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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" |
aa3c40f6 | 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 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) |
160 | { | |
161 | uint64_t log_size = 0; | |
162 | int i; | |
163 | for (i = 0; i < dev->mem->nregions; ++i) { | |
164 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
165 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
166 | reg->memory_size); | |
167 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
168 | } | |
169 | for (i = 0; i < dev->nvqs; ++i) { | |
170 | struct vhost_virtqueue *vq = dev->vqs + i; | |
171 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
172 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
173 | } | |
174 | return log_size; | |
175 | } | |
15324404 MAL |
176 | |
177 | static struct vhost_log *vhost_log_alloc(uint64_t size, bool share) | |
309750fa | 178 | { |
0f2956f9 | 179 | Error *err = NULL; |
15324404 MAL |
180 | struct vhost_log *log; |
181 | uint64_t logsize = size * sizeof(*(log->log)); | |
182 | int fd = -1; | |
183 | ||
184 | log = g_new0(struct vhost_log, 1); | |
185 | if (share) { | |
186 | log->log = qemu_memfd_alloc("vhost-log", logsize, | |
187 | F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, | |
0f2956f9 MAL |
188 | &fd, &err); |
189 | if (err) { | |
190 | error_report_err(err); | |
191 | g_free(log); | |
192 | return NULL; | |
193 | } | |
15324404 MAL |
194 | memset(log->log, 0, logsize); |
195 | } else { | |
196 | log->log = g_malloc0(logsize); | |
197 | } | |
309750fa JW |
198 | |
199 | log->size = size; | |
200 | log->refcnt = 1; | |
15324404 | 201 | log->fd = fd; |
309750fa JW |
202 | |
203 | return log; | |
204 | } | |
205 | ||
15324404 | 206 | static struct vhost_log *vhost_log_get(uint64_t size, bool share) |
309750fa | 207 | { |
15324404 MAL |
208 | struct vhost_log *log = share ? vhost_log_shm : vhost_log; |
209 | ||
210 | if (!log || log->size != size) { | |
211 | log = vhost_log_alloc(size, share); | |
212 | if (share) { | |
213 | vhost_log_shm = log; | |
214 | } else { | |
215 | vhost_log = log; | |
216 | } | |
309750fa | 217 | } else { |
15324404 | 218 | ++log->refcnt; |
309750fa JW |
219 | } |
220 | ||
15324404 | 221 | return log; |
309750fa JW |
222 | } |
223 | ||
224 | static void vhost_log_put(struct vhost_dev *dev, bool sync) | |
225 | { | |
226 | struct vhost_log *log = dev->log; | |
227 | ||
228 | if (!log) { | |
229 | return; | |
230 | } | |
231 | ||
232 | --log->refcnt; | |
233 | if (log->refcnt == 0) { | |
234 | /* Sync only the range covered by the old log */ | |
235 | if (dev->log_size && sync) { | |
236 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
237 | } | |
15324404 | 238 | |
309750fa | 239 | if (vhost_log == log) { |
15324404 | 240 | g_free(log->log); |
309750fa | 241 | vhost_log = NULL; |
15324404 MAL |
242 | } else if (vhost_log_shm == log) { |
243 | qemu_memfd_free(log->log, log->size * sizeof(*(log->log)), | |
244 | log->fd); | |
245 | vhost_log_shm = NULL; | |
309750fa | 246 | } |
15324404 | 247 | |
309750fa JW |
248 | g_free(log); |
249 | } | |
5c0ba1be FF |
250 | |
251 | dev->log = NULL; | |
252 | dev->log_size = 0; | |
309750fa | 253 | } |
d5970055 | 254 | |
15324404 MAL |
255 | static bool vhost_dev_log_is_shared(struct vhost_dev *dev) |
256 | { | |
257 | return dev->vhost_ops->vhost_requires_shm_log && | |
258 | dev->vhost_ops->vhost_requires_shm_log(dev); | |
259 | } | |
260 | ||
261 | static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t size) | |
d5970055 | 262 | { |
15324404 | 263 | struct vhost_log *log = vhost_log_get(size, vhost_dev_log_is_shared(dev)); |
309750fa | 264 | uint64_t log_base = (uintptr_t)log->log; |
6b37a23d | 265 | int r; |
6528499f | 266 | |
636f4ddd MAL |
267 | /* inform backend of log switching, this must be done before |
268 | releasing the current log, to ensure no logging is lost */ | |
9a78a5dd | 269 | r = dev->vhost_ops->vhost_set_log_base(dev, log_base, log); |
162bba7f MAL |
270 | if (r < 0) { |
271 | VHOST_OPS_DEBUG("vhost_set_log_base failed"); | |
272 | } | |
273 | ||
309750fa | 274 | vhost_log_put(dev, true); |
d5970055 MT |
275 | dev->log = log; |
276 | dev->log_size = size; | |
277 | } | |
278 | ||
c471ad0e JW |
279 | static int vhost_dev_has_iommu(struct vhost_dev *dev) |
280 | { | |
281 | VirtIODevice *vdev = dev->vdev; | |
c471ad0e | 282 | |
375f74f4 | 283 | return virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); |
c471ad0e JW |
284 | } |
285 | ||
286 | static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr, | |
287 | hwaddr *plen, int is_write) | |
288 | { | |
289 | if (!vhost_dev_has_iommu(dev)) { | |
290 | return cpu_physical_memory_map(addr, plen, is_write); | |
291 | } else { | |
292 | return (void *)(uintptr_t)addr; | |
293 | } | |
294 | } | |
295 | ||
296 | static void vhost_memory_unmap(struct vhost_dev *dev, void *buffer, | |
297 | hwaddr len, int is_write, | |
298 | hwaddr access_len) | |
299 | { | |
300 | if (!vhost_dev_has_iommu(dev)) { | |
301 | cpu_physical_memory_unmap(buffer, len, is_write, access_len); | |
302 | } | |
303 | } | |
f1f9e6c5 | 304 | |
0ca1fd2d DDAG |
305 | static int vhost_verify_ring_part_mapping(void *ring_hva, |
306 | uint64_t ring_gpa, | |
307 | uint64_t ring_size, | |
308 | void *reg_hva, | |
309 | uint64_t reg_gpa, | |
310 | uint64_t reg_size) | |
f1f9e6c5 | 311 | { |
0ca1fd2d DDAG |
312 | uint64_t hva_ring_offset; |
313 | uint64_t ring_last = range_get_last(ring_gpa, ring_size); | |
314 | uint64_t reg_last = range_get_last(reg_gpa, reg_size); | |
f1f9e6c5 | 315 | |
0ca1fd2d | 316 | if (ring_last < reg_gpa || ring_gpa > reg_last) { |
f1f9e6c5 GK |
317 | return 0; |
318 | } | |
0ca1fd2d DDAG |
319 | /* check that whole ring's is mapped */ |
320 | if (ring_last > reg_last) { | |
321 | return -ENOMEM; | |
f1f9e6c5 | 322 | } |
0ca1fd2d DDAG |
323 | /* check that ring's MemoryRegion wasn't replaced */ |
324 | hva_ring_offset = ring_gpa - reg_gpa; | |
325 | if (ring_hva != reg_hva + hva_ring_offset) { | |
326 | return -EBUSY; | |
f1f9e6c5 | 327 | } |
0ca1fd2d DDAG |
328 | |
329 | return 0; | |
f1f9e6c5 GK |
330 | } |
331 | ||
d5970055 | 332 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, |
0ca1fd2d DDAG |
333 | void *reg_hva, |
334 | uint64_t reg_gpa, | |
335 | uint64_t reg_size) | |
d5970055 | 336 | { |
f1f9e6c5 | 337 | int i, j; |
8617343f | 338 | int r = 0; |
f1f9e6c5 GK |
339 | const char *part_name[] = { |
340 | "descriptor table", | |
341 | "available ring", | |
342 | "used ring" | |
343 | }; | |
8617343f | 344 | |
f1f9e6c5 | 345 | for (i = 0; i < dev->nvqs; ++i) { |
d5970055 | 346 | struct vhost_virtqueue *vq = dev->vqs + i; |
d5970055 | 347 | |
fb20fbb7 JH |
348 | if (vq->desc_phys == 0) { |
349 | continue; | |
350 | } | |
351 | ||
f1f9e6c5 | 352 | j = 0; |
0ca1fd2d DDAG |
353 | r = vhost_verify_ring_part_mapping( |
354 | vq->desc, vq->desc_phys, vq->desc_size, | |
355 | reg_hva, reg_gpa, reg_size); | |
2fe45ec3 | 356 | if (r) { |
f1f9e6c5 | 357 | break; |
d5970055 | 358 | } |
f1f9e6c5 GK |
359 | |
360 | j++; | |
0ca1fd2d | 361 | r = vhost_verify_ring_part_mapping( |
9fac50c8 | 362 | vq->avail, vq->avail_phys, vq->avail_size, |
0ca1fd2d | 363 | reg_hva, reg_gpa, reg_size); |
2fe45ec3 | 364 | if (r) { |
f1f9e6c5 | 365 | break; |
d5970055 | 366 | } |
f1f9e6c5 GK |
367 | |
368 | j++; | |
0ca1fd2d | 369 | r = vhost_verify_ring_part_mapping( |
9fac50c8 | 370 | vq->used, vq->used_phys, vq->used_size, |
0ca1fd2d | 371 | reg_hva, reg_gpa, reg_size); |
2fe45ec3 | 372 | if (r) { |
f1f9e6c5 | 373 | break; |
d5970055 | 374 | } |
f1f9e6c5 GK |
375 | } |
376 | ||
377 | if (r == -ENOMEM) { | |
378 | error_report("Unable to map %s for ring %d", part_name[j], i); | |
379 | } else if (r == -EBUSY) { | |
380 | error_report("%s relocated for ring %d", part_name[j], i); | |
d5970055 | 381 | } |
8617343f | 382 | return r; |
d5970055 MT |
383 | } |
384 | ||
af603142 NB |
385 | static bool vhost_section(MemoryRegionSection *section) |
386 | { | |
aa3c40f6 DDAG |
387 | bool result; |
388 | bool log_dirty = memory_region_get_dirty_log_mask(section->mr) & | |
389 | ~(1 << DIRTY_MEMORY_MIGRATION); | |
390 | result = memory_region_is_ram(section->mr) && | |
d56ec1e9 | 391 | !memory_region_is_rom(section->mr); |
aa3c40f6 DDAG |
392 | |
393 | /* Vhost doesn't handle any block which is doing dirty-tracking other | |
394 | * than migration; this typically fires on VGA areas. | |
395 | */ | |
396 | result &= !log_dirty; | |
397 | ||
398 | trace_vhost_section(section->mr->name, result); | |
399 | return result; | |
af603142 NB |
400 | } |
401 | ||
402 | static void vhost_begin(MemoryListener *listener) | |
403 | { | |
404 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
405 | memory_listener); | |
c44317ef DDAG |
406 | dev->tmp_sections = NULL; |
407 | dev->n_tmp_sections = 0; | |
af603142 | 408 | } |
d5970055 | 409 | |
af603142 NB |
410 | static void vhost_commit(MemoryListener *listener) |
411 | { | |
412 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
413 | memory_listener); | |
c44317ef DDAG |
414 | MemoryRegionSection *old_sections; |
415 | int n_old_sections; | |
af603142 | 416 | uint64_t log_size; |
ade6d081 | 417 | size_t regions_size; |
af603142 | 418 | int r; |
0ca1fd2d | 419 | int i; |
ade6d081 | 420 | bool changed = false; |
af603142 | 421 | |
ade6d081 DDAG |
422 | /* Note we can be called before the device is started, but then |
423 | * starting the device calls set_mem_table, so we need to have | |
424 | * built the data structures. | |
425 | */ | |
c44317ef DDAG |
426 | old_sections = dev->mem_sections; |
427 | n_old_sections = dev->n_mem_sections; | |
428 | dev->mem_sections = dev->tmp_sections; | |
429 | dev->n_mem_sections = dev->n_tmp_sections; | |
430 | ||
ade6d081 DDAG |
431 | if (dev->n_mem_sections != n_old_sections) { |
432 | changed = true; | |
433 | } else { | |
434 | /* Same size, lets check the contents */ | |
435 | changed = n_old_sections && memcmp(dev->mem_sections, old_sections, | |
436 | n_old_sections * sizeof(old_sections[0])) != 0; | |
af603142 | 437 | } |
ade6d081 DDAG |
438 | |
439 | trace_vhost_commit(dev->started, changed); | |
440 | if (!changed) { | |
c44317ef | 441 | goto out; |
d5970055 | 442 | } |
ade6d081 DDAG |
443 | |
444 | /* Rebuild the regions list from the new sections list */ | |
445 | regions_size = offsetof(struct vhost_memory, regions) + | |
446 | dev->n_mem_sections * sizeof dev->mem->regions[0]; | |
447 | dev->mem = g_realloc(dev->mem, regions_size); | |
448 | dev->mem->nregions = dev->n_mem_sections; | |
449 | used_memslots = dev->mem->nregions; | |
450 | for (i = 0; i < dev->n_mem_sections; i++) { | |
451 | struct vhost_memory_region *cur_vmr = dev->mem->regions + i; | |
452 | struct MemoryRegionSection *mrs = dev->mem_sections + i; | |
453 | ||
454 | cur_vmr->guest_phys_addr = mrs->offset_within_address_space; | |
455 | cur_vmr->memory_size = int128_get64(mrs->size); | |
456 | cur_vmr->userspace_addr = | |
457 | (uintptr_t)memory_region_get_ram_ptr(mrs->mr) + | |
458 | mrs->offset_within_region; | |
459 | cur_vmr->flags_padding = 0; | |
460 | } | |
461 | ||
462 | if (!dev->started) { | |
c44317ef | 463 | goto out; |
af603142 | 464 | } |
d5970055 | 465 | |
0ca1fd2d DDAG |
466 | for (i = 0; i < dev->mem->nregions; i++) { |
467 | if (vhost_verify_ring_mappings(dev, | |
468 | (void *)(uintptr_t)dev->mem->regions[i].userspace_addr, | |
469 | dev->mem->regions[i].guest_phys_addr, | |
470 | dev->mem->regions[i].memory_size)) { | |
471 | error_report("Verify ring failure on region %d", i); | |
472 | abort(); | |
473 | } | |
d5970055 MT |
474 | } |
475 | ||
476 | if (!dev->log_enabled) { | |
21e70425 | 477 | r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
162bba7f MAL |
478 | if (r < 0) { |
479 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); | |
480 | } | |
c44317ef | 481 | goto out; |
d5970055 MT |
482 | } |
483 | log_size = vhost_get_log_size(dev); | |
484 | /* We allocate an extra 4K bytes to log, | |
485 | * to reduce the * number of reallocations. */ | |
486 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
487 | /* To log more, must increase log size before table update. */ | |
488 | if (dev->log_size < log_size) { | |
489 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
490 | } | |
21e70425 | 491 | r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
162bba7f MAL |
492 | if (r < 0) { |
493 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); | |
494 | } | |
d5970055 MT |
495 | /* To log less, can only decrease log size after table update. */ |
496 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
497 | vhost_dev_log_resize(dev, log_size); | |
498 | } | |
c44317ef DDAG |
499 | |
500 | out: | |
501 | /* Deref the old list of sections, this must happen _after_ the | |
502 | * vhost_set_mem_table to ensure the client isn't still using the | |
503 | * section we're about to unref. | |
504 | */ | |
505 | while (n_old_sections--) { | |
506 | memory_region_unref(old_sections[n_old_sections].mr); | |
507 | } | |
508 | g_free(old_sections); | |
509 | return; | |
510 | } | |
511 | ||
48d7c975 DDAG |
512 | /* Adds the section data to the tmp_section structure. |
513 | * It relies on the listener calling us in memory address order | |
514 | * and for each region (via the _add and _nop methods) to | |
515 | * join neighbours. | |
516 | */ | |
517 | static void vhost_region_add_section(struct vhost_dev *dev, | |
518 | MemoryRegionSection *section) | |
c44317ef | 519 | { |
48d7c975 DDAG |
520 | bool need_add = true; |
521 | uint64_t mrs_size = int128_get64(section->size); | |
522 | uint64_t mrs_gpa = section->offset_within_address_space; | |
523 | uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) + | |
524 | section->offset_within_region; | |
525 | ||
526 | trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size, | |
527 | mrs_host); | |
528 | ||
48d7c975 DDAG |
529 | if (dev->n_tmp_sections) { |
530 | /* Since we already have at least one section, lets see if | |
531 | * this extends it; since we're scanning in order, we only | |
532 | * have to look at the last one, and the FlatView that calls | |
533 | * us shouldn't have overlaps. | |
534 | */ | |
535 | MemoryRegionSection *prev_sec = dev->tmp_sections + | |
536 | (dev->n_tmp_sections - 1); | |
537 | uint64_t prev_gpa_start = prev_sec->offset_within_address_space; | |
538 | uint64_t prev_size = int128_get64(prev_sec->size); | |
539 | uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size); | |
540 | uint64_t prev_host_start = | |
541 | (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) + | |
542 | prev_sec->offset_within_region; | |
543 | uint64_t prev_host_end = range_get_last(prev_host_start, prev_size); | |
544 | ||
545 | if (prev_gpa_end + 1 == mrs_gpa && | |
546 | prev_host_end + 1 == mrs_host && | |
547 | section->mr == prev_sec->mr && | |
548 | (!dev->vhost_ops->vhost_backend_can_merge || | |
549 | dev->vhost_ops->vhost_backend_can_merge(dev, | |
550 | mrs_host, mrs_size, | |
551 | prev_host_start, prev_size))) { | |
552 | /* The two sections abut */ | |
553 | need_add = false; | |
554 | prev_sec->size = int128_add(prev_sec->size, section->size); | |
555 | trace_vhost_region_add_section_abut(section->mr->name, | |
556 | mrs_size + prev_size); | |
557 | } | |
558 | } | |
559 | ||
560 | if (need_add) { | |
561 | ++dev->n_tmp_sections; | |
562 | dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections, | |
563 | dev->n_tmp_sections); | |
564 | dev->tmp_sections[dev->n_tmp_sections - 1] = *section; | |
565 | /* The flatview isn't stable and we don't use it, making it NULL | |
566 | * means we can memcmp the list. | |
567 | */ | |
568 | dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL; | |
569 | memory_region_ref(section->mr); | |
570 | } | |
50c1e149 AK |
571 | } |
572 | ||
938eeb64 DDAG |
573 | /* Used for both add and nop callbacks */ |
574 | static void vhost_region_addnop(MemoryListener *listener, | |
575 | MemoryRegionSection *section) | |
04097f7c | 576 | { |
2817b260 AK |
577 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
578 | memory_listener); | |
579 | ||
c49450b9 AK |
580 | if (!vhost_section(section)) { |
581 | return; | |
582 | } | |
48d7c975 | 583 | vhost_region_add_section(dev, section); |
04097f7c AK |
584 | } |
585 | ||
375f74f4 JW |
586 | static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) |
587 | { | |
588 | struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n); | |
589 | struct vhost_dev *hdev = iommu->hdev; | |
590 | hwaddr iova = iotlb->iova + iommu->iommu_offset; | |
591 | ||
020e571b MC |
592 | if (vhost_backend_invalidate_device_iotlb(hdev, iova, |
593 | iotlb->addr_mask + 1)) { | |
375f74f4 JW |
594 | error_report("Fail to invalidate device iotlb"); |
595 | } | |
596 | } | |
597 | ||
598 | static void vhost_iommu_region_add(MemoryListener *listener, | |
599 | MemoryRegionSection *section) | |
600 | { | |
601 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
602 | iommu_listener); | |
603 | struct vhost_iommu *iommu; | |
698feb5e | 604 | Int128 end; |
375f74f4 JW |
605 | |
606 | if (!memory_region_is_iommu(section->mr)) { | |
607 | return; | |
608 | } | |
609 | ||
610 | iommu = g_malloc0(sizeof(*iommu)); | |
698feb5e PX |
611 | end = int128_add(int128_make64(section->offset_within_region), |
612 | section->size); | |
613 | end = int128_sub(end, int128_one()); | |
614 | iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify, | |
615 | IOMMU_NOTIFIER_UNMAP, | |
616 | section->offset_within_region, | |
617 | int128_get64(end)); | |
375f74f4 JW |
618 | iommu->mr = section->mr; |
619 | iommu->iommu_offset = section->offset_within_address_space - | |
620 | section->offset_within_region; | |
621 | iommu->hdev = dev; | |
622 | memory_region_register_iommu_notifier(section->mr, &iommu->n); | |
623 | QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next); | |
624 | /* TODO: can replay help performance here? */ | |
625 | } | |
626 | ||
627 | static void vhost_iommu_region_del(MemoryListener *listener, | |
628 | MemoryRegionSection *section) | |
629 | { | |
630 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
631 | iommu_listener); | |
632 | struct vhost_iommu *iommu; | |
633 | ||
634 | if (!memory_region_is_iommu(section->mr)) { | |
635 | return; | |
636 | } | |
637 | ||
638 | QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) { | |
698feb5e PX |
639 | if (iommu->mr == section->mr && |
640 | iommu->n.start == section->offset_within_region) { | |
375f74f4 JW |
641 | memory_region_unregister_iommu_notifier(iommu->mr, |
642 | &iommu->n); | |
643 | QLIST_REMOVE(iommu, iommu_next); | |
644 | g_free(iommu); | |
645 | break; | |
646 | } | |
647 | } | |
648 | } | |
649 | ||
d5970055 MT |
650 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
651 | struct vhost_virtqueue *vq, | |
652 | unsigned idx, bool enable_log) | |
653 | { | |
654 | struct vhost_vring_addr addr = { | |
655 | .index = idx, | |
2b3af999 SW |
656 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
657 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
658 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
659 | .log_guest_addr = vq->used_phys, |
660 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
661 | }; | |
21e70425 | 662 | int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr); |
d5970055 | 663 | if (r < 0) { |
c6409692 | 664 | VHOST_OPS_DEBUG("vhost_set_vring_addr failed"); |
d5970055 MT |
665 | return -errno; |
666 | } | |
667 | return 0; | |
668 | } | |
669 | ||
c471ad0e JW |
670 | static int vhost_dev_set_features(struct vhost_dev *dev, |
671 | bool enable_log) | |
d5970055 MT |
672 | { |
673 | uint64_t features = dev->acked_features; | |
674 | int r; | |
675 | if (enable_log) { | |
9a2ba823 | 676 | features |= 0x1ULL << VHOST_F_LOG_ALL; |
d5970055 | 677 | } |
21e70425 | 678 | r = dev->vhost_ops->vhost_set_features(dev, features); |
c6409692 MAL |
679 | if (r < 0) { |
680 | VHOST_OPS_DEBUG("vhost_set_features failed"); | |
681 | } | |
d5970055 MT |
682 | return r < 0 ? -errno : 0; |
683 | } | |
684 | ||
685 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
686 | { | |
162bba7f | 687 | int r, i, idx; |
d5970055 MT |
688 | r = vhost_dev_set_features(dev, enable_log); |
689 | if (r < 0) { | |
690 | goto err_features; | |
691 | } | |
692 | for (i = 0; i < dev->nvqs; ++i) { | |
25a2a920 TC |
693 | idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
694 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, | |
d5970055 MT |
695 | enable_log); |
696 | if (r < 0) { | |
697 | goto err_vq; | |
698 | } | |
699 | } | |
700 | return 0; | |
701 | err_vq: | |
702 | for (; i >= 0; --i) { | |
25a2a920 | 703 | idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
162bba7f MAL |
704 | vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, |
705 | dev->log_enabled); | |
d5970055 | 706 | } |
162bba7f | 707 | vhost_dev_set_features(dev, dev->log_enabled); |
d5970055 MT |
708 | err_features: |
709 | return r; | |
710 | } | |
711 | ||
04097f7c | 712 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 713 | { |
04097f7c AK |
714 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
715 | memory_listener); | |
d5970055 MT |
716 | int r; |
717 | if (!!enable == dev->log_enabled) { | |
718 | return 0; | |
719 | } | |
720 | if (!dev->started) { | |
721 | dev->log_enabled = enable; | |
722 | return 0; | |
723 | } | |
724 | if (!enable) { | |
725 | r = vhost_dev_set_log(dev, false); | |
726 | if (r < 0) { | |
727 | return r; | |
728 | } | |
309750fa | 729 | vhost_log_put(dev, false); |
d5970055 MT |
730 | } else { |
731 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
732 | r = vhost_dev_set_log(dev, true); | |
733 | if (r < 0) { | |
734 | return r; | |
735 | } | |
736 | } | |
737 | dev->log_enabled = enable; | |
738 | return 0; | |
739 | } | |
740 | ||
04097f7c AK |
741 | static void vhost_log_global_start(MemoryListener *listener) |
742 | { | |
743 | int r; | |
744 | ||
745 | r = vhost_migration_log(listener, true); | |
746 | if (r < 0) { | |
747 | abort(); | |
748 | } | |
749 | } | |
750 | ||
751 | static void vhost_log_global_stop(MemoryListener *listener) | |
752 | { | |
753 | int r; | |
754 | ||
755 | r = vhost_migration_log(listener, false); | |
756 | if (r < 0) { | |
757 | abort(); | |
758 | } | |
759 | } | |
760 | ||
761 | static void vhost_log_start(MemoryListener *listener, | |
b2dfd71c PB |
762 | MemoryRegionSection *section, |
763 | int old, int new) | |
04097f7c AK |
764 | { |
765 | /* FIXME: implement */ | |
766 | } | |
767 | ||
768 | static void vhost_log_stop(MemoryListener *listener, | |
b2dfd71c PB |
769 | MemoryRegionSection *section, |
770 | int old, int new) | |
04097f7c AK |
771 | { |
772 | /* FIXME: implement */ | |
773 | } | |
774 | ||
46f70ff1 GK |
775 | /* The vhost driver natively knows how to handle the vrings of non |
776 | * cross-endian legacy devices and modern devices. Only legacy devices | |
777 | * exposed to a bi-endian guest may require the vhost driver to use a | |
778 | * specific endianness. | |
779 | */ | |
a122ab24 GK |
780 | static inline bool vhost_needs_vring_endian(VirtIODevice *vdev) |
781 | { | |
e5848123 GK |
782 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
783 | return false; | |
784 | } | |
a122ab24 | 785 | #ifdef HOST_WORDS_BIGENDIAN |
46f70ff1 | 786 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE; |
a122ab24 | 787 | #else |
46f70ff1 | 788 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; |
a122ab24 | 789 | #endif |
a122ab24 GK |
790 | } |
791 | ||
04b7a152 GK |
792 | static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, |
793 | bool is_big_endian, | |
794 | int vhost_vq_index) | |
795 | { | |
796 | struct vhost_vring_state s = { | |
797 | .index = vhost_vq_index, | |
798 | .num = is_big_endian | |
799 | }; | |
800 | ||
21e70425 | 801 | if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) { |
04b7a152 GK |
802 | return 0; |
803 | } | |
804 | ||
c6409692 | 805 | VHOST_OPS_DEBUG("vhost_set_vring_endian failed"); |
04b7a152 GK |
806 | if (errno == ENOTTY) { |
807 | error_report("vhost does not support cross-endian"); | |
808 | return -ENOSYS; | |
809 | } | |
810 | ||
811 | return -errno; | |
812 | } | |
813 | ||
c471ad0e JW |
814 | static int vhost_memory_region_lookup(struct vhost_dev *hdev, |
815 | uint64_t gpa, uint64_t *uaddr, | |
816 | uint64_t *len) | |
817 | { | |
818 | int i; | |
819 | ||
820 | for (i = 0; i < hdev->mem->nregions; i++) { | |
821 | struct vhost_memory_region *reg = hdev->mem->regions + i; | |
822 | ||
823 | if (gpa >= reg->guest_phys_addr && | |
824 | reg->guest_phys_addr + reg->memory_size > gpa) { | |
825 | *uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr; | |
826 | *len = reg->guest_phys_addr + reg->memory_size - gpa; | |
827 | return 0; | |
828 | } | |
829 | } | |
830 | ||
831 | return -EFAULT; | |
832 | } | |
833 | ||
fc58bd0d | 834 | int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write) |
c471ad0e JW |
835 | { |
836 | IOMMUTLBEntry iotlb; | |
837 | uint64_t uaddr, len; | |
fc58bd0d | 838 | int ret = -EFAULT; |
c471ad0e JW |
839 | |
840 | rcu_read_lock(); | |
841 | ||
842 | iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as, | |
843 | iova, write); | |
844 | if (iotlb.target_as != NULL) { | |
fc58bd0d MC |
845 | ret = vhost_memory_region_lookup(dev, iotlb.translated_addr, |
846 | &uaddr, &len); | |
847 | if (ret) { | |
c471ad0e JW |
848 | error_report("Fail to lookup the translated address " |
849 | "%"PRIx64, iotlb.translated_addr); | |
850 | goto out; | |
851 | } | |
852 | ||
853 | len = MIN(iotlb.addr_mask + 1, len); | |
854 | iova = iova & ~iotlb.addr_mask; | |
855 | ||
020e571b MC |
856 | ret = vhost_backend_update_device_iotlb(dev, iova, uaddr, |
857 | len, iotlb.perm); | |
fc58bd0d | 858 | if (ret) { |
c471ad0e JW |
859 | error_report("Fail to update device iotlb"); |
860 | goto out; | |
861 | } | |
862 | } | |
863 | out: | |
864 | rcu_read_unlock(); | |
fc58bd0d MC |
865 | |
866 | return ret; | |
c471ad0e JW |
867 | } |
868 | ||
f56a1247 | 869 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
870 | struct VirtIODevice *vdev, |
871 | struct vhost_virtqueue *vq, | |
872 | unsigned idx) | |
873 | { | |
96a3d98d JW |
874 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
875 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
876 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
a8170e5e | 877 | hwaddr s, l, a; |
d5970055 | 878 | int r; |
21e70425 | 879 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
d5970055 | 880 | struct vhost_vring_file file = { |
a9f98bb5 | 881 | .index = vhost_vq_index |
d5970055 MT |
882 | }; |
883 | struct vhost_vring_state state = { | |
a9f98bb5 | 884 | .index = vhost_vq_index |
d5970055 MT |
885 | }; |
886 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
887 | ||
fb20fbb7 JH |
888 | a = virtio_queue_get_desc_addr(vdev, idx); |
889 | if (a == 0) { | |
890 | /* Queue might not be ready for start */ | |
891 | return 0; | |
892 | } | |
a9f98bb5 | 893 | |
d5970055 | 894 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
21e70425 | 895 | r = dev->vhost_ops->vhost_set_vring_num(dev, &state); |
d5970055 | 896 | if (r) { |
c6409692 | 897 | VHOST_OPS_DEBUG("vhost_set_vring_num failed"); |
d5970055 MT |
898 | return -errno; |
899 | } | |
900 | ||
901 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
21e70425 | 902 | r = dev->vhost_ops->vhost_set_vring_base(dev, &state); |
d5970055 | 903 | if (r) { |
c6409692 | 904 | VHOST_OPS_DEBUG("vhost_set_vring_base failed"); |
d5970055 MT |
905 | return -errno; |
906 | } | |
907 | ||
e5848123 | 908 | if (vhost_needs_vring_endian(vdev)) { |
04b7a152 GK |
909 | r = vhost_virtqueue_set_vring_endian_legacy(dev, |
910 | virtio_is_big_endian(vdev), | |
911 | vhost_vq_index); | |
912 | if (r) { | |
913 | return -errno; | |
914 | } | |
915 | } | |
916 | ||
f1f9e6c5 | 917 | vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx); |
fb20fbb7 | 918 | vq->desc_phys = a; |
c471ad0e | 919 | vq->desc = vhost_memory_map(dev, a, &l, 0); |
d5970055 MT |
920 | if (!vq->desc || l != s) { |
921 | r = -ENOMEM; | |
922 | goto fail_alloc_desc; | |
923 | } | |
f1f9e6c5 GK |
924 | vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx); |
925 | vq->avail_phys = a = virtio_queue_get_avail_addr(vdev, idx); | |
c471ad0e | 926 | vq->avail = vhost_memory_map(dev, a, &l, 0); |
d5970055 MT |
927 | if (!vq->avail || l != s) { |
928 | r = -ENOMEM; | |
929 | goto fail_alloc_avail; | |
930 | } | |
931 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
932 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
c471ad0e | 933 | vq->used = vhost_memory_map(dev, a, &l, 1); |
d5970055 MT |
934 | if (!vq->used || l != s) { |
935 | r = -ENOMEM; | |
936 | goto fail_alloc_used; | |
937 | } | |
938 | ||
a9f98bb5 | 939 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
940 | if (r < 0) { |
941 | r = -errno; | |
942 | goto fail_alloc; | |
943 | } | |
a9f98bb5 | 944 | |
d5970055 | 945 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
21e70425 | 946 | r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); |
d5970055 | 947 | if (r) { |
c6409692 | 948 | VHOST_OPS_DEBUG("vhost_set_vring_kick failed"); |
c8852121 | 949 | r = -errno; |
d5970055 MT |
950 | goto fail_kick; |
951 | } | |
952 | ||
f56a1247 MT |
953 | /* Clear and discard previous events if any. */ |
954 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 | 955 | |
5669655a VK |
956 | /* Init vring in unmasked state, unless guest_notifier_mask |
957 | * will do it later. | |
958 | */ | |
959 | if (!vdev->use_guest_notifier_mask) { | |
960 | /* TODO: check and handle errors. */ | |
961 | vhost_virtqueue_mask(dev, vdev, idx, false); | |
962 | } | |
963 | ||
96a3d98d JW |
964 | if (k->query_guest_notifiers && |
965 | k->query_guest_notifiers(qbus->parent) && | |
966 | virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) { | |
967 | file.fd = -1; | |
968 | r = dev->vhost_ops->vhost_set_vring_call(dev, &file); | |
969 | if (r) { | |
970 | goto fail_vector; | |
971 | } | |
972 | } | |
973 | ||
d5970055 MT |
974 | return 0; |
975 | ||
96a3d98d | 976 | fail_vector: |
d5970055 | 977 | fail_kick: |
d5970055 | 978 | fail_alloc: |
c471ad0e JW |
979 | vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
980 | 0, 0); | |
d5970055 | 981 | fail_alloc_used: |
c471ad0e JW |
982 | vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), |
983 | 0, 0); | |
d5970055 | 984 | fail_alloc_avail: |
c471ad0e JW |
985 | vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), |
986 | 0, 0); | |
d5970055 MT |
987 | fail_alloc_desc: |
988 | return r; | |
989 | } | |
990 | ||
f56a1247 | 991 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
992 | struct VirtIODevice *vdev, |
993 | struct vhost_virtqueue *vq, | |
994 | unsigned idx) | |
995 | { | |
21e70425 | 996 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
d5970055 | 997 | struct vhost_vring_state state = { |
04b7a152 | 998 | .index = vhost_vq_index, |
d5970055 MT |
999 | }; |
1000 | int r; | |
fb20fbb7 JH |
1001 | int a; |
1002 | ||
1003 | a = virtio_queue_get_desc_addr(vdev, idx); | |
1004 | if (a == 0) { | |
1005 | /* Don't stop the virtqueue which might have not been started */ | |
1006 | return; | |
1007 | } | |
fc57fd99 | 1008 | |
21e70425 | 1009 | r = dev->vhost_ops->vhost_get_vring_base(dev, &state); |
d5970055 | 1010 | if (r < 0) { |
c6409692 | 1011 | VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r); |
2ae39a11 MC |
1012 | /* Connection to the backend is broken, so let's sync internal |
1013 | * last avail idx to the device used idx. | |
1014 | */ | |
1015 | virtio_queue_restore_last_avail_idx(vdev, idx); | |
499c5579 MAL |
1016 | } else { |
1017 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
d5970055 | 1018 | } |
3561ba14 | 1019 | virtio_queue_invalidate_signalled_used(vdev, idx); |
aa94d521 | 1020 | virtio_queue_update_used_idx(vdev, idx); |
04b7a152 GK |
1021 | |
1022 | /* In the cross-endian case, we need to reset the vring endianness to | |
1023 | * native as legacy devices expect so by default. | |
1024 | */ | |
e5848123 | 1025 | if (vhost_needs_vring_endian(vdev)) { |
162bba7f MAL |
1026 | vhost_virtqueue_set_vring_endian_legacy(dev, |
1027 | !virtio_is_big_endian(vdev), | |
1028 | vhost_vq_index); | |
04b7a152 GK |
1029 | } |
1030 | ||
c471ad0e JW |
1031 | vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
1032 | 1, virtio_queue_get_used_size(vdev, idx)); | |
1033 | vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
1034 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
1035 | vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
1036 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
d5970055 MT |
1037 | } |
1038 | ||
80a1ea37 AK |
1039 | static void vhost_eventfd_add(MemoryListener *listener, |
1040 | MemoryRegionSection *section, | |
753d5e14 | 1041 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
1042 | { |
1043 | } | |
1044 | ||
1045 | static void vhost_eventfd_del(MemoryListener *listener, | |
1046 | MemoryRegionSection *section, | |
753d5e14 | 1047 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
1048 | { |
1049 | } | |
1050 | ||
69e87b32 JW |
1051 | static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev, |
1052 | int n, uint32_t timeout) | |
1053 | { | |
1054 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); | |
1055 | struct vhost_vring_state state = { | |
1056 | .index = vhost_vq_index, | |
1057 | .num = timeout, | |
1058 | }; | |
1059 | int r; | |
1060 | ||
1061 | if (!dev->vhost_ops->vhost_set_vring_busyloop_timeout) { | |
1062 | return -EINVAL; | |
1063 | } | |
1064 | ||
1065 | r = dev->vhost_ops->vhost_set_vring_busyloop_timeout(dev, &state); | |
1066 | if (r) { | |
c6409692 | 1067 | VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed"); |
69e87b32 JW |
1068 | return r; |
1069 | } | |
1070 | ||
1071 | return 0; | |
1072 | } | |
1073 | ||
f56a1247 MT |
1074 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
1075 | struct vhost_virtqueue *vq, int n) | |
1076 | { | |
21e70425 | 1077 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); |
f56a1247 | 1078 | struct vhost_vring_file file = { |
b931bfbf | 1079 | .index = vhost_vq_index, |
f56a1247 MT |
1080 | }; |
1081 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
1082 | if (r < 0) { | |
1083 | return r; | |
1084 | } | |
1085 | ||
1086 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
21e70425 | 1087 | r = dev->vhost_ops->vhost_set_vring_call(dev, &file); |
f56a1247 | 1088 | if (r) { |
c6409692 | 1089 | VHOST_OPS_DEBUG("vhost_set_vring_call failed"); |
f56a1247 MT |
1090 | r = -errno; |
1091 | goto fail_call; | |
1092 | } | |
c471ad0e JW |
1093 | |
1094 | vq->dev = dev; | |
1095 | ||
f56a1247 MT |
1096 | return 0; |
1097 | fail_call: | |
1098 | event_notifier_cleanup(&vq->masked_notifier); | |
1099 | return r; | |
1100 | } | |
1101 | ||
1102 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
1103 | { | |
1104 | event_notifier_cleanup(&vq->masked_notifier); | |
1105 | } | |
1106 | ||
81647a65 | 1107 | int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
69e87b32 | 1108 | VhostBackendType backend_type, uint32_t busyloop_timeout) |
d5970055 MT |
1109 | { |
1110 | uint64_t features; | |
a06db3ec | 1111 | int i, r, n_initialized_vqs = 0; |
fe44dc91 | 1112 | Error *local_err = NULL; |
81647a65 | 1113 | |
c471ad0e | 1114 | hdev->vdev = NULL; |
d2fc4402 MAL |
1115 | hdev->migration_blocker = NULL; |
1116 | ||
7cb8a9b9 MAL |
1117 | r = vhost_set_backend_type(hdev, backend_type); |
1118 | assert(r >= 0); | |
1a1bfac9 | 1119 | |
7cb8a9b9 MAL |
1120 | r = hdev->vhost_ops->vhost_backend_init(hdev, opaque); |
1121 | if (r < 0) { | |
1122 | goto fail; | |
24d1eb33 NN |
1123 | } |
1124 | ||
21e70425 | 1125 | r = hdev->vhost_ops->vhost_set_owner(hdev); |
d5970055 | 1126 | if (r < 0) { |
c6409692 | 1127 | VHOST_OPS_DEBUG("vhost_set_owner failed"); |
d5970055 MT |
1128 | goto fail; |
1129 | } | |
1130 | ||
21e70425 | 1131 | r = hdev->vhost_ops->vhost_get_features(hdev, &features); |
d5970055 | 1132 | if (r < 0) { |
c6409692 | 1133 | VHOST_OPS_DEBUG("vhost_get_features failed"); |
d5970055 MT |
1134 | goto fail; |
1135 | } | |
f56a1247 | 1136 | |
a06db3ec | 1137 | for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) { |
b931bfbf | 1138 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); |
f56a1247 | 1139 | if (r < 0) { |
a06db3ec | 1140 | goto fail; |
f56a1247 MT |
1141 | } |
1142 | } | |
69e87b32 JW |
1143 | |
1144 | if (busyloop_timeout) { | |
1145 | for (i = 0; i < hdev->nvqs; ++i) { | |
1146 | r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, | |
1147 | busyloop_timeout); | |
1148 | if (r < 0) { | |
1149 | goto fail_busyloop; | |
1150 | } | |
1151 | } | |
1152 | } | |
1153 | ||
d5970055 MT |
1154 | hdev->features = features; |
1155 | ||
04097f7c | 1156 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
1157 | .begin = vhost_begin, |
1158 | .commit = vhost_commit, | |
938eeb64 DDAG |
1159 | .region_add = vhost_region_addnop, |
1160 | .region_nop = vhost_region_addnop, | |
04097f7c AK |
1161 | .log_start = vhost_log_start, |
1162 | .log_stop = vhost_log_stop, | |
1163 | .log_sync = vhost_log_sync, | |
1164 | .log_global_start = vhost_log_global_start, | |
1165 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
1166 | .eventfd_add = vhost_eventfd_add, |
1167 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 1168 | .priority = 10 |
04097f7c | 1169 | }; |
d2fc4402 | 1170 | |
375f74f4 JW |
1171 | hdev->iommu_listener = (MemoryListener) { |
1172 | .region_add = vhost_iommu_region_add, | |
1173 | .region_del = vhost_iommu_region_del, | |
1174 | }; | |
c471ad0e | 1175 | |
d2fc4402 MAL |
1176 | if (hdev->migration_blocker == NULL) { |
1177 | if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { | |
1178 | error_setg(&hdev->migration_blocker, | |
1179 | "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); | |
0d34fbab | 1180 | } else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_check()) { |
31190ed7 MAL |
1181 | error_setg(&hdev->migration_blocker, |
1182 | "Migration disabled: failed to allocate shared memory"); | |
d2fc4402 MAL |
1183 | } |
1184 | } | |
1185 | ||
1186 | if (hdev->migration_blocker != NULL) { | |
fe44dc91 AA |
1187 | r = migrate_add_blocker(hdev->migration_blocker, &local_err); |
1188 | if (local_err) { | |
1189 | error_report_err(local_err); | |
1190 | error_free(hdev->migration_blocker); | |
1191 | goto fail_busyloop; | |
1192 | } | |
7145872e | 1193 | } |
d2fc4402 | 1194 | |
7267c094 | 1195 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
1196 | hdev->n_mem_sections = 0; |
1197 | hdev->mem_sections = NULL; | |
d5970055 MT |
1198 | hdev->log = NULL; |
1199 | hdev->log_size = 0; | |
1200 | hdev->log_enabled = false; | |
1201 | hdev->started = false; | |
f6790af6 | 1202 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
5be5f9be | 1203 | QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); |
9e2a2a3e JZ |
1204 | |
1205 | if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { | |
1206 | error_report("vhost backend memory slots limit is less" | |
1207 | " than current number of present memory slots"); | |
1208 | r = -1; | |
1209 | if (busyloop_timeout) { | |
1210 | goto fail_busyloop; | |
1211 | } else { | |
1212 | goto fail; | |
1213 | } | |
1214 | } | |
1215 | ||
d5970055 | 1216 | return 0; |
a06db3ec | 1217 | |
69e87b32 JW |
1218 | fail_busyloop: |
1219 | while (--i >= 0) { | |
1220 | vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0); | |
1221 | } | |
d5970055 | 1222 | fail: |
a06db3ec MAL |
1223 | hdev->nvqs = n_initialized_vqs; |
1224 | vhost_dev_cleanup(hdev); | |
d5970055 MT |
1225 | return r; |
1226 | } | |
1227 | ||
1228 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
1229 | { | |
f56a1247 | 1230 | int i; |
e0547b59 | 1231 | |
f56a1247 MT |
1232 | for (i = 0; i < hdev->nvqs; ++i) { |
1233 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
1234 | } | |
5be5f9be MAL |
1235 | if (hdev->mem) { |
1236 | /* those are only safe after successful init */ | |
1237 | memory_listener_unregister(&hdev->memory_listener); | |
1238 | QLIST_REMOVE(hdev, entry); | |
1239 | } | |
7145872e MT |
1240 | if (hdev->migration_blocker) { |
1241 | migrate_del_blocker(hdev->migration_blocker); | |
1242 | error_free(hdev->migration_blocker); | |
1243 | } | |
7267c094 | 1244 | g_free(hdev->mem); |
2817b260 | 1245 | g_free(hdev->mem_sections); |
e0547b59 MAL |
1246 | if (hdev->vhost_ops) { |
1247 | hdev->vhost_ops->vhost_backend_cleanup(hdev); | |
1248 | } | |
7b527247 | 1249 | assert(!hdev->log); |
e0547b59 MAL |
1250 | |
1251 | memset(hdev, 0, sizeof(struct vhost_dev)); | |
d5970055 MT |
1252 | } |
1253 | ||
b0b3db79 MT |
1254 | /* Stop processing guest IO notifications in qemu. |
1255 | * Start processing them in vhost in kernel. | |
1256 | */ | |
1257 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1258 | { | |
1c819449 | 1259 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
16617e36 | 1260 | int i, r, e; |
4afba631 | 1261 | |
310837de PB |
1262 | /* We will pass the notifiers to the kernel, make sure that QEMU |
1263 | * doesn't interfere. | |
1264 | */ | |
1265 | r = virtio_device_grab_ioeventfd(vdev); | |
1266 | if (r < 0) { | |
4afba631 | 1267 | error_report("binding does not support host notifiers"); |
b0b3db79 MT |
1268 | goto fail; |
1269 | } | |
1270 | ||
1271 | for (i = 0; i < hdev->nvqs; ++i) { | |
b1f0a33d CH |
1272 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1273 | true); | |
b0b3db79 | 1274 | if (r < 0) { |
4afba631 | 1275 | error_report("vhost VQ %d notifier binding failed: %d", i, -r); |
b0b3db79 MT |
1276 | goto fail_vq; |
1277 | } | |
1278 | } | |
1279 | ||
1280 | return 0; | |
1281 | fail_vq: | |
1282 | while (--i >= 0) { | |
b1f0a33d CH |
1283 | e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1284 | false); | |
16617e36 | 1285 | if (e < 0) { |
4afba631 | 1286 | error_report("vhost VQ %d notifier cleanup error: %d", i, -r); |
b0b3db79 | 1287 | } |
16617e36 | 1288 | assert (e >= 0); |
76143618 | 1289 | virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); |
b0b3db79 | 1290 | } |
310837de | 1291 | virtio_device_release_ioeventfd(vdev); |
b0b3db79 MT |
1292 | fail: |
1293 | return r; | |
1294 | } | |
1295 | ||
1296 | /* Stop processing guest IO notifications in vhost. | |
1297 | * Start processing them in qemu. | |
1298 | * This might actually run the qemu handlers right away, | |
1299 | * so virtio in qemu must be completely setup when this is called. | |
1300 | */ | |
1301 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1302 | { | |
1c819449 | 1303 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
b0b3db79 MT |
1304 | int i, r; |
1305 | ||
1306 | for (i = 0; i < hdev->nvqs; ++i) { | |
b1f0a33d CH |
1307 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1308 | false); | |
b0b3db79 | 1309 | if (r < 0) { |
4afba631 | 1310 | error_report("vhost VQ %d notifier cleanup failed: %d", i, -r); |
b0b3db79 MT |
1311 | } |
1312 | assert (r >= 0); | |
76143618 | 1313 | virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); |
b0b3db79 | 1314 | } |
310837de | 1315 | virtio_device_release_ioeventfd(vdev); |
b0b3db79 MT |
1316 | } |
1317 | ||
f56a1247 MT |
1318 | /* Test and clear event pending status. |
1319 | * Should be called after unmask to avoid losing events. | |
1320 | */ | |
1321 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
1322 | { | |
a9f98bb5 | 1323 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
a9f98bb5 | 1324 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
1325 | return event_notifier_test_and_clear(&vq->masked_notifier); |
1326 | } | |
1327 | ||
1328 | /* Mask/unmask events from this vq. */ | |
1329 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
1330 | bool mask) | |
1331 | { | |
1332 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 1333 | int r, index = n - hdev->vq_index; |
fc57fd99 | 1334 | struct vhost_vring_file file; |
f56a1247 | 1335 | |
8695de0f MAL |
1336 | /* should only be called after backend is connected */ |
1337 | assert(hdev->vhost_ops); | |
1338 | ||
f56a1247 | 1339 | if (mask) { |
5669655a | 1340 | assert(vdev->use_guest_notifier_mask); |
a9f98bb5 | 1341 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
1342 | } else { |
1343 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
1344 | } | |
fc57fd99 | 1345 | |
21e70425 MAL |
1346 | file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n); |
1347 | r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file); | |
162bba7f MAL |
1348 | if (r < 0) { |
1349 | VHOST_OPS_DEBUG("vhost_set_vring_call failed"); | |
1350 | } | |
f56a1247 MT |
1351 | } |
1352 | ||
9a2ba823 CH |
1353 | uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
1354 | uint64_t features) | |
2e6d46d7 NN |
1355 | { |
1356 | const int *bit = feature_bits; | |
1357 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1358 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1359 | if (!(hdev->features & bit_mask)) { |
1360 | features &= ~bit_mask; | |
1361 | } | |
1362 | bit++; | |
1363 | } | |
1364 | return features; | |
1365 | } | |
1366 | ||
1367 | void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, | |
9a2ba823 | 1368 | uint64_t features) |
2e6d46d7 NN |
1369 | { |
1370 | const int *bit = feature_bits; | |
1371 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1372 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1373 | if (features & bit_mask) { |
1374 | hdev->acked_features |= bit_mask; | |
1375 | } | |
1376 | bit++; | |
1377 | } | |
1378 | } | |
1379 | ||
4c3e257b CL |
1380 | int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, |
1381 | uint32_t config_len) | |
1382 | { | |
1383 | assert(hdev->vhost_ops); | |
1384 | ||
1385 | if (hdev->vhost_ops->vhost_get_config) { | |
1386 | return hdev->vhost_ops->vhost_get_config(hdev, config, config_len); | |
1387 | } | |
1388 | ||
1389 | return -1; | |
1390 | } | |
1391 | ||
1392 | int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data, | |
1393 | uint32_t offset, uint32_t size, uint32_t flags) | |
1394 | { | |
1395 | assert(hdev->vhost_ops); | |
1396 | ||
1397 | if (hdev->vhost_ops->vhost_set_config) { | |
1398 | return hdev->vhost_ops->vhost_set_config(hdev, data, offset, | |
1399 | size, flags); | |
1400 | } | |
1401 | ||
1402 | return -1; | |
1403 | } | |
1404 | ||
1405 | void vhost_dev_set_config_notifier(struct vhost_dev *hdev, | |
1406 | const VhostDevConfigOps *ops) | |
1407 | { | |
1408 | assert(hdev->vhost_ops); | |
1409 | hdev->config_ops = ops; | |
1410 | } | |
1411 | ||
b0b3db79 | 1412 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1413 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1414 | { | |
1415 | int i, r; | |
24f4fe34 | 1416 | |
8695de0f MAL |
1417 | /* should only be called after backend is connected */ |
1418 | assert(hdev->vhost_ops); | |
1419 | ||
24f4fe34 | 1420 | hdev->started = true; |
c471ad0e | 1421 | hdev->vdev = vdev; |
24f4fe34 | 1422 | |
d5970055 MT |
1423 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1424 | if (r < 0) { | |
54dd9321 | 1425 | goto fail_features; |
d5970055 | 1426 | } |
c471ad0e JW |
1427 | |
1428 | if (vhost_dev_has_iommu(hdev)) { | |
375f74f4 | 1429 | memory_listener_register(&hdev->iommu_listener, vdev->dma_as); |
c471ad0e JW |
1430 | } |
1431 | ||
21e70425 | 1432 | r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem); |
d5970055 | 1433 | if (r < 0) { |
c6409692 | 1434 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); |
d5970055 | 1435 | r = -errno; |
54dd9321 | 1436 | goto fail_mem; |
d5970055 | 1437 | } |
d154e0ba | 1438 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1439 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1440 | vdev, |
1441 | hdev->vqs + i, | |
1442 | hdev->vq_index + i); | |
d154e0ba MT |
1443 | if (r < 0) { |
1444 | goto fail_vq; | |
1445 | } | |
1446 | } | |
1447 | ||
d5970055 | 1448 | if (hdev->log_enabled) { |
e05ca820 MT |
1449 | uint64_t log_base; |
1450 | ||
d5970055 | 1451 | hdev->log_size = vhost_get_log_size(hdev); |
15324404 MAL |
1452 | hdev->log = vhost_log_get(hdev->log_size, |
1453 | vhost_dev_log_is_shared(hdev)); | |
309750fa | 1454 | log_base = (uintptr_t)hdev->log->log; |
c2bea314 | 1455 | r = hdev->vhost_ops->vhost_set_log_base(hdev, |
9a78a5dd MAL |
1456 | hdev->log_size ? log_base : 0, |
1457 | hdev->log); | |
d5970055 | 1458 | if (r < 0) { |
c6409692 | 1459 | VHOST_OPS_DEBUG("vhost_set_log_base failed"); |
d5970055 | 1460 | r = -errno; |
54dd9321 | 1461 | goto fail_log; |
d5970055 MT |
1462 | } |
1463 | } | |
d154e0ba | 1464 | |
c471ad0e JW |
1465 | if (vhost_dev_has_iommu(hdev)) { |
1466 | hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true); | |
1467 | ||
1468 | /* Update used ring information for IOTLB to work correctly, | |
1469 | * vhost-kernel code requires for this.*/ | |
1470 | for (i = 0; i < hdev->nvqs; ++i) { | |
1471 | struct vhost_virtqueue *vq = hdev->vqs + i; | |
1472 | vhost_device_iotlb_miss(hdev, vq->used_phys, true); | |
1473 | } | |
1474 | } | |
d5970055 | 1475 | return 0; |
54dd9321 | 1476 | fail_log: |
24bfa207 | 1477 | vhost_log_put(hdev, false); |
d5970055 MT |
1478 | fail_vq: |
1479 | while (--i >= 0) { | |
f56a1247 | 1480 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1481 | vdev, |
1482 | hdev->vqs + i, | |
1483 | hdev->vq_index + i); | |
d5970055 | 1484 | } |
a9f98bb5 | 1485 | i = hdev->nvqs; |
c471ad0e | 1486 | |
54dd9321 MT |
1487 | fail_mem: |
1488 | fail_features: | |
24f4fe34 MT |
1489 | |
1490 | hdev->started = false; | |
d5970055 MT |
1491 | return r; |
1492 | } | |
1493 | ||
b0b3db79 | 1494 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1495 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1496 | { | |
a9f98bb5 | 1497 | int i; |
54dd9321 | 1498 | |
8695de0f MAL |
1499 | /* should only be called after backend is connected */ |
1500 | assert(hdev->vhost_ops); | |
1501 | ||
d5970055 | 1502 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1503 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1504 | vdev, |
1505 | hdev->vqs + i, | |
1506 | hdev->vq_index + i); | |
d5970055 | 1507 | } |
54dd9321 | 1508 | |
c471ad0e JW |
1509 | if (vhost_dev_has_iommu(hdev)) { |
1510 | hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false); | |
375f74f4 | 1511 | memory_listener_unregister(&hdev->iommu_listener); |
c471ad0e | 1512 | } |
309750fa | 1513 | vhost_log_put(hdev, true); |
d5970055 | 1514 | hdev->started = false; |
c471ad0e | 1515 | hdev->vdev = NULL; |
d5970055 | 1516 | } |
950d94ba MAL |
1517 | |
1518 | int vhost_net_set_backend(struct vhost_dev *hdev, | |
1519 | struct vhost_vring_file *file) | |
1520 | { | |
1521 | if (hdev->vhost_ops->vhost_net_set_backend) { | |
1522 | return hdev->vhost_ops->vhost_net_set_backend(hdev, file); | |
1523 | } | |
1524 | ||
1525 | return -1; | |
1526 | } |