and hibernation | |
2542 | * in MSI mode, causing a hang if this bit is never updated. | |
2543 | * Recent releases of Windows do not really shut down, but rather | |
2544 | * log out and hibernate to make the next startup faster. Hence, | |
2545 | * this manifested as a more serious hang during shutdown with | |
2546 | * | |
2547 | * Next driver release from 2016 fixed this problem, so working around it | |
2548 | * is not a must, but it's easy to do so let's do it here. | |
2549 | * | |
2550 | * Note: it's safe to update ISR from any thread as it was switched | |
2551 | * to an atomic operation. | |
2552 | */ | |
2553 | virtio_set_isr(vq->vdev, 0x1); | |
2554 | event_notifier_set(&vq->guest_notifier); | |
2555 | } | |
2556 | ||
b4b9862b MT |
2557 | static void virtio_irq(VirtQueue *vq) |
2558 | { | |
2559 | virtio_set_isr(vq->vdev, 0x1); | |
2560 | virtio_notify_vector(vq->vdev, vq->vector); | |
2561 | } | |
2562 | ||
bcbabae8 MT |
2563 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) |
2564 | { | |
b5f53d04 DDAG |
2565 | WITH_RCU_READ_LOCK_GUARD() { |
2566 | if (!virtio_should_notify(vdev, vq)) { | |
2567 | return; | |
2568 | } | |
bcbabae8 | 2569 | } |
967f97fa | 2570 | |
64979a4d | 2571 | trace_virtio_notify(vdev, vq); |
b4b9862b | 2572 | virtio_irq(vq); |
967f97fa AL |
2573 | } |
2574 | ||
2575 | void virtio_notify_config(VirtIODevice *vdev) | |
2576 | { | |
7625162c AL |
2577 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) |
2578 | return; | |
2579 | ||
0687c37c | 2580 | virtio_set_isr(vdev, 0x3); |
b8f05908 | 2581 | vdev->generation++; |
7055e687 | 2582 | virtio_notify_vector(vdev, vdev->config_vector); |
967f97fa AL |
2583 | } |
2584 | ||
616a6552 GK |
2585 | static bool virtio_device_endian_needed(void *opaque) |
2586 | { | |
2587 | VirtIODevice *vdev = opaque; | |
2588 | ||
2589 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); | |
95129d6f | 2590 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
3c185597 CH |
2591 | return vdev->device_endian != virtio_default_endian(); |
2592 | } | |
2593 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
2594 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; | |
616a6552 GK |
2595 | } |
2596 | ||
019a3edb GH |
2597 | static bool virtio_64bit_features_needed(void *opaque) |
2598 | { | |
2599 | VirtIODevice *vdev = opaque; | |
2600 | ||
2601 | return (vdev->host_features >> 32) != 0; | |
2602 | } | |
2603 | ||
74aae7b2 JW |
2604 | static bool virtio_virtqueue_needed(void *opaque) |
2605 | { | |
2606 | VirtIODevice *vdev = opaque; | |
2607 | ||
2608 | return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1); | |
2609 | } | |
2610 | ||
86044b24 JW |
2611 | static bool virtio_packed_virtqueue_needed(void *opaque) |
2612 | { | |
2613 | VirtIODevice *vdev = opaque; | |
2614 | ||
2615 | return virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED); | |
2616 | } | |
2617 | ||
46c5d082 CH |
2618 | static bool virtio_ringsize_needed(void *opaque) |
2619 | { | |
2620 | VirtIODevice *vdev = opaque; | |
2621 | int i; | |
2622 | ||
2623 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
2624 | if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) { | |
2625 | return true; | |
2626 | } | |
2627 | } | |
2628 | return false; | |
2629 | } | |
2630 | ||
a6df8adf JW |
2631 | static bool virtio_extra_state_needed(void *opaque) |
2632 | { | |
2633 | VirtIODevice *vdev = opaque; | |
2634 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2635 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2636 | ||
2637 | return k->has_extra_state && | |
2638 | k->has_extra_state(qbus->parent); | |
2639 | } | |
2640 | ||
791b1daf SH |
2641 | static bool virtio_broken_needed(void *opaque) |
2642 | { | |
2643 | VirtIODevice *vdev = opaque; | |
2644 | ||
2645 | return vdev->broken; | |
2646 | } | |
2647 | ||
badaf79c XY |
2648 | static bool virtio_started_needed(void *opaque) |
2649 | { | |
2650 | VirtIODevice *vdev = opaque; | |
2651 | ||
2652 | return vdev->started; | |
2653 | } | |
2654 | ||
9d7bd082 MR |
2655 | static bool virtio_disabled_needed(void *opaque) |
2656 | { | |
2657 | VirtIODevice *vdev = opaque; | |
2658 | ||
2659 | return vdev->disabled; | |
2660 | } | |
2661 | ||
50e5ae4d | 2662 | static const VMStateDescription vmstate_virtqueue = { |
74aae7b2 | 2663 | .name = "virtqueue_state", |
50e5ae4d DDAG |
2664 | .version_id = 1, |
2665 | .minimum_version_id = 1, | |
2666 | .fields = (VMStateField[]) { | |
2667 | VMSTATE_UINT64(vring.avail, struct VirtQueue), | |
2668 | VMSTATE_UINT64(vring.used, struct VirtQueue), | |
2669 | VMSTATE_END_OF_LIST() | |
2670 | } | |
74aae7b2 JW |
2671 | }; |
2672 | ||
86044b24 JW |
2673 | static const VMStateDescription vmstate_packed_virtqueue = { |
2674 | .name = "packed_virtqueue_state", | |
2675 | .version_id = 1, | |
2676 | .minimum_version_id = 1, | |
2677 | .fields = (VMStateField[]) { | |
2678 | VMSTATE_UINT16(last_avail_idx, struct VirtQueue), | |
2679 | VMSTATE_BOOL(last_avail_wrap_counter, struct VirtQueue), | |
2680 | VMSTATE_UINT16(used_idx, struct VirtQueue), | |
2681 | VMSTATE_BOOL(used_wrap_counter, struct VirtQueue), | |
2682 | VMSTATE_UINT32(inuse, struct VirtQueue), | |
2683 | VMSTATE_END_OF_LIST() | |
2684 | } | |
2685 | }; | |
2686 | ||
74aae7b2 JW |
2687 | static const VMStateDescription vmstate_virtio_virtqueues = { |
2688 | .name = "virtio/virtqueues", | |
2689 | .version_id = 1, | |
2690 | .minimum_version_id = 1, | |
2691 | .needed = &virtio_virtqueue_needed, | |
2692 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
2693 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
2694 | VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue), | |
74aae7b2 JW |
2695 | VMSTATE_END_OF_LIST() |
2696 | } | |
2697 | }; | |
2698 | ||
86044b24 JW |
2699 | static const VMStateDescription vmstate_virtio_packed_virtqueues = { |
2700 | .name = "virtio/packed_virtqueues", | |
2701 | .version_id = 1, | |
2702 | .minimum_version_id = 1, | |
2703 | .needed = &virtio_packed_virtqueue_needed, | |
2704 | .fields = (VMStateField[]) { | |
2705 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, | |
2706 | VIRTIO_QUEUE_MAX, 0, vmstate_packed_virtqueue, VirtQueue), | |
2707 | VMSTATE_END_OF_LIST() | |
2708 | } | |
2709 | }; | |
2710 | ||
50e5ae4d | 2711 | static const VMStateDescription vmstate_ringsize = { |
46c5d082 | 2712 | .name = "ringsize_state", |
50e5ae4d DDAG |
2713 | .version_id = 1, |
2714 | .minimum_version_id = 1, | |
2715 | .fields = (VMStateField[]) { | |
2716 | VMSTATE_UINT32(vring.num_default, struct VirtQueue), | |
2717 | VMSTATE_END_OF_LIST() | |
2718 | } | |
46c5d082 CH |
2719 | }; |
2720 | ||
2721 | static const VMStateDescription vmstate_virtio_ringsize = { | |
2722 | .name = "virtio/ringsize", | |
2723 | .version_id = 1, | |
2724 | .minimum_version_id = 1, | |
2725 | .needed = &virtio_ringsize_needed, | |
2726 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
2727 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
2728 | VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue), | |
46c5d082 CH |
2729 | VMSTATE_END_OF_LIST() |
2730 | } | |
2731 | }; | |
2732 | ||
2c21ee76 | 2733 | static int get_extra_state(QEMUFile *f, void *pv, size_t size, |
03fee66f | 2734 | const VMStateField *field) |
a6df8adf JW |
2735 | { |
2736 | VirtIODevice *vdev = pv; | |
2737 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2738 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2739 | ||
2740 | if (!k->load_extra_state) { | |
2741 | return -1; | |
2742 | } else { | |
2743 | return k->load_extra_state(qbus->parent, f); | |
2744 | } | |
2745 | } | |
2746 | ||
2c21ee76 | 2747 | static int put_extra_state(QEMUFile *f, void *pv, size_t size, |
3ddba9a9 | 2748 | const VMStateField *field, JSONWriter *vmdesc) |
a6df8adf JW |
2749 | { |
2750 | VirtIODevice *vdev = pv; | |
2751 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2752 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2753 | ||
2754 | k->save_extra_state(qbus->parent, f); | |
2c21ee76 | 2755 | return 0; |
a6df8adf JW |
2756 | } |
2757 | ||
2758 | static const VMStateInfo vmstate_info_extra_state = { | |
2759 | .name = "virtqueue_extra_state", | |
2760 | .get = get_extra_state, | |
2761 | .put = put_extra_state, | |
2762 | }; | |
2763 | ||
2764 | static const VMStateDescription vmstate_virtio_extra_state = { | |
2765 | .name = "virtio/extra_state", | |
2766 | .version_id = 1, | |
2767 | .minimum_version_id = 1, | |
2768 | .needed = &virtio_extra_state_needed, | |
2769 | .fields = (VMStateField[]) { | |
2770 | { | |
2771 | .name = "extra_state", | |
2772 | .version_id = 0, | |
2773 | .field_exists = NULL, | |
2774 | .size = 0, | |
2775 | .info = &vmstate_info_extra_state, | |
2776 | .flags = VMS_SINGLE, | |
2777 | .offset = 0, | |
2778 | }, | |
2779 | VMSTATE_END_OF_LIST() | |
2780 | } | |
2781 | }; | |
2782 | ||
616a6552 GK |
2783 | static const VMStateDescription vmstate_virtio_device_endian = { |
2784 | .name = "virtio/device_endian", | |
2785 | .version_id = 1, | |
2786 | .minimum_version_id = 1, | |
5cd8cada | 2787 | .needed = &virtio_device_endian_needed, |
616a6552 GK |
2788 | .fields = (VMStateField[]) { |
2789 | VMSTATE_UINT8(device_endian, VirtIODevice), | |
2790 | VMSTATE_END_OF_LIST() | |
2791 | } | |
2792 | }; | |
2793 | ||
019a3edb GH |
2794 | static const VMStateDescription vmstate_virtio_64bit_features = { |
2795 | .name = "virtio/64bit_features", | |
2796 | .version_id = 1, | |
2797 | .minimum_version_id = 1, | |
5cd8cada | 2798 | .needed = &virtio_64bit_features_needed, |
019a3edb GH |
2799 | .fields = (VMStateField[]) { |
2800 | VMSTATE_UINT64(guest_features, VirtIODevice), | |
2801 | VMSTATE_END_OF_LIST() | |
2802 | } | |
2803 | }; | |
2804 | ||
791b1daf SH |
2805 | static const VMStateDescription vmstate_virtio_broken = { |
2806 | .name = "virtio/broken", | |
2807 | .version_id = 1, | |
2808 | .minimum_version_id = 1, | |
2809 | .needed = &virtio_broken_needed, | |
2810 | .fields = (VMStateField[]) { | |
2811 | VMSTATE_BOOL(broken, VirtIODevice), | |
2812 | VMSTATE_END_OF_LIST() | |
2813 | } | |
2814 | }; | |
2815 | ||
badaf79c XY |
2816 | static const VMStateDescription vmstate_virtio_started = { |
2817 | .name = "virtio/started", | |
2818 | .version_id = 1, | |
2819 | .minimum_version_id = 1, | |
2820 | .needed = &virtio_started_needed, | |
2821 | .fields = (VMStateField[]) { | |
2822 | VMSTATE_BOOL(started, VirtIODevice), | |
2823 | VMSTATE_END_OF_LIST() | |
2824 | } | |
2825 | }; | |
2826 | ||
9d7bd082 MR |
2827 | static const VMStateDescription vmstate_virtio_disabled = { |
2828 | .name = "virtio/disabled", | |
2829 | .version_id = 1, | |
2830 | .minimum_version_id = 1, | |
2831 | .needed = &virtio_disabled_needed, | |
2832 | .fields = (VMStateField[]) { | |
2833 | VMSTATE_BOOL(disabled, VirtIODevice), | |
2834 | VMSTATE_END_OF_LIST() | |
2835 | } | |
2836 | }; | |
2837 | ||
6b321a3d GK |
2838 | static const VMStateDescription vmstate_virtio = { |
2839 | .name = "virtio", | |
2840 | .version_id = 1, | |
2841 | .minimum_version_id = 1, | |
2842 | .minimum_version_id_old = 1, | |
2843 | .fields = (VMStateField[]) { | |
2844 | VMSTATE_END_OF_LIST() | |
616a6552 | 2845 | }, |
5cd8cada JQ |
2846 | .subsections = (const VMStateDescription*[]) { |
2847 | &vmstate_virtio_device_endian, | |
2848 | &vmstate_virtio_64bit_features, | |
74aae7b2 | 2849 | &vmstate_virtio_virtqueues, |
46c5d082 | 2850 | &vmstate_virtio_ringsize, |
791b1daf | 2851 | &vmstate_virtio_broken, |
a6df8adf | 2852 | &vmstate_virtio_extra_state, |
badaf79c | 2853 | &vmstate_virtio_started, |
86044b24 | 2854 | &vmstate_virtio_packed_virtqueues, |
9d7bd082 | 2855 | &vmstate_virtio_disabled, |
5cd8cada | 2856 | NULL |
6b321a3d GK |
2857 | } |
2858 | }; | |
2859 | ||
2f168d07 | 2860 | int virtio_save(VirtIODevice *vdev, QEMUFile *f) |
967f97fa | 2861 | { |
1c819449 FK |
2862 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
2863 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 2864 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
019a3edb | 2865 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); |
967f97fa AL |
2866 | int i; |
2867 | ||
1c819449 FK |
2868 | if (k->save_config) { |
2869 | k->save_config(qbus->parent, f); | |
2870 | } | |
967f97fa | 2871 | |
967f97fa AL |
2872 | qemu_put_8s(f, &vdev->status); |
2873 | qemu_put_8s(f, &vdev->isr); | |
2874 | qemu_put_be16s(f, &vdev->queue_sel); | |
019a3edb | 2875 | qemu_put_be32s(f, &guest_features_lo); |
967f97fa AL |
2876 | qemu_put_be32(f, vdev->config_len); |
2877 | qemu_put_buffer(f, vdev->config, vdev->config_len); | |
2878 | ||
87b3bd1c | 2879 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2880 | if (vdev->vq[i].vring.num == 0) |
2881 | break; | |
2882 | } | |
2883 | ||
2884 | qemu_put_be32(f, i); | |
2885 | ||
87b3bd1c | 2886 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2887 | if (vdev->vq[i].vring.num == 0) |
2888 | break; | |
2889 | ||
2890 | qemu_put_be32(f, vdev->vq[i].vring.num); | |
6ce69d1c PM |
2891 | if (k->has_variable_vring_alignment) { |
2892 | qemu_put_be32(f, vdev->vq[i].vring.align); | |
2893 | } | |
874adf45 SH |
2894 | /* |
2895 | * Save desc now, the rest of the ring addresses are saved in | |
2896 | * subsections for VIRTIO-1 devices. | |
2897 | */ | |
ab223c95 | 2898 | qemu_put_be64(f, vdev->vq[i].vring.desc); |
967f97fa | 2899 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
1c819449 FK |
2900 | if (k->save_queue) { |
2901 | k->save_queue(qbus->parent, i, f); | |
2902 | } | |
967f97fa | 2903 | } |
1b5fc0de GK |
2904 | |
2905 | if (vdc->save != NULL) { | |
2906 | vdc->save(vdev, f); | |
2907 | } | |
6b321a3d | 2908 | |
ea43e259 | 2909 | if (vdc->vmsd) { |
2f168d07 DDAG |
2910 | int ret = vmstate_save_state(f, vdc->vmsd, vdev, NULL); |
2911 | if (ret) { | |
2912 | return ret; | |
2913 | } | |
ea43e259 DDAG |
2914 | } |
2915 | ||
6b321a3d | 2916 | /* Subsections */ |
2f168d07 | 2917 | return vmstate_save_state(f, &vmstate_virtio, vdev, NULL); |
967f97fa AL |
2918 | } |
2919 | ||
1a665855 | 2920 | /* A wrapper for use as a VMState .put function */ |
2c21ee76 | 2921 | static int virtio_device_put(QEMUFile *f, void *opaque, size_t size, |
3ddba9a9 | 2922 | const VMStateField *field, JSONWriter *vmdesc) |
1a665855 | 2923 | { |
2f168d07 | 2924 | return virtio_save(VIRTIO_DEVICE(opaque), f); |
1a665855 HP |
2925 | } |
2926 | ||
2927 | /* A wrapper for use as a VMState .get function */ | |
2c21ee76 | 2928 | static int virtio_device_get(QEMUFile *f, void *opaque, size_t size, |
03fee66f | 2929 | const VMStateField *field) |
1a665855 HP |
2930 | { |
2931 | VirtIODevice *vdev = VIRTIO_DEVICE(opaque); | |
2932 | DeviceClass *dc = DEVICE_CLASS(VIRTIO_DEVICE_GET_CLASS(vdev)); | |
2933 | ||
2934 | return virtio_load(vdev, f, dc->vmsd->version_id); | |
2935 | } | |
2936 | ||
2937 | const VMStateInfo virtio_vmstate_info = { | |
2938 | .name = "virtio", | |
2939 | .get = virtio_device_get, | |
2940 | .put = virtio_device_put, | |
2941 | }; | |
2942 | ||
6c0196d7 | 2943 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) |
ad0c9332 | 2944 | { |
181103cd | 2945 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
6b8f1020 | 2946 | bool bad = (val & ~(vdev->host_features)) != 0; |
ad0c9332 | 2947 | |
6b8f1020 | 2948 | val &= vdev->host_features; |
181103cd FK |
2949 | if (k->set_features) { |
2950 | k->set_features(vdev, val); | |
ad0c9332 PB |
2951 | } |
2952 | vdev->guest_features = val; | |
2953 | return bad ? -1 : 0; | |
2954 | } | |
2955 | ||
6c0196d7 CH |
2956 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) |
2957 | { | |
db812c40 PB |
2958 | int ret; |
2959 | /* | |
6c0196d7 CH |
2960 | * The driver must not attempt to set features after feature negotiation |
2961 | * has finished. | |
2962 | */ | |
2963 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { | |
2964 | return -EINVAL; | |
2965 | } | |
db812c40 | 2966 | ret = virtio_set_features_nocheck(vdev, val); |
2d69eba5 LQ |
2967 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
2968 | /* VIRTIO_RING_F_EVENT_IDX changes the size of the caches. */ | |
2969 | int i; | |
2970 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
2971 | if (vdev->vq[i].vring.num != 0) { | |
2972 | virtio_init_region_cache(vdev, i); | |
db812c40 PB |
2973 | } |
2974 | } | |
2d69eba5 LQ |
2975 | } |
2976 | if (!ret) { | |
868a8f44 XY |
2977 | if (!virtio_device_started(vdev, vdev->status) && |
2978 | !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
2979 | vdev->start_on_kick = true; | |
2980 | } | |
db812c40 PB |
2981 | } |
2982 | return ret; | |
6c0196d7 CH |
2983 | } |
2984 | ||
ba550851 SG |
2985 | size_t virtio_feature_get_config_size(VirtIOFeature *feature_sizes, |
2986 | uint64_t host_features) | |
2987 | { | |
2988 | size_t config_size = 0; | |
2989 | int i; | |
2990 | ||
2991 | for (i = 0; feature_sizes[i].flags != 0; i++) { | |
2992 | if (host_features & feature_sizes[i].flags) { | |
2993 | config_size = MAX(feature_sizes[i].end, config_size); | |
2994 | } | |
2995 | } | |
2996 | ||
2997 | return config_size; | |
2998 | } | |
2999 | ||
1b5fc0de | 3000 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |
967f97fa | 3001 | { |
cc459952 | 3002 | int i, ret; |
a890a2f9 | 3003 | int32_t config_len; |
cc459952 | 3004 | uint32_t num; |
6d74ca5a | 3005 | uint32_t features; |
1c819449 FK |
3006 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3007 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 3008 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa | 3009 | |
616a6552 GK |
3010 | /* |
3011 | * We poison the endianness to ensure it does not get used before | |
3012 | * subsections have been loaded. | |
3013 | */ | |
3014 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; | |
3015 | ||
1c819449 FK |
3016 | if (k->load_config) { |
3017 | ret = k->load_config(qbus->parent, f); | |
ff24bd58 MT |
3018 | if (ret) |
3019 | return ret; | |
3020 | } | |
967f97fa | 3021 | |
967f97fa AL |
3022 | qemu_get_8s(f, &vdev->status); |
3023 | qemu_get_8s(f, &vdev->isr); | |
3024 | qemu_get_be16s(f, &vdev->queue_sel); | |
87b3bd1c | 3025 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { |
4b53c2c7 MR |
3026 | return -1; |
3027 | } | |
6d74ca5a | 3028 | qemu_get_be32s(f, &features); |
ad0c9332 | 3029 | |
62cee1a2 MT |
3030 | /* |
3031 | * Temporarily set guest_features low bits - needed by | |
3032 | * virtio net load code testing for VIRTIO_NET_F_CTRL_GUEST_OFFLOADS | |
3033 | * VIRTIO_NET_F_GUEST_ANNOUNCE and VIRTIO_NET_F_CTRL_VQ. | |
3034 | * | |
3035 | * Note: devices should always test host features in future - don't create | |
3036 | * new dependencies like this. | |
3037 | */ | |
3038 | vdev->guest_features = features; | |
3039 | ||
a890a2f9 | 3040 | config_len = qemu_get_be32(f); |
2f5732e9 DDAG |
3041 | |
3042 | /* | |
3043 | * There are cases where the incoming config can be bigger or smaller | |
3044 | * than what we have; so load what we have space for, and skip | |
3045 | * any excess that's in the stream. | |
3046 | */ | |
3047 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); | |
3048 | ||
3049 | while (config_len > vdev->config_len) { | |
3050 | qemu_get_byte(f); | |
3051 | config_len--; | |
a890a2f9 | 3052 | } |
967f97fa AL |
3053 | |
3054 | num = qemu_get_be32(f); | |
3055 | ||
87b3bd1c | 3056 | if (num > VIRTIO_QUEUE_MAX) { |
8a1be662 | 3057 | error_report("Invalid number of virtqueues: 0x%x", num); |
cc459952 MT |
3058 | return -1; |
3059 | } | |
3060 | ||
967f97fa AL |
3061 | for (i = 0; i < num; i++) { |
3062 | vdev->vq[i].vring.num = qemu_get_be32(f); | |
6ce69d1c PM |
3063 | if (k->has_variable_vring_alignment) { |
3064 | vdev->vq[i].vring.align = qemu_get_be32(f); | |
3065 | } | |
ab223c95 | 3066 | vdev->vq[i].vring.desc = qemu_get_be64(f); |
967f97fa | 3067 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
bcbabae8 | 3068 | vdev->vq[i].signalled_used_valid = false; |
332fa82d | 3069 | vdev->vq[i].notification = true; |
967f97fa | 3070 | |
874adf45 | 3071 | if (!vdev->vq[i].vring.desc && vdev->vq[i].last_avail_idx) { |
1abeb5a6 | 3072 | error_report("VQ %d address 0x0 " |
6daf194d | 3073 | "inconsistent with Host index 0x%x", |
1abeb5a6 | 3074 | i, vdev->vq[i].last_avail_idx); |
874adf45 | 3075 | return -1; |
8275e2f6 | 3076 | } |
1c819449 FK |
3077 | if (k->load_queue) { |
3078 | ret = k->load_queue(qbus->parent, i, f); | |
ff24bd58 MT |
3079 | if (ret) |
3080 | return ret; | |
7055e687 | 3081 | } |
967f97fa AL |
3082 | } |
3083 | ||
7055e687 | 3084 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
1b5fc0de GK |
3085 | |
3086 | if (vdc->load != NULL) { | |
6b321a3d GK |
3087 | ret = vdc->load(vdev, f, version_id); |
3088 | if (ret) { | |
3089 | return ret; | |
3090 | } | |
1b5fc0de GK |
3091 | } |
3092 | ||
ea43e259 DDAG |
3093 | if (vdc->vmsd) { |
3094 | ret = vmstate_load_state(f, vdc->vmsd, vdev, version_id); | |
3095 | if (ret) { | |
3096 | return ret; | |
3097 | } | |
3098 | } | |
3099 | ||
616a6552 GK |
3100 | /* Subsections */ |
3101 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); | |
3102 | if (ret) { | |
3103 | return ret; | |
3104 | } | |
3105 | ||
3106 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { | |
3107 | vdev->device_endian = virtio_default_endian(); | |
3108 | } | |
3109 | ||
019a3edb GH |
3110 | if (virtio_64bit_features_needed(vdev)) { |
3111 | /* | |
3112 | * Subsection load filled vdev->guest_features. Run them | |
3113 | * through virtio_set_features to sanity-check them against | |
3114 | * host_features. | |
3115 | */ | |
3116 | uint64_t features64 = vdev->guest_features; | |
6c0196d7 | 3117 | if (virtio_set_features_nocheck(vdev, features64) < 0) { |
019a3edb GH |
3118 | error_report("Features 0x%" PRIx64 " unsupported. " |
3119 | "Allowed features: 0x%" PRIx64, | |
3120 | features64, vdev->host_features); | |
3121 | return -1; | |
3122 | } | |
3123 | } else { | |
6c0196d7 | 3124 | if (virtio_set_features_nocheck(vdev, features) < 0) { |
019a3edb GH |
3125 | error_report("Features 0x%x unsupported. " |
3126 | "Allowed features: 0x%" PRIx64, | |
3127 | features, vdev->host_features); | |
3128 | return -1; | |
3129 | } | |
3130 | } | |
3131 | ||
868a8f44 XY |
3132 | if (!virtio_device_started(vdev, vdev->status) && |
3133 | !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
3134 | vdev->start_on_kick = true; | |
3135 | } | |
3136 | ||
b5f53d04 | 3137 | RCU_READ_LOCK_GUARD(); |
616a6552 | 3138 | for (i = 0; i < num; i++) { |
ab223c95 | 3139 | if (vdev->vq[i].vring.desc) { |
616a6552 | 3140 | uint16_t nheads; |
874adf45 SH |
3141 | |
3142 | /* | |
3143 | * VIRTIO-1 devices migrate desc, used, and avail ring addresses so | |
3144 | * only the region cache needs to be set up. Legacy devices need | |
3145 | * to calculate used and avail ring addresses based on the desc | |
3146 | * address. | |
3147 | */ | |
3148 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
3149 | virtio_init_region_cache(vdev, i); | |
3150 | } else { | |
3151 | virtio_queue_update_rings(vdev, i); | |
3152 | } | |
3153 | ||
86044b24 JW |
3154 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3155 | vdev->vq[i].shadow_avail_idx = vdev->vq[i].last_avail_idx; | |
3156 | vdev->vq[i].shadow_avail_wrap_counter = | |
3157 | vdev->vq[i].last_avail_wrap_counter; | |
3158 | continue; | |
3159 | } | |
3160 | ||
616a6552 GK |
3161 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; |
3162 | /* Check it isn't doing strange things with descriptor numbers. */ | |
3163 | if (nheads > vdev->vq[i].vring.num) { | |
4aedda25 JL |
3164 | virtio_error(vdev, "VQ %d size 0x%x Guest index 0x%x " |
3165 | "inconsistent with Host index 0x%x: delta 0x%x", | |
3166 | i, vdev->vq[i].vring.num, | |
3167 | vring_avail_idx(&vdev->vq[i]), | |
3168 | vdev->vq[i].last_avail_idx, nheads); | |
3169 | vdev->vq[i].used_idx = 0; | |
3170 | vdev->vq[i].shadow_avail_idx = 0; | |
3171 | vdev->vq[i].inuse = 0; | |
3172 | continue; | |
616a6552 | 3173 | } |
b796fcd1 | 3174 | vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]); |
be1fea9b | 3175 | vdev->vq[i].shadow_avail_idx = vring_avail_idx(&vdev->vq[i]); |
bccdef6b SH |
3176 | |
3177 | /* | |
3178 | * Some devices migrate VirtQueueElements that have been popped | |
3179 | * from the avail ring but not yet returned to the used ring. | |
e66bcc40 HP |
3180 | * Since max ring size < UINT16_MAX it's safe to use modulo |
3181 | * UINT16_MAX + 1 subtraction. | |
bccdef6b | 3182 | */ |
e66bcc40 HP |
3183 | vdev->vq[i].inuse = (uint16_t)(vdev->vq[i].last_avail_idx - |
3184 | vdev->vq[i].used_idx); | |
bccdef6b SH |
3185 | if (vdev->vq[i].inuse > vdev->vq[i].vring.num) { |
3186 | error_report("VQ %d size 0x%x < last_avail_idx 0x%x - " | |
3187 | "used_idx 0x%x", | |
3188 | i, vdev->vq[i].vring.num, | |
3189 | vdev->vq[i].last_avail_idx, | |
3190 | vdev->vq[i].used_idx); | |
3191 | return -1; | |
3192 | } | |
616a6552 GK |
3193 | } |
3194 | } | |
3195 | ||
1dd71383 MT |
3196 | if (vdc->post_load) { |
3197 | ret = vdc->post_load(vdev); | |
3198 | if (ret) { | |
3199 | return ret; | |
3200 | } | |
3201 | } | |
3202 | ||
616a6552 | 3203 | return 0; |
967f97fa AL |
3204 | } |
3205 | ||
6a1a8cc7 | 3206 | void virtio_cleanup(VirtIODevice *vdev) |
b946a153 | 3207 | { |
85cf2a8d | 3208 | qemu_del_vm_change_state_handler(vdev->vmstate); |
8e05db92 FK |
3209 | } |
3210 | ||
538f0497 | 3211 | static void virtio_vmstate_change(void *opaque, bool running, RunState state) |
85cf2a8d MT |
3212 | { |
3213 | VirtIODevice *vdev = opaque; | |
1c819449 FK |
3214 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3215 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
e57f2c31 | 3216 | bool backend_run = running && virtio_device_started(vdev, vdev->status); |
9e8e8c48 | 3217 | vdev->vm_running = running; |
85cf2a8d MT |
3218 | |
3219 | if (backend_run) { | |
3220 | virtio_set_status(vdev, vdev->status); | |
3221 | } | |
3222 | ||
1c819449 FK |
3223 | if (k->vmstate_change) { |
3224 | k->vmstate_change(qbus->parent, backend_run); | |
85cf2a8d MT |
3225 | } |
3226 | ||
3227 | if (!backend_run) { | |
3228 | virtio_set_status(vdev, vdev->status); | |
3229 | } | |
3230 | } | |
3231 | ||
c8075caf GA |
3232 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
3233 | size_t vdev_size, const char *vdev_name) | |
3234 | { | |
3235 | DeviceState *vdev = data; | |
3236 | ||
9fc7fc4d MA |
3237 | object_initialize_child_with_props(proxy_obj, "virtio-backend", vdev, |
3238 | vdev_size, vdev_name, &error_abort, | |
3239 | NULL); | |
c8075caf GA |
3240 | qdev_alias_all_properties(vdev, proxy_obj); |
3241 | } | |
3242 | ||
8e05db92 FK |
3243 | void virtio_init(VirtIODevice *vdev, const char *name, |
3244 | uint16_t device_id, size_t config_size) | |
967f97fa | 3245 | { |
e0d686bf JW |
3246 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3247 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
b8193adb | 3248 | int i; |
e0d686bf JW |
3249 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; |
3250 | ||
3251 | if (nvectors) { | |
3252 | vdev->vector_queues = | |
3253 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); | |
3254 | } | |
3255 | ||
868a8f44 | 3256 | vdev->start_on_kick = false; |
badaf79c | 3257 | vdev->started = false; |
53c25cea | 3258 | vdev->device_id = device_id; |
967f97fa | 3259 | vdev->status = 0; |
d73415a3 | 3260 | qatomic_set(&vdev->isr, 0); |
967f97fa | 3261 | vdev->queue_sel = 0; |
7055e687 | 3262 | vdev->config_vector = VIRTIO_NO_VECTOR; |
87b3bd1c | 3263 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); |
1354869c | 3264 | vdev->vm_running = runstate_is_running(); |
f5ed3663 | 3265 | vdev->broken = false; |
87b3bd1c | 3266 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
b8193adb | 3267 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
1cbdabe2 | 3268 | vdev->vq[i].vdev = vdev; |
e78a2b42 | 3269 | vdev->vq[i].queue_index = i; |
fcccb271 | 3270 | vdev->vq[i].host_notifier_enabled = false; |
1cbdabe2 | 3271 | } |
967f97fa | 3272 | |
967f97fa AL |
3273 | vdev->name = name; |
3274 | vdev->config_len = config_size; | |
8e05db92 | 3275 | if (vdev->config_len) { |
7267c094 | 3276 | vdev->config = g_malloc0(config_size); |
8e05db92 | 3277 | } else { |
967f97fa | 3278 | vdev->config = NULL; |
8e05db92 | 3279 | } |
1a8c091c SH |
3280 | vdev->vmstate = qdev_add_vm_change_state_handler(DEVICE(vdev), |
3281 | virtio_vmstate_change, vdev); | |
616a6552 | 3282 | vdev->device_endian = virtio_default_endian(); |
5669655a | 3283 | vdev->use_guest_notifier_mask = true; |
8e05db92 | 3284 | } |
967f97fa | 3285 | |
7c78bdd7 CH |
3286 | /* |
3287 | * Only devices that have already been around prior to defining the virtio | |
3288 | * standard support legacy mode; this includes devices not specified in the | |
3289 | * standard. All newer devices conform to the virtio standard only. | |
3290 | */ | |
3291 | bool virtio_legacy_allowed(VirtIODevice *vdev) | |
3292 | { | |
3293 | switch (vdev->device_id) { | |
3294 | case VIRTIO_ID_NET: | |
3295 | case VIRTIO_ID_BLOCK: | |
3296 | case VIRTIO_ID_CONSOLE: | |
3297 | case VIRTIO_ID_RNG: | |
3298 | case VIRTIO_ID_BALLOON: | |
3299 | case VIRTIO_ID_RPMSG: | |
3300 | case VIRTIO_ID_SCSI: | |
3301 | case VIRTIO_ID_9P: | |
3302 | case VIRTIO_ID_RPROC_SERIAL: | |
3303 | case VIRTIO_ID_CAIF: | |
3304 | return true; | |
3305 | default: | |
3306 | return false; | |
3307 | } | |
3308 | } | |
3309 | ||
d55f5182 SG |
3310 | bool virtio_legacy_check_disabled(VirtIODevice *vdev) |
3311 | { | |
3312 | return vdev->disable_legacy_check; | |
3313 | } | |
3314 | ||
a8170e5e | 3315 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3316 | { |
3317 | return vdev->vq[n].vring.desc; | |
3318 | } | |
3319 | ||
0c9753eb LV |
3320 | bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n) |
3321 | { | |
3322 | return virtio_queue_get_desc_addr(vdev, n) != 0; | |
3323 | } | |
3324 | ||
23bfaf77 JW |
3325 | bool virtio_queue_enabled(VirtIODevice *vdev, int n) |
3326 | { | |
b2a5f62a JW |
3327 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3328 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
3329 | ||
3330 | if (k->queue_enabled) { | |
3331 | return k->queue_enabled(qbus->parent, n); | |
3332 | } | |
0c9753eb | 3333 | return virtio_queue_enabled_legacy(vdev, n); |
23bfaf77 JW |
3334 | } |
3335 | ||
a8170e5e | 3336 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3337 | { |
3338 | return vdev->vq[n].vring.avail; | |
3339 | } | |
3340 | ||
a8170e5e | 3341 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3342 | { |
3343 | return vdev->vq[n].vring.used; | |
3344 | } | |
3345 | ||
a8170e5e | 3346 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3347 | { |
3348 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; | |
3349 | } | |
3350 | ||
a8170e5e | 3351 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) |
1cbdabe2 | 3352 | { |
f90cda63 WX |
3353 | int s; |
3354 | ||
86044b24 JW |
3355 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3356 | return sizeof(struct VRingPackedDescEvent); | |
3357 | } | |
3358 | ||
f90cda63 | 3359 | s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; |
1cbdabe2 | 3360 | return offsetof(VRingAvail, ring) + |
f90cda63 | 3361 | sizeof(uint16_t) * vdev->vq[n].vring.num + s; |
1cbdabe2 MT |
3362 | } |
3363 | ||
a8170e5e | 3364 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) |
1cbdabe2 | 3365 | { |
f90cda63 WX |
3366 | int s; |
3367 | ||
86044b24 JW |
3368 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3369 | return sizeof(struct VRingPackedDescEvent); | |
3370 | } | |
3371 | ||
f90cda63 | 3372 | s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; |
1cbdabe2 | 3373 | return offsetof(VRingUsed, ring) + |
f90cda63 | 3374 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num + s; |
1cbdabe2 MT |
3375 | } |
3376 | ||
86044b24 JW |
3377 | static unsigned int virtio_queue_packed_get_last_avail_idx(VirtIODevice *vdev, |
3378 | int n) | |
3379 | { | |
3380 | unsigned int avail, used; | |
3381 | ||
3382 | avail = vdev->vq[n].last_avail_idx; | |
3383 | avail |= ((uint16_t)vdev->vq[n].last_avail_wrap_counter) << 15; | |
3384 | ||
3385 | used = vdev->vq[n].used_idx; | |
3386 | used |= ((uint16_t)vdev->vq[n].used_wrap_counter) << 15; | |
3387 | ||
3388 | return avail | used << 16; | |
3389 | } | |
3390 | ||
3391 | static uint16_t virtio_queue_split_get_last_avail_idx(VirtIODevice *vdev, | |
3392 | int n) | |
1cbdabe2 MT |
3393 | { |
3394 | return vdev->vq[n].last_avail_idx; | |
3395 | } | |
3396 | ||
86044b24 | 3397 | unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) |
1cbdabe2 | 3398 | { |
86044b24 JW |
3399 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3400 | return virtio_queue_packed_get_last_avail_idx(vdev, n); | |
3401 | } else { | |
3402 | return virtio_queue_split_get_last_avail_idx(vdev, n); | |
3403 | } | |
1cbdabe2 MT |
3404 | } |
3405 | ||
86044b24 JW |
3406 | static void virtio_queue_packed_set_last_avail_idx(VirtIODevice *vdev, |
3407 | int n, unsigned int idx) | |
3408 | { | |
3409 | struct VirtQueue *vq = &vdev->vq[n]; | |
3410 | ||
3411 | vq->last_avail_idx = vq->shadow_avail_idx = idx & 0x7fff; | |
3412 | vq->last_avail_wrap_counter = | |
3413 | vq->shadow_avail_wrap_counter = !!(idx & 0x8000); | |
3414 | idx >>= 16; | |
3415 | vq->used_idx = idx & 0x7ffff; | |
3416 | vq->used_wrap_counter = !!(idx & 0x8000); | |
3417 | } | |
3418 | ||
3419 | static void virtio_queue_split_set_last_avail_idx(VirtIODevice *vdev, | |
3420 | int n, unsigned int idx) | |
3421 | { | |
3422 | vdev->vq[n].last_avail_idx = idx; | |
3423 | vdev->vq[n].shadow_avail_idx = idx; | |
3424 | } | |
3425 | ||
3426 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, | |
3427 | unsigned int idx) | |
3428 | { | |
3429 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3430 | virtio_queue_packed_set_last_avail_idx(vdev, n, idx); | |
3431 | } else { | |
3432 | virtio_queue_split_set_last_avail_idx(vdev, n, idx); | |
3433 | } | |
3434 | } | |
3435 | ||
3436 | static void virtio_queue_packed_restore_last_avail_idx(VirtIODevice *vdev, | |
3437 | int n) | |
3438 | { | |
3439 | /* We don't have a reference like avail idx in shared memory */ | |
3440 | return; | |
3441 | } | |
3442 | ||
3443 | static void virtio_queue_split_restore_last_avail_idx(VirtIODevice *vdev, | |
3444 | int n) | |
2d4ba6cc | 3445 | { |
b5f53d04 | 3446 | RCU_READ_LOCK_GUARD(); |
2d4ba6cc MC |
3447 | if (vdev->vq[n].vring.desc) { |
3448 | vdev->vq[n].last_avail_idx = vring_used_idx(&vdev->vq[n]); | |
3449 | vdev->vq[n].shadow_avail_idx = vdev->vq[n].last_avail_idx; | |
3450 | } | |
2d4ba6cc MC |
3451 | } |
3452 | ||
86044b24 JW |
3453 | void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n) |
3454 | { | |
3455 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3456 | virtio_queue_packed_restore_last_avail_idx(vdev, n); | |
3457 | } else { | |
3458 | virtio_queue_split_restore_last_avail_idx(vdev, n); | |
3459 | } | |
3460 | } | |
3461 | ||
3462 | static void virtio_queue_packed_update_used_idx(VirtIODevice *vdev, int n) | |
3463 | { | |
3464 | /* used idx was updated through set_last_avail_idx() */ | |
3465 | return; | |
3466 | } | |
3467 | ||
3468 | static void virtio_split_packed_update_used_idx(VirtIODevice *vdev, int n) | |
312d3b35 | 3469 | { |
b5f53d04 | 3470 | RCU_READ_LOCK_GUARD(); |
ca0176ad PB |
3471 | if (vdev->vq[n].vring.desc) { |
3472 | vdev->vq[n].used_idx = vring_used_idx(&vdev->vq[n]); | |
3473 | } | |
312d3b35 YB |
3474 | } |
3475 | ||
86044b24 JW |
3476 | void virtio_queue_update_used_idx(VirtIODevice *vdev, int n) |
3477 | { | |
3478 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3479 | return virtio_queue_packed_update_used_idx(vdev, n); | |
3480 | } else { | |
3481 | return virtio_split_packed_update_used_idx(vdev, n); | |
3482 | } | |
3483 | } | |
3484 | ||
6793dfd1 SH |
3485 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) |
3486 | { | |
3487 | vdev->vq[n].signalled_used_valid = false; | |
3488 | } | |
3489 | ||
1cbdabe2 MT |
3490 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) |
3491 | { | |
3492 | return vdev->vq + n; | |
3493 | } | |
3494 | ||
e78a2b42 JW |
3495 | uint16_t virtio_get_queue_index(VirtQueue *vq) |
3496 | { | |
3497 | return vq->queue_index; | |
3498 | } | |
3499 | ||
15b2bd18 PB |
3500 | static void virtio_queue_guest_notifier_read(EventNotifier *n) |
3501 | { | |
3502 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); | |
3503 | if (event_notifier_test_and_clear(n)) { | |
b4b9862b | 3504 | virtio_irq(vq); |
15b2bd18 PB |
3505 | } |
3506 | } | |
3507 | ||
3508 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, | |
3509 | bool with_irqfd) | |
3510 | { | |
3511 | if (assign && !with_irqfd) { | |
d6da1e9e | 3512 | event_notifier_set_handler(&vq->guest_notifier, |
15b2bd18 PB |
3513 | virtio_queue_guest_notifier_read); |
3514 | } else { | |
d6da1e9e | 3515 | event_notifier_set_handler(&vq->guest_notifier, NULL); |
15b2bd18 PB |
3516 | } |
3517 | if (!assign) { | |
3518 | /* Test and clear notifier before closing it, | |
3519 | * in case poll callback didn't have time to run. */ | |
3520 | virtio_queue_guest_notifier_read(&vq->guest_notifier); | |
3521 | } | |
3522 | } | |
3523 | ||
1cbdabe2 MT |
3524 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
3525 | { | |
3526 | return &vq->guest_notifier; | |
3527 | } | |
b1f416aa | 3528 | |
344dc16f | 3529 | static void virtio_queue_host_notifier_aio_read(EventNotifier *n) |
b1f416aa PB |
3530 | { |
3531 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3532 | if (event_notifier_test_and_clear(n)) { | |
344dc16f | 3533 | virtio_queue_notify_aio_vq(vq); |
b1f416aa PB |
3534 | } |
3535 | } | |
3536 | ||
a7c8215e SH |
3537 | static void virtio_queue_host_notifier_aio_poll_begin(EventNotifier *n) |
3538 | { | |
3539 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3540 | ||
3541 | virtio_queue_set_notification(vq, 0); | |
3542 | } | |
3543 | ||
0062ea0f SH |
3544 | static bool virtio_queue_host_notifier_aio_poll(void *opaque) |
3545 | { | |
3546 | EventNotifier *n = opaque; | |
3547 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3548 | ||
dd3dd4ba | 3549 | if (!vq->vring.desc || virtio_queue_empty(vq)) { |
0062ea0f SH |
3550 | return false; |
3551 | } | |
3552 | ||
d0435bc5 | 3553 | return virtio_queue_notify_aio_vq(vq); |
0062ea0f SH |
3554 | } |
3555 | ||
a7c8215e SH |
3556 | static void virtio_queue_host_notifier_aio_poll_end(EventNotifier *n) |
3557 | { | |
3558 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3559 | ||
3560 | /* Caller polls once more after this to catch requests that race with us */ | |
3561 | virtio_queue_set_notification(vq, 1); | |
3562 | } | |
3563 | ||
a1afb606 | 3564 | void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, |
07931698 | 3565 | VirtIOHandleAIOOutput handle_output) |
a1afb606 | 3566 | { |
a378b49a PB |
3567 | if (handle_output) { |
3568 | vq->handle_aio_output = handle_output; | |
a1afb606 | 3569 | aio_set_event_notifier(ctx, &vq->host_notifier, true, |
0062ea0f SH |
3570 | virtio_queue_host_notifier_aio_read, |
3571 | virtio_queue_host_notifier_aio_poll); | |
a7c8215e SH |
3572 | aio_set_event_notifier_poll(ctx, &vq->host_notifier, |
3573 | virtio_queue_host_notifier_aio_poll_begin, | |
3574 | virtio_queue_host_notifier_aio_poll_end); | |
a1afb606 | 3575 | } else { |
f6a51c84 | 3576 | aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL, NULL); |
a1afb606 PB |
3577 | /* Test and clear notifier before after disabling event, |
3578 | * in case poll callback didn't have time to run. */ | |
344dc16f | 3579 | virtio_queue_host_notifier_aio_read(&vq->host_notifier); |
a378b49a | 3580 | vq->handle_aio_output = NULL; |
344dc16f MT |
3581 | } |
3582 | } | |
3583 | ||
fa283a4a | 3584 | void virtio_queue_host_notifier_read(EventNotifier *n) |
344dc16f MT |
3585 | { |
3586 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3587 | if (event_notifier_test_and_clear(n)) { | |
3588 | virtio_queue_notify_vq(vq); | |
a1afb606 PB |
3589 | } |
3590 | } | |
3591 | ||
1cbdabe2 MT |
3592 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
3593 | { | |
3594 | return &vq->host_notifier; | |
3595 | } | |
8e05db92 | 3596 | |
fcccb271 SH |
3597 | void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled) |
3598 | { | |
3599 | vq->host_notifier_enabled = enabled; | |
3600 | } | |
3601 | ||
6f80e617 TB |
3602 | int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n, |
3603 | MemoryRegion *mr, bool assign) | |
3604 | { | |
3605 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3606 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
3607 | ||
3608 | if (k->set_host_notifier_mr) { | |
3609 | return k->set_host_notifier_mr(qbus->parent, n, mr, assign); | |
3610 | } | |
3611 | ||
3612 | return -1; | |
3613 | } | |
3614 | ||
1034e9cf FK |
3615 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) |
3616 | { | |
9e288406 | 3617 | g_free(vdev->bus_name); |
80e0090a | 3618 | vdev->bus_name = g_strdup(bus_name); |
1034e9cf FK |
3619 | } |
3620 | ||
f5ed3663 SH |
3621 | void GCC_FMT_ATTR(2, 3) virtio_error(VirtIODevice *vdev, const char *fmt, ...) |
3622 | { | |
3623 | va_list ap; | |
3624 | ||
3625 | va_start(ap, fmt); | |
3626 | error_vreport(fmt, ap); | |
3627 | va_end(ap); | |
3628 | ||
f5ed3663 | 3629 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
8fc47c87 | 3630 | vdev->status = vdev->status | VIRTIO_CONFIG_S_NEEDS_RESET; |
f5ed3663 SH |
3631 | virtio_notify_config(vdev); |
3632 | } | |
66453cff GK |
3633 | |
3634 | vdev->broken = true; | |
f5ed3663 SH |
3635 | } |
3636 | ||
c611c764 PB |
3637 | static void virtio_memory_listener_commit(MemoryListener *listener) |
3638 | { | |
3639 | VirtIODevice *vdev = container_of(listener, VirtIODevice, listener); | |
3640 | int i; | |
3641 | ||
3642 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
3643 | if (vdev->vq[i].vring.num == 0) { | |
3644 | break; | |
3645 | } | |
3646 | virtio_init_region_cache(vdev, i); | |
3647 | } | |
3648 | } | |
3649 | ||
1d244b42 AF |
3650 | static void virtio_device_realize(DeviceState *dev, Error **errp) |
3651 | { | |
3652 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
3653 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
3654 | Error *err = NULL; | |
3655 | ||
ea43e259 DDAG |
3656 | /* Devices should either use vmsd or the load/save methods */ |
3657 | assert(!vdc->vmsd || !vdc->load); | |
3658 | ||
1d244b42 AF |
3659 | if (vdc->realize != NULL) { |
3660 | vdc->realize(dev, &err); | |
3661 | if (err != NULL) { | |
3662 | error_propagate(errp, err); | |
3663 | return; | |
3664 | } | |
8e05db92 | 3665 | } |
e8398045 JW |
3666 | |
3667 | virtio_bus_device_plugged(vdev, &err); | |
3668 | if (err != NULL) { | |
3669 | error_propagate(errp, err); | |
b69c3c21 | 3670 | vdc->unrealize(dev); |
e8398045 JW |
3671 | return; |
3672 | } | |
c611c764 PB |
3673 | |
3674 | vdev->listener.commit = virtio_memory_listener_commit; | |
3675 | memory_listener_register(&vdev->listener, vdev->dma_as); | |
8e05db92 FK |
3676 | } |
3677 | ||
b69c3c21 | 3678 | static void virtio_device_unrealize(DeviceState *dev) |
1034e9cf | 3679 | { |
1d244b42 | 3680 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
306ec6c3 | 3681 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
1d244b42 | 3682 | |
f6ab64c0 | 3683 | memory_listener_unregister(&vdev->listener); |
83d07047 PB |
3684 | virtio_bus_device_unplugged(vdev); |
3685 | ||
306ec6c3 | 3686 | if (vdc->unrealize != NULL) { |
b69c3c21 | 3687 | vdc->unrealize(dev); |
5e96f5d2 | 3688 | } |
1d244b42 | 3689 | |
9e288406 MA |
3690 | g_free(vdev->bus_name); |
3691 | vdev->bus_name = NULL; | |
1034e9cf FK |
3692 | } |
3693 | ||
c611c764 PB |
3694 | static void virtio_device_free_virtqueues(VirtIODevice *vdev) |
3695 | { | |
3696 | int i; | |
3697 | if (!vdev->vq) { | |
3698 | return; | |
3699 | } | |
3700 | ||
3701 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
c611c764 PB |
3702 | if (vdev->vq[i].vring.num == 0) { |
3703 | break; | |
3704 | } | |
e0e2d644 | 3705 | virtio_virtqueue_reset_region_cache(&vdev->vq[i]); |
c611c764 PB |
3706 | } |
3707 | g_free(vdev->vq); | |
3708 | } | |
3709 | ||
3710 | static void virtio_device_instance_finalize(Object *obj) | |
3711 | { | |
3712 | VirtIODevice *vdev = VIRTIO_DEVICE(obj); | |
3713 | ||
c611c764 PB |
3714 | virtio_device_free_virtqueues(vdev); |
3715 | ||
3716 | g_free(vdev->config); | |
3717 | g_free(vdev->vector_queues); | |
3718 | } | |
3719 | ||
6b8f1020 CH |
3720 | static Property virtio_properties[] = { |
3721 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), | |
e57f2c31 | 3722 | DEFINE_PROP_BOOL("use-started", VirtIODevice, use_started, true), |
9d7bd082 | 3723 | DEFINE_PROP_BOOL("use-disabled-flag", VirtIODevice, use_disabled_flag, true), |
d55f5182 SG |
3724 | DEFINE_PROP_BOOL("x-disable-legacy-check", VirtIODevice, |
3725 | disable_legacy_check, false), | |
6b8f1020 CH |
3726 | DEFINE_PROP_END_OF_LIST(), |
3727 | }; | |
3728 | ||
ff4c07df PB |
3729 | static int virtio_device_start_ioeventfd_impl(VirtIODevice *vdev) |
3730 | { | |
3731 | VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); | |
710fccf8 | 3732 | int i, n, r, err; |
ff4c07df | 3733 | |
710fccf8 | 3734 | memory_region_transaction_begin(); |
ff4c07df | 3735 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
fa283a4a | 3736 | VirtQueue *vq = &vdev->vq[n]; |
ff4c07df PB |
3737 | if (!virtio_queue_get_num(vdev, n)) { |
3738 | continue; | |
3739 | } | |
ed08a2a0 | 3740 | r = virtio_bus_set_host_notifier(qbus, n, true); |
ff4c07df PB |
3741 | if (r < 0) { |
3742 | err = r; | |
3743 | goto assign_error; | |
3744 | } | |
d6da1e9e | 3745 | event_notifier_set_handler(&vq->host_notifier, |
fa283a4a | 3746 | virtio_queue_host_notifier_read); |
6019f3b9 PB |
3747 | } |
3748 | ||
3749 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { | |
3750 | /* Kick right away to begin processing requests already in vring */ | |
3751 | VirtQueue *vq = &vdev->vq[n]; | |
3752 | if (!vq->vring.num) { | |
3753 | continue; | |
3754 | } | |
3755 | event_notifier_set(&vq->host_notifier); | |
ff4c07df | 3756 | } |
710fccf8 | 3757 | memory_region_transaction_commit(); |
ff4c07df PB |
3758 | return 0; |
3759 | ||
3760 | assign_error: | |
710fccf8 | 3761 | i = n; /* save n for a second iteration after transaction is committed. */ |
ff4c07df | 3762 | while (--n >= 0) { |
fa283a4a | 3763 | VirtQueue *vq = &vdev->vq[n]; |
ff4c07df PB |
3764 | if (!virtio_queue_get_num(vdev, n)) { |
3765 | continue; | |
3766 | } | |
3767 | ||
d6da1e9e | 3768 | event_notifier_set_handler(&vq->host_notifier, NULL); |
ed08a2a0 | 3769 | r = virtio_bus_set_host_notifier(qbus, n, false); |
ff4c07df | 3770 | assert(r >= 0); |
710fccf8 GH |
3771 | } |
3772 | memory_region_transaction_commit(); | |
3773 | ||
3774 | while (--i >= 0) { | |
3775 | if (!virtio_queue_get_num(vdev, i)) { | |
3776 | continue; | |
3777 | } | |
3778 | virtio_bus_cleanup_host_notifier(qbus, i); | |
ff4c07df PB |
3779 | } |
3780 | return err; | |
3781 | } | |
3782 | ||
3783 | int virtio_device_start_ioeventfd(VirtIODevice *vdev) | |
3784 | { | |
3785 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3786 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3787 | ||
3788 | return virtio_bus_start_ioeventfd(vbus); | |
3789 | } | |
3790 | ||
3791 | static void virtio_device_stop_ioeventfd_impl(VirtIODevice *vdev) | |
3792 | { | |
3793 | VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); | |
ff4c07df PB |
3794 | int n, r; |
3795 | ||
710fccf8 | 3796 | memory_region_transaction_begin(); |
ff4c07df | 3797 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
fa283a4a PB |
3798 | VirtQueue *vq = &vdev->vq[n]; |
3799 | ||
ff4c07df PB |
3800 | if (!virtio_queue_get_num(vdev, n)) { |
3801 | continue; | |
3802 | } | |
d6da1e9e | 3803 | event_notifier_set_handler(&vq->host_notifier, NULL); |
ed08a2a0 | 3804 | r = virtio_bus_set_host_notifier(qbus, n, false); |
ff4c07df | 3805 | assert(r >= 0); |
710fccf8 GH |
3806 | } |
3807 | memory_region_transaction_commit(); | |
3808 | ||
3809 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { | |
3810 | if (!virtio_queue_get_num(vdev, n)) { | |
3811 | continue; | |
3812 | } | |
76143618 | 3813 | virtio_bus_cleanup_host_notifier(qbus, n); |
ff4c07df PB |
3814 | } |
3815 | } | |
3816 | ||
310837de PB |
3817 | int virtio_device_grab_ioeventfd(VirtIODevice *vdev) |
3818 | { | |
3819 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3820 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3821 | ||
3822 | return virtio_bus_grab_ioeventfd(vbus); | |
3823 | } | |
3824 | ||
3825 | void virtio_device_release_ioeventfd(VirtIODevice *vdev) | |
3826 | { | |
3827 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3828 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3829 | ||
3830 | virtio_bus_release_ioeventfd(vbus); | |
3831 | } | |
3832 | ||
8e05db92 FK |
3833 | static void virtio_device_class_init(ObjectClass *klass, void *data) |
3834 | { | |
3835 | /* Set the default value here. */ | |
ff4c07df | 3836 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
8e05db92 | 3837 | DeviceClass *dc = DEVICE_CLASS(klass); |
1d244b42 AF |
3838 | |
3839 | dc->realize = virtio_device_realize; | |
3840 | dc->unrealize = virtio_device_unrealize; | |
8e05db92 | 3841 | dc->bus_type = TYPE_VIRTIO_BUS; |
4f67d30b | 3842 | device_class_set_props(dc, virtio_properties); |
ff4c07df PB |
3843 | vdc->start_ioeventfd = virtio_device_start_ioeventfd_impl; |
3844 | vdc->stop_ioeventfd = virtio_device_stop_ioeventfd_impl; | |
9b706dbb MT |
3845 | |
3846 | vdc->legacy_features |= VIRTIO_LEGACY_FEATURES; | |
8e05db92 FK |
3847 | } |
3848 | ||
8e93cef1 PB |
3849 | bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev) |
3850 | { | |
3851 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3852 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3853 | ||
3854 | return virtio_bus_ioeventfd_enabled(vbus); | |
3855 | } | |
3856 | ||
8e05db92 FK |
3857 | static const TypeInfo virtio_device_info = { |
3858 | .name = TYPE_VIRTIO_DEVICE, | |
3859 | .parent = TYPE_DEVICE, | |
3860 | .instance_size = sizeof(VirtIODevice), | |
3861 | .class_init = virtio_device_class_init, | |
c611c764 | 3862 | .instance_finalize = virtio_device_instance_finalize, |
8e05db92 FK |
3863 | .abstract = true, |
3864 | .class_size = sizeof(VirtioDeviceClass), | |
3865 | }; | |
3866 | ||
3867 | static void virtio_register_types(void) | |
3868 | { | |
3869 | type_register_static(&virtio_device_info); | |
3870 | } | |
3871 | ||
3872 | type_init(virtio_register_types) |