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Commit | Line | Data |
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967f97fa AL |
1 | /* |
2 | * Virtio Support | |
3 | * | |
4 | * Copyright IBM, Corp. 2007 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
9b8bfe21 | 14 | #include "qemu/osdep.h" |
da34e65c | 15 | #include "qapi/error.h" |
4771d756 | 16 | #include "cpu.h" |
64979a4d | 17 | #include "trace.h" |
1de7afc9 | 18 | #include "qemu/error-report.h" |
d68cdae3 | 19 | #include "qemu/log.h" |
db725815 | 20 | #include "qemu/main-loop.h" |
0b8fa32f | 21 | #include "qemu/module.h" |
0d09e41a | 22 | #include "hw/virtio/virtio.h" |
ca77ee28 | 23 | #include "migration/qemu-file-types.h" |
1de7afc9 | 24 | #include "qemu/atomic.h" |
0d09e41a | 25 | #include "hw/virtio/virtio-bus.h" |
a27bd6c7 | 26 | #include "hw/qdev-properties.h" |
cee3ca00 | 27 | #include "hw/virtio/virtio-access.h" |
8607f5c3 | 28 | #include "sysemu/dma.h" |
54d31236 | 29 | #include "sysemu/runstate.h" |
7c78bdd7 | 30 | #include "standard-headers/linux/virtio_ids.h" |
967f97fa | 31 | |
6ce69d1c PM |
32 | /* |
33 | * The alignment to use between consumer and producer parts of vring. | |
34 | * x86 pagesize again. This is the default, used by transports like PCI | |
35 | * which don't provide a means for the guest to tell the host the alignment. | |
36 | */ | |
f46f15bc AL |
37 | #define VIRTIO_PCI_VRING_ALIGN 4096 |
38 | ||
967f97fa AL |
39 | typedef struct VRingDesc |
40 | { | |
41 | uint64_t addr; | |
42 | uint32_t len; | |
43 | uint16_t flags; | |
44 | uint16_t next; | |
45 | } VRingDesc; | |
46 | ||
a40dcec9 WX |
47 | typedef struct VRingPackedDesc { |
48 | uint64_t addr; | |
49 | uint32_t len; | |
50 | uint16_t id; | |
51 | uint16_t flags; | |
52 | } VRingPackedDesc; | |
53 | ||
967f97fa AL |
54 | typedef struct VRingAvail |
55 | { | |
56 | uint16_t flags; | |
57 | uint16_t idx; | |
f7795e40 | 58 | uint16_t ring[]; |
967f97fa AL |
59 | } VRingAvail; |
60 | ||
61 | typedef struct VRingUsedElem | |
62 | { | |
63 | uint32_t id; | |
64 | uint32_t len; | |
65 | } VRingUsedElem; | |
66 | ||
67 | typedef struct VRingUsed | |
68 | { | |
69 | uint16_t flags; | |
70 | uint16_t idx; | |
f7795e40 | 71 | VRingUsedElem ring[]; |
967f97fa AL |
72 | } VRingUsed; |
73 | ||
c611c764 PB |
74 | typedef struct VRingMemoryRegionCaches { |
75 | struct rcu_head rcu; | |
76 | MemoryRegionCache desc; | |
77 | MemoryRegionCache avail; | |
78 | MemoryRegionCache used; | |
79 | } VRingMemoryRegionCaches; | |
80 | ||
967f97fa AL |
81 | typedef struct VRing |
82 | { | |
83 | unsigned int num; | |
46c5d082 | 84 | unsigned int num_default; |
6ce69d1c | 85 | unsigned int align; |
a8170e5e AK |
86 | hwaddr desc; |
87 | hwaddr avail; | |
88 | hwaddr used; | |
c611c764 | 89 | VRingMemoryRegionCaches *caches; |
967f97fa AL |
90 | } VRing; |
91 | ||
a40dcec9 WX |
92 | typedef struct VRingPackedDescEvent { |
93 | uint16_t off_wrap; | |
94 | uint16_t flags; | |
95 | } VRingPackedDescEvent ; | |
96 | ||
967f97fa AL |
97 | struct VirtQueue |
98 | { | |
99 | VRing vring; | |
86044b24 | 100 | VirtQueueElement *used_elems; |
be1fea9b VM |
101 | |
102 | /* Next head to pop */ | |
967f97fa | 103 | uint16_t last_avail_idx; |
a40dcec9 | 104 | bool last_avail_wrap_counter; |
b796fcd1 | 105 | |
be1fea9b VM |
106 | /* Last avail_idx read from VQ. */ |
107 | uint16_t shadow_avail_idx; | |
a40dcec9 | 108 | bool shadow_avail_wrap_counter; |
be1fea9b | 109 | |
b796fcd1 | 110 | uint16_t used_idx; |
a40dcec9 | 111 | bool used_wrap_counter; |
b796fcd1 | 112 | |
bcbabae8 MT |
113 | /* Last used index value we have signalled on */ |
114 | uint16_t signalled_used; | |
115 | ||
116 | /* Last used index value we have signalled on */ | |
117 | bool signalled_used_valid; | |
118 | ||
332fa82d SH |
119 | /* Notification enabled? */ |
120 | bool notification; | |
bcbabae8 | 121 | |
e78a2b42 JW |
122 | uint16_t queue_index; |
123 | ||
e66bcc40 | 124 | unsigned int inuse; |
bcbabae8 | 125 | |
7055e687 | 126 | uint16_t vector; |
bf1780b0 | 127 | VirtIOHandleOutput handle_output; |
07931698 | 128 | VirtIOHandleAIOOutput handle_aio_output; |
1cbdabe2 MT |
129 | VirtIODevice *vdev; |
130 | EventNotifier guest_notifier; | |
131 | EventNotifier host_notifier; | |
fcccb271 | 132 | bool host_notifier_enabled; |
e0d686bf | 133 | QLIST_ENTRY(VirtQueue) node; |
967f97fa AL |
134 | }; |
135 | ||
b116d6c3 | 136 | /* Called within call_rcu(). */ |
c611c764 PB |
137 | static void virtio_free_region_cache(VRingMemoryRegionCaches *caches) |
138 | { | |
b116d6c3 | 139 | assert(caches != NULL); |
c611c764 PB |
140 | address_space_cache_destroy(&caches->desc); |
141 | address_space_cache_destroy(&caches->avail); | |
142 | address_space_cache_destroy(&caches->used); | |
143 | g_free(caches); | |
144 | } | |
145 | ||
45641dba PB |
146 | static void virtio_virtqueue_reset_region_cache(struct VirtQueue *vq) |
147 | { | |
148 | VRingMemoryRegionCaches *caches; | |
149 | ||
d73415a3 SH |
150 | caches = qatomic_read(&vq->vring.caches); |
151 | qatomic_rcu_set(&vq->vring.caches, NULL); | |
45641dba PB |
152 | if (caches) { |
153 | call_rcu(caches, virtio_free_region_cache, rcu); | |
154 | } | |
155 | } | |
156 | ||
c611c764 PB |
157 | static void virtio_init_region_cache(VirtIODevice *vdev, int n) |
158 | { | |
159 | VirtQueue *vq = &vdev->vq[n]; | |
160 | VRingMemoryRegionCaches *old = vq->vring.caches; | |
45641dba | 161 | VRingMemoryRegionCaches *new = NULL; |
c611c764 | 162 | hwaddr addr, size; |
e45da653 | 163 | int64_t len; |
86044b24 | 164 | bool packed; |
c611c764 | 165 | |
c611c764 PB |
166 | |
167 | addr = vq->vring.desc; | |
168 | if (!addr) { | |
45641dba | 169 | goto out_no_cache; |
c611c764 PB |
170 | } |
171 | new = g_new0(VRingMemoryRegionCaches, 1); | |
172 | size = virtio_queue_get_desc_size(vdev, n); | |
86044b24 JW |
173 | packed = virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED) ? |
174 | true : false; | |
e45da653 | 175 | len = address_space_cache_init(&new->desc, vdev->dma_as, |
86044b24 | 176 | addr, size, packed); |
e45da653 JW |
177 | if (len < size) { |
178 | virtio_error(vdev, "Cannot map desc"); | |
179 | goto err_desc; | |
180 | } | |
c611c764 | 181 | |
f90cda63 | 182 | size = virtio_queue_get_used_size(vdev, n); |
e45da653 JW |
183 | len = address_space_cache_init(&new->used, vdev->dma_as, |
184 | vq->vring.used, size, true); | |
185 | if (len < size) { | |
186 | virtio_error(vdev, "Cannot map used"); | |
187 | goto err_used; | |
188 | } | |
c611c764 | 189 | |
f90cda63 | 190 | size = virtio_queue_get_avail_size(vdev, n); |
e45da653 JW |
191 | len = address_space_cache_init(&new->avail, vdev->dma_as, |
192 | vq->vring.avail, size, false); | |
193 | if (len < size) { | |
194 | virtio_error(vdev, "Cannot map avail"); | |
195 | goto err_avail; | |
196 | } | |
c611c764 | 197 | |
d73415a3 | 198 | qatomic_rcu_set(&vq->vring.caches, new); |
c611c764 PB |
199 | if (old) { |
200 | call_rcu(old, virtio_free_region_cache, rcu); | |
201 | } | |
e45da653 JW |
202 | return; |
203 | ||
204 | err_avail: | |
45641dba | 205 | address_space_cache_destroy(&new->avail); |
e45da653 | 206 | err_used: |
45641dba | 207 | address_space_cache_destroy(&new->used); |
e45da653 | 208 | err_desc: |
45641dba PB |
209 | address_space_cache_destroy(&new->desc); |
210 | out_no_cache: | |
e45da653 | 211 | g_free(new); |
45641dba | 212 | virtio_virtqueue_reset_region_cache(vq); |
c611c764 PB |
213 | } |
214 | ||
967f97fa | 215 | /* virt queue functions */ |
ab223c95 | 216 | void virtio_queue_update_rings(VirtIODevice *vdev, int n) |
967f97fa | 217 | { |
ab223c95 | 218 | VRing *vring = &vdev->vq[n].vring; |
53c25cea | 219 | |
758ead31 | 220 | if (!vring->num || !vring->desc || !vring->align) { |
ab223c95 CH |
221 | /* not yet setup -> nothing to do */ |
222 | return; | |
223 | } | |
224 | vring->avail = vring->desc + vring->num * sizeof(VRingDesc); | |
225 | vring->used = vring_align(vring->avail + | |
226 | offsetof(VRingAvail, ring[vring->num]), | |
227 | vring->align); | |
c611c764 | 228 | virtio_init_region_cache(vdev, n); |
967f97fa AL |
229 | } |
230 | ||
97cd965c | 231 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
232 | static void vring_split_desc_read(VirtIODevice *vdev, VRingDesc *desc, |
233 | MemoryRegionCache *cache, int i) | |
967f97fa | 234 | { |
5eba0404 PB |
235 | address_space_read_cached(cache, i * sizeof(VRingDesc), |
236 | desc, sizeof(VRingDesc)); | |
aa570d6f PB |
237 | virtio_tswap64s(vdev, &desc->addr); |
238 | virtio_tswap32s(vdev, &desc->len); | |
239 | virtio_tswap16s(vdev, &desc->flags); | |
240 | virtio_tswap16s(vdev, &desc->next); | |
967f97fa AL |
241 | } |
242 | ||
683f7665 JW |
243 | static void vring_packed_event_read(VirtIODevice *vdev, |
244 | MemoryRegionCache *cache, | |
245 | VRingPackedDescEvent *e) | |
246 | { | |
247 | hwaddr off_off = offsetof(VRingPackedDescEvent, off_wrap); | |
248 | hwaddr off_flags = offsetof(VRingPackedDescEvent, flags); | |
249 | ||
250 | address_space_read_cached(cache, off_flags, &e->flags, | |
251 | sizeof(e->flags)); | |
252 | /* Make sure flags is seen before off_wrap */ | |
253 | smp_rmb(); | |
254 | address_space_read_cached(cache, off_off, &e->off_wrap, | |
255 | sizeof(e->off_wrap)); | |
256 | virtio_tswap16s(vdev, &e->off_wrap); | |
257 | virtio_tswap16s(vdev, &e->flags); | |
258 | } | |
259 | ||
260 | static void vring_packed_off_wrap_write(VirtIODevice *vdev, | |
261 | MemoryRegionCache *cache, | |
262 | uint16_t off_wrap) | |
263 | { | |
264 | hwaddr off = offsetof(VRingPackedDescEvent, off_wrap); | |
265 | ||
266 | virtio_tswap16s(vdev, &off_wrap); | |
267 | address_space_write_cached(cache, off, &off_wrap, sizeof(off_wrap)); | |
268 | address_space_cache_invalidate(cache, off, sizeof(off_wrap)); | |
269 | } | |
270 | ||
271 | static void vring_packed_flags_write(VirtIODevice *vdev, | |
272 | MemoryRegionCache *cache, uint16_t flags) | |
273 | { | |
274 | hwaddr off = offsetof(VRingPackedDescEvent, flags); | |
275 | ||
276 | virtio_tswap16s(vdev, &flags); | |
277 | address_space_write_cached(cache, off, &flags, sizeof(flags)); | |
278 | address_space_cache_invalidate(cache, off, sizeof(flags)); | |
279 | } | |
280 | ||
86044b24 | 281 | /* Called within rcu_read_lock(). */ |
e0e2d644 JW |
282 | static VRingMemoryRegionCaches *vring_get_region_caches(struct VirtQueue *vq) |
283 | { | |
d73415a3 | 284 | return qatomic_rcu_read(&vq->vring.caches); |
e0e2d644 | 285 | } |
abdd16f4 | 286 | |
97cd965c | 287 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
288 | static inline uint16_t vring_avail_flags(VirtQueue *vq) |
289 | { | |
e0e2d644 | 290 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 291 | hwaddr pa = offsetof(VRingAvail, flags); |
abdd16f4 SH |
292 | |
293 | if (!caches) { | |
294 | return 0; | |
295 | } | |
296 | ||
97cd965c | 297 | return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
967f97fa AL |
298 | } |
299 | ||
97cd965c | 300 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
301 | static inline uint16_t vring_avail_idx(VirtQueue *vq) |
302 | { | |
e0e2d644 | 303 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 304 | hwaddr pa = offsetof(VRingAvail, idx); |
abdd16f4 SH |
305 | |
306 | if (!caches) { | |
307 | return 0; | |
308 | } | |
309 | ||
97cd965c | 310 | vq->shadow_avail_idx = virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
be1fea9b | 311 | return vq->shadow_avail_idx; |
967f97fa AL |
312 | } |
313 | ||
97cd965c | 314 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
315 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
316 | { | |
e0e2d644 | 317 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 318 | hwaddr pa = offsetof(VRingAvail, ring[i]); |
abdd16f4 SH |
319 | |
320 | if (!caches) { | |
321 | return 0; | |
322 | } | |
323 | ||
97cd965c | 324 | return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
967f97fa AL |
325 | } |
326 | ||
97cd965c | 327 | /* Called within rcu_read_lock(). */ |
e9600c6c | 328 | static inline uint16_t vring_get_used_event(VirtQueue *vq) |
bcbabae8 MT |
329 | { |
330 | return vring_avail_ring(vq, vq->vring.num); | |
331 | } | |
332 | ||
97cd965c | 333 | /* Called within rcu_read_lock(). */ |
1cdd2ee5 VM |
334 | static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem, |
335 | int i) | |
967f97fa | 336 | { |
e0e2d644 | 337 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 338 | hwaddr pa = offsetof(VRingUsed, ring[i]); |
abdd16f4 SH |
339 | |
340 | if (!caches) { | |
341 | return; | |
342 | } | |
343 | ||
1cdd2ee5 VM |
344 | virtio_tswap32s(vq->vdev, &uelem->id); |
345 | virtio_tswap32s(vq->vdev, &uelem->len); | |
97cd965c PB |
346 | address_space_write_cached(&caches->used, pa, uelem, sizeof(VRingUsedElem)); |
347 | address_space_cache_invalidate(&caches->used, pa, sizeof(VRingUsedElem)); | |
967f97fa AL |
348 | } |
349 | ||
97cd965c | 350 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
351 | static uint16_t vring_used_idx(VirtQueue *vq) |
352 | { | |
e0e2d644 | 353 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 354 | hwaddr pa = offsetof(VRingUsed, idx); |
abdd16f4 SH |
355 | |
356 | if (!caches) { | |
357 | return 0; | |
358 | } | |
359 | ||
97cd965c | 360 | return virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); |
967f97fa AL |
361 | } |
362 | ||
97cd965c | 363 | /* Called within rcu_read_lock(). */ |
bcbabae8 | 364 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
967f97fa | 365 | { |
e0e2d644 | 366 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 367 | hwaddr pa = offsetof(VRingUsed, idx); |
abdd16f4 SH |
368 | |
369 | if (caches) { | |
370 | virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); | |
371 | address_space_cache_invalidate(&caches->used, pa, sizeof(val)); | |
372 | } | |
373 | ||
b796fcd1 | 374 | vq->used_idx = val; |
967f97fa AL |
375 | } |
376 | ||
97cd965c | 377 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
378 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
379 | { | |
e0e2d644 | 380 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
cee3ca00 | 381 | VirtIODevice *vdev = vq->vdev; |
97cd965c | 382 | hwaddr pa = offsetof(VRingUsed, flags); |
abdd16f4 | 383 | uint16_t flags; |
97cd965c | 384 | |
abdd16f4 SH |
385 | if (!caches) { |
386 | return; | |
387 | } | |
388 | ||
389 | flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); | |
97cd965c PB |
390 | virtio_stw_phys_cached(vdev, &caches->used, pa, flags | mask); |
391 | address_space_cache_invalidate(&caches->used, pa, sizeof(flags)); | |
967f97fa AL |
392 | } |
393 | ||
97cd965c | 394 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
395 | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
396 | { | |
e0e2d644 | 397 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
cee3ca00 | 398 | VirtIODevice *vdev = vq->vdev; |
97cd965c | 399 | hwaddr pa = offsetof(VRingUsed, flags); |
abdd16f4 | 400 | uint16_t flags; |
97cd965c | 401 | |
abdd16f4 SH |
402 | if (!caches) { |
403 | return; | |
404 | } | |
405 | ||
406 | flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); | |
97cd965c PB |
407 | virtio_stw_phys_cached(vdev, &caches->used, pa, flags & ~mask); |
408 | address_space_cache_invalidate(&caches->used, pa, sizeof(flags)); | |
967f97fa AL |
409 | } |
410 | ||
97cd965c | 411 | /* Called within rcu_read_lock(). */ |
e9600c6c | 412 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) |
bcbabae8 | 413 | { |
97cd965c | 414 | VRingMemoryRegionCaches *caches; |
a8170e5e | 415 | hwaddr pa; |
332fa82d | 416 | if (!vq->notification) { |
bcbabae8 MT |
417 | return; |
418 | } | |
97cd965c | 419 | |
e0e2d644 | 420 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
421 | if (!caches) { |
422 | return; | |
423 | } | |
424 | ||
97cd965c PB |
425 | pa = offsetof(VRingUsed, ring[vq->vring.num]); |
426 | virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); | |
3cdf8473 | 427 | address_space_cache_invalidate(&caches->used, pa, sizeof(val)); |
bcbabae8 MT |
428 | } |
429 | ||
683f7665 | 430 | static void virtio_queue_split_set_notification(VirtQueue *vq, int enable) |
967f97fa | 431 | { |
b5f53d04 DDAG |
432 | RCU_READ_LOCK_GUARD(); |
433 | ||
95129d6f | 434 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 435 | vring_set_avail_event(vq, vring_avail_idx(vq)); |
bcbabae8 | 436 | } else if (enable) { |
967f97fa | 437 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 438 | } else { |
967f97fa | 439 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 440 | } |
92045d80 MT |
441 | if (enable) { |
442 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
443 | smp_mb(); | |
444 | } | |
967f97fa AL |
445 | } |
446 | ||
683f7665 JW |
447 | static void virtio_queue_packed_set_notification(VirtQueue *vq, int enable) |
448 | { | |
449 | uint16_t off_wrap; | |
450 | VRingPackedDescEvent e; | |
451 | VRingMemoryRegionCaches *caches; | |
452 | ||
b5f53d04 | 453 | RCU_READ_LOCK_GUARD(); |
abdd16f4 SH |
454 | caches = vring_get_region_caches(vq); |
455 | if (!caches) { | |
456 | return; | |
457 | } | |
458 | ||
683f7665 JW |
459 | vring_packed_event_read(vq->vdev, &caches->used, &e); |
460 | ||
461 | if (!enable) { | |
462 | e.flags = VRING_PACKED_EVENT_FLAG_DISABLE; | |
463 | } else if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { | |
464 | off_wrap = vq->shadow_avail_idx | vq->shadow_avail_wrap_counter << 15; | |
465 | vring_packed_off_wrap_write(vq->vdev, &caches->used, off_wrap); | |
466 | /* Make sure off_wrap is wrote before flags */ | |
467 | smp_wmb(); | |
468 | e.flags = VRING_PACKED_EVENT_FLAG_DESC; | |
469 | } else { | |
470 | e.flags = VRING_PACKED_EVENT_FLAG_ENABLE; | |
471 | } | |
472 | ||
473 | vring_packed_flags_write(vq->vdev, &caches->used, e.flags); | |
474 | if (enable) { | |
475 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
476 | smp_mb(); | |
477 | } | |
683f7665 JW |
478 | } |
479 | ||
d0435bc5 SH |
480 | bool virtio_queue_get_notification(VirtQueue *vq) |
481 | { | |
482 | return vq->notification; | |
483 | } | |
484 | ||
683f7665 JW |
485 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
486 | { | |
487 | vq->notification = enable; | |
488 | ||
489 | if (!vq->vring.desc) { | |
490 | return; | |
491 | } | |
492 | ||
493 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
494 | virtio_queue_packed_set_notification(vq, enable); | |
495 | } else { | |
496 | virtio_queue_split_set_notification(vq, enable); | |
497 | } | |
498 | } | |
499 | ||
967f97fa AL |
500 | int virtio_queue_ready(VirtQueue *vq) |
501 | { | |
502 | return vq->vring.avail != 0; | |
503 | } | |
504 | ||
86044b24 JW |
505 | static void vring_packed_desc_read_flags(VirtIODevice *vdev, |
506 | uint16_t *flags, | |
507 | MemoryRegionCache *cache, | |
508 | int i) | |
509 | { | |
510 | address_space_read_cached(cache, | |
511 | i * sizeof(VRingPackedDesc) + | |
512 | offsetof(VRingPackedDesc, flags), | |
513 | flags, sizeof(*flags)); | |
514 | virtio_tswap16s(vdev, flags); | |
515 | } | |
516 | ||
517 | static void vring_packed_desc_read(VirtIODevice *vdev, | |
518 | VRingPackedDesc *desc, | |
519 | MemoryRegionCache *cache, | |
520 | int i, bool strict_order) | |
521 | { | |
522 | hwaddr off = i * sizeof(VRingPackedDesc); | |
523 | ||
524 | vring_packed_desc_read_flags(vdev, &desc->flags, cache, i); | |
525 | ||
526 | if (strict_order) { | |
527 | /* Make sure flags is read before the rest fields. */ | |
528 | smp_rmb(); | |
529 | } | |
530 | ||
531 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, addr), | |
532 | &desc->addr, sizeof(desc->addr)); | |
533 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, id), | |
534 | &desc->id, sizeof(desc->id)); | |
535 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, len), | |
536 | &desc->len, sizeof(desc->len)); | |
537 | virtio_tswap64s(vdev, &desc->addr); | |
538 | virtio_tswap16s(vdev, &desc->id); | |
539 | virtio_tswap32s(vdev, &desc->len); | |
540 | } | |
541 | ||
542 | static void vring_packed_desc_write_data(VirtIODevice *vdev, | |
543 | VRingPackedDesc *desc, | |
544 | MemoryRegionCache *cache, | |
545 | int i) | |
546 | { | |
547 | hwaddr off_id = i * sizeof(VRingPackedDesc) + | |
548 | offsetof(VRingPackedDesc, id); | |
549 | hwaddr off_len = i * sizeof(VRingPackedDesc) + | |
550 | offsetof(VRingPackedDesc, len); | |
551 | ||
552 | virtio_tswap32s(vdev, &desc->len); | |
553 | virtio_tswap16s(vdev, &desc->id); | |
554 | address_space_write_cached(cache, off_id, &desc->id, sizeof(desc->id)); | |
555 | address_space_cache_invalidate(cache, off_id, sizeof(desc->id)); | |
556 | address_space_write_cached(cache, off_len, &desc->len, sizeof(desc->len)); | |
557 | address_space_cache_invalidate(cache, off_len, sizeof(desc->len)); | |
558 | } | |
559 | ||
560 | static void vring_packed_desc_write_flags(VirtIODevice *vdev, | |
561 | VRingPackedDesc *desc, | |
562 | MemoryRegionCache *cache, | |
563 | int i) | |
564 | { | |
565 | hwaddr off = i * sizeof(VRingPackedDesc) + offsetof(VRingPackedDesc, flags); | |
566 | ||
567 | virtio_tswap16s(vdev, &desc->flags); | |
568 | address_space_write_cached(cache, off, &desc->flags, sizeof(desc->flags)); | |
569 | address_space_cache_invalidate(cache, off, sizeof(desc->flags)); | |
570 | } | |
571 | ||
572 | static void vring_packed_desc_write(VirtIODevice *vdev, | |
573 | VRingPackedDesc *desc, | |
574 | MemoryRegionCache *cache, | |
575 | int i, bool strict_order) | |
576 | { | |
577 | vring_packed_desc_write_data(vdev, desc, cache, i); | |
578 | if (strict_order) { | |
579 | /* Make sure data is wrote before flags. */ | |
580 | smp_wmb(); | |
581 | } | |
582 | vring_packed_desc_write_flags(vdev, desc, cache, i); | |
583 | } | |
584 | ||
585 | static inline bool is_desc_avail(uint16_t flags, bool wrap_counter) | |
586 | { | |
587 | bool avail, used; | |
588 | ||
589 | avail = !!(flags & (1 << VRING_PACKED_DESC_F_AVAIL)); | |
590 | used = !!(flags & (1 << VRING_PACKED_DESC_F_USED)); | |
591 | return (avail != used) && (avail == wrap_counter); | |
592 | } | |
593 | ||
be1fea9b | 594 | /* Fetch avail_idx from VQ memory only when we really need to know if |
97cd965c PB |
595 | * guest has added some buffers. |
596 | * Called within rcu_read_lock(). */ | |
597 | static int virtio_queue_empty_rcu(VirtQueue *vq) | |
967f97fa | 598 | { |
9d7bd082 | 599 | if (virtio_device_disabled(vq->vdev)) { |
2d1df859 FZ |
600 | return 1; |
601 | } | |
602 | ||
168e4af3 JW |
603 | if (unlikely(!vq->vring.avail)) { |
604 | return 1; | |
605 | } | |
606 | ||
be1fea9b VM |
607 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
608 | return 0; | |
609 | } | |
610 | ||
967f97fa AL |
611 | return vring_avail_idx(vq) == vq->last_avail_idx; |
612 | } | |
613 | ||
86044b24 | 614 | static int virtio_queue_split_empty(VirtQueue *vq) |
97cd965c PB |
615 | { |
616 | bool empty; | |
617 | ||
9d7bd082 | 618 | if (virtio_device_disabled(vq->vdev)) { |
2d1df859 FZ |
619 | return 1; |
620 | } | |
621 | ||
168e4af3 JW |
622 | if (unlikely(!vq->vring.avail)) { |
623 | return 1; | |
624 | } | |
625 | ||
97cd965c PB |
626 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
627 | return 0; | |
628 | } | |
629 | ||
b5f53d04 | 630 | RCU_READ_LOCK_GUARD(); |
97cd965c | 631 | empty = vring_avail_idx(vq) == vq->last_avail_idx; |
97cd965c PB |
632 | return empty; |
633 | } | |
634 | ||
7f51bedd | 635 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
636 | static int virtio_queue_packed_empty_rcu(VirtQueue *vq) |
637 | { | |
638 | struct VRingPackedDesc desc; | |
639 | VRingMemoryRegionCaches *cache; | |
640 | ||
641 | if (unlikely(!vq->vring.desc)) { | |
642 | return 1; | |
643 | } | |
644 | ||
645 | cache = vring_get_region_caches(vq); | |
abdd16f4 SH |
646 | if (!cache) { |
647 | return 1; | |
648 | } | |
649 | ||
86044b24 JW |
650 | vring_packed_desc_read_flags(vq->vdev, &desc.flags, &cache->desc, |
651 | vq->last_avail_idx); | |
652 | ||
653 | return !is_desc_avail(desc.flags, vq->last_avail_wrap_counter); | |
654 | } | |
655 | ||
656 | static int virtio_queue_packed_empty(VirtQueue *vq) | |
657 | { | |
b5f53d04 DDAG |
658 | RCU_READ_LOCK_GUARD(); |
659 | return virtio_queue_packed_empty_rcu(vq); | |
86044b24 JW |
660 | } |
661 | ||
662 | int virtio_queue_empty(VirtQueue *vq) | |
663 | { | |
664 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
665 | return virtio_queue_packed_empty(vq); | |
666 | } else { | |
667 | return virtio_queue_split_empty(vq); | |
668 | } | |
669 | } | |
670 | ||
ce317461 JW |
671 | static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, |
672 | unsigned int len) | |
967f97fa | 673 | { |
8607f5c3 | 674 | AddressSpace *dma_as = vq->vdev->dma_as; |
967f97fa AL |
675 | unsigned int offset; |
676 | int i; | |
677 | ||
967f97fa AL |
678 | offset = 0; |
679 | for (i = 0; i < elem->in_num; i++) { | |
680 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); | |
681 | ||
8607f5c3 JW |
682 | dma_memory_unmap(dma_as, elem->in_sg[i].iov_base, |
683 | elem->in_sg[i].iov_len, | |
684 | DMA_DIRECTION_FROM_DEVICE, size); | |
967f97fa | 685 | |
0cea71a2 | 686 | offset += size; |
967f97fa AL |
687 | } |
688 | ||
26b258e1 | 689 | for (i = 0; i < elem->out_num; i++) |
8607f5c3 JW |
690 | dma_memory_unmap(dma_as, elem->out_sg[i].iov_base, |
691 | elem->out_sg[i].iov_len, | |
692 | DMA_DIRECTION_TO_DEVICE, | |
693 | elem->out_sg[i].iov_len); | |
ce317461 JW |
694 | } |
695 | ||
2640d2a5 SH |
696 | /* virtqueue_detach_element: |
697 | * @vq: The #VirtQueue | |
698 | * @elem: The #VirtQueueElement | |
699 | * @len: number of bytes written | |
700 | * | |
701 | * Detach the element from the virtqueue. This function is suitable for device | |
702 | * reset or other situations where a #VirtQueueElement is simply freed and will | |
703 | * not be pushed or discarded. | |
704 | */ | |
705 | void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem, | |
706 | unsigned int len) | |
707 | { | |
86044b24 | 708 | vq->inuse -= elem->ndescs; |
2640d2a5 SH |
709 | virtqueue_unmap_sg(vq, elem, len); |
710 | } | |
711 | ||
86044b24 JW |
712 | static void virtqueue_split_rewind(VirtQueue *vq, unsigned int num) |
713 | { | |
714 | vq->last_avail_idx -= num; | |
715 | } | |
716 | ||
717 | static void virtqueue_packed_rewind(VirtQueue *vq, unsigned int num) | |
718 | { | |
719 | if (vq->last_avail_idx < num) { | |
720 | vq->last_avail_idx = vq->vring.num + vq->last_avail_idx - num; | |
721 | vq->last_avail_wrap_counter ^= 1; | |
722 | } else { | |
723 | vq->last_avail_idx -= num; | |
724 | } | |
725 | } | |
726 | ||
27e57efe | 727 | /* virtqueue_unpop: |
2640d2a5 SH |
728 | * @vq: The #VirtQueue |
729 | * @elem: The #VirtQueueElement | |
730 | * @len: number of bytes written | |
731 | * | |
732 | * Pretend the most recent element wasn't popped from the virtqueue. The next | |
733 | * call to virtqueue_pop() will refetch the element. | |
734 | */ | |
27e57efe LP |
735 | void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem, |
736 | unsigned int len) | |
29b9f5ef | 737 | { |
86044b24 JW |
738 | |
739 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
740 | virtqueue_packed_rewind(vq, 1); | |
741 | } else { | |
742 | virtqueue_split_rewind(vq, 1); | |
743 | } | |
744 | ||
2640d2a5 | 745 | virtqueue_detach_element(vq, elem, len); |
29b9f5ef JW |
746 | } |
747 | ||
297a75e6 SH |
748 | /* virtqueue_rewind: |
749 | * @vq: The #VirtQueue | |
750 | * @num: Number of elements to push back | |
751 | * | |
752 | * Pretend that elements weren't popped from the virtqueue. The next | |
753 | * virtqueue_pop() will refetch the oldest element. | |
754 | * | |
27e57efe | 755 | * Use virtqueue_unpop() instead if you have a VirtQueueElement. |
297a75e6 SH |
756 | * |
757 | * Returns: true on success, false if @num is greater than the number of in use | |
758 | * elements. | |
759 | */ | |
760 | bool virtqueue_rewind(VirtQueue *vq, unsigned int num) | |
761 | { | |
762 | if (num > vq->inuse) { | |
763 | return false; | |
764 | } | |
86044b24 | 765 | |
297a75e6 | 766 | vq->inuse -= num; |
86044b24 JW |
767 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
768 | virtqueue_packed_rewind(vq, num); | |
769 | } else { | |
770 | virtqueue_split_rewind(vq, num); | |
771 | } | |
297a75e6 SH |
772 | return true; |
773 | } | |
774 | ||
86044b24 | 775 | static void virtqueue_split_fill(VirtQueue *vq, const VirtQueueElement *elem, |
ce317461 JW |
776 | unsigned int len, unsigned int idx) |
777 | { | |
1cdd2ee5 VM |
778 | VRingUsedElem uelem; |
779 | ||
168e4af3 JW |
780 | if (unlikely(!vq->vring.used)) { |
781 | return; | |
782 | } | |
783 | ||
b796fcd1 | 784 | idx = (idx + vq->used_idx) % vq->vring.num; |
967f97fa | 785 | |
1cdd2ee5 VM |
786 | uelem.id = elem->index; |
787 | uelem.len = len; | |
788 | vring_used_write(vq, &uelem, idx); | |
967f97fa AL |
789 | } |
790 | ||
86044b24 JW |
791 | static void virtqueue_packed_fill(VirtQueue *vq, const VirtQueueElement *elem, |
792 | unsigned int len, unsigned int idx) | |
793 | { | |
794 | vq->used_elems[idx].index = elem->index; | |
795 | vq->used_elems[idx].len = len; | |
796 | vq->used_elems[idx].ndescs = elem->ndescs; | |
797 | } | |
798 | ||
799 | static void virtqueue_packed_fill_desc(VirtQueue *vq, | |
800 | const VirtQueueElement *elem, | |
801 | unsigned int idx, | |
802 | bool strict_order) | |
803 | { | |
804 | uint16_t head; | |
805 | VRingMemoryRegionCaches *caches; | |
806 | VRingPackedDesc desc = { | |
807 | .id = elem->index, | |
808 | .len = elem->len, | |
809 | }; | |
810 | bool wrap_counter = vq->used_wrap_counter; | |
811 | ||
812 | if (unlikely(!vq->vring.desc)) { | |
813 | return; | |
814 | } | |
815 | ||
816 | head = vq->used_idx + idx; | |
817 | if (head >= vq->vring.num) { | |
818 | head -= vq->vring.num; | |
819 | wrap_counter ^= 1; | |
820 | } | |
821 | if (wrap_counter) { | |
822 | desc.flags |= (1 << VRING_PACKED_DESC_F_AVAIL); | |
823 | desc.flags |= (1 << VRING_PACKED_DESC_F_USED); | |
824 | } else { | |
825 | desc.flags &= ~(1 << VRING_PACKED_DESC_F_AVAIL); | |
826 | desc.flags &= ~(1 << VRING_PACKED_DESC_F_USED); | |
827 | } | |
828 | ||
829 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
830 | if (!caches) { |
831 | return; | |
832 | } | |
833 | ||
86044b24 JW |
834 | vring_packed_desc_write(vq->vdev, &desc, &caches->desc, head, strict_order); |
835 | } | |
836 | ||
97cd965c | 837 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
838 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
839 | unsigned int len, unsigned int idx) | |
967f97fa | 840 | { |
86044b24 JW |
841 | trace_virtqueue_fill(vq, elem, len, idx); |
842 | ||
843 | virtqueue_unmap_sg(vq, elem, len); | |
f5ed3663 | 844 | |
9d7bd082 | 845 | if (virtio_device_disabled(vq->vdev)) { |
f5ed3663 SH |
846 | return; |
847 | } | |
848 | ||
86044b24 JW |
849 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
850 | virtqueue_packed_fill(vq, elem, len, idx); | |
851 | } else { | |
852 | virtqueue_split_fill(vq, elem, len, idx); | |
853 | } | |
854 | } | |
855 | ||
856 | /* Called within rcu_read_lock(). */ | |
857 | static void virtqueue_split_flush(VirtQueue *vq, unsigned int count) | |
858 | { | |
859 | uint16_t old, new; | |
860 | ||
168e4af3 JW |
861 | if (unlikely(!vq->vring.used)) { |
862 | return; | |
863 | } | |
864 | ||
967f97fa | 865 | /* Make sure buffer is written before we update index. */ |
b90d2f35 | 866 | smp_wmb(); |
64979a4d | 867 | trace_virtqueue_flush(vq, count); |
b796fcd1 | 868 | old = vq->used_idx; |
bcbabae8 MT |
869 | new = old + count; |
870 | vring_used_idx_set(vq, new); | |
967f97fa | 871 | vq->inuse -= count; |
bcbabae8 MT |
872 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) |
873 | vq->signalled_used_valid = false; | |
967f97fa AL |
874 | } |
875 | ||
86044b24 JW |
876 | static void virtqueue_packed_flush(VirtQueue *vq, unsigned int count) |
877 | { | |
878 | unsigned int i, ndescs = 0; | |
879 | ||
880 | if (unlikely(!vq->vring.desc)) { | |
881 | return; | |
882 | } | |
883 | ||
884 | for (i = 1; i < count; i++) { | |
885 | virtqueue_packed_fill_desc(vq, &vq->used_elems[i], i, false); | |
886 | ndescs += vq->used_elems[i].ndescs; | |
887 | } | |
888 | virtqueue_packed_fill_desc(vq, &vq->used_elems[0], 0, true); | |
889 | ndescs += vq->used_elems[0].ndescs; | |
890 | ||
891 | vq->inuse -= ndescs; | |
892 | vq->used_idx += ndescs; | |
893 | if (vq->used_idx >= vq->vring.num) { | |
894 | vq->used_idx -= vq->vring.num; | |
895 | vq->used_wrap_counter ^= 1; | |
896 | } | |
897 | } | |
898 | ||
899 | void virtqueue_flush(VirtQueue *vq, unsigned int count) | |
900 | { | |
9d7bd082 | 901 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
902 | vq->inuse -= count; |
903 | return; | |
904 | } | |
905 | ||
906 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
907 | virtqueue_packed_flush(vq, count); | |
908 | } else { | |
909 | virtqueue_split_flush(vq, count); | |
910 | } | |
911 | } | |
912 | ||
967f97fa AL |
913 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
914 | unsigned int len) | |
915 | { | |
b5f53d04 | 916 | RCU_READ_LOCK_GUARD(); |
967f97fa AL |
917 | virtqueue_fill(vq, elem, len, 0); |
918 | virtqueue_flush(vq, 1); | |
919 | } | |
920 | ||
97cd965c | 921 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
922 | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
923 | { | |
924 | uint16_t num_heads = vring_avail_idx(vq) - idx; | |
925 | ||
926 | /* Check it isn't doing very strange things with descriptor numbers. */ | |
bb6834cf | 927 | if (num_heads > vq->vring.num) { |
4355c1ab | 928 | virtio_error(vq->vdev, "Guest moved used index from %u to %u", |
be1fea9b | 929 | idx, vq->shadow_avail_idx); |
4355c1ab | 930 | return -EINVAL; |
bb6834cf | 931 | } |
a821ce59 MT |
932 | /* On success, callers read a descriptor at vq->last_avail_idx. |
933 | * Make sure descriptor read does not bypass avail index read. */ | |
934 | if (num_heads) { | |
935 | smp_rmb(); | |
936 | } | |
967f97fa AL |
937 | |
938 | return num_heads; | |
939 | } | |
940 | ||
97cd965c | 941 | /* Called within rcu_read_lock(). */ |
fb1131b6 SH |
942 | static bool virtqueue_get_head(VirtQueue *vq, unsigned int idx, |
943 | unsigned int *head) | |
967f97fa | 944 | { |
967f97fa AL |
945 | /* Grab the next descriptor number they're advertising, and increment |
946 | * the index we've seen. */ | |
fb1131b6 | 947 | *head = vring_avail_ring(vq, idx % vq->vring.num); |
967f97fa AL |
948 | |
949 | /* If their number is silly, that's a fatal mistake. */ | |
fb1131b6 SH |
950 | if (*head >= vq->vring.num) { |
951 | virtio_error(vq->vdev, "Guest says index %u is available", *head); | |
952 | return false; | |
bb6834cf | 953 | } |
967f97fa | 954 | |
fb1131b6 | 955 | return true; |
967f97fa AL |
956 | } |
957 | ||
412e0e81 SH |
958 | enum { |
959 | VIRTQUEUE_READ_DESC_ERROR = -1, | |
960 | VIRTQUEUE_READ_DESC_DONE = 0, /* end of chain */ | |
961 | VIRTQUEUE_READ_DESC_MORE = 1, /* more buffers in chain */ | |
962 | }; | |
967f97fa | 963 | |
86044b24 JW |
964 | static int virtqueue_split_read_next_desc(VirtIODevice *vdev, VRingDesc *desc, |
965 | MemoryRegionCache *desc_cache, | |
966 | unsigned int max, unsigned int *next) | |
412e0e81 | 967 | { |
967f97fa | 968 | /* If this descriptor says it doesn't chain, we're done. */ |
aa570d6f | 969 | if (!(desc->flags & VRING_DESC_F_NEXT)) { |
412e0e81 | 970 | return VIRTQUEUE_READ_DESC_DONE; |
cee3ca00 | 971 | } |
967f97fa AL |
972 | |
973 | /* Check they're not leading us off end of descriptors. */ | |
412e0e81 | 974 | *next = desc->next; |
967f97fa | 975 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
b90d2f35 | 976 | smp_wmb(); |
967f97fa | 977 | |
412e0e81 SH |
978 | if (*next >= max) { |
979 | virtio_error(vdev, "Desc next is %u", *next); | |
980 | return VIRTQUEUE_READ_DESC_ERROR; | |
bb6834cf | 981 | } |
967f97fa | 982 | |
86044b24 | 983 | vring_split_desc_read(vdev, desc, desc_cache, *next); |
412e0e81 | 984 | return VIRTQUEUE_READ_DESC_MORE; |
967f97fa AL |
985 | } |
986 | ||
86044b24 JW |
987 | static void virtqueue_split_get_avail_bytes(VirtQueue *vq, |
988 | unsigned int *in_bytes, unsigned int *out_bytes, | |
989 | unsigned max_in_bytes, unsigned max_out_bytes) | |
967f97fa | 990 | { |
9796d0ac PB |
991 | VirtIODevice *vdev = vq->vdev; |
992 | unsigned int max, idx; | |
385ce95d | 993 | unsigned int total_bufs, in_total, out_total; |
991976f7 | 994 | VRingMemoryRegionCaches *caches; |
5eba0404 PB |
995 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
996 | int64_t len = 0; | |
412e0e81 | 997 | int rc; |
967f97fa | 998 | |
b5f53d04 DDAG |
999 | RCU_READ_LOCK_GUARD(); |
1000 | ||
967f97fa | 1001 | idx = vq->last_avail_idx; |
efeea6d0 | 1002 | total_bufs = in_total = out_total = 0; |
9796d0ac PB |
1003 | |
1004 | max = vq->vring.num; | |
e0e2d644 | 1005 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
1006 | if (!caches) { |
1007 | goto err; | |
1008 | } | |
1009 | ||
4355c1ab | 1010 | while ((rc = virtqueue_num_heads(vq, idx)) > 0) { |
991976f7 | 1011 | MemoryRegionCache *desc_cache = &caches->desc; |
9796d0ac | 1012 | unsigned int num_bufs; |
aa570d6f | 1013 | VRingDesc desc; |
b1c7c07f | 1014 | unsigned int i; |
967f97fa | 1015 | |
efeea6d0 | 1016 | num_bufs = total_bufs; |
fb1131b6 SH |
1017 | |
1018 | if (!virtqueue_get_head(vq, idx++, &i)) { | |
1019 | goto err; | |
1020 | } | |
1021 | ||
86044b24 | 1022 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 | 1023 | |
aa570d6f | 1024 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
74231929 | 1025 | if (!desc.len || (desc.len % sizeof(VRingDesc))) { |
d65abf85 SH |
1026 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
1027 | goto err; | |
efeea6d0 MM |
1028 | } |
1029 | ||
1030 | /* If we've got too many, that implies a descriptor loop. */ | |
1031 | if (num_bufs >= max) { | |
d65abf85 SH |
1032 | virtio_error(vdev, "Looped descriptor"); |
1033 | goto err; | |
efeea6d0 MM |
1034 | } |
1035 | ||
1036 | /* loop over the indirect descriptor table */ | |
5eba0404 PB |
1037 | len = address_space_cache_init(&indirect_desc_cache, |
1038 | vdev->dma_as, | |
1039 | desc.addr, desc.len, false); | |
1040 | desc_cache = &indirect_desc_cache; | |
9796d0ac PB |
1041 | if (len < desc.len) { |
1042 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1043 | goto err; | |
1044 | } | |
1045 | ||
aa570d6f | 1046 | max = desc.len / sizeof(VRingDesc); |
1ae2757c | 1047 | num_bufs = i = 0; |
86044b24 | 1048 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 MM |
1049 | } |
1050 | ||
967f97fa AL |
1051 | do { |
1052 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 1053 | if (++num_bufs > max) { |
d65abf85 SH |
1054 | virtio_error(vdev, "Looped descriptor"); |
1055 | goto err; | |
bb6834cf | 1056 | } |
967f97fa | 1057 | |
aa570d6f PB |
1058 | if (desc.flags & VRING_DESC_F_WRITE) { |
1059 | in_total += desc.len; | |
967f97fa | 1060 | } else { |
aa570d6f | 1061 | out_total += desc.len; |
967f97fa | 1062 | } |
e1f7b481 MT |
1063 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
1064 | goto done; | |
1065 | } | |
412e0e81 | 1066 | |
86044b24 | 1067 | rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, max, &i); |
412e0e81 SH |
1068 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
1069 | ||
1070 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { | |
1071 | goto err; | |
1072 | } | |
efeea6d0 | 1073 | |
5eba0404 PB |
1074 | if (desc_cache == &indirect_desc_cache) { |
1075 | address_space_cache_destroy(&indirect_desc_cache); | |
efeea6d0 | 1076 | total_bufs++; |
9796d0ac PB |
1077 | } else { |
1078 | total_bufs = num_bufs; | |
1079 | } | |
967f97fa | 1080 | } |
4355c1ab SH |
1081 | |
1082 | if (rc < 0) { | |
1083 | goto err; | |
1084 | } | |
1085 | ||
e1f7b481 | 1086 | done: |
5eba0404 | 1087 | address_space_cache_destroy(&indirect_desc_cache); |
0d8d7690 | 1088 | if (in_bytes) { |
86044b24 JW |
1089 | *in_bytes = in_total; |
1090 | } | |
1091 | if (out_bytes) { | |
1092 | *out_bytes = out_total; | |
1093 | } | |
86044b24 JW |
1094 | return; |
1095 | ||
1096 | err: | |
1097 | in_total = out_total = 0; | |
1098 | goto done; | |
1099 | } | |
1100 | ||
1101 | static int virtqueue_packed_read_next_desc(VirtQueue *vq, | |
1102 | VRingPackedDesc *desc, | |
1103 | MemoryRegionCache | |
1104 | *desc_cache, | |
1105 | unsigned int max, | |
1106 | unsigned int *next, | |
1107 | bool indirect) | |
1108 | { | |
1109 | /* If this descriptor says it doesn't chain, we're done. */ | |
1110 | if (!indirect && !(desc->flags & VRING_DESC_F_NEXT)) { | |
1111 | return VIRTQUEUE_READ_DESC_DONE; | |
1112 | } | |
1113 | ||
1114 | ++*next; | |
1115 | if (*next == max) { | |
1116 | if (indirect) { | |
1117 | return VIRTQUEUE_READ_DESC_DONE; | |
1118 | } else { | |
1119 | (*next) -= vq->vring.num; | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | vring_packed_desc_read(vq->vdev, desc, desc_cache, *next, false); | |
1124 | return VIRTQUEUE_READ_DESC_MORE; | |
1125 | } | |
1126 | ||
1127 | static void virtqueue_packed_get_avail_bytes(VirtQueue *vq, | |
1128 | unsigned int *in_bytes, | |
1129 | unsigned int *out_bytes, | |
1130 | unsigned max_in_bytes, | |
1131 | unsigned max_out_bytes) | |
1132 | { | |
1133 | VirtIODevice *vdev = vq->vdev; | |
1134 | unsigned int max, idx; | |
1135 | unsigned int total_bufs, in_total, out_total; | |
1136 | MemoryRegionCache *desc_cache; | |
1137 | VRingMemoryRegionCaches *caches; | |
1138 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; | |
1139 | int64_t len = 0; | |
1140 | VRingPackedDesc desc; | |
1141 | bool wrap_counter; | |
1142 | ||
b5f53d04 | 1143 | RCU_READ_LOCK_GUARD(); |
86044b24 JW |
1144 | idx = vq->last_avail_idx; |
1145 | wrap_counter = vq->last_avail_wrap_counter; | |
1146 | total_bufs = in_total = out_total = 0; | |
1147 | ||
1148 | max = vq->vring.num; | |
1149 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
1150 | if (!caches) { |
1151 | goto err; | |
1152 | } | |
86044b24 JW |
1153 | |
1154 | for (;;) { | |
1155 | unsigned int num_bufs = total_bufs; | |
1156 | unsigned int i = idx; | |
1157 | int rc; | |
1158 | ||
1159 | desc_cache = &caches->desc; | |
1160 | vring_packed_desc_read(vdev, &desc, desc_cache, idx, true); | |
1161 | if (!is_desc_avail(desc.flags, wrap_counter)) { | |
1162 | break; | |
1163 | } | |
1164 | ||
1165 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
1166 | if (desc.len % sizeof(VRingPackedDesc)) { | |
1167 | virtio_error(vdev, "Invalid size for indirect buffer table"); | |
1168 | goto err; | |
1169 | } | |
1170 | ||
1171 | /* If we've got too many, that implies a descriptor loop. */ | |
1172 | if (num_bufs >= max) { | |
1173 | virtio_error(vdev, "Looped descriptor"); | |
1174 | goto err; | |
1175 | } | |
1176 | ||
1177 | /* loop over the indirect descriptor table */ | |
1178 | len = address_space_cache_init(&indirect_desc_cache, | |
1179 | vdev->dma_as, | |
1180 | desc.addr, desc.len, false); | |
1181 | desc_cache = &indirect_desc_cache; | |
1182 | if (len < desc.len) { | |
1183 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1184 | goto err; | |
1185 | } | |
1186 | ||
1187 | max = desc.len / sizeof(VRingPackedDesc); | |
1188 | num_bufs = i = 0; | |
1189 | vring_packed_desc_read(vdev, &desc, desc_cache, i, false); | |
1190 | } | |
1191 | ||
1192 | do { | |
1193 | /* If we've got too many, that implies a descriptor loop. */ | |
1194 | if (++num_bufs > max) { | |
1195 | virtio_error(vdev, "Looped descriptor"); | |
1196 | goto err; | |
1197 | } | |
1198 | ||
1199 | if (desc.flags & VRING_DESC_F_WRITE) { | |
1200 | in_total += desc.len; | |
1201 | } else { | |
1202 | out_total += desc.len; | |
1203 | } | |
1204 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { | |
1205 | goto done; | |
1206 | } | |
1207 | ||
1208 | rc = virtqueue_packed_read_next_desc(vq, &desc, desc_cache, max, | |
1209 | &i, desc_cache == | |
1210 | &indirect_desc_cache); | |
1211 | } while (rc == VIRTQUEUE_READ_DESC_MORE); | |
1212 | ||
1213 | if (desc_cache == &indirect_desc_cache) { | |
1214 | address_space_cache_destroy(&indirect_desc_cache); | |
1215 | total_bufs++; | |
1216 | idx++; | |
1217 | } else { | |
1218 | idx += num_bufs - total_bufs; | |
1219 | total_bufs = num_bufs; | |
1220 | } | |
1221 | ||
1222 | if (idx >= vq->vring.num) { | |
1223 | idx -= vq->vring.num; | |
1224 | wrap_counter ^= 1; | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | /* Record the index and wrap counter for a kick we want */ | |
1229 | vq->shadow_avail_idx = idx; | |
1230 | vq->shadow_avail_wrap_counter = wrap_counter; | |
1231 | done: | |
1232 | address_space_cache_destroy(&indirect_desc_cache); | |
1233 | if (in_bytes) { | |
1234 | *in_bytes = in_total; | |
1235 | } | |
1236 | if (out_bytes) { | |
1237 | *out_bytes = out_total; | |
1238 | } | |
86044b24 JW |
1239 | return; |
1240 | ||
1241 | err: | |
1242 | in_total = out_total = 0; | |
1243 | goto done; | |
1244 | } | |
1245 | ||
1246 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, | |
1247 | unsigned int *out_bytes, | |
1248 | unsigned max_in_bytes, unsigned max_out_bytes) | |
1249 | { | |
1250 | uint16_t desc_size; | |
1251 | VRingMemoryRegionCaches *caches; | |
1252 | ||
1253 | if (unlikely(!vq->vring.desc)) { | |
1254 | goto err; | |
1255 | } | |
1256 | ||
1257 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
1258 | if (!caches) { |
1259 | goto err; | |
1260 | } | |
1261 | ||
86044b24 JW |
1262 | desc_size = virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED) ? |
1263 | sizeof(VRingPackedDesc) : sizeof(VRingDesc); | |
1264 | if (caches->desc.len < vq->vring.num * desc_size) { | |
1265 | virtio_error(vq->vdev, "Cannot map descriptor ring"); | |
1266 | goto err; | |
1267 | } | |
1268 | ||
1269 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
1270 | virtqueue_packed_get_avail_bytes(vq, in_bytes, out_bytes, | |
1271 | max_in_bytes, max_out_bytes); | |
1272 | } else { | |
1273 | virtqueue_split_get_avail_bytes(vq, in_bytes, out_bytes, | |
1274 | max_in_bytes, max_out_bytes); | |
1275 | } | |
1276 | ||
1277 | return; | |
1278 | err: | |
1279 | if (in_bytes) { | |
1280 | *in_bytes = 0; | |
0d8d7690 AS |
1281 | } |
1282 | if (out_bytes) { | |
86044b24 | 1283 | *out_bytes = 0; |
0d8d7690 AS |
1284 | } |
1285 | } | |
967f97fa | 1286 | |
0d8d7690 AS |
1287 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
1288 | unsigned int out_bytes) | |
1289 | { | |
1290 | unsigned int in_total, out_total; | |
1291 | ||
e1f7b481 MT |
1292 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); |
1293 | return in_bytes <= in_total && out_bytes <= out_total; | |
967f97fa AL |
1294 | } |
1295 | ||
ec55da19 SH |
1296 | static bool virtqueue_map_desc(VirtIODevice *vdev, unsigned int *p_num_sg, |
1297 | hwaddr *addr, struct iovec *iov, | |
3b3b0628 PB |
1298 | unsigned int max_num_sg, bool is_write, |
1299 | hwaddr pa, size_t sz) | |
1300 | { | |
ec55da19 | 1301 | bool ok = false; |
3b3b0628 PB |
1302 | unsigned num_sg = *p_num_sg; |
1303 | assert(num_sg <= max_num_sg); | |
1304 | ||
1e7aed70 | 1305 | if (!sz) { |
ec55da19 SH |
1306 | virtio_error(vdev, "virtio: zero sized buffers are not allowed"); |
1307 | goto out; | |
1e7aed70 PP |
1308 | } |
1309 | ||
3b3b0628 PB |
1310 | while (sz) { |
1311 | hwaddr len = sz; | |
1312 | ||
1313 | if (num_sg == max_num_sg) { | |
ec55da19 SH |
1314 | virtio_error(vdev, "virtio: too many write descriptors in " |
1315 | "indirect table"); | |
1316 | goto out; | |
3b3b0628 PB |
1317 | } |
1318 | ||
8607f5c3 JW |
1319 | iov[num_sg].iov_base = dma_memory_map(vdev->dma_as, pa, &len, |
1320 | is_write ? | |
1321 | DMA_DIRECTION_FROM_DEVICE : | |
1322 | DMA_DIRECTION_TO_DEVICE); | |
973e7170 | 1323 | if (!iov[num_sg].iov_base) { |
ec55da19 SH |
1324 | virtio_error(vdev, "virtio: bogus descriptor or out of resources"); |
1325 | goto out; | |
973e7170 PP |
1326 | } |
1327 | ||
3b3b0628 PB |
1328 | iov[num_sg].iov_len = len; |
1329 | addr[num_sg] = pa; | |
1330 | ||
1331 | sz -= len; | |
1332 | pa += len; | |
1333 | num_sg++; | |
1334 | } | |
ec55da19 SH |
1335 | ok = true; |
1336 | ||
1337 | out: | |
3b3b0628 | 1338 | *p_num_sg = num_sg; |
ec55da19 SH |
1339 | return ok; |
1340 | } | |
1341 | ||
1342 | /* Only used by error code paths before we have a VirtQueueElement (therefore | |
1343 | * virtqueue_unmap_sg() can't be used). Assumes buffers weren't written to | |
1344 | * yet. | |
1345 | */ | |
1346 | static void virtqueue_undo_map_desc(unsigned int out_num, unsigned int in_num, | |
1347 | struct iovec *iov) | |
1348 | { | |
1349 | unsigned int i; | |
1350 | ||
1351 | for (i = 0; i < out_num + in_num; i++) { | |
1352 | int is_write = i >= out_num; | |
1353 | ||
1354 | cpu_physical_memory_unmap(iov->iov_base, iov->iov_len, is_write, 0); | |
1355 | iov++; | |
1356 | } | |
3b3b0628 PB |
1357 | } |
1358 | ||
8607f5c3 | 1359 | static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg, |
e4fbf5b2 | 1360 | hwaddr *addr, unsigned int num_sg, |
22953364 | 1361 | bool is_write) |
42fb2e07 KW |
1362 | { |
1363 | unsigned int i; | |
a8170e5e | 1364 | hwaddr len; |
42fb2e07 | 1365 | |
e4fbf5b2 | 1366 | for (i = 0; i < num_sg; i++) { |
42fb2e07 | 1367 | len = sg[i].iov_len; |
8607f5c3 JW |
1368 | sg[i].iov_base = dma_memory_map(vdev->dma_as, |
1369 | addr[i], &len, is_write ? | |
1370 | DMA_DIRECTION_FROM_DEVICE : | |
1371 | DMA_DIRECTION_TO_DEVICE); | |
8059feee | 1372 | if (!sg[i].iov_base) { |
1a285899 | 1373 | error_report("virtio: error trying to map MMIO memory"); |
42fb2e07 KW |
1374 | exit(1); |
1375 | } | |
3b3b0628 PB |
1376 | if (len != sg[i].iov_len) { |
1377 | error_report("virtio: unexpected memory split"); | |
8059feee MT |
1378 | exit(1); |
1379 | } | |
42fb2e07 KW |
1380 | } |
1381 | } | |
1382 | ||
8607f5c3 | 1383 | void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem) |
8059feee | 1384 | { |
22953364 PMD |
1385 | virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, elem->in_num, true); |
1386 | virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, elem->out_num, | |
1387 | false); | |
3724650d PB |
1388 | } |
1389 | ||
bf91bd27 | 1390 | static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num) |
3724650d PB |
1391 | { |
1392 | VirtQueueElement *elem; | |
1393 | size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0])); | |
1394 | size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]); | |
1395 | size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]); | |
1396 | size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0])); | |
1397 | size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); | |
1398 | size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); | |
1399 | ||
1400 | assert(sz >= sizeof(VirtQueueElement)); | |
1401 | elem = g_malloc(out_sg_end); | |
b0ac429f | 1402 | trace_virtqueue_alloc_element(elem, sz, in_num, out_num); |
3724650d PB |
1403 | elem->out_num = out_num; |
1404 | elem->in_num = in_num; | |
1405 | elem->in_addr = (void *)elem + in_addr_ofs; | |
1406 | elem->out_addr = (void *)elem + out_addr_ofs; | |
1407 | elem->in_sg = (void *)elem + in_sg_ofs; | |
1408 | elem->out_sg = (void *)elem + out_sg_ofs; | |
1409 | return elem; | |
8059feee MT |
1410 | } |
1411 | ||
86044b24 | 1412 | static void *virtqueue_split_pop(VirtQueue *vq, size_t sz) |
967f97fa | 1413 | { |
5774cf98 | 1414 | unsigned int i, head, max; |
991976f7 | 1415 | VRingMemoryRegionCaches *caches; |
5eba0404 PB |
1416 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
1417 | MemoryRegionCache *desc_cache; | |
1418 | int64_t len; | |
cee3ca00 | 1419 | VirtIODevice *vdev = vq->vdev; |
9796d0ac | 1420 | VirtQueueElement *elem = NULL; |
37ef70be | 1421 | unsigned out_num, in_num, elem_entries; |
3b3b0628 PB |
1422 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; |
1423 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
aa570d6f | 1424 | VRingDesc desc; |
412e0e81 | 1425 | int rc; |
967f97fa | 1426 | |
b5f53d04 | 1427 | RCU_READ_LOCK_GUARD(); |
97cd965c PB |
1428 | if (virtio_queue_empty_rcu(vq)) { |
1429 | goto done; | |
51b19ebe | 1430 | } |
be1fea9b VM |
1431 | /* Needed after virtio_queue_empty(), see comment in |
1432 | * virtqueue_num_heads(). */ | |
1433 | smp_rmb(); | |
967f97fa AL |
1434 | |
1435 | /* When we start there are none of either input nor output. */ | |
37ef70be | 1436 | out_num = in_num = elem_entries = 0; |
967f97fa | 1437 | |
5774cf98 MM |
1438 | max = vq->vring.num; |
1439 | ||
afd9096e | 1440 | if (vq->inuse >= vq->vring.num) { |
ec55da19 | 1441 | virtio_error(vdev, "Virtqueue size exceeded"); |
97cd965c | 1442 | goto done; |
afd9096e SH |
1443 | } |
1444 | ||
fb1131b6 | 1445 | if (!virtqueue_get_head(vq, vq->last_avail_idx++, &head)) { |
97cd965c | 1446 | goto done; |
fb1131b6 SH |
1447 | } |
1448 | ||
95129d6f | 1449 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 1450 | vring_set_avail_event(vq, vq->last_avail_idx); |
bcbabae8 | 1451 | } |
efeea6d0 | 1452 | |
fb1131b6 | 1453 | i = head; |
9796d0ac | 1454 | |
e0e2d644 | 1455 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
1456 | if (!caches) { |
1457 | virtio_error(vdev, "Region caches not initialized"); | |
1458 | goto done; | |
1459 | } | |
1460 | ||
991976f7 | 1461 | if (caches->desc.len < max * sizeof(VRingDesc)) { |
9796d0ac PB |
1462 | virtio_error(vdev, "Cannot map descriptor ring"); |
1463 | goto done; | |
1464 | } | |
1465 | ||
991976f7 | 1466 | desc_cache = &caches->desc; |
86044b24 | 1467 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
aa570d6f | 1468 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
74231929 | 1469 | if (!desc.len || (desc.len % sizeof(VRingDesc))) { |
ec55da19 | 1470 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
9796d0ac | 1471 | goto done; |
efeea6d0 MM |
1472 | } |
1473 | ||
1474 | /* loop over the indirect descriptor table */ | |
5eba0404 PB |
1475 | len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, |
1476 | desc.addr, desc.len, false); | |
1477 | desc_cache = &indirect_desc_cache; | |
9796d0ac PB |
1478 | if (len < desc.len) { |
1479 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1480 | goto done; | |
1481 | } | |
1482 | ||
aa570d6f | 1483 | max = desc.len / sizeof(VRingDesc); |
efeea6d0 | 1484 | i = 0; |
86044b24 | 1485 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 MM |
1486 | } |
1487 | ||
42fb2e07 | 1488 | /* Collect all the descriptors */ |
967f97fa | 1489 | do { |
ec55da19 SH |
1490 | bool map_ok; |
1491 | ||
aa570d6f | 1492 | if (desc.flags & VRING_DESC_F_WRITE) { |
ec55da19 SH |
1493 | map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num, |
1494 | iov + out_num, | |
1495 | VIRTQUEUE_MAX_SIZE - out_num, true, | |
1496 | desc.addr, desc.len); | |
42fb2e07 | 1497 | } else { |
3b3b0628 | 1498 | if (in_num) { |
ec55da19 SH |
1499 | virtio_error(vdev, "Incorrect order for descriptors"); |
1500 | goto err_undo_map; | |
c8eac1cf | 1501 | } |
ec55da19 SH |
1502 | map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov, |
1503 | VIRTQUEUE_MAX_SIZE, false, | |
1504 | desc.addr, desc.len); | |
1505 | } | |
1506 | if (!map_ok) { | |
1507 | goto err_undo_map; | |
42fb2e07 | 1508 | } |
967f97fa | 1509 | |
967f97fa | 1510 | /* If we've got too many, that implies a descriptor loop. */ |
37ef70be | 1511 | if (++elem_entries > max) { |
ec55da19 SH |
1512 | virtio_error(vdev, "Looped descriptor"); |
1513 | goto err_undo_map; | |
bb6834cf | 1514 | } |
412e0e81 | 1515 | |
86044b24 | 1516 | rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, max, &i); |
412e0e81 SH |
1517 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
1518 | ||
1519 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { | |
1520 | goto err_undo_map; | |
1521 | } | |
967f97fa | 1522 | |
3b3b0628 PB |
1523 | /* Now copy what we have collected and mapped */ |
1524 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
967f97fa | 1525 | elem->index = head; |
86044b24 | 1526 | elem->ndescs = 1; |
3b3b0628 PB |
1527 | for (i = 0; i < out_num; i++) { |
1528 | elem->out_addr[i] = addr[i]; | |
1529 | elem->out_sg[i] = iov[i]; | |
1530 | } | |
1531 | for (i = 0; i < in_num; i++) { | |
1532 | elem->in_addr[i] = addr[out_num + i]; | |
1533 | elem->in_sg[i] = iov[out_num + i]; | |
1534 | } | |
967f97fa AL |
1535 | |
1536 | vq->inuse++; | |
1537 | ||
64979a4d | 1538 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
9796d0ac | 1539 | done: |
5eba0404 | 1540 | address_space_cache_destroy(&indirect_desc_cache); |
9796d0ac | 1541 | |
51b19ebe | 1542 | return elem; |
ec55da19 SH |
1543 | |
1544 | err_undo_map: | |
1545 | virtqueue_undo_map_desc(out_num, in_num, iov); | |
9796d0ac | 1546 | goto done; |
967f97fa AL |
1547 | } |
1548 | ||
86044b24 JW |
1549 | static void *virtqueue_packed_pop(VirtQueue *vq, size_t sz) |
1550 | { | |
1551 | unsigned int i, max; | |
1552 | VRingMemoryRegionCaches *caches; | |
1553 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; | |
1554 | MemoryRegionCache *desc_cache; | |
1555 | int64_t len; | |
1556 | VirtIODevice *vdev = vq->vdev; | |
1557 | VirtQueueElement *elem = NULL; | |
1558 | unsigned out_num, in_num, elem_entries; | |
1559 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; | |
1560 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
1561 | VRingPackedDesc desc; | |
1562 | uint16_t id; | |
1563 | int rc; | |
1564 | ||
b5f53d04 | 1565 | RCU_READ_LOCK_GUARD(); |
86044b24 JW |
1566 | if (virtio_queue_packed_empty_rcu(vq)) { |
1567 | goto done; | |
1568 | } | |
1569 | ||
1570 | /* When we start there are none of either input nor output. */ | |
1571 | out_num = in_num = elem_entries = 0; | |
1572 | ||
1573 | max = vq->vring.num; | |
1574 | ||
1575 | if (vq->inuse >= vq->vring.num) { | |
1576 | virtio_error(vdev, "Virtqueue size exceeded"); | |
1577 | goto done; | |
1578 | } | |
1579 | ||
1580 | i = vq->last_avail_idx; | |
1581 | ||
1582 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
1583 | if (!caches) { |
1584 | virtio_error(vdev, "Region caches not initialized"); | |
1585 | goto done; | |
1586 | } | |
1587 | ||
86044b24 JW |
1588 | if (caches->desc.len < max * sizeof(VRingDesc)) { |
1589 | virtio_error(vdev, "Cannot map descriptor ring"); | |
1590 | goto done; | |
1591 | } | |
1592 | ||
1593 | desc_cache = &caches->desc; | |
1594 | vring_packed_desc_read(vdev, &desc, desc_cache, i, true); | |
1595 | id = desc.id; | |
1596 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
1597 | if (desc.len % sizeof(VRingPackedDesc)) { | |
1598 | virtio_error(vdev, "Invalid size for indirect buffer table"); | |
1599 | goto done; | |
1600 | } | |
1601 | ||
1602 | /* loop over the indirect descriptor table */ | |
1603 | len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, | |
1604 | desc.addr, desc.len, false); | |
1605 | desc_cache = &indirect_desc_cache; | |
1606 | if (len < desc.len) { | |
1607 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1608 | goto done; | |
1609 | } | |
1610 | ||
1611 | max = desc.len / sizeof(VRingPackedDesc); | |
1612 | i = 0; | |
1613 | vring_packed_desc_read(vdev, &desc, desc_cache, i, false); | |
1614 | } | |
1615 | ||
1616 | /* Collect all the descriptors */ | |
1617 | do { | |
1618 | bool map_ok; | |
1619 | ||
1620 | if (desc.flags & VRING_DESC_F_WRITE) { | |
1621 | map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num, | |
1622 | iov + out_num, | |
1623 | VIRTQUEUE_MAX_SIZE - out_num, true, | |
1624 | desc.addr, desc.len); | |
1625 | } else { | |
1626 | if (in_num) { | |
1627 | virtio_error(vdev, "Incorrect order for descriptors"); | |
1628 | goto err_undo_map; | |
1629 | } | |
1630 | map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov, | |
1631 | VIRTQUEUE_MAX_SIZE, false, | |
1632 | desc.addr, desc.len); | |
1633 | } | |
1634 | if (!map_ok) { | |
1635 | goto err_undo_map; | |
1636 | } | |
1637 | ||
1638 | /* If we've got too many, that implies a descriptor loop. */ | |
1639 | if (++elem_entries > max) { | |
1640 | virtio_error(vdev, "Looped descriptor"); | |
1641 | goto err_undo_map; | |
1642 | } | |
1643 | ||
1644 | rc = virtqueue_packed_read_next_desc(vq, &desc, desc_cache, max, &i, | |
1645 | desc_cache == | |
1646 | &indirect_desc_cache); | |
1647 | } while (rc == VIRTQUEUE_READ_DESC_MORE); | |
1648 | ||
1649 | /* Now copy what we have collected and mapped */ | |
1650 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
1651 | for (i = 0; i < out_num; i++) { | |
1652 | elem->out_addr[i] = addr[i]; | |
1653 | elem->out_sg[i] = iov[i]; | |
1654 | } | |
1655 | for (i = 0; i < in_num; i++) { | |
1656 | elem->in_addr[i] = addr[out_num + i]; | |
1657 | elem->in_sg[i] = iov[out_num + i]; | |
1658 | } | |
1659 | ||
1660 | elem->index = id; | |
1661 | elem->ndescs = (desc_cache == &indirect_desc_cache) ? 1 : elem_entries; | |
1662 | vq->last_avail_idx += elem->ndescs; | |
1663 | vq->inuse += elem->ndescs; | |
1664 | ||
1665 | if (vq->last_avail_idx >= vq->vring.num) { | |
1666 | vq->last_avail_idx -= vq->vring.num; | |
1667 | vq->last_avail_wrap_counter ^= 1; | |
1668 | } | |
1669 | ||
1670 | vq->shadow_avail_idx = vq->last_avail_idx; | |
1671 | vq->shadow_avail_wrap_counter = vq->last_avail_wrap_counter; | |
1672 | ||
1673 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); | |
1674 | done: | |
1675 | address_space_cache_destroy(&indirect_desc_cache); | |
86044b24 JW |
1676 | |
1677 | return elem; | |
1678 | ||
1679 | err_undo_map: | |
1680 | virtqueue_undo_map_desc(out_num, in_num, iov); | |
1681 | goto done; | |
1682 | } | |
1683 | ||
1684 | void *virtqueue_pop(VirtQueue *vq, size_t sz) | |
1685 | { | |
9d7bd082 | 1686 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
1687 | return NULL; |
1688 | } | |
1689 | ||
1690 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
1691 | return virtqueue_packed_pop(vq, sz); | |
1692 | } else { | |
1693 | return virtqueue_split_pop(vq, sz); | |
1694 | } | |
1695 | } | |
1696 | ||
1697 | static unsigned int virtqueue_packed_drop_all(VirtQueue *vq) | |
54e17709 | 1698 | { |
86044b24 JW |
1699 | VRingMemoryRegionCaches *caches; |
1700 | MemoryRegionCache *desc_cache; | |
54e17709 YB |
1701 | unsigned int dropped = 0; |
1702 | VirtQueueElement elem = {}; | |
1703 | VirtIODevice *vdev = vq->vdev; | |
86044b24 | 1704 | VRingPackedDesc desc; |
54e17709 | 1705 | |
86044b24 | 1706 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
1707 | if (!caches) { |
1708 | return 0; | |
1709 | } | |
1710 | ||
86044b24 JW |
1711 | desc_cache = &caches->desc; |
1712 | ||
1713 | virtio_queue_set_notification(vq, 0); | |
1714 | ||
1715 | while (vq->inuse < vq->vring.num) { | |
1716 | unsigned int idx = vq->last_avail_idx; | |
1717 | /* | |
1718 | * works similar to virtqueue_pop but does not map buffers | |
1719 | * and does not allocate any memory. | |
1720 | */ | |
1721 | vring_packed_desc_read(vdev, &desc, desc_cache, | |
1722 | vq->last_avail_idx , true); | |
1723 | if (!is_desc_avail(desc.flags, vq->last_avail_wrap_counter)) { | |
1724 | break; | |
1725 | } | |
1726 | elem.index = desc.id; | |
1727 | elem.ndescs = 1; | |
1728 | while (virtqueue_packed_read_next_desc(vq, &desc, desc_cache, | |
1729 | vq->vring.num, &idx, false)) { | |
1730 | ++elem.ndescs; | |
1731 | } | |
1732 | /* | |
1733 | * immediately push the element, nothing to unmap | |
1734 | * as both in_num and out_num are set to 0. | |
1735 | */ | |
1736 | virtqueue_push(vq, &elem, 0); | |
1737 | dropped++; | |
1738 | vq->last_avail_idx += elem.ndescs; | |
1739 | if (vq->last_avail_idx >= vq->vring.num) { | |
1740 | vq->last_avail_idx -= vq->vring.num; | |
1741 | vq->last_avail_wrap_counter ^= 1; | |
1742 | } | |
54e17709 YB |
1743 | } |
1744 | ||
86044b24 JW |
1745 | return dropped; |
1746 | } | |
1747 | ||
1748 | static unsigned int virtqueue_split_drop_all(VirtQueue *vq) | |
1749 | { | |
1750 | unsigned int dropped = 0; | |
1751 | VirtQueueElement elem = {}; | |
1752 | VirtIODevice *vdev = vq->vdev; | |
1753 | bool fEventIdx = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX); | |
1754 | ||
54e17709 YB |
1755 | while (!virtio_queue_empty(vq) && vq->inuse < vq->vring.num) { |
1756 | /* works similar to virtqueue_pop but does not map buffers | |
1757 | * and does not allocate any memory */ | |
1758 | smp_rmb(); | |
1759 | if (!virtqueue_get_head(vq, vq->last_avail_idx, &elem.index)) { | |
1760 | break; | |
1761 | } | |
1762 | vq->inuse++; | |
1763 | vq->last_avail_idx++; | |
1764 | if (fEventIdx) { | |
1765 | vring_set_avail_event(vq, vq->last_avail_idx); | |
1766 | } | |
1767 | /* immediately push the element, nothing to unmap | |
1768 | * as both in_num and out_num are set to 0 */ | |
1769 | virtqueue_push(vq, &elem, 0); | |
1770 | dropped++; | |
1771 | } | |
1772 | ||
1773 | return dropped; | |
1774 | } | |
1775 | ||
86044b24 JW |
1776 | /* virtqueue_drop_all: |
1777 | * @vq: The #VirtQueue | |
1778 | * Drops all queued buffers and indicates them to the guest | |
1779 | * as if they are done. Useful when buffers can not be | |
1780 | * processed but must be returned to the guest. | |
1781 | */ | |
1782 | unsigned int virtqueue_drop_all(VirtQueue *vq) | |
1783 | { | |
1784 | struct VirtIODevice *vdev = vq->vdev; | |
1785 | ||
9d7bd082 | 1786 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
1787 | return 0; |
1788 | } | |
1789 | ||
1790 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
1791 | return virtqueue_packed_drop_all(vq); | |
1792 | } else { | |
1793 | return virtqueue_split_drop_all(vq); | |
1794 | } | |
1795 | } | |
1796 | ||
3724650d PB |
1797 | /* Reading and writing a structure directly to QEMUFile is *awful*, but |
1798 | * it is what QEMU has always done by mistake. We can change it sooner | |
1799 | * or later by bumping the version number of the affected vm states. | |
1800 | * In the meanwhile, since the in-memory layout of VirtQueueElement | |
1801 | * has changed, we need to marshal to and from the layout that was | |
1802 | * used before the change. | |
1803 | */ | |
1804 | typedef struct VirtQueueElementOld { | |
1805 | unsigned int index; | |
1806 | unsigned int out_num; | |
1807 | unsigned int in_num; | |
1808 | hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; | |
1809 | hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; | |
1810 | struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; | |
1811 | struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; | |
1812 | } VirtQueueElementOld; | |
1813 | ||
8607f5c3 | 1814 | void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz) |
ab281c17 | 1815 | { |
3724650d PB |
1816 | VirtQueueElement *elem; |
1817 | VirtQueueElementOld data; | |
1818 | int i; | |
1819 | ||
1820 | qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
1821 | ||
6bdc21c0 MT |
1822 | /* TODO: teach all callers that this can fail, and return failure instead |
1823 | * of asserting here. | |
262a69f4 EB |
1824 | * This is just one thing (there are probably more) that must be |
1825 | * fixed before we can allow NDEBUG compilation. | |
6bdc21c0 | 1826 | */ |
6bdc21c0 MT |
1827 | assert(ARRAY_SIZE(data.in_addr) >= data.in_num); |
1828 | assert(ARRAY_SIZE(data.out_addr) >= data.out_num); | |
1829 | ||
3724650d PB |
1830 | elem = virtqueue_alloc_element(sz, data.out_num, data.in_num); |
1831 | elem->index = data.index; | |
1832 | ||
1833 | for (i = 0; i < elem->in_num; i++) { | |
1834 | elem->in_addr[i] = data.in_addr[i]; | |
1835 | } | |
1836 | ||
1837 | for (i = 0; i < elem->out_num; i++) { | |
1838 | elem->out_addr[i] = data.out_addr[i]; | |
1839 | } | |
1840 | ||
1841 | for (i = 0; i < elem->in_num; i++) { | |
1842 | /* Base is overwritten by virtqueue_map. */ | |
1843 | elem->in_sg[i].iov_base = 0; | |
1844 | elem->in_sg[i].iov_len = data.in_sg[i].iov_len; | |
1845 | } | |
1846 | ||
1847 | for (i = 0; i < elem->out_num; i++) { | |
1848 | /* Base is overwritten by virtqueue_map. */ | |
1849 | elem->out_sg[i].iov_base = 0; | |
1850 | elem->out_sg[i].iov_len = data.out_sg[i].iov_len; | |
1851 | } | |
1852 | ||
86044b24 JW |
1853 | if (virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
1854 | qemu_get_be32s(f, &elem->ndescs); | |
1855 | } | |
1856 | ||
8607f5c3 | 1857 | virtqueue_map(vdev, elem); |
ab281c17 PB |
1858 | return elem; |
1859 | } | |
1860 | ||
86044b24 JW |
1861 | void qemu_put_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, |
1862 | VirtQueueElement *elem) | |
ab281c17 | 1863 | { |
3724650d PB |
1864 | VirtQueueElementOld data; |
1865 | int i; | |
1866 | ||
1867 | memset(&data, 0, sizeof(data)); | |
1868 | data.index = elem->index; | |
1869 | data.in_num = elem->in_num; | |
1870 | data.out_num = elem->out_num; | |
1871 | ||
1872 | for (i = 0; i < elem->in_num; i++) { | |
1873 | data.in_addr[i] = elem->in_addr[i]; | |
1874 | } | |
1875 | ||
1876 | for (i = 0; i < elem->out_num; i++) { | |
1877 | data.out_addr[i] = elem->out_addr[i]; | |
1878 | } | |
1879 | ||
1880 | for (i = 0; i < elem->in_num; i++) { | |
1881 | /* Base is overwritten by virtqueue_map when loading. Do not | |
1882 | * save it, as it would leak the QEMU address space layout. */ | |
1883 | data.in_sg[i].iov_len = elem->in_sg[i].iov_len; | |
1884 | } | |
1885 | ||
1886 | for (i = 0; i < elem->out_num; i++) { | |
1887 | /* Do not save iov_base as above. */ | |
1888 | data.out_sg[i].iov_len = elem->out_sg[i].iov_len; | |
1889 | } | |
86044b24 JW |
1890 | |
1891 | if (virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
1892 | qemu_put_be32s(f, &elem->ndescs); | |
1893 | } | |
1894 | ||
3724650d | 1895 | qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); |
ab281c17 PB |
1896 | } |
1897 | ||
967f97fa | 1898 | /* virtio device */ |
7055e687 MT |
1899 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
1900 | { | |
1c819449 FK |
1901 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1902 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1903 | ||
9d7bd082 | 1904 | if (virtio_device_disabled(vdev)) { |
f5ed3663 SH |
1905 | return; |
1906 | } | |
1907 | ||
1c819449 FK |
1908 | if (k->notify) { |
1909 | k->notify(qbus->parent, vector); | |
7055e687 MT |
1910 | } |
1911 | } | |
967f97fa | 1912 | |
53c25cea | 1913 | void virtio_update_irq(VirtIODevice *vdev) |
967f97fa | 1914 | { |
7055e687 | 1915 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
967f97fa AL |
1916 | } |
1917 | ||
0b352fd6 CH |
1918 | static int virtio_validate_features(VirtIODevice *vdev) |
1919 | { | |
1920 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
1921 | ||
8607f5c3 JW |
1922 | if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM) && |
1923 | !virtio_vdev_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) { | |
1924 | return -EFAULT; | |
1925 | } | |
1926 | ||
0b352fd6 CH |
1927 | if (k->validate_features) { |
1928 | return k->validate_features(vdev); | |
1929 | } else { | |
1930 | return 0; | |
1931 | } | |
1932 | } | |
1933 | ||
1934 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) | |
4e1837f8 | 1935 | { |
181103cd | 1936 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
4e1837f8 SH |
1937 | trace_virtio_set_status(vdev, val); |
1938 | ||
95129d6f | 1939 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
0b352fd6 CH |
1940 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && |
1941 | val & VIRTIO_CONFIG_S_FEATURES_OK) { | |
1942 | int ret = virtio_validate_features(vdev); | |
1943 | ||
1944 | if (ret) { | |
1945 | return ret; | |
1946 | } | |
1947 | } | |
1948 | } | |
e57f2c31 | 1949 | |
4c5cf37b XY |
1950 | if ((vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) != |
1951 | (val & VIRTIO_CONFIG_S_DRIVER_OK)) { | |
1952 | virtio_set_started(vdev, val & VIRTIO_CONFIG_S_DRIVER_OK); | |
1953 | } | |
badaf79c | 1954 | |
181103cd FK |
1955 | if (k->set_status) { |
1956 | k->set_status(vdev, val); | |
4e1837f8 SH |
1957 | } |
1958 | vdev->status = val; | |
badaf79c | 1959 | |
0b352fd6 | 1960 | return 0; |
4e1837f8 SH |
1961 | } |
1962 | ||
616a6552 GK |
1963 | static enum virtio_device_endian virtio_default_endian(void) |
1964 | { | |
1965 | if (target_words_bigendian()) { | |
1966 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
1967 | } else { | |
1968 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
1969 | } | |
1970 | } | |
1971 | ||
1972 | static enum virtio_device_endian virtio_current_cpu_endian(void) | |
1973 | { | |
cdba7e2f | 1974 | if (cpu_virtio_is_big_endian(current_cpu)) { |
616a6552 GK |
1975 | return VIRTIO_DEVICE_ENDIAN_BIG; |
1976 | } else { | |
1977 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
1978 | } | |
1979 | } | |
1980 | ||
53c25cea | 1981 | void virtio_reset(void *opaque) |
967f97fa AL |
1982 | { |
1983 | VirtIODevice *vdev = opaque; | |
181103cd | 1984 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
1985 | int i; |
1986 | ||
e0c472d8 | 1987 | virtio_set_status(vdev, 0); |
616a6552 GK |
1988 | if (current_cpu) { |
1989 | /* Guest initiated reset */ | |
1990 | vdev->device_endian = virtio_current_cpu_endian(); | |
1991 | } else { | |
1992 | /* System reset */ | |
1993 | vdev->device_endian = virtio_default_endian(); | |
1994 | } | |
e0c472d8 | 1995 | |
181103cd FK |
1996 | if (k->reset) { |
1997 | k->reset(vdev); | |
1998 | } | |
967f97fa | 1999 | |
868a8f44 | 2000 | vdev->start_on_kick = false; |
badaf79c | 2001 | vdev->started = false; |
f5ed3663 | 2002 | vdev->broken = false; |
704a76fc | 2003 | vdev->guest_features = 0; |
967f97fa AL |
2004 | vdev->queue_sel = 0; |
2005 | vdev->status = 0; | |
9d7bd082 | 2006 | vdev->disabled = false; |
d73415a3 | 2007 | qatomic_set(&vdev->isr, 0); |
7055e687 MT |
2008 | vdev->config_vector = VIRTIO_NO_VECTOR; |
2009 | virtio_notify_vector(vdev, vdev->config_vector); | |
967f97fa | 2010 | |
87b3bd1c | 2011 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2012 | vdev->vq[i].vring.desc = 0; |
2013 | vdev->vq[i].vring.avail = 0; | |
2014 | vdev->vq[i].vring.used = 0; | |
2015 | vdev->vq[i].last_avail_idx = 0; | |
be1fea9b | 2016 | vdev->vq[i].shadow_avail_idx = 0; |
b796fcd1 | 2017 | vdev->vq[i].used_idx = 0; |
86044b24 JW |
2018 | vdev->vq[i].last_avail_wrap_counter = true; |
2019 | vdev->vq[i].shadow_avail_wrap_counter = true; | |
2020 | vdev->vq[i].used_wrap_counter = true; | |
e0d686bf | 2021 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); |
bcbabae8 MT |
2022 | vdev->vq[i].signalled_used = 0; |
2023 | vdev->vq[i].signalled_used_valid = false; | |
332fa82d | 2024 | vdev->vq[i].notification = true; |
46c5d082 | 2025 | vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; |
4b7f91ed | 2026 | vdev->vq[i].inuse = 0; |
e0e2d644 | 2027 | virtio_virtqueue_reset_region_cache(&vdev->vq[i]); |
967f97fa AL |
2028 | } |
2029 | } | |
2030 | ||
53c25cea | 2031 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2032 | { |
181103cd | 2033 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2034 | uint8_t val; |
2035 | ||
5f5a1318 | 2036 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2037 | return (uint32_t)-1; |
5f5a1318 JW |
2038 | } |
2039 | ||
2040 | k->get_config(vdev, vdev->config); | |
967f97fa | 2041 | |
06dbfc6f | 2042 | val = ldub_p(vdev->config + addr); |
967f97fa AL |
2043 | return val; |
2044 | } | |
2045 | ||
53c25cea | 2046 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2047 | { |
181103cd | 2048 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2049 | uint16_t val; |
2050 | ||
5f5a1318 | 2051 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2052 | return (uint32_t)-1; |
5f5a1318 JW |
2053 | } |
2054 | ||
2055 | k->get_config(vdev, vdev->config); | |
967f97fa | 2056 | |
06dbfc6f | 2057 | val = lduw_p(vdev->config + addr); |
967f97fa AL |
2058 | return val; |
2059 | } | |
2060 | ||
53c25cea | 2061 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2062 | { |
181103cd | 2063 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2064 | uint32_t val; |
2065 | ||
5f5a1318 | 2066 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2067 | return (uint32_t)-1; |
5f5a1318 JW |
2068 | } |
2069 | ||
2070 | k->get_config(vdev, vdev->config); | |
967f97fa | 2071 | |
06dbfc6f | 2072 | val = ldl_p(vdev->config + addr); |
967f97fa AL |
2073 | return val; |
2074 | } | |
2075 | ||
53c25cea | 2076 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2077 | { |
181103cd | 2078 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2079 | uint8_t val = data; |
2080 | ||
5f5a1318 | 2081 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2082 | return; |
5f5a1318 | 2083 | } |
967f97fa | 2084 | |
06dbfc6f | 2085 | stb_p(vdev->config + addr, val); |
967f97fa | 2086 | |
181103cd FK |
2087 | if (k->set_config) { |
2088 | k->set_config(vdev, vdev->config); | |
2089 | } | |
967f97fa AL |
2090 | } |
2091 | ||
53c25cea | 2092 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2093 | { |
181103cd | 2094 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2095 | uint16_t val = data; |
2096 | ||
5f5a1318 | 2097 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2098 | return; |
5f5a1318 | 2099 | } |
967f97fa | 2100 | |
06dbfc6f | 2101 | stw_p(vdev->config + addr, val); |
967f97fa | 2102 | |
181103cd FK |
2103 | if (k->set_config) { |
2104 | k->set_config(vdev, vdev->config); | |
2105 | } | |
967f97fa AL |
2106 | } |
2107 | ||
53c25cea | 2108 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2109 | { |
181103cd | 2110 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2111 | uint32_t val = data; |
2112 | ||
5f5a1318 | 2113 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2114 | return; |
5f5a1318 | 2115 | } |
967f97fa | 2116 | |
06dbfc6f | 2117 | stl_p(vdev->config + addr, val); |
967f97fa | 2118 | |
181103cd FK |
2119 | if (k->set_config) { |
2120 | k->set_config(vdev, vdev->config); | |
2121 | } | |
967f97fa AL |
2122 | } |
2123 | ||
adfb743c MT |
2124 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr) |
2125 | { | |
2126 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2127 | uint8_t val; | |
2128 | ||
2129 | if (addr + sizeof(val) > vdev->config_len) { | |
2130 | return (uint32_t)-1; | |
2131 | } | |
2132 | ||
2133 | k->get_config(vdev, vdev->config); | |
2134 | ||
2135 | val = ldub_p(vdev->config + addr); | |
2136 | return val; | |
2137 | } | |
2138 | ||
2139 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr) | |
2140 | { | |
2141 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2142 | uint16_t val; | |
2143 | ||
2144 | if (addr + sizeof(val) > vdev->config_len) { | |
2145 | return (uint32_t)-1; | |
2146 | } | |
2147 | ||
2148 | k->get_config(vdev, vdev->config); | |
2149 | ||
2150 | val = lduw_le_p(vdev->config + addr); | |
2151 | return val; | |
2152 | } | |
2153 | ||
2154 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr) | |
2155 | { | |
2156 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2157 | uint32_t val; | |
2158 | ||
2159 | if (addr + sizeof(val) > vdev->config_len) { | |
2160 | return (uint32_t)-1; | |
2161 | } | |
2162 | ||
2163 | k->get_config(vdev, vdev->config); | |
2164 | ||
2165 | val = ldl_le_p(vdev->config + addr); | |
2166 | return val; | |
2167 | } | |
2168 | ||
2169 | void virtio_config_modern_writeb(VirtIODevice *vdev, | |
2170 | uint32_t addr, uint32_t data) | |
2171 | { | |
2172 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2173 | uint8_t val = data; | |
2174 | ||
2175 | if (addr + sizeof(val) > vdev->config_len) { | |
2176 | return; | |
2177 | } | |
2178 | ||
2179 | stb_p(vdev->config + addr, val); | |
2180 | ||
2181 | if (k->set_config) { | |
2182 | k->set_config(vdev, vdev->config); | |
2183 | } | |
2184 | } | |
2185 | ||
2186 | void virtio_config_modern_writew(VirtIODevice *vdev, | |
2187 | uint32_t addr, uint32_t data) | |
2188 | { | |
2189 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2190 | uint16_t val = data; | |
2191 | ||
2192 | if (addr + sizeof(val) > vdev->config_len) { | |
2193 | return; | |
2194 | } | |
2195 | ||
2196 | stw_le_p(vdev->config + addr, val); | |
2197 | ||
2198 | if (k->set_config) { | |
2199 | k->set_config(vdev, vdev->config); | |
2200 | } | |
2201 | } | |
2202 | ||
2203 | void virtio_config_modern_writel(VirtIODevice *vdev, | |
2204 | uint32_t addr, uint32_t data) | |
2205 | { | |
2206 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2207 | uint32_t val = data; | |
2208 | ||
2209 | if (addr + sizeof(val) > vdev->config_len) { | |
2210 | return; | |
2211 | } | |
2212 | ||
2213 | stl_le_p(vdev->config + addr, val); | |
2214 | ||
2215 | if (k->set_config) { | |
2216 | k->set_config(vdev, vdev->config); | |
2217 | } | |
2218 | } | |
2219 | ||
a8170e5e | 2220 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) |
967f97fa | 2221 | { |
758ead31 PP |
2222 | if (!vdev->vq[n].vring.num) { |
2223 | return; | |
2224 | } | |
ab223c95 CH |
2225 | vdev->vq[n].vring.desc = addr; |
2226 | virtio_queue_update_rings(vdev, n); | |
53c25cea PB |
2227 | } |
2228 | ||
a8170e5e | 2229 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) |
53c25cea | 2230 | { |
ab223c95 CH |
2231 | return vdev->vq[n].vring.desc; |
2232 | } | |
2233 | ||
2234 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, | |
2235 | hwaddr avail, hwaddr used) | |
2236 | { | |
758ead31 PP |
2237 | if (!vdev->vq[n].vring.num) { |
2238 | return; | |
2239 | } | |
ab223c95 CH |
2240 | vdev->vq[n].vring.desc = desc; |
2241 | vdev->vq[n].vring.avail = avail; | |
2242 | vdev->vq[n].vring.used = used; | |
c611c764 | 2243 | virtio_init_region_cache(vdev, n); |
53c25cea PB |
2244 | } |
2245 | ||
e63c0ba1 PM |
2246 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) |
2247 | { | |
f6049f44 PM |
2248 | /* Don't allow guest to flip queue between existent and |
2249 | * nonexistent states, or to set it to an invalid size. | |
2250 | */ | |
2251 | if (!!num != !!vdev->vq[n].vring.num || | |
2252 | num > VIRTQUEUE_MAX_SIZE || | |
2253 | num < 0) { | |
2254 | return; | |
e63c0ba1 | 2255 | } |
f6049f44 | 2256 | vdev->vq[n].vring.num = num; |
e63c0ba1 PM |
2257 | } |
2258 | ||
e0d686bf JW |
2259 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) |
2260 | { | |
2261 | return QLIST_FIRST(&vdev->vector_queues[vector]); | |
2262 | } | |
2263 | ||
2264 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) | |
2265 | { | |
2266 | return QLIST_NEXT(vq, node); | |
2267 | } | |
2268 | ||
53c25cea PB |
2269 | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
2270 | { | |
2271 | return vdev->vq[n].vring.num; | |
2272 | } | |
967f97fa | 2273 | |
8c797e75 MT |
2274 | int virtio_queue_get_max_num(VirtIODevice *vdev, int n) |
2275 | { | |
2276 | return vdev->vq[n].vring.num_default; | |
2277 | } | |
2278 | ||
8ad176aa JW |
2279 | int virtio_get_num_queues(VirtIODevice *vdev) |
2280 | { | |
2281 | int i; | |
2282 | ||
87b3bd1c | 2283 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
8ad176aa JW |
2284 | if (!virtio_queue_get_num(vdev, i)) { |
2285 | break; | |
2286 | } | |
2287 | } | |
2288 | ||
2289 | return i; | |
2290 | } | |
2291 | ||
6ce69d1c PM |
2292 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) |
2293 | { | |
2294 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2295 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2296 | ||
ab223c95 | 2297 | /* virtio-1 compliant devices cannot change the alignment */ |
95129d6f | 2298 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
ab223c95 CH |
2299 | error_report("tried to modify queue alignment for virtio-1 device"); |
2300 | return; | |
2301 | } | |
6ce69d1c PM |
2302 | /* Check that the transport told us it was going to do this |
2303 | * (so a buggy transport will immediately assert rather than | |
2304 | * silently failing to migrate this state) | |
2305 | */ | |
2306 | assert(k->has_variable_vring_alignment); | |
2307 | ||
758ead31 PP |
2308 | if (align) { |
2309 | vdev->vq[n].vring.align = align; | |
2310 | virtio_queue_update_rings(vdev, n); | |
2311 | } | |
6ce69d1c PM |
2312 | } |
2313 | ||
07931698 | 2314 | static bool virtio_queue_notify_aio_vq(VirtQueue *vq) |
344dc16f | 2315 | { |
badaf79c XY |
2316 | bool ret = false; |
2317 | ||
344dc16f MT |
2318 | if (vq->vring.desc && vq->handle_aio_output) { |
2319 | VirtIODevice *vdev = vq->vdev; | |
2320 | ||
2321 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
badaf79c XY |
2322 | ret = vq->handle_aio_output(vdev, vq); |
2323 | ||
2324 | if (unlikely(vdev->start_on_kick)) { | |
e57f2c31 | 2325 | virtio_set_started(vdev, true); |
badaf79c | 2326 | } |
344dc16f | 2327 | } |
07931698 | 2328 | |
badaf79c | 2329 | return ret; |
344dc16f MT |
2330 | } |
2331 | ||
2b2cbcad | 2332 | static void virtio_queue_notify_vq(VirtQueue *vq) |
25db9ebe | 2333 | { |
9e0f5b81 | 2334 | if (vq->vring.desc && vq->handle_output) { |
25db9ebe | 2335 | VirtIODevice *vdev = vq->vdev; |
9e0f5b81 | 2336 | |
f5ed3663 SH |
2337 | if (unlikely(vdev->broken)) { |
2338 | return; | |
2339 | } | |
2340 | ||
25db9ebe SH |
2341 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
2342 | vq->handle_output(vdev, vq); | |
badaf79c XY |
2343 | |
2344 | if (unlikely(vdev->start_on_kick)) { | |
e57f2c31 | 2345 | virtio_set_started(vdev, true); |
badaf79c | 2346 | } |
25db9ebe SH |
2347 | } |
2348 | } | |
2349 | ||
53c25cea PB |
2350 | void virtio_queue_notify(VirtIODevice *vdev, int n) |
2351 | { | |
e49a6618 PB |
2352 | VirtQueue *vq = &vdev->vq[n]; |
2353 | ||
2354 | if (unlikely(!vq->vring.desc || vdev->broken)) { | |
2355 | return; | |
2356 | } | |
2357 | ||
2358 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
fcccb271 | 2359 | if (vq->host_notifier_enabled) { |
e49a6618 PB |
2360 | event_notifier_set(&vq->host_notifier); |
2361 | } else if (vq->handle_output) { | |
2362 | vq->handle_output(vdev, vq); | |
badaf79c | 2363 | |
8b04e2c7 XY |
2364 | if (unlikely(vdev->start_on_kick)) { |
2365 | virtio_set_started(vdev, true); | |
2366 | } | |
badaf79c | 2367 | } |
967f97fa AL |
2368 | } |
2369 | ||
7055e687 MT |
2370 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) |
2371 | { | |
87b3bd1c | 2372 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : |
7055e687 MT |
2373 | VIRTIO_NO_VECTOR; |
2374 | } | |
2375 | ||
2376 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) | |
2377 | { | |
e0d686bf JW |
2378 | VirtQueue *vq = &vdev->vq[n]; |
2379 | ||
87b3bd1c | 2380 | if (n < VIRTIO_QUEUE_MAX) { |
e0d686bf JW |
2381 | if (vdev->vector_queues && |
2382 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { | |
2383 | QLIST_REMOVE(vq, node); | |
2384 | } | |
7055e687 | 2385 | vdev->vq[n].vector = vector; |
e0d686bf JW |
2386 | if (vdev->vector_queues && |
2387 | vector != VIRTIO_NO_VECTOR) { | |
2388 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); | |
2389 | } | |
2390 | } | |
7055e687 MT |
2391 | } |
2392 | ||
f1ac6a55 PB |
2393 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, |
2394 | VirtIOHandleOutput handle_output) | |
967f97fa AL |
2395 | { |
2396 | int i; | |
2397 | ||
87b3bd1c | 2398 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2399 | if (vdev->vq[i].vring.num == 0) |
2400 | break; | |
2401 | } | |
2402 | ||
87b3bd1c | 2403 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) |
967f97fa AL |
2404 | abort(); |
2405 | ||
2406 | vdev->vq[i].vring.num = queue_size; | |
46c5d082 | 2407 | vdev->vq[i].vring.num_default = queue_size; |
6ce69d1c | 2408 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; |
967f97fa | 2409 | vdev->vq[i].handle_output = handle_output; |
344dc16f | 2410 | vdev->vq[i].handle_aio_output = NULL; |
86044b24 JW |
2411 | vdev->vq[i].used_elems = g_malloc0(sizeof(VirtQueueElement) * |
2412 | queue_size); | |
967f97fa AL |
2413 | |
2414 | return &vdev->vq[i]; | |
2415 | } | |
2416 | ||
722f8c51 MT |
2417 | void virtio_delete_queue(VirtQueue *vq) |
2418 | { | |
2419 | vq->vring.num = 0; | |
2420 | vq->vring.num_default = 0; | |
2421 | vq->handle_output = NULL; | |
2422 | vq->handle_aio_output = NULL; | |
2423 | g_free(vq->used_elems); | |
8cd353ea | 2424 | vq->used_elems = NULL; |
421afd2f | 2425 | virtio_virtqueue_reset_region_cache(vq); |
722f8c51 MT |
2426 | } |
2427 | ||
f23fd811 JW |
2428 | void virtio_del_queue(VirtIODevice *vdev, int n) |
2429 | { | |
87b3bd1c | 2430 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { |
f23fd811 JW |
2431 | abort(); |
2432 | } | |
2433 | ||
722f8c51 | 2434 | virtio_delete_queue(&vdev->vq[n]); |
f23fd811 JW |
2435 | } |
2436 | ||
0687c37c PB |
2437 | static void virtio_set_isr(VirtIODevice *vdev, int value) |
2438 | { | |
d73415a3 | 2439 | uint8_t old = qatomic_read(&vdev->isr); |
0687c37c PB |
2440 | |
2441 | /* Do not write ISR if it does not change, so that its cacheline remains | |
2442 | * shared in the common case where the guest does not read it. | |
2443 | */ | |
2444 | if ((old & value) != value) { | |
d73415a3 | 2445 | qatomic_or(&vdev->isr, value); |
0687c37c PB |
2446 | } |
2447 | } | |
2448 | ||
4c6dd9a0 | 2449 | /* Called within rcu_read_lock(). */ |
683f7665 | 2450 | static bool virtio_split_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
bcbabae8 MT |
2451 | { |
2452 | uint16_t old, new; | |
2453 | bool v; | |
a281ebc1 MT |
2454 | /* We need to expose used array entries before checking used event. */ |
2455 | smp_mb(); | |
97b83deb | 2456 | /* Always notify when queue is empty (when feature acknowledge) */ |
95129d6f | 2457 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && |
be1fea9b | 2458 | !vq->inuse && virtio_queue_empty(vq)) { |
bcbabae8 MT |
2459 | return true; |
2460 | } | |
2461 | ||
95129d6f | 2462 | if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
bcbabae8 MT |
2463 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); |
2464 | } | |
2465 | ||
2466 | v = vq->signalled_used_valid; | |
2467 | vq->signalled_used_valid = true; | |
2468 | old = vq->signalled_used; | |
b796fcd1 | 2469 | new = vq->signalled_used = vq->used_idx; |
e9600c6c | 2470 | return !v || vring_need_event(vring_get_used_event(vq), new, old); |
bcbabae8 MT |
2471 | } |
2472 | ||
683f7665 JW |
2473 | static bool vring_packed_need_event(VirtQueue *vq, bool wrap, |
2474 | uint16_t off_wrap, uint16_t new, | |
2475 | uint16_t old) | |
2476 | { | |
2477 | int off = off_wrap & ~(1 << 15); | |
2478 | ||
2479 | if (wrap != off_wrap >> 15) { | |
2480 | off -= vq->vring.num; | |
2481 | } | |
2482 | ||
2483 | return vring_need_event(off, new, old); | |
2484 | } | |
2485 | ||
4c6dd9a0 | 2486 | /* Called within rcu_read_lock(). */ |
683f7665 JW |
2487 | static bool virtio_packed_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
2488 | { | |
2489 | VRingPackedDescEvent e; | |
2490 | uint16_t old, new; | |
2491 | bool v; | |
2492 | VRingMemoryRegionCaches *caches; | |
2493 | ||
2494 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
2495 | if (!caches) { |
2496 | return false; | |
2497 | } | |
2498 | ||
683f7665 JW |
2499 | vring_packed_event_read(vdev, &caches->avail, &e); |
2500 | ||
2501 | old = vq->signalled_used; | |
2502 | new = vq->signalled_used = vq->used_idx; | |
2503 | v = vq->signalled_used_valid; | |
2504 | vq->signalled_used_valid = true; | |
2505 | ||
2506 | if (e.flags == VRING_PACKED_EVENT_FLAG_DISABLE) { | |
2507 | return false; | |
2508 | } else if (e.flags == VRING_PACKED_EVENT_FLAG_ENABLE) { | |
2509 | return true; | |
2510 | } | |
2511 | ||
2512 | return !v || vring_packed_need_event(vq, vq->used_wrap_counter, | |
2513 | e.off_wrap, new, old); | |
2514 | } | |
2515 | ||
2516 | /* Called within rcu_read_lock(). */ | |
2517 | static bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq) | |
2518 | { | |
2519 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
2520 | return virtio_packed_should_notify(vdev, vq); | |
2521 | } else { | |
2522 | return virtio_split_should_notify(vdev, vq); | |
2523 | } | |
2524 | } | |
2525 | ||
83d768b5 PB |
2526 | void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq) |
2527 | { | |
b5f53d04 DDAG |
2528 | WITH_RCU_READ_LOCK_GUARD() { |
2529 | if (!virtio_should_notify(vdev, vq)) { | |
2530 | return; | |
2531 | } | |
83d768b5 PB |
2532 | } |
2533 | ||
2534 | trace_virtio_notify_irqfd(vdev, vq); | |
2535 | ||
2536 | /* | |
2537 | * virtio spec 1.0 says ISR bit 0 should be ignored with MSI, but | |
2538 | * windows drivers included in virtio-win 1.8.0 (circa 2015) are | |
2539 | * incorrectly polling this bit during crashdump and hibernation | |
2540 | * in MSI mode, causing a hang if this bit is never updated. | |
2541 | * Recent releases of Windows do not really shut down, but rather | |
2542 | * log out and hibernate to make the next startup faster. Hence, | |
2543 | * this manifested as a more serious hang during shutdown with | |
2544 | * | |
2545 | * Next driver release from 2016 fixed this problem, so working around it | |
2546 | * is not a must, but it's easy to do so let's do it here. | |
2547 | * | |
2548 | * Note: it's safe to update ISR from any thread as it was switched | |
2549 | * to an atomic operation. | |
2550 | */ | |
2551 | virtio_set_isr(vq->vdev, 0x1); | |
2552 | event_notifier_set(&vq->guest_notifier); | |
2553 | } | |
2554 | ||
b4b9862b MT |
2555 | static void virtio_irq(VirtQueue *vq) |
2556 | { | |
2557 | virtio_set_isr(vq->vdev, 0x1); | |
2558 | virtio_notify_vector(vq->vdev, vq->vector); | |
2559 | } | |
2560 | ||
bcbabae8 MT |
2561 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) |
2562 | { | |
b5f53d04 DDAG |
2563 | WITH_RCU_READ_LOCK_GUARD() { |
2564 | if (!virtio_should_notify(vdev, vq)) { | |
2565 | return; | |
2566 | } | |
bcbabae8 | 2567 | } |
967f97fa | 2568 | |
64979a4d | 2569 | trace_virtio_notify(vdev, vq); |
b4b9862b | 2570 | virtio_irq(vq); |
967f97fa AL |
2571 | } |
2572 | ||
2573 | void virtio_notify_config(VirtIODevice *vdev) | |
2574 | { | |
7625162c AL |
2575 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) |
2576 | return; | |
2577 | ||
0687c37c | 2578 | virtio_set_isr(vdev, 0x3); |
b8f05908 | 2579 | vdev->generation++; |
7055e687 | 2580 | virtio_notify_vector(vdev, vdev->config_vector); |
967f97fa AL |
2581 | } |
2582 | ||
616a6552 GK |
2583 | static bool virtio_device_endian_needed(void *opaque) |
2584 | { | |
2585 | VirtIODevice *vdev = opaque; | |
2586 | ||
2587 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); | |
95129d6f | 2588 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
3c185597 CH |
2589 | return vdev->device_endian != virtio_default_endian(); |
2590 | } | |
2591 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
2592 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; | |
616a6552 GK |
2593 | } |
2594 | ||
019a3edb GH |
2595 | static bool virtio_64bit_features_needed(void *opaque) |
2596 | { | |
2597 | VirtIODevice *vdev = opaque; | |
2598 | ||
2599 | return (vdev->host_features >> 32) != 0; | |
2600 | } | |
2601 | ||
74aae7b2 JW |
2602 | static bool virtio_virtqueue_needed(void *opaque) |
2603 | { | |
2604 | VirtIODevice *vdev = opaque; | |
2605 | ||
2606 | return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1); | |
2607 | } | |
2608 | ||
86044b24 JW |
2609 | static bool virtio_packed_virtqueue_needed(void *opaque) |
2610 | { | |
2611 | VirtIODevice *vdev = opaque; | |
2612 | ||
2613 | return virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED); | |
2614 | } | |
2615 | ||
46c5d082 CH |
2616 | static bool virtio_ringsize_needed(void *opaque) |
2617 | { | |
2618 | VirtIODevice *vdev = opaque; | |
2619 | int i; | |
2620 | ||
2621 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
2622 | if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) { | |
2623 | return true; | |
2624 | } | |
2625 | } | |
2626 | return false; | |
2627 | } | |
2628 | ||
a6df8adf JW |
2629 | static bool virtio_extra_state_needed(void *opaque) |
2630 | { | |
2631 | VirtIODevice *vdev = opaque; | |
2632 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2633 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2634 | ||
2635 | return k->has_extra_state && | |
2636 | k->has_extra_state(qbus->parent); | |
2637 | } | |
2638 | ||
791b1daf SH |
2639 | static bool virtio_broken_needed(void *opaque) |
2640 | { | |
2641 | VirtIODevice *vdev = opaque; | |
2642 | ||
2643 | return vdev->broken; | |
2644 | } | |
2645 | ||
badaf79c XY |
2646 | static bool virtio_started_needed(void *opaque) |
2647 | { | |
2648 | VirtIODevice *vdev = opaque; | |
2649 | ||
2650 | return vdev->started; | |
2651 | } | |
2652 | ||
9d7bd082 MR |
2653 | static bool virtio_disabled_needed(void *opaque) |
2654 | { | |
2655 | VirtIODevice *vdev = opaque; | |
2656 | ||
2657 | return vdev->disabled; | |
2658 | } | |
2659 | ||
50e5ae4d | 2660 | static const VMStateDescription vmstate_virtqueue = { |
74aae7b2 | 2661 | .name = "virtqueue_state", |
50e5ae4d DDAG |
2662 | .version_id = 1, |
2663 | .minimum_version_id = 1, | |
2664 | .fields = (VMStateField[]) { | |
2665 | VMSTATE_UINT64(vring.avail, struct VirtQueue), | |
2666 | VMSTATE_UINT64(vring.used, struct VirtQueue), | |
2667 | VMSTATE_END_OF_LIST() | |
2668 | } | |
74aae7b2 JW |
2669 | }; |
2670 | ||
86044b24 JW |
2671 | static const VMStateDescription vmstate_packed_virtqueue = { |
2672 | .name = "packed_virtqueue_state", | |
2673 | .version_id = 1, | |
2674 | .minimum_version_id = 1, | |
2675 | .fields = (VMStateField[]) { | |
2676 | VMSTATE_UINT16(last_avail_idx, struct VirtQueue), | |
2677 | VMSTATE_BOOL(last_avail_wrap_counter, struct VirtQueue), | |
2678 | VMSTATE_UINT16(used_idx, struct VirtQueue), | |
2679 | VMSTATE_BOOL(used_wrap_counter, struct VirtQueue), | |
2680 | VMSTATE_UINT32(inuse, struct VirtQueue), | |
2681 | VMSTATE_END_OF_LIST() | |
2682 | } | |
2683 | }; | |
2684 | ||
74aae7b2 JW |
2685 | static const VMStateDescription vmstate_virtio_virtqueues = { |
2686 | .name = "virtio/virtqueues", | |
2687 | .version_id = 1, | |
2688 | .minimum_version_id = 1, | |
2689 | .needed = &virtio_virtqueue_needed, | |
2690 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
2691 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
2692 | VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue), | |
74aae7b2 JW |
2693 | VMSTATE_END_OF_LIST() |
2694 | } | |
2695 | }; | |
2696 | ||
86044b24 JW |
2697 | static const VMStateDescription vmstate_virtio_packed_virtqueues = { |
2698 | .name = "virtio/packed_virtqueues", | |
2699 | .version_id = 1, | |
2700 | .minimum_version_id = 1, | |
2701 | .needed = &virtio_packed_virtqueue_needed, | |
2702 | .fields = (VMStateField[]) { | |
2703 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, | |
2704 | VIRTIO_QUEUE_MAX, 0, vmstate_packed_virtqueue, VirtQueue), | |
2705 | VMSTATE_END_OF_LIST() | |
2706 | } | |
2707 | }; | |
2708 | ||
50e5ae4d | 2709 | static const VMStateDescription vmstate_ringsize = { |
46c5d082 | 2710 | .name = "ringsize_state", |
50e5ae4d DDAG |
2711 | .version_id = 1, |
2712 | .minimum_version_id = 1, | |
2713 | .fields = (VMStateField[]) { | |
2714 | VMSTATE_UINT32(vring.num_default, struct VirtQueue), | |
2715 | VMSTATE_END_OF_LIST() | |
2716 | } | |
46c5d082 CH |
2717 | }; |
2718 | ||
2719 | static const VMStateDescription vmstate_virtio_ringsize = { | |
2720 | .name = "virtio/ringsize", | |
2721 | .version_id = 1, | |
2722 | .minimum_version_id = 1, | |
2723 | .needed = &virtio_ringsize_needed, | |
2724 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
2725 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
2726 | VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue), | |
46c5d082 CH |
2727 | VMSTATE_END_OF_LIST() |
2728 | } | |
2729 | }; | |
2730 | ||
2c21ee76 | 2731 | static int get_extra_state(QEMUFile *f, void *pv, size_t size, |
03fee66f | 2732 | const VMStateField *field) |
a6df8adf JW |
2733 | { |
2734 | VirtIODevice *vdev = pv; | |
2735 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2736 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2737 | ||
2738 | if (!k->load_extra_state) { | |
2739 | return -1; | |
2740 | } else { | |
2741 | return k->load_extra_state(qbus->parent, f); | |
2742 | } | |
2743 | } | |
2744 | ||
2c21ee76 | 2745 | static int put_extra_state(QEMUFile *f, void *pv, size_t size, |
3ddba9a9 | 2746 | const VMStateField *field, JSONWriter *vmdesc) |
a6df8adf JW |
2747 | { |
2748 | VirtIODevice *vdev = pv; | |
2749 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2750 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2751 | ||
2752 | k->save_extra_state(qbus->parent, f); | |
2c21ee76 | 2753 | return 0; |
a6df8adf JW |
2754 | } |
2755 | ||
2756 | static const VMStateInfo vmstate_info_extra_state = { | |
2757 | .name = "virtqueue_extra_state", | |
2758 | .get = get_extra_state, | |
2759 | .put = put_extra_state, | |
2760 | }; | |
2761 | ||
2762 | static const VMStateDescription vmstate_virtio_extra_state = { | |
2763 | .name = "virtio/extra_state", | |
2764 | .version_id = 1, | |
2765 | .minimum_version_id = 1, | |
2766 | .needed = &virtio_extra_state_needed, | |
2767 | .fields = (VMStateField[]) { | |
2768 | { | |
2769 | .name = "extra_state", | |
2770 | .version_id = 0, | |
2771 | .field_exists = NULL, | |
2772 | .size = 0, | |
2773 | .info = &vmstate_info_extra_state, | |
2774 | .flags = VMS_SINGLE, | |
2775 | .offset = 0, | |
2776 | }, | |
2777 | VMSTATE_END_OF_LIST() | |
2778 | } | |
2779 | }; | |
2780 | ||
616a6552 GK |
2781 | static const VMStateDescription vmstate_virtio_device_endian = { |
2782 | .name = "virtio/device_endian", | |
2783 | .version_id = 1, | |
2784 | .minimum_version_id = 1, | |
5cd8cada | 2785 | .needed = &virtio_device_endian_needed, |
616a6552 GK |
2786 | .fields = (VMStateField[]) { |
2787 | VMSTATE_UINT8(device_endian, VirtIODevice), | |
2788 | VMSTATE_END_OF_LIST() | |
2789 | } | |
2790 | }; | |
2791 | ||
019a3edb GH |
2792 | static const VMStateDescription vmstate_virtio_64bit_features = { |
2793 | .name = "virtio/64bit_features", | |
2794 | .version_id = 1, | |
2795 | .minimum_version_id = 1, | |
5cd8cada | 2796 | .needed = &virtio_64bit_features_needed, |
019a3edb GH |
2797 | .fields = (VMStateField[]) { |
2798 | VMSTATE_UINT64(guest_features, VirtIODevice), | |
2799 | VMSTATE_END_OF_LIST() | |
2800 | } | |
2801 | }; | |
2802 | ||
791b1daf SH |
2803 | static const VMStateDescription vmstate_virtio_broken = { |
2804 | .name = "virtio/broken", | |
2805 | .version_id = 1, | |
2806 | .minimum_version_id = 1, | |
2807 | .needed = &virtio_broken_needed, | |
2808 | .fields = (VMStateField[]) { | |
2809 | VMSTATE_BOOL(broken, VirtIODevice), | |
2810 | VMSTATE_END_OF_LIST() | |
2811 | } | |
2812 | }; | |
2813 | ||
badaf79c XY |
2814 | static const VMStateDescription vmstate_virtio_started = { |
2815 | .name = "virtio/started", | |
2816 | .version_id = 1, | |
2817 | .minimum_version_id = 1, | |
2818 | .needed = &virtio_started_needed, | |
2819 | .fields = (VMStateField[]) { | |
2820 | VMSTATE_BOOL(started, VirtIODevice), | |
2821 | VMSTATE_END_OF_LIST() | |
2822 | } | |
2823 | }; | |
2824 | ||
9d7bd082 MR |
2825 | static const VMStateDescription vmstate_virtio_disabled = { |
2826 | .name = "virtio/disabled", | |
2827 | .version_id = 1, | |
2828 | .minimum_version_id = 1, | |
2829 | .needed = &virtio_disabled_needed, | |
2830 | .fields = (VMStateField[]) { | |
2831 | VMSTATE_BOOL(disabled, VirtIODevice), | |
2832 | VMSTATE_END_OF_LIST() | |
2833 | } | |
2834 | }; | |
2835 | ||
6b321a3d GK |
2836 | static const VMStateDescription vmstate_virtio = { |
2837 | .name = "virtio", | |
2838 | .version_id = 1, | |
2839 | .minimum_version_id = 1, | |
2840 | .minimum_version_id_old = 1, | |
2841 | .fields = (VMStateField[]) { | |
2842 | VMSTATE_END_OF_LIST() | |
616a6552 | 2843 | }, |
5cd8cada JQ |
2844 | .subsections = (const VMStateDescription*[]) { |
2845 | &vmstate_virtio_device_endian, | |
2846 | &vmstate_virtio_64bit_features, | |
74aae7b2 | 2847 | &vmstate_virtio_virtqueues, |
46c5d082 | 2848 | &vmstate_virtio_ringsize, |
791b1daf | 2849 | &vmstate_virtio_broken, |
a6df8adf | 2850 | &vmstate_virtio_extra_state, |
badaf79c | 2851 | &vmstate_virtio_started, |
86044b24 | 2852 | &vmstate_virtio_packed_virtqueues, |
9d7bd082 | 2853 | &vmstate_virtio_disabled, |
5cd8cada | 2854 | NULL |
6b321a3d GK |
2855 | } |
2856 | }; | |
2857 | ||
2f168d07 | 2858 | int virtio_save(VirtIODevice *vdev, QEMUFile *f) |
967f97fa | 2859 | { |
1c819449 FK |
2860 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
2861 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 2862 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
019a3edb | 2863 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); |
967f97fa AL |
2864 | int i; |
2865 | ||
1c819449 FK |
2866 | if (k->save_config) { |
2867 | k->save_config(qbus->parent, f); | |
2868 | } | |
967f97fa | 2869 | |
967f97fa AL |
2870 | qemu_put_8s(f, &vdev->status); |
2871 | qemu_put_8s(f, &vdev->isr); | |
2872 | qemu_put_be16s(f, &vdev->queue_sel); | |
019a3edb | 2873 | qemu_put_be32s(f, &guest_features_lo); |
967f97fa AL |
2874 | qemu_put_be32(f, vdev->config_len); |
2875 | qemu_put_buffer(f, vdev->config, vdev->config_len); | |
2876 | ||
87b3bd1c | 2877 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2878 | if (vdev->vq[i].vring.num == 0) |
2879 | break; | |
2880 | } | |
2881 | ||
2882 | qemu_put_be32(f, i); | |
2883 | ||
87b3bd1c | 2884 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2885 | if (vdev->vq[i].vring.num == 0) |
2886 | break; | |
2887 | ||
2888 | qemu_put_be32(f, vdev->vq[i].vring.num); | |
6ce69d1c PM |
2889 | if (k->has_variable_vring_alignment) { |
2890 | qemu_put_be32(f, vdev->vq[i].vring.align); | |
2891 | } | |
874adf45 SH |
2892 | /* |
2893 | * Save desc now, the rest of the ring addresses are saved in | |
2894 | * subsections for VIRTIO-1 devices. | |
2895 | */ | |
ab223c95 | 2896 | qemu_put_be64(f, vdev->vq[i].vring.desc); |
967f97fa | 2897 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
1c819449 FK |
2898 | if (k->save_queue) { |
2899 | k->save_queue(qbus->parent, i, f); | |
2900 | } | |
967f97fa | 2901 | } |
1b5fc0de GK |
2902 | |
2903 | if (vdc->save != NULL) { | |
2904 | vdc->save(vdev, f); | |
2905 | } | |
6b321a3d | 2906 | |
ea43e259 | 2907 | if (vdc->vmsd) { |
2f168d07 DDAG |
2908 | int ret = vmstate_save_state(f, vdc->vmsd, vdev, NULL); |
2909 | if (ret) { | |
2910 | return ret; | |
2911 | } | |
ea43e259 DDAG |
2912 | } |
2913 | ||
6b321a3d | 2914 | /* Subsections */ |
2f168d07 | 2915 | return vmstate_save_state(f, &vmstate_virtio, vdev, NULL); |
967f97fa AL |
2916 | } |
2917 | ||
1a665855 | 2918 | /* A wrapper for use as a VMState .put function */ |
2c21ee76 | 2919 | static int virtio_device_put(QEMUFile *f, void *opaque, size_t size, |
3ddba9a9 | 2920 | const VMStateField *field, JSONWriter *vmdesc) |
1a665855 | 2921 | { |
2f168d07 | 2922 | return virtio_save(VIRTIO_DEVICE(opaque), f); |
1a665855 HP |
2923 | } |
2924 | ||
2925 | /* A wrapper for use as a VMState .get function */ | |
2c21ee76 | 2926 | static int virtio_device_get(QEMUFile *f, void *opaque, size_t size, |
03fee66f | 2927 | const VMStateField *field) |
1a665855 HP |
2928 | { |
2929 | VirtIODevice *vdev = VIRTIO_DEVICE(opaque); | |
2930 | DeviceClass *dc = DEVICE_CLASS(VIRTIO_DEVICE_GET_CLASS(vdev)); | |
2931 | ||
2932 | return virtio_load(vdev, f, dc->vmsd->version_id); | |
2933 | } | |
2934 | ||
2935 | const VMStateInfo virtio_vmstate_info = { | |
2936 | .name = "virtio", | |
2937 | .get = virtio_device_get, | |
2938 | .put = virtio_device_put, | |
2939 | }; | |
2940 | ||
6c0196d7 | 2941 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) |
ad0c9332 | 2942 | { |
181103cd | 2943 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
6b8f1020 | 2944 | bool bad = (val & ~(vdev->host_features)) != 0; |
ad0c9332 | 2945 | |
6b8f1020 | 2946 | val &= vdev->host_features; |
181103cd FK |
2947 | if (k->set_features) { |
2948 | k->set_features(vdev, val); | |
ad0c9332 PB |
2949 | } |
2950 | vdev->guest_features = val; | |
2951 | return bad ? -1 : 0; | |
2952 | } | |
2953 | ||
6c0196d7 CH |
2954 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) |
2955 | { | |
db812c40 PB |
2956 | int ret; |
2957 | /* | |
6c0196d7 CH |
2958 | * The driver must not attempt to set features after feature negotiation |
2959 | * has finished. | |
2960 | */ | |
2961 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { | |
2962 | return -EINVAL; | |
2963 | } | |
db812c40 | 2964 | ret = virtio_set_features_nocheck(vdev, val); |
2d69eba5 LQ |
2965 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
2966 | /* VIRTIO_RING_F_EVENT_IDX changes the size of the caches. */ | |
2967 | int i; | |
2968 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
2969 | if (vdev->vq[i].vring.num != 0) { | |
2970 | virtio_init_region_cache(vdev, i); | |
db812c40 PB |
2971 | } |
2972 | } | |
2d69eba5 LQ |
2973 | } |
2974 | if (!ret) { | |
868a8f44 XY |
2975 | if (!virtio_device_started(vdev, vdev->status) && |
2976 | !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
2977 | vdev->start_on_kick = true; | |
2978 | } | |
db812c40 PB |
2979 | } |
2980 | return ret; | |
6c0196d7 CH |
2981 | } |
2982 | ||
4c21e353 | 2983 | size_t virtio_feature_get_config_size(const VirtIOFeature *feature_sizes, |
ba550851 SG |
2984 | uint64_t host_features) |
2985 | { | |
2986 | size_t config_size = 0; | |
2987 | int i; | |
2988 | ||
2989 | for (i = 0; feature_sizes[i].flags != 0; i++) { | |
2990 | if (host_features & feature_sizes[i].flags) { | |
2991 | config_size = MAX(feature_sizes[i].end, config_size); | |
2992 | } | |
2993 | } | |
2994 | ||
2995 | return config_size; | |
2996 | } | |
2997 | ||
1b5fc0de | 2998 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |
967f97fa | 2999 | { |
cc459952 | 3000 | int i, ret; |
a890a2f9 | 3001 | int32_t config_len; |
cc459952 | 3002 | uint32_t num; |
6d74ca5a | 3003 | uint32_t features; |
1c819449 FK |
3004 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3005 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 3006 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa | 3007 | |
616a6552 GK |
3008 | /* |
3009 | * We poison the endianness to ensure it does not get used before | |
3010 | * subsections have been loaded. | |
3011 | */ | |
3012 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; | |
3013 | ||
1c819449 FK |
3014 | if (k->load_config) { |
3015 | ret = k->load_config(qbus->parent, f); | |
ff24bd58 MT |
3016 | if (ret) |
3017 | return ret; | |
3018 | } | |
967f97fa | 3019 | |
967f97fa AL |
3020 | qemu_get_8s(f, &vdev->status); |
3021 | qemu_get_8s(f, &vdev->isr); | |
3022 | qemu_get_be16s(f, &vdev->queue_sel); | |
87b3bd1c | 3023 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { |
4b53c2c7 MR |
3024 | return -1; |
3025 | } | |
6d74ca5a | 3026 | qemu_get_be32s(f, &features); |
ad0c9332 | 3027 | |
62cee1a2 MT |
3028 | /* |
3029 | * Temporarily set guest_features low bits - needed by | |
3030 | * virtio net load code testing for VIRTIO_NET_F_CTRL_GUEST_OFFLOADS | |
3031 | * VIRTIO_NET_F_GUEST_ANNOUNCE and VIRTIO_NET_F_CTRL_VQ. | |
3032 | * | |
3033 | * Note: devices should always test host features in future - don't create | |
3034 | * new dependencies like this. | |
3035 | */ | |
3036 | vdev->guest_features = features; | |
3037 | ||
a890a2f9 | 3038 | config_len = qemu_get_be32(f); |
2f5732e9 DDAG |
3039 | |
3040 | /* | |
3041 | * There are cases where the incoming config can be bigger or smaller | |
3042 | * than what we have; so load what we have space for, and skip | |
3043 | * any excess that's in the stream. | |
3044 | */ | |
3045 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); | |
3046 | ||
3047 | while (config_len > vdev->config_len) { | |
3048 | qemu_get_byte(f); | |
3049 | config_len--; | |
a890a2f9 | 3050 | } |
967f97fa AL |
3051 | |
3052 | num = qemu_get_be32(f); | |
3053 | ||
87b3bd1c | 3054 | if (num > VIRTIO_QUEUE_MAX) { |
8a1be662 | 3055 | error_report("Invalid number of virtqueues: 0x%x", num); |
cc459952 MT |
3056 | return -1; |
3057 | } | |
3058 | ||
967f97fa AL |
3059 | for (i = 0; i < num; i++) { |
3060 | vdev->vq[i].vring.num = qemu_get_be32(f); | |
6ce69d1c PM |
3061 | if (k->has_variable_vring_alignment) { |
3062 | vdev->vq[i].vring.align = qemu_get_be32(f); | |
3063 | } | |
ab223c95 | 3064 | vdev->vq[i].vring.desc = qemu_get_be64(f); |
967f97fa | 3065 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
bcbabae8 | 3066 | vdev->vq[i].signalled_used_valid = false; |
332fa82d | 3067 | vdev->vq[i].notification = true; |
967f97fa | 3068 | |
874adf45 | 3069 | if (!vdev->vq[i].vring.desc && vdev->vq[i].last_avail_idx) { |
1abeb5a6 | 3070 | error_report("VQ %d address 0x0 " |
6daf194d | 3071 | "inconsistent with Host index 0x%x", |
1abeb5a6 | 3072 | i, vdev->vq[i].last_avail_idx); |
874adf45 | 3073 | return -1; |
8275e2f6 | 3074 | } |
1c819449 FK |
3075 | if (k->load_queue) { |
3076 | ret = k->load_queue(qbus->parent, i, f); | |
ff24bd58 MT |
3077 | if (ret) |
3078 | return ret; | |
7055e687 | 3079 | } |
967f97fa AL |
3080 | } |
3081 | ||
7055e687 | 3082 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
1b5fc0de GK |
3083 | |
3084 | if (vdc->load != NULL) { | |
6b321a3d GK |
3085 | ret = vdc->load(vdev, f, version_id); |
3086 | if (ret) { | |
3087 | return ret; | |
3088 | } | |
1b5fc0de GK |
3089 | } |
3090 | ||
ea43e259 DDAG |
3091 | if (vdc->vmsd) { |
3092 | ret = vmstate_load_state(f, vdc->vmsd, vdev, version_id); | |
3093 | if (ret) { | |
3094 | return ret; | |
3095 | } | |
3096 | } | |
3097 | ||
616a6552 GK |
3098 | /* Subsections */ |
3099 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); | |
3100 | if (ret) { | |
3101 | return ret; | |
3102 | } | |
3103 | ||
3104 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { | |
3105 | vdev->device_endian = virtio_default_endian(); | |
3106 | } | |
3107 | ||
019a3edb GH |
3108 | if (virtio_64bit_features_needed(vdev)) { |
3109 | /* | |
3110 | * Subsection load filled vdev->guest_features. Run them | |
3111 | * through virtio_set_features to sanity-check them against | |
3112 | * host_features. | |
3113 | */ | |
3114 | uint64_t features64 = vdev->guest_features; | |
6c0196d7 | 3115 | if (virtio_set_features_nocheck(vdev, features64) < 0) { |
019a3edb GH |
3116 | error_report("Features 0x%" PRIx64 " unsupported. " |
3117 | "Allowed features: 0x%" PRIx64, | |
3118 | features64, vdev->host_features); | |
3119 | return -1; | |
3120 | } | |
3121 | } else { | |
6c0196d7 | 3122 | if (virtio_set_features_nocheck(vdev, features) < 0) { |
019a3edb GH |
3123 | error_report("Features 0x%x unsupported. " |
3124 | "Allowed features: 0x%" PRIx64, | |
3125 | features, vdev->host_features); | |
3126 | return -1; | |
3127 | } | |
3128 | } | |
3129 | ||
868a8f44 XY |
3130 | if (!virtio_device_started(vdev, vdev->status) && |
3131 | !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
3132 | vdev->start_on_kick = true; | |
3133 | } | |
3134 | ||
b5f53d04 | 3135 | RCU_READ_LOCK_GUARD(); |
616a6552 | 3136 | for (i = 0; i < num; i++) { |
ab223c95 | 3137 | if (vdev->vq[i].vring.desc) { |
616a6552 | 3138 | uint16_t nheads; |
874adf45 SH |
3139 | |
3140 | /* | |
3141 | * VIRTIO-1 devices migrate desc, used, and avail ring addresses so | |
3142 | * only the region cache needs to be set up. Legacy devices need | |
3143 | * to calculate used and avail ring addresses based on the desc | |
3144 | * address. | |
3145 | */ | |
3146 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
3147 | virtio_init_region_cache(vdev, i); | |
3148 | } else { | |
3149 | virtio_queue_update_rings(vdev, i); | |
3150 | } | |
3151 | ||
86044b24 JW |
3152 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3153 | vdev->vq[i].shadow_avail_idx = vdev->vq[i].last_avail_idx; | |
3154 | vdev->vq[i].shadow_avail_wrap_counter = | |
3155 | vdev->vq[i].last_avail_wrap_counter; | |
3156 | continue; | |
3157 | } | |
3158 | ||
616a6552 GK |
3159 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; |
3160 | /* Check it isn't doing strange things with descriptor numbers. */ | |
3161 | if (nheads > vdev->vq[i].vring.num) { | |
4aedda25 JL |
3162 | virtio_error(vdev, "VQ %d size 0x%x Guest index 0x%x " |
3163 | "inconsistent with Host index 0x%x: delta 0x%x", | |
3164 | i, vdev->vq[i].vring.num, | |
3165 | vring_avail_idx(&vdev->vq[i]), | |
3166 | vdev->vq[i].last_avail_idx, nheads); | |
3167 | vdev->vq[i].used_idx = 0; | |
3168 | vdev->vq[i].shadow_avail_idx = 0; | |
3169 | vdev->vq[i].inuse = 0; | |
3170 | continue; | |
616a6552 | 3171 | } |
b796fcd1 | 3172 | vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]); |
be1fea9b | 3173 | vdev->vq[i].shadow_avail_idx = vring_avail_idx(&vdev->vq[i]); |
bccdef6b SH |
3174 | |
3175 | /* | |
3176 | * Some devices migrate VirtQueueElements that have been popped | |
3177 | * from the avail ring but not yet returned to the used ring. | |
e66bcc40 HP |
3178 | * Since max ring size < UINT16_MAX it's safe to use modulo |
3179 | * UINT16_MAX + 1 subtraction. | |
bccdef6b | 3180 | */ |
e66bcc40 HP |
3181 | vdev->vq[i].inuse = (uint16_t)(vdev->vq[i].last_avail_idx - |
3182 | vdev->vq[i].used_idx); | |
bccdef6b SH |
3183 | if (vdev->vq[i].inuse > vdev->vq[i].vring.num) { |
3184 | error_report("VQ %d size 0x%x < last_avail_idx 0x%x - " | |
3185 | "used_idx 0x%x", | |
3186 | i, vdev->vq[i].vring.num, | |
3187 | vdev->vq[i].last_avail_idx, | |
3188 | vdev->vq[i].used_idx); | |
3189 | return -1; | |
3190 | } | |
616a6552 GK |
3191 | } |
3192 | } | |
3193 | ||
1dd71383 MT |
3194 | if (vdc->post_load) { |
3195 | ret = vdc->post_load(vdev); | |
3196 | if (ret) { | |
3197 | return ret; | |
3198 | } | |
3199 | } | |
3200 | ||
616a6552 | 3201 | return 0; |
967f97fa AL |
3202 | } |
3203 | ||
6a1a8cc7 | 3204 | void virtio_cleanup(VirtIODevice *vdev) |
b946a153 | 3205 | { |
85cf2a8d | 3206 | qemu_del_vm_change_state_handler(vdev->vmstate); |
8e05db92 FK |
3207 | } |
3208 | ||
538f0497 | 3209 | static void virtio_vmstate_change(void *opaque, bool running, RunState state) |
85cf2a8d MT |
3210 | { |
3211 | VirtIODevice *vdev = opaque; | |
1c819449 FK |
3212 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3213 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
e57f2c31 | 3214 | bool backend_run = running && virtio_device_started(vdev, vdev->status); |
9e8e8c48 | 3215 | vdev->vm_running = running; |
85cf2a8d MT |
3216 | |
3217 | if (backend_run) { | |
3218 | virtio_set_status(vdev, vdev->status); | |
3219 | } | |
3220 | ||
1c819449 FK |
3221 | if (k->vmstate_change) { |
3222 | k->vmstate_change(qbus->parent, backend_run); | |
85cf2a8d MT |
3223 | } |
3224 | ||
3225 | if (!backend_run) { | |
3226 | virtio_set_status(vdev, vdev->status); | |
3227 | } | |
3228 | } | |
3229 | ||
c8075caf GA |
3230 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
3231 | size_t vdev_size, const char *vdev_name) | |
3232 | { | |
3233 | DeviceState *vdev = data; | |
3234 | ||
9fc7fc4d MA |
3235 | object_initialize_child_with_props(proxy_obj, "virtio-backend", vdev, |
3236 | vdev_size, vdev_name, &error_abort, | |
3237 | NULL); | |
c8075caf GA |
3238 | qdev_alias_all_properties(vdev, proxy_obj); |
3239 | } | |
3240 | ||
8e05db92 FK |
3241 | void virtio_init(VirtIODevice *vdev, const char *name, |
3242 | uint16_t device_id, size_t config_size) | |
967f97fa | 3243 | { |
e0d686bf JW |
3244 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3245 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
b8193adb | 3246 | int i; |
e0d686bf JW |
3247 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; |
3248 | ||
3249 | if (nvectors) { | |
3250 | vdev->vector_queues = | |
3251 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); | |
3252 | } | |
3253 | ||
868a8f44 | 3254 | vdev->start_on_kick = false; |
badaf79c | 3255 | vdev->started = false; |
53c25cea | 3256 | vdev->device_id = device_id; |
967f97fa | 3257 | vdev->status = 0; |
d73415a3 | 3258 | qatomic_set(&vdev->isr, 0); |
967f97fa | 3259 | vdev->queue_sel = 0; |
7055e687 | 3260 | vdev->config_vector = VIRTIO_NO_VECTOR; |
87b3bd1c | 3261 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); |
1354869c | 3262 | vdev->vm_running = runstate_is_running(); |
f5ed3663 | 3263 | vdev->broken = false; |
87b3bd1c | 3264 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
b8193adb | 3265 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
1cbdabe2 | 3266 | vdev->vq[i].vdev = vdev; |
e78a2b42 | 3267 | vdev->vq[i].queue_index = i; |
fcccb271 | 3268 | vdev->vq[i].host_notifier_enabled = false; |
1cbdabe2 | 3269 | } |
967f97fa | 3270 | |
967f97fa AL |
3271 | vdev->name = name; |
3272 | vdev->config_len = config_size; | |
8e05db92 | 3273 | if (vdev->config_len) { |
7267c094 | 3274 | vdev->config = g_malloc0(config_size); |
8e05db92 | 3275 | } else { |
967f97fa | 3276 | vdev->config = NULL; |
8e05db92 | 3277 | } |
1a8c091c SH |
3278 | vdev->vmstate = qdev_add_vm_change_state_handler(DEVICE(vdev), |
3279 | virtio_vmstate_change, vdev); | |
616a6552 | 3280 | vdev->device_endian = virtio_default_endian(); |
5669655a | 3281 | vdev->use_guest_notifier_mask = true; |
8e05db92 | 3282 | } |
967f97fa | 3283 | |
7c78bdd7 CH |
3284 | /* |
3285 | * Only devices that have already been around prior to defining the virtio | |
3286 | * standard support legacy mode; this includes devices not specified in the | |
3287 | * standard. All newer devices conform to the virtio standard only. | |
3288 | */ | |
3289 | bool virtio_legacy_allowed(VirtIODevice *vdev) | |
3290 | { | |
3291 | switch (vdev->device_id) { | |
3292 | case VIRTIO_ID_NET: | |
3293 | case VIRTIO_ID_BLOCK: | |
3294 | case VIRTIO_ID_CONSOLE: | |
3295 | case VIRTIO_ID_RNG: | |
3296 | case VIRTIO_ID_BALLOON: | |
3297 | case VIRTIO_ID_RPMSG: | |
3298 | case VIRTIO_ID_SCSI: | |
3299 | case VIRTIO_ID_9P: | |
3300 | case VIRTIO_ID_RPROC_SERIAL: | |
3301 | case VIRTIO_ID_CAIF: | |
3302 | return true; | |
3303 | default: | |
3304 | return false; | |
3305 | } | |
3306 | } | |
3307 | ||
d55f5182 SG |
3308 | bool virtio_legacy_check_disabled(VirtIODevice *vdev) |
3309 | { | |
3310 | return vdev->disable_legacy_check; | |
3311 | } | |
3312 | ||
a8170e5e | 3313 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3314 | { |
3315 | return vdev->vq[n].vring.desc; | |
3316 | } | |
3317 | ||
0c9753eb LV |
3318 | bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n) |
3319 | { | |
3320 | return virtio_queue_get_desc_addr(vdev, n) != 0; | |
3321 | } | |
3322 | ||
23bfaf77 JW |
3323 | bool virtio_queue_enabled(VirtIODevice *vdev, int n) |
3324 | { | |
b2a5f62a JW |
3325 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3326 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
3327 | ||
3328 | if (k->queue_enabled) { | |
3329 | return k->queue_enabled(qbus->parent, n); | |
3330 | } | |
0c9753eb | 3331 | return virtio_queue_enabled_legacy(vdev, n); |
23bfaf77 JW |
3332 | } |
3333 | ||
a8170e5e | 3334 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3335 | { |
3336 | return vdev->vq[n].vring.avail; | |
3337 | } | |
3338 | ||
a8170e5e | 3339 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3340 | { |
3341 | return vdev->vq[n].vring.used; | |
3342 | } | |
3343 | ||
a8170e5e | 3344 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3345 | { |
3346 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; | |
3347 | } | |
3348 | ||
a8170e5e | 3349 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) |
1cbdabe2 | 3350 | { |
f90cda63 WX |
3351 | int s; |
3352 | ||
86044b24 JW |
3353 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3354 | return sizeof(struct VRingPackedDescEvent); | |
3355 | } | |
3356 | ||
f90cda63 | 3357 | s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; |
1cbdabe2 | 3358 | return offsetof(VRingAvail, ring) + |
f90cda63 | 3359 | sizeof(uint16_t) * vdev->vq[n].vring.num + s; |
1cbdabe2 MT |
3360 | } |
3361 | ||
a8170e5e | 3362 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) |
1cbdabe2 | 3363 | { |
f90cda63 WX |
3364 | int s; |
3365 | ||
86044b24 JW |
3366 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3367 | return sizeof(struct VRingPackedDescEvent); | |
3368 | } | |
3369 | ||
f90cda63 | 3370 | s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; |
1cbdabe2 | 3371 | return offsetof(VRingUsed, ring) + |
f90cda63 | 3372 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num + s; |
1cbdabe2 MT |
3373 | } |
3374 | ||
86044b24 JW |
3375 | static unsigned int virtio_queue_packed_get_last_avail_idx(VirtIODevice *vdev, |
3376 | int n) | |
3377 | { | |
3378 | unsigned int avail, used; | |
3379 | ||
3380 | avail = vdev->vq[n].last_avail_idx; | |
3381 | avail |= ((uint16_t)vdev->vq[n].last_avail_wrap_counter) << 15; | |
3382 | ||
3383 | used = vdev->vq[n].used_idx; | |
3384 | used |= ((uint16_t)vdev->vq[n].used_wrap_counter) << 15; | |
3385 | ||
3386 | return avail | used << 16; | |
3387 | } | |
3388 | ||
3389 | static uint16_t virtio_queue_split_get_last_avail_idx(VirtIODevice *vdev, | |
3390 | int n) | |
1cbdabe2 MT |
3391 | { |
3392 | return vdev->vq[n].last_avail_idx; | |
3393 | } | |
3394 | ||
86044b24 | 3395 | unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) |
1cbdabe2 | 3396 | { |
86044b24 JW |
3397 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3398 | return virtio_queue_packed_get_last_avail_idx(vdev, n); | |
3399 | } else { | |
3400 | return virtio_queue_split_get_last_avail_idx(vdev, n); | |
3401 | } | |
1cbdabe2 MT |
3402 | } |
3403 | ||
86044b24 JW |
3404 | static void virtio_queue_packed_set_last_avail_idx(VirtIODevice *vdev, |
3405 | int n, unsigned int idx) | |
3406 | { | |
3407 | struct VirtQueue *vq = &vdev->vq[n]; | |
3408 | ||
3409 | vq->last_avail_idx = vq->shadow_avail_idx = idx & 0x7fff; | |
3410 | vq->last_avail_wrap_counter = | |
3411 | vq->shadow_avail_wrap_counter = !!(idx & 0x8000); | |
3412 | idx >>= 16; | |
3413 | vq->used_idx = idx & 0x7ffff; | |
3414 | vq->used_wrap_counter = !!(idx & 0x8000); | |
3415 | } | |
3416 | ||
3417 | static void virtio_queue_split_set_last_avail_idx(VirtIODevice *vdev, | |
3418 | int n, unsigned int idx) | |
3419 | { | |
3420 | vdev->vq[n].last_avail_idx = idx; | |
3421 | vdev->vq[n].shadow_avail_idx = idx; | |
3422 | } | |
3423 | ||
3424 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, | |
3425 | unsigned int idx) | |
3426 | { | |
3427 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3428 | virtio_queue_packed_set_last_avail_idx(vdev, n, idx); | |
3429 | } else { | |
3430 | virtio_queue_split_set_last_avail_idx(vdev, n, idx); | |
3431 | } | |
3432 | } | |
3433 | ||
3434 | static void virtio_queue_packed_restore_last_avail_idx(VirtIODevice *vdev, | |
3435 | int n) | |
3436 | { | |
3437 | /* We don't have a reference like avail idx in shared memory */ | |
3438 | return; | |
3439 | } | |
3440 | ||
3441 | static void virtio_queue_split_restore_last_avail_idx(VirtIODevice *vdev, | |
3442 | int n) | |
2d4ba6cc | 3443 | { |
b5f53d04 | 3444 | RCU_READ_LOCK_GUARD(); |
2d4ba6cc MC |
3445 | if (vdev->vq[n].vring.desc) { |
3446 | vdev->vq[n].last_avail_idx = vring_used_idx(&vdev->vq[n]); | |
3447 | vdev->vq[n].shadow_avail_idx = vdev->vq[n].last_avail_idx; | |
3448 | } | |
2d4ba6cc MC |
3449 | } |
3450 | ||
86044b24 JW |
3451 | void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n) |
3452 | { | |
3453 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3454 | virtio_queue_packed_restore_last_avail_idx(vdev, n); | |
3455 | } else { | |
3456 | virtio_queue_split_restore_last_avail_idx(vdev, n); | |
3457 | } | |
3458 | } | |
3459 | ||
3460 | static void virtio_queue_packed_update_used_idx(VirtIODevice *vdev, int n) | |
3461 | { | |
3462 | /* used idx was updated through set_last_avail_idx() */ | |
3463 | return; | |
3464 | } | |
3465 | ||
3466 | static void virtio_split_packed_update_used_idx(VirtIODevice *vdev, int n) | |
312d3b35 | 3467 | { |
b5f53d04 | 3468 | RCU_READ_LOCK_GUARD(); |
ca0176ad PB |
3469 | if (vdev->vq[n].vring.desc) { |
3470 | vdev->vq[n].used_idx = vring_used_idx(&vdev->vq[n]); | |
3471 | } | |
312d3b35 YB |
3472 | } |
3473 | ||
86044b24 JW |
3474 | void virtio_queue_update_used_idx(VirtIODevice *vdev, int n) |
3475 | { | |
3476 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3477 | return virtio_queue_packed_update_used_idx(vdev, n); | |
3478 | } else { | |
3479 | return virtio_split_packed_update_used_idx(vdev, n); | |
3480 | } | |
3481 | } | |
3482 | ||
6793dfd1 SH |
3483 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) |
3484 | { | |
3485 | vdev->vq[n].signalled_used_valid = false; | |
3486 | } | |
3487 | ||
1cbdabe2 MT |
3488 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) |
3489 | { | |
3490 | return vdev->vq + n; | |
3491 | } | |
3492 | ||
e78a2b42 JW |
3493 | uint16_t virtio_get_queue_index(VirtQueue *vq) |
3494 | { | |
3495 | return vq->queue_index; | |
3496 | } | |
3497 | ||
15b2bd18 PB |
3498 | static void virtio_queue_guest_notifier_read(EventNotifier *n) |
3499 | { | |
3500 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); | |
3501 | if (event_notifier_test_and_clear(n)) { | |
b4b9862b | 3502 | virtio_irq(vq); |
15b2bd18 PB |
3503 | } |
3504 | } | |
3505 | ||
3506 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, | |
3507 | bool with_irqfd) | |
3508 | { | |
3509 | if (assign && !with_irqfd) { | |
d6da1e9e | 3510 | event_notifier_set_handler(&vq->guest_notifier, |
15b2bd18 PB |
3511 | virtio_queue_guest_notifier_read); |
3512 | } else { | |
d6da1e9e | 3513 | event_notifier_set_handler(&vq->guest_notifier, NULL); |
15b2bd18 PB |
3514 | } |
3515 | if (!assign) { | |
3516 | /* Test and clear notifier before closing it, | |
3517 | * in case poll callback didn't have time to run. */ | |
3518 | virtio_queue_guest_notifier_read(&vq->guest_notifier); | |
3519 | } | |
3520 | } | |
3521 | ||
1cbdabe2 MT |
3522 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
3523 | { | |
3524 | return &vq->guest_notifier; | |
3525 | } | |
b1f416aa | 3526 | |
344dc16f | 3527 | static void virtio_queue_host_notifier_aio_read(EventNotifier *n) |
b1f416aa PB |
3528 | { |
3529 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3530 | if (event_notifier_test_and_clear(n)) { | |
344dc16f | 3531 | virtio_queue_notify_aio_vq(vq); |
b1f416aa PB |
3532 | } |
3533 | } | |
3534 | ||
a7c8215e SH |
3535 | static void virtio_queue_host_notifier_aio_poll_begin(EventNotifier *n) |
3536 | { | |
3537 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3538 | ||
3539 | virtio_queue_set_notification(vq, 0); | |
3540 | } | |
3541 | ||
0062ea0f SH |
3542 | static bool virtio_queue_host_notifier_aio_poll(void *opaque) |
3543 | { | |
3544 | EventNotifier *n = opaque; | |
3545 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3546 | ||
dd3dd4ba | 3547 | if (!vq->vring.desc || virtio_queue_empty(vq)) { |
0062ea0f SH |
3548 | return false; |
3549 | } | |
3550 | ||
d0435bc5 | 3551 | return virtio_queue_notify_aio_vq(vq); |
0062ea0f SH |
3552 | } |
3553 | ||
a7c8215e SH |
3554 | static void virtio_queue_host_notifier_aio_poll_end(EventNotifier *n) |
3555 | { | |
3556 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3557 | ||
3558 | /* Caller polls once more after this to catch requests that race with us */ | |
3559 | virtio_queue_set_notification(vq, 1); | |
3560 | } | |
3561 | ||
a1afb606 | 3562 | void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, |
07931698 | 3563 | VirtIOHandleAIOOutput handle_output) |
a1afb606 | 3564 | { |
a378b49a PB |
3565 | if (handle_output) { |
3566 | vq->handle_aio_output = handle_output; | |
a1afb606 | 3567 | aio_set_event_notifier(ctx, &vq->host_notifier, true, |
0062ea0f SH |
3568 | virtio_queue_host_notifier_aio_read, |
3569 | virtio_queue_host_notifier_aio_poll); | |
a7c8215e SH |
3570 | aio_set_event_notifier_poll(ctx, &vq->host_notifier, |
3571 | virtio_queue_host_notifier_aio_poll_begin, | |
3572 | virtio_queue_host_notifier_aio_poll_end); | |
a1afb606 | 3573 | } else { |
f6a51c84 | 3574 | aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL, NULL); |
a1afb606 PB |
3575 | /* Test and clear notifier before after disabling event, |
3576 | * in case poll callback didn't have time to run. */ | |
344dc16f | 3577 | virtio_queue_host_notifier_aio_read(&vq->host_notifier); |
a378b49a | 3578 | vq->handle_aio_output = NULL; |
344dc16f MT |
3579 | } |
3580 | } | |
3581 | ||
fa283a4a | 3582 | void virtio_queue_host_notifier_read(EventNotifier *n) |
344dc16f MT |
3583 | { |
3584 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3585 | if (event_notifier_test_and_clear(n)) { | |
3586 | virtio_queue_notify_vq(vq); | |
a1afb606 PB |
3587 | } |
3588 | } | |
3589 | ||
1cbdabe2 MT |
3590 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
3591 | { | |
3592 | return &vq->host_notifier; | |
3593 | } | |
8e05db92 | 3594 | |
fcccb271 SH |
3595 | void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled) |
3596 | { | |
3597 | vq->host_notifier_enabled = enabled; | |
3598 | } | |
3599 | ||
6f80e617 TB |
3600 | int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n, |
3601 | MemoryRegion *mr, bool assign) | |
3602 | { | |
3603 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3604 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
3605 | ||
3606 | if (k->set_host_notifier_mr) { | |
3607 | return k->set_host_notifier_mr(qbus->parent, n, mr, assign); | |
3608 | } | |
3609 | ||
3610 | return -1; | |
3611 | } | |
3612 | ||
1034e9cf FK |
3613 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) |
3614 | { | |
9e288406 | 3615 | g_free(vdev->bus_name); |
80e0090a | 3616 | vdev->bus_name = g_strdup(bus_name); |
1034e9cf FK |
3617 | } |
3618 | ||
f5ed3663 SH |
3619 | void GCC_FMT_ATTR(2, 3) virtio_error(VirtIODevice *vdev, const char *fmt, ...) |
3620 | { | |
3621 | va_list ap; | |
3622 | ||
3623 | va_start(ap, fmt); | |
3624 | error_vreport(fmt, ap); | |
3625 | va_end(ap); | |
3626 | ||
f5ed3663 | 3627 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
8fc47c87 | 3628 | vdev->status = vdev->status | VIRTIO_CONFIG_S_NEEDS_RESET; |
f5ed3663 SH |
3629 | virtio_notify_config(vdev); |
3630 | } | |
66453cff GK |
3631 | |
3632 | vdev->broken = true; | |
f5ed3663 SH |
3633 | } |
3634 | ||
c611c764 PB |
3635 | static void virtio_memory_listener_commit(MemoryListener *listener) |
3636 | { | |
3637 | VirtIODevice *vdev = container_of(listener, VirtIODevice, listener); | |
3638 | int i; | |
3639 | ||
3640 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
3641 | if (vdev->vq[i].vring.num == 0) { | |
3642 | break; | |
3643 | } | |
3644 | virtio_init_region_cache(vdev, i); | |
3645 | } | |
3646 | } | |
3647 | ||
1d244b42 AF |
3648 | static void virtio_device_realize(DeviceState *dev, Error **errp) |
3649 | { | |
3650 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
3651 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
3652 | Error *err = NULL; | |
3653 | ||
ea43e259 DDAG |
3654 | /* Devices should either use vmsd or the load/save methods */ |
3655 | assert(!vdc->vmsd || !vdc->load); | |
3656 | ||
1d244b42 AF |
3657 | if (vdc->realize != NULL) { |
3658 | vdc->realize(dev, &err); | |
3659 | if (err != NULL) { | |
3660 | error_propagate(errp, err); | |
3661 | return; | |
3662 | } | |
8e05db92 | 3663 | } |
e8398045 JW |
3664 | |
3665 | virtio_bus_device_plugged(vdev, &err); | |
3666 | if (err != NULL) { | |
3667 | error_propagate(errp, err); | |
b69c3c21 | 3668 | vdc->unrealize(dev); |
e8398045 JW |
3669 | return; |
3670 | } | |
c611c764 PB |
3671 | |
3672 | vdev->listener.commit = virtio_memory_listener_commit; | |
3673 | memory_listener_register(&vdev->listener, vdev->dma_as); | |
8e05db92 FK |
3674 | } |
3675 | ||
b69c3c21 | 3676 | static void virtio_device_unrealize(DeviceState *dev) |
1034e9cf | 3677 | { |
1d244b42 | 3678 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
306ec6c3 | 3679 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
1d244b42 | 3680 | |
f6ab64c0 | 3681 | memory_listener_unregister(&vdev->listener); |
83d07047 PB |
3682 | virtio_bus_device_unplugged(vdev); |
3683 | ||
306ec6c3 | 3684 | if (vdc->unrealize != NULL) { |
b69c3c21 | 3685 | vdc->unrealize(dev); |
5e96f5d2 | 3686 | } |
1d244b42 | 3687 | |
9e288406 MA |
3688 | g_free(vdev->bus_name); |
3689 | vdev->bus_name = NULL; | |
1034e9cf FK |
3690 | } |
3691 | ||
c611c764 PB |
3692 | static void virtio_device_free_virtqueues(VirtIODevice *vdev) |
3693 | { | |
3694 | int i; | |
3695 | if (!vdev->vq) { | |
3696 | return; | |
3697 | } | |
3698 | ||
3699 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
c611c764 PB |
3700 | if (vdev->vq[i].vring.num == 0) { |
3701 | break; | |
3702 | } | |
e0e2d644 | 3703 | virtio_virtqueue_reset_region_cache(&vdev->vq[i]); |
c611c764 PB |
3704 | } |
3705 | g_free(vdev->vq); | |
3706 | } | |
3707 | ||
3708 | static void virtio_device_instance_finalize(Object *obj) | |
3709 | { | |
3710 | VirtIODevice *vdev = VIRTIO_DEVICE(obj); | |
3711 | ||
c611c764 PB |
3712 | virtio_device_free_virtqueues(vdev); |
3713 | ||
3714 | g_free(vdev->config); | |
3715 | g_free(vdev->vector_queues); | |
3716 | } | |
3717 | ||
6b8f1020 CH |
3718 | static Property virtio_properties[] = { |
3719 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), | |
e57f2c31 | 3720 | DEFINE_PROP_BOOL("use-started", VirtIODevice, use_started, true), |
9d7bd082 | 3721 | DEFINE_PROP_BOOL("use-disabled-flag", VirtIODevice, use_disabled_flag, true), |
d55f5182 SG |
3722 | DEFINE_PROP_BOOL("x-disable-legacy-check", VirtIODevice, |
3723 | disable_legacy_check, false), | |
6b8f1020 CH |
3724 | DEFINE_PROP_END_OF_LIST(), |
3725 | }; | |
3726 | ||
ff4c07df PB |
3727 | static int virtio_device_start_ioeventfd_impl(VirtIODevice *vdev) |
3728 | { | |
3729 | VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); | |
710fccf8 | 3730 | int i, n, r, err; |
ff4c07df | 3731 | |
9cf4fd87 GK |
3732 | /* |
3733 | * Batch all the host notifiers in a single transaction to avoid | |
3734 | * quadratic time complexity in address_space_update_ioeventfds(). | |
3735 | */ | |
710fccf8 | 3736 | memory_region_transaction_begin(); |
ff4c07df | 3737 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
fa283a4a | 3738 | VirtQueue *vq = &vdev->vq[n]; |
ff4c07df PB |
3739 | if (!virtio_queue_get_num(vdev, n)) { |
3740 | continue; | |
3741 | } | |
ed08a2a0 | 3742 | r = virtio_bus_set_host_notifier(qbus, n, true); |
ff4c07df PB |
3743 | if (r < 0) { |
3744 | err = r; | |
3745 | goto assign_error; | |
3746 | } | |
d6da1e9e | 3747 | event_notifier_set_handler(&vq->host_notifier, |
fa283a4a | 3748 | virtio_queue_host_notifier_read); |
6019f3b9 PB |
3749 | } |
3750 | ||
3751 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { | |
3752 | /* Kick right away to begin processing requests already in vring */ | |
3753 | VirtQueue *vq = &vdev->vq[n]; | |
3754 | if (!vq->vring.num) { | |
3755 | continue; | |
3756 | } | |
3757 | event_notifier_set(&vq->host_notifier); | |
ff4c07df | 3758 | } |
710fccf8 | 3759 | memory_region_transaction_commit(); |
ff4c07df PB |
3760 | return 0; |
3761 | ||
3762 | assign_error: | |
710fccf8 | 3763 | i = n; /* save n for a second iteration after transaction is committed. */ |
ff4c07df | 3764 | while (--n >= 0) { |
fa283a4a | 3765 | VirtQueue *vq = &vdev->vq[n]; |
ff4c07df PB |
3766 | if (!virtio_queue_get_num(vdev, n)) { |
3767 | continue; | |
3768 | } | |
3769 | ||
d6da1e9e | 3770 | event_notifier_set_handler(&vq->host_notifier, NULL); |
ed08a2a0 | 3771 | r = virtio_bus_set_host_notifier(qbus, n, false); |
ff4c07df | 3772 | assert(r >= 0); |
710fccf8 | 3773 | } |
9cf4fd87 GK |
3774 | /* |
3775 | * The transaction expects the ioeventfds to be open when it | |
3776 | * commits. Do it now, before the cleanup loop. | |
3777 | */ | |
710fccf8 GH |
3778 | memory_region_transaction_commit(); |
3779 | ||
3780 | while (--i >= 0) { | |
3781 | if (!virtio_queue_get_num(vdev, i)) { | |
3782 | continue; | |
3783 | } | |
3784 | virtio_bus_cleanup_host_notifier(qbus, i); | |
ff4c07df PB |
3785 | } |
3786 | return err; | |
3787 | } | |
3788 | ||
3789 | int virtio_device_start_ioeventfd(VirtIODevice *vdev) | |
3790 | { | |
3791 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3792 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3793 | ||
3794 | return virtio_bus_start_ioeventfd(vbus); | |
3795 | } | |
3796 | ||
3797 | static void virtio_device_stop_ioeventfd_impl(VirtIODevice *vdev) | |
3798 | { | |
3799 | VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); | |
ff4c07df PB |
3800 | int n, r; |
3801 | ||
9cf4fd87 GK |
3802 | /* |
3803 | * Batch all the host notifiers in a single transaction to avoid | |
3804 | * quadratic time complexity in address_space_update_ioeventfds(). | |
3805 | */ | |
710fccf8 | 3806 | memory_region_transaction_begin(); |
ff4c07df | 3807 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
fa283a4a PB |
3808 | VirtQueue *vq = &vdev->vq[n]; |
3809 | ||
ff4c07df PB |
3810 | if (!virtio_queue_get_num(vdev, n)) { |
3811 | continue; | |
3812 | } | |
d6da1e9e | 3813 | event_notifier_set_handler(&vq->host_notifier, NULL); |
ed08a2a0 | 3814 | r = virtio_bus_set_host_notifier(qbus, n, false); |
ff4c07df | 3815 | assert(r >= 0); |
710fccf8 | 3816 | } |
9cf4fd87 GK |
3817 | /* |
3818 | * The transaction expects the ioeventfds to be open when it | |
3819 | * commits. Do it now, before the cleanup loop. | |
3820 | */ | |
710fccf8 GH |
3821 | memory_region_transaction_commit(); |
3822 | ||
3823 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { | |
3824 | if (!virtio_queue_get_num(vdev, n)) { | |
3825 | continue; | |
3826 | } | |
76143618 | 3827 | virtio_bus_cleanup_host_notifier(qbus, n); |
ff4c07df PB |
3828 | } |
3829 | } | |
3830 | ||
310837de PB |
3831 | int virtio_device_grab_ioeventfd(VirtIODevice *vdev) |
3832 | { | |
3833 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3834 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3835 | ||
3836 | return virtio_bus_grab_ioeventfd(vbus); | |
3837 | } | |
3838 | ||
3839 | void virtio_device_release_ioeventfd(VirtIODevice *vdev) | |
3840 | { | |
3841 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3842 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3843 | ||
3844 | virtio_bus_release_ioeventfd(vbus); | |
3845 | } | |
3846 | ||
8e05db92 FK |
3847 | static void virtio_device_class_init(ObjectClass *klass, void *data) |
3848 | { | |
3849 | /* Set the default value here. */ | |
ff4c07df | 3850 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
8e05db92 | 3851 | DeviceClass *dc = DEVICE_CLASS(klass); |
1d244b42 AF |
3852 | |
3853 | dc->realize = virtio_device_realize; | |
3854 | dc->unrealize = virtio_device_unrealize; | |
8e05db92 | 3855 | dc->bus_type = TYPE_VIRTIO_BUS; |
4f67d30b | 3856 | device_class_set_props(dc, virtio_properties); |
ff4c07df PB |
3857 | vdc->start_ioeventfd = virtio_device_start_ioeventfd_impl; |
3858 | vdc->stop_ioeventfd = virtio_device_stop_ioeventfd_impl; | |
9b706dbb MT |
3859 | |
3860 | vdc->legacy_features |= VIRTIO_LEGACY_FEATURES; | |
8e05db92 FK |
3861 | } |
3862 | ||
8e93cef1 PB |
3863 | bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev) |
3864 | { | |
3865 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3866 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3867 | ||
3868 | return virtio_bus_ioeventfd_enabled(vbus); | |
3869 | } | |
3870 | ||
8e05db92 FK |
3871 | static const TypeInfo virtio_device_info = { |
3872 | .name = TYPE_VIRTIO_DEVICE, | |
3873 | .parent = TYPE_DEVICE, | |
3874 | .instance_size = sizeof(VirtIODevice), | |
3875 | .class_init = virtio_device_class_init, | |
c611c764 | 3876 | .instance_finalize = virtio_device_instance_finalize, |
8e05db92 FK |
3877 | .abstract = true, |
3878 | .class_size = sizeof(VirtioDeviceClass), | |
3879 | }; | |
3880 | ||
3881 | static void virtio_register_types(void) | |
3882 | { | |
3883 | type_register_static(&virtio_device_info); | |
3884 | } | |
3885 | ||
3886 | type_init(virtio_register_types) |