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Commit | Line | Data |
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d5970055 MT |
1 | /* |
2 | * vhost support | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Michael S. Tsirkin <mst@redhat.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. | |
6b620ca3 PB |
11 | * |
12 | * Contributions after 2012-01-13 are licensed under the terms of the | |
13 | * GNU GPL, version 2 or (at your option) any later version. | |
d5970055 MT |
14 | */ |
15 | ||
9b8bfe21 | 16 | #include "qemu/osdep.h" |
da34e65c | 17 | #include "qapi/error.h" |
0d09e41a | 18 | #include "hw/virtio/vhost.h" |
d5970055 | 19 | #include "hw/hw.h" |
5444e768 | 20 | #include "qemu/atomic.h" |
1de7afc9 | 21 | #include "qemu/range.h" |
04b7a152 | 22 | #include "qemu/error-report.h" |
15324404 | 23 | #include "qemu/memfd.h" |
11078ae3 | 24 | #include <linux/vhost.h> |
022c62cb | 25 | #include "exec/address-spaces.h" |
1c819449 | 26 | #include "hw/virtio/virtio-bus.h" |
04b7a152 | 27 | #include "hw/virtio/virtio-access.h" |
795c40b8 | 28 | #include "migration/blocker.h" |
c471ad0e | 29 | #include "sysemu/dma.h" |
d5970055 | 30 | |
162bba7f MAL |
31 | /* enabled until disconnected backend stabilizes */ |
32 | #define _VHOST_DEBUG 1 | |
33 | ||
34 | #ifdef _VHOST_DEBUG | |
35 | #define VHOST_OPS_DEBUG(fmt, ...) \ | |
36 | do { error_report(fmt ": %s (%d)", ## __VA_ARGS__, \ | |
37 | strerror(errno), errno); } while (0) | |
38 | #else | |
39 | #define VHOST_OPS_DEBUG(fmt, ...) \ | |
40 | do { } while (0) | |
41 | #endif | |
42 | ||
309750fa | 43 | static struct vhost_log *vhost_log; |
15324404 | 44 | static struct vhost_log *vhost_log_shm; |
309750fa | 45 | |
2ce68e4c IM |
46 | static unsigned int used_memslots; |
47 | static QLIST_HEAD(, vhost_dev) vhost_devices = | |
48 | QLIST_HEAD_INITIALIZER(vhost_devices); | |
49 | ||
50 | bool vhost_has_free_slot(void) | |
51 | { | |
52 | unsigned int slots_limit = ~0U; | |
53 | struct vhost_dev *hdev; | |
54 | ||
55 | QLIST_FOREACH(hdev, &vhost_devices, entry) { | |
56 | unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); | |
57 | slots_limit = MIN(slots_limit, r); | |
58 | } | |
59 | return slots_limit > used_memslots; | |
60 | } | |
61 | ||
d5970055 | 62 | static void vhost_dev_sync_region(struct vhost_dev *dev, |
2817b260 | 63 | MemoryRegionSection *section, |
d5970055 MT |
64 | uint64_t mfirst, uint64_t mlast, |
65 | uint64_t rfirst, uint64_t rlast) | |
66 | { | |
309750fa JW |
67 | vhost_log_chunk_t *log = dev->log->log; |
68 | ||
d5970055 MT |
69 | uint64_t start = MAX(mfirst, rfirst); |
70 | uint64_t end = MIN(mlast, rlast); | |
309750fa JW |
71 | vhost_log_chunk_t *from = log + start / VHOST_LOG_CHUNK; |
72 | vhost_log_chunk_t *to = log + end / VHOST_LOG_CHUNK + 1; | |
33c5793b | 73 | uint64_t addr = QEMU_ALIGN_DOWN(start, VHOST_LOG_CHUNK); |
d5970055 | 74 | |
d5970055 MT |
75 | if (end < start) { |
76 | return; | |
77 | } | |
e314672a | 78 | assert(end / VHOST_LOG_CHUNK < dev->log_size); |
fbbaf9ae | 79 | assert(start / VHOST_LOG_CHUNK < dev->log_size); |
e314672a | 80 | |
d5970055 MT |
81 | for (;from < to; ++from) { |
82 | vhost_log_chunk_t log; | |
d5970055 MT |
83 | /* We first check with non-atomic: much cheaper, |
84 | * and we expect non-dirty to be the common case. */ | |
85 | if (!*from) { | |
0c600ce2 | 86 | addr += VHOST_LOG_CHUNK; |
d5970055 MT |
87 | continue; |
88 | } | |
5444e768 PB |
89 | /* Data must be read atomically. We don't really need barrier semantics |
90 | * but it's easier to use atomic_* than roll our own. */ | |
91 | log = atomic_xchg(from, 0); | |
747eb78b NC |
92 | while (log) { |
93 | int bit = ctzl(log); | |
6b37a23d MT |
94 | hwaddr page_addr; |
95 | hwaddr section_offset; | |
96 | hwaddr mr_offset; | |
6b37a23d MT |
97 | page_addr = addr + bit * VHOST_LOG_PAGE; |
98 | section_offset = page_addr - section->offset_within_address_space; | |
99 | mr_offset = section_offset + section->offset_within_region; | |
100 | memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); | |
d5970055 MT |
101 | log &= ~(0x1ull << bit); |
102 | } | |
103 | addr += VHOST_LOG_CHUNK; | |
104 | } | |
105 | } | |
106 | ||
04097f7c | 107 | static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
2817b260 | 108 | MemoryRegionSection *section, |
6b37a23d MT |
109 | hwaddr first, |
110 | hwaddr last) | |
d5970055 | 111 | { |
d5970055 | 112 | int i; |
6b37a23d MT |
113 | hwaddr start_addr; |
114 | hwaddr end_addr; | |
04097f7c | 115 | |
d5970055 MT |
116 | if (!dev->log_enabled || !dev->started) { |
117 | return 0; | |
118 | } | |
6b37a23d | 119 | start_addr = section->offset_within_address_space; |
052e87b0 | 120 | end_addr = range_get_last(start_addr, int128_get64(section->size)); |
6b37a23d MT |
121 | start_addr = MAX(first, start_addr); |
122 | end_addr = MIN(last, end_addr); | |
123 | ||
d5970055 MT |
124 | for (i = 0; i < dev->mem->nregions; ++i) { |
125 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
2817b260 | 126 | vhost_dev_sync_region(dev, section, start_addr, end_addr, |
d5970055 MT |
127 | reg->guest_phys_addr, |
128 | range_get_last(reg->guest_phys_addr, | |
129 | reg->memory_size)); | |
130 | } | |
131 | for (i = 0; i < dev->nvqs; ++i) { | |
132 | struct vhost_virtqueue *vq = dev->vqs + i; | |
2817b260 | 133 | vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
d5970055 MT |
134 | range_get_last(vq->used_phys, vq->used_size)); |
135 | } | |
136 | return 0; | |
137 | } | |
138 | ||
04097f7c AK |
139 | static void vhost_log_sync(MemoryListener *listener, |
140 | MemoryRegionSection *section) | |
141 | { | |
142 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
143 | memory_listener); | |
6b37a23d MT |
144 | vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
145 | } | |
04097f7c | 146 | |
6b37a23d MT |
147 | static void vhost_log_sync_range(struct vhost_dev *dev, |
148 | hwaddr first, hwaddr last) | |
149 | { | |
150 | int i; | |
151 | /* FIXME: this is N^2 in number of sections */ | |
152 | for (i = 0; i < dev->n_mem_sections; ++i) { | |
153 | MemoryRegionSection *section = &dev->mem_sections[i]; | |
154 | vhost_sync_dirty_bitmap(dev, section, first, last); | |
155 | } | |
04097f7c AK |
156 | } |
157 | ||
d5970055 MT |
158 | /* Assign/unassign. Keep an unsorted array of non-overlapping |
159 | * memory regions in dev->mem. */ | |
160 | static void vhost_dev_unassign_memory(struct vhost_dev *dev, | |
161 | uint64_t start_addr, | |
162 | uint64_t size) | |
163 | { | |
164 | int from, to, n = dev->mem->nregions; | |
165 | /* Track overlapping/split regions for sanity checking. */ | |
166 | int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0; | |
167 | ||
168 | for (from = 0, to = 0; from < n; ++from, ++to) { | |
169 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
170 | uint64_t reglast; | |
171 | uint64_t memlast; | |
172 | uint64_t change; | |
173 | ||
174 | /* clone old region */ | |
175 | if (to != from) { | |
176 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
177 | } | |
178 | ||
179 | /* No overlap is simple */ | |
180 | if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
181 | start_addr, size)) { | |
182 | continue; | |
183 | } | |
184 | ||
185 | /* Split only happens if supplied region | |
186 | * is in the middle of an existing one. Thus it can not | |
187 | * overlap with any other existing region. */ | |
188 | assert(!split); | |
189 | ||
190 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
191 | memlast = range_get_last(start_addr, size); | |
192 | ||
193 | /* Remove whole region */ | |
194 | if (start_addr <= reg->guest_phys_addr && memlast >= reglast) { | |
195 | --dev->mem->nregions; | |
196 | --to; | |
d5970055 MT |
197 | ++overlap_middle; |
198 | continue; | |
199 | } | |
200 | ||
201 | /* Shrink region */ | |
202 | if (memlast >= reglast) { | |
203 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
204 | assert(reg->memory_size); | |
205 | assert(!overlap_end); | |
206 | ++overlap_end; | |
207 | continue; | |
208 | } | |
209 | ||
210 | /* Shift region */ | |
211 | if (start_addr <= reg->guest_phys_addr) { | |
212 | change = memlast + 1 - reg->guest_phys_addr; | |
213 | reg->memory_size -= change; | |
214 | reg->guest_phys_addr += change; | |
215 | reg->userspace_addr += change; | |
216 | assert(reg->memory_size); | |
217 | assert(!overlap_start); | |
218 | ++overlap_start; | |
219 | continue; | |
220 | } | |
221 | ||
222 | /* This only happens if supplied region | |
223 | * is in the middle of an existing one. Thus it can not | |
224 | * overlap with any other existing region. */ | |
225 | assert(!overlap_start); | |
226 | assert(!overlap_end); | |
227 | assert(!overlap_middle); | |
228 | /* Split region: shrink first part, shift second part. */ | |
229 | memcpy(dev->mem->regions + n, reg, sizeof *reg); | |
230 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
231 | assert(reg->memory_size); | |
232 | change = memlast + 1 - reg->guest_phys_addr; | |
233 | reg = dev->mem->regions + n; | |
234 | reg->memory_size -= change; | |
235 | assert(reg->memory_size); | |
236 | reg->guest_phys_addr += change; | |
237 | reg->userspace_addr += change; | |
238 | /* Never add more than 1 region */ | |
239 | assert(dev->mem->nregions == n); | |
240 | ++dev->mem->nregions; | |
241 | ++split; | |
242 | } | |
243 | } | |
244 | ||
245 | /* Called after unassign, so no regions overlap the given range. */ | |
246 | static void vhost_dev_assign_memory(struct vhost_dev *dev, | |
247 | uint64_t start_addr, | |
248 | uint64_t size, | |
249 | uint64_t uaddr) | |
250 | { | |
251 | int from, to; | |
252 | struct vhost_memory_region *merged = NULL; | |
253 | for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) { | |
254 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
255 | uint64_t prlast, urlast; | |
256 | uint64_t pmlast, umlast; | |
257 | uint64_t s, e, u; | |
258 | ||
259 | /* clone old region */ | |
260 | if (to != from) { | |
261 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
262 | } | |
263 | prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
264 | pmlast = range_get_last(start_addr, size); | |
265 | urlast = range_get_last(reg->userspace_addr, reg->memory_size); | |
266 | umlast = range_get_last(uaddr, size); | |
267 | ||
268 | /* check for overlapping regions: should never happen. */ | |
269 | assert(prlast < start_addr || pmlast < reg->guest_phys_addr); | |
270 | /* Not an adjacent or overlapping region - do not merge. */ | |
271 | if ((prlast + 1 != start_addr || urlast + 1 != uaddr) && | |
272 | (pmlast + 1 != reg->guest_phys_addr || | |
273 | umlast + 1 != reg->userspace_addr)) { | |
274 | continue; | |
275 | } | |
276 | ||
ffe42cc1 MT |
277 | if (dev->vhost_ops->vhost_backend_can_merge && |
278 | !dev->vhost_ops->vhost_backend_can_merge(dev, uaddr, size, | |
279 | reg->userspace_addr, | |
280 | reg->memory_size)) { | |
281 | continue; | |
282 | } | |
283 | ||
d5970055 MT |
284 | if (merged) { |
285 | --to; | |
286 | assert(to >= 0); | |
287 | } else { | |
288 | merged = reg; | |
289 | } | |
290 | u = MIN(uaddr, reg->userspace_addr); | |
291 | s = MIN(start_addr, reg->guest_phys_addr); | |
292 | e = MAX(pmlast, prlast); | |
293 | uaddr = merged->userspace_addr = u; | |
294 | start_addr = merged->guest_phys_addr = s; | |
295 | size = merged->memory_size = e - s + 1; | |
296 | assert(merged->memory_size); | |
297 | } | |
298 | ||
299 | if (!merged) { | |
300 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
301 | memset(reg, 0, sizeof *reg); | |
302 | reg->memory_size = size; | |
303 | assert(reg->memory_size); | |
304 | reg->guest_phys_addr = start_addr; | |
305 | reg->userspace_addr = uaddr; | |
306 | ++to; | |
307 | } | |
308 | assert(to <= dev->mem->nregions + 1); | |
309 | dev->mem->nregions = to; | |
310 | } | |
311 | ||
312 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) | |
313 | { | |
314 | uint64_t log_size = 0; | |
315 | int i; | |
316 | for (i = 0; i < dev->mem->nregions; ++i) { | |
317 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
318 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
319 | reg->memory_size); | |
320 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
321 | } | |
322 | for (i = 0; i < dev->nvqs; ++i) { | |
323 | struct vhost_virtqueue *vq = dev->vqs + i; | |
324 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
325 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
326 | } | |
327 | return log_size; | |
328 | } | |
15324404 MAL |
329 | |
330 | static struct vhost_log *vhost_log_alloc(uint64_t size, bool share) | |
309750fa | 331 | { |
15324404 MAL |
332 | struct vhost_log *log; |
333 | uint64_t logsize = size * sizeof(*(log->log)); | |
334 | int fd = -1; | |
335 | ||
336 | log = g_new0(struct vhost_log, 1); | |
337 | if (share) { | |
338 | log->log = qemu_memfd_alloc("vhost-log", logsize, | |
339 | F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, | |
340 | &fd); | |
341 | memset(log->log, 0, logsize); | |
342 | } else { | |
343 | log->log = g_malloc0(logsize); | |
344 | } | |
309750fa JW |
345 | |
346 | log->size = size; | |
347 | log->refcnt = 1; | |
15324404 | 348 | log->fd = fd; |
309750fa JW |
349 | |
350 | return log; | |
351 | } | |
352 | ||
15324404 | 353 | static struct vhost_log *vhost_log_get(uint64_t size, bool share) |
309750fa | 354 | { |
15324404 MAL |
355 | struct vhost_log *log = share ? vhost_log_shm : vhost_log; |
356 | ||
357 | if (!log || log->size != size) { | |
358 | log = vhost_log_alloc(size, share); | |
359 | if (share) { | |
360 | vhost_log_shm = log; | |
361 | } else { | |
362 | vhost_log = log; | |
363 | } | |
309750fa | 364 | } else { |
15324404 | 365 | ++log->refcnt; |
309750fa JW |
366 | } |
367 | ||
15324404 | 368 | return log; |
309750fa JW |
369 | } |
370 | ||
371 | static void vhost_log_put(struct vhost_dev *dev, bool sync) | |
372 | { | |
373 | struct vhost_log *log = dev->log; | |
374 | ||
375 | if (!log) { | |
376 | return; | |
377 | } | |
378 | ||
379 | --log->refcnt; | |
380 | if (log->refcnt == 0) { | |
381 | /* Sync only the range covered by the old log */ | |
382 | if (dev->log_size && sync) { | |
383 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
384 | } | |
15324404 | 385 | |
309750fa | 386 | if (vhost_log == log) { |
15324404 | 387 | g_free(log->log); |
309750fa | 388 | vhost_log = NULL; |
15324404 MAL |
389 | } else if (vhost_log_shm == log) { |
390 | qemu_memfd_free(log->log, log->size * sizeof(*(log->log)), | |
391 | log->fd); | |
392 | vhost_log_shm = NULL; | |
309750fa | 393 | } |
15324404 | 394 | |
309750fa JW |
395 | g_free(log); |
396 | } | |
5c0ba1be FF |
397 | |
398 | dev->log = NULL; | |
399 | dev->log_size = 0; | |
309750fa | 400 | } |
d5970055 | 401 | |
15324404 MAL |
402 | static bool vhost_dev_log_is_shared(struct vhost_dev *dev) |
403 | { | |
404 | return dev->vhost_ops->vhost_requires_shm_log && | |
405 | dev->vhost_ops->vhost_requires_shm_log(dev); | |
406 | } | |
407 | ||
408 | static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t size) | |
d5970055 | 409 | { |
15324404 | 410 | struct vhost_log *log = vhost_log_get(size, vhost_dev_log_is_shared(dev)); |
309750fa | 411 | uint64_t log_base = (uintptr_t)log->log; |
6b37a23d | 412 | int r; |
6528499f | 413 | |
636f4ddd MAL |
414 | /* inform backend of log switching, this must be done before |
415 | releasing the current log, to ensure no logging is lost */ | |
9a78a5dd | 416 | r = dev->vhost_ops->vhost_set_log_base(dev, log_base, log); |
162bba7f MAL |
417 | if (r < 0) { |
418 | VHOST_OPS_DEBUG("vhost_set_log_base failed"); | |
419 | } | |
420 | ||
309750fa | 421 | vhost_log_put(dev, true); |
d5970055 MT |
422 | dev->log = log; |
423 | dev->log_size = size; | |
424 | } | |
425 | ||
c471ad0e JW |
426 | static int vhost_dev_has_iommu(struct vhost_dev *dev) |
427 | { | |
428 | VirtIODevice *vdev = dev->vdev; | |
c471ad0e | 429 | |
375f74f4 | 430 | return virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); |
c471ad0e JW |
431 | } |
432 | ||
433 | static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr, | |
434 | hwaddr *plen, int is_write) | |
435 | { | |
436 | if (!vhost_dev_has_iommu(dev)) { | |
437 | return cpu_physical_memory_map(addr, plen, is_write); | |
438 | } else { | |
439 | return (void *)(uintptr_t)addr; | |
440 | } | |
441 | } | |
442 | ||
443 | static void vhost_memory_unmap(struct vhost_dev *dev, void *buffer, | |
444 | hwaddr len, int is_write, | |
445 | hwaddr access_len) | |
446 | { | |
447 | if (!vhost_dev_has_iommu(dev)) { | |
448 | cpu_physical_memory_unmap(buffer, len, is_write, access_len); | |
449 | } | |
450 | } | |
f1f9e6c5 | 451 | |
c471ad0e JW |
452 | static int vhost_verify_ring_part_mapping(struct vhost_dev *dev, |
453 | void *part, | |
f1f9e6c5 GK |
454 | uint64_t part_addr, |
455 | uint64_t part_size, | |
456 | uint64_t start_addr, | |
457 | uint64_t size) | |
458 | { | |
459 | hwaddr l; | |
460 | void *p; | |
461 | int r = 0; | |
462 | ||
463 | if (!ranges_overlap(start_addr, size, part_addr, part_size)) { | |
464 | return 0; | |
465 | } | |
466 | l = part_size; | |
c471ad0e | 467 | p = vhost_memory_map(dev, part_addr, &l, 1); |
f1f9e6c5 GK |
468 | if (!p || l != part_size) { |
469 | r = -ENOMEM; | |
470 | } | |
471 | if (p != part) { | |
472 | r = -EBUSY; | |
473 | } | |
c471ad0e | 474 | vhost_memory_unmap(dev, p, l, 0, 0); |
f1f9e6c5 GK |
475 | return r; |
476 | } | |
477 | ||
d5970055 MT |
478 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, |
479 | uint64_t start_addr, | |
480 | uint64_t size) | |
481 | { | |
f1f9e6c5 | 482 | int i, j; |
8617343f | 483 | int r = 0; |
f1f9e6c5 GK |
484 | const char *part_name[] = { |
485 | "descriptor table", | |
486 | "available ring", | |
487 | "used ring" | |
488 | }; | |
8617343f | 489 | |
f1f9e6c5 | 490 | for (i = 0; i < dev->nvqs; ++i) { |
d5970055 | 491 | struct vhost_virtqueue *vq = dev->vqs + i; |
d5970055 | 492 | |
f1f9e6c5 | 493 | j = 0; |
c471ad0e | 494 | r = vhost_verify_ring_part_mapping(dev, vq->desc, vq->desc_phys, |
f1f9e6c5 | 495 | vq->desc_size, start_addr, size); |
2fe45ec3 | 496 | if (r) { |
f1f9e6c5 | 497 | break; |
d5970055 | 498 | } |
f1f9e6c5 GK |
499 | |
500 | j++; | |
c471ad0e | 501 | r = vhost_verify_ring_part_mapping(dev, vq->avail, vq->avail_phys, |
f1f9e6c5 | 502 | vq->avail_size, start_addr, size); |
2fe45ec3 | 503 | if (r) { |
f1f9e6c5 | 504 | break; |
d5970055 | 505 | } |
f1f9e6c5 GK |
506 | |
507 | j++; | |
c471ad0e | 508 | r = vhost_verify_ring_part_mapping(dev, vq->used, vq->used_phys, |
f1f9e6c5 | 509 | vq->used_size, start_addr, size); |
2fe45ec3 | 510 | if (r) { |
f1f9e6c5 | 511 | break; |
d5970055 | 512 | } |
f1f9e6c5 GK |
513 | } |
514 | ||
515 | if (r == -ENOMEM) { | |
516 | error_report("Unable to map %s for ring %d", part_name[j], i); | |
517 | } else if (r == -EBUSY) { | |
518 | error_report("%s relocated for ring %d", part_name[j], i); | |
d5970055 | 519 | } |
8617343f | 520 | return r; |
d5970055 MT |
521 | } |
522 | ||
4e789564 MT |
523 | static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
524 | uint64_t start_addr, | |
525 | uint64_t size) | |
526 | { | |
527 | int i, n = dev->mem->nregions; | |
528 | for (i = 0; i < n; ++i) { | |
529 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
530 | if (ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
531 | start_addr, size)) { | |
532 | return reg; | |
533 | } | |
534 | } | |
535 | return NULL; | |
536 | } | |
537 | ||
538 | static bool vhost_dev_cmp_memory(struct vhost_dev *dev, | |
539 | uint64_t start_addr, | |
540 | uint64_t size, | |
541 | uint64_t uaddr) | |
542 | { | |
543 | struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size); | |
544 | uint64_t reglast; | |
545 | uint64_t memlast; | |
546 | ||
547 | if (!reg) { | |
548 | return true; | |
549 | } | |
550 | ||
551 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
552 | memlast = range_get_last(start_addr, size); | |
553 | ||
554 | /* Need to extend region? */ | |
555 | if (start_addr < reg->guest_phys_addr || memlast > reglast) { | |
556 | return true; | |
557 | } | |
558 | /* userspace_addr changed? */ | |
559 | return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr; | |
560 | } | |
561 | ||
04097f7c AK |
562 | static void vhost_set_memory(MemoryListener *listener, |
563 | MemoryRegionSection *section, | |
564 | bool add) | |
d5970055 | 565 | { |
04097f7c AK |
566 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
567 | memory_listener); | |
a8170e5e | 568 | hwaddr start_addr = section->offset_within_address_space; |
052e87b0 | 569 | ram_addr_t size = int128_get64(section->size); |
2d1a35be PB |
570 | bool log_dirty = |
571 | memory_region_get_dirty_log_mask(section->mr) & ~(1 << DIRTY_MEMORY_MIGRATION); | |
d5970055 MT |
572 | int s = offsetof(struct vhost_memory, regions) + |
573 | (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; | |
04097f7c AK |
574 | void *ram; |
575 | ||
7267c094 | 576 | dev->mem = g_realloc(dev->mem, s); |
d5970055 | 577 | |
f5a4e64f | 578 | if (log_dirty) { |
04097f7c | 579 | add = false; |
f5a4e64f MT |
580 | } |
581 | ||
d5970055 MT |
582 | assert(size); |
583 | ||
4e789564 | 584 | /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */ |
d743c382 | 585 | ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
04097f7c AK |
586 | if (add) { |
587 | if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) { | |
4e789564 MT |
588 | /* Region exists with same address. Nothing to do. */ |
589 | return; | |
590 | } | |
591 | } else { | |
592 | if (!vhost_dev_find_reg(dev, start_addr, size)) { | |
593 | /* Removing region that we don't access. Nothing to do. */ | |
594 | return; | |
595 | } | |
596 | } | |
597 | ||
d5970055 | 598 | vhost_dev_unassign_memory(dev, start_addr, size); |
04097f7c | 599 | if (add) { |
d5970055 | 600 | /* Add given mapping, merging adjacent regions if any */ |
04097f7c | 601 | vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
d5970055 MT |
602 | } else { |
603 | /* Remove old mapping for this memory, if any. */ | |
604 | vhost_dev_unassign_memory(dev, start_addr, size); | |
605 | } | |
af603142 NB |
606 | dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); |
607 | dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); | |
608 | dev->memory_changed = true; | |
2ce68e4c | 609 | used_memslots = dev->mem->nregions; |
af603142 NB |
610 | } |
611 | ||
612 | static bool vhost_section(MemoryRegionSection *section) | |
613 | { | |
d56ec1e9 MT |
614 | return memory_region_is_ram(section->mr) && |
615 | !memory_region_is_rom(section->mr); | |
af603142 NB |
616 | } |
617 | ||
618 | static void vhost_begin(MemoryListener *listener) | |
619 | { | |
620 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
621 | memory_listener); | |
622 | dev->mem_changed_end_addr = 0; | |
623 | dev->mem_changed_start_addr = -1; | |
624 | } | |
d5970055 | 625 | |
af603142 NB |
626 | static void vhost_commit(MemoryListener *listener) |
627 | { | |
628 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
629 | memory_listener); | |
630 | hwaddr start_addr = 0; | |
631 | ram_addr_t size = 0; | |
632 | uint64_t log_size; | |
633 | int r; | |
634 | ||
635 | if (!dev->memory_changed) { | |
636 | return; | |
637 | } | |
d5970055 MT |
638 | if (!dev->started) { |
639 | return; | |
640 | } | |
af603142 NB |
641 | if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { |
642 | return; | |
643 | } | |
d5970055 MT |
644 | |
645 | if (dev->started) { | |
af603142 NB |
646 | start_addr = dev->mem_changed_start_addr; |
647 | size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; | |
648 | ||
d5970055 MT |
649 | r = vhost_verify_ring_mappings(dev, start_addr, size); |
650 | assert(r >= 0); | |
651 | } | |
652 | ||
653 | if (!dev->log_enabled) { | |
21e70425 | 654 | r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
162bba7f MAL |
655 | if (r < 0) { |
656 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); | |
657 | } | |
af603142 | 658 | dev->memory_changed = false; |
d5970055 MT |
659 | return; |
660 | } | |
661 | log_size = vhost_get_log_size(dev); | |
662 | /* We allocate an extra 4K bytes to log, | |
663 | * to reduce the * number of reallocations. */ | |
664 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
665 | /* To log more, must increase log size before table update. */ | |
666 | if (dev->log_size < log_size) { | |
667 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
668 | } | |
21e70425 | 669 | r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
162bba7f MAL |
670 | if (r < 0) { |
671 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); | |
672 | } | |
d5970055 MT |
673 | /* To log less, can only decrease log size after table update. */ |
674 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
675 | vhost_dev_log_resize(dev, log_size); | |
676 | } | |
af603142 | 677 | dev->memory_changed = false; |
50c1e149 AK |
678 | } |
679 | ||
04097f7c AK |
680 | static void vhost_region_add(MemoryListener *listener, |
681 | MemoryRegionSection *section) | |
682 | { | |
2817b260 AK |
683 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
684 | memory_listener); | |
685 | ||
c49450b9 AK |
686 | if (!vhost_section(section)) { |
687 | return; | |
688 | } | |
689 | ||
2817b260 AK |
690 | ++dev->n_mem_sections; |
691 | dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, | |
692 | dev->n_mem_sections); | |
693 | dev->mem_sections[dev->n_mem_sections - 1] = *section; | |
dfde4e6e | 694 | memory_region_ref(section->mr); |
04097f7c AK |
695 | vhost_set_memory(listener, section, true); |
696 | } | |
697 | ||
698 | static void vhost_region_del(MemoryListener *listener, | |
699 | MemoryRegionSection *section) | |
700 | { | |
2817b260 AK |
701 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
702 | memory_listener); | |
703 | int i; | |
704 | ||
c49450b9 AK |
705 | if (!vhost_section(section)) { |
706 | return; | |
707 | } | |
708 | ||
04097f7c | 709 | vhost_set_memory(listener, section, false); |
dfde4e6e | 710 | memory_region_unref(section->mr); |
2817b260 AK |
711 | for (i = 0; i < dev->n_mem_sections; ++i) { |
712 | if (dev->mem_sections[i].offset_within_address_space | |
713 | == section->offset_within_address_space) { | |
714 | --dev->n_mem_sections; | |
715 | memmove(&dev->mem_sections[i], &dev->mem_sections[i+1], | |
637f7a6a | 716 | (dev->n_mem_sections - i) * sizeof(*dev->mem_sections)); |
2817b260 AK |
717 | break; |
718 | } | |
719 | } | |
04097f7c AK |
720 | } |
721 | ||
375f74f4 JW |
722 | static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) |
723 | { | |
724 | struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n); | |
725 | struct vhost_dev *hdev = iommu->hdev; | |
726 | hwaddr iova = iotlb->iova + iommu->iommu_offset; | |
727 | ||
020e571b MC |
728 | if (vhost_backend_invalidate_device_iotlb(hdev, iova, |
729 | iotlb->addr_mask + 1)) { | |
375f74f4 JW |
730 | error_report("Fail to invalidate device iotlb"); |
731 | } | |
732 | } | |
733 | ||
734 | static void vhost_iommu_region_add(MemoryListener *listener, | |
735 | MemoryRegionSection *section) | |
736 | { | |
737 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
738 | iommu_listener); | |
739 | struct vhost_iommu *iommu; | |
698feb5e | 740 | Int128 end; |
375f74f4 JW |
741 | |
742 | if (!memory_region_is_iommu(section->mr)) { | |
743 | return; | |
744 | } | |
745 | ||
746 | iommu = g_malloc0(sizeof(*iommu)); | |
698feb5e PX |
747 | end = int128_add(int128_make64(section->offset_within_region), |
748 | section->size); | |
749 | end = int128_sub(end, int128_one()); | |
750 | iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify, | |
751 | IOMMU_NOTIFIER_UNMAP, | |
752 | section->offset_within_region, | |
753 | int128_get64(end)); | |
375f74f4 JW |
754 | iommu->mr = section->mr; |
755 | iommu->iommu_offset = section->offset_within_address_space - | |
756 | section->offset_within_region; | |
757 | iommu->hdev = dev; | |
758 | memory_region_register_iommu_notifier(section->mr, &iommu->n); | |
759 | QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next); | |
760 | /* TODO: can replay help performance here? */ | |
761 | } | |
762 | ||
763 | static void vhost_iommu_region_del(MemoryListener *listener, | |
764 | MemoryRegionSection *section) | |
765 | { | |
766 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
767 | iommu_listener); | |
768 | struct vhost_iommu *iommu; | |
769 | ||
770 | if (!memory_region_is_iommu(section->mr)) { | |
771 | return; | |
772 | } | |
773 | ||
774 | QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) { | |
698feb5e PX |
775 | if (iommu->mr == section->mr && |
776 | iommu->n.start == section->offset_within_region) { | |
375f74f4 JW |
777 | memory_region_unregister_iommu_notifier(iommu->mr, |
778 | &iommu->n); | |
779 | QLIST_REMOVE(iommu, iommu_next); | |
780 | g_free(iommu); | |
781 | break; | |
782 | } | |
783 | } | |
784 | } | |
785 | ||
50c1e149 AK |
786 | static void vhost_region_nop(MemoryListener *listener, |
787 | MemoryRegionSection *section) | |
788 | { | |
789 | } | |
790 | ||
d5970055 MT |
791 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
792 | struct vhost_virtqueue *vq, | |
793 | unsigned idx, bool enable_log) | |
794 | { | |
795 | struct vhost_vring_addr addr = { | |
796 | .index = idx, | |
2b3af999 SW |
797 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
798 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
799 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
800 | .log_guest_addr = vq->used_phys, |
801 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
802 | }; | |
21e70425 | 803 | int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr); |
d5970055 | 804 | if (r < 0) { |
c6409692 | 805 | VHOST_OPS_DEBUG("vhost_set_vring_addr failed"); |
d5970055 MT |
806 | return -errno; |
807 | } | |
808 | return 0; | |
809 | } | |
810 | ||
c471ad0e JW |
811 | static int vhost_dev_set_features(struct vhost_dev *dev, |
812 | bool enable_log) | |
d5970055 MT |
813 | { |
814 | uint64_t features = dev->acked_features; | |
815 | int r; | |
816 | if (enable_log) { | |
9a2ba823 | 817 | features |= 0x1ULL << VHOST_F_LOG_ALL; |
d5970055 | 818 | } |
21e70425 | 819 | r = dev->vhost_ops->vhost_set_features(dev, features); |
c6409692 MAL |
820 | if (r < 0) { |
821 | VHOST_OPS_DEBUG("vhost_set_features failed"); | |
822 | } | |
d5970055 MT |
823 | return r < 0 ? -errno : 0; |
824 | } | |
825 | ||
826 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
827 | { | |
162bba7f | 828 | int r, i, idx; |
d5970055 MT |
829 | r = vhost_dev_set_features(dev, enable_log); |
830 | if (r < 0) { | |
831 | goto err_features; | |
832 | } | |
833 | for (i = 0; i < dev->nvqs; ++i) { | |
25a2a920 TC |
834 | idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
835 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, | |
d5970055 MT |
836 | enable_log); |
837 | if (r < 0) { | |
838 | goto err_vq; | |
839 | } | |
840 | } | |
841 | return 0; | |
842 | err_vq: | |
843 | for (; i >= 0; --i) { | |
25a2a920 | 844 | idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
162bba7f MAL |
845 | vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, |
846 | dev->log_enabled); | |
d5970055 | 847 | } |
162bba7f | 848 | vhost_dev_set_features(dev, dev->log_enabled); |
d5970055 MT |
849 | err_features: |
850 | return r; | |
851 | } | |
852 | ||
04097f7c | 853 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 854 | { |
04097f7c AK |
855 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
856 | memory_listener); | |
d5970055 MT |
857 | int r; |
858 | if (!!enable == dev->log_enabled) { | |
859 | return 0; | |
860 | } | |
861 | if (!dev->started) { | |
862 | dev->log_enabled = enable; | |
863 | return 0; | |
864 | } | |
865 | if (!enable) { | |
866 | r = vhost_dev_set_log(dev, false); | |
867 | if (r < 0) { | |
868 | return r; | |
869 | } | |
309750fa | 870 | vhost_log_put(dev, false); |
d5970055 MT |
871 | } else { |
872 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
873 | r = vhost_dev_set_log(dev, true); | |
874 | if (r < 0) { | |
875 | return r; | |
876 | } | |
877 | } | |
878 | dev->log_enabled = enable; | |
879 | return 0; | |
880 | } | |
881 | ||
04097f7c AK |
882 | static void vhost_log_global_start(MemoryListener *listener) |
883 | { | |
884 | int r; | |
885 | ||
886 | r = vhost_migration_log(listener, true); | |
887 | if (r < 0) { | |
888 | abort(); | |
889 | } | |
890 | } | |
891 | ||
892 | static void vhost_log_global_stop(MemoryListener *listener) | |
893 | { | |
894 | int r; | |
895 | ||
896 | r = vhost_migration_log(listener, false); | |
897 | if (r < 0) { | |
898 | abort(); | |
899 | } | |
900 | } | |
901 | ||
902 | static void vhost_log_start(MemoryListener *listener, | |
b2dfd71c PB |
903 | MemoryRegionSection *section, |
904 | int old, int new) | |
04097f7c AK |
905 | { |
906 | /* FIXME: implement */ | |
907 | } | |
908 | ||
909 | static void vhost_log_stop(MemoryListener *listener, | |
b2dfd71c PB |
910 | MemoryRegionSection *section, |
911 | int old, int new) | |
04097f7c AK |
912 | { |
913 | /* FIXME: implement */ | |
914 | } | |
915 | ||
46f70ff1 GK |
916 | /* The vhost driver natively knows how to handle the vrings of non |
917 | * cross-endian legacy devices and modern devices. Only legacy devices | |
918 | * exposed to a bi-endian guest may require the vhost driver to use a | |
919 | * specific endianness. | |
920 | */ | |
a122ab24 GK |
921 | static inline bool vhost_needs_vring_endian(VirtIODevice *vdev) |
922 | { | |
e5848123 GK |
923 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
924 | return false; | |
925 | } | |
a122ab24 | 926 | #ifdef HOST_WORDS_BIGENDIAN |
46f70ff1 | 927 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE; |
a122ab24 | 928 | #else |
46f70ff1 | 929 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; |
a122ab24 | 930 | #endif |
a122ab24 GK |
931 | } |
932 | ||
04b7a152 GK |
933 | static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, |
934 | bool is_big_endian, | |
935 | int vhost_vq_index) | |
936 | { | |
937 | struct vhost_vring_state s = { | |
938 | .index = vhost_vq_index, | |
939 | .num = is_big_endian | |
940 | }; | |
941 | ||
21e70425 | 942 | if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) { |
04b7a152 GK |
943 | return 0; |
944 | } | |
945 | ||
c6409692 | 946 | VHOST_OPS_DEBUG("vhost_set_vring_endian failed"); |
04b7a152 GK |
947 | if (errno == ENOTTY) { |
948 | error_report("vhost does not support cross-endian"); | |
949 | return -ENOSYS; | |
950 | } | |
951 | ||
952 | return -errno; | |
953 | } | |
954 | ||
c471ad0e JW |
955 | static int vhost_memory_region_lookup(struct vhost_dev *hdev, |
956 | uint64_t gpa, uint64_t *uaddr, | |
957 | uint64_t *len) | |
958 | { | |
959 | int i; | |
960 | ||
961 | for (i = 0; i < hdev->mem->nregions; i++) { | |
962 | struct vhost_memory_region *reg = hdev->mem->regions + i; | |
963 | ||
964 | if (gpa >= reg->guest_phys_addr && | |
965 | reg->guest_phys_addr + reg->memory_size > gpa) { | |
966 | *uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr; | |
967 | *len = reg->guest_phys_addr + reg->memory_size - gpa; | |
968 | return 0; | |
969 | } | |
970 | } | |
971 | ||
972 | return -EFAULT; | |
973 | } | |
974 | ||
fc58bd0d | 975 | int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write) |
c471ad0e JW |
976 | { |
977 | IOMMUTLBEntry iotlb; | |
978 | uint64_t uaddr, len; | |
fc58bd0d | 979 | int ret = -EFAULT; |
c471ad0e JW |
980 | |
981 | rcu_read_lock(); | |
982 | ||
983 | iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as, | |
984 | iova, write); | |
985 | if (iotlb.target_as != NULL) { | |
fc58bd0d MC |
986 | ret = vhost_memory_region_lookup(dev, iotlb.translated_addr, |
987 | &uaddr, &len); | |
988 | if (ret) { | |
c471ad0e JW |
989 | error_report("Fail to lookup the translated address " |
990 | "%"PRIx64, iotlb.translated_addr); | |
991 | goto out; | |
992 | } | |
993 | ||
994 | len = MIN(iotlb.addr_mask + 1, len); | |
995 | iova = iova & ~iotlb.addr_mask; | |
996 | ||
020e571b MC |
997 | ret = vhost_backend_update_device_iotlb(dev, iova, uaddr, |
998 | len, iotlb.perm); | |
fc58bd0d | 999 | if (ret) { |
c471ad0e JW |
1000 | error_report("Fail to update device iotlb"); |
1001 | goto out; | |
1002 | } | |
1003 | } | |
1004 | out: | |
1005 | rcu_read_unlock(); | |
fc58bd0d MC |
1006 | |
1007 | return ret; | |
c471ad0e JW |
1008 | } |
1009 | ||
f56a1247 | 1010 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
1011 | struct VirtIODevice *vdev, |
1012 | struct vhost_virtqueue *vq, | |
1013 | unsigned idx) | |
1014 | { | |
96a3d98d JW |
1015 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
1016 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
1017 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
a8170e5e | 1018 | hwaddr s, l, a; |
d5970055 | 1019 | int r; |
21e70425 | 1020 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
d5970055 | 1021 | struct vhost_vring_file file = { |
a9f98bb5 | 1022 | .index = vhost_vq_index |
d5970055 MT |
1023 | }; |
1024 | struct vhost_vring_state state = { | |
a9f98bb5 | 1025 | .index = vhost_vq_index |
d5970055 MT |
1026 | }; |
1027 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
1028 | ||
a9f98bb5 | 1029 | |
d5970055 | 1030 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
21e70425 | 1031 | r = dev->vhost_ops->vhost_set_vring_num(dev, &state); |
d5970055 | 1032 | if (r) { |
c6409692 | 1033 | VHOST_OPS_DEBUG("vhost_set_vring_num failed"); |
d5970055 MT |
1034 | return -errno; |
1035 | } | |
1036 | ||
1037 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
21e70425 | 1038 | r = dev->vhost_ops->vhost_set_vring_base(dev, &state); |
d5970055 | 1039 | if (r) { |
c6409692 | 1040 | VHOST_OPS_DEBUG("vhost_set_vring_base failed"); |
d5970055 MT |
1041 | return -errno; |
1042 | } | |
1043 | ||
e5848123 | 1044 | if (vhost_needs_vring_endian(vdev)) { |
04b7a152 GK |
1045 | r = vhost_virtqueue_set_vring_endian_legacy(dev, |
1046 | virtio_is_big_endian(vdev), | |
1047 | vhost_vq_index); | |
1048 | if (r) { | |
1049 | return -errno; | |
1050 | } | |
1051 | } | |
1052 | ||
f1f9e6c5 GK |
1053 | vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx); |
1054 | vq->desc_phys = a = virtio_queue_get_desc_addr(vdev, idx); | |
c471ad0e | 1055 | vq->desc = vhost_memory_map(dev, a, &l, 0); |
d5970055 MT |
1056 | if (!vq->desc || l != s) { |
1057 | r = -ENOMEM; | |
1058 | goto fail_alloc_desc; | |
1059 | } | |
f1f9e6c5 GK |
1060 | vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx); |
1061 | vq->avail_phys = a = virtio_queue_get_avail_addr(vdev, idx); | |
c471ad0e | 1062 | vq->avail = vhost_memory_map(dev, a, &l, 0); |
d5970055 MT |
1063 | if (!vq->avail || l != s) { |
1064 | r = -ENOMEM; | |
1065 | goto fail_alloc_avail; | |
1066 | } | |
1067 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
1068 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
c471ad0e | 1069 | vq->used = vhost_memory_map(dev, a, &l, 1); |
d5970055 MT |
1070 | if (!vq->used || l != s) { |
1071 | r = -ENOMEM; | |
1072 | goto fail_alloc_used; | |
1073 | } | |
1074 | ||
a9f98bb5 | 1075 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
1076 | if (r < 0) { |
1077 | r = -errno; | |
1078 | goto fail_alloc; | |
1079 | } | |
a9f98bb5 | 1080 | |
d5970055 | 1081 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
21e70425 | 1082 | r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); |
d5970055 | 1083 | if (r) { |
c6409692 | 1084 | VHOST_OPS_DEBUG("vhost_set_vring_kick failed"); |
c8852121 | 1085 | r = -errno; |
d5970055 MT |
1086 | goto fail_kick; |
1087 | } | |
1088 | ||
f56a1247 MT |
1089 | /* Clear and discard previous events if any. */ |
1090 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 | 1091 | |
5669655a VK |
1092 | /* Init vring in unmasked state, unless guest_notifier_mask |
1093 | * will do it later. | |
1094 | */ | |
1095 | if (!vdev->use_guest_notifier_mask) { | |
1096 | /* TODO: check and handle errors. */ | |
1097 | vhost_virtqueue_mask(dev, vdev, idx, false); | |
1098 | } | |
1099 | ||
96a3d98d JW |
1100 | if (k->query_guest_notifiers && |
1101 | k->query_guest_notifiers(qbus->parent) && | |
1102 | virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) { | |
1103 | file.fd = -1; | |
1104 | r = dev->vhost_ops->vhost_set_vring_call(dev, &file); | |
1105 | if (r) { | |
1106 | goto fail_vector; | |
1107 | } | |
1108 | } | |
1109 | ||
d5970055 MT |
1110 | return 0; |
1111 | ||
96a3d98d | 1112 | fail_vector: |
d5970055 | 1113 | fail_kick: |
d5970055 | 1114 | fail_alloc: |
c471ad0e JW |
1115 | vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
1116 | 0, 0); | |
d5970055 | 1117 | fail_alloc_used: |
c471ad0e JW |
1118 | vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), |
1119 | 0, 0); | |
d5970055 | 1120 | fail_alloc_avail: |
c471ad0e JW |
1121 | vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), |
1122 | 0, 0); | |
d5970055 MT |
1123 | fail_alloc_desc: |
1124 | return r; | |
1125 | } | |
1126 | ||
f56a1247 | 1127 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
1128 | struct VirtIODevice *vdev, |
1129 | struct vhost_virtqueue *vq, | |
1130 | unsigned idx) | |
1131 | { | |
21e70425 | 1132 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
d5970055 | 1133 | struct vhost_vring_state state = { |
04b7a152 | 1134 | .index = vhost_vq_index, |
d5970055 MT |
1135 | }; |
1136 | int r; | |
fc57fd99 | 1137 | |
21e70425 | 1138 | r = dev->vhost_ops->vhost_get_vring_base(dev, &state); |
d5970055 | 1139 | if (r < 0) { |
c6409692 | 1140 | VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r); |
2ae39a11 MC |
1141 | /* Connection to the backend is broken, so let's sync internal |
1142 | * last avail idx to the device used idx. | |
1143 | */ | |
1144 | virtio_queue_restore_last_avail_idx(vdev, idx); | |
499c5579 MAL |
1145 | } else { |
1146 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
d5970055 | 1147 | } |
3561ba14 | 1148 | virtio_queue_invalidate_signalled_used(vdev, idx); |
aa94d521 | 1149 | virtio_queue_update_used_idx(vdev, idx); |
04b7a152 GK |
1150 | |
1151 | /* In the cross-endian case, we need to reset the vring endianness to | |
1152 | * native as legacy devices expect so by default. | |
1153 | */ | |
e5848123 | 1154 | if (vhost_needs_vring_endian(vdev)) { |
162bba7f MAL |
1155 | vhost_virtqueue_set_vring_endian_legacy(dev, |
1156 | !virtio_is_big_endian(vdev), | |
1157 | vhost_vq_index); | |
04b7a152 GK |
1158 | } |
1159 | ||
c471ad0e JW |
1160 | vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
1161 | 1, virtio_queue_get_used_size(vdev, idx)); | |
1162 | vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
1163 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
1164 | vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
1165 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
d5970055 MT |
1166 | } |
1167 | ||
80a1ea37 AK |
1168 | static void vhost_eventfd_add(MemoryListener *listener, |
1169 | MemoryRegionSection *section, | |
753d5e14 | 1170 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
1171 | { |
1172 | } | |
1173 | ||
1174 | static void vhost_eventfd_del(MemoryListener *listener, | |
1175 | MemoryRegionSection *section, | |
753d5e14 | 1176 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
1177 | { |
1178 | } | |
1179 | ||
69e87b32 JW |
1180 | static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev, |
1181 | int n, uint32_t timeout) | |
1182 | { | |
1183 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); | |
1184 | struct vhost_vring_state state = { | |
1185 | .index = vhost_vq_index, | |
1186 | .num = timeout, | |
1187 | }; | |
1188 | int r; | |
1189 | ||
1190 | if (!dev->vhost_ops->vhost_set_vring_busyloop_timeout) { | |
1191 | return -EINVAL; | |
1192 | } | |
1193 | ||
1194 | r = dev->vhost_ops->vhost_set_vring_busyloop_timeout(dev, &state); | |
1195 | if (r) { | |
c6409692 | 1196 | VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed"); |
69e87b32 JW |
1197 | return r; |
1198 | } | |
1199 | ||
1200 | return 0; | |
1201 | } | |
1202 | ||
f56a1247 MT |
1203 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
1204 | struct vhost_virtqueue *vq, int n) | |
1205 | { | |
21e70425 | 1206 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); |
f56a1247 | 1207 | struct vhost_vring_file file = { |
b931bfbf | 1208 | .index = vhost_vq_index, |
f56a1247 MT |
1209 | }; |
1210 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
1211 | if (r < 0) { | |
1212 | return r; | |
1213 | } | |
1214 | ||
1215 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
21e70425 | 1216 | r = dev->vhost_ops->vhost_set_vring_call(dev, &file); |
f56a1247 | 1217 | if (r) { |
c6409692 | 1218 | VHOST_OPS_DEBUG("vhost_set_vring_call failed"); |
f56a1247 MT |
1219 | r = -errno; |
1220 | goto fail_call; | |
1221 | } | |
c471ad0e JW |
1222 | |
1223 | vq->dev = dev; | |
1224 | ||
f56a1247 MT |
1225 | return 0; |
1226 | fail_call: | |
1227 | event_notifier_cleanup(&vq->masked_notifier); | |
1228 | return r; | |
1229 | } | |
1230 | ||
1231 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
1232 | { | |
1233 | event_notifier_cleanup(&vq->masked_notifier); | |
1234 | } | |
1235 | ||
81647a65 | 1236 | int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
69e87b32 | 1237 | VhostBackendType backend_type, uint32_t busyloop_timeout) |
d5970055 MT |
1238 | { |
1239 | uint64_t features; | |
a06db3ec | 1240 | int i, r, n_initialized_vqs = 0; |
fe44dc91 | 1241 | Error *local_err = NULL; |
81647a65 | 1242 | |
c471ad0e | 1243 | hdev->vdev = NULL; |
d2fc4402 MAL |
1244 | hdev->migration_blocker = NULL; |
1245 | ||
7cb8a9b9 MAL |
1246 | r = vhost_set_backend_type(hdev, backend_type); |
1247 | assert(r >= 0); | |
1a1bfac9 | 1248 | |
7cb8a9b9 MAL |
1249 | r = hdev->vhost_ops->vhost_backend_init(hdev, opaque); |
1250 | if (r < 0) { | |
1251 | goto fail; | |
24d1eb33 NN |
1252 | } |
1253 | ||
aebf8168 | 1254 | if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { |
4afba631 MAL |
1255 | error_report("vhost backend memory slots limit is less" |
1256 | " than current number of present memory slots"); | |
7cb8a9b9 MAL |
1257 | r = -1; |
1258 | goto fail; | |
aebf8168 | 1259 | } |
2ce68e4c | 1260 | |
21e70425 | 1261 | r = hdev->vhost_ops->vhost_set_owner(hdev); |
d5970055 | 1262 | if (r < 0) { |
c6409692 | 1263 | VHOST_OPS_DEBUG("vhost_set_owner failed"); |
d5970055 MT |
1264 | goto fail; |
1265 | } | |
1266 | ||
21e70425 | 1267 | r = hdev->vhost_ops->vhost_get_features(hdev, &features); |
d5970055 | 1268 | if (r < 0) { |
c6409692 | 1269 | VHOST_OPS_DEBUG("vhost_get_features failed"); |
d5970055 MT |
1270 | goto fail; |
1271 | } | |
f56a1247 | 1272 | |
a06db3ec | 1273 | for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) { |
b931bfbf | 1274 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); |
f56a1247 | 1275 | if (r < 0) { |
a06db3ec | 1276 | goto fail; |
f56a1247 MT |
1277 | } |
1278 | } | |
69e87b32 JW |
1279 | |
1280 | if (busyloop_timeout) { | |
1281 | for (i = 0; i < hdev->nvqs; ++i) { | |
1282 | r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, | |
1283 | busyloop_timeout); | |
1284 | if (r < 0) { | |
1285 | goto fail_busyloop; | |
1286 | } | |
1287 | } | |
1288 | } | |
1289 | ||
d5970055 MT |
1290 | hdev->features = features; |
1291 | ||
04097f7c | 1292 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
1293 | .begin = vhost_begin, |
1294 | .commit = vhost_commit, | |
04097f7c AK |
1295 | .region_add = vhost_region_add, |
1296 | .region_del = vhost_region_del, | |
50c1e149 | 1297 | .region_nop = vhost_region_nop, |
04097f7c AK |
1298 | .log_start = vhost_log_start, |
1299 | .log_stop = vhost_log_stop, | |
1300 | .log_sync = vhost_log_sync, | |
1301 | .log_global_start = vhost_log_global_start, | |
1302 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
1303 | .eventfd_add = vhost_eventfd_add, |
1304 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 1305 | .priority = 10 |
04097f7c | 1306 | }; |
d2fc4402 | 1307 | |
375f74f4 JW |
1308 | hdev->iommu_listener = (MemoryListener) { |
1309 | .region_add = vhost_iommu_region_add, | |
1310 | .region_del = vhost_iommu_region_del, | |
1311 | }; | |
c471ad0e | 1312 | |
d2fc4402 MAL |
1313 | if (hdev->migration_blocker == NULL) { |
1314 | if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { | |
1315 | error_setg(&hdev->migration_blocker, | |
1316 | "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); | |
0d34fbab | 1317 | } else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_check()) { |
31190ed7 MAL |
1318 | error_setg(&hdev->migration_blocker, |
1319 | "Migration disabled: failed to allocate shared memory"); | |
d2fc4402 MAL |
1320 | } |
1321 | } | |
1322 | ||
1323 | if (hdev->migration_blocker != NULL) { | |
fe44dc91 AA |
1324 | r = migrate_add_blocker(hdev->migration_blocker, &local_err); |
1325 | if (local_err) { | |
1326 | error_report_err(local_err); | |
1327 | error_free(hdev->migration_blocker); | |
1328 | goto fail_busyloop; | |
1329 | } | |
7145872e | 1330 | } |
d2fc4402 | 1331 | |
7267c094 | 1332 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
1333 | hdev->n_mem_sections = 0; |
1334 | hdev->mem_sections = NULL; | |
d5970055 MT |
1335 | hdev->log = NULL; |
1336 | hdev->log_size = 0; | |
1337 | hdev->log_enabled = false; | |
1338 | hdev->started = false; | |
af603142 | 1339 | hdev->memory_changed = false; |
f6790af6 | 1340 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
5be5f9be | 1341 | QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); |
d5970055 | 1342 | return 0; |
a06db3ec | 1343 | |
69e87b32 JW |
1344 | fail_busyloop: |
1345 | while (--i >= 0) { | |
1346 | vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0); | |
1347 | } | |
d5970055 | 1348 | fail: |
a06db3ec MAL |
1349 | hdev->nvqs = n_initialized_vqs; |
1350 | vhost_dev_cleanup(hdev); | |
d5970055 MT |
1351 | return r; |
1352 | } | |
1353 | ||
1354 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
1355 | { | |
f56a1247 | 1356 | int i; |
e0547b59 | 1357 | |
f56a1247 MT |
1358 | for (i = 0; i < hdev->nvqs; ++i) { |
1359 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
1360 | } | |
5be5f9be MAL |
1361 | if (hdev->mem) { |
1362 | /* those are only safe after successful init */ | |
1363 | memory_listener_unregister(&hdev->memory_listener); | |
ee4c1128 AW |
1364 | for (i = 0; i < hdev->n_mem_sections; ++i) { |
1365 | MemoryRegionSection *section = &hdev->mem_sections[i]; | |
1366 | memory_region_unref(section->mr); | |
1367 | } | |
5be5f9be MAL |
1368 | QLIST_REMOVE(hdev, entry); |
1369 | } | |
7145872e MT |
1370 | if (hdev->migration_blocker) { |
1371 | migrate_del_blocker(hdev->migration_blocker); | |
1372 | error_free(hdev->migration_blocker); | |
1373 | } | |
7267c094 | 1374 | g_free(hdev->mem); |
2817b260 | 1375 | g_free(hdev->mem_sections); |
e0547b59 MAL |
1376 | if (hdev->vhost_ops) { |
1377 | hdev->vhost_ops->vhost_backend_cleanup(hdev); | |
1378 | } | |
7b527247 | 1379 | assert(!hdev->log); |
e0547b59 MAL |
1380 | |
1381 | memset(hdev, 0, sizeof(struct vhost_dev)); | |
d5970055 MT |
1382 | } |
1383 | ||
b0b3db79 MT |
1384 | /* Stop processing guest IO notifications in qemu. |
1385 | * Start processing them in vhost in kernel. | |
1386 | */ | |
1387 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1388 | { | |
1c819449 | 1389 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
16617e36 | 1390 | int i, r, e; |
4afba631 | 1391 | |
310837de PB |
1392 | /* We will pass the notifiers to the kernel, make sure that QEMU |
1393 | * doesn't interfere. | |
1394 | */ | |
1395 | r = virtio_device_grab_ioeventfd(vdev); | |
1396 | if (r < 0) { | |
4afba631 | 1397 | error_report("binding does not support host notifiers"); |
b0b3db79 MT |
1398 | goto fail; |
1399 | } | |
1400 | ||
1401 | for (i = 0; i < hdev->nvqs; ++i) { | |
b1f0a33d CH |
1402 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1403 | true); | |
b0b3db79 | 1404 | if (r < 0) { |
4afba631 | 1405 | error_report("vhost VQ %d notifier binding failed: %d", i, -r); |
b0b3db79 MT |
1406 | goto fail_vq; |
1407 | } | |
1408 | } | |
1409 | ||
1410 | return 0; | |
1411 | fail_vq: | |
1412 | while (--i >= 0) { | |
b1f0a33d CH |
1413 | e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1414 | false); | |
16617e36 | 1415 | if (e < 0) { |
4afba631 | 1416 | error_report("vhost VQ %d notifier cleanup error: %d", i, -r); |
b0b3db79 | 1417 | } |
16617e36 | 1418 | assert (e >= 0); |
b0b3db79 | 1419 | } |
310837de | 1420 | virtio_device_release_ioeventfd(vdev); |
b0b3db79 MT |
1421 | fail: |
1422 | return r; | |
1423 | } | |
1424 | ||
1425 | /* Stop processing guest IO notifications in vhost. | |
1426 | * Start processing them in qemu. | |
1427 | * This might actually run the qemu handlers right away, | |
1428 | * so virtio in qemu must be completely setup when this is called. | |
1429 | */ | |
1430 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1431 | { | |
1c819449 | 1432 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
b0b3db79 MT |
1433 | int i, r; |
1434 | ||
1435 | for (i = 0; i < hdev->nvqs; ++i) { | |
b1f0a33d CH |
1436 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1437 | false); | |
b0b3db79 | 1438 | if (r < 0) { |
4afba631 | 1439 | error_report("vhost VQ %d notifier cleanup failed: %d", i, -r); |
b0b3db79 MT |
1440 | } |
1441 | assert (r >= 0); | |
1442 | } | |
310837de | 1443 | virtio_device_release_ioeventfd(vdev); |
b0b3db79 MT |
1444 | } |
1445 | ||
f56a1247 MT |
1446 | /* Test and clear event pending status. |
1447 | * Should be called after unmask to avoid losing events. | |
1448 | */ | |
1449 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
1450 | { | |
a9f98bb5 | 1451 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
a9f98bb5 | 1452 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
1453 | return event_notifier_test_and_clear(&vq->masked_notifier); |
1454 | } | |
1455 | ||
1456 | /* Mask/unmask events from this vq. */ | |
1457 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
1458 | bool mask) | |
1459 | { | |
1460 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 1461 | int r, index = n - hdev->vq_index; |
fc57fd99 | 1462 | struct vhost_vring_file file; |
f56a1247 | 1463 | |
8695de0f MAL |
1464 | /* should only be called after backend is connected */ |
1465 | assert(hdev->vhost_ops); | |
1466 | ||
f56a1247 | 1467 | if (mask) { |
5669655a | 1468 | assert(vdev->use_guest_notifier_mask); |
a9f98bb5 | 1469 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
1470 | } else { |
1471 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
1472 | } | |
fc57fd99 | 1473 | |
21e70425 MAL |
1474 | file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n); |
1475 | r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file); | |
162bba7f MAL |
1476 | if (r < 0) { |
1477 | VHOST_OPS_DEBUG("vhost_set_vring_call failed"); | |
1478 | } | |
f56a1247 MT |
1479 | } |
1480 | ||
9a2ba823 CH |
1481 | uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
1482 | uint64_t features) | |
2e6d46d7 NN |
1483 | { |
1484 | const int *bit = feature_bits; | |
1485 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1486 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1487 | if (!(hdev->features & bit_mask)) { |
1488 | features &= ~bit_mask; | |
1489 | } | |
1490 | bit++; | |
1491 | } | |
1492 | return features; | |
1493 | } | |
1494 | ||
1495 | void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, | |
9a2ba823 | 1496 | uint64_t features) |
2e6d46d7 NN |
1497 | { |
1498 | const int *bit = feature_bits; | |
1499 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1500 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1501 | if (features & bit_mask) { |
1502 | hdev->acked_features |= bit_mask; | |
1503 | } | |
1504 | bit++; | |
1505 | } | |
1506 | } | |
1507 | ||
b0b3db79 | 1508 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1509 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1510 | { | |
1511 | int i, r; | |
24f4fe34 | 1512 | |
8695de0f MAL |
1513 | /* should only be called after backend is connected */ |
1514 | assert(hdev->vhost_ops); | |
1515 | ||
24f4fe34 | 1516 | hdev->started = true; |
c471ad0e | 1517 | hdev->vdev = vdev; |
24f4fe34 | 1518 | |
d5970055 MT |
1519 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1520 | if (r < 0) { | |
54dd9321 | 1521 | goto fail_features; |
d5970055 | 1522 | } |
c471ad0e JW |
1523 | |
1524 | if (vhost_dev_has_iommu(hdev)) { | |
375f74f4 | 1525 | memory_listener_register(&hdev->iommu_listener, vdev->dma_as); |
c471ad0e JW |
1526 | } |
1527 | ||
21e70425 | 1528 | r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem); |
d5970055 | 1529 | if (r < 0) { |
c6409692 | 1530 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); |
d5970055 | 1531 | r = -errno; |
54dd9321 | 1532 | goto fail_mem; |
d5970055 | 1533 | } |
d154e0ba | 1534 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1535 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1536 | vdev, |
1537 | hdev->vqs + i, | |
1538 | hdev->vq_index + i); | |
d154e0ba MT |
1539 | if (r < 0) { |
1540 | goto fail_vq; | |
1541 | } | |
1542 | } | |
1543 | ||
d5970055 | 1544 | if (hdev->log_enabled) { |
e05ca820 MT |
1545 | uint64_t log_base; |
1546 | ||
d5970055 | 1547 | hdev->log_size = vhost_get_log_size(hdev); |
15324404 MAL |
1548 | hdev->log = vhost_log_get(hdev->log_size, |
1549 | vhost_dev_log_is_shared(hdev)); | |
309750fa | 1550 | log_base = (uintptr_t)hdev->log->log; |
c2bea314 | 1551 | r = hdev->vhost_ops->vhost_set_log_base(hdev, |
9a78a5dd MAL |
1552 | hdev->log_size ? log_base : 0, |
1553 | hdev->log); | |
d5970055 | 1554 | if (r < 0) { |
c6409692 | 1555 | VHOST_OPS_DEBUG("vhost_set_log_base failed"); |
d5970055 | 1556 | r = -errno; |
54dd9321 | 1557 | goto fail_log; |
d5970055 MT |
1558 | } |
1559 | } | |
d154e0ba | 1560 | |
c471ad0e JW |
1561 | if (vhost_dev_has_iommu(hdev)) { |
1562 | hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true); | |
1563 | ||
1564 | /* Update used ring information for IOTLB to work correctly, | |
1565 | * vhost-kernel code requires for this.*/ | |
1566 | for (i = 0; i < hdev->nvqs; ++i) { | |
1567 | struct vhost_virtqueue *vq = hdev->vqs + i; | |
1568 | vhost_device_iotlb_miss(hdev, vq->used_phys, true); | |
1569 | } | |
1570 | } | |
d5970055 | 1571 | return 0; |
54dd9321 | 1572 | fail_log: |
24bfa207 | 1573 | vhost_log_put(hdev, false); |
d5970055 MT |
1574 | fail_vq: |
1575 | while (--i >= 0) { | |
f56a1247 | 1576 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1577 | vdev, |
1578 | hdev->vqs + i, | |
1579 | hdev->vq_index + i); | |
d5970055 | 1580 | } |
a9f98bb5 | 1581 | i = hdev->nvqs; |
c471ad0e | 1582 | |
54dd9321 MT |
1583 | fail_mem: |
1584 | fail_features: | |
24f4fe34 MT |
1585 | |
1586 | hdev->started = false; | |
d5970055 MT |
1587 | return r; |
1588 | } | |
1589 | ||
b0b3db79 | 1590 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1591 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1592 | { | |
a9f98bb5 | 1593 | int i; |
54dd9321 | 1594 | |
8695de0f MAL |
1595 | /* should only be called after backend is connected */ |
1596 | assert(hdev->vhost_ops); | |
1597 | ||
d5970055 | 1598 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1599 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1600 | vdev, |
1601 | hdev->vqs + i, | |
1602 | hdev->vq_index + i); | |
d5970055 | 1603 | } |
54dd9321 | 1604 | |
c471ad0e JW |
1605 | if (vhost_dev_has_iommu(hdev)) { |
1606 | hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false); | |
375f74f4 | 1607 | memory_listener_unregister(&hdev->iommu_listener); |
c471ad0e | 1608 | } |
309750fa | 1609 | vhost_log_put(hdev, true); |
d5970055 | 1610 | hdev->started = false; |
c471ad0e | 1611 | hdev->vdev = NULL; |
d5970055 | 1612 | } |
950d94ba MAL |
1613 | |
1614 | int vhost_net_set_backend(struct vhost_dev *hdev, | |
1615 | struct vhost_vring_file *file) | |
1616 | { | |
1617 | if (hdev->vhost_ops->vhost_net_set_backend) { | |
1618 | return hdev->vhost_ops->vhost_net_set_backend(hdev, file); | |
1619 | } | |
1620 | ||
1621 | return -1; | |
1622 | } |