]>
Commit | Line | Data |
---|---|---|
967f97fa AL |
1 | /* |
2 | * Virtio Support | |
3 | * | |
4 | * Copyright IBM, Corp. 2007 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
9b8bfe21 | 14 | #include "qemu/osdep.h" |
da34e65c | 15 | #include "qapi/error.h" |
4771d756 | 16 | #include "cpu.h" |
64979a4d | 17 | #include "trace.h" |
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 | ||
d152cdd6 | 250 | e->flags = virtio_lduw_phys_cached(vdev, cache, off_flags); |
683f7665 JW |
251 | /* Make sure flags is seen before off_wrap */ |
252 | smp_rmb(); | |
d152cdd6 | 253 | e->off_wrap = virtio_lduw_phys_cached(vdev, cache, off_off); |
683f7665 JW |
254 | virtio_tswap16s(vdev, &e->flags); |
255 | } | |
256 | ||
257 | static void vring_packed_off_wrap_write(VirtIODevice *vdev, | |
258 | MemoryRegionCache *cache, | |
259 | uint16_t off_wrap) | |
260 | { | |
261 | hwaddr off = offsetof(VRingPackedDescEvent, off_wrap); | |
262 | ||
d152cdd6 | 263 | virtio_stw_phys_cached(vdev, cache, off, off_wrap); |
683f7665 JW |
264 | address_space_cache_invalidate(cache, off, sizeof(off_wrap)); |
265 | } | |
266 | ||
267 | static void vring_packed_flags_write(VirtIODevice *vdev, | |
268 | MemoryRegionCache *cache, uint16_t flags) | |
269 | { | |
270 | hwaddr off = offsetof(VRingPackedDescEvent, flags); | |
271 | ||
d152cdd6 | 272 | virtio_stw_phys_cached(vdev, cache, off, flags); |
683f7665 JW |
273 | address_space_cache_invalidate(cache, off, sizeof(flags)); |
274 | } | |
275 | ||
86044b24 | 276 | /* Called within rcu_read_lock(). */ |
e0e2d644 JW |
277 | static VRingMemoryRegionCaches *vring_get_region_caches(struct VirtQueue *vq) |
278 | { | |
d73415a3 | 279 | return qatomic_rcu_read(&vq->vring.caches); |
e0e2d644 | 280 | } |
abdd16f4 | 281 | |
97cd965c | 282 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
283 | static inline uint16_t vring_avail_flags(VirtQueue *vq) |
284 | { | |
e0e2d644 | 285 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 286 | hwaddr pa = offsetof(VRingAvail, flags); |
abdd16f4 SH |
287 | |
288 | if (!caches) { | |
289 | return 0; | |
290 | } | |
291 | ||
97cd965c | 292 | return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
967f97fa AL |
293 | } |
294 | ||
97cd965c | 295 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
296 | static inline uint16_t vring_avail_idx(VirtQueue *vq) |
297 | { | |
e0e2d644 | 298 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 299 | hwaddr pa = offsetof(VRingAvail, idx); |
abdd16f4 SH |
300 | |
301 | if (!caches) { | |
302 | return 0; | |
303 | } | |
304 | ||
97cd965c | 305 | vq->shadow_avail_idx = virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
be1fea9b | 306 | return vq->shadow_avail_idx; |
967f97fa AL |
307 | } |
308 | ||
97cd965c | 309 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
310 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
311 | { | |
e0e2d644 | 312 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 313 | hwaddr pa = offsetof(VRingAvail, ring[i]); |
abdd16f4 SH |
314 | |
315 | if (!caches) { | |
316 | return 0; | |
317 | } | |
318 | ||
97cd965c | 319 | return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
967f97fa AL |
320 | } |
321 | ||
97cd965c | 322 | /* Called within rcu_read_lock(). */ |
e9600c6c | 323 | static inline uint16_t vring_get_used_event(VirtQueue *vq) |
bcbabae8 MT |
324 | { |
325 | return vring_avail_ring(vq, vq->vring.num); | |
326 | } | |
327 | ||
97cd965c | 328 | /* Called within rcu_read_lock(). */ |
1cdd2ee5 VM |
329 | static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem, |
330 | int i) | |
967f97fa | 331 | { |
e0e2d644 | 332 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 333 | hwaddr pa = offsetof(VRingUsed, ring[i]); |
abdd16f4 SH |
334 | |
335 | if (!caches) { | |
336 | return; | |
337 | } | |
338 | ||
1cdd2ee5 VM |
339 | virtio_tswap32s(vq->vdev, &uelem->id); |
340 | virtio_tswap32s(vq->vdev, &uelem->len); | |
97cd965c PB |
341 | address_space_write_cached(&caches->used, pa, uelem, sizeof(VRingUsedElem)); |
342 | address_space_cache_invalidate(&caches->used, pa, sizeof(VRingUsedElem)); | |
967f97fa AL |
343 | } |
344 | ||
97cd965c | 345 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
346 | static uint16_t vring_used_idx(VirtQueue *vq) |
347 | { | |
e0e2d644 | 348 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 349 | hwaddr pa = offsetof(VRingUsed, idx); |
abdd16f4 SH |
350 | |
351 | if (!caches) { | |
352 | return 0; | |
353 | } | |
354 | ||
97cd965c | 355 | return virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); |
967f97fa AL |
356 | } |
357 | ||
97cd965c | 358 | /* Called within rcu_read_lock(). */ |
bcbabae8 | 359 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
967f97fa | 360 | { |
e0e2d644 | 361 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
97cd965c | 362 | hwaddr pa = offsetof(VRingUsed, idx); |
abdd16f4 SH |
363 | |
364 | if (caches) { | |
365 | virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); | |
366 | address_space_cache_invalidate(&caches->used, pa, sizeof(val)); | |
367 | } | |
368 | ||
b796fcd1 | 369 | vq->used_idx = val; |
967f97fa AL |
370 | } |
371 | ||
97cd965c | 372 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
373 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
374 | { | |
e0e2d644 | 375 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
cee3ca00 | 376 | VirtIODevice *vdev = vq->vdev; |
97cd965c | 377 | hwaddr pa = offsetof(VRingUsed, flags); |
abdd16f4 | 378 | uint16_t flags; |
97cd965c | 379 | |
abdd16f4 SH |
380 | if (!caches) { |
381 | return; | |
382 | } | |
383 | ||
384 | flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); | |
97cd965c PB |
385 | virtio_stw_phys_cached(vdev, &caches->used, pa, flags | mask); |
386 | address_space_cache_invalidate(&caches->used, pa, sizeof(flags)); | |
967f97fa AL |
387 | } |
388 | ||
97cd965c | 389 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
390 | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
391 | { | |
e0e2d644 | 392 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
cee3ca00 | 393 | VirtIODevice *vdev = vq->vdev; |
97cd965c | 394 | hwaddr pa = offsetof(VRingUsed, flags); |
abdd16f4 | 395 | uint16_t flags; |
97cd965c | 396 | |
abdd16f4 SH |
397 | if (!caches) { |
398 | return; | |
399 | } | |
400 | ||
401 | flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); | |
97cd965c PB |
402 | virtio_stw_phys_cached(vdev, &caches->used, pa, flags & ~mask); |
403 | address_space_cache_invalidate(&caches->used, pa, sizeof(flags)); | |
967f97fa AL |
404 | } |
405 | ||
97cd965c | 406 | /* Called within rcu_read_lock(). */ |
e9600c6c | 407 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) |
bcbabae8 | 408 | { |
97cd965c | 409 | VRingMemoryRegionCaches *caches; |
a8170e5e | 410 | hwaddr pa; |
332fa82d | 411 | if (!vq->notification) { |
bcbabae8 MT |
412 | return; |
413 | } | |
97cd965c | 414 | |
e0e2d644 | 415 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
416 | if (!caches) { |
417 | return; | |
418 | } | |
419 | ||
97cd965c PB |
420 | pa = offsetof(VRingUsed, ring[vq->vring.num]); |
421 | virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); | |
3cdf8473 | 422 | address_space_cache_invalidate(&caches->used, pa, sizeof(val)); |
bcbabae8 MT |
423 | } |
424 | ||
683f7665 | 425 | static void virtio_queue_split_set_notification(VirtQueue *vq, int enable) |
967f97fa | 426 | { |
b5f53d04 DDAG |
427 | RCU_READ_LOCK_GUARD(); |
428 | ||
95129d6f | 429 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 430 | vring_set_avail_event(vq, vring_avail_idx(vq)); |
bcbabae8 | 431 | } else if (enable) { |
967f97fa | 432 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 433 | } else { |
967f97fa | 434 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
bcbabae8 | 435 | } |
92045d80 MT |
436 | if (enable) { |
437 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
438 | smp_mb(); | |
439 | } | |
967f97fa AL |
440 | } |
441 | ||
683f7665 JW |
442 | static void virtio_queue_packed_set_notification(VirtQueue *vq, int enable) |
443 | { | |
444 | uint16_t off_wrap; | |
445 | VRingPackedDescEvent e; | |
446 | VRingMemoryRegionCaches *caches; | |
447 | ||
b5f53d04 | 448 | RCU_READ_LOCK_GUARD(); |
abdd16f4 SH |
449 | caches = vring_get_region_caches(vq); |
450 | if (!caches) { | |
451 | return; | |
452 | } | |
453 | ||
683f7665 JW |
454 | vring_packed_event_read(vq->vdev, &caches->used, &e); |
455 | ||
456 | if (!enable) { | |
457 | e.flags = VRING_PACKED_EVENT_FLAG_DISABLE; | |
458 | } else if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { | |
459 | off_wrap = vq->shadow_avail_idx | vq->shadow_avail_wrap_counter << 15; | |
460 | vring_packed_off_wrap_write(vq->vdev, &caches->used, off_wrap); | |
461 | /* Make sure off_wrap is wrote before flags */ | |
462 | smp_wmb(); | |
463 | e.flags = VRING_PACKED_EVENT_FLAG_DESC; | |
464 | } else { | |
465 | e.flags = VRING_PACKED_EVENT_FLAG_ENABLE; | |
466 | } | |
467 | ||
468 | vring_packed_flags_write(vq->vdev, &caches->used, e.flags); | |
469 | if (enable) { | |
470 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
471 | smp_mb(); | |
472 | } | |
683f7665 JW |
473 | } |
474 | ||
d0435bc5 SH |
475 | bool virtio_queue_get_notification(VirtQueue *vq) |
476 | { | |
477 | return vq->notification; | |
478 | } | |
479 | ||
683f7665 JW |
480 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
481 | { | |
482 | vq->notification = enable; | |
483 | ||
484 | if (!vq->vring.desc) { | |
485 | return; | |
486 | } | |
487 | ||
488 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
489 | virtio_queue_packed_set_notification(vq, enable); | |
490 | } else { | |
491 | virtio_queue_split_set_notification(vq, enable); | |
492 | } | |
493 | } | |
494 | ||
967f97fa AL |
495 | int virtio_queue_ready(VirtQueue *vq) |
496 | { | |
497 | return vq->vring.avail != 0; | |
498 | } | |
499 | ||
86044b24 JW |
500 | static void vring_packed_desc_read_flags(VirtIODevice *vdev, |
501 | uint16_t *flags, | |
502 | MemoryRegionCache *cache, | |
503 | int i) | |
504 | { | |
f463e761 JW |
505 | hwaddr off = i * sizeof(VRingPackedDesc) + offsetof(VRingPackedDesc, flags); |
506 | ||
507 | *flags = virtio_lduw_phys_cached(vdev, cache, off); | |
86044b24 JW |
508 | } |
509 | ||
510 | static void vring_packed_desc_read(VirtIODevice *vdev, | |
511 | VRingPackedDesc *desc, | |
512 | MemoryRegionCache *cache, | |
513 | int i, bool strict_order) | |
514 | { | |
515 | hwaddr off = i * sizeof(VRingPackedDesc); | |
516 | ||
517 | vring_packed_desc_read_flags(vdev, &desc->flags, cache, i); | |
518 | ||
519 | if (strict_order) { | |
520 | /* Make sure flags is read before the rest fields. */ | |
521 | smp_rmb(); | |
522 | } | |
523 | ||
524 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, addr), | |
525 | &desc->addr, sizeof(desc->addr)); | |
526 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, id), | |
527 | &desc->id, sizeof(desc->id)); | |
528 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, len), | |
529 | &desc->len, sizeof(desc->len)); | |
530 | virtio_tswap64s(vdev, &desc->addr); | |
531 | virtio_tswap16s(vdev, &desc->id); | |
532 | virtio_tswap32s(vdev, &desc->len); | |
533 | } | |
534 | ||
535 | static void vring_packed_desc_write_data(VirtIODevice *vdev, | |
536 | VRingPackedDesc *desc, | |
537 | MemoryRegionCache *cache, | |
538 | int i) | |
539 | { | |
540 | hwaddr off_id = i * sizeof(VRingPackedDesc) + | |
541 | offsetof(VRingPackedDesc, id); | |
542 | hwaddr off_len = i * sizeof(VRingPackedDesc) + | |
543 | offsetof(VRingPackedDesc, len); | |
544 | ||
545 | virtio_tswap32s(vdev, &desc->len); | |
546 | virtio_tswap16s(vdev, &desc->id); | |
547 | address_space_write_cached(cache, off_id, &desc->id, sizeof(desc->id)); | |
548 | address_space_cache_invalidate(cache, off_id, sizeof(desc->id)); | |
549 | address_space_write_cached(cache, off_len, &desc->len, sizeof(desc->len)); | |
550 | address_space_cache_invalidate(cache, off_len, sizeof(desc->len)); | |
551 | } | |
552 | ||
553 | static void vring_packed_desc_write_flags(VirtIODevice *vdev, | |
554 | VRingPackedDesc *desc, | |
555 | MemoryRegionCache *cache, | |
556 | int i) | |
557 | { | |
558 | hwaddr off = i * sizeof(VRingPackedDesc) + offsetof(VRingPackedDesc, flags); | |
559 | ||
f463e761 | 560 | virtio_stw_phys_cached(vdev, cache, off, desc->flags); |
86044b24 JW |
561 | address_space_cache_invalidate(cache, off, sizeof(desc->flags)); |
562 | } | |
563 | ||
564 | static void vring_packed_desc_write(VirtIODevice *vdev, | |
565 | VRingPackedDesc *desc, | |
566 | MemoryRegionCache *cache, | |
567 | int i, bool strict_order) | |
568 | { | |
569 | vring_packed_desc_write_data(vdev, desc, cache, i); | |
570 | if (strict_order) { | |
571 | /* Make sure data is wrote before flags. */ | |
572 | smp_wmb(); | |
573 | } | |
574 | vring_packed_desc_write_flags(vdev, desc, cache, i); | |
575 | } | |
576 | ||
577 | static inline bool is_desc_avail(uint16_t flags, bool wrap_counter) | |
578 | { | |
579 | bool avail, used; | |
580 | ||
581 | avail = !!(flags & (1 << VRING_PACKED_DESC_F_AVAIL)); | |
582 | used = !!(flags & (1 << VRING_PACKED_DESC_F_USED)); | |
583 | return (avail != used) && (avail == wrap_counter); | |
584 | } | |
585 | ||
be1fea9b | 586 | /* Fetch avail_idx from VQ memory only when we really need to know if |
97cd965c PB |
587 | * guest has added some buffers. |
588 | * Called within rcu_read_lock(). */ | |
589 | static int virtio_queue_empty_rcu(VirtQueue *vq) | |
967f97fa | 590 | { |
9d7bd082 | 591 | if (virtio_device_disabled(vq->vdev)) { |
2d1df859 FZ |
592 | return 1; |
593 | } | |
594 | ||
168e4af3 JW |
595 | if (unlikely(!vq->vring.avail)) { |
596 | return 1; | |
597 | } | |
598 | ||
be1fea9b VM |
599 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
600 | return 0; | |
601 | } | |
602 | ||
967f97fa AL |
603 | return vring_avail_idx(vq) == vq->last_avail_idx; |
604 | } | |
605 | ||
86044b24 | 606 | static int virtio_queue_split_empty(VirtQueue *vq) |
97cd965c PB |
607 | { |
608 | bool empty; | |
609 | ||
9d7bd082 | 610 | if (virtio_device_disabled(vq->vdev)) { |
2d1df859 FZ |
611 | return 1; |
612 | } | |
613 | ||
168e4af3 JW |
614 | if (unlikely(!vq->vring.avail)) { |
615 | return 1; | |
616 | } | |
617 | ||
97cd965c PB |
618 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
619 | return 0; | |
620 | } | |
621 | ||
b5f53d04 | 622 | RCU_READ_LOCK_GUARD(); |
97cd965c | 623 | empty = vring_avail_idx(vq) == vq->last_avail_idx; |
97cd965c PB |
624 | return empty; |
625 | } | |
626 | ||
7f51bedd | 627 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
628 | static int virtio_queue_packed_empty_rcu(VirtQueue *vq) |
629 | { | |
630 | struct VRingPackedDesc desc; | |
631 | VRingMemoryRegionCaches *cache; | |
632 | ||
633 | if (unlikely(!vq->vring.desc)) { | |
634 | return 1; | |
635 | } | |
636 | ||
637 | cache = vring_get_region_caches(vq); | |
abdd16f4 SH |
638 | if (!cache) { |
639 | return 1; | |
640 | } | |
641 | ||
86044b24 JW |
642 | vring_packed_desc_read_flags(vq->vdev, &desc.flags, &cache->desc, |
643 | vq->last_avail_idx); | |
644 | ||
645 | return !is_desc_avail(desc.flags, vq->last_avail_wrap_counter); | |
646 | } | |
647 | ||
648 | static int virtio_queue_packed_empty(VirtQueue *vq) | |
649 | { | |
b5f53d04 DDAG |
650 | RCU_READ_LOCK_GUARD(); |
651 | return virtio_queue_packed_empty_rcu(vq); | |
86044b24 JW |
652 | } |
653 | ||
654 | int virtio_queue_empty(VirtQueue *vq) | |
655 | { | |
656 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
657 | return virtio_queue_packed_empty(vq); | |
658 | } else { | |
659 | return virtio_queue_split_empty(vq); | |
660 | } | |
661 | } | |
662 | ||
ce317461 JW |
663 | static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, |
664 | unsigned int len) | |
967f97fa | 665 | { |
8607f5c3 | 666 | AddressSpace *dma_as = vq->vdev->dma_as; |
967f97fa AL |
667 | unsigned int offset; |
668 | int i; | |
669 | ||
967f97fa AL |
670 | offset = 0; |
671 | for (i = 0; i < elem->in_num; i++) { | |
672 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); | |
673 | ||
8607f5c3 JW |
674 | dma_memory_unmap(dma_as, elem->in_sg[i].iov_base, |
675 | elem->in_sg[i].iov_len, | |
676 | DMA_DIRECTION_FROM_DEVICE, size); | |
967f97fa | 677 | |
0cea71a2 | 678 | offset += size; |
967f97fa AL |
679 | } |
680 | ||
26b258e1 | 681 | for (i = 0; i < elem->out_num; i++) |
8607f5c3 JW |
682 | dma_memory_unmap(dma_as, elem->out_sg[i].iov_base, |
683 | elem->out_sg[i].iov_len, | |
684 | DMA_DIRECTION_TO_DEVICE, | |
685 | elem->out_sg[i].iov_len); | |
ce317461 JW |
686 | } |
687 | ||
2640d2a5 SH |
688 | /* virtqueue_detach_element: |
689 | * @vq: The #VirtQueue | |
690 | * @elem: The #VirtQueueElement | |
691 | * @len: number of bytes written | |
692 | * | |
693 | * Detach the element from the virtqueue. This function is suitable for device | |
694 | * reset or other situations where a #VirtQueueElement is simply freed and will | |
695 | * not be pushed or discarded. | |
696 | */ | |
697 | void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem, | |
698 | unsigned int len) | |
699 | { | |
86044b24 | 700 | vq->inuse -= elem->ndescs; |
2640d2a5 SH |
701 | virtqueue_unmap_sg(vq, elem, len); |
702 | } | |
703 | ||
86044b24 JW |
704 | static void virtqueue_split_rewind(VirtQueue *vq, unsigned int num) |
705 | { | |
706 | vq->last_avail_idx -= num; | |
707 | } | |
708 | ||
709 | static void virtqueue_packed_rewind(VirtQueue *vq, unsigned int num) | |
710 | { | |
711 | if (vq->last_avail_idx < num) { | |
712 | vq->last_avail_idx = vq->vring.num + vq->last_avail_idx - num; | |
713 | vq->last_avail_wrap_counter ^= 1; | |
714 | } else { | |
715 | vq->last_avail_idx -= num; | |
716 | } | |
717 | } | |
718 | ||
27e57efe | 719 | /* virtqueue_unpop: |
2640d2a5 SH |
720 | * @vq: The #VirtQueue |
721 | * @elem: The #VirtQueueElement | |
722 | * @len: number of bytes written | |
723 | * | |
724 | * Pretend the most recent element wasn't popped from the virtqueue. The next | |
725 | * call to virtqueue_pop() will refetch the element. | |
726 | */ | |
27e57efe LP |
727 | void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem, |
728 | unsigned int len) | |
29b9f5ef | 729 | { |
86044b24 JW |
730 | |
731 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
732 | virtqueue_packed_rewind(vq, 1); | |
733 | } else { | |
734 | virtqueue_split_rewind(vq, 1); | |
735 | } | |
736 | ||
2640d2a5 | 737 | virtqueue_detach_element(vq, elem, len); |
29b9f5ef JW |
738 | } |
739 | ||
297a75e6 SH |
740 | /* virtqueue_rewind: |
741 | * @vq: The #VirtQueue | |
742 | * @num: Number of elements to push back | |
743 | * | |
744 | * Pretend that elements weren't popped from the virtqueue. The next | |
745 | * virtqueue_pop() will refetch the oldest element. | |
746 | * | |
27e57efe | 747 | * Use virtqueue_unpop() instead if you have a VirtQueueElement. |
297a75e6 SH |
748 | * |
749 | * Returns: true on success, false if @num is greater than the number of in use | |
750 | * elements. | |
751 | */ | |
752 | bool virtqueue_rewind(VirtQueue *vq, unsigned int num) | |
753 | { | |
754 | if (num > vq->inuse) { | |
755 | return false; | |
756 | } | |
86044b24 | 757 | |
297a75e6 | 758 | vq->inuse -= num; |
86044b24 JW |
759 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
760 | virtqueue_packed_rewind(vq, num); | |
761 | } else { | |
762 | virtqueue_split_rewind(vq, num); | |
763 | } | |
297a75e6 SH |
764 | return true; |
765 | } | |
766 | ||
86044b24 | 767 | static void virtqueue_split_fill(VirtQueue *vq, const VirtQueueElement *elem, |
ce317461 JW |
768 | unsigned int len, unsigned int idx) |
769 | { | |
1cdd2ee5 VM |
770 | VRingUsedElem uelem; |
771 | ||
168e4af3 JW |
772 | if (unlikely(!vq->vring.used)) { |
773 | return; | |
774 | } | |
775 | ||
b796fcd1 | 776 | idx = (idx + vq->used_idx) % vq->vring.num; |
967f97fa | 777 | |
1cdd2ee5 VM |
778 | uelem.id = elem->index; |
779 | uelem.len = len; | |
780 | vring_used_write(vq, &uelem, idx); | |
967f97fa AL |
781 | } |
782 | ||
86044b24 JW |
783 | static void virtqueue_packed_fill(VirtQueue *vq, const VirtQueueElement *elem, |
784 | unsigned int len, unsigned int idx) | |
785 | { | |
786 | vq->used_elems[idx].index = elem->index; | |
787 | vq->used_elems[idx].len = len; | |
788 | vq->used_elems[idx].ndescs = elem->ndescs; | |
789 | } | |
790 | ||
791 | static void virtqueue_packed_fill_desc(VirtQueue *vq, | |
792 | const VirtQueueElement *elem, | |
793 | unsigned int idx, | |
794 | bool strict_order) | |
795 | { | |
796 | uint16_t head; | |
797 | VRingMemoryRegionCaches *caches; | |
798 | VRingPackedDesc desc = { | |
799 | .id = elem->index, | |
800 | .len = elem->len, | |
801 | }; | |
802 | bool wrap_counter = vq->used_wrap_counter; | |
803 | ||
804 | if (unlikely(!vq->vring.desc)) { | |
805 | return; | |
806 | } | |
807 | ||
808 | head = vq->used_idx + idx; | |
809 | if (head >= vq->vring.num) { | |
810 | head -= vq->vring.num; | |
811 | wrap_counter ^= 1; | |
812 | } | |
813 | if (wrap_counter) { | |
814 | desc.flags |= (1 << VRING_PACKED_DESC_F_AVAIL); | |
815 | desc.flags |= (1 << VRING_PACKED_DESC_F_USED); | |
816 | } else { | |
817 | desc.flags &= ~(1 << VRING_PACKED_DESC_F_AVAIL); | |
818 | desc.flags &= ~(1 << VRING_PACKED_DESC_F_USED); | |
819 | } | |
820 | ||
821 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
822 | if (!caches) { |
823 | return; | |
824 | } | |
825 | ||
86044b24 JW |
826 | vring_packed_desc_write(vq->vdev, &desc, &caches->desc, head, strict_order); |
827 | } | |
828 | ||
97cd965c | 829 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
830 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
831 | unsigned int len, unsigned int idx) | |
967f97fa | 832 | { |
86044b24 JW |
833 | trace_virtqueue_fill(vq, elem, len, idx); |
834 | ||
835 | virtqueue_unmap_sg(vq, elem, len); | |
f5ed3663 | 836 | |
9d7bd082 | 837 | if (virtio_device_disabled(vq->vdev)) { |
f5ed3663 SH |
838 | return; |
839 | } | |
840 | ||
86044b24 JW |
841 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
842 | virtqueue_packed_fill(vq, elem, len, idx); | |
843 | } else { | |
844 | virtqueue_split_fill(vq, elem, len, idx); | |
845 | } | |
846 | } | |
847 | ||
848 | /* Called within rcu_read_lock(). */ | |
849 | static void virtqueue_split_flush(VirtQueue *vq, unsigned int count) | |
850 | { | |
851 | uint16_t old, new; | |
852 | ||
168e4af3 JW |
853 | if (unlikely(!vq->vring.used)) { |
854 | return; | |
855 | } | |
856 | ||
967f97fa | 857 | /* Make sure buffer is written before we update index. */ |
b90d2f35 | 858 | smp_wmb(); |
64979a4d | 859 | trace_virtqueue_flush(vq, count); |
b796fcd1 | 860 | old = vq->used_idx; |
bcbabae8 MT |
861 | new = old + count; |
862 | vring_used_idx_set(vq, new); | |
967f97fa | 863 | vq->inuse -= count; |
bcbabae8 MT |
864 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) |
865 | vq->signalled_used_valid = false; | |
967f97fa AL |
866 | } |
867 | ||
86044b24 JW |
868 | static void virtqueue_packed_flush(VirtQueue *vq, unsigned int count) |
869 | { | |
870 | unsigned int i, ndescs = 0; | |
871 | ||
872 | if (unlikely(!vq->vring.desc)) { | |
873 | return; | |
874 | } | |
875 | ||
876 | for (i = 1; i < count; i++) { | |
877 | virtqueue_packed_fill_desc(vq, &vq->used_elems[i], i, false); | |
878 | ndescs += vq->used_elems[i].ndescs; | |
879 | } | |
880 | virtqueue_packed_fill_desc(vq, &vq->used_elems[0], 0, true); | |
881 | ndescs += vq->used_elems[0].ndescs; | |
882 | ||
883 | vq->inuse -= ndescs; | |
884 | vq->used_idx += ndescs; | |
885 | if (vq->used_idx >= vq->vring.num) { | |
886 | vq->used_idx -= vq->vring.num; | |
887 | vq->used_wrap_counter ^= 1; | |
888 | } | |
889 | } | |
890 | ||
891 | void virtqueue_flush(VirtQueue *vq, unsigned int count) | |
892 | { | |
9d7bd082 | 893 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
894 | vq->inuse -= count; |
895 | return; | |
896 | } | |
897 | ||
898 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
899 | virtqueue_packed_flush(vq, count); | |
900 | } else { | |
901 | virtqueue_split_flush(vq, count); | |
902 | } | |
903 | } | |
904 | ||
967f97fa AL |
905 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
906 | unsigned int len) | |
907 | { | |
b5f53d04 | 908 | RCU_READ_LOCK_GUARD(); |
967f97fa AL |
909 | virtqueue_fill(vq, elem, len, 0); |
910 | virtqueue_flush(vq, 1); | |
911 | } | |
912 | ||
97cd965c | 913 | /* Called within rcu_read_lock(). */ |
967f97fa AL |
914 | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
915 | { | |
916 | uint16_t num_heads = vring_avail_idx(vq) - idx; | |
917 | ||
918 | /* Check it isn't doing very strange things with descriptor numbers. */ | |
bb6834cf | 919 | if (num_heads > vq->vring.num) { |
4355c1ab | 920 | virtio_error(vq->vdev, "Guest moved used index from %u to %u", |
be1fea9b | 921 | idx, vq->shadow_avail_idx); |
4355c1ab | 922 | return -EINVAL; |
bb6834cf | 923 | } |
a821ce59 MT |
924 | /* On success, callers read a descriptor at vq->last_avail_idx. |
925 | * Make sure descriptor read does not bypass avail index read. */ | |
926 | if (num_heads) { | |
927 | smp_rmb(); | |
928 | } | |
967f97fa AL |
929 | |
930 | return num_heads; | |
931 | } | |
932 | ||
97cd965c | 933 | /* Called within rcu_read_lock(). */ |
fb1131b6 SH |
934 | static bool virtqueue_get_head(VirtQueue *vq, unsigned int idx, |
935 | unsigned int *head) | |
967f97fa | 936 | { |
967f97fa AL |
937 | /* Grab the next descriptor number they're advertising, and increment |
938 | * the index we've seen. */ | |
fb1131b6 | 939 | *head = vring_avail_ring(vq, idx % vq->vring.num); |
967f97fa AL |
940 | |
941 | /* If their number is silly, that's a fatal mistake. */ | |
fb1131b6 SH |
942 | if (*head >= vq->vring.num) { |
943 | virtio_error(vq->vdev, "Guest says index %u is available", *head); | |
944 | return false; | |
bb6834cf | 945 | } |
967f97fa | 946 | |
fb1131b6 | 947 | return true; |
967f97fa AL |
948 | } |
949 | ||
412e0e81 SH |
950 | enum { |
951 | VIRTQUEUE_READ_DESC_ERROR = -1, | |
952 | VIRTQUEUE_READ_DESC_DONE = 0, /* end of chain */ | |
953 | VIRTQUEUE_READ_DESC_MORE = 1, /* more buffers in chain */ | |
954 | }; | |
967f97fa | 955 | |
86044b24 JW |
956 | static int virtqueue_split_read_next_desc(VirtIODevice *vdev, VRingDesc *desc, |
957 | MemoryRegionCache *desc_cache, | |
958 | unsigned int max, unsigned int *next) | |
412e0e81 | 959 | { |
967f97fa | 960 | /* If this descriptor says it doesn't chain, we're done. */ |
aa570d6f | 961 | if (!(desc->flags & VRING_DESC_F_NEXT)) { |
412e0e81 | 962 | return VIRTQUEUE_READ_DESC_DONE; |
cee3ca00 | 963 | } |
967f97fa AL |
964 | |
965 | /* Check they're not leading us off end of descriptors. */ | |
412e0e81 | 966 | *next = desc->next; |
967f97fa | 967 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
b90d2f35 | 968 | smp_wmb(); |
967f97fa | 969 | |
412e0e81 SH |
970 | if (*next >= max) { |
971 | virtio_error(vdev, "Desc next is %u", *next); | |
972 | return VIRTQUEUE_READ_DESC_ERROR; | |
bb6834cf | 973 | } |
967f97fa | 974 | |
86044b24 | 975 | vring_split_desc_read(vdev, desc, desc_cache, *next); |
412e0e81 | 976 | return VIRTQUEUE_READ_DESC_MORE; |
967f97fa AL |
977 | } |
978 | ||
d6ed27ba | 979 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
980 | static void virtqueue_split_get_avail_bytes(VirtQueue *vq, |
981 | unsigned int *in_bytes, unsigned int *out_bytes, | |
d6ed27ba PMD |
982 | unsigned max_in_bytes, unsigned max_out_bytes, |
983 | VRingMemoryRegionCaches *caches) | |
967f97fa | 984 | { |
9796d0ac PB |
985 | VirtIODevice *vdev = vq->vdev; |
986 | unsigned int max, idx; | |
385ce95d | 987 | unsigned int total_bufs, in_total, out_total; |
5eba0404 PB |
988 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
989 | int64_t len = 0; | |
412e0e81 | 990 | int rc; |
967f97fa AL |
991 | |
992 | idx = vq->last_avail_idx; | |
efeea6d0 | 993 | total_bufs = in_total = out_total = 0; |
9796d0ac PB |
994 | |
995 | max = vq->vring.num; | |
abdd16f4 | 996 | |
4355c1ab | 997 | while ((rc = virtqueue_num_heads(vq, idx)) > 0) { |
991976f7 | 998 | MemoryRegionCache *desc_cache = &caches->desc; |
9796d0ac | 999 | unsigned int num_bufs; |
aa570d6f | 1000 | VRingDesc desc; |
b1c7c07f | 1001 | unsigned int i; |
967f97fa | 1002 | |
efeea6d0 | 1003 | num_bufs = total_bufs; |
fb1131b6 SH |
1004 | |
1005 | if (!virtqueue_get_head(vq, idx++, &i)) { | |
1006 | goto err; | |
1007 | } | |
1008 | ||
86044b24 | 1009 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 | 1010 | |
aa570d6f | 1011 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
74231929 | 1012 | if (!desc.len || (desc.len % sizeof(VRingDesc))) { |
d65abf85 SH |
1013 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
1014 | goto err; | |
efeea6d0 MM |
1015 | } |
1016 | ||
1017 | /* If we've got too many, that implies a descriptor loop. */ | |
1018 | if (num_bufs >= max) { | |
d65abf85 SH |
1019 | virtio_error(vdev, "Looped descriptor"); |
1020 | goto err; | |
efeea6d0 MM |
1021 | } |
1022 | ||
1023 | /* loop over the indirect descriptor table */ | |
5eba0404 PB |
1024 | len = address_space_cache_init(&indirect_desc_cache, |
1025 | vdev->dma_as, | |
1026 | desc.addr, desc.len, false); | |
1027 | desc_cache = &indirect_desc_cache; | |
9796d0ac PB |
1028 | if (len < desc.len) { |
1029 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1030 | goto err; | |
1031 | } | |
1032 | ||
aa570d6f | 1033 | max = desc.len / sizeof(VRingDesc); |
1ae2757c | 1034 | num_bufs = i = 0; |
86044b24 | 1035 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 MM |
1036 | } |
1037 | ||
967f97fa AL |
1038 | do { |
1039 | /* If we've got too many, that implies a descriptor loop. */ | |
5774cf98 | 1040 | if (++num_bufs > max) { |
d65abf85 SH |
1041 | virtio_error(vdev, "Looped descriptor"); |
1042 | goto err; | |
bb6834cf | 1043 | } |
967f97fa | 1044 | |
aa570d6f PB |
1045 | if (desc.flags & VRING_DESC_F_WRITE) { |
1046 | in_total += desc.len; | |
967f97fa | 1047 | } else { |
aa570d6f | 1048 | out_total += desc.len; |
967f97fa | 1049 | } |
e1f7b481 MT |
1050 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
1051 | goto done; | |
1052 | } | |
412e0e81 | 1053 | |
86044b24 | 1054 | rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, max, &i); |
412e0e81 SH |
1055 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
1056 | ||
1057 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { | |
1058 | goto err; | |
1059 | } | |
efeea6d0 | 1060 | |
5eba0404 PB |
1061 | if (desc_cache == &indirect_desc_cache) { |
1062 | address_space_cache_destroy(&indirect_desc_cache); | |
efeea6d0 | 1063 | total_bufs++; |
9796d0ac PB |
1064 | } else { |
1065 | total_bufs = num_bufs; | |
1066 | } | |
967f97fa | 1067 | } |
4355c1ab SH |
1068 | |
1069 | if (rc < 0) { | |
1070 | goto err; | |
1071 | } | |
1072 | ||
e1f7b481 | 1073 | done: |
5eba0404 | 1074 | address_space_cache_destroy(&indirect_desc_cache); |
0d8d7690 | 1075 | if (in_bytes) { |
86044b24 JW |
1076 | *in_bytes = in_total; |
1077 | } | |
1078 | if (out_bytes) { | |
1079 | *out_bytes = out_total; | |
1080 | } | |
86044b24 JW |
1081 | return; |
1082 | ||
1083 | err: | |
1084 | in_total = out_total = 0; | |
1085 | goto done; | |
1086 | } | |
1087 | ||
1088 | static int virtqueue_packed_read_next_desc(VirtQueue *vq, | |
1089 | VRingPackedDesc *desc, | |
1090 | MemoryRegionCache | |
1091 | *desc_cache, | |
1092 | unsigned int max, | |
1093 | unsigned int *next, | |
1094 | bool indirect) | |
1095 | { | |
1096 | /* If this descriptor says it doesn't chain, we're done. */ | |
1097 | if (!indirect && !(desc->flags & VRING_DESC_F_NEXT)) { | |
1098 | return VIRTQUEUE_READ_DESC_DONE; | |
1099 | } | |
1100 | ||
1101 | ++*next; | |
1102 | if (*next == max) { | |
1103 | if (indirect) { | |
1104 | return VIRTQUEUE_READ_DESC_DONE; | |
1105 | } else { | |
1106 | (*next) -= vq->vring.num; | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | vring_packed_desc_read(vq->vdev, desc, desc_cache, *next, false); | |
1111 | return VIRTQUEUE_READ_DESC_MORE; | |
1112 | } | |
1113 | ||
d6ed27ba | 1114 | /* Called within rcu_read_lock(). */ |
86044b24 JW |
1115 | static void virtqueue_packed_get_avail_bytes(VirtQueue *vq, |
1116 | unsigned int *in_bytes, | |
1117 | unsigned int *out_bytes, | |
1118 | unsigned max_in_bytes, | |
d6ed27ba PMD |
1119 | unsigned max_out_bytes, |
1120 | VRingMemoryRegionCaches *caches) | |
86044b24 JW |
1121 | { |
1122 | VirtIODevice *vdev = vq->vdev; | |
1123 | unsigned int max, idx; | |
1124 | unsigned int total_bufs, in_total, out_total; | |
1125 | MemoryRegionCache *desc_cache; | |
86044b24 JW |
1126 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
1127 | int64_t len = 0; | |
1128 | VRingPackedDesc desc; | |
1129 | bool wrap_counter; | |
1130 | ||
86044b24 JW |
1131 | idx = vq->last_avail_idx; |
1132 | wrap_counter = vq->last_avail_wrap_counter; | |
1133 | total_bufs = in_total = out_total = 0; | |
1134 | ||
1135 | max = vq->vring.num; | |
86044b24 JW |
1136 | |
1137 | for (;;) { | |
1138 | unsigned int num_bufs = total_bufs; | |
1139 | unsigned int i = idx; | |
1140 | int rc; | |
1141 | ||
1142 | desc_cache = &caches->desc; | |
1143 | vring_packed_desc_read(vdev, &desc, desc_cache, idx, true); | |
1144 | if (!is_desc_avail(desc.flags, wrap_counter)) { | |
1145 | break; | |
1146 | } | |
1147 | ||
1148 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
1149 | if (desc.len % sizeof(VRingPackedDesc)) { | |
1150 | virtio_error(vdev, "Invalid size for indirect buffer table"); | |
1151 | goto err; | |
1152 | } | |
1153 | ||
1154 | /* If we've got too many, that implies a descriptor loop. */ | |
1155 | if (num_bufs >= max) { | |
1156 | virtio_error(vdev, "Looped descriptor"); | |
1157 | goto err; | |
1158 | } | |
1159 | ||
1160 | /* loop over the indirect descriptor table */ | |
1161 | len = address_space_cache_init(&indirect_desc_cache, | |
1162 | vdev->dma_as, | |
1163 | desc.addr, desc.len, false); | |
1164 | desc_cache = &indirect_desc_cache; | |
1165 | if (len < desc.len) { | |
1166 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1167 | goto err; | |
1168 | } | |
1169 | ||
1170 | max = desc.len / sizeof(VRingPackedDesc); | |
1171 | num_bufs = i = 0; | |
1172 | vring_packed_desc_read(vdev, &desc, desc_cache, i, false); | |
1173 | } | |
1174 | ||
1175 | do { | |
1176 | /* If we've got too many, that implies a descriptor loop. */ | |
1177 | if (++num_bufs > max) { | |
1178 | virtio_error(vdev, "Looped descriptor"); | |
1179 | goto err; | |
1180 | } | |
1181 | ||
1182 | if (desc.flags & VRING_DESC_F_WRITE) { | |
1183 | in_total += desc.len; | |
1184 | } else { | |
1185 | out_total += desc.len; | |
1186 | } | |
1187 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { | |
1188 | goto done; | |
1189 | } | |
1190 | ||
1191 | rc = virtqueue_packed_read_next_desc(vq, &desc, desc_cache, max, | |
1192 | &i, desc_cache == | |
1193 | &indirect_desc_cache); | |
1194 | } while (rc == VIRTQUEUE_READ_DESC_MORE); | |
1195 | ||
1196 | if (desc_cache == &indirect_desc_cache) { | |
1197 | address_space_cache_destroy(&indirect_desc_cache); | |
1198 | total_bufs++; | |
1199 | idx++; | |
1200 | } else { | |
1201 | idx += num_bufs - total_bufs; | |
1202 | total_bufs = num_bufs; | |
1203 | } | |
1204 | ||
1205 | if (idx >= vq->vring.num) { | |
1206 | idx -= vq->vring.num; | |
1207 | wrap_counter ^= 1; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | /* Record the index and wrap counter for a kick we want */ | |
1212 | vq->shadow_avail_idx = idx; | |
1213 | vq->shadow_avail_wrap_counter = wrap_counter; | |
1214 | done: | |
1215 | address_space_cache_destroy(&indirect_desc_cache); | |
1216 | if (in_bytes) { | |
1217 | *in_bytes = in_total; | |
1218 | } | |
1219 | if (out_bytes) { | |
1220 | *out_bytes = out_total; | |
1221 | } | |
86044b24 JW |
1222 | return; |
1223 | ||
1224 | err: | |
1225 | in_total = out_total = 0; | |
1226 | goto done; | |
1227 | } | |
1228 | ||
1229 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, | |
1230 | unsigned int *out_bytes, | |
1231 | unsigned max_in_bytes, unsigned max_out_bytes) | |
1232 | { | |
1233 | uint16_t desc_size; | |
1234 | VRingMemoryRegionCaches *caches; | |
1235 | ||
d6ed27ba PMD |
1236 | RCU_READ_LOCK_GUARD(); |
1237 | ||
86044b24 JW |
1238 | if (unlikely(!vq->vring.desc)) { |
1239 | goto err; | |
1240 | } | |
1241 | ||
1242 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
1243 | if (!caches) { |
1244 | goto err; | |
1245 | } | |
1246 | ||
86044b24 JW |
1247 | desc_size = virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED) ? |
1248 | sizeof(VRingPackedDesc) : sizeof(VRingDesc); | |
1249 | if (caches->desc.len < vq->vring.num * desc_size) { | |
1250 | virtio_error(vq->vdev, "Cannot map descriptor ring"); | |
1251 | goto err; | |
1252 | } | |
1253 | ||
1254 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
1255 | virtqueue_packed_get_avail_bytes(vq, in_bytes, out_bytes, | |
d6ed27ba PMD |
1256 | max_in_bytes, max_out_bytes, |
1257 | caches); | |
86044b24 JW |
1258 | } else { |
1259 | virtqueue_split_get_avail_bytes(vq, in_bytes, out_bytes, | |
d6ed27ba PMD |
1260 | max_in_bytes, max_out_bytes, |
1261 | caches); | |
86044b24 JW |
1262 | } |
1263 | ||
1264 | return; | |
1265 | err: | |
1266 | if (in_bytes) { | |
1267 | *in_bytes = 0; | |
0d8d7690 AS |
1268 | } |
1269 | if (out_bytes) { | |
86044b24 | 1270 | *out_bytes = 0; |
0d8d7690 AS |
1271 | } |
1272 | } | |
967f97fa | 1273 | |
0d8d7690 AS |
1274 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
1275 | unsigned int out_bytes) | |
1276 | { | |
1277 | unsigned int in_total, out_total; | |
1278 | ||
e1f7b481 MT |
1279 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); |
1280 | return in_bytes <= in_total && out_bytes <= out_total; | |
967f97fa AL |
1281 | } |
1282 | ||
ec55da19 SH |
1283 | static bool virtqueue_map_desc(VirtIODevice *vdev, unsigned int *p_num_sg, |
1284 | hwaddr *addr, struct iovec *iov, | |
3b3b0628 PB |
1285 | unsigned int max_num_sg, bool is_write, |
1286 | hwaddr pa, size_t sz) | |
1287 | { | |
ec55da19 | 1288 | bool ok = false; |
3b3b0628 PB |
1289 | unsigned num_sg = *p_num_sg; |
1290 | assert(num_sg <= max_num_sg); | |
1291 | ||
1e7aed70 | 1292 | if (!sz) { |
ec55da19 SH |
1293 | virtio_error(vdev, "virtio: zero sized buffers are not allowed"); |
1294 | goto out; | |
1e7aed70 PP |
1295 | } |
1296 | ||
3b3b0628 PB |
1297 | while (sz) { |
1298 | hwaddr len = sz; | |
1299 | ||
1300 | if (num_sg == max_num_sg) { | |
ec55da19 SH |
1301 | virtio_error(vdev, "virtio: too many write descriptors in " |
1302 | "indirect table"); | |
1303 | goto out; | |
3b3b0628 PB |
1304 | } |
1305 | ||
8607f5c3 JW |
1306 | iov[num_sg].iov_base = dma_memory_map(vdev->dma_as, pa, &len, |
1307 | is_write ? | |
1308 | DMA_DIRECTION_FROM_DEVICE : | |
1309 | DMA_DIRECTION_TO_DEVICE); | |
973e7170 | 1310 | if (!iov[num_sg].iov_base) { |
ec55da19 SH |
1311 | virtio_error(vdev, "virtio: bogus descriptor or out of resources"); |
1312 | goto out; | |
973e7170 PP |
1313 | } |
1314 | ||
3b3b0628 PB |
1315 | iov[num_sg].iov_len = len; |
1316 | addr[num_sg] = pa; | |
1317 | ||
1318 | sz -= len; | |
1319 | pa += len; | |
1320 | num_sg++; | |
1321 | } | |
ec55da19 SH |
1322 | ok = true; |
1323 | ||
1324 | out: | |
3b3b0628 | 1325 | *p_num_sg = num_sg; |
ec55da19 SH |
1326 | return ok; |
1327 | } | |
1328 | ||
1329 | /* Only used by error code paths before we have a VirtQueueElement (therefore | |
1330 | * virtqueue_unmap_sg() can't be used). Assumes buffers weren't written to | |
1331 | * yet. | |
1332 | */ | |
1333 | static void virtqueue_undo_map_desc(unsigned int out_num, unsigned int in_num, | |
1334 | struct iovec *iov) | |
1335 | { | |
1336 | unsigned int i; | |
1337 | ||
1338 | for (i = 0; i < out_num + in_num; i++) { | |
1339 | int is_write = i >= out_num; | |
1340 | ||
1341 | cpu_physical_memory_unmap(iov->iov_base, iov->iov_len, is_write, 0); | |
1342 | iov++; | |
1343 | } | |
3b3b0628 PB |
1344 | } |
1345 | ||
8607f5c3 | 1346 | static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg, |
e4fbf5b2 | 1347 | hwaddr *addr, unsigned int num_sg, |
22953364 | 1348 | bool is_write) |
42fb2e07 KW |
1349 | { |
1350 | unsigned int i; | |
a8170e5e | 1351 | hwaddr len; |
42fb2e07 | 1352 | |
e4fbf5b2 | 1353 | for (i = 0; i < num_sg; i++) { |
42fb2e07 | 1354 | len = sg[i].iov_len; |
8607f5c3 JW |
1355 | sg[i].iov_base = dma_memory_map(vdev->dma_as, |
1356 | addr[i], &len, is_write ? | |
1357 | DMA_DIRECTION_FROM_DEVICE : | |
1358 | DMA_DIRECTION_TO_DEVICE); | |
8059feee | 1359 | if (!sg[i].iov_base) { |
1a285899 | 1360 | error_report("virtio: error trying to map MMIO memory"); |
42fb2e07 KW |
1361 | exit(1); |
1362 | } | |
3b3b0628 PB |
1363 | if (len != sg[i].iov_len) { |
1364 | error_report("virtio: unexpected memory split"); | |
8059feee MT |
1365 | exit(1); |
1366 | } | |
42fb2e07 KW |
1367 | } |
1368 | } | |
1369 | ||
8607f5c3 | 1370 | void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem) |
8059feee | 1371 | { |
22953364 PMD |
1372 | virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, elem->in_num, true); |
1373 | virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, elem->out_num, | |
1374 | false); | |
3724650d PB |
1375 | } |
1376 | ||
bf91bd27 | 1377 | static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num) |
3724650d PB |
1378 | { |
1379 | VirtQueueElement *elem; | |
1380 | size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0])); | |
1381 | size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]); | |
1382 | size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]); | |
1383 | size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0])); | |
1384 | size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); | |
1385 | size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); | |
1386 | ||
1387 | assert(sz >= sizeof(VirtQueueElement)); | |
1388 | elem = g_malloc(out_sg_end); | |
b0ac429f | 1389 | trace_virtqueue_alloc_element(elem, sz, in_num, out_num); |
3724650d PB |
1390 | elem->out_num = out_num; |
1391 | elem->in_num = in_num; | |
1392 | elem->in_addr = (void *)elem + in_addr_ofs; | |
1393 | elem->out_addr = (void *)elem + out_addr_ofs; | |
1394 | elem->in_sg = (void *)elem + in_sg_ofs; | |
1395 | elem->out_sg = (void *)elem + out_sg_ofs; | |
1396 | return elem; | |
8059feee MT |
1397 | } |
1398 | ||
86044b24 | 1399 | static void *virtqueue_split_pop(VirtQueue *vq, size_t sz) |
967f97fa | 1400 | { |
5774cf98 | 1401 | unsigned int i, head, max; |
991976f7 | 1402 | VRingMemoryRegionCaches *caches; |
5eba0404 PB |
1403 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
1404 | MemoryRegionCache *desc_cache; | |
1405 | int64_t len; | |
cee3ca00 | 1406 | VirtIODevice *vdev = vq->vdev; |
9796d0ac | 1407 | VirtQueueElement *elem = NULL; |
37ef70be | 1408 | unsigned out_num, in_num, elem_entries; |
3b3b0628 PB |
1409 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; |
1410 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
aa570d6f | 1411 | VRingDesc desc; |
412e0e81 | 1412 | int rc; |
967f97fa | 1413 | |
b5f53d04 | 1414 | RCU_READ_LOCK_GUARD(); |
97cd965c PB |
1415 | if (virtio_queue_empty_rcu(vq)) { |
1416 | goto done; | |
51b19ebe | 1417 | } |
be1fea9b VM |
1418 | /* Needed after virtio_queue_empty(), see comment in |
1419 | * virtqueue_num_heads(). */ | |
1420 | smp_rmb(); | |
967f97fa AL |
1421 | |
1422 | /* When we start there are none of either input nor output. */ | |
37ef70be | 1423 | out_num = in_num = elem_entries = 0; |
967f97fa | 1424 | |
5774cf98 MM |
1425 | max = vq->vring.num; |
1426 | ||
afd9096e | 1427 | if (vq->inuse >= vq->vring.num) { |
ec55da19 | 1428 | virtio_error(vdev, "Virtqueue size exceeded"); |
97cd965c | 1429 | goto done; |
afd9096e SH |
1430 | } |
1431 | ||
fb1131b6 | 1432 | if (!virtqueue_get_head(vq, vq->last_avail_idx++, &head)) { |
97cd965c | 1433 | goto done; |
fb1131b6 SH |
1434 | } |
1435 | ||
95129d6f | 1436 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
e9600c6c | 1437 | vring_set_avail_event(vq, vq->last_avail_idx); |
bcbabae8 | 1438 | } |
efeea6d0 | 1439 | |
fb1131b6 | 1440 | i = head; |
9796d0ac | 1441 | |
e0e2d644 | 1442 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
1443 | if (!caches) { |
1444 | virtio_error(vdev, "Region caches not initialized"); | |
1445 | goto done; | |
1446 | } | |
1447 | ||
991976f7 | 1448 | if (caches->desc.len < max * sizeof(VRingDesc)) { |
9796d0ac PB |
1449 | virtio_error(vdev, "Cannot map descriptor ring"); |
1450 | goto done; | |
1451 | } | |
1452 | ||
991976f7 | 1453 | desc_cache = &caches->desc; |
86044b24 | 1454 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
aa570d6f | 1455 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
74231929 | 1456 | if (!desc.len || (desc.len % sizeof(VRingDesc))) { |
ec55da19 | 1457 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
9796d0ac | 1458 | goto done; |
efeea6d0 MM |
1459 | } |
1460 | ||
1461 | /* loop over the indirect descriptor table */ | |
5eba0404 PB |
1462 | len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, |
1463 | desc.addr, desc.len, false); | |
1464 | desc_cache = &indirect_desc_cache; | |
9796d0ac PB |
1465 | if (len < desc.len) { |
1466 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1467 | goto done; | |
1468 | } | |
1469 | ||
aa570d6f | 1470 | max = desc.len / sizeof(VRingDesc); |
efeea6d0 | 1471 | i = 0; |
86044b24 | 1472 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
efeea6d0 MM |
1473 | } |
1474 | ||
42fb2e07 | 1475 | /* Collect all the descriptors */ |
967f97fa | 1476 | do { |
ec55da19 SH |
1477 | bool map_ok; |
1478 | ||
aa570d6f | 1479 | if (desc.flags & VRING_DESC_F_WRITE) { |
ec55da19 SH |
1480 | map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num, |
1481 | iov + out_num, | |
1482 | VIRTQUEUE_MAX_SIZE - out_num, true, | |
1483 | desc.addr, desc.len); | |
42fb2e07 | 1484 | } else { |
3b3b0628 | 1485 | if (in_num) { |
ec55da19 SH |
1486 | virtio_error(vdev, "Incorrect order for descriptors"); |
1487 | goto err_undo_map; | |
c8eac1cf | 1488 | } |
ec55da19 SH |
1489 | map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov, |
1490 | VIRTQUEUE_MAX_SIZE, false, | |
1491 | desc.addr, desc.len); | |
1492 | } | |
1493 | if (!map_ok) { | |
1494 | goto err_undo_map; | |
42fb2e07 | 1495 | } |
967f97fa | 1496 | |
967f97fa | 1497 | /* If we've got too many, that implies a descriptor loop. */ |
37ef70be | 1498 | if (++elem_entries > max) { |
ec55da19 SH |
1499 | virtio_error(vdev, "Looped descriptor"); |
1500 | goto err_undo_map; | |
bb6834cf | 1501 | } |
412e0e81 | 1502 | |
86044b24 | 1503 | rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, max, &i); |
412e0e81 SH |
1504 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
1505 | ||
1506 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { | |
1507 | goto err_undo_map; | |
1508 | } | |
967f97fa | 1509 | |
3b3b0628 PB |
1510 | /* Now copy what we have collected and mapped */ |
1511 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
967f97fa | 1512 | elem->index = head; |
86044b24 | 1513 | elem->ndescs = 1; |
3b3b0628 PB |
1514 | for (i = 0; i < out_num; i++) { |
1515 | elem->out_addr[i] = addr[i]; | |
1516 | elem->out_sg[i] = iov[i]; | |
1517 | } | |
1518 | for (i = 0; i < in_num; i++) { | |
1519 | elem->in_addr[i] = addr[out_num + i]; | |
1520 | elem->in_sg[i] = iov[out_num + i]; | |
1521 | } | |
967f97fa AL |
1522 | |
1523 | vq->inuse++; | |
1524 | ||
64979a4d | 1525 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
9796d0ac | 1526 | done: |
5eba0404 | 1527 | address_space_cache_destroy(&indirect_desc_cache); |
9796d0ac | 1528 | |
51b19ebe | 1529 | return elem; |
ec55da19 SH |
1530 | |
1531 | err_undo_map: | |
1532 | virtqueue_undo_map_desc(out_num, in_num, iov); | |
9796d0ac | 1533 | goto done; |
967f97fa AL |
1534 | } |
1535 | ||
86044b24 JW |
1536 | static void *virtqueue_packed_pop(VirtQueue *vq, size_t sz) |
1537 | { | |
1538 | unsigned int i, max; | |
1539 | VRingMemoryRegionCaches *caches; | |
1540 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; | |
1541 | MemoryRegionCache *desc_cache; | |
1542 | int64_t len; | |
1543 | VirtIODevice *vdev = vq->vdev; | |
1544 | VirtQueueElement *elem = NULL; | |
1545 | unsigned out_num, in_num, elem_entries; | |
1546 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; | |
1547 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; | |
1548 | VRingPackedDesc desc; | |
1549 | uint16_t id; | |
1550 | int rc; | |
1551 | ||
b5f53d04 | 1552 | RCU_READ_LOCK_GUARD(); |
86044b24 JW |
1553 | if (virtio_queue_packed_empty_rcu(vq)) { |
1554 | goto done; | |
1555 | } | |
1556 | ||
1557 | /* When we start there are none of either input nor output. */ | |
1558 | out_num = in_num = elem_entries = 0; | |
1559 | ||
1560 | max = vq->vring.num; | |
1561 | ||
1562 | if (vq->inuse >= vq->vring.num) { | |
1563 | virtio_error(vdev, "Virtqueue size exceeded"); | |
1564 | goto done; | |
1565 | } | |
1566 | ||
1567 | i = vq->last_avail_idx; | |
1568 | ||
1569 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
1570 | if (!caches) { |
1571 | virtio_error(vdev, "Region caches not initialized"); | |
1572 | goto done; | |
1573 | } | |
1574 | ||
86044b24 JW |
1575 | if (caches->desc.len < max * sizeof(VRingDesc)) { |
1576 | virtio_error(vdev, "Cannot map descriptor ring"); | |
1577 | goto done; | |
1578 | } | |
1579 | ||
1580 | desc_cache = &caches->desc; | |
1581 | vring_packed_desc_read(vdev, &desc, desc_cache, i, true); | |
1582 | id = desc.id; | |
1583 | if (desc.flags & VRING_DESC_F_INDIRECT) { | |
1584 | if (desc.len % sizeof(VRingPackedDesc)) { | |
1585 | virtio_error(vdev, "Invalid size for indirect buffer table"); | |
1586 | goto done; | |
1587 | } | |
1588 | ||
1589 | /* loop over the indirect descriptor table */ | |
1590 | len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, | |
1591 | desc.addr, desc.len, false); | |
1592 | desc_cache = &indirect_desc_cache; | |
1593 | if (len < desc.len) { | |
1594 | virtio_error(vdev, "Cannot map indirect buffer"); | |
1595 | goto done; | |
1596 | } | |
1597 | ||
1598 | max = desc.len / sizeof(VRingPackedDesc); | |
1599 | i = 0; | |
1600 | vring_packed_desc_read(vdev, &desc, desc_cache, i, false); | |
1601 | } | |
1602 | ||
1603 | /* Collect all the descriptors */ | |
1604 | do { | |
1605 | bool map_ok; | |
1606 | ||
1607 | if (desc.flags & VRING_DESC_F_WRITE) { | |
1608 | map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num, | |
1609 | iov + out_num, | |
1610 | VIRTQUEUE_MAX_SIZE - out_num, true, | |
1611 | desc.addr, desc.len); | |
1612 | } else { | |
1613 | if (in_num) { | |
1614 | virtio_error(vdev, "Incorrect order for descriptors"); | |
1615 | goto err_undo_map; | |
1616 | } | |
1617 | map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov, | |
1618 | VIRTQUEUE_MAX_SIZE, false, | |
1619 | desc.addr, desc.len); | |
1620 | } | |
1621 | if (!map_ok) { | |
1622 | goto err_undo_map; | |
1623 | } | |
1624 | ||
1625 | /* If we've got too many, that implies a descriptor loop. */ | |
1626 | if (++elem_entries > max) { | |
1627 | virtio_error(vdev, "Looped descriptor"); | |
1628 | goto err_undo_map; | |
1629 | } | |
1630 | ||
1631 | rc = virtqueue_packed_read_next_desc(vq, &desc, desc_cache, max, &i, | |
1632 | desc_cache == | |
1633 | &indirect_desc_cache); | |
1634 | } while (rc == VIRTQUEUE_READ_DESC_MORE); | |
1635 | ||
1636 | /* Now copy what we have collected and mapped */ | |
1637 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
1638 | for (i = 0; i < out_num; i++) { | |
1639 | elem->out_addr[i] = addr[i]; | |
1640 | elem->out_sg[i] = iov[i]; | |
1641 | } | |
1642 | for (i = 0; i < in_num; i++) { | |
1643 | elem->in_addr[i] = addr[out_num + i]; | |
1644 | elem->in_sg[i] = iov[out_num + i]; | |
1645 | } | |
1646 | ||
1647 | elem->index = id; | |
1648 | elem->ndescs = (desc_cache == &indirect_desc_cache) ? 1 : elem_entries; | |
1649 | vq->last_avail_idx += elem->ndescs; | |
1650 | vq->inuse += elem->ndescs; | |
1651 | ||
1652 | if (vq->last_avail_idx >= vq->vring.num) { | |
1653 | vq->last_avail_idx -= vq->vring.num; | |
1654 | vq->last_avail_wrap_counter ^= 1; | |
1655 | } | |
1656 | ||
1657 | vq->shadow_avail_idx = vq->last_avail_idx; | |
1658 | vq->shadow_avail_wrap_counter = vq->last_avail_wrap_counter; | |
1659 | ||
1660 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); | |
1661 | done: | |
1662 | address_space_cache_destroy(&indirect_desc_cache); | |
86044b24 JW |
1663 | |
1664 | return elem; | |
1665 | ||
1666 | err_undo_map: | |
1667 | virtqueue_undo_map_desc(out_num, in_num, iov); | |
1668 | goto done; | |
1669 | } | |
1670 | ||
1671 | void *virtqueue_pop(VirtQueue *vq, size_t sz) | |
1672 | { | |
9d7bd082 | 1673 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
1674 | return NULL; |
1675 | } | |
1676 | ||
1677 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { | |
1678 | return virtqueue_packed_pop(vq, sz); | |
1679 | } else { | |
1680 | return virtqueue_split_pop(vq, sz); | |
1681 | } | |
1682 | } | |
1683 | ||
1684 | static unsigned int virtqueue_packed_drop_all(VirtQueue *vq) | |
54e17709 | 1685 | { |
86044b24 JW |
1686 | VRingMemoryRegionCaches *caches; |
1687 | MemoryRegionCache *desc_cache; | |
54e17709 YB |
1688 | unsigned int dropped = 0; |
1689 | VirtQueueElement elem = {}; | |
1690 | VirtIODevice *vdev = vq->vdev; | |
86044b24 | 1691 | VRingPackedDesc desc; |
54e17709 | 1692 | |
ab4dd274 PMD |
1693 | RCU_READ_LOCK_GUARD(); |
1694 | ||
86044b24 | 1695 | caches = vring_get_region_caches(vq); |
abdd16f4 SH |
1696 | if (!caches) { |
1697 | return 0; | |
1698 | } | |
1699 | ||
86044b24 JW |
1700 | desc_cache = &caches->desc; |
1701 | ||
1702 | virtio_queue_set_notification(vq, 0); | |
1703 | ||
1704 | while (vq->inuse < vq->vring.num) { | |
1705 | unsigned int idx = vq->last_avail_idx; | |
1706 | /* | |
1707 | * works similar to virtqueue_pop but does not map buffers | |
1708 | * and does not allocate any memory. | |
1709 | */ | |
1710 | vring_packed_desc_read(vdev, &desc, desc_cache, | |
1711 | vq->last_avail_idx , true); | |
1712 | if (!is_desc_avail(desc.flags, vq->last_avail_wrap_counter)) { | |
1713 | break; | |
1714 | } | |
1715 | elem.index = desc.id; | |
1716 | elem.ndescs = 1; | |
1717 | while (virtqueue_packed_read_next_desc(vq, &desc, desc_cache, | |
1718 | vq->vring.num, &idx, false)) { | |
1719 | ++elem.ndescs; | |
1720 | } | |
1721 | /* | |
1722 | * immediately push the element, nothing to unmap | |
1723 | * as both in_num and out_num are set to 0. | |
1724 | */ | |
1725 | virtqueue_push(vq, &elem, 0); | |
1726 | dropped++; | |
1727 | vq->last_avail_idx += elem.ndescs; | |
1728 | if (vq->last_avail_idx >= vq->vring.num) { | |
1729 | vq->last_avail_idx -= vq->vring.num; | |
1730 | vq->last_avail_wrap_counter ^= 1; | |
1731 | } | |
54e17709 YB |
1732 | } |
1733 | ||
86044b24 JW |
1734 | return dropped; |
1735 | } | |
1736 | ||
1737 | static unsigned int virtqueue_split_drop_all(VirtQueue *vq) | |
1738 | { | |
1739 | unsigned int dropped = 0; | |
1740 | VirtQueueElement elem = {}; | |
1741 | VirtIODevice *vdev = vq->vdev; | |
1742 | bool fEventIdx = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX); | |
1743 | ||
54e17709 YB |
1744 | while (!virtio_queue_empty(vq) && vq->inuse < vq->vring.num) { |
1745 | /* works similar to virtqueue_pop but does not map buffers | |
1746 | * and does not allocate any memory */ | |
1747 | smp_rmb(); | |
1748 | if (!virtqueue_get_head(vq, vq->last_avail_idx, &elem.index)) { | |
1749 | break; | |
1750 | } | |
1751 | vq->inuse++; | |
1752 | vq->last_avail_idx++; | |
1753 | if (fEventIdx) { | |
1754 | vring_set_avail_event(vq, vq->last_avail_idx); | |
1755 | } | |
1756 | /* immediately push the element, nothing to unmap | |
1757 | * as both in_num and out_num are set to 0 */ | |
1758 | virtqueue_push(vq, &elem, 0); | |
1759 | dropped++; | |
1760 | } | |
1761 | ||
1762 | return dropped; | |
1763 | } | |
1764 | ||
86044b24 JW |
1765 | /* virtqueue_drop_all: |
1766 | * @vq: The #VirtQueue | |
1767 | * Drops all queued buffers and indicates them to the guest | |
1768 | * as if they are done. Useful when buffers can not be | |
1769 | * processed but must be returned to the guest. | |
1770 | */ | |
1771 | unsigned int virtqueue_drop_all(VirtQueue *vq) | |
1772 | { | |
1773 | struct VirtIODevice *vdev = vq->vdev; | |
1774 | ||
9d7bd082 | 1775 | if (virtio_device_disabled(vq->vdev)) { |
86044b24 JW |
1776 | return 0; |
1777 | } | |
1778 | ||
1779 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
1780 | return virtqueue_packed_drop_all(vq); | |
1781 | } else { | |
1782 | return virtqueue_split_drop_all(vq); | |
1783 | } | |
1784 | } | |
1785 | ||
3724650d PB |
1786 | /* Reading and writing a structure directly to QEMUFile is *awful*, but |
1787 | * it is what QEMU has always done by mistake. We can change it sooner | |
1788 | * or later by bumping the version number of the affected vm states. | |
1789 | * In the meanwhile, since the in-memory layout of VirtQueueElement | |
1790 | * has changed, we need to marshal to and from the layout that was | |
1791 | * used before the change. | |
1792 | */ | |
1793 | typedef struct VirtQueueElementOld { | |
1794 | unsigned int index; | |
1795 | unsigned int out_num; | |
1796 | unsigned int in_num; | |
1797 | hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; | |
1798 | hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; | |
1799 | struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; | |
1800 | struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; | |
1801 | } VirtQueueElementOld; | |
1802 | ||
8607f5c3 | 1803 | void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz) |
ab281c17 | 1804 | { |
3724650d PB |
1805 | VirtQueueElement *elem; |
1806 | VirtQueueElementOld data; | |
1807 | int i; | |
1808 | ||
1809 | qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); | |
1810 | ||
6bdc21c0 MT |
1811 | /* TODO: teach all callers that this can fail, and return failure instead |
1812 | * of asserting here. | |
262a69f4 EB |
1813 | * This is just one thing (there are probably more) that must be |
1814 | * fixed before we can allow NDEBUG compilation. | |
6bdc21c0 | 1815 | */ |
6bdc21c0 MT |
1816 | assert(ARRAY_SIZE(data.in_addr) >= data.in_num); |
1817 | assert(ARRAY_SIZE(data.out_addr) >= data.out_num); | |
1818 | ||
3724650d PB |
1819 | elem = virtqueue_alloc_element(sz, data.out_num, data.in_num); |
1820 | elem->index = data.index; | |
1821 | ||
1822 | for (i = 0; i < elem->in_num; i++) { | |
1823 | elem->in_addr[i] = data.in_addr[i]; | |
1824 | } | |
1825 | ||
1826 | for (i = 0; i < elem->out_num; i++) { | |
1827 | elem->out_addr[i] = data.out_addr[i]; | |
1828 | } | |
1829 | ||
1830 | for (i = 0; i < elem->in_num; i++) { | |
1831 | /* Base is overwritten by virtqueue_map. */ | |
1832 | elem->in_sg[i].iov_base = 0; | |
1833 | elem->in_sg[i].iov_len = data.in_sg[i].iov_len; | |
1834 | } | |
1835 | ||
1836 | for (i = 0; i < elem->out_num; i++) { | |
1837 | /* Base is overwritten by virtqueue_map. */ | |
1838 | elem->out_sg[i].iov_base = 0; | |
1839 | elem->out_sg[i].iov_len = data.out_sg[i].iov_len; | |
1840 | } | |
1841 | ||
86044b24 JW |
1842 | if (virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
1843 | qemu_get_be32s(f, &elem->ndescs); | |
1844 | } | |
1845 | ||
8607f5c3 | 1846 | virtqueue_map(vdev, elem); |
ab281c17 PB |
1847 | return elem; |
1848 | } | |
1849 | ||
86044b24 JW |
1850 | void qemu_put_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, |
1851 | VirtQueueElement *elem) | |
ab281c17 | 1852 | { |
3724650d PB |
1853 | VirtQueueElementOld data; |
1854 | int i; | |
1855 | ||
1856 | memset(&data, 0, sizeof(data)); | |
1857 | data.index = elem->index; | |
1858 | data.in_num = elem->in_num; | |
1859 | data.out_num = elem->out_num; | |
1860 | ||
1861 | for (i = 0; i < elem->in_num; i++) { | |
1862 | data.in_addr[i] = elem->in_addr[i]; | |
1863 | } | |
1864 | ||
1865 | for (i = 0; i < elem->out_num; i++) { | |
1866 | data.out_addr[i] = elem->out_addr[i]; | |
1867 | } | |
1868 | ||
1869 | for (i = 0; i < elem->in_num; i++) { | |
1870 | /* Base is overwritten by virtqueue_map when loading. Do not | |
1871 | * save it, as it would leak the QEMU address space layout. */ | |
1872 | data.in_sg[i].iov_len = elem->in_sg[i].iov_len; | |
1873 | } | |
1874 | ||
1875 | for (i = 0; i < elem->out_num; i++) { | |
1876 | /* Do not save iov_base as above. */ | |
1877 | data.out_sg[i].iov_len = elem->out_sg[i].iov_len; | |
1878 | } | |
86044b24 JW |
1879 | |
1880 | if (virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
1881 | qemu_put_be32s(f, &elem->ndescs); | |
1882 | } | |
1883 | ||
3724650d | 1884 | qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); |
ab281c17 PB |
1885 | } |
1886 | ||
967f97fa | 1887 | /* virtio device */ |
7055e687 MT |
1888 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
1889 | { | |
1c819449 FK |
1890 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
1891 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1892 | ||
9d7bd082 | 1893 | if (virtio_device_disabled(vdev)) { |
f5ed3663 SH |
1894 | return; |
1895 | } | |
1896 | ||
1c819449 FK |
1897 | if (k->notify) { |
1898 | k->notify(qbus->parent, vector); | |
7055e687 MT |
1899 | } |
1900 | } | |
967f97fa | 1901 | |
53c25cea | 1902 | void virtio_update_irq(VirtIODevice *vdev) |
967f97fa | 1903 | { |
7055e687 | 1904 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
967f97fa AL |
1905 | } |
1906 | ||
0b352fd6 CH |
1907 | static int virtio_validate_features(VirtIODevice *vdev) |
1908 | { | |
1909 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
1910 | ||
8607f5c3 JW |
1911 | if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM) && |
1912 | !virtio_vdev_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) { | |
1913 | return -EFAULT; | |
1914 | } | |
1915 | ||
0b352fd6 CH |
1916 | if (k->validate_features) { |
1917 | return k->validate_features(vdev); | |
1918 | } else { | |
1919 | return 0; | |
1920 | } | |
1921 | } | |
1922 | ||
1923 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) | |
4e1837f8 | 1924 | { |
181103cd | 1925 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
4e1837f8 SH |
1926 | trace_virtio_set_status(vdev, val); |
1927 | ||
95129d6f | 1928 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
0b352fd6 CH |
1929 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && |
1930 | val & VIRTIO_CONFIG_S_FEATURES_OK) { | |
1931 | int ret = virtio_validate_features(vdev); | |
1932 | ||
1933 | if (ret) { | |
1934 | return ret; | |
1935 | } | |
1936 | } | |
1937 | } | |
e57f2c31 | 1938 | |
4c5cf37b XY |
1939 | if ((vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) != |
1940 | (val & VIRTIO_CONFIG_S_DRIVER_OK)) { | |
1941 | virtio_set_started(vdev, val & VIRTIO_CONFIG_S_DRIVER_OK); | |
1942 | } | |
badaf79c | 1943 | |
181103cd FK |
1944 | if (k->set_status) { |
1945 | k->set_status(vdev, val); | |
4e1837f8 SH |
1946 | } |
1947 | vdev->status = val; | |
badaf79c | 1948 | |
0b352fd6 | 1949 | return 0; |
4e1837f8 SH |
1950 | } |
1951 | ||
616a6552 GK |
1952 | static enum virtio_device_endian virtio_default_endian(void) |
1953 | { | |
1954 | if (target_words_bigendian()) { | |
1955 | return VIRTIO_DEVICE_ENDIAN_BIG; | |
1956 | } else { | |
1957 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
1958 | } | |
1959 | } | |
1960 | ||
1961 | static enum virtio_device_endian virtio_current_cpu_endian(void) | |
1962 | { | |
cdba7e2f | 1963 | if (cpu_virtio_is_big_endian(current_cpu)) { |
616a6552 GK |
1964 | return VIRTIO_DEVICE_ENDIAN_BIG; |
1965 | } else { | |
1966 | return VIRTIO_DEVICE_ENDIAN_LITTLE; | |
1967 | } | |
1968 | } | |
1969 | ||
53c25cea | 1970 | void virtio_reset(void *opaque) |
967f97fa AL |
1971 | { |
1972 | VirtIODevice *vdev = opaque; | |
181103cd | 1973 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
1974 | int i; |
1975 | ||
e0c472d8 | 1976 | virtio_set_status(vdev, 0); |
616a6552 GK |
1977 | if (current_cpu) { |
1978 | /* Guest initiated reset */ | |
1979 | vdev->device_endian = virtio_current_cpu_endian(); | |
1980 | } else { | |
1981 | /* System reset */ | |
1982 | vdev->device_endian = virtio_default_endian(); | |
1983 | } | |
e0c472d8 | 1984 | |
181103cd FK |
1985 | if (k->reset) { |
1986 | k->reset(vdev); | |
1987 | } | |
967f97fa | 1988 | |
868a8f44 | 1989 | vdev->start_on_kick = false; |
badaf79c | 1990 | vdev->started = false; |
f5ed3663 | 1991 | vdev->broken = false; |
704a76fc | 1992 | vdev->guest_features = 0; |
967f97fa AL |
1993 | vdev->queue_sel = 0; |
1994 | vdev->status = 0; | |
9d7bd082 | 1995 | vdev->disabled = false; |
d73415a3 | 1996 | qatomic_set(&vdev->isr, 0); |
7055e687 MT |
1997 | vdev->config_vector = VIRTIO_NO_VECTOR; |
1998 | virtio_notify_vector(vdev, vdev->config_vector); | |
967f97fa | 1999 | |
87b3bd1c | 2000 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2001 | vdev->vq[i].vring.desc = 0; |
2002 | vdev->vq[i].vring.avail = 0; | |
2003 | vdev->vq[i].vring.used = 0; | |
2004 | vdev->vq[i].last_avail_idx = 0; | |
be1fea9b | 2005 | vdev->vq[i].shadow_avail_idx = 0; |
b796fcd1 | 2006 | vdev->vq[i].used_idx = 0; |
86044b24 JW |
2007 | vdev->vq[i].last_avail_wrap_counter = true; |
2008 | vdev->vq[i].shadow_avail_wrap_counter = true; | |
2009 | vdev->vq[i].used_wrap_counter = true; | |
e0d686bf | 2010 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); |
bcbabae8 MT |
2011 | vdev->vq[i].signalled_used = 0; |
2012 | vdev->vq[i].signalled_used_valid = false; | |
332fa82d | 2013 | vdev->vq[i].notification = true; |
46c5d082 | 2014 | vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; |
4b7f91ed | 2015 | vdev->vq[i].inuse = 0; |
e0e2d644 | 2016 | virtio_virtqueue_reset_region_cache(&vdev->vq[i]); |
967f97fa AL |
2017 | } |
2018 | } | |
2019 | ||
53c25cea | 2020 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2021 | { |
181103cd | 2022 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2023 | uint8_t val; |
2024 | ||
5f5a1318 | 2025 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2026 | return (uint32_t)-1; |
5f5a1318 JW |
2027 | } |
2028 | ||
2029 | k->get_config(vdev, vdev->config); | |
967f97fa | 2030 | |
06dbfc6f | 2031 | val = ldub_p(vdev->config + addr); |
967f97fa AL |
2032 | return val; |
2033 | } | |
2034 | ||
53c25cea | 2035 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2036 | { |
181103cd | 2037 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2038 | uint16_t val; |
2039 | ||
5f5a1318 | 2040 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2041 | return (uint32_t)-1; |
5f5a1318 JW |
2042 | } |
2043 | ||
2044 | k->get_config(vdev, vdev->config); | |
967f97fa | 2045 | |
06dbfc6f | 2046 | val = lduw_p(vdev->config + addr); |
967f97fa AL |
2047 | return val; |
2048 | } | |
2049 | ||
53c25cea | 2050 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
967f97fa | 2051 | { |
181103cd | 2052 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2053 | uint32_t val; |
2054 | ||
5f5a1318 | 2055 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2056 | return (uint32_t)-1; |
5f5a1318 JW |
2057 | } |
2058 | ||
2059 | k->get_config(vdev, vdev->config); | |
967f97fa | 2060 | |
06dbfc6f | 2061 | val = ldl_p(vdev->config + addr); |
967f97fa AL |
2062 | return val; |
2063 | } | |
2064 | ||
53c25cea | 2065 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2066 | { |
181103cd | 2067 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2068 | uint8_t val = data; |
2069 | ||
5f5a1318 | 2070 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2071 | return; |
5f5a1318 | 2072 | } |
967f97fa | 2073 | |
06dbfc6f | 2074 | stb_p(vdev->config + addr, val); |
967f97fa | 2075 | |
181103cd FK |
2076 | if (k->set_config) { |
2077 | k->set_config(vdev, vdev->config); | |
2078 | } | |
967f97fa AL |
2079 | } |
2080 | ||
53c25cea | 2081 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2082 | { |
181103cd | 2083 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2084 | uint16_t val = data; |
2085 | ||
5f5a1318 | 2086 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2087 | return; |
5f5a1318 | 2088 | } |
967f97fa | 2089 | |
06dbfc6f | 2090 | stw_p(vdev->config + addr, val); |
967f97fa | 2091 | |
181103cd FK |
2092 | if (k->set_config) { |
2093 | k->set_config(vdev, vdev->config); | |
2094 | } | |
967f97fa AL |
2095 | } |
2096 | ||
53c25cea | 2097 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
967f97fa | 2098 | { |
181103cd | 2099 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa AL |
2100 | uint32_t val = data; |
2101 | ||
5f5a1318 | 2102 | if (addr + sizeof(val) > vdev->config_len) { |
967f97fa | 2103 | return; |
5f5a1318 | 2104 | } |
967f97fa | 2105 | |
06dbfc6f | 2106 | stl_p(vdev->config + addr, val); |
967f97fa | 2107 | |
181103cd FK |
2108 | if (k->set_config) { |
2109 | k->set_config(vdev, vdev->config); | |
2110 | } | |
967f97fa AL |
2111 | } |
2112 | ||
adfb743c MT |
2113 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr) |
2114 | { | |
2115 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2116 | uint8_t val; | |
2117 | ||
2118 | if (addr + sizeof(val) > vdev->config_len) { | |
2119 | return (uint32_t)-1; | |
2120 | } | |
2121 | ||
2122 | k->get_config(vdev, vdev->config); | |
2123 | ||
2124 | val = ldub_p(vdev->config + addr); | |
2125 | return val; | |
2126 | } | |
2127 | ||
2128 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr) | |
2129 | { | |
2130 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2131 | uint16_t val; | |
2132 | ||
2133 | if (addr + sizeof(val) > vdev->config_len) { | |
2134 | return (uint32_t)-1; | |
2135 | } | |
2136 | ||
2137 | k->get_config(vdev, vdev->config); | |
2138 | ||
2139 | val = lduw_le_p(vdev->config + addr); | |
2140 | return val; | |
2141 | } | |
2142 | ||
2143 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr) | |
2144 | { | |
2145 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2146 | uint32_t val; | |
2147 | ||
2148 | if (addr + sizeof(val) > vdev->config_len) { | |
2149 | return (uint32_t)-1; | |
2150 | } | |
2151 | ||
2152 | k->get_config(vdev, vdev->config); | |
2153 | ||
2154 | val = ldl_le_p(vdev->config + addr); | |
2155 | return val; | |
2156 | } | |
2157 | ||
2158 | void virtio_config_modern_writeb(VirtIODevice *vdev, | |
2159 | uint32_t addr, uint32_t data) | |
2160 | { | |
2161 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2162 | uint8_t val = data; | |
2163 | ||
2164 | if (addr + sizeof(val) > vdev->config_len) { | |
2165 | return; | |
2166 | } | |
2167 | ||
2168 | stb_p(vdev->config + addr, val); | |
2169 | ||
2170 | if (k->set_config) { | |
2171 | k->set_config(vdev, vdev->config); | |
2172 | } | |
2173 | } | |
2174 | ||
2175 | void virtio_config_modern_writew(VirtIODevice *vdev, | |
2176 | uint32_t addr, uint32_t data) | |
2177 | { | |
2178 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2179 | uint16_t val = data; | |
2180 | ||
2181 | if (addr + sizeof(val) > vdev->config_len) { | |
2182 | return; | |
2183 | } | |
2184 | ||
2185 | stw_le_p(vdev->config + addr, val); | |
2186 | ||
2187 | if (k->set_config) { | |
2188 | k->set_config(vdev, vdev->config); | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | void virtio_config_modern_writel(VirtIODevice *vdev, | |
2193 | uint32_t addr, uint32_t data) | |
2194 | { | |
2195 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
2196 | uint32_t val = data; | |
2197 | ||
2198 | if (addr + sizeof(val) > vdev->config_len) { | |
2199 | return; | |
2200 | } | |
2201 | ||
2202 | stl_le_p(vdev->config + addr, val); | |
2203 | ||
2204 | if (k->set_config) { | |
2205 | k->set_config(vdev, vdev->config); | |
2206 | } | |
2207 | } | |
2208 | ||
a8170e5e | 2209 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) |
967f97fa | 2210 | { |
758ead31 PP |
2211 | if (!vdev->vq[n].vring.num) { |
2212 | return; | |
2213 | } | |
ab223c95 CH |
2214 | vdev->vq[n].vring.desc = addr; |
2215 | virtio_queue_update_rings(vdev, n); | |
53c25cea PB |
2216 | } |
2217 | ||
a8170e5e | 2218 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) |
53c25cea | 2219 | { |
ab223c95 CH |
2220 | return vdev->vq[n].vring.desc; |
2221 | } | |
2222 | ||
2223 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, | |
2224 | hwaddr avail, hwaddr used) | |
2225 | { | |
758ead31 PP |
2226 | if (!vdev->vq[n].vring.num) { |
2227 | return; | |
2228 | } | |
ab223c95 CH |
2229 | vdev->vq[n].vring.desc = desc; |
2230 | vdev->vq[n].vring.avail = avail; | |
2231 | vdev->vq[n].vring.used = used; | |
c611c764 | 2232 | virtio_init_region_cache(vdev, n); |
53c25cea PB |
2233 | } |
2234 | ||
e63c0ba1 PM |
2235 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) |
2236 | { | |
f6049f44 PM |
2237 | /* Don't allow guest to flip queue between existent and |
2238 | * nonexistent states, or to set it to an invalid size. | |
2239 | */ | |
2240 | if (!!num != !!vdev->vq[n].vring.num || | |
2241 | num > VIRTQUEUE_MAX_SIZE || | |
2242 | num < 0) { | |
2243 | return; | |
e63c0ba1 | 2244 | } |
f6049f44 | 2245 | vdev->vq[n].vring.num = num; |
e63c0ba1 PM |
2246 | } |
2247 | ||
e0d686bf JW |
2248 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) |
2249 | { | |
2250 | return QLIST_FIRST(&vdev->vector_queues[vector]); | |
2251 | } | |
2252 | ||
2253 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) | |
2254 | { | |
2255 | return QLIST_NEXT(vq, node); | |
2256 | } | |
2257 | ||
53c25cea PB |
2258 | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
2259 | { | |
2260 | return vdev->vq[n].vring.num; | |
2261 | } | |
967f97fa | 2262 | |
8c797e75 MT |
2263 | int virtio_queue_get_max_num(VirtIODevice *vdev, int n) |
2264 | { | |
2265 | return vdev->vq[n].vring.num_default; | |
2266 | } | |
2267 | ||
8ad176aa JW |
2268 | int virtio_get_num_queues(VirtIODevice *vdev) |
2269 | { | |
2270 | int i; | |
2271 | ||
87b3bd1c | 2272 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
8ad176aa JW |
2273 | if (!virtio_queue_get_num(vdev, i)) { |
2274 | break; | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | return i; | |
2279 | } | |
2280 | ||
6ce69d1c PM |
2281 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) |
2282 | { | |
2283 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2284 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2285 | ||
ab223c95 | 2286 | /* virtio-1 compliant devices cannot change the alignment */ |
95129d6f | 2287 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
ab223c95 CH |
2288 | error_report("tried to modify queue alignment for virtio-1 device"); |
2289 | return; | |
2290 | } | |
6ce69d1c PM |
2291 | /* Check that the transport told us it was going to do this |
2292 | * (so a buggy transport will immediately assert rather than | |
2293 | * silently failing to migrate this state) | |
2294 | */ | |
2295 | assert(k->has_variable_vring_alignment); | |
2296 | ||
758ead31 PP |
2297 | if (align) { |
2298 | vdev->vq[n].vring.align = align; | |
2299 | virtio_queue_update_rings(vdev, n); | |
2300 | } | |
6ce69d1c PM |
2301 | } |
2302 | ||
07931698 | 2303 | static bool virtio_queue_notify_aio_vq(VirtQueue *vq) |
344dc16f | 2304 | { |
badaf79c XY |
2305 | bool ret = false; |
2306 | ||
344dc16f MT |
2307 | if (vq->vring.desc && vq->handle_aio_output) { |
2308 | VirtIODevice *vdev = vq->vdev; | |
2309 | ||
2310 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
badaf79c XY |
2311 | ret = vq->handle_aio_output(vdev, vq); |
2312 | ||
2313 | if (unlikely(vdev->start_on_kick)) { | |
e57f2c31 | 2314 | virtio_set_started(vdev, true); |
badaf79c | 2315 | } |
344dc16f | 2316 | } |
07931698 | 2317 | |
badaf79c | 2318 | return ret; |
344dc16f MT |
2319 | } |
2320 | ||
2b2cbcad | 2321 | static void virtio_queue_notify_vq(VirtQueue *vq) |
25db9ebe | 2322 | { |
9e0f5b81 | 2323 | if (vq->vring.desc && vq->handle_output) { |
25db9ebe | 2324 | VirtIODevice *vdev = vq->vdev; |
9e0f5b81 | 2325 | |
f5ed3663 SH |
2326 | if (unlikely(vdev->broken)) { |
2327 | return; | |
2328 | } | |
2329 | ||
25db9ebe SH |
2330 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
2331 | vq->handle_output(vdev, vq); | |
badaf79c XY |
2332 | |
2333 | if (unlikely(vdev->start_on_kick)) { | |
e57f2c31 | 2334 | virtio_set_started(vdev, true); |
badaf79c | 2335 | } |
25db9ebe SH |
2336 | } |
2337 | } | |
2338 | ||
53c25cea PB |
2339 | void virtio_queue_notify(VirtIODevice *vdev, int n) |
2340 | { | |
e49a6618 PB |
2341 | VirtQueue *vq = &vdev->vq[n]; |
2342 | ||
2343 | if (unlikely(!vq->vring.desc || vdev->broken)) { | |
2344 | return; | |
2345 | } | |
2346 | ||
2347 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); | |
fcccb271 | 2348 | if (vq->host_notifier_enabled) { |
e49a6618 PB |
2349 | event_notifier_set(&vq->host_notifier); |
2350 | } else if (vq->handle_output) { | |
2351 | vq->handle_output(vdev, vq); | |
badaf79c | 2352 | |
8b04e2c7 XY |
2353 | if (unlikely(vdev->start_on_kick)) { |
2354 | virtio_set_started(vdev, true); | |
2355 | } | |
badaf79c | 2356 | } |
967f97fa AL |
2357 | } |
2358 | ||
7055e687 MT |
2359 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) |
2360 | { | |
87b3bd1c | 2361 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : |
7055e687 MT |
2362 | VIRTIO_NO_VECTOR; |
2363 | } | |
2364 | ||
2365 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) | |
2366 | { | |
e0d686bf JW |
2367 | VirtQueue *vq = &vdev->vq[n]; |
2368 | ||
87b3bd1c | 2369 | if (n < VIRTIO_QUEUE_MAX) { |
e0d686bf JW |
2370 | if (vdev->vector_queues && |
2371 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { | |
2372 | QLIST_REMOVE(vq, node); | |
2373 | } | |
7055e687 | 2374 | vdev->vq[n].vector = vector; |
e0d686bf JW |
2375 | if (vdev->vector_queues && |
2376 | vector != VIRTIO_NO_VECTOR) { | |
2377 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); | |
2378 | } | |
2379 | } | |
7055e687 MT |
2380 | } |
2381 | ||
f1ac6a55 PB |
2382 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, |
2383 | VirtIOHandleOutput handle_output) | |
967f97fa AL |
2384 | { |
2385 | int i; | |
2386 | ||
87b3bd1c | 2387 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2388 | if (vdev->vq[i].vring.num == 0) |
2389 | break; | |
2390 | } | |
2391 | ||
87b3bd1c | 2392 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) |
967f97fa AL |
2393 | abort(); |
2394 | ||
2395 | vdev->vq[i].vring.num = queue_size; | |
46c5d082 | 2396 | vdev->vq[i].vring.num_default = queue_size; |
6ce69d1c | 2397 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; |
967f97fa | 2398 | vdev->vq[i].handle_output = handle_output; |
344dc16f | 2399 | vdev->vq[i].handle_aio_output = NULL; |
86044b24 JW |
2400 | vdev->vq[i].used_elems = g_malloc0(sizeof(VirtQueueElement) * |
2401 | queue_size); | |
967f97fa AL |
2402 | |
2403 | return &vdev->vq[i]; | |
2404 | } | |
2405 | ||
722f8c51 MT |
2406 | void virtio_delete_queue(VirtQueue *vq) |
2407 | { | |
2408 | vq->vring.num = 0; | |
2409 | vq->vring.num_default = 0; | |
2410 | vq->handle_output = NULL; | |
2411 | vq->handle_aio_output = NULL; | |
2412 | g_free(vq->used_elems); | |
8cd353ea | 2413 | vq->used_elems = NULL; |
421afd2f | 2414 | virtio_virtqueue_reset_region_cache(vq); |
722f8c51 MT |
2415 | } |
2416 | ||
f23fd811 JW |
2417 | void virtio_del_queue(VirtIODevice *vdev, int n) |
2418 | { | |
87b3bd1c | 2419 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { |
f23fd811 JW |
2420 | abort(); |
2421 | } | |
2422 | ||
722f8c51 | 2423 | virtio_delete_queue(&vdev->vq[n]); |
f23fd811 JW |
2424 | } |
2425 | ||
0687c37c PB |
2426 | static void virtio_set_isr(VirtIODevice *vdev, int value) |
2427 | { | |
d73415a3 | 2428 | uint8_t old = qatomic_read(&vdev->isr); |
0687c37c PB |
2429 | |
2430 | /* Do not write ISR if it does not change, so that its cacheline remains | |
2431 | * shared in the common case where the guest does not read it. | |
2432 | */ | |
2433 | if ((old & value) != value) { | |
d73415a3 | 2434 | qatomic_or(&vdev->isr, value); |
0687c37c PB |
2435 | } |
2436 | } | |
2437 | ||
4c6dd9a0 | 2438 | /* Called within rcu_read_lock(). */ |
683f7665 | 2439 | static bool virtio_split_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
bcbabae8 MT |
2440 | { |
2441 | uint16_t old, new; | |
2442 | bool v; | |
a281ebc1 MT |
2443 | /* We need to expose used array entries before checking used event. */ |
2444 | smp_mb(); | |
97b83deb | 2445 | /* Always notify when queue is empty (when feature acknowledge) */ |
95129d6f | 2446 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && |
be1fea9b | 2447 | !vq->inuse && virtio_queue_empty(vq)) { |
bcbabae8 MT |
2448 | return true; |
2449 | } | |
2450 | ||
95129d6f | 2451 | if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
bcbabae8 MT |
2452 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); |
2453 | } | |
2454 | ||
2455 | v = vq->signalled_used_valid; | |
2456 | vq->signalled_used_valid = true; | |
2457 | old = vq->signalled_used; | |
b796fcd1 | 2458 | new = vq->signalled_used = vq->used_idx; |
e9600c6c | 2459 | return !v || vring_need_event(vring_get_used_event(vq), new, old); |
bcbabae8 MT |
2460 | } |
2461 | ||
683f7665 JW |
2462 | static bool vring_packed_need_event(VirtQueue *vq, bool wrap, |
2463 | uint16_t off_wrap, uint16_t new, | |
2464 | uint16_t old) | |
2465 | { | |
2466 | int off = off_wrap & ~(1 << 15); | |
2467 | ||
2468 | if (wrap != off_wrap >> 15) { | |
2469 | off -= vq->vring.num; | |
2470 | } | |
2471 | ||
2472 | return vring_need_event(off, new, old); | |
2473 | } | |
2474 | ||
4c6dd9a0 | 2475 | /* Called within rcu_read_lock(). */ |
683f7665 JW |
2476 | static bool virtio_packed_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
2477 | { | |
2478 | VRingPackedDescEvent e; | |
2479 | uint16_t old, new; | |
2480 | bool v; | |
2481 | VRingMemoryRegionCaches *caches; | |
2482 | ||
2483 | caches = vring_get_region_caches(vq); | |
abdd16f4 SH |
2484 | if (!caches) { |
2485 | return false; | |
2486 | } | |
2487 | ||
683f7665 JW |
2488 | vring_packed_event_read(vdev, &caches->avail, &e); |
2489 | ||
2490 | old = vq->signalled_used; | |
2491 | new = vq->signalled_used = vq->used_idx; | |
2492 | v = vq->signalled_used_valid; | |
2493 | vq->signalled_used_valid = true; | |
2494 | ||
2495 | if (e.flags == VRING_PACKED_EVENT_FLAG_DISABLE) { | |
2496 | return false; | |
2497 | } else if (e.flags == VRING_PACKED_EVENT_FLAG_ENABLE) { | |
2498 | return true; | |
2499 | } | |
2500 | ||
2501 | return !v || vring_packed_need_event(vq, vq->used_wrap_counter, | |
2502 | e.off_wrap, new, old); | |
2503 | } | |
2504 | ||
2505 | /* Called within rcu_read_lock(). */ | |
2506 | static bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq) | |
2507 | { | |
2508 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
2509 | return virtio_packed_should_notify(vdev, vq); | |
2510 | } else { | |
2511 | return virtio_split_should_notify(vdev, vq); | |
2512 | } | |
2513 | } | |
2514 | ||
83d768b5 PB |
2515 | void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq) |
2516 | { | |
b5f53d04 DDAG |
2517 | WITH_RCU_READ_LOCK_GUARD() { |
2518 | if (!virtio_should_notify(vdev, vq)) { | |
2519 | return; | |
2520 | } | |
83d768b5 PB |
2521 | } |
2522 | ||
2523 | trace_virtio_notify_irqfd(vdev, vq); | |
2524 | ||
2525 | /* | |
2526 | * virtio spec 1.0 says ISR bit 0 should be ignored with MSI, but | |
2527 | * windows drivers included in virtio-win 1.8.0 (circa 2015) are | |
2528 | * incorrectly polling this bit during crashdump and hibernation | |
2529 | * in MSI mode, causing a hang if this bit is never updated. | |
2530 | * Recent releases of Windows do not really shut down, but rather | |
2531 | * log out and hibernate to make the next startup faster. Hence, | |
2532 | * this manifested as a more serious hang during shutdown with | |
2533 | * | |
2534 | * Next driver release from 2016 fixed this problem, so working around it | |
2535 | * is not a must, but it's easy to do so let's do it here. | |
2536 | * | |
2537 | * Note: it's safe to update ISR from any thread as it was switched | |
2538 | * to an atomic operation. | |
2539 | */ | |
2540 | virtio_set_isr(vq->vdev, 0x1); | |
2541 | event_notifier_set(&vq->guest_notifier); | |
2542 | } | |
2543 | ||
b4b9862b MT |
2544 | static void virtio_irq(VirtQueue *vq) |
2545 | { | |
2546 | virtio_set_isr(vq->vdev, 0x1); | |
2547 | virtio_notify_vector(vq->vdev, vq->vector); | |
2548 | } | |
2549 | ||
bcbabae8 MT |
2550 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) |
2551 | { | |
b5f53d04 DDAG |
2552 | WITH_RCU_READ_LOCK_GUARD() { |
2553 | if (!virtio_should_notify(vdev, vq)) { | |
2554 | return; | |
2555 | } | |
bcbabae8 | 2556 | } |
967f97fa | 2557 | |
64979a4d | 2558 | trace_virtio_notify(vdev, vq); |
b4b9862b | 2559 | virtio_irq(vq); |
967f97fa AL |
2560 | } |
2561 | ||
2562 | void virtio_notify_config(VirtIODevice *vdev) | |
2563 | { | |
7625162c AL |
2564 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) |
2565 | return; | |
2566 | ||
0687c37c | 2567 | virtio_set_isr(vdev, 0x3); |
b8f05908 | 2568 | vdev->generation++; |
7055e687 | 2569 | virtio_notify_vector(vdev, vdev->config_vector); |
967f97fa AL |
2570 | } |
2571 | ||
616a6552 GK |
2572 | static bool virtio_device_endian_needed(void *opaque) |
2573 | { | |
2574 | VirtIODevice *vdev = opaque; | |
2575 | ||
2576 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); | |
95129d6f | 2577 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
3c185597 CH |
2578 | return vdev->device_endian != virtio_default_endian(); |
2579 | } | |
2580 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
2581 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; | |
616a6552 GK |
2582 | } |
2583 | ||
019a3edb GH |
2584 | static bool virtio_64bit_features_needed(void *opaque) |
2585 | { | |
2586 | VirtIODevice *vdev = opaque; | |
2587 | ||
2588 | return (vdev->host_features >> 32) != 0; | |
2589 | } | |
2590 | ||
74aae7b2 JW |
2591 | static bool virtio_virtqueue_needed(void *opaque) |
2592 | { | |
2593 | VirtIODevice *vdev = opaque; | |
2594 | ||
2595 | return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1); | |
2596 | } | |
2597 | ||
86044b24 JW |
2598 | static bool virtio_packed_virtqueue_needed(void *opaque) |
2599 | { | |
2600 | VirtIODevice *vdev = opaque; | |
2601 | ||
2602 | return virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED); | |
2603 | } | |
2604 | ||
46c5d082 CH |
2605 | static bool virtio_ringsize_needed(void *opaque) |
2606 | { | |
2607 | VirtIODevice *vdev = opaque; | |
2608 | int i; | |
2609 | ||
2610 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
2611 | if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) { | |
2612 | return true; | |
2613 | } | |
2614 | } | |
2615 | return false; | |
2616 | } | |
2617 | ||
a6df8adf JW |
2618 | static bool virtio_extra_state_needed(void *opaque) |
2619 | { | |
2620 | VirtIODevice *vdev = opaque; | |
2621 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2622 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2623 | ||
2624 | return k->has_extra_state && | |
2625 | k->has_extra_state(qbus->parent); | |
2626 | } | |
2627 | ||
791b1daf SH |
2628 | static bool virtio_broken_needed(void *opaque) |
2629 | { | |
2630 | VirtIODevice *vdev = opaque; | |
2631 | ||
2632 | return vdev->broken; | |
2633 | } | |
2634 | ||
badaf79c XY |
2635 | static bool virtio_started_needed(void *opaque) |
2636 | { | |
2637 | VirtIODevice *vdev = opaque; | |
2638 | ||
2639 | return vdev->started; | |
2640 | } | |
2641 | ||
9d7bd082 MR |
2642 | static bool virtio_disabled_needed(void *opaque) |
2643 | { | |
2644 | VirtIODevice *vdev = opaque; | |
2645 | ||
2646 | return vdev->disabled; | |
2647 | } | |
2648 | ||
50e5ae4d | 2649 | static const VMStateDescription vmstate_virtqueue = { |
74aae7b2 | 2650 | .name = "virtqueue_state", |
50e5ae4d DDAG |
2651 | .version_id = 1, |
2652 | .minimum_version_id = 1, | |
2653 | .fields = (VMStateField[]) { | |
2654 | VMSTATE_UINT64(vring.avail, struct VirtQueue), | |
2655 | VMSTATE_UINT64(vring.used, struct VirtQueue), | |
2656 | VMSTATE_END_OF_LIST() | |
2657 | } | |
74aae7b2 JW |
2658 | }; |
2659 | ||
86044b24 JW |
2660 | static const VMStateDescription vmstate_packed_virtqueue = { |
2661 | .name = "packed_virtqueue_state", | |
2662 | .version_id = 1, | |
2663 | .minimum_version_id = 1, | |
2664 | .fields = (VMStateField[]) { | |
2665 | VMSTATE_UINT16(last_avail_idx, struct VirtQueue), | |
2666 | VMSTATE_BOOL(last_avail_wrap_counter, struct VirtQueue), | |
2667 | VMSTATE_UINT16(used_idx, struct VirtQueue), | |
2668 | VMSTATE_BOOL(used_wrap_counter, struct VirtQueue), | |
2669 | VMSTATE_UINT32(inuse, struct VirtQueue), | |
2670 | VMSTATE_END_OF_LIST() | |
2671 | } | |
2672 | }; | |
2673 | ||
74aae7b2 JW |
2674 | static const VMStateDescription vmstate_virtio_virtqueues = { |
2675 | .name = "virtio/virtqueues", | |
2676 | .version_id = 1, | |
2677 | .minimum_version_id = 1, | |
2678 | .needed = &virtio_virtqueue_needed, | |
2679 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
2680 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
2681 | VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue), | |
74aae7b2 JW |
2682 | VMSTATE_END_OF_LIST() |
2683 | } | |
2684 | }; | |
2685 | ||
86044b24 JW |
2686 | static const VMStateDescription vmstate_virtio_packed_virtqueues = { |
2687 | .name = "virtio/packed_virtqueues", | |
2688 | .version_id = 1, | |
2689 | .minimum_version_id = 1, | |
2690 | .needed = &virtio_packed_virtqueue_needed, | |
2691 | .fields = (VMStateField[]) { | |
2692 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, | |
2693 | VIRTIO_QUEUE_MAX, 0, vmstate_packed_virtqueue, VirtQueue), | |
2694 | VMSTATE_END_OF_LIST() | |
2695 | } | |
2696 | }; | |
2697 | ||
50e5ae4d | 2698 | static const VMStateDescription vmstate_ringsize = { |
46c5d082 | 2699 | .name = "ringsize_state", |
50e5ae4d DDAG |
2700 | .version_id = 1, |
2701 | .minimum_version_id = 1, | |
2702 | .fields = (VMStateField[]) { | |
2703 | VMSTATE_UINT32(vring.num_default, struct VirtQueue), | |
2704 | VMSTATE_END_OF_LIST() | |
2705 | } | |
46c5d082 CH |
2706 | }; |
2707 | ||
2708 | static const VMStateDescription vmstate_virtio_ringsize = { | |
2709 | .name = "virtio/ringsize", | |
2710 | .version_id = 1, | |
2711 | .minimum_version_id = 1, | |
2712 | .needed = &virtio_ringsize_needed, | |
2713 | .fields = (VMStateField[]) { | |
3e996cc5 DDAG |
2714 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
2715 | VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue), | |
46c5d082 CH |
2716 | VMSTATE_END_OF_LIST() |
2717 | } | |
2718 | }; | |
2719 | ||
2c21ee76 | 2720 | static int get_extra_state(QEMUFile *f, void *pv, size_t size, |
03fee66f | 2721 | const VMStateField *field) |
a6df8adf JW |
2722 | { |
2723 | VirtIODevice *vdev = pv; | |
2724 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2725 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2726 | ||
2727 | if (!k->load_extra_state) { | |
2728 | return -1; | |
2729 | } else { | |
2730 | return k->load_extra_state(qbus->parent, f); | |
2731 | } | |
2732 | } | |
2733 | ||
2c21ee76 | 2734 | static int put_extra_state(QEMUFile *f, void *pv, size_t size, |
3ddba9a9 | 2735 | const VMStateField *field, JSONWriter *vmdesc) |
a6df8adf JW |
2736 | { |
2737 | VirtIODevice *vdev = pv; | |
2738 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
2739 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
2740 | ||
2741 | k->save_extra_state(qbus->parent, f); | |
2c21ee76 | 2742 | return 0; |
a6df8adf JW |
2743 | } |
2744 | ||
2745 | static const VMStateInfo vmstate_info_extra_state = { | |
2746 | .name = "virtqueue_extra_state", | |
2747 | .get = get_extra_state, | |
2748 | .put = put_extra_state, | |
2749 | }; | |
2750 | ||
2751 | static const VMStateDescription vmstate_virtio_extra_state = { | |
2752 | .name = "virtio/extra_state", | |
2753 | .version_id = 1, | |
2754 | .minimum_version_id = 1, | |
2755 | .needed = &virtio_extra_state_needed, | |
2756 | .fields = (VMStateField[]) { | |
2757 | { | |
2758 | .name = "extra_state", | |
2759 | .version_id = 0, | |
2760 | .field_exists = NULL, | |
2761 | .size = 0, | |
2762 | .info = &vmstate_info_extra_state, | |
2763 | .flags = VMS_SINGLE, | |
2764 | .offset = 0, | |
2765 | }, | |
2766 | VMSTATE_END_OF_LIST() | |
2767 | } | |
2768 | }; | |
2769 | ||
616a6552 GK |
2770 | static const VMStateDescription vmstate_virtio_device_endian = { |
2771 | .name = "virtio/device_endian", | |
2772 | .version_id = 1, | |
2773 | .minimum_version_id = 1, | |
5cd8cada | 2774 | .needed = &virtio_device_endian_needed, |
616a6552 GK |
2775 | .fields = (VMStateField[]) { |
2776 | VMSTATE_UINT8(device_endian, VirtIODevice), | |
2777 | VMSTATE_END_OF_LIST() | |
2778 | } | |
2779 | }; | |
2780 | ||
019a3edb GH |
2781 | static const VMStateDescription vmstate_virtio_64bit_features = { |
2782 | .name = "virtio/64bit_features", | |
2783 | .version_id = 1, | |
2784 | .minimum_version_id = 1, | |
5cd8cada | 2785 | .needed = &virtio_64bit_features_needed, |
019a3edb GH |
2786 | .fields = (VMStateField[]) { |
2787 | VMSTATE_UINT64(guest_features, VirtIODevice), | |
2788 | VMSTATE_END_OF_LIST() | |
2789 | } | |
2790 | }; | |
2791 | ||
791b1daf SH |
2792 | static const VMStateDescription vmstate_virtio_broken = { |
2793 | .name = "virtio/broken", | |
2794 | .version_id = 1, | |
2795 | .minimum_version_id = 1, | |
2796 | .needed = &virtio_broken_needed, | |
2797 | .fields = (VMStateField[]) { | |
2798 | VMSTATE_BOOL(broken, VirtIODevice), | |
2799 | VMSTATE_END_OF_LIST() | |
2800 | } | |
2801 | }; | |
2802 | ||
badaf79c XY |
2803 | static const VMStateDescription vmstate_virtio_started = { |
2804 | .name = "virtio/started", | |
2805 | .version_id = 1, | |
2806 | .minimum_version_id = 1, | |
2807 | .needed = &virtio_started_needed, | |
2808 | .fields = (VMStateField[]) { | |
2809 | VMSTATE_BOOL(started, VirtIODevice), | |
2810 | VMSTATE_END_OF_LIST() | |
2811 | } | |
2812 | }; | |
2813 | ||
9d7bd082 MR |
2814 | static const VMStateDescription vmstate_virtio_disabled = { |
2815 | .name = "virtio/disabled", | |
2816 | .version_id = 1, | |
2817 | .minimum_version_id = 1, | |
2818 | .needed = &virtio_disabled_needed, | |
2819 | .fields = (VMStateField[]) { | |
2820 | VMSTATE_BOOL(disabled, VirtIODevice), | |
2821 | VMSTATE_END_OF_LIST() | |
2822 | } | |
2823 | }; | |
2824 | ||
6b321a3d GK |
2825 | static const VMStateDescription vmstate_virtio = { |
2826 | .name = "virtio", | |
2827 | .version_id = 1, | |
2828 | .minimum_version_id = 1, | |
2829 | .minimum_version_id_old = 1, | |
2830 | .fields = (VMStateField[]) { | |
2831 | VMSTATE_END_OF_LIST() | |
616a6552 | 2832 | }, |
5cd8cada JQ |
2833 | .subsections = (const VMStateDescription*[]) { |
2834 | &vmstate_virtio_device_endian, | |
2835 | &vmstate_virtio_64bit_features, | |
74aae7b2 | 2836 | &vmstate_virtio_virtqueues, |
46c5d082 | 2837 | &vmstate_virtio_ringsize, |
791b1daf | 2838 | &vmstate_virtio_broken, |
a6df8adf | 2839 | &vmstate_virtio_extra_state, |
badaf79c | 2840 | &vmstate_virtio_started, |
86044b24 | 2841 | &vmstate_virtio_packed_virtqueues, |
9d7bd082 | 2842 | &vmstate_virtio_disabled, |
5cd8cada | 2843 | NULL |
6b321a3d GK |
2844 | } |
2845 | }; | |
2846 | ||
2f168d07 | 2847 | int virtio_save(VirtIODevice *vdev, QEMUFile *f) |
967f97fa | 2848 | { |
1c819449 FK |
2849 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
2850 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 2851 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
019a3edb | 2852 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); |
967f97fa AL |
2853 | int i; |
2854 | ||
1c819449 FK |
2855 | if (k->save_config) { |
2856 | k->save_config(qbus->parent, f); | |
2857 | } | |
967f97fa | 2858 | |
967f97fa AL |
2859 | qemu_put_8s(f, &vdev->status); |
2860 | qemu_put_8s(f, &vdev->isr); | |
2861 | qemu_put_be16s(f, &vdev->queue_sel); | |
019a3edb | 2862 | qemu_put_be32s(f, &guest_features_lo); |
967f97fa AL |
2863 | qemu_put_be32(f, vdev->config_len); |
2864 | qemu_put_buffer(f, vdev->config, vdev->config_len); | |
2865 | ||
87b3bd1c | 2866 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2867 | if (vdev->vq[i].vring.num == 0) |
2868 | break; | |
2869 | } | |
2870 | ||
2871 | qemu_put_be32(f, i); | |
2872 | ||
87b3bd1c | 2873 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
967f97fa AL |
2874 | if (vdev->vq[i].vring.num == 0) |
2875 | break; | |
2876 | ||
2877 | qemu_put_be32(f, vdev->vq[i].vring.num); | |
6ce69d1c PM |
2878 | if (k->has_variable_vring_alignment) { |
2879 | qemu_put_be32(f, vdev->vq[i].vring.align); | |
2880 | } | |
874adf45 SH |
2881 | /* |
2882 | * Save desc now, the rest of the ring addresses are saved in | |
2883 | * subsections for VIRTIO-1 devices. | |
2884 | */ | |
ab223c95 | 2885 | qemu_put_be64(f, vdev->vq[i].vring.desc); |
967f97fa | 2886 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
1c819449 FK |
2887 | if (k->save_queue) { |
2888 | k->save_queue(qbus->parent, i, f); | |
2889 | } | |
967f97fa | 2890 | } |
1b5fc0de GK |
2891 | |
2892 | if (vdc->save != NULL) { | |
2893 | vdc->save(vdev, f); | |
2894 | } | |
6b321a3d | 2895 | |
ea43e259 | 2896 | if (vdc->vmsd) { |
2f168d07 DDAG |
2897 | int ret = vmstate_save_state(f, vdc->vmsd, vdev, NULL); |
2898 | if (ret) { | |
2899 | return ret; | |
2900 | } | |
ea43e259 DDAG |
2901 | } |
2902 | ||
6b321a3d | 2903 | /* Subsections */ |
2f168d07 | 2904 | return vmstate_save_state(f, &vmstate_virtio, vdev, NULL); |
967f97fa AL |
2905 | } |
2906 | ||
1a665855 | 2907 | /* A wrapper for use as a VMState .put function */ |
2c21ee76 | 2908 | static int virtio_device_put(QEMUFile *f, void *opaque, size_t size, |
3ddba9a9 | 2909 | const VMStateField *field, JSONWriter *vmdesc) |
1a665855 | 2910 | { |
2f168d07 | 2911 | return virtio_save(VIRTIO_DEVICE(opaque), f); |
1a665855 HP |
2912 | } |
2913 | ||
2914 | /* A wrapper for use as a VMState .get function */ | |
2c21ee76 | 2915 | static int virtio_device_get(QEMUFile *f, void *opaque, size_t size, |
03fee66f | 2916 | const VMStateField *field) |
1a665855 HP |
2917 | { |
2918 | VirtIODevice *vdev = VIRTIO_DEVICE(opaque); | |
2919 | DeviceClass *dc = DEVICE_CLASS(VIRTIO_DEVICE_GET_CLASS(vdev)); | |
2920 | ||
2921 | return virtio_load(vdev, f, dc->vmsd->version_id); | |
2922 | } | |
2923 | ||
2924 | const VMStateInfo virtio_vmstate_info = { | |
2925 | .name = "virtio", | |
2926 | .get = virtio_device_get, | |
2927 | .put = virtio_device_put, | |
2928 | }; | |
2929 | ||
6c0196d7 | 2930 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) |
ad0c9332 | 2931 | { |
181103cd | 2932 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
6b8f1020 | 2933 | bool bad = (val & ~(vdev->host_features)) != 0; |
ad0c9332 | 2934 | |
6b8f1020 | 2935 | val &= vdev->host_features; |
181103cd FK |
2936 | if (k->set_features) { |
2937 | k->set_features(vdev, val); | |
ad0c9332 PB |
2938 | } |
2939 | vdev->guest_features = val; | |
2940 | return bad ? -1 : 0; | |
2941 | } | |
2942 | ||
6c0196d7 CH |
2943 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) |
2944 | { | |
db812c40 PB |
2945 | int ret; |
2946 | /* | |
6c0196d7 CH |
2947 | * The driver must not attempt to set features after feature negotiation |
2948 | * has finished. | |
2949 | */ | |
2950 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { | |
2951 | return -EINVAL; | |
2952 | } | |
db812c40 | 2953 | ret = virtio_set_features_nocheck(vdev, val); |
2d69eba5 LQ |
2954 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
2955 | /* VIRTIO_RING_F_EVENT_IDX changes the size of the caches. */ | |
2956 | int i; | |
2957 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
2958 | if (vdev->vq[i].vring.num != 0) { | |
2959 | virtio_init_region_cache(vdev, i); | |
db812c40 PB |
2960 | } |
2961 | } | |
2d69eba5 LQ |
2962 | } |
2963 | if (!ret) { | |
868a8f44 XY |
2964 | if (!virtio_device_started(vdev, vdev->status) && |
2965 | !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
2966 | vdev->start_on_kick = true; | |
2967 | } | |
db812c40 PB |
2968 | } |
2969 | return ret; | |
6c0196d7 CH |
2970 | } |
2971 | ||
4c21e353 | 2972 | size_t virtio_feature_get_config_size(const VirtIOFeature *feature_sizes, |
ba550851 SG |
2973 | uint64_t host_features) |
2974 | { | |
2975 | size_t config_size = 0; | |
2976 | int i; | |
2977 | ||
2978 | for (i = 0; feature_sizes[i].flags != 0; i++) { | |
2979 | if (host_features & feature_sizes[i].flags) { | |
2980 | config_size = MAX(feature_sizes[i].end, config_size); | |
2981 | } | |
2982 | } | |
2983 | ||
2984 | return config_size; | |
2985 | } | |
2986 | ||
1b5fc0de | 2987 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |
967f97fa | 2988 | { |
cc459952 | 2989 | int i, ret; |
a890a2f9 | 2990 | int32_t config_len; |
cc459952 | 2991 | uint32_t num; |
6d74ca5a | 2992 | uint32_t features; |
1c819449 FK |
2993 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
2994 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
1b5fc0de | 2995 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
967f97fa | 2996 | |
616a6552 GK |
2997 | /* |
2998 | * We poison the endianness to ensure it does not get used before | |
2999 | * subsections have been loaded. | |
3000 | */ | |
3001 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; | |
3002 | ||
1c819449 FK |
3003 | if (k->load_config) { |
3004 | ret = k->load_config(qbus->parent, f); | |
ff24bd58 MT |
3005 | if (ret) |
3006 | return ret; | |
3007 | } | |
967f97fa | 3008 | |
967f97fa AL |
3009 | qemu_get_8s(f, &vdev->status); |
3010 | qemu_get_8s(f, &vdev->isr); | |
3011 | qemu_get_be16s(f, &vdev->queue_sel); | |
87b3bd1c | 3012 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { |
4b53c2c7 MR |
3013 | return -1; |
3014 | } | |
6d74ca5a | 3015 | qemu_get_be32s(f, &features); |
ad0c9332 | 3016 | |
62cee1a2 MT |
3017 | /* |
3018 | * Temporarily set guest_features low bits - needed by | |
3019 | * virtio net load code testing for VIRTIO_NET_F_CTRL_GUEST_OFFLOADS | |
3020 | * VIRTIO_NET_F_GUEST_ANNOUNCE and VIRTIO_NET_F_CTRL_VQ. | |
3021 | * | |
3022 | * Note: devices should always test host features in future - don't create | |
3023 | * new dependencies like this. | |
3024 | */ | |
3025 | vdev->guest_features = features; | |
3026 | ||
a890a2f9 | 3027 | config_len = qemu_get_be32(f); |
2f5732e9 DDAG |
3028 | |
3029 | /* | |
3030 | * There are cases where the incoming config can be bigger or smaller | |
3031 | * than what we have; so load what we have space for, and skip | |
3032 | * any excess that's in the stream. | |
3033 | */ | |
3034 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); | |
3035 | ||
3036 | while (config_len > vdev->config_len) { | |
3037 | qemu_get_byte(f); | |
3038 | config_len--; | |
a890a2f9 | 3039 | } |
967f97fa AL |
3040 | |
3041 | num = qemu_get_be32(f); | |
3042 | ||
87b3bd1c | 3043 | if (num > VIRTIO_QUEUE_MAX) { |
8a1be662 | 3044 | error_report("Invalid number of virtqueues: 0x%x", num); |
cc459952 MT |
3045 | return -1; |
3046 | } | |
3047 | ||
967f97fa AL |
3048 | for (i = 0; i < num; i++) { |
3049 | vdev->vq[i].vring.num = qemu_get_be32(f); | |
6ce69d1c PM |
3050 | if (k->has_variable_vring_alignment) { |
3051 | vdev->vq[i].vring.align = qemu_get_be32(f); | |
3052 | } | |
ab223c95 | 3053 | vdev->vq[i].vring.desc = qemu_get_be64(f); |
967f97fa | 3054 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
bcbabae8 | 3055 | vdev->vq[i].signalled_used_valid = false; |
332fa82d | 3056 | vdev->vq[i].notification = true; |
967f97fa | 3057 | |
874adf45 | 3058 | if (!vdev->vq[i].vring.desc && vdev->vq[i].last_avail_idx) { |
1abeb5a6 | 3059 | error_report("VQ %d address 0x0 " |
6daf194d | 3060 | "inconsistent with Host index 0x%x", |
1abeb5a6 | 3061 | i, vdev->vq[i].last_avail_idx); |
874adf45 | 3062 | return -1; |
8275e2f6 | 3063 | } |
1c819449 FK |
3064 | if (k->load_queue) { |
3065 | ret = k->load_queue(qbus->parent, i, f); | |
ff24bd58 MT |
3066 | if (ret) |
3067 | return ret; | |
7055e687 | 3068 | } |
967f97fa AL |
3069 | } |
3070 | ||
7055e687 | 3071 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
1b5fc0de GK |
3072 | |
3073 | if (vdc->load != NULL) { | |
6b321a3d GK |
3074 | ret = vdc->load(vdev, f, version_id); |
3075 | if (ret) { | |
3076 | return ret; | |
3077 | } | |
1b5fc0de GK |
3078 | } |
3079 | ||
ea43e259 DDAG |
3080 | if (vdc->vmsd) { |
3081 | ret = vmstate_load_state(f, vdc->vmsd, vdev, version_id); | |
3082 | if (ret) { | |
3083 | return ret; | |
3084 | } | |
3085 | } | |
3086 | ||
616a6552 GK |
3087 | /* Subsections */ |
3088 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); | |
3089 | if (ret) { | |
3090 | return ret; | |
3091 | } | |
3092 | ||
3093 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { | |
3094 | vdev->device_endian = virtio_default_endian(); | |
3095 | } | |
3096 | ||
019a3edb GH |
3097 | if (virtio_64bit_features_needed(vdev)) { |
3098 | /* | |
3099 | * Subsection load filled vdev->guest_features. Run them | |
3100 | * through virtio_set_features to sanity-check them against | |
3101 | * host_features. | |
3102 | */ | |
3103 | uint64_t features64 = vdev->guest_features; | |
6c0196d7 | 3104 | if (virtio_set_features_nocheck(vdev, features64) < 0) { |
019a3edb GH |
3105 | error_report("Features 0x%" PRIx64 " unsupported. " |
3106 | "Allowed features: 0x%" PRIx64, | |
3107 | features64, vdev->host_features); | |
3108 | return -1; | |
3109 | } | |
3110 | } else { | |
6c0196d7 | 3111 | if (virtio_set_features_nocheck(vdev, features) < 0) { |
019a3edb GH |
3112 | error_report("Features 0x%x unsupported. " |
3113 | "Allowed features: 0x%" PRIx64, | |
3114 | features, vdev->host_features); | |
3115 | return -1; | |
3116 | } | |
3117 | } | |
3118 | ||
868a8f44 XY |
3119 | if (!virtio_device_started(vdev, vdev->status) && |
3120 | !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
3121 | vdev->start_on_kick = true; | |
3122 | } | |
3123 | ||
b5f53d04 | 3124 | RCU_READ_LOCK_GUARD(); |
616a6552 | 3125 | for (i = 0; i < num; i++) { |
ab223c95 | 3126 | if (vdev->vq[i].vring.desc) { |
616a6552 | 3127 | uint16_t nheads; |
874adf45 SH |
3128 | |
3129 | /* | |
3130 | * VIRTIO-1 devices migrate desc, used, and avail ring addresses so | |
3131 | * only the region cache needs to be set up. Legacy devices need | |
3132 | * to calculate used and avail ring addresses based on the desc | |
3133 | * address. | |
3134 | */ | |
3135 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
3136 | virtio_init_region_cache(vdev, i); | |
3137 | } else { | |
3138 | virtio_queue_update_rings(vdev, i); | |
3139 | } | |
3140 | ||
86044b24 JW |
3141 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3142 | vdev->vq[i].shadow_avail_idx = vdev->vq[i].last_avail_idx; | |
3143 | vdev->vq[i].shadow_avail_wrap_counter = | |
3144 | vdev->vq[i].last_avail_wrap_counter; | |
3145 | continue; | |
3146 | } | |
3147 | ||
616a6552 GK |
3148 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; |
3149 | /* Check it isn't doing strange things with descriptor numbers. */ | |
3150 | if (nheads > vdev->vq[i].vring.num) { | |
4aedda25 JL |
3151 | virtio_error(vdev, "VQ %d size 0x%x Guest index 0x%x " |
3152 | "inconsistent with Host index 0x%x: delta 0x%x", | |
3153 | i, vdev->vq[i].vring.num, | |
3154 | vring_avail_idx(&vdev->vq[i]), | |
3155 | vdev->vq[i].last_avail_idx, nheads); | |
3156 | vdev->vq[i].used_idx = 0; | |
3157 | vdev->vq[i].shadow_avail_idx = 0; | |
3158 | vdev->vq[i].inuse = 0; | |
3159 | continue; | |
616a6552 | 3160 | } |
b796fcd1 | 3161 | vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]); |
be1fea9b | 3162 | vdev->vq[i].shadow_avail_idx = vring_avail_idx(&vdev->vq[i]); |
bccdef6b SH |
3163 | |
3164 | /* | |
3165 | * Some devices migrate VirtQueueElements that have been popped | |
3166 | * from the avail ring but not yet returned to the used ring. | |
e66bcc40 HP |
3167 | * Since max ring size < UINT16_MAX it's safe to use modulo |
3168 | * UINT16_MAX + 1 subtraction. | |
bccdef6b | 3169 | */ |
e66bcc40 HP |
3170 | vdev->vq[i].inuse = (uint16_t)(vdev->vq[i].last_avail_idx - |
3171 | vdev->vq[i].used_idx); | |
bccdef6b SH |
3172 | if (vdev->vq[i].inuse > vdev->vq[i].vring.num) { |
3173 | error_report("VQ %d size 0x%x < last_avail_idx 0x%x - " | |
3174 | "used_idx 0x%x", | |
3175 | i, vdev->vq[i].vring.num, | |
3176 | vdev->vq[i].last_avail_idx, | |
3177 | vdev->vq[i].used_idx); | |
3178 | return -1; | |
3179 | } | |
616a6552 GK |
3180 | } |
3181 | } | |
3182 | ||
1dd71383 MT |
3183 | if (vdc->post_load) { |
3184 | ret = vdc->post_load(vdev); | |
3185 | if (ret) { | |
3186 | return ret; | |
3187 | } | |
3188 | } | |
3189 | ||
616a6552 | 3190 | return 0; |
967f97fa AL |
3191 | } |
3192 | ||
6a1a8cc7 | 3193 | void virtio_cleanup(VirtIODevice *vdev) |
b946a153 | 3194 | { |
85cf2a8d | 3195 | qemu_del_vm_change_state_handler(vdev->vmstate); |
8e05db92 FK |
3196 | } |
3197 | ||
538f0497 | 3198 | static void virtio_vmstate_change(void *opaque, bool running, RunState state) |
85cf2a8d MT |
3199 | { |
3200 | VirtIODevice *vdev = opaque; | |
1c819449 FK |
3201 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3202 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
e57f2c31 | 3203 | bool backend_run = running && virtio_device_started(vdev, vdev->status); |
9e8e8c48 | 3204 | vdev->vm_running = running; |
85cf2a8d MT |
3205 | |
3206 | if (backend_run) { | |
3207 | virtio_set_status(vdev, vdev->status); | |
3208 | } | |
3209 | ||
1c819449 FK |
3210 | if (k->vmstate_change) { |
3211 | k->vmstate_change(qbus->parent, backend_run); | |
85cf2a8d MT |
3212 | } |
3213 | ||
3214 | if (!backend_run) { | |
3215 | virtio_set_status(vdev, vdev->status); | |
3216 | } | |
3217 | } | |
3218 | ||
c8075caf GA |
3219 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
3220 | size_t vdev_size, const char *vdev_name) | |
3221 | { | |
3222 | DeviceState *vdev = data; | |
3223 | ||
9fc7fc4d MA |
3224 | object_initialize_child_with_props(proxy_obj, "virtio-backend", vdev, |
3225 | vdev_size, vdev_name, &error_abort, | |
3226 | NULL); | |
c8075caf GA |
3227 | qdev_alias_all_properties(vdev, proxy_obj); |
3228 | } | |
3229 | ||
8e05db92 FK |
3230 | void virtio_init(VirtIODevice *vdev, const char *name, |
3231 | uint16_t device_id, size_t config_size) | |
967f97fa | 3232 | { |
e0d686bf JW |
3233 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3234 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
b8193adb | 3235 | int i; |
e0d686bf JW |
3236 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; |
3237 | ||
3238 | if (nvectors) { | |
3239 | vdev->vector_queues = | |
3240 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); | |
3241 | } | |
3242 | ||
868a8f44 | 3243 | vdev->start_on_kick = false; |
badaf79c | 3244 | vdev->started = false; |
53c25cea | 3245 | vdev->device_id = device_id; |
967f97fa | 3246 | vdev->status = 0; |
d73415a3 | 3247 | qatomic_set(&vdev->isr, 0); |
967f97fa | 3248 | vdev->queue_sel = 0; |
7055e687 | 3249 | vdev->config_vector = VIRTIO_NO_VECTOR; |
87b3bd1c | 3250 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); |
1354869c | 3251 | vdev->vm_running = runstate_is_running(); |
f5ed3663 | 3252 | vdev->broken = false; |
87b3bd1c | 3253 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
b8193adb | 3254 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
1cbdabe2 | 3255 | vdev->vq[i].vdev = vdev; |
e78a2b42 | 3256 | vdev->vq[i].queue_index = i; |
fcccb271 | 3257 | vdev->vq[i].host_notifier_enabled = false; |
1cbdabe2 | 3258 | } |
967f97fa | 3259 | |
967f97fa AL |
3260 | vdev->name = name; |
3261 | vdev->config_len = config_size; | |
8e05db92 | 3262 | if (vdev->config_len) { |
7267c094 | 3263 | vdev->config = g_malloc0(config_size); |
8e05db92 | 3264 | } else { |
967f97fa | 3265 | vdev->config = NULL; |
8e05db92 | 3266 | } |
1a8c091c SH |
3267 | vdev->vmstate = qdev_add_vm_change_state_handler(DEVICE(vdev), |
3268 | virtio_vmstate_change, vdev); | |
616a6552 | 3269 | vdev->device_endian = virtio_default_endian(); |
5669655a | 3270 | vdev->use_guest_notifier_mask = true; |
8e05db92 | 3271 | } |
967f97fa | 3272 | |
7c78bdd7 CH |
3273 | /* |
3274 | * Only devices that have already been around prior to defining the virtio | |
3275 | * standard support legacy mode; this includes devices not specified in the | |
3276 | * standard. All newer devices conform to the virtio standard only. | |
3277 | */ | |
3278 | bool virtio_legacy_allowed(VirtIODevice *vdev) | |
3279 | { | |
3280 | switch (vdev->device_id) { | |
3281 | case VIRTIO_ID_NET: | |
3282 | case VIRTIO_ID_BLOCK: | |
3283 | case VIRTIO_ID_CONSOLE: | |
3284 | case VIRTIO_ID_RNG: | |
3285 | case VIRTIO_ID_BALLOON: | |
3286 | case VIRTIO_ID_RPMSG: | |
3287 | case VIRTIO_ID_SCSI: | |
3288 | case VIRTIO_ID_9P: | |
3289 | case VIRTIO_ID_RPROC_SERIAL: | |
3290 | case VIRTIO_ID_CAIF: | |
3291 | return true; | |
3292 | default: | |
3293 | return false; | |
3294 | } | |
3295 | } | |
3296 | ||
d55f5182 SG |
3297 | bool virtio_legacy_check_disabled(VirtIODevice *vdev) |
3298 | { | |
3299 | return vdev->disable_legacy_check; | |
3300 | } | |
3301 | ||
a8170e5e | 3302 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3303 | { |
3304 | return vdev->vq[n].vring.desc; | |
3305 | } | |
3306 | ||
0c9753eb LV |
3307 | bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n) |
3308 | { | |
3309 | return virtio_queue_get_desc_addr(vdev, n) != 0; | |
3310 | } | |
3311 | ||
23bfaf77 JW |
3312 | bool virtio_queue_enabled(VirtIODevice *vdev, int n) |
3313 | { | |
b2a5f62a JW |
3314 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
3315 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
3316 | ||
3317 | if (k->queue_enabled) { | |
3318 | return k->queue_enabled(qbus->parent, n); | |
3319 | } | |
0c9753eb | 3320 | return virtio_queue_enabled_legacy(vdev, n); |
23bfaf77 JW |
3321 | } |
3322 | ||
a8170e5e | 3323 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3324 | { |
3325 | return vdev->vq[n].vring.avail; | |
3326 | } | |
3327 | ||
a8170e5e | 3328 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3329 | { |
3330 | return vdev->vq[n].vring.used; | |
3331 | } | |
3332 | ||
a8170e5e | 3333 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) |
1cbdabe2 MT |
3334 | { |
3335 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; | |
3336 | } | |
3337 | ||
a8170e5e | 3338 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) |
1cbdabe2 | 3339 | { |
f90cda63 WX |
3340 | int s; |
3341 | ||
86044b24 JW |
3342 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3343 | return sizeof(struct VRingPackedDescEvent); | |
3344 | } | |
3345 | ||
f90cda63 | 3346 | s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; |
1cbdabe2 | 3347 | return offsetof(VRingAvail, ring) + |
f90cda63 | 3348 | sizeof(uint16_t) * vdev->vq[n].vring.num + s; |
1cbdabe2 MT |
3349 | } |
3350 | ||
a8170e5e | 3351 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) |
1cbdabe2 | 3352 | { |
f90cda63 WX |
3353 | int s; |
3354 | ||
86044b24 JW |
3355 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3356 | return sizeof(struct VRingPackedDescEvent); | |
3357 | } | |
3358 | ||
f90cda63 | 3359 | s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; |
1cbdabe2 | 3360 | return offsetof(VRingUsed, ring) + |
f90cda63 | 3361 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num + s; |
1cbdabe2 MT |
3362 | } |
3363 | ||
86044b24 JW |
3364 | static unsigned int virtio_queue_packed_get_last_avail_idx(VirtIODevice *vdev, |
3365 | int n) | |
3366 | { | |
3367 | unsigned int avail, used; | |
3368 | ||
3369 | avail = vdev->vq[n].last_avail_idx; | |
3370 | avail |= ((uint16_t)vdev->vq[n].last_avail_wrap_counter) << 15; | |
3371 | ||
3372 | used = vdev->vq[n].used_idx; | |
3373 | used |= ((uint16_t)vdev->vq[n].used_wrap_counter) << 15; | |
3374 | ||
3375 | return avail | used << 16; | |
3376 | } | |
3377 | ||
3378 | static uint16_t virtio_queue_split_get_last_avail_idx(VirtIODevice *vdev, | |
3379 | int n) | |
1cbdabe2 MT |
3380 | { |
3381 | return vdev->vq[n].last_avail_idx; | |
3382 | } | |
3383 | ||
86044b24 | 3384 | unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) |
1cbdabe2 | 3385 | { |
86044b24 JW |
3386 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
3387 | return virtio_queue_packed_get_last_avail_idx(vdev, n); | |
3388 | } else { | |
3389 | return virtio_queue_split_get_last_avail_idx(vdev, n); | |
3390 | } | |
1cbdabe2 MT |
3391 | } |
3392 | ||
86044b24 JW |
3393 | static void virtio_queue_packed_set_last_avail_idx(VirtIODevice *vdev, |
3394 | int n, unsigned int idx) | |
3395 | { | |
3396 | struct VirtQueue *vq = &vdev->vq[n]; | |
3397 | ||
3398 | vq->last_avail_idx = vq->shadow_avail_idx = idx & 0x7fff; | |
3399 | vq->last_avail_wrap_counter = | |
3400 | vq->shadow_avail_wrap_counter = !!(idx & 0x8000); | |
3401 | idx >>= 16; | |
3402 | vq->used_idx = idx & 0x7ffff; | |
3403 | vq->used_wrap_counter = !!(idx & 0x8000); | |
3404 | } | |
3405 | ||
3406 | static void virtio_queue_split_set_last_avail_idx(VirtIODevice *vdev, | |
3407 | int n, unsigned int idx) | |
3408 | { | |
3409 | vdev->vq[n].last_avail_idx = idx; | |
3410 | vdev->vq[n].shadow_avail_idx = idx; | |
3411 | } | |
3412 | ||
3413 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, | |
3414 | unsigned int idx) | |
3415 | { | |
3416 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3417 | virtio_queue_packed_set_last_avail_idx(vdev, n, idx); | |
3418 | } else { | |
3419 | virtio_queue_split_set_last_avail_idx(vdev, n, idx); | |
3420 | } | |
3421 | } | |
3422 | ||
3423 | static void virtio_queue_packed_restore_last_avail_idx(VirtIODevice *vdev, | |
3424 | int n) | |
3425 | { | |
3426 | /* We don't have a reference like avail idx in shared memory */ | |
3427 | return; | |
3428 | } | |
3429 | ||
3430 | static void virtio_queue_split_restore_last_avail_idx(VirtIODevice *vdev, | |
3431 | int n) | |
2d4ba6cc | 3432 | { |
b5f53d04 | 3433 | RCU_READ_LOCK_GUARD(); |
2d4ba6cc MC |
3434 | if (vdev->vq[n].vring.desc) { |
3435 | vdev->vq[n].last_avail_idx = vring_used_idx(&vdev->vq[n]); | |
3436 | vdev->vq[n].shadow_avail_idx = vdev->vq[n].last_avail_idx; | |
3437 | } | |
2d4ba6cc MC |
3438 | } |
3439 | ||
86044b24 JW |
3440 | void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n) |
3441 | { | |
3442 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3443 | virtio_queue_packed_restore_last_avail_idx(vdev, n); | |
3444 | } else { | |
3445 | virtio_queue_split_restore_last_avail_idx(vdev, n); | |
3446 | } | |
3447 | } | |
3448 | ||
3449 | static void virtio_queue_packed_update_used_idx(VirtIODevice *vdev, int n) | |
3450 | { | |
3451 | /* used idx was updated through set_last_avail_idx() */ | |
3452 | return; | |
3453 | } | |
3454 | ||
3455 | static void virtio_split_packed_update_used_idx(VirtIODevice *vdev, int n) | |
312d3b35 | 3456 | { |
b5f53d04 | 3457 | RCU_READ_LOCK_GUARD(); |
ca0176ad PB |
3458 | if (vdev->vq[n].vring.desc) { |
3459 | vdev->vq[n].used_idx = vring_used_idx(&vdev->vq[n]); | |
3460 | } | |
312d3b35 YB |
3461 | } |
3462 | ||
86044b24 JW |
3463 | void virtio_queue_update_used_idx(VirtIODevice *vdev, int n) |
3464 | { | |
3465 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { | |
3466 | return virtio_queue_packed_update_used_idx(vdev, n); | |
3467 | } else { | |
3468 | return virtio_split_packed_update_used_idx(vdev, n); | |
3469 | } | |
3470 | } | |
3471 | ||
6793dfd1 SH |
3472 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) |
3473 | { | |
3474 | vdev->vq[n].signalled_used_valid = false; | |
3475 | } | |
3476 | ||
1cbdabe2 MT |
3477 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) |
3478 | { | |
3479 | return vdev->vq + n; | |
3480 | } | |
3481 | ||
e78a2b42 JW |
3482 | uint16_t virtio_get_queue_index(VirtQueue *vq) |
3483 | { | |
3484 | return vq->queue_index; | |
3485 | } | |
3486 | ||
15b2bd18 PB |
3487 | static void virtio_queue_guest_notifier_read(EventNotifier *n) |
3488 | { | |
3489 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); | |
3490 | if (event_notifier_test_and_clear(n)) { | |
b4b9862b | 3491 | virtio_irq(vq); |
15b2bd18 PB |
3492 | } |
3493 | } | |
3494 | ||
3495 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, | |
3496 | bool with_irqfd) | |
3497 | { | |
3498 | if (assign && !with_irqfd) { | |
d6da1e9e | 3499 | event_notifier_set_handler(&vq->guest_notifier, |
15b2bd18 PB |
3500 | virtio_queue_guest_notifier_read); |
3501 | } else { | |
d6da1e9e | 3502 | event_notifier_set_handler(&vq->guest_notifier, NULL); |
15b2bd18 PB |
3503 | } |
3504 | if (!assign) { | |
3505 | /* Test and clear notifier before closing it, | |
3506 | * in case poll callback didn't have time to run. */ | |
3507 | virtio_queue_guest_notifier_read(&vq->guest_notifier); | |
3508 | } | |
3509 | } | |
3510 | ||
1cbdabe2 MT |
3511 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
3512 | { | |
3513 | return &vq->guest_notifier; | |
3514 | } | |
b1f416aa | 3515 | |
344dc16f | 3516 | static void virtio_queue_host_notifier_aio_read(EventNotifier *n) |
b1f416aa PB |
3517 | { |
3518 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3519 | if (event_notifier_test_and_clear(n)) { | |
344dc16f | 3520 | virtio_queue_notify_aio_vq(vq); |
b1f416aa PB |
3521 | } |
3522 | } | |
3523 | ||
a7c8215e SH |
3524 | static void virtio_queue_host_notifier_aio_poll_begin(EventNotifier *n) |
3525 | { | |
3526 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3527 | ||
3528 | virtio_queue_set_notification(vq, 0); | |
3529 | } | |
3530 | ||
0062ea0f SH |
3531 | static bool virtio_queue_host_notifier_aio_poll(void *opaque) |
3532 | { | |
3533 | EventNotifier *n = opaque; | |
3534 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3535 | ||
dd3dd4ba | 3536 | if (!vq->vring.desc || virtio_queue_empty(vq)) { |
0062ea0f SH |
3537 | return false; |
3538 | } | |
3539 | ||
d0435bc5 | 3540 | return virtio_queue_notify_aio_vq(vq); |
0062ea0f SH |
3541 | } |
3542 | ||
a7c8215e SH |
3543 | static void virtio_queue_host_notifier_aio_poll_end(EventNotifier *n) |
3544 | { | |
3545 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3546 | ||
3547 | /* Caller polls once more after this to catch requests that race with us */ | |
3548 | virtio_queue_set_notification(vq, 1); | |
3549 | } | |
3550 | ||
a1afb606 | 3551 | void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, |
07931698 | 3552 | VirtIOHandleAIOOutput handle_output) |
a1afb606 | 3553 | { |
a378b49a PB |
3554 | if (handle_output) { |
3555 | vq->handle_aio_output = handle_output; | |
a1afb606 | 3556 | aio_set_event_notifier(ctx, &vq->host_notifier, true, |
0062ea0f SH |
3557 | virtio_queue_host_notifier_aio_read, |
3558 | virtio_queue_host_notifier_aio_poll); | |
a7c8215e SH |
3559 | aio_set_event_notifier_poll(ctx, &vq->host_notifier, |
3560 | virtio_queue_host_notifier_aio_poll_begin, | |
3561 | virtio_queue_host_notifier_aio_poll_end); | |
a1afb606 | 3562 | } else { |
f6a51c84 | 3563 | aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL, NULL); |
a1afb606 PB |
3564 | /* Test and clear notifier before after disabling event, |
3565 | * in case poll callback didn't have time to run. */ | |
344dc16f | 3566 | virtio_queue_host_notifier_aio_read(&vq->host_notifier); |
a378b49a | 3567 | vq->handle_aio_output = NULL; |
344dc16f MT |
3568 | } |
3569 | } | |
3570 | ||
fa283a4a | 3571 | void virtio_queue_host_notifier_read(EventNotifier *n) |
344dc16f MT |
3572 | { |
3573 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); | |
3574 | if (event_notifier_test_and_clear(n)) { | |
3575 | virtio_queue_notify_vq(vq); | |
a1afb606 PB |
3576 | } |
3577 | } | |
3578 | ||
1cbdabe2 MT |
3579 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
3580 | { | |
3581 | return &vq->host_notifier; | |
3582 | } | |
8e05db92 | 3583 | |
fcccb271 SH |
3584 | void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled) |
3585 | { | |
3586 | vq->host_notifier_enabled = enabled; | |
3587 | } | |
3588 | ||
6f80e617 TB |
3589 | int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n, |
3590 | MemoryRegion *mr, bool assign) | |
3591 | { | |
3592 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3593 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
3594 | ||
3595 | if (k->set_host_notifier_mr) { | |
3596 | return k->set_host_notifier_mr(qbus->parent, n, mr, assign); | |
3597 | } | |
3598 | ||
3599 | return -1; | |
3600 | } | |
3601 | ||
1034e9cf FK |
3602 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) |
3603 | { | |
9e288406 | 3604 | g_free(vdev->bus_name); |
80e0090a | 3605 | vdev->bus_name = g_strdup(bus_name); |
1034e9cf FK |
3606 | } |
3607 | ||
f5ed3663 SH |
3608 | void GCC_FMT_ATTR(2, 3) virtio_error(VirtIODevice *vdev, const char *fmt, ...) |
3609 | { | |
3610 | va_list ap; | |
3611 | ||
3612 | va_start(ap, fmt); | |
3613 | error_vreport(fmt, ap); | |
3614 | va_end(ap); | |
3615 | ||
f5ed3663 | 3616 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
8fc47c87 | 3617 | vdev->status = vdev->status | VIRTIO_CONFIG_S_NEEDS_RESET; |
f5ed3663 SH |
3618 | virtio_notify_config(vdev); |
3619 | } | |
66453cff GK |
3620 | |
3621 | vdev->broken = true; | |
f5ed3663 SH |
3622 | } |
3623 | ||
c611c764 PB |
3624 | static void virtio_memory_listener_commit(MemoryListener *listener) |
3625 | { | |
3626 | VirtIODevice *vdev = container_of(listener, VirtIODevice, listener); | |
3627 | int i; | |
3628 | ||
3629 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
3630 | if (vdev->vq[i].vring.num == 0) { | |
3631 | break; | |
3632 | } | |
3633 | virtio_init_region_cache(vdev, i); | |
3634 | } | |
3635 | } | |
3636 | ||
1d244b42 AF |
3637 | static void virtio_device_realize(DeviceState *dev, Error **errp) |
3638 | { | |
3639 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
3640 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); | |
3641 | Error *err = NULL; | |
3642 | ||
ea43e259 DDAG |
3643 | /* Devices should either use vmsd or the load/save methods */ |
3644 | assert(!vdc->vmsd || !vdc->load); | |
3645 | ||
1d244b42 AF |
3646 | if (vdc->realize != NULL) { |
3647 | vdc->realize(dev, &err); | |
3648 | if (err != NULL) { | |
3649 | error_propagate(errp, err); | |
3650 | return; | |
3651 | } | |
8e05db92 | 3652 | } |
e8398045 JW |
3653 | |
3654 | virtio_bus_device_plugged(vdev, &err); | |
3655 | if (err != NULL) { | |
3656 | error_propagate(errp, err); | |
b69c3c21 | 3657 | vdc->unrealize(dev); |
e8398045 JW |
3658 | return; |
3659 | } | |
c611c764 PB |
3660 | |
3661 | vdev->listener.commit = virtio_memory_listener_commit; | |
142518bd | 3662 | vdev->listener.name = "virtio"; |
c611c764 | 3663 | memory_listener_register(&vdev->listener, vdev->dma_as); |
8e05db92 FK |
3664 | } |
3665 | ||
b69c3c21 | 3666 | static void virtio_device_unrealize(DeviceState *dev) |
1034e9cf | 3667 | { |
1d244b42 | 3668 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
306ec6c3 | 3669 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
1d244b42 | 3670 | |
f6ab64c0 | 3671 | memory_listener_unregister(&vdev->listener); |
83d07047 PB |
3672 | virtio_bus_device_unplugged(vdev); |
3673 | ||
306ec6c3 | 3674 | if (vdc->unrealize != NULL) { |
b69c3c21 | 3675 | vdc->unrealize(dev); |
5e96f5d2 | 3676 | } |
1d244b42 | 3677 | |
9e288406 MA |
3678 | g_free(vdev->bus_name); |
3679 | vdev->bus_name = NULL; | |
1034e9cf FK |
3680 | } |
3681 | ||
c611c764 PB |
3682 | static void virtio_device_free_virtqueues(VirtIODevice *vdev) |
3683 | { | |
3684 | int i; | |
3685 | if (!vdev->vq) { | |
3686 | return; | |
3687 | } | |
3688 | ||
3689 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { | |
c611c764 PB |
3690 | if (vdev->vq[i].vring.num == 0) { |
3691 | break; | |
3692 | } | |
e0e2d644 | 3693 | virtio_virtqueue_reset_region_cache(&vdev->vq[i]); |
c611c764 PB |
3694 | } |
3695 | g_free(vdev->vq); | |
3696 | } | |
3697 | ||
3698 | static void virtio_device_instance_finalize(Object *obj) | |
3699 | { | |
3700 | VirtIODevice *vdev = VIRTIO_DEVICE(obj); | |
3701 | ||
c611c764 PB |
3702 | virtio_device_free_virtqueues(vdev); |
3703 | ||
3704 | g_free(vdev->config); | |
3705 | g_free(vdev->vector_queues); | |
3706 | } | |
3707 | ||
6b8f1020 CH |
3708 | static Property virtio_properties[] = { |
3709 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), | |
e57f2c31 | 3710 | DEFINE_PROP_BOOL("use-started", VirtIODevice, use_started, true), |
9d7bd082 | 3711 | DEFINE_PROP_BOOL("use-disabled-flag", VirtIODevice, use_disabled_flag, true), |
d55f5182 SG |
3712 | DEFINE_PROP_BOOL("x-disable-legacy-check", VirtIODevice, |
3713 | disable_legacy_check, false), | |
6b8f1020 CH |
3714 | DEFINE_PROP_END_OF_LIST(), |
3715 | }; | |
3716 | ||
ff4c07df PB |
3717 | static int virtio_device_start_ioeventfd_impl(VirtIODevice *vdev) |
3718 | { | |
3719 | VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); | |
710fccf8 | 3720 | int i, n, r, err; |
ff4c07df | 3721 | |
9cf4fd87 GK |
3722 | /* |
3723 | * Batch all the host notifiers in a single transaction to avoid | |
3724 | * quadratic time complexity in address_space_update_ioeventfds(). | |
3725 | */ | |
710fccf8 | 3726 | memory_region_transaction_begin(); |
ff4c07df | 3727 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
fa283a4a | 3728 | VirtQueue *vq = &vdev->vq[n]; |
ff4c07df PB |
3729 | if (!virtio_queue_get_num(vdev, n)) { |
3730 | continue; | |
3731 | } | |
ed08a2a0 | 3732 | r = virtio_bus_set_host_notifier(qbus, n, true); |
ff4c07df PB |
3733 | if (r < 0) { |
3734 | err = r; | |
3735 | goto assign_error; | |
3736 | } | |
d6da1e9e | 3737 | event_notifier_set_handler(&vq->host_notifier, |
fa283a4a | 3738 | virtio_queue_host_notifier_read); |
6019f3b9 PB |
3739 | } |
3740 | ||
3741 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { | |
3742 | /* Kick right away to begin processing requests already in vring */ | |
3743 | VirtQueue *vq = &vdev->vq[n]; | |
3744 | if (!vq->vring.num) { | |
3745 | continue; | |
3746 | } | |
3747 | event_notifier_set(&vq->host_notifier); | |
ff4c07df | 3748 | } |
710fccf8 | 3749 | memory_region_transaction_commit(); |
ff4c07df PB |
3750 | return 0; |
3751 | ||
3752 | assign_error: | |
710fccf8 | 3753 | i = n; /* save n for a second iteration after transaction is committed. */ |
ff4c07df | 3754 | while (--n >= 0) { |
fa283a4a | 3755 | VirtQueue *vq = &vdev->vq[n]; |
ff4c07df PB |
3756 | if (!virtio_queue_get_num(vdev, n)) { |
3757 | continue; | |
3758 | } | |
3759 | ||
d6da1e9e | 3760 | event_notifier_set_handler(&vq->host_notifier, NULL); |
ed08a2a0 | 3761 | r = virtio_bus_set_host_notifier(qbus, n, false); |
ff4c07df | 3762 | assert(r >= 0); |
710fccf8 | 3763 | } |
9cf4fd87 GK |
3764 | /* |
3765 | * The transaction expects the ioeventfds to be open when it | |
3766 | * commits. Do it now, before the cleanup loop. | |
3767 | */ | |
710fccf8 GH |
3768 | memory_region_transaction_commit(); |
3769 | ||
3770 | while (--i >= 0) { | |
3771 | if (!virtio_queue_get_num(vdev, i)) { | |
3772 | continue; | |
3773 | } | |
3774 | virtio_bus_cleanup_host_notifier(qbus, i); | |
ff4c07df PB |
3775 | } |
3776 | return err; | |
3777 | } | |
3778 | ||
3779 | int virtio_device_start_ioeventfd(VirtIODevice *vdev) | |
3780 | { | |
3781 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3782 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3783 | ||
3784 | return virtio_bus_start_ioeventfd(vbus); | |
3785 | } | |
3786 | ||
3787 | static void virtio_device_stop_ioeventfd_impl(VirtIODevice *vdev) | |
3788 | { | |
3789 | VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); | |
ff4c07df PB |
3790 | int n, r; |
3791 | ||
9cf4fd87 GK |
3792 | /* |
3793 | * Batch all the host notifiers in a single transaction to avoid | |
3794 | * quadratic time complexity in address_space_update_ioeventfds(). | |
3795 | */ | |
710fccf8 | 3796 | memory_region_transaction_begin(); |
ff4c07df | 3797 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
fa283a4a PB |
3798 | VirtQueue *vq = &vdev->vq[n]; |
3799 | ||
ff4c07df PB |
3800 | if (!virtio_queue_get_num(vdev, n)) { |
3801 | continue; | |
3802 | } | |
d6da1e9e | 3803 | event_notifier_set_handler(&vq->host_notifier, NULL); |
ed08a2a0 | 3804 | r = virtio_bus_set_host_notifier(qbus, n, false); |
ff4c07df | 3805 | assert(r >= 0); |
710fccf8 | 3806 | } |
9cf4fd87 GK |
3807 | /* |
3808 | * The transaction expects the ioeventfds to be open when it | |
3809 | * commits. Do it now, before the cleanup loop. | |
3810 | */ | |
710fccf8 GH |
3811 | memory_region_transaction_commit(); |
3812 | ||
3813 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { | |
3814 | if (!virtio_queue_get_num(vdev, n)) { | |
3815 | continue; | |
3816 | } | |
76143618 | 3817 | virtio_bus_cleanup_host_notifier(qbus, n); |
ff4c07df PB |
3818 | } |
3819 | } | |
3820 | ||
310837de PB |
3821 | int virtio_device_grab_ioeventfd(VirtIODevice *vdev) |
3822 | { | |
3823 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3824 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3825 | ||
3826 | return virtio_bus_grab_ioeventfd(vbus); | |
3827 | } | |
3828 | ||
3829 | void virtio_device_release_ioeventfd(VirtIODevice *vdev) | |
3830 | { | |
3831 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3832 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3833 | ||
3834 | virtio_bus_release_ioeventfd(vbus); | |
3835 | } | |
3836 | ||
8e05db92 FK |
3837 | static void virtio_device_class_init(ObjectClass *klass, void *data) |
3838 | { | |
3839 | /* Set the default value here. */ | |
ff4c07df | 3840 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
8e05db92 | 3841 | DeviceClass *dc = DEVICE_CLASS(klass); |
1d244b42 AF |
3842 | |
3843 | dc->realize = virtio_device_realize; | |
3844 | dc->unrealize = virtio_device_unrealize; | |
8e05db92 | 3845 | dc->bus_type = TYPE_VIRTIO_BUS; |
4f67d30b | 3846 | device_class_set_props(dc, virtio_properties); |
ff4c07df PB |
3847 | vdc->start_ioeventfd = virtio_device_start_ioeventfd_impl; |
3848 | vdc->stop_ioeventfd = virtio_device_stop_ioeventfd_impl; | |
9b706dbb MT |
3849 | |
3850 | vdc->legacy_features |= VIRTIO_LEGACY_FEATURES; | |
8e05db92 FK |
3851 | } |
3852 | ||
8e93cef1 PB |
3853 | bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev) |
3854 | { | |
3855 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); | |
3856 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
3857 | ||
3858 | return virtio_bus_ioeventfd_enabled(vbus); | |
3859 | } | |
3860 | ||
8e05db92 FK |
3861 | static const TypeInfo virtio_device_info = { |
3862 | .name = TYPE_VIRTIO_DEVICE, | |
3863 | .parent = TYPE_DEVICE, | |
3864 | .instance_size = sizeof(VirtIODevice), | |
3865 | .class_init = virtio_device_class_init, | |
c611c764 | 3866 | .instance_finalize = virtio_device_instance_finalize, |
8e05db92 FK |
3867 | .abstract = true, |
3868 | .class_size = sizeof(VirtioDeviceClass), | |
3869 | }; | |
3870 | ||
3871 | static void virtio_register_types(void) | |
3872 | { | |
3873 | type_register_static(&virtio_device_info); | |
3874 | } | |
3875 | ||
3876 | type_init(virtio_register_types) |