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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" |
0750b060 | 30 | #include "trace.h" |
d5970055 | 31 | |
162bba7f MAL |
32 | /* enabled until disconnected backend stabilizes */ |
33 | #define _VHOST_DEBUG 1 | |
34 | ||
35 | #ifdef _VHOST_DEBUG | |
36 | #define VHOST_OPS_DEBUG(fmt, ...) \ | |
37 | do { error_report(fmt ": %s (%d)", ## __VA_ARGS__, \ | |
38 | strerror(errno), errno); } while (0) | |
39 | #else | |
40 | #define VHOST_OPS_DEBUG(fmt, ...) \ | |
41 | do { } while (0) | |
42 | #endif | |
43 | ||
309750fa | 44 | static struct vhost_log *vhost_log; |
15324404 | 45 | static struct vhost_log *vhost_log_shm; |
309750fa | 46 | |
2ce68e4c IM |
47 | static unsigned int used_memslots; |
48 | static QLIST_HEAD(, vhost_dev) vhost_devices = | |
49 | QLIST_HEAD_INITIALIZER(vhost_devices); | |
50 | ||
51 | bool vhost_has_free_slot(void) | |
52 | { | |
53 | unsigned int slots_limit = ~0U; | |
54 | struct vhost_dev *hdev; | |
55 | ||
56 | QLIST_FOREACH(hdev, &vhost_devices, entry) { | |
57 | unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); | |
58 | slots_limit = MIN(slots_limit, r); | |
59 | } | |
60 | return slots_limit > used_memslots; | |
61 | } | |
62 | ||
d5970055 | 63 | static void vhost_dev_sync_region(struct vhost_dev *dev, |
2817b260 | 64 | MemoryRegionSection *section, |
d5970055 MT |
65 | uint64_t mfirst, uint64_t mlast, |
66 | uint64_t rfirst, uint64_t rlast) | |
67 | { | |
309750fa JW |
68 | vhost_log_chunk_t *log = dev->log->log; |
69 | ||
d5970055 MT |
70 | uint64_t start = MAX(mfirst, rfirst); |
71 | uint64_t end = MIN(mlast, rlast); | |
309750fa JW |
72 | vhost_log_chunk_t *from = log + start / VHOST_LOG_CHUNK; |
73 | vhost_log_chunk_t *to = log + end / VHOST_LOG_CHUNK + 1; | |
33c5793b | 74 | uint64_t addr = QEMU_ALIGN_DOWN(start, VHOST_LOG_CHUNK); |
d5970055 | 75 | |
d5970055 MT |
76 | if (end < start) { |
77 | return; | |
78 | } | |
e314672a | 79 | assert(end / VHOST_LOG_CHUNK < dev->log_size); |
fbbaf9ae | 80 | assert(start / VHOST_LOG_CHUNK < dev->log_size); |
e314672a | 81 | |
d5970055 MT |
82 | for (;from < to; ++from) { |
83 | vhost_log_chunk_t log; | |
d5970055 MT |
84 | /* We first check with non-atomic: much cheaper, |
85 | * and we expect non-dirty to be the common case. */ | |
86 | if (!*from) { | |
0c600ce2 | 87 | addr += VHOST_LOG_CHUNK; |
d5970055 MT |
88 | continue; |
89 | } | |
5444e768 PB |
90 | /* Data must be read atomically. We don't really need barrier semantics |
91 | * but it's easier to use atomic_* than roll our own. */ | |
92 | log = atomic_xchg(from, 0); | |
747eb78b NC |
93 | while (log) { |
94 | int bit = ctzl(log); | |
6b37a23d MT |
95 | hwaddr page_addr; |
96 | hwaddr section_offset; | |
97 | hwaddr mr_offset; | |
6b37a23d MT |
98 | page_addr = addr + bit * VHOST_LOG_PAGE; |
99 | section_offset = page_addr - section->offset_within_address_space; | |
100 | mr_offset = section_offset + section->offset_within_region; | |
101 | memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); | |
d5970055 MT |
102 | log &= ~(0x1ull << bit); |
103 | } | |
104 | addr += VHOST_LOG_CHUNK; | |
105 | } | |
106 | } | |
107 | ||
04097f7c | 108 | static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
2817b260 | 109 | MemoryRegionSection *section, |
6b37a23d MT |
110 | hwaddr first, |
111 | hwaddr last) | |
d5970055 | 112 | { |
d5970055 | 113 | int i; |
6b37a23d MT |
114 | hwaddr start_addr; |
115 | hwaddr end_addr; | |
04097f7c | 116 | |
d5970055 MT |
117 | if (!dev->log_enabled || !dev->started) { |
118 | return 0; | |
119 | } | |
6b37a23d | 120 | start_addr = section->offset_within_address_space; |
052e87b0 | 121 | end_addr = range_get_last(start_addr, int128_get64(section->size)); |
6b37a23d MT |
122 | start_addr = MAX(first, start_addr); |
123 | end_addr = MIN(last, end_addr); | |
124 | ||
d5970055 MT |
125 | for (i = 0; i < dev->mem->nregions; ++i) { |
126 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
2817b260 | 127 | vhost_dev_sync_region(dev, section, start_addr, end_addr, |
d5970055 MT |
128 | reg->guest_phys_addr, |
129 | range_get_last(reg->guest_phys_addr, | |
130 | reg->memory_size)); | |
131 | } | |
132 | for (i = 0; i < dev->nvqs; ++i) { | |
133 | struct vhost_virtqueue *vq = dev->vqs + i; | |
2817b260 | 134 | vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
d5970055 MT |
135 | range_get_last(vq->used_phys, vq->used_size)); |
136 | } | |
137 | return 0; | |
138 | } | |
139 | ||
04097f7c AK |
140 | static void vhost_log_sync(MemoryListener *listener, |
141 | MemoryRegionSection *section) | |
142 | { | |
143 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
144 | memory_listener); | |
6b37a23d MT |
145 | vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
146 | } | |
04097f7c | 147 | |
6b37a23d MT |
148 | static void vhost_log_sync_range(struct vhost_dev *dev, |
149 | hwaddr first, hwaddr last) | |
150 | { | |
151 | int i; | |
152 | /* FIXME: this is N^2 in number of sections */ | |
153 | for (i = 0; i < dev->n_mem_sections; ++i) { | |
154 | MemoryRegionSection *section = &dev->mem_sections[i]; | |
155 | vhost_sync_dirty_bitmap(dev, section, first, last); | |
156 | } | |
04097f7c AK |
157 | } |
158 | ||
d5970055 MT |
159 | /* Assign/unassign. Keep an unsorted array of non-overlapping |
160 | * memory regions in dev->mem. */ | |
161 | static void vhost_dev_unassign_memory(struct vhost_dev *dev, | |
162 | uint64_t start_addr, | |
163 | uint64_t size) | |
164 | { | |
165 | int from, to, n = dev->mem->nregions; | |
166 | /* Track overlapping/split regions for sanity checking. */ | |
167 | int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0; | |
168 | ||
169 | for (from = 0, to = 0; from < n; ++from, ++to) { | |
170 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
171 | uint64_t reglast; | |
172 | uint64_t memlast; | |
173 | uint64_t change; | |
174 | ||
175 | /* clone old region */ | |
176 | if (to != from) { | |
177 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
178 | } | |
179 | ||
180 | /* No overlap is simple */ | |
181 | if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
182 | start_addr, size)) { | |
183 | continue; | |
184 | } | |
185 | ||
186 | /* Split only happens if supplied region | |
187 | * is in the middle of an existing one. Thus it can not | |
188 | * overlap with any other existing region. */ | |
189 | assert(!split); | |
190 | ||
191 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
192 | memlast = range_get_last(start_addr, size); | |
193 | ||
194 | /* Remove whole region */ | |
195 | if (start_addr <= reg->guest_phys_addr && memlast >= reglast) { | |
196 | --dev->mem->nregions; | |
197 | --to; | |
d5970055 MT |
198 | ++overlap_middle; |
199 | continue; | |
200 | } | |
201 | ||
202 | /* Shrink region */ | |
203 | if (memlast >= reglast) { | |
204 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
205 | assert(reg->memory_size); | |
206 | assert(!overlap_end); | |
207 | ++overlap_end; | |
208 | continue; | |
209 | } | |
210 | ||
211 | /* Shift region */ | |
212 | if (start_addr <= reg->guest_phys_addr) { | |
213 | change = memlast + 1 - reg->guest_phys_addr; | |
214 | reg->memory_size -= change; | |
215 | reg->guest_phys_addr += change; | |
216 | reg->userspace_addr += change; | |
217 | assert(reg->memory_size); | |
218 | assert(!overlap_start); | |
219 | ++overlap_start; | |
220 | continue; | |
221 | } | |
222 | ||
223 | /* This only happens if supplied region | |
224 | * is in the middle of an existing one. Thus it can not | |
225 | * overlap with any other existing region. */ | |
226 | assert(!overlap_start); | |
227 | assert(!overlap_end); | |
228 | assert(!overlap_middle); | |
229 | /* Split region: shrink first part, shift second part. */ | |
230 | memcpy(dev->mem->regions + n, reg, sizeof *reg); | |
231 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
232 | assert(reg->memory_size); | |
233 | change = memlast + 1 - reg->guest_phys_addr; | |
234 | reg = dev->mem->regions + n; | |
235 | reg->memory_size -= change; | |
236 | assert(reg->memory_size); | |
237 | reg->guest_phys_addr += change; | |
238 | reg->userspace_addr += change; | |
239 | /* Never add more than 1 region */ | |
240 | assert(dev->mem->nregions == n); | |
241 | ++dev->mem->nregions; | |
242 | ++split; | |
243 | } | |
244 | } | |
245 | ||
246 | /* Called after unassign, so no regions overlap the given range. */ | |
247 | static void vhost_dev_assign_memory(struct vhost_dev *dev, | |
248 | uint64_t start_addr, | |
249 | uint64_t size, | |
250 | uint64_t uaddr) | |
251 | { | |
252 | int from, to; | |
253 | struct vhost_memory_region *merged = NULL; | |
254 | for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) { | |
255 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
256 | uint64_t prlast, urlast; | |
257 | uint64_t pmlast, umlast; | |
258 | uint64_t s, e, u; | |
259 | ||
260 | /* clone old region */ | |
261 | if (to != from) { | |
262 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
263 | } | |
264 | prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
265 | pmlast = range_get_last(start_addr, size); | |
266 | urlast = range_get_last(reg->userspace_addr, reg->memory_size); | |
267 | umlast = range_get_last(uaddr, size); | |
268 | ||
269 | /* check for overlapping regions: should never happen. */ | |
270 | assert(prlast < start_addr || pmlast < reg->guest_phys_addr); | |
271 | /* Not an adjacent or overlapping region - do not merge. */ | |
272 | if ((prlast + 1 != start_addr || urlast + 1 != uaddr) && | |
273 | (pmlast + 1 != reg->guest_phys_addr || | |
274 | umlast + 1 != reg->userspace_addr)) { | |
275 | continue; | |
276 | } | |
277 | ||
ffe42cc1 MT |
278 | if (dev->vhost_ops->vhost_backend_can_merge && |
279 | !dev->vhost_ops->vhost_backend_can_merge(dev, uaddr, size, | |
280 | reg->userspace_addr, | |
281 | reg->memory_size)) { | |
282 | continue; | |
283 | } | |
284 | ||
d5970055 MT |
285 | if (merged) { |
286 | --to; | |
287 | assert(to >= 0); | |
288 | } else { | |
289 | merged = reg; | |
290 | } | |
291 | u = MIN(uaddr, reg->userspace_addr); | |
292 | s = MIN(start_addr, reg->guest_phys_addr); | |
293 | e = MAX(pmlast, prlast); | |
294 | uaddr = merged->userspace_addr = u; | |
295 | start_addr = merged->guest_phys_addr = s; | |
296 | size = merged->memory_size = e - s + 1; | |
297 | assert(merged->memory_size); | |
298 | } | |
299 | ||
300 | if (!merged) { | |
301 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
302 | memset(reg, 0, sizeof *reg); | |
303 | reg->memory_size = size; | |
304 | assert(reg->memory_size); | |
305 | reg->guest_phys_addr = start_addr; | |
306 | reg->userspace_addr = uaddr; | |
307 | ++to; | |
308 | } | |
309 | assert(to <= dev->mem->nregions + 1); | |
310 | dev->mem->nregions = to; | |
311 | } | |
312 | ||
313 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) | |
314 | { | |
315 | uint64_t log_size = 0; | |
316 | int i; | |
317 | for (i = 0; i < dev->mem->nregions; ++i) { | |
318 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
319 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
320 | reg->memory_size); | |
321 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
322 | } | |
323 | for (i = 0; i < dev->nvqs; ++i) { | |
324 | struct vhost_virtqueue *vq = dev->vqs + i; | |
325 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
326 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
327 | } | |
328 | return log_size; | |
329 | } | |
15324404 MAL |
330 | |
331 | static struct vhost_log *vhost_log_alloc(uint64_t size, bool share) | |
309750fa | 332 | { |
15324404 MAL |
333 | struct vhost_log *log; |
334 | uint64_t logsize = size * sizeof(*(log->log)); | |
335 | int fd = -1; | |
336 | ||
337 | log = g_new0(struct vhost_log, 1); | |
338 | if (share) { | |
339 | log->log = qemu_memfd_alloc("vhost-log", logsize, | |
340 | F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, | |
341 | &fd); | |
342 | memset(log->log, 0, logsize); | |
343 | } else { | |
344 | log->log = g_malloc0(logsize); | |
345 | } | |
309750fa JW |
346 | |
347 | log->size = size; | |
348 | log->refcnt = 1; | |
15324404 | 349 | log->fd = fd; |
309750fa JW |
350 | |
351 | return log; | |
352 | } | |
353 | ||
15324404 | 354 | static struct vhost_log *vhost_log_get(uint64_t size, bool share) |
309750fa | 355 | { |
15324404 MAL |
356 | struct vhost_log *log = share ? vhost_log_shm : vhost_log; |
357 | ||
358 | if (!log || log->size != size) { | |
359 | log = vhost_log_alloc(size, share); | |
360 | if (share) { | |
361 | vhost_log_shm = log; | |
362 | } else { | |
363 | vhost_log = log; | |
364 | } | |
309750fa | 365 | } else { |
15324404 | 366 | ++log->refcnt; |
309750fa JW |
367 | } |
368 | ||
15324404 | 369 | return log; |
309750fa JW |
370 | } |
371 | ||
372 | static void vhost_log_put(struct vhost_dev *dev, bool sync) | |
373 | { | |
374 | struct vhost_log *log = dev->log; | |
375 | ||
376 | if (!log) { | |
377 | return; | |
378 | } | |
379 | ||
380 | --log->refcnt; | |
381 | if (log->refcnt == 0) { | |
382 | /* Sync only the range covered by the old log */ | |
383 | if (dev->log_size && sync) { | |
384 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
385 | } | |
15324404 | 386 | |
309750fa | 387 | if (vhost_log == log) { |
15324404 | 388 | g_free(log->log); |
309750fa | 389 | vhost_log = NULL; |
15324404 MAL |
390 | } else if (vhost_log_shm == log) { |
391 | qemu_memfd_free(log->log, log->size * sizeof(*(log->log)), | |
392 | log->fd); | |
393 | vhost_log_shm = NULL; | |
309750fa | 394 | } |
15324404 | 395 | |
309750fa JW |
396 | g_free(log); |
397 | } | |
5c0ba1be FF |
398 | |
399 | dev->log = NULL; | |
400 | dev->log_size = 0; | |
309750fa | 401 | } |
d5970055 | 402 | |
15324404 MAL |
403 | static bool vhost_dev_log_is_shared(struct vhost_dev *dev) |
404 | { | |
405 | return dev->vhost_ops->vhost_requires_shm_log && | |
406 | dev->vhost_ops->vhost_requires_shm_log(dev); | |
407 | } | |
408 | ||
409 | static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t size) | |
d5970055 | 410 | { |
15324404 | 411 | struct vhost_log *log = vhost_log_get(size, vhost_dev_log_is_shared(dev)); |
309750fa | 412 | uint64_t log_base = (uintptr_t)log->log; |
6b37a23d | 413 | int r; |
6528499f | 414 | |
636f4ddd MAL |
415 | /* inform backend of log switching, this must be done before |
416 | releasing the current log, to ensure no logging is lost */ | |
9a78a5dd | 417 | r = dev->vhost_ops->vhost_set_log_base(dev, log_base, log); |
162bba7f MAL |
418 | if (r < 0) { |
419 | VHOST_OPS_DEBUG("vhost_set_log_base failed"); | |
420 | } | |
421 | ||
309750fa | 422 | vhost_log_put(dev, true); |
d5970055 MT |
423 | dev->log = log; |
424 | dev->log_size = size; | |
425 | } | |
426 | ||
c471ad0e JW |
427 | static int vhost_dev_has_iommu(struct vhost_dev *dev) |
428 | { | |
429 | VirtIODevice *vdev = dev->vdev; | |
c471ad0e | 430 | |
375f74f4 | 431 | return virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); |
c471ad0e JW |
432 | } |
433 | ||
434 | static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr, | |
435 | hwaddr *plen, int is_write) | |
436 | { | |
437 | if (!vhost_dev_has_iommu(dev)) { | |
438 | return cpu_physical_memory_map(addr, plen, is_write); | |
439 | } else { | |
440 | return (void *)(uintptr_t)addr; | |
441 | } | |
442 | } | |
443 | ||
444 | static void vhost_memory_unmap(struct vhost_dev *dev, void *buffer, | |
445 | hwaddr len, int is_write, | |
446 | hwaddr access_len) | |
447 | { | |
448 | if (!vhost_dev_has_iommu(dev)) { | |
449 | cpu_physical_memory_unmap(buffer, len, is_write, access_len); | |
450 | } | |
451 | } | |
f1f9e6c5 | 452 | |
c471ad0e JW |
453 | static int vhost_verify_ring_part_mapping(struct vhost_dev *dev, |
454 | void *part, | |
f1f9e6c5 GK |
455 | uint64_t part_addr, |
456 | uint64_t part_size, | |
457 | uint64_t start_addr, | |
458 | uint64_t size) | |
459 | { | |
460 | hwaddr l; | |
461 | void *p; | |
462 | int r = 0; | |
463 | ||
464 | if (!ranges_overlap(start_addr, size, part_addr, part_size)) { | |
465 | return 0; | |
466 | } | |
467 | l = part_size; | |
c471ad0e | 468 | p = vhost_memory_map(dev, part_addr, &l, 1); |
f1f9e6c5 GK |
469 | if (!p || l != part_size) { |
470 | r = -ENOMEM; | |
471 | } | |
472 | if (p != part) { | |
473 | r = -EBUSY; | |
474 | } | |
c471ad0e | 475 | vhost_memory_unmap(dev, p, l, 0, 0); |
f1f9e6c5 GK |
476 | return r; |
477 | } | |
478 | ||
d5970055 MT |
479 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, |
480 | uint64_t start_addr, | |
481 | uint64_t size) | |
482 | { | |
f1f9e6c5 | 483 | int i, j; |
8617343f | 484 | int r = 0; |
f1f9e6c5 GK |
485 | const char *part_name[] = { |
486 | "descriptor table", | |
487 | "available ring", | |
488 | "used ring" | |
489 | }; | |
8617343f | 490 | |
f1f9e6c5 | 491 | for (i = 0; i < dev->nvqs; ++i) { |
d5970055 | 492 | struct vhost_virtqueue *vq = dev->vqs + i; |
d5970055 | 493 | |
f1f9e6c5 | 494 | j = 0; |
c471ad0e | 495 | r = vhost_verify_ring_part_mapping(dev, vq->desc, vq->desc_phys, |
f1f9e6c5 | 496 | vq->desc_size, start_addr, size); |
2fe45ec3 | 497 | if (r) { |
f1f9e6c5 | 498 | break; |
d5970055 | 499 | } |
f1f9e6c5 GK |
500 | |
501 | j++; | |
c471ad0e | 502 | r = vhost_verify_ring_part_mapping(dev, vq->avail, vq->avail_phys, |
f1f9e6c5 | 503 | vq->avail_size, start_addr, size); |
2fe45ec3 | 504 | if (r) { |
f1f9e6c5 | 505 | break; |
d5970055 | 506 | } |
f1f9e6c5 GK |
507 | |
508 | j++; | |
c471ad0e | 509 | r = vhost_verify_ring_part_mapping(dev, vq->used, vq->used_phys, |
f1f9e6c5 | 510 | vq->used_size, start_addr, size); |
2fe45ec3 | 511 | if (r) { |
f1f9e6c5 | 512 | break; |
d5970055 | 513 | } |
f1f9e6c5 GK |
514 | } |
515 | ||
516 | if (r == -ENOMEM) { | |
517 | error_report("Unable to map %s for ring %d", part_name[j], i); | |
518 | } else if (r == -EBUSY) { | |
519 | error_report("%s relocated for ring %d", part_name[j], i); | |
d5970055 | 520 | } |
8617343f | 521 | return r; |
d5970055 MT |
522 | } |
523 | ||
4e789564 MT |
524 | static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
525 | uint64_t start_addr, | |
526 | uint64_t size) | |
527 | { | |
528 | int i, n = dev->mem->nregions; | |
529 | for (i = 0; i < n; ++i) { | |
530 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
531 | if (ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
532 | start_addr, size)) { | |
533 | return reg; | |
534 | } | |
535 | } | |
536 | return NULL; | |
537 | } | |
538 | ||
539 | static bool vhost_dev_cmp_memory(struct vhost_dev *dev, | |
540 | uint64_t start_addr, | |
541 | uint64_t size, | |
542 | uint64_t uaddr) | |
543 | { | |
544 | struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size); | |
545 | uint64_t reglast; | |
546 | uint64_t memlast; | |
547 | ||
548 | if (!reg) { | |
549 | return true; | |
550 | } | |
551 | ||
552 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
553 | memlast = range_get_last(start_addr, size); | |
554 | ||
555 | /* Need to extend region? */ | |
556 | if (start_addr < reg->guest_phys_addr || memlast > reglast) { | |
557 | return true; | |
558 | } | |
559 | /* userspace_addr changed? */ | |
560 | return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr; | |
561 | } | |
562 | ||
04097f7c AK |
563 | static void vhost_set_memory(MemoryListener *listener, |
564 | MemoryRegionSection *section, | |
565 | bool add) | |
d5970055 | 566 | { |
04097f7c AK |
567 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
568 | memory_listener); | |
a8170e5e | 569 | hwaddr start_addr = section->offset_within_address_space; |
052e87b0 | 570 | ram_addr_t size = int128_get64(section->size); |
2d1a35be PB |
571 | bool log_dirty = |
572 | memory_region_get_dirty_log_mask(section->mr) & ~(1 << DIRTY_MEMORY_MIGRATION); | |
d5970055 MT |
573 | int s = offsetof(struct vhost_memory, regions) + |
574 | (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; | |
04097f7c AK |
575 | void *ram; |
576 | ||
7267c094 | 577 | dev->mem = g_realloc(dev->mem, s); |
d5970055 | 578 | |
f5a4e64f | 579 | if (log_dirty) { |
04097f7c | 580 | add = false; |
f5a4e64f MT |
581 | } |
582 | ||
d5970055 MT |
583 | assert(size); |
584 | ||
4e789564 | 585 | /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */ |
d743c382 | 586 | ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
04097f7c AK |
587 | if (add) { |
588 | if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) { | |
4e789564 MT |
589 | /* Region exists with same address. Nothing to do. */ |
590 | return; | |
591 | } | |
592 | } else { | |
593 | if (!vhost_dev_find_reg(dev, start_addr, size)) { | |
594 | /* Removing region that we don't access. Nothing to do. */ | |
595 | return; | |
596 | } | |
597 | } | |
598 | ||
d5970055 | 599 | vhost_dev_unassign_memory(dev, start_addr, size); |
04097f7c | 600 | if (add) { |
d5970055 | 601 | /* Add given mapping, merging adjacent regions if any */ |
04097f7c | 602 | vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
d5970055 MT |
603 | } else { |
604 | /* Remove old mapping for this memory, if any. */ | |
605 | vhost_dev_unassign_memory(dev, start_addr, size); | |
606 | } | |
af603142 NB |
607 | dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); |
608 | dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); | |
609 | dev->memory_changed = true; | |
2ce68e4c | 610 | used_memslots = dev->mem->nregions; |
af603142 NB |
611 | } |
612 | ||
613 | static bool vhost_section(MemoryRegionSection *section) | |
614 | { | |
d56ec1e9 MT |
615 | return memory_region_is_ram(section->mr) && |
616 | !memory_region_is_rom(section->mr); | |
af603142 NB |
617 | } |
618 | ||
619 | static void vhost_begin(MemoryListener *listener) | |
620 | { | |
621 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
622 | memory_listener); | |
623 | dev->mem_changed_end_addr = 0; | |
624 | dev->mem_changed_start_addr = -1; | |
625 | } | |
d5970055 | 626 | |
af603142 NB |
627 | static void vhost_commit(MemoryListener *listener) |
628 | { | |
629 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
630 | memory_listener); | |
631 | hwaddr start_addr = 0; | |
632 | ram_addr_t size = 0; | |
633 | uint64_t log_size; | |
634 | int r; | |
635 | ||
636 | if (!dev->memory_changed) { | |
637 | return; | |
638 | } | |
d5970055 MT |
639 | if (!dev->started) { |
640 | return; | |
641 | } | |
af603142 NB |
642 | if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { |
643 | return; | |
644 | } | |
d5970055 MT |
645 | |
646 | if (dev->started) { | |
af603142 NB |
647 | start_addr = dev->mem_changed_start_addr; |
648 | size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; | |
649 | ||
d5970055 MT |
650 | r = vhost_verify_ring_mappings(dev, start_addr, size); |
651 | assert(r >= 0); | |
652 | } | |
653 | ||
654 | if (!dev->log_enabled) { | |
21e70425 | 655 | r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
162bba7f MAL |
656 | if (r < 0) { |
657 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); | |
658 | } | |
af603142 | 659 | dev->memory_changed = false; |
d5970055 MT |
660 | return; |
661 | } | |
662 | log_size = vhost_get_log_size(dev); | |
663 | /* We allocate an extra 4K bytes to log, | |
664 | * to reduce the * number of reallocations. */ | |
665 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
666 | /* To log more, must increase log size before table update. */ | |
667 | if (dev->log_size < log_size) { | |
668 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
669 | } | |
21e70425 | 670 | r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
162bba7f MAL |
671 | if (r < 0) { |
672 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); | |
673 | } | |
d5970055 MT |
674 | /* To log less, can only decrease log size after table update. */ |
675 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
676 | vhost_dev_log_resize(dev, log_size); | |
677 | } | |
af603142 | 678 | dev->memory_changed = false; |
50c1e149 AK |
679 | } |
680 | ||
04097f7c AK |
681 | static void vhost_region_add(MemoryListener *listener, |
682 | MemoryRegionSection *section) | |
683 | { | |
2817b260 AK |
684 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
685 | memory_listener); | |
686 | ||
c49450b9 AK |
687 | if (!vhost_section(section)) { |
688 | return; | |
689 | } | |
690 | ||
0750b060 | 691 | trace_vhost_region_add(dev, section->mr->name ?: NULL); |
2817b260 AK |
692 | ++dev->n_mem_sections; |
693 | dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, | |
694 | dev->n_mem_sections); | |
695 | dev->mem_sections[dev->n_mem_sections - 1] = *section; | |
dfde4e6e | 696 | memory_region_ref(section->mr); |
04097f7c AK |
697 | vhost_set_memory(listener, section, true); |
698 | } | |
699 | ||
700 | static void vhost_region_del(MemoryListener *listener, | |
701 | MemoryRegionSection *section) | |
702 | { | |
2817b260 AK |
703 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
704 | memory_listener); | |
705 | int i; | |
706 | ||
c49450b9 AK |
707 | if (!vhost_section(section)) { |
708 | return; | |
709 | } | |
710 | ||
0750b060 | 711 | trace_vhost_region_del(dev, section->mr->name ?: NULL); |
04097f7c | 712 | vhost_set_memory(listener, section, false); |
dfde4e6e | 713 | memory_region_unref(section->mr); |
2817b260 AK |
714 | for (i = 0; i < dev->n_mem_sections; ++i) { |
715 | if (dev->mem_sections[i].offset_within_address_space | |
716 | == section->offset_within_address_space) { | |
717 | --dev->n_mem_sections; | |
718 | memmove(&dev->mem_sections[i], &dev->mem_sections[i+1], | |
637f7a6a | 719 | (dev->n_mem_sections - i) * sizeof(*dev->mem_sections)); |
2817b260 AK |
720 | break; |
721 | } | |
722 | } | |
04097f7c AK |
723 | } |
724 | ||
375f74f4 JW |
725 | static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) |
726 | { | |
727 | struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n); | |
728 | struct vhost_dev *hdev = iommu->hdev; | |
729 | hwaddr iova = iotlb->iova + iommu->iommu_offset; | |
730 | ||
020e571b MC |
731 | if (vhost_backend_invalidate_device_iotlb(hdev, iova, |
732 | iotlb->addr_mask + 1)) { | |
375f74f4 JW |
733 | error_report("Fail to invalidate device iotlb"); |
734 | } | |
735 | } | |
736 | ||
737 | static void vhost_iommu_region_add(MemoryListener *listener, | |
738 | MemoryRegionSection *section) | |
739 | { | |
740 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
741 | iommu_listener); | |
742 | struct vhost_iommu *iommu; | |
698feb5e | 743 | Int128 end; |
375f74f4 JW |
744 | |
745 | if (!memory_region_is_iommu(section->mr)) { | |
746 | return; | |
747 | } | |
748 | ||
0750b060 PX |
749 | trace_vhost_iommu_region_add(dev, section->mr->name ?: NULL); |
750 | ||
375f74f4 | 751 | iommu = g_malloc0(sizeof(*iommu)); |
698feb5e PX |
752 | end = int128_add(int128_make64(section->offset_within_region), |
753 | section->size); | |
754 | end = int128_sub(end, int128_one()); | |
755 | iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify, | |
756 | IOMMU_NOTIFIER_UNMAP, | |
757 | section->offset_within_region, | |
758 | int128_get64(end)); | |
375f74f4 JW |
759 | iommu->mr = section->mr; |
760 | iommu->iommu_offset = section->offset_within_address_space - | |
761 | section->offset_within_region; | |
762 | iommu->hdev = dev; | |
763 | memory_region_register_iommu_notifier(section->mr, &iommu->n); | |
764 | QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next); | |
765 | /* TODO: can replay help performance here? */ | |
766 | } | |
767 | ||
768 | static void vhost_iommu_region_del(MemoryListener *listener, | |
769 | MemoryRegionSection *section) | |
770 | { | |
771 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
772 | iommu_listener); | |
773 | struct vhost_iommu *iommu; | |
774 | ||
775 | if (!memory_region_is_iommu(section->mr)) { | |
776 | return; | |
777 | } | |
778 | ||
0750b060 PX |
779 | trace_vhost_iommu_region_del(dev, section->mr->name ?: NULL); |
780 | ||
375f74f4 | 781 | QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) { |
698feb5e PX |
782 | if (iommu->mr == section->mr && |
783 | iommu->n.start == section->offset_within_region) { | |
375f74f4 JW |
784 | memory_region_unregister_iommu_notifier(iommu->mr, |
785 | &iommu->n); | |
786 | QLIST_REMOVE(iommu, iommu_next); | |
787 | g_free(iommu); | |
788 | break; | |
789 | } | |
790 | } | |
791 | } | |
792 | ||
50c1e149 AK |
793 | static void vhost_region_nop(MemoryListener *listener, |
794 | MemoryRegionSection *section) | |
795 | { | |
796 | } | |
797 | ||
d5970055 MT |
798 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
799 | struct vhost_virtqueue *vq, | |
800 | unsigned idx, bool enable_log) | |
801 | { | |
802 | struct vhost_vring_addr addr = { | |
803 | .index = idx, | |
2b3af999 SW |
804 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
805 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
806 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
807 | .log_guest_addr = vq->used_phys, |
808 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
809 | }; | |
21e70425 | 810 | int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr); |
d5970055 | 811 | if (r < 0) { |
c6409692 | 812 | VHOST_OPS_DEBUG("vhost_set_vring_addr failed"); |
d5970055 MT |
813 | return -errno; |
814 | } | |
815 | return 0; | |
816 | } | |
817 | ||
c471ad0e JW |
818 | static int vhost_dev_set_features(struct vhost_dev *dev, |
819 | bool enable_log) | |
d5970055 MT |
820 | { |
821 | uint64_t features = dev->acked_features; | |
822 | int r; | |
823 | if (enable_log) { | |
9a2ba823 | 824 | features |= 0x1ULL << VHOST_F_LOG_ALL; |
d5970055 | 825 | } |
21e70425 | 826 | r = dev->vhost_ops->vhost_set_features(dev, features); |
c6409692 MAL |
827 | if (r < 0) { |
828 | VHOST_OPS_DEBUG("vhost_set_features failed"); | |
829 | } | |
d5970055 MT |
830 | return r < 0 ? -errno : 0; |
831 | } | |
832 | ||
833 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
834 | { | |
162bba7f | 835 | int r, i, idx; |
d5970055 MT |
836 | r = vhost_dev_set_features(dev, enable_log); |
837 | if (r < 0) { | |
838 | goto err_features; | |
839 | } | |
840 | for (i = 0; i < dev->nvqs; ++i) { | |
25a2a920 TC |
841 | idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
842 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, | |
d5970055 MT |
843 | enable_log); |
844 | if (r < 0) { | |
845 | goto err_vq; | |
846 | } | |
847 | } | |
848 | return 0; | |
849 | err_vq: | |
850 | for (; i >= 0; --i) { | |
25a2a920 | 851 | idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
162bba7f MAL |
852 | vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, |
853 | dev->log_enabled); | |
d5970055 | 854 | } |
162bba7f | 855 | vhost_dev_set_features(dev, dev->log_enabled); |
d5970055 MT |
856 | err_features: |
857 | return r; | |
858 | } | |
859 | ||
04097f7c | 860 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 861 | { |
04097f7c AK |
862 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
863 | memory_listener); | |
d5970055 MT |
864 | int r; |
865 | if (!!enable == dev->log_enabled) { | |
866 | return 0; | |
867 | } | |
868 | if (!dev->started) { | |
869 | dev->log_enabled = enable; | |
870 | return 0; | |
871 | } | |
872 | if (!enable) { | |
873 | r = vhost_dev_set_log(dev, false); | |
874 | if (r < 0) { | |
875 | return r; | |
876 | } | |
309750fa | 877 | vhost_log_put(dev, false); |
d5970055 MT |
878 | } else { |
879 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
880 | r = vhost_dev_set_log(dev, true); | |
881 | if (r < 0) { | |
882 | return r; | |
883 | } | |
884 | } | |
885 | dev->log_enabled = enable; | |
886 | return 0; | |
887 | } | |
888 | ||
04097f7c AK |
889 | static void vhost_log_global_start(MemoryListener *listener) |
890 | { | |
891 | int r; | |
892 | ||
893 | r = vhost_migration_log(listener, true); | |
894 | if (r < 0) { | |
895 | abort(); | |
896 | } | |
897 | } | |
898 | ||
899 | static void vhost_log_global_stop(MemoryListener *listener) | |
900 | { | |
901 | int r; | |
902 | ||
903 | r = vhost_migration_log(listener, false); | |
904 | if (r < 0) { | |
905 | abort(); | |
906 | } | |
907 | } | |
908 | ||
909 | static void vhost_log_start(MemoryListener *listener, | |
b2dfd71c PB |
910 | MemoryRegionSection *section, |
911 | int old, int new) | |
04097f7c AK |
912 | { |
913 | /* FIXME: implement */ | |
914 | } | |
915 | ||
916 | static void vhost_log_stop(MemoryListener *listener, | |
b2dfd71c PB |
917 | MemoryRegionSection *section, |
918 | int old, int new) | |
04097f7c AK |
919 | { |
920 | /* FIXME: implement */ | |
921 | } | |
922 | ||
46f70ff1 GK |
923 | /* The vhost driver natively knows how to handle the vrings of non |
924 | * cross-endian legacy devices and modern devices. Only legacy devices | |
925 | * exposed to a bi-endian guest may require the vhost driver to use a | |
926 | * specific endianness. | |
927 | */ | |
a122ab24 GK |
928 | static inline bool vhost_needs_vring_endian(VirtIODevice *vdev) |
929 | { | |
e5848123 GK |
930 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
931 | return false; | |
932 | } | |
a122ab24 | 933 | #ifdef HOST_WORDS_BIGENDIAN |
46f70ff1 | 934 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE; |
a122ab24 | 935 | #else |
46f70ff1 | 936 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; |
a122ab24 | 937 | #endif |
a122ab24 GK |
938 | } |
939 | ||
04b7a152 GK |
940 | static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, |
941 | bool is_big_endian, | |
942 | int vhost_vq_index) | |
943 | { | |
944 | struct vhost_vring_state s = { | |
945 | .index = vhost_vq_index, | |
946 | .num = is_big_endian | |
947 | }; | |
948 | ||
21e70425 | 949 | if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) { |
04b7a152 GK |
950 | return 0; |
951 | } | |
952 | ||
c6409692 | 953 | VHOST_OPS_DEBUG("vhost_set_vring_endian failed"); |
04b7a152 GK |
954 | if (errno == ENOTTY) { |
955 | error_report("vhost does not support cross-endian"); | |
956 | return -ENOSYS; | |
957 | } | |
958 | ||
959 | return -errno; | |
960 | } | |
961 | ||
c471ad0e JW |
962 | static int vhost_memory_region_lookup(struct vhost_dev *hdev, |
963 | uint64_t gpa, uint64_t *uaddr, | |
964 | uint64_t *len) | |
965 | { | |
966 | int i; | |
967 | ||
968 | for (i = 0; i < hdev->mem->nregions; i++) { | |
969 | struct vhost_memory_region *reg = hdev->mem->regions + i; | |
970 | ||
971 | if (gpa >= reg->guest_phys_addr && | |
972 | reg->guest_phys_addr + reg->memory_size > gpa) { | |
973 | *uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr; | |
974 | *len = reg->guest_phys_addr + reg->memory_size - gpa; | |
975 | return 0; | |
976 | } | |
977 | } | |
978 | ||
979 | return -EFAULT; | |
980 | } | |
981 | ||
fc58bd0d | 982 | int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write) |
c471ad0e JW |
983 | { |
984 | IOMMUTLBEntry iotlb; | |
985 | uint64_t uaddr, len; | |
fc58bd0d | 986 | int ret = -EFAULT; |
c471ad0e JW |
987 | |
988 | rcu_read_lock(); | |
989 | ||
990 | iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as, | |
991 | iova, write); | |
992 | if (iotlb.target_as != NULL) { | |
fc58bd0d MC |
993 | ret = vhost_memory_region_lookup(dev, iotlb.translated_addr, |
994 | &uaddr, &len); | |
995 | if (ret) { | |
c471ad0e JW |
996 | error_report("Fail to lookup the translated address " |
997 | "%"PRIx64, iotlb.translated_addr); | |
998 | goto out; | |
999 | } | |
1000 | ||
1001 | len = MIN(iotlb.addr_mask + 1, len); | |
1002 | iova = iova & ~iotlb.addr_mask; | |
1003 | ||
020e571b MC |
1004 | ret = vhost_backend_update_device_iotlb(dev, iova, uaddr, |
1005 | len, iotlb.perm); | |
fc58bd0d | 1006 | if (ret) { |
c471ad0e JW |
1007 | error_report("Fail to update device iotlb"); |
1008 | goto out; | |
1009 | } | |
1010 | } | |
1011 | out: | |
1012 | rcu_read_unlock(); | |
fc58bd0d MC |
1013 | |
1014 | return ret; | |
c471ad0e JW |
1015 | } |
1016 | ||
f56a1247 | 1017 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
1018 | struct VirtIODevice *vdev, |
1019 | struct vhost_virtqueue *vq, | |
1020 | unsigned idx) | |
1021 | { | |
96a3d98d JW |
1022 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
1023 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
1024 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
a8170e5e | 1025 | hwaddr s, l, a; |
d5970055 | 1026 | int r; |
21e70425 | 1027 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
d5970055 | 1028 | struct vhost_vring_file file = { |
a9f98bb5 | 1029 | .index = vhost_vq_index |
d5970055 MT |
1030 | }; |
1031 | struct vhost_vring_state state = { | |
a9f98bb5 | 1032 | .index = vhost_vq_index |
d5970055 MT |
1033 | }; |
1034 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
1035 | ||
a9f98bb5 | 1036 | |
d5970055 | 1037 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
21e70425 | 1038 | r = dev->vhost_ops->vhost_set_vring_num(dev, &state); |
d5970055 | 1039 | if (r) { |
c6409692 | 1040 | VHOST_OPS_DEBUG("vhost_set_vring_num failed"); |
d5970055 MT |
1041 | return -errno; |
1042 | } | |
1043 | ||
1044 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
21e70425 | 1045 | r = dev->vhost_ops->vhost_set_vring_base(dev, &state); |
d5970055 | 1046 | if (r) { |
c6409692 | 1047 | VHOST_OPS_DEBUG("vhost_set_vring_base failed"); |
d5970055 MT |
1048 | return -errno; |
1049 | } | |
1050 | ||
e5848123 | 1051 | if (vhost_needs_vring_endian(vdev)) { |
04b7a152 GK |
1052 | r = vhost_virtqueue_set_vring_endian_legacy(dev, |
1053 | virtio_is_big_endian(vdev), | |
1054 | vhost_vq_index); | |
1055 | if (r) { | |
1056 | return -errno; | |
1057 | } | |
1058 | } | |
1059 | ||
f1f9e6c5 GK |
1060 | vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx); |
1061 | vq->desc_phys = a = virtio_queue_get_desc_addr(vdev, idx); | |
c471ad0e | 1062 | vq->desc = vhost_memory_map(dev, a, &l, 0); |
d5970055 MT |
1063 | if (!vq->desc || l != s) { |
1064 | r = -ENOMEM; | |
1065 | goto fail_alloc_desc; | |
1066 | } | |
f1f9e6c5 GK |
1067 | vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx); |
1068 | vq->avail_phys = a = virtio_queue_get_avail_addr(vdev, idx); | |
c471ad0e | 1069 | vq->avail = vhost_memory_map(dev, a, &l, 0); |
d5970055 MT |
1070 | if (!vq->avail || l != s) { |
1071 | r = -ENOMEM; | |
1072 | goto fail_alloc_avail; | |
1073 | } | |
1074 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
1075 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
c471ad0e | 1076 | vq->used = vhost_memory_map(dev, a, &l, 1); |
d5970055 MT |
1077 | if (!vq->used || l != s) { |
1078 | r = -ENOMEM; | |
1079 | goto fail_alloc_used; | |
1080 | } | |
1081 | ||
a9f98bb5 | 1082 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
1083 | if (r < 0) { |
1084 | r = -errno; | |
1085 | goto fail_alloc; | |
1086 | } | |
a9f98bb5 | 1087 | |
d5970055 | 1088 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
21e70425 | 1089 | r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); |
d5970055 | 1090 | if (r) { |
c6409692 | 1091 | VHOST_OPS_DEBUG("vhost_set_vring_kick failed"); |
c8852121 | 1092 | r = -errno; |
d5970055 MT |
1093 | goto fail_kick; |
1094 | } | |
1095 | ||
f56a1247 MT |
1096 | /* Clear and discard previous events if any. */ |
1097 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 | 1098 | |
5669655a VK |
1099 | /* Init vring in unmasked state, unless guest_notifier_mask |
1100 | * will do it later. | |
1101 | */ | |
1102 | if (!vdev->use_guest_notifier_mask) { | |
1103 | /* TODO: check and handle errors. */ | |
1104 | vhost_virtqueue_mask(dev, vdev, idx, false); | |
1105 | } | |
1106 | ||
96a3d98d JW |
1107 | if (k->query_guest_notifiers && |
1108 | k->query_guest_notifiers(qbus->parent) && | |
1109 | virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) { | |
1110 | file.fd = -1; | |
1111 | r = dev->vhost_ops->vhost_set_vring_call(dev, &file); | |
1112 | if (r) { | |
1113 | goto fail_vector; | |
1114 | } | |
1115 | } | |
1116 | ||
d5970055 MT |
1117 | return 0; |
1118 | ||
96a3d98d | 1119 | fail_vector: |
d5970055 | 1120 | fail_kick: |
d5970055 | 1121 | fail_alloc: |
c471ad0e JW |
1122 | vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
1123 | 0, 0); | |
d5970055 | 1124 | fail_alloc_used: |
c471ad0e JW |
1125 | vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), |
1126 | 0, 0); | |
d5970055 | 1127 | fail_alloc_avail: |
c471ad0e JW |
1128 | vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), |
1129 | 0, 0); | |
d5970055 MT |
1130 | fail_alloc_desc: |
1131 | return r; | |
1132 | } | |
1133 | ||
f56a1247 | 1134 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
1135 | struct VirtIODevice *vdev, |
1136 | struct vhost_virtqueue *vq, | |
1137 | unsigned idx) | |
1138 | { | |
21e70425 | 1139 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
d5970055 | 1140 | struct vhost_vring_state state = { |
04b7a152 | 1141 | .index = vhost_vq_index, |
d5970055 MT |
1142 | }; |
1143 | int r; | |
fc57fd99 | 1144 | |
21e70425 | 1145 | r = dev->vhost_ops->vhost_get_vring_base(dev, &state); |
d5970055 | 1146 | if (r < 0) { |
c6409692 | 1147 | VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r); |
2ae39a11 MC |
1148 | /* Connection to the backend is broken, so let's sync internal |
1149 | * last avail idx to the device used idx. | |
1150 | */ | |
1151 | virtio_queue_restore_last_avail_idx(vdev, idx); | |
499c5579 MAL |
1152 | } else { |
1153 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
d5970055 | 1154 | } |
3561ba14 | 1155 | virtio_queue_invalidate_signalled_used(vdev, idx); |
aa94d521 | 1156 | virtio_queue_update_used_idx(vdev, idx); |
04b7a152 GK |
1157 | |
1158 | /* In the cross-endian case, we need to reset the vring endianness to | |
1159 | * native as legacy devices expect so by default. | |
1160 | */ | |
e5848123 | 1161 | if (vhost_needs_vring_endian(vdev)) { |
162bba7f MAL |
1162 | vhost_virtqueue_set_vring_endian_legacy(dev, |
1163 | !virtio_is_big_endian(vdev), | |
1164 | vhost_vq_index); | |
04b7a152 GK |
1165 | } |
1166 | ||
c471ad0e JW |
1167 | vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
1168 | 1, virtio_queue_get_used_size(vdev, idx)); | |
1169 | vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
1170 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
1171 | vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
1172 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
d5970055 MT |
1173 | } |
1174 | ||
80a1ea37 AK |
1175 | static void vhost_eventfd_add(MemoryListener *listener, |
1176 | MemoryRegionSection *section, | |
753d5e14 | 1177 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
1178 | { |
1179 | } | |
1180 | ||
1181 | static void vhost_eventfd_del(MemoryListener *listener, | |
1182 | MemoryRegionSection *section, | |
753d5e14 | 1183 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
1184 | { |
1185 | } | |
1186 | ||
69e87b32 JW |
1187 | static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev, |
1188 | int n, uint32_t timeout) | |
1189 | { | |
1190 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); | |
1191 | struct vhost_vring_state state = { | |
1192 | .index = vhost_vq_index, | |
1193 | .num = timeout, | |
1194 | }; | |
1195 | int r; | |
1196 | ||
1197 | if (!dev->vhost_ops->vhost_set_vring_busyloop_timeout) { | |
1198 | return -EINVAL; | |
1199 | } | |
1200 | ||
1201 | r = dev->vhost_ops->vhost_set_vring_busyloop_timeout(dev, &state); | |
1202 | if (r) { | |
c6409692 | 1203 | VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed"); |
69e87b32 JW |
1204 | return r; |
1205 | } | |
1206 | ||
1207 | return 0; | |
1208 | } | |
1209 | ||
f56a1247 MT |
1210 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
1211 | struct vhost_virtqueue *vq, int n) | |
1212 | { | |
21e70425 | 1213 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); |
f56a1247 | 1214 | struct vhost_vring_file file = { |
b931bfbf | 1215 | .index = vhost_vq_index, |
f56a1247 MT |
1216 | }; |
1217 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
1218 | if (r < 0) { | |
1219 | return r; | |
1220 | } | |
1221 | ||
1222 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
21e70425 | 1223 | r = dev->vhost_ops->vhost_set_vring_call(dev, &file); |
f56a1247 | 1224 | if (r) { |
c6409692 | 1225 | VHOST_OPS_DEBUG("vhost_set_vring_call failed"); |
f56a1247 MT |
1226 | r = -errno; |
1227 | goto fail_call; | |
1228 | } | |
c471ad0e JW |
1229 | |
1230 | vq->dev = dev; | |
1231 | ||
f56a1247 MT |
1232 | return 0; |
1233 | fail_call: | |
1234 | event_notifier_cleanup(&vq->masked_notifier); | |
1235 | return r; | |
1236 | } | |
1237 | ||
1238 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
1239 | { | |
1240 | event_notifier_cleanup(&vq->masked_notifier); | |
1241 | } | |
1242 | ||
81647a65 | 1243 | int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
69e87b32 | 1244 | VhostBackendType backend_type, uint32_t busyloop_timeout) |
d5970055 MT |
1245 | { |
1246 | uint64_t features; | |
a06db3ec | 1247 | int i, r, n_initialized_vqs = 0; |
fe44dc91 | 1248 | Error *local_err = NULL; |
81647a65 | 1249 | |
c471ad0e | 1250 | hdev->vdev = NULL; |
d2fc4402 MAL |
1251 | hdev->migration_blocker = NULL; |
1252 | ||
7cb8a9b9 MAL |
1253 | r = vhost_set_backend_type(hdev, backend_type); |
1254 | assert(r >= 0); | |
1a1bfac9 | 1255 | |
7cb8a9b9 MAL |
1256 | r = hdev->vhost_ops->vhost_backend_init(hdev, opaque); |
1257 | if (r < 0) { | |
1258 | goto fail; | |
24d1eb33 NN |
1259 | } |
1260 | ||
aebf8168 | 1261 | if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { |
4afba631 MAL |
1262 | error_report("vhost backend memory slots limit is less" |
1263 | " than current number of present memory slots"); | |
7cb8a9b9 MAL |
1264 | r = -1; |
1265 | goto fail; | |
aebf8168 | 1266 | } |
2ce68e4c | 1267 | |
21e70425 | 1268 | r = hdev->vhost_ops->vhost_set_owner(hdev); |
d5970055 | 1269 | if (r < 0) { |
c6409692 | 1270 | VHOST_OPS_DEBUG("vhost_set_owner failed"); |
d5970055 MT |
1271 | goto fail; |
1272 | } | |
1273 | ||
21e70425 | 1274 | r = hdev->vhost_ops->vhost_get_features(hdev, &features); |
d5970055 | 1275 | if (r < 0) { |
c6409692 | 1276 | VHOST_OPS_DEBUG("vhost_get_features failed"); |
d5970055 MT |
1277 | goto fail; |
1278 | } | |
f56a1247 | 1279 | |
a06db3ec | 1280 | for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) { |
b931bfbf | 1281 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); |
f56a1247 | 1282 | if (r < 0) { |
a06db3ec | 1283 | goto fail; |
f56a1247 MT |
1284 | } |
1285 | } | |
69e87b32 JW |
1286 | |
1287 | if (busyloop_timeout) { | |
1288 | for (i = 0; i < hdev->nvqs; ++i) { | |
1289 | r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, | |
1290 | busyloop_timeout); | |
1291 | if (r < 0) { | |
1292 | goto fail_busyloop; | |
1293 | } | |
1294 | } | |
1295 | } | |
1296 | ||
d5970055 MT |
1297 | hdev->features = features; |
1298 | ||
04097f7c | 1299 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
1300 | .begin = vhost_begin, |
1301 | .commit = vhost_commit, | |
04097f7c AK |
1302 | .region_add = vhost_region_add, |
1303 | .region_del = vhost_region_del, | |
50c1e149 | 1304 | .region_nop = vhost_region_nop, |
04097f7c AK |
1305 | .log_start = vhost_log_start, |
1306 | .log_stop = vhost_log_stop, | |
1307 | .log_sync = vhost_log_sync, | |
1308 | .log_global_start = vhost_log_global_start, | |
1309 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
1310 | .eventfd_add = vhost_eventfd_add, |
1311 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 1312 | .priority = 10 |
04097f7c | 1313 | }; |
d2fc4402 | 1314 | |
375f74f4 JW |
1315 | hdev->iommu_listener = (MemoryListener) { |
1316 | .region_add = vhost_iommu_region_add, | |
1317 | .region_del = vhost_iommu_region_del, | |
1318 | }; | |
c471ad0e | 1319 | |
d2fc4402 MAL |
1320 | if (hdev->migration_blocker == NULL) { |
1321 | if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { | |
1322 | error_setg(&hdev->migration_blocker, | |
1323 | "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); | |
0d34fbab | 1324 | } else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_check()) { |
31190ed7 MAL |
1325 | error_setg(&hdev->migration_blocker, |
1326 | "Migration disabled: failed to allocate shared memory"); | |
d2fc4402 MAL |
1327 | } |
1328 | } | |
1329 | ||
1330 | if (hdev->migration_blocker != NULL) { | |
fe44dc91 AA |
1331 | r = migrate_add_blocker(hdev->migration_blocker, &local_err); |
1332 | if (local_err) { | |
1333 | error_report_err(local_err); | |
1334 | error_free(hdev->migration_blocker); | |
1335 | goto fail_busyloop; | |
1336 | } | |
7145872e | 1337 | } |
d2fc4402 | 1338 | |
7267c094 | 1339 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
1340 | hdev->n_mem_sections = 0; |
1341 | hdev->mem_sections = NULL; | |
d5970055 MT |
1342 | hdev->log = NULL; |
1343 | hdev->log_size = 0; | |
1344 | hdev->log_enabled = false; | |
1345 | hdev->started = false; | |
af603142 | 1346 | hdev->memory_changed = false; |
f6790af6 | 1347 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
5be5f9be | 1348 | QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); |
d5970055 | 1349 | return 0; |
a06db3ec | 1350 | |
69e87b32 JW |
1351 | fail_busyloop: |
1352 | while (--i >= 0) { | |
1353 | vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0); | |
1354 | } | |
d5970055 | 1355 | fail: |
a06db3ec MAL |
1356 | hdev->nvqs = n_initialized_vqs; |
1357 | vhost_dev_cleanup(hdev); | |
d5970055 MT |
1358 | return r; |
1359 | } | |
1360 | ||
1361 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
1362 | { | |
f56a1247 | 1363 | int i; |
e0547b59 | 1364 | |
f56a1247 MT |
1365 | for (i = 0; i < hdev->nvqs; ++i) { |
1366 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
1367 | } | |
5be5f9be MAL |
1368 | if (hdev->mem) { |
1369 | /* those are only safe after successful init */ | |
1370 | memory_listener_unregister(&hdev->memory_listener); | |
1371 | QLIST_REMOVE(hdev, entry); | |
1372 | } | |
7145872e MT |
1373 | if (hdev->migration_blocker) { |
1374 | migrate_del_blocker(hdev->migration_blocker); | |
1375 | error_free(hdev->migration_blocker); | |
1376 | } | |
7267c094 | 1377 | g_free(hdev->mem); |
2817b260 | 1378 | g_free(hdev->mem_sections); |
e0547b59 MAL |
1379 | if (hdev->vhost_ops) { |
1380 | hdev->vhost_ops->vhost_backend_cleanup(hdev); | |
1381 | } | |
7b527247 | 1382 | assert(!hdev->log); |
e0547b59 MAL |
1383 | |
1384 | memset(hdev, 0, sizeof(struct vhost_dev)); | |
d5970055 MT |
1385 | } |
1386 | ||
b0b3db79 MT |
1387 | /* Stop processing guest IO notifications in qemu. |
1388 | * Start processing them in vhost in kernel. | |
1389 | */ | |
1390 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1391 | { | |
1c819449 | 1392 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
16617e36 | 1393 | int i, r, e; |
4afba631 | 1394 | |
310837de PB |
1395 | /* We will pass the notifiers to the kernel, make sure that QEMU |
1396 | * doesn't interfere. | |
1397 | */ | |
1398 | r = virtio_device_grab_ioeventfd(vdev); | |
1399 | if (r < 0) { | |
4afba631 | 1400 | error_report("binding does not support host notifiers"); |
b0b3db79 MT |
1401 | goto fail; |
1402 | } | |
1403 | ||
1404 | for (i = 0; i < hdev->nvqs; ++i) { | |
b1f0a33d CH |
1405 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1406 | true); | |
b0b3db79 | 1407 | if (r < 0) { |
4afba631 | 1408 | error_report("vhost VQ %d notifier binding failed: %d", i, -r); |
b0b3db79 MT |
1409 | goto fail_vq; |
1410 | } | |
1411 | } | |
1412 | ||
1413 | return 0; | |
1414 | fail_vq: | |
1415 | while (--i >= 0) { | |
b1f0a33d CH |
1416 | e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1417 | false); | |
16617e36 | 1418 | if (e < 0) { |
4afba631 | 1419 | error_report("vhost VQ %d notifier cleanup error: %d", i, -r); |
b0b3db79 | 1420 | } |
16617e36 | 1421 | assert (e >= 0); |
b0b3db79 | 1422 | } |
310837de | 1423 | virtio_device_release_ioeventfd(vdev); |
b0b3db79 MT |
1424 | fail: |
1425 | return r; | |
1426 | } | |
1427 | ||
1428 | /* Stop processing guest IO notifications in vhost. | |
1429 | * Start processing them in qemu. | |
1430 | * This might actually run the qemu handlers right away, | |
1431 | * so virtio in qemu must be completely setup when this is called. | |
1432 | */ | |
1433 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1434 | { | |
1c819449 | 1435 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
b0b3db79 MT |
1436 | int i, r; |
1437 | ||
1438 | for (i = 0; i < hdev->nvqs; ++i) { | |
b1f0a33d CH |
1439 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1440 | false); | |
b0b3db79 | 1441 | if (r < 0) { |
4afba631 | 1442 | error_report("vhost VQ %d notifier cleanup failed: %d", i, -r); |
b0b3db79 MT |
1443 | } |
1444 | assert (r >= 0); | |
1445 | } | |
310837de | 1446 | virtio_device_release_ioeventfd(vdev); |
b0b3db79 MT |
1447 | } |
1448 | ||
f56a1247 MT |
1449 | /* Test and clear event pending status. |
1450 | * Should be called after unmask to avoid losing events. | |
1451 | */ | |
1452 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
1453 | { | |
a9f98bb5 | 1454 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
a9f98bb5 | 1455 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
1456 | return event_notifier_test_and_clear(&vq->masked_notifier); |
1457 | } | |
1458 | ||
1459 | /* Mask/unmask events from this vq. */ | |
1460 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
1461 | bool mask) | |
1462 | { | |
1463 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 1464 | int r, index = n - hdev->vq_index; |
fc57fd99 | 1465 | struct vhost_vring_file file; |
f56a1247 | 1466 | |
8695de0f MAL |
1467 | /* should only be called after backend is connected */ |
1468 | assert(hdev->vhost_ops); | |
1469 | ||
f56a1247 | 1470 | if (mask) { |
5669655a | 1471 | assert(vdev->use_guest_notifier_mask); |
a9f98bb5 | 1472 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
1473 | } else { |
1474 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
1475 | } | |
fc57fd99 | 1476 | |
21e70425 MAL |
1477 | file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n); |
1478 | r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file); | |
162bba7f MAL |
1479 | if (r < 0) { |
1480 | VHOST_OPS_DEBUG("vhost_set_vring_call failed"); | |
1481 | } | |
f56a1247 MT |
1482 | } |
1483 | ||
9a2ba823 CH |
1484 | uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
1485 | uint64_t features) | |
2e6d46d7 NN |
1486 | { |
1487 | const int *bit = feature_bits; | |
1488 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1489 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1490 | if (!(hdev->features & bit_mask)) { |
1491 | features &= ~bit_mask; | |
1492 | } | |
1493 | bit++; | |
1494 | } | |
1495 | return features; | |
1496 | } | |
1497 | ||
1498 | void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, | |
9a2ba823 | 1499 | uint64_t features) |
2e6d46d7 NN |
1500 | { |
1501 | const int *bit = feature_bits; | |
1502 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1503 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1504 | if (features & bit_mask) { |
1505 | hdev->acked_features |= bit_mask; | |
1506 | } | |
1507 | bit++; | |
1508 | } | |
1509 | } | |
1510 | ||
4c3e257b CL |
1511 | int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, |
1512 | uint32_t config_len) | |
1513 | { | |
1514 | assert(hdev->vhost_ops); | |
1515 | ||
1516 | if (hdev->vhost_ops->vhost_get_config) { | |
1517 | return hdev->vhost_ops->vhost_get_config(hdev, config, config_len); | |
1518 | } | |
1519 | ||
1520 | return -1; | |
1521 | } | |
1522 | ||
1523 | int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data, | |
1524 | uint32_t offset, uint32_t size, uint32_t flags) | |
1525 | { | |
1526 | assert(hdev->vhost_ops); | |
1527 | ||
1528 | if (hdev->vhost_ops->vhost_set_config) { | |
1529 | return hdev->vhost_ops->vhost_set_config(hdev, data, offset, | |
1530 | size, flags); | |
1531 | } | |
1532 | ||
1533 | return -1; | |
1534 | } | |
1535 | ||
1536 | void vhost_dev_set_config_notifier(struct vhost_dev *hdev, | |
1537 | const VhostDevConfigOps *ops) | |
1538 | { | |
1539 | assert(hdev->vhost_ops); | |
1540 | hdev->config_ops = ops; | |
1541 | } | |
1542 | ||
b0b3db79 | 1543 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1544 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1545 | { | |
1546 | int i, r; | |
24f4fe34 | 1547 | |
8695de0f MAL |
1548 | /* should only be called after backend is connected */ |
1549 | assert(hdev->vhost_ops); | |
1550 | ||
24f4fe34 | 1551 | hdev->started = true; |
c471ad0e | 1552 | hdev->vdev = vdev; |
24f4fe34 | 1553 | |
d5970055 MT |
1554 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1555 | if (r < 0) { | |
54dd9321 | 1556 | goto fail_features; |
d5970055 | 1557 | } |
c471ad0e JW |
1558 | |
1559 | if (vhost_dev_has_iommu(hdev)) { | |
375f74f4 | 1560 | memory_listener_register(&hdev->iommu_listener, vdev->dma_as); |
c471ad0e JW |
1561 | } |
1562 | ||
21e70425 | 1563 | r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem); |
d5970055 | 1564 | if (r < 0) { |
c6409692 | 1565 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); |
d5970055 | 1566 | r = -errno; |
54dd9321 | 1567 | goto fail_mem; |
d5970055 | 1568 | } |
d154e0ba | 1569 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1570 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1571 | vdev, |
1572 | hdev->vqs + i, | |
1573 | hdev->vq_index + i); | |
d154e0ba MT |
1574 | if (r < 0) { |
1575 | goto fail_vq; | |
1576 | } | |
1577 | } | |
1578 | ||
d5970055 | 1579 | if (hdev->log_enabled) { |
e05ca820 MT |
1580 | uint64_t log_base; |
1581 | ||
d5970055 | 1582 | hdev->log_size = vhost_get_log_size(hdev); |
15324404 MAL |
1583 | hdev->log = vhost_log_get(hdev->log_size, |
1584 | vhost_dev_log_is_shared(hdev)); | |
309750fa | 1585 | log_base = (uintptr_t)hdev->log->log; |
c2bea314 | 1586 | r = hdev->vhost_ops->vhost_set_log_base(hdev, |
9a78a5dd MAL |
1587 | hdev->log_size ? log_base : 0, |
1588 | hdev->log); | |
d5970055 | 1589 | if (r < 0) { |
c6409692 | 1590 | VHOST_OPS_DEBUG("vhost_set_log_base failed"); |
d5970055 | 1591 | r = -errno; |
54dd9321 | 1592 | goto fail_log; |
d5970055 MT |
1593 | } |
1594 | } | |
d154e0ba | 1595 | |
c471ad0e JW |
1596 | if (vhost_dev_has_iommu(hdev)) { |
1597 | hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true); | |
1598 | ||
1599 | /* Update used ring information for IOTLB to work correctly, | |
1600 | * vhost-kernel code requires for this.*/ | |
1601 | for (i = 0; i < hdev->nvqs; ++i) { | |
1602 | struct vhost_virtqueue *vq = hdev->vqs + i; | |
1603 | vhost_device_iotlb_miss(hdev, vq->used_phys, true); | |
1604 | } | |
1605 | } | |
d5970055 | 1606 | return 0; |
54dd9321 | 1607 | fail_log: |
24bfa207 | 1608 | vhost_log_put(hdev, false); |
d5970055 MT |
1609 | fail_vq: |
1610 | while (--i >= 0) { | |
f56a1247 | 1611 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1612 | vdev, |
1613 | hdev->vqs + i, | |
1614 | hdev->vq_index + i); | |
d5970055 | 1615 | } |
a9f98bb5 | 1616 | i = hdev->nvqs; |
c471ad0e | 1617 | |
54dd9321 MT |
1618 | fail_mem: |
1619 | fail_features: | |
24f4fe34 MT |
1620 | |
1621 | hdev->started = false; | |
d5970055 MT |
1622 | return r; |
1623 | } | |
1624 | ||
b0b3db79 | 1625 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1626 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1627 | { | |
a9f98bb5 | 1628 | int i; |
54dd9321 | 1629 | |
8695de0f MAL |
1630 | /* should only be called after backend is connected */ |
1631 | assert(hdev->vhost_ops); | |
1632 | ||
d5970055 | 1633 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1634 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1635 | vdev, |
1636 | hdev->vqs + i, | |
1637 | hdev->vq_index + i); | |
d5970055 | 1638 | } |
54dd9321 | 1639 | |
c471ad0e JW |
1640 | if (vhost_dev_has_iommu(hdev)) { |
1641 | hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false); | |
375f74f4 | 1642 | memory_listener_unregister(&hdev->iommu_listener); |
c471ad0e | 1643 | } |
309750fa | 1644 | vhost_log_put(hdev, true); |
d5970055 | 1645 | hdev->started = false; |
c471ad0e | 1646 | hdev->vdev = NULL; |
d5970055 | 1647 | } |
950d94ba MAL |
1648 | |
1649 | int vhost_net_set_backend(struct vhost_dev *hdev, | |
1650 | struct vhost_vring_file *file) | |
1651 | { | |
1652 | if (hdev->vhost_ops->vhost_net_set_backend) { | |
1653 | return hdev->vhost_ops->vhost_net_set_backend(hdev, file); | |
1654 | } | |
1655 | ||
1656 | return -1; | |
1657 | } |