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Commit | Line | Data |
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d5970055 MT |
1 | /* |
2 | * vhost support | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Michael S. Tsirkin <mst@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
6b620ca3 PB |
11 | * |
12 | * Contributions after 2012-01-13 are licensed under the terms of the | |
13 | * GNU GPL, version 2 or (at your option) any later version. | |
d5970055 MT |
14 | */ |
15 | ||
9b8bfe21 | 16 | #include "qemu/osdep.h" |
da34e65c | 17 | #include "qapi/error.h" |
0d09e41a | 18 | #include "hw/virtio/vhost.h" |
d5970055 | 19 | #include "hw/hw.h" |
5444e768 | 20 | #include "qemu/atomic.h" |
1de7afc9 | 21 | #include "qemu/range.h" |
04b7a152 | 22 | #include "qemu/error-report.h" |
15324404 | 23 | #include "qemu/memfd.h" |
11078ae3 | 24 | #include <linux/vhost.h> |
022c62cb | 25 | #include "exec/address-spaces.h" |
1c819449 | 26 | #include "hw/virtio/virtio-bus.h" |
04b7a152 | 27 | #include "hw/virtio/virtio-access.h" |
795c40b8 | 28 | #include "migration/blocker.h" |
c471ad0e | 29 | #include "sysemu/dma.h" |
d5970055 | 30 | |
162bba7f MAL |
31 | /* enabled until disconnected backend stabilizes */ |
32 | #define _VHOST_DEBUG 1 | |
33 | ||
34 | #ifdef _VHOST_DEBUG | |
35 | #define VHOST_OPS_DEBUG(fmt, ...) \ | |
36 | do { error_report(fmt ": %s (%d)", ## __VA_ARGS__, \ | |
37 | strerror(errno), errno); } while (0) | |
38 | #else | |
39 | #define VHOST_OPS_DEBUG(fmt, ...) \ | |
40 | do { } while (0) | |
41 | #endif | |
42 | ||
309750fa | 43 | static struct vhost_log *vhost_log; |
15324404 | 44 | static struct vhost_log *vhost_log_shm; |
309750fa | 45 | |
2ce68e4c IM |
46 | static unsigned int used_memslots; |
47 | static QLIST_HEAD(, vhost_dev) vhost_devices = | |
48 | QLIST_HEAD_INITIALIZER(vhost_devices); | |
49 | ||
50 | bool vhost_has_free_slot(void) | |
51 | { | |
52 | unsigned int slots_limit = ~0U; | |
53 | struct vhost_dev *hdev; | |
54 | ||
55 | QLIST_FOREACH(hdev, &vhost_devices, entry) { | |
56 | unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); | |
57 | slots_limit = MIN(slots_limit, r); | |
58 | } | |
59 | return slots_limit > used_memslots; | |
60 | } | |
61 | ||
d5970055 | 62 | static void vhost_dev_sync_region(struct vhost_dev *dev, |
2817b260 | 63 | MemoryRegionSection *section, |
d5970055 MT |
64 | uint64_t mfirst, uint64_t mlast, |
65 | uint64_t rfirst, uint64_t rlast) | |
66 | { | |
309750fa JW |
67 | vhost_log_chunk_t *log = dev->log->log; |
68 | ||
d5970055 MT |
69 | uint64_t start = MAX(mfirst, rfirst); |
70 | uint64_t end = MIN(mlast, rlast); | |
309750fa JW |
71 | vhost_log_chunk_t *from = log + start / VHOST_LOG_CHUNK; |
72 | vhost_log_chunk_t *to = log + end / VHOST_LOG_CHUNK + 1; | |
33c5793b | 73 | uint64_t addr = QEMU_ALIGN_DOWN(start, VHOST_LOG_CHUNK); |
d5970055 | 74 | |
d5970055 MT |
75 | if (end < start) { |
76 | return; | |
77 | } | |
e314672a | 78 | assert(end / VHOST_LOG_CHUNK < dev->log_size); |
fbbaf9ae | 79 | assert(start / VHOST_LOG_CHUNK < dev->log_size); |
e314672a | 80 | |
d5970055 MT |
81 | for (;from < to; ++from) { |
82 | vhost_log_chunk_t log; | |
d5970055 MT |
83 | /* We first check with non-atomic: much cheaper, |
84 | * and we expect non-dirty to be the common case. */ | |
85 | if (!*from) { | |
0c600ce2 | 86 | addr += VHOST_LOG_CHUNK; |
d5970055 MT |
87 | continue; |
88 | } | |
5444e768 PB |
89 | /* Data must be read atomically. We don't really need barrier semantics |
90 | * but it's easier to use atomic_* than roll our own. */ | |
91 | log = atomic_xchg(from, 0); | |
747eb78b NC |
92 | while (log) { |
93 | int bit = ctzl(log); | |
6b37a23d MT |
94 | hwaddr page_addr; |
95 | hwaddr section_offset; | |
96 | hwaddr mr_offset; | |
6b37a23d MT |
97 | page_addr = addr + bit * VHOST_LOG_PAGE; |
98 | section_offset = page_addr - section->offset_within_address_space; | |
99 | mr_offset = section_offset + section->offset_within_region; | |
100 | memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); | |
d5970055 MT |
101 | log &= ~(0x1ull << bit); |
102 | } | |
103 | addr += VHOST_LOG_CHUNK; | |
104 | } | |
105 | } | |
106 | ||
04097f7c | 107 | static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
2817b260 | 108 | MemoryRegionSection *section, |
6b37a23d MT |
109 | hwaddr first, |
110 | hwaddr last) | |
d5970055 | 111 | { |
d5970055 | 112 | int i; |
6b37a23d MT |
113 | hwaddr start_addr; |
114 | hwaddr end_addr; | |
04097f7c | 115 | |
d5970055 MT |
116 | if (!dev->log_enabled || !dev->started) { |
117 | return 0; | |
118 | } | |
6b37a23d | 119 | start_addr = section->offset_within_address_space; |
052e87b0 | 120 | end_addr = range_get_last(start_addr, int128_get64(section->size)); |
6b37a23d MT |
121 | start_addr = MAX(first, start_addr); |
122 | end_addr = MIN(last, end_addr); | |
123 | ||
d5970055 MT |
124 | for (i = 0; i < dev->mem->nregions; ++i) { |
125 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
2817b260 | 126 | vhost_dev_sync_region(dev, section, start_addr, end_addr, |
d5970055 MT |
127 | reg->guest_phys_addr, |
128 | range_get_last(reg->guest_phys_addr, | |
129 | reg->memory_size)); | |
130 | } | |
131 | for (i = 0; i < dev->nvqs; ++i) { | |
132 | struct vhost_virtqueue *vq = dev->vqs + i; | |
2817b260 | 133 | vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
d5970055 MT |
134 | range_get_last(vq->used_phys, vq->used_size)); |
135 | } | |
136 | return 0; | |
137 | } | |
138 | ||
04097f7c AK |
139 | static void vhost_log_sync(MemoryListener *listener, |
140 | MemoryRegionSection *section) | |
141 | { | |
142 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
143 | memory_listener); | |
6b37a23d MT |
144 | vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
145 | } | |
04097f7c | 146 | |
6b37a23d MT |
147 | static void vhost_log_sync_range(struct vhost_dev *dev, |
148 | hwaddr first, hwaddr last) | |
149 | { | |
150 | int i; | |
151 | /* FIXME: this is N^2 in number of sections */ | |
152 | for (i = 0; i < dev->n_mem_sections; ++i) { | |
153 | MemoryRegionSection *section = &dev->mem_sections[i]; | |
154 | vhost_sync_dirty_bitmap(dev, section, first, last); | |
155 | } | |
04097f7c AK |
156 | } |
157 | ||
d5970055 MT |
158 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) |
159 | { | |
160 | uint64_t log_size = 0; | |
161 | int i; | |
162 | for (i = 0; i < dev->mem->nregions; ++i) { | |
163 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
164 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
165 | reg->memory_size); | |
166 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
167 | } | |
168 | for (i = 0; i < dev->nvqs; ++i) { | |
169 | struct vhost_virtqueue *vq = dev->vqs + i; | |
170 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
171 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
172 | } | |
173 | return log_size; | |
174 | } | |
15324404 MAL |
175 | |
176 | static struct vhost_log *vhost_log_alloc(uint64_t size, bool share) | |
309750fa | 177 | { |
0f2956f9 | 178 | Error *err = NULL; |
15324404 MAL |
179 | struct vhost_log *log; |
180 | uint64_t logsize = size * sizeof(*(log->log)); | |
181 | int fd = -1; | |
182 | ||
183 | log = g_new0(struct vhost_log, 1); | |
184 | if (share) { | |
185 | log->log = qemu_memfd_alloc("vhost-log", logsize, | |
186 | F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, | |
0f2956f9 MAL |
187 | &fd, &err); |
188 | if (err) { | |
189 | error_report_err(err); | |
190 | g_free(log); | |
191 | return NULL; | |
192 | } | |
15324404 MAL |
193 | memset(log->log, 0, logsize); |
194 | } else { | |
195 | log->log = g_malloc0(logsize); | |
196 | } | |
309750fa JW |
197 | |
198 | log->size = size; | |
199 | log->refcnt = 1; | |
15324404 | 200 | log->fd = fd; |
309750fa JW |
201 | |
202 | return log; | |
203 | } | |
204 | ||
15324404 | 205 | static struct vhost_log *vhost_log_get(uint64_t size, bool share) |
309750fa | 206 | { |
15324404 MAL |
207 | struct vhost_log *log = share ? vhost_log_shm : vhost_log; |
208 | ||
209 | if (!log || log->size != size) { | |
210 | log = vhost_log_alloc(size, share); | |
211 | if (share) { | |
212 | vhost_log_shm = log; | |
213 | } else { | |
214 | vhost_log = log; | |
215 | } | |
309750fa | 216 | } else { |
15324404 | 217 | ++log->refcnt; |
309750fa JW |
218 | } |
219 | ||
15324404 | 220 | return log; |
309750fa JW |
221 | } |
222 | ||
223 | static void vhost_log_put(struct vhost_dev *dev, bool sync) | |
224 | { | |
225 | struct vhost_log *log = dev->log; | |
226 | ||
227 | if (!log) { | |
228 | return; | |
229 | } | |
230 | ||
231 | --log->refcnt; | |
232 | if (log->refcnt == 0) { | |
233 | /* Sync only the range covered by the old log */ | |
234 | if (dev->log_size && sync) { | |
235 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
236 | } | |
15324404 | 237 | |
309750fa | 238 | if (vhost_log == log) { |
15324404 | 239 | g_free(log->log); |
309750fa | 240 | vhost_log = NULL; |
15324404 MAL |
241 | } else if (vhost_log_shm == log) { |
242 | qemu_memfd_free(log->log, log->size * sizeof(*(log->log)), | |
243 | log->fd); | |
244 | vhost_log_shm = NULL; | |
309750fa | 245 | } |
15324404 | 246 | |
309750fa JW |
247 | g_free(log); |
248 | } | |
5c0ba1be FF |
249 | |
250 | dev->log = NULL; | |
251 | dev->log_size = 0; | |
309750fa | 252 | } |
d5970055 | 253 | |
15324404 MAL |
254 | static bool vhost_dev_log_is_shared(struct vhost_dev *dev) |
255 | { | |
256 | return dev->vhost_ops->vhost_requires_shm_log && | |
257 | dev->vhost_ops->vhost_requires_shm_log(dev); | |
258 | } | |
259 | ||
260 | static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t size) | |
d5970055 | 261 | { |
15324404 | 262 | struct vhost_log *log = vhost_log_get(size, vhost_dev_log_is_shared(dev)); |
309750fa | 263 | uint64_t log_base = (uintptr_t)log->log; |
6b37a23d | 264 | int r; |
6528499f | 265 | |
636f4ddd MAL |
266 | /* inform backend of log switching, this must be done before |
267 | releasing the current log, to ensure no logging is lost */ | |
9a78a5dd | 268 | r = dev->vhost_ops->vhost_set_log_base(dev, log_base, log); |
162bba7f MAL |
269 | if (r < 0) { |
270 | VHOST_OPS_DEBUG("vhost_set_log_base failed"); | |
271 | } | |
272 | ||
309750fa | 273 | vhost_log_put(dev, true); |
d5970055 MT |
274 | dev->log = log; |
275 | dev->log_size = size; | |
276 | } | |
277 | ||
c471ad0e JW |
278 | static int vhost_dev_has_iommu(struct vhost_dev *dev) |
279 | { | |
280 | VirtIODevice *vdev = dev->vdev; | |
c471ad0e | 281 | |
375f74f4 | 282 | return virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); |
c471ad0e JW |
283 | } |
284 | ||
285 | static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr, | |
286 | hwaddr *plen, int is_write) | |
287 | { | |
288 | if (!vhost_dev_has_iommu(dev)) { | |
289 | return cpu_physical_memory_map(addr, plen, is_write); | |
290 | } else { | |
291 | return (void *)(uintptr_t)addr; | |
292 | } | |
293 | } | |
294 | ||
295 | static void vhost_memory_unmap(struct vhost_dev *dev, void *buffer, | |
296 | hwaddr len, int is_write, | |
297 | hwaddr access_len) | |
298 | { | |
299 | if (!vhost_dev_has_iommu(dev)) { | |
300 | cpu_physical_memory_unmap(buffer, len, is_write, access_len); | |
301 | } | |
302 | } | |
f1f9e6c5 | 303 | |
0ca1fd2d DDAG |
304 | static int vhost_verify_ring_part_mapping(void *ring_hva, |
305 | uint64_t ring_gpa, | |
306 | uint64_t ring_size, | |
307 | void *reg_hva, | |
308 | uint64_t reg_gpa, | |
309 | uint64_t reg_size) | |
f1f9e6c5 | 310 | { |
0ca1fd2d DDAG |
311 | uint64_t hva_ring_offset; |
312 | uint64_t ring_last = range_get_last(ring_gpa, ring_size); | |
313 | uint64_t reg_last = range_get_last(reg_gpa, reg_size); | |
f1f9e6c5 | 314 | |
0ca1fd2d | 315 | if (ring_last < reg_gpa || ring_gpa > reg_last) { |
f1f9e6c5 GK |
316 | return 0; |
317 | } | |
0ca1fd2d DDAG |
318 | /* check that whole ring's is mapped */ |
319 | if (ring_last > reg_last) { | |
320 | return -ENOMEM; | |
f1f9e6c5 | 321 | } |
0ca1fd2d DDAG |
322 | /* check that ring's MemoryRegion wasn't replaced */ |
323 | hva_ring_offset = ring_gpa - reg_gpa; | |
324 | if (ring_hva != reg_hva + hva_ring_offset) { | |
325 | return -EBUSY; | |
f1f9e6c5 | 326 | } |
0ca1fd2d DDAG |
327 | |
328 | return 0; | |
f1f9e6c5 GK |
329 | } |
330 | ||
d5970055 | 331 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, |
0ca1fd2d DDAG |
332 | void *reg_hva, |
333 | uint64_t reg_gpa, | |
334 | uint64_t reg_size) | |
d5970055 | 335 | { |
f1f9e6c5 | 336 | int i, j; |
8617343f | 337 | int r = 0; |
f1f9e6c5 GK |
338 | const char *part_name[] = { |
339 | "descriptor table", | |
340 | "available ring", | |
341 | "used ring" | |
342 | }; | |
8617343f | 343 | |
f1f9e6c5 | 344 | for (i = 0; i < dev->nvqs; ++i) { |
d5970055 | 345 | struct vhost_virtqueue *vq = dev->vqs + i; |
d5970055 | 346 | |
f1f9e6c5 | 347 | j = 0; |
0ca1fd2d DDAG |
348 | r = vhost_verify_ring_part_mapping( |
349 | vq->desc, vq->desc_phys, vq->desc_size, | |
350 | reg_hva, reg_gpa, reg_size); | |
2fe45ec3 | 351 | if (r) { |
f1f9e6c5 | 352 | break; |
d5970055 | 353 | } |
f1f9e6c5 GK |
354 | |
355 | j++; | |
0ca1fd2d DDAG |
356 | r = vhost_verify_ring_part_mapping( |
357 | vq->desc, vq->desc_phys, vq->desc_size, | |
358 | reg_hva, reg_gpa, reg_size); | |
2fe45ec3 | 359 | if (r) { |
f1f9e6c5 | 360 | break; |
d5970055 | 361 | } |
f1f9e6c5 GK |
362 | |
363 | j++; | |
0ca1fd2d DDAG |
364 | r = vhost_verify_ring_part_mapping( |
365 | vq->desc, vq->desc_phys, vq->desc_size, | |
366 | reg_hva, reg_gpa, reg_size); | |
2fe45ec3 | 367 | if (r) { |
f1f9e6c5 | 368 | break; |
d5970055 | 369 | } |
f1f9e6c5 GK |
370 | } |
371 | ||
372 | if (r == -ENOMEM) { | |
373 | error_report("Unable to map %s for ring %d", part_name[j], i); | |
374 | } else if (r == -EBUSY) { | |
375 | error_report("%s relocated for ring %d", part_name[j], i); | |
d5970055 | 376 | } |
8617343f | 377 | return r; |
d5970055 MT |
378 | } |
379 | ||
af603142 NB |
380 | static bool vhost_section(MemoryRegionSection *section) |
381 | { | |
d56ec1e9 MT |
382 | return memory_region_is_ram(section->mr) && |
383 | !memory_region_is_rom(section->mr); | |
af603142 NB |
384 | } |
385 | ||
386 | static void vhost_begin(MemoryListener *listener) | |
387 | { | |
388 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
389 | memory_listener); | |
c44317ef DDAG |
390 | dev->tmp_sections = NULL; |
391 | dev->n_tmp_sections = 0; | |
af603142 | 392 | } |
d5970055 | 393 | |
af603142 NB |
394 | static void vhost_commit(MemoryListener *listener) |
395 | { | |
396 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
397 | memory_listener); | |
c44317ef DDAG |
398 | MemoryRegionSection *old_sections; |
399 | int n_old_sections; | |
af603142 | 400 | uint64_t log_size; |
ade6d081 | 401 | size_t regions_size; |
af603142 | 402 | int r; |
0ca1fd2d | 403 | int i; |
ade6d081 | 404 | bool changed = false; |
af603142 | 405 | |
ade6d081 DDAG |
406 | /* Note we can be called before the device is started, but then |
407 | * starting the device calls set_mem_table, so we need to have | |
408 | * built the data structures. | |
409 | */ | |
c44317ef DDAG |
410 | old_sections = dev->mem_sections; |
411 | n_old_sections = dev->n_mem_sections; | |
412 | dev->mem_sections = dev->tmp_sections; | |
413 | dev->n_mem_sections = dev->n_tmp_sections; | |
414 | ||
ade6d081 DDAG |
415 | if (dev->n_mem_sections != n_old_sections) { |
416 | changed = true; | |
417 | } else { | |
418 | /* Same size, lets check the contents */ | |
419 | changed = n_old_sections && memcmp(dev->mem_sections, old_sections, | |
420 | n_old_sections * sizeof(old_sections[0])) != 0; | |
af603142 | 421 | } |
ade6d081 DDAG |
422 | |
423 | trace_vhost_commit(dev->started, changed); | |
424 | if (!changed) { | |
c44317ef | 425 | goto out; |
d5970055 | 426 | } |
ade6d081 DDAG |
427 | |
428 | /* Rebuild the regions list from the new sections list */ | |
429 | regions_size = offsetof(struct vhost_memory, regions) + | |
430 | dev->n_mem_sections * sizeof dev->mem->regions[0]; | |
431 | dev->mem = g_realloc(dev->mem, regions_size); | |
432 | dev->mem->nregions = dev->n_mem_sections; | |
433 | used_memslots = dev->mem->nregions; | |
434 | for (i = 0; i < dev->n_mem_sections; i++) { | |
435 | struct vhost_memory_region *cur_vmr = dev->mem->regions + i; | |
436 | struct MemoryRegionSection *mrs = dev->mem_sections + i; | |
437 | ||
438 | cur_vmr->guest_phys_addr = mrs->offset_within_address_space; | |
439 | cur_vmr->memory_size = int128_get64(mrs->size); | |
440 | cur_vmr->userspace_addr = | |
441 | (uintptr_t)memory_region_get_ram_ptr(mrs->mr) + | |
442 | mrs->offset_within_region; | |
443 | cur_vmr->flags_padding = 0; | |
444 | } | |
445 | ||
446 | if (!dev->started) { | |
c44317ef | 447 | goto out; |
af603142 | 448 | } |
d5970055 | 449 | |
0ca1fd2d DDAG |
450 | for (i = 0; i < dev->mem->nregions; i++) { |
451 | if (vhost_verify_ring_mappings(dev, | |
452 | (void *)(uintptr_t)dev->mem->regions[i].userspace_addr, | |
453 | dev->mem->regions[i].guest_phys_addr, | |
454 | dev->mem->regions[i].memory_size)) { | |
455 | error_report("Verify ring failure on region %d", i); | |
456 | abort(); | |
457 | } | |
d5970055 MT |
458 | } |
459 | ||
460 | if (!dev->log_enabled) { | |
21e70425 | 461 | r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
162bba7f MAL |
462 | if (r < 0) { |
463 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); | |
464 | } | |
c44317ef | 465 | goto out; |
d5970055 MT |
466 | } |
467 | log_size = vhost_get_log_size(dev); | |
468 | /* We allocate an extra 4K bytes to log, | |
469 | * to reduce the * number of reallocations. */ | |
470 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
471 | /* To log more, must increase log size before table update. */ | |
472 | if (dev->log_size < log_size) { | |
473 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
474 | } | |
21e70425 | 475 | r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
162bba7f MAL |
476 | if (r < 0) { |
477 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); | |
478 | } | |
d5970055 MT |
479 | /* To log less, can only decrease log size after table update. */ |
480 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
481 | vhost_dev_log_resize(dev, log_size); | |
482 | } | |
c44317ef DDAG |
483 | |
484 | out: | |
485 | /* Deref the old list of sections, this must happen _after_ the | |
486 | * vhost_set_mem_table to ensure the client isn't still using the | |
487 | * section we're about to unref. | |
488 | */ | |
489 | while (n_old_sections--) { | |
490 | memory_region_unref(old_sections[n_old_sections].mr); | |
491 | } | |
492 | g_free(old_sections); | |
493 | return; | |
494 | } | |
495 | ||
48d7c975 DDAG |
496 | /* Adds the section data to the tmp_section structure. |
497 | * It relies on the listener calling us in memory address order | |
498 | * and for each region (via the _add and _nop methods) to | |
499 | * join neighbours. | |
500 | */ | |
501 | static void vhost_region_add_section(struct vhost_dev *dev, | |
502 | MemoryRegionSection *section) | |
c44317ef | 503 | { |
48d7c975 DDAG |
504 | bool need_add = true; |
505 | uint64_t mrs_size = int128_get64(section->size); | |
506 | uint64_t mrs_gpa = section->offset_within_address_space; | |
507 | uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) + | |
508 | section->offset_within_region; | |
509 | ||
510 | trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size, | |
511 | mrs_host); | |
512 | ||
513 | bool log_dirty = memory_region_get_dirty_log_mask(section->mr) & | |
514 | ~(1 << DIRTY_MEMORY_MIGRATION); | |
515 | if (log_dirty) { | |
516 | return; | |
517 | } | |
518 | ||
519 | if (dev->n_tmp_sections) { | |
520 | /* Since we already have at least one section, lets see if | |
521 | * this extends it; since we're scanning in order, we only | |
522 | * have to look at the last one, and the FlatView that calls | |
523 | * us shouldn't have overlaps. | |
524 | */ | |
525 | MemoryRegionSection *prev_sec = dev->tmp_sections + | |
526 | (dev->n_tmp_sections - 1); | |
527 | uint64_t prev_gpa_start = prev_sec->offset_within_address_space; | |
528 | uint64_t prev_size = int128_get64(prev_sec->size); | |
529 | uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size); | |
530 | uint64_t prev_host_start = | |
531 | (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) + | |
532 | prev_sec->offset_within_region; | |
533 | uint64_t prev_host_end = range_get_last(prev_host_start, prev_size); | |
534 | ||
535 | if (prev_gpa_end + 1 == mrs_gpa && | |
536 | prev_host_end + 1 == mrs_host && | |
537 | section->mr == prev_sec->mr && | |
538 | (!dev->vhost_ops->vhost_backend_can_merge || | |
539 | dev->vhost_ops->vhost_backend_can_merge(dev, | |
540 | mrs_host, mrs_size, | |
541 | prev_host_start, prev_size))) { | |
542 | /* The two sections abut */ | |
543 | need_add = false; | |
544 | prev_sec->size = int128_add(prev_sec->size, section->size); | |
545 | trace_vhost_region_add_section_abut(section->mr->name, | |
546 | mrs_size + prev_size); | |
547 | } | |
548 | } | |
549 | ||
550 | if (need_add) { | |
551 | ++dev->n_tmp_sections; | |
552 | dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections, | |
553 | dev->n_tmp_sections); | |
554 | dev->tmp_sections[dev->n_tmp_sections - 1] = *section; | |
555 | /* The flatview isn't stable and we don't use it, making it NULL | |
556 | * means we can memcmp the list. | |
557 | */ | |
558 | dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL; | |
559 | memory_region_ref(section->mr); | |
560 | } | |
50c1e149 AK |
561 | } |
562 | ||
938eeb64 DDAG |
563 | /* Used for both add and nop callbacks */ |
564 | static void vhost_region_addnop(MemoryListener *listener, | |
565 | MemoryRegionSection *section) | |
04097f7c | 566 | { |
2817b260 AK |
567 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
568 | memory_listener); | |
569 | ||
c49450b9 AK |
570 | if (!vhost_section(section)) { |
571 | return; | |
572 | } | |
48d7c975 | 573 | vhost_region_add_section(dev, section); |
04097f7c AK |
574 | } |
575 | ||
375f74f4 JW |
576 | static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) |
577 | { | |
578 | struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n); | |
579 | struct vhost_dev *hdev = iommu->hdev; | |
580 | hwaddr iova = iotlb->iova + iommu->iommu_offset; | |
581 | ||
020e571b MC |
582 | if (vhost_backend_invalidate_device_iotlb(hdev, iova, |
583 | iotlb->addr_mask + 1)) { | |
375f74f4 JW |
584 | error_report("Fail to invalidate device iotlb"); |
585 | } | |
586 | } | |
587 | ||
588 | static void vhost_iommu_region_add(MemoryListener *listener, | |
589 | MemoryRegionSection *section) | |
590 | { | |
591 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
592 | iommu_listener); | |
593 | struct vhost_iommu *iommu; | |
698feb5e | 594 | Int128 end; |
375f74f4 JW |
595 | |
596 | if (!memory_region_is_iommu(section->mr)) { | |
597 | return; | |
598 | } | |
599 | ||
600 | iommu = g_malloc0(sizeof(*iommu)); | |
698feb5e PX |
601 | end = int128_add(int128_make64(section->offset_within_region), |
602 | section->size); | |
603 | end = int128_sub(end, int128_one()); | |
604 | iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify, | |
605 | IOMMU_NOTIFIER_UNMAP, | |
606 | section->offset_within_region, | |
607 | int128_get64(end)); | |
375f74f4 JW |
608 | iommu->mr = section->mr; |
609 | iommu->iommu_offset = section->offset_within_address_space - | |
610 | section->offset_within_region; | |
611 | iommu->hdev = dev; | |
612 | memory_region_register_iommu_notifier(section->mr, &iommu->n); | |
613 | QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next); | |
614 | /* TODO: can replay help performance here? */ | |
615 | } | |
616 | ||
617 | static void vhost_iommu_region_del(MemoryListener *listener, | |
618 | MemoryRegionSection *section) | |
619 | { | |
620 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
621 | iommu_listener); | |
622 | struct vhost_iommu *iommu; | |
623 | ||
624 | if (!memory_region_is_iommu(section->mr)) { | |
625 | return; | |
626 | } | |
627 | ||
628 | QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) { | |
698feb5e PX |
629 | if (iommu->mr == section->mr && |
630 | iommu->n.start == section->offset_within_region) { | |
375f74f4 JW |
631 | memory_region_unregister_iommu_notifier(iommu->mr, |
632 | &iommu->n); | |
633 | QLIST_REMOVE(iommu, iommu_next); | |
634 | g_free(iommu); | |
635 | break; | |
636 | } | |
637 | } | |
638 | } | |
639 | ||
d5970055 MT |
640 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
641 | struct vhost_virtqueue *vq, | |
642 | unsigned idx, bool enable_log) | |
643 | { | |
644 | struct vhost_vring_addr addr = { | |
645 | .index = idx, | |
2b3af999 SW |
646 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
647 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
648 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
649 | .log_guest_addr = vq->used_phys, |
650 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
651 | }; | |
21e70425 | 652 | int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr); |
d5970055 | 653 | if (r < 0) { |
c6409692 | 654 | VHOST_OPS_DEBUG("vhost_set_vring_addr failed"); |
d5970055 MT |
655 | return -errno; |
656 | } | |
657 | return 0; | |
658 | } | |
659 | ||
c471ad0e JW |
660 | static int vhost_dev_set_features(struct vhost_dev *dev, |
661 | bool enable_log) | |
d5970055 MT |
662 | { |
663 | uint64_t features = dev->acked_features; | |
664 | int r; | |
665 | if (enable_log) { | |
9a2ba823 | 666 | features |= 0x1ULL << VHOST_F_LOG_ALL; |
d5970055 | 667 | } |
21e70425 | 668 | r = dev->vhost_ops->vhost_set_features(dev, features); |
c6409692 MAL |
669 | if (r < 0) { |
670 | VHOST_OPS_DEBUG("vhost_set_features failed"); | |
671 | } | |
d5970055 MT |
672 | return r < 0 ? -errno : 0; |
673 | } | |
674 | ||
675 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
676 | { | |
162bba7f | 677 | int r, i, idx; |
d5970055 MT |
678 | r = vhost_dev_set_features(dev, enable_log); |
679 | if (r < 0) { | |
680 | goto err_features; | |
681 | } | |
682 | for (i = 0; i < dev->nvqs; ++i) { | |
25a2a920 TC |
683 | idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
684 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, | |
d5970055 MT |
685 | enable_log); |
686 | if (r < 0) { | |
687 | goto err_vq; | |
688 | } | |
689 | } | |
690 | return 0; | |
691 | err_vq: | |
692 | for (; i >= 0; --i) { | |
25a2a920 | 693 | idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
162bba7f MAL |
694 | vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, |
695 | dev->log_enabled); | |
d5970055 | 696 | } |
162bba7f | 697 | vhost_dev_set_features(dev, dev->log_enabled); |
d5970055 MT |
698 | err_features: |
699 | return r; | |
700 | } | |
701 | ||
04097f7c | 702 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 703 | { |
04097f7c AK |
704 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
705 | memory_listener); | |
d5970055 MT |
706 | int r; |
707 | if (!!enable == dev->log_enabled) { | |
708 | return 0; | |
709 | } | |
710 | if (!dev->started) { | |
711 | dev->log_enabled = enable; | |
712 | return 0; | |
713 | } | |
714 | if (!enable) { | |
715 | r = vhost_dev_set_log(dev, false); | |
716 | if (r < 0) { | |
717 | return r; | |
718 | } | |
309750fa | 719 | vhost_log_put(dev, false); |
d5970055 MT |
720 | } else { |
721 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
722 | r = vhost_dev_set_log(dev, true); | |
723 | if (r < 0) { | |
724 | return r; | |
725 | } | |
726 | } | |
727 | dev->log_enabled = enable; | |
728 | return 0; | |
729 | } | |
730 | ||
04097f7c AK |
731 | static void vhost_log_global_start(MemoryListener *listener) |
732 | { | |
733 | int r; | |
734 | ||
735 | r = vhost_migration_log(listener, true); | |
736 | if (r < 0) { | |
737 | abort(); | |
738 | } | |
739 | } | |
740 | ||
741 | static void vhost_log_global_stop(MemoryListener *listener) | |
742 | { | |
743 | int r; | |
744 | ||
745 | r = vhost_migration_log(listener, false); | |
746 | if (r < 0) { | |
747 | abort(); | |
748 | } | |
749 | } | |
750 | ||
751 | static void vhost_log_start(MemoryListener *listener, | |
b2dfd71c PB |
752 | MemoryRegionSection *section, |
753 | int old, int new) | |
04097f7c AK |
754 | { |
755 | /* FIXME: implement */ | |
756 | } | |
757 | ||
758 | static void vhost_log_stop(MemoryListener *listener, | |
b2dfd71c PB |
759 | MemoryRegionSection *section, |
760 | int old, int new) | |
04097f7c AK |
761 | { |
762 | /* FIXME: implement */ | |
763 | } | |
764 | ||
46f70ff1 GK |
765 | /* The vhost driver natively knows how to handle the vrings of non |
766 | * cross-endian legacy devices and modern devices. Only legacy devices | |
767 | * exposed to a bi-endian guest may require the vhost driver to use a | |
768 | * specific endianness. | |
769 | */ | |
a122ab24 GK |
770 | static inline bool vhost_needs_vring_endian(VirtIODevice *vdev) |
771 | { | |
e5848123 GK |
772 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
773 | return false; | |
774 | } | |
a122ab24 | 775 | #ifdef HOST_WORDS_BIGENDIAN |
46f70ff1 | 776 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE; |
a122ab24 | 777 | #else |
46f70ff1 | 778 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; |
a122ab24 | 779 | #endif |
a122ab24 GK |
780 | } |
781 | ||
04b7a152 GK |
782 | static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, |
783 | bool is_big_endian, | |
784 | int vhost_vq_index) | |
785 | { | |
786 | struct vhost_vring_state s = { | |
787 | .index = vhost_vq_index, | |
788 | .num = is_big_endian | |
789 | }; | |
790 | ||
21e70425 | 791 | if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) { |
04b7a152 GK |
792 | return 0; |
793 | } | |
794 | ||
c6409692 | 795 | VHOST_OPS_DEBUG("vhost_set_vring_endian failed"); |
04b7a152 GK |
796 | if (errno == ENOTTY) { |
797 | error_report("vhost does not support cross-endian"); | |
798 | return -ENOSYS; | |
799 | } | |
800 | ||
801 | return -errno; | |
802 | } | |
803 | ||
c471ad0e JW |
804 | static int vhost_memory_region_lookup(struct vhost_dev *hdev, |
805 | uint64_t gpa, uint64_t *uaddr, | |
806 | uint64_t *len) | |
807 | { | |
808 | int i; | |
809 | ||
810 | for (i = 0; i < hdev->mem->nregions; i++) { | |
811 | struct vhost_memory_region *reg = hdev->mem->regions + i; | |
812 | ||
813 | if (gpa >= reg->guest_phys_addr && | |
814 | reg->guest_phys_addr + reg->memory_size > gpa) { | |
815 | *uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr; | |
816 | *len = reg->guest_phys_addr + reg->memory_size - gpa; | |
817 | return 0; | |
818 | } | |
819 | } | |
820 | ||
821 | return -EFAULT; | |
822 | } | |
823 | ||
fc58bd0d | 824 | int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write) |
c471ad0e JW |
825 | { |
826 | IOMMUTLBEntry iotlb; | |
827 | uint64_t uaddr, len; | |
fc58bd0d | 828 | int ret = -EFAULT; |
c471ad0e JW |
829 | |
830 | rcu_read_lock(); | |
831 | ||
832 | iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as, | |
833 | iova, write); | |
834 | if (iotlb.target_as != NULL) { | |
fc58bd0d MC |
835 | ret = vhost_memory_region_lookup(dev, iotlb.translated_addr, |
836 | &uaddr, &len); | |
837 | if (ret) { | |
c471ad0e JW |
838 | error_report("Fail to lookup the translated address " |
839 | "%"PRIx64, iotlb.translated_addr); | |
840 | goto out; | |
841 | } | |
842 | ||
843 | len = MIN(iotlb.addr_mask + 1, len); | |
844 | iova = iova & ~iotlb.addr_mask; | |
845 | ||
020e571b MC |
846 | ret = vhost_backend_update_device_iotlb(dev, iova, uaddr, |
847 | len, iotlb.perm); | |
fc58bd0d | 848 | if (ret) { |
c471ad0e JW |
849 | error_report("Fail to update device iotlb"); |
850 | goto out; | |
851 | } | |
852 | } | |
853 | out: | |
854 | rcu_read_unlock(); | |
fc58bd0d MC |
855 | |
856 | return ret; | |
c471ad0e JW |
857 | } |
858 | ||
f56a1247 | 859 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
860 | struct VirtIODevice *vdev, |
861 | struct vhost_virtqueue *vq, | |
862 | unsigned idx) | |
863 | { | |
96a3d98d JW |
864 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
865 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
866 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
a8170e5e | 867 | hwaddr s, l, a; |
d5970055 | 868 | int r; |
21e70425 | 869 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
d5970055 | 870 | struct vhost_vring_file file = { |
a9f98bb5 | 871 | .index = vhost_vq_index |
d5970055 MT |
872 | }; |
873 | struct vhost_vring_state state = { | |
a9f98bb5 | 874 | .index = vhost_vq_index |
d5970055 MT |
875 | }; |
876 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
877 | ||
a9f98bb5 | 878 | |
d5970055 | 879 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
21e70425 | 880 | r = dev->vhost_ops->vhost_set_vring_num(dev, &state); |
d5970055 | 881 | if (r) { |
c6409692 | 882 | VHOST_OPS_DEBUG("vhost_set_vring_num failed"); |
d5970055 MT |
883 | return -errno; |
884 | } | |
885 | ||
886 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
21e70425 | 887 | r = dev->vhost_ops->vhost_set_vring_base(dev, &state); |
d5970055 | 888 | if (r) { |
c6409692 | 889 | VHOST_OPS_DEBUG("vhost_set_vring_base failed"); |
d5970055 MT |
890 | return -errno; |
891 | } | |
892 | ||
e5848123 | 893 | if (vhost_needs_vring_endian(vdev)) { |
04b7a152 GK |
894 | r = vhost_virtqueue_set_vring_endian_legacy(dev, |
895 | virtio_is_big_endian(vdev), | |
896 | vhost_vq_index); | |
897 | if (r) { | |
898 | return -errno; | |
899 | } | |
900 | } | |
901 | ||
f1f9e6c5 GK |
902 | vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx); |
903 | vq->desc_phys = a = virtio_queue_get_desc_addr(vdev, idx); | |
c471ad0e | 904 | vq->desc = vhost_memory_map(dev, a, &l, 0); |
d5970055 MT |
905 | if (!vq->desc || l != s) { |
906 | r = -ENOMEM; | |
907 | goto fail_alloc_desc; | |
908 | } | |
f1f9e6c5 GK |
909 | vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx); |
910 | vq->avail_phys = a = virtio_queue_get_avail_addr(vdev, idx); | |
c471ad0e | 911 | vq->avail = vhost_memory_map(dev, a, &l, 0); |
d5970055 MT |
912 | if (!vq->avail || l != s) { |
913 | r = -ENOMEM; | |
914 | goto fail_alloc_avail; | |
915 | } | |
916 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
917 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
c471ad0e | 918 | vq->used = vhost_memory_map(dev, a, &l, 1); |
d5970055 MT |
919 | if (!vq->used || l != s) { |
920 | r = -ENOMEM; | |
921 | goto fail_alloc_used; | |
922 | } | |
923 | ||
a9f98bb5 | 924 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
925 | if (r < 0) { |
926 | r = -errno; | |
927 | goto fail_alloc; | |
928 | } | |
a9f98bb5 | 929 | |
d5970055 | 930 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
21e70425 | 931 | r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); |
d5970055 | 932 | if (r) { |
c6409692 | 933 | VHOST_OPS_DEBUG("vhost_set_vring_kick failed"); |
c8852121 | 934 | r = -errno; |
d5970055 MT |
935 | goto fail_kick; |
936 | } | |
937 | ||
f56a1247 MT |
938 | /* Clear and discard previous events if any. */ |
939 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 | 940 | |
5669655a VK |
941 | /* Init vring in unmasked state, unless guest_notifier_mask |
942 | * will do it later. | |
943 | */ | |
944 | if (!vdev->use_guest_notifier_mask) { | |
945 | /* TODO: check and handle errors. */ | |
946 | vhost_virtqueue_mask(dev, vdev, idx, false); | |
947 | } | |
948 | ||
96a3d98d JW |
949 | if (k->query_guest_notifiers && |
950 | k->query_guest_notifiers(qbus->parent) && | |
951 | virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) { | |
952 | file.fd = -1; | |
953 | r = dev->vhost_ops->vhost_set_vring_call(dev, &file); | |
954 | if (r) { | |
955 | goto fail_vector; | |
956 | } | |
957 | } | |
958 | ||
d5970055 MT |
959 | return 0; |
960 | ||
96a3d98d | 961 | fail_vector: |
d5970055 | 962 | fail_kick: |
d5970055 | 963 | fail_alloc: |
c471ad0e JW |
964 | vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
965 | 0, 0); | |
d5970055 | 966 | fail_alloc_used: |
c471ad0e JW |
967 | vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), |
968 | 0, 0); | |
d5970055 | 969 | fail_alloc_avail: |
c471ad0e JW |
970 | vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), |
971 | 0, 0); | |
d5970055 MT |
972 | fail_alloc_desc: |
973 | return r; | |
974 | } | |
975 | ||
f56a1247 | 976 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
977 | struct VirtIODevice *vdev, |
978 | struct vhost_virtqueue *vq, | |
979 | unsigned idx) | |
980 | { | |
21e70425 | 981 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
d5970055 | 982 | struct vhost_vring_state state = { |
04b7a152 | 983 | .index = vhost_vq_index, |
d5970055 MT |
984 | }; |
985 | int r; | |
fc57fd99 | 986 | |
21e70425 | 987 | r = dev->vhost_ops->vhost_get_vring_base(dev, &state); |
d5970055 | 988 | if (r < 0) { |
c6409692 | 989 | VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r); |
2ae39a11 MC |
990 | /* Connection to the backend is broken, so let's sync internal |
991 | * last avail idx to the device used idx. | |
992 | */ | |
993 | virtio_queue_restore_last_avail_idx(vdev, idx); | |
499c5579 MAL |
994 | } else { |
995 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
d5970055 | 996 | } |
3561ba14 | 997 | virtio_queue_invalidate_signalled_used(vdev, idx); |
aa94d521 | 998 | virtio_queue_update_used_idx(vdev, idx); |
04b7a152 GK |
999 | |
1000 | /* In the cross-endian case, we need to reset the vring endianness to | |
1001 | * native as legacy devices expect so by default. | |
1002 | */ | |
e5848123 | 1003 | if (vhost_needs_vring_endian(vdev)) { |
162bba7f MAL |
1004 | vhost_virtqueue_set_vring_endian_legacy(dev, |
1005 | !virtio_is_big_endian(vdev), | |
1006 | vhost_vq_index); | |
04b7a152 GK |
1007 | } |
1008 | ||
c471ad0e JW |
1009 | vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
1010 | 1, virtio_queue_get_used_size(vdev, idx)); | |
1011 | vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
1012 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
1013 | vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
1014 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
d5970055 MT |
1015 | } |
1016 | ||
80a1ea37 AK |
1017 | static void vhost_eventfd_add(MemoryListener *listener, |
1018 | MemoryRegionSection *section, | |
753d5e14 | 1019 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
1020 | { |
1021 | } | |
1022 | ||
1023 | static void vhost_eventfd_del(MemoryListener *listener, | |
1024 | MemoryRegionSection *section, | |
753d5e14 | 1025 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
1026 | { |
1027 | } | |
1028 | ||
69e87b32 JW |
1029 | static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev, |
1030 | int n, uint32_t timeout) | |
1031 | { | |
1032 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); | |
1033 | struct vhost_vring_state state = { | |
1034 | .index = vhost_vq_index, | |
1035 | .num = timeout, | |
1036 | }; | |
1037 | int r; | |
1038 | ||
1039 | if (!dev->vhost_ops->vhost_set_vring_busyloop_timeout) { | |
1040 | return -EINVAL; | |
1041 | } | |
1042 | ||
1043 | r = dev->vhost_ops->vhost_set_vring_busyloop_timeout(dev, &state); | |
1044 | if (r) { | |
c6409692 | 1045 | VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed"); |
69e87b32 JW |
1046 | return r; |
1047 | } | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
f56a1247 MT |
1052 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
1053 | struct vhost_virtqueue *vq, int n) | |
1054 | { | |
21e70425 | 1055 | int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); |
f56a1247 | 1056 | struct vhost_vring_file file = { |
b931bfbf | 1057 | .index = vhost_vq_index, |
f56a1247 MT |
1058 | }; |
1059 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
1060 | if (r < 0) { | |
1061 | return r; | |
1062 | } | |
1063 | ||
1064 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
21e70425 | 1065 | r = dev->vhost_ops->vhost_set_vring_call(dev, &file); |
f56a1247 | 1066 | if (r) { |
c6409692 | 1067 | VHOST_OPS_DEBUG("vhost_set_vring_call failed"); |
f56a1247 MT |
1068 | r = -errno; |
1069 | goto fail_call; | |
1070 | } | |
c471ad0e JW |
1071 | |
1072 | vq->dev = dev; | |
1073 | ||
f56a1247 MT |
1074 | return 0; |
1075 | fail_call: | |
1076 | event_notifier_cleanup(&vq->masked_notifier); | |
1077 | return r; | |
1078 | } | |
1079 | ||
1080 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
1081 | { | |
1082 | event_notifier_cleanup(&vq->masked_notifier); | |
1083 | } | |
1084 | ||
81647a65 | 1085 | int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
69e87b32 | 1086 | VhostBackendType backend_type, uint32_t busyloop_timeout) |
d5970055 MT |
1087 | { |
1088 | uint64_t features; | |
a06db3ec | 1089 | int i, r, n_initialized_vqs = 0; |
fe44dc91 | 1090 | Error *local_err = NULL; |
81647a65 | 1091 | |
c471ad0e | 1092 | hdev->vdev = NULL; |
d2fc4402 MAL |
1093 | hdev->migration_blocker = NULL; |
1094 | ||
7cb8a9b9 MAL |
1095 | r = vhost_set_backend_type(hdev, backend_type); |
1096 | assert(r >= 0); | |
1a1bfac9 | 1097 | |
7cb8a9b9 MAL |
1098 | r = hdev->vhost_ops->vhost_backend_init(hdev, opaque); |
1099 | if (r < 0) { | |
1100 | goto fail; | |
24d1eb33 NN |
1101 | } |
1102 | ||
aebf8168 | 1103 | if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { |
4afba631 MAL |
1104 | error_report("vhost backend memory slots limit is less" |
1105 | " than current number of present memory slots"); | |
7cb8a9b9 MAL |
1106 | r = -1; |
1107 | goto fail; | |
aebf8168 | 1108 | } |
2ce68e4c | 1109 | |
21e70425 | 1110 | r = hdev->vhost_ops->vhost_set_owner(hdev); |
d5970055 | 1111 | if (r < 0) { |
c6409692 | 1112 | VHOST_OPS_DEBUG("vhost_set_owner failed"); |
d5970055 MT |
1113 | goto fail; |
1114 | } | |
1115 | ||
21e70425 | 1116 | r = hdev->vhost_ops->vhost_get_features(hdev, &features); |
d5970055 | 1117 | if (r < 0) { |
c6409692 | 1118 | VHOST_OPS_DEBUG("vhost_get_features failed"); |
d5970055 MT |
1119 | goto fail; |
1120 | } | |
f56a1247 | 1121 | |
a06db3ec | 1122 | for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) { |
b931bfbf | 1123 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); |
f56a1247 | 1124 | if (r < 0) { |
a06db3ec | 1125 | goto fail; |
f56a1247 MT |
1126 | } |
1127 | } | |
69e87b32 JW |
1128 | |
1129 | if (busyloop_timeout) { | |
1130 | for (i = 0; i < hdev->nvqs; ++i) { | |
1131 | r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, | |
1132 | busyloop_timeout); | |
1133 | if (r < 0) { | |
1134 | goto fail_busyloop; | |
1135 | } | |
1136 | } | |
1137 | } | |
1138 | ||
d5970055 MT |
1139 | hdev->features = features; |
1140 | ||
04097f7c | 1141 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
1142 | .begin = vhost_begin, |
1143 | .commit = vhost_commit, | |
938eeb64 DDAG |
1144 | .region_add = vhost_region_addnop, |
1145 | .region_nop = vhost_region_addnop, | |
04097f7c AK |
1146 | .log_start = vhost_log_start, |
1147 | .log_stop = vhost_log_stop, | |
1148 | .log_sync = vhost_log_sync, | |
1149 | .log_global_start = vhost_log_global_start, | |
1150 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
1151 | .eventfd_add = vhost_eventfd_add, |
1152 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 1153 | .priority = 10 |
04097f7c | 1154 | }; |
d2fc4402 | 1155 | |
375f74f4 JW |
1156 | hdev->iommu_listener = (MemoryListener) { |
1157 | .region_add = vhost_iommu_region_add, | |
1158 | .region_del = vhost_iommu_region_del, | |
1159 | }; | |
c471ad0e | 1160 | |
d2fc4402 MAL |
1161 | if (hdev->migration_blocker == NULL) { |
1162 | if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { | |
1163 | error_setg(&hdev->migration_blocker, | |
1164 | "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); | |
0d34fbab | 1165 | } else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_check()) { |
31190ed7 MAL |
1166 | error_setg(&hdev->migration_blocker, |
1167 | "Migration disabled: failed to allocate shared memory"); | |
d2fc4402 MAL |
1168 | } |
1169 | } | |
1170 | ||
1171 | if (hdev->migration_blocker != NULL) { | |
fe44dc91 AA |
1172 | r = migrate_add_blocker(hdev->migration_blocker, &local_err); |
1173 | if (local_err) { | |
1174 | error_report_err(local_err); | |
1175 | error_free(hdev->migration_blocker); | |
1176 | goto fail_busyloop; | |
1177 | } | |
7145872e | 1178 | } |
d2fc4402 | 1179 | |
7267c094 | 1180 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
1181 | hdev->n_mem_sections = 0; |
1182 | hdev->mem_sections = NULL; | |
d5970055 MT |
1183 | hdev->log = NULL; |
1184 | hdev->log_size = 0; | |
1185 | hdev->log_enabled = false; | |
1186 | hdev->started = false; | |
f6790af6 | 1187 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
5be5f9be | 1188 | QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); |
d5970055 | 1189 | return 0; |
a06db3ec | 1190 | |
69e87b32 JW |
1191 | fail_busyloop: |
1192 | while (--i >= 0) { | |
1193 | vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0); | |
1194 | } | |
d5970055 | 1195 | fail: |
a06db3ec MAL |
1196 | hdev->nvqs = n_initialized_vqs; |
1197 | vhost_dev_cleanup(hdev); | |
d5970055 MT |
1198 | return r; |
1199 | } | |
1200 | ||
1201 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
1202 | { | |
f56a1247 | 1203 | int i; |
e0547b59 | 1204 | |
f56a1247 MT |
1205 | for (i = 0; i < hdev->nvqs; ++i) { |
1206 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
1207 | } | |
5be5f9be MAL |
1208 | if (hdev->mem) { |
1209 | /* those are only safe after successful init */ | |
1210 | memory_listener_unregister(&hdev->memory_listener); | |
1211 | QLIST_REMOVE(hdev, entry); | |
1212 | } | |
7145872e MT |
1213 | if (hdev->migration_blocker) { |
1214 | migrate_del_blocker(hdev->migration_blocker); | |
1215 | error_free(hdev->migration_blocker); | |
1216 | } | |
7267c094 | 1217 | g_free(hdev->mem); |
2817b260 | 1218 | g_free(hdev->mem_sections); |
e0547b59 MAL |
1219 | if (hdev->vhost_ops) { |
1220 | hdev->vhost_ops->vhost_backend_cleanup(hdev); | |
1221 | } | |
7b527247 | 1222 | assert(!hdev->log); |
e0547b59 MAL |
1223 | |
1224 | memset(hdev, 0, sizeof(struct vhost_dev)); | |
d5970055 MT |
1225 | } |
1226 | ||
b0b3db79 MT |
1227 | /* Stop processing guest IO notifications in qemu. |
1228 | * Start processing them in vhost in kernel. | |
1229 | */ | |
1230 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1231 | { | |
1c819449 | 1232 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
16617e36 | 1233 | int i, r, e; |
4afba631 | 1234 | |
310837de PB |
1235 | /* We will pass the notifiers to the kernel, make sure that QEMU |
1236 | * doesn't interfere. | |
1237 | */ | |
1238 | r = virtio_device_grab_ioeventfd(vdev); | |
1239 | if (r < 0) { | |
4afba631 | 1240 | error_report("binding does not support host notifiers"); |
b0b3db79 MT |
1241 | goto fail; |
1242 | } | |
1243 | ||
1244 | for (i = 0; i < hdev->nvqs; ++i) { | |
b1f0a33d CH |
1245 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1246 | true); | |
b0b3db79 | 1247 | if (r < 0) { |
4afba631 | 1248 | error_report("vhost VQ %d notifier binding failed: %d", i, -r); |
b0b3db79 MT |
1249 | goto fail_vq; |
1250 | } | |
1251 | } | |
1252 | ||
1253 | return 0; | |
1254 | fail_vq: | |
1255 | while (--i >= 0) { | |
b1f0a33d CH |
1256 | e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1257 | false); | |
16617e36 | 1258 | if (e < 0) { |
4afba631 | 1259 | error_report("vhost VQ %d notifier cleanup error: %d", i, -r); |
b0b3db79 | 1260 | } |
16617e36 | 1261 | assert (e >= 0); |
76143618 | 1262 | virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); |
b0b3db79 | 1263 | } |
310837de | 1264 | virtio_device_release_ioeventfd(vdev); |
b0b3db79 MT |
1265 | fail: |
1266 | return r; | |
1267 | } | |
1268 | ||
1269 | /* Stop processing guest IO notifications in vhost. | |
1270 | * Start processing them in qemu. | |
1271 | * This might actually run the qemu handlers right away, | |
1272 | * so virtio in qemu must be completely setup when this is called. | |
1273 | */ | |
1274 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1275 | { | |
1c819449 | 1276 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
b0b3db79 MT |
1277 | int i, r; |
1278 | ||
1279 | for (i = 0; i < hdev->nvqs; ++i) { | |
b1f0a33d CH |
1280 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
1281 | false); | |
b0b3db79 | 1282 | if (r < 0) { |
4afba631 | 1283 | error_report("vhost VQ %d notifier cleanup failed: %d", i, -r); |
b0b3db79 MT |
1284 | } |
1285 | assert (r >= 0); | |
76143618 | 1286 | virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); |
b0b3db79 | 1287 | } |
310837de | 1288 | virtio_device_release_ioeventfd(vdev); |
b0b3db79 MT |
1289 | } |
1290 | ||
f56a1247 MT |
1291 | /* Test and clear event pending status. |
1292 | * Should be called after unmask to avoid losing events. | |
1293 | */ | |
1294 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
1295 | { | |
a9f98bb5 | 1296 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
a9f98bb5 | 1297 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
1298 | return event_notifier_test_and_clear(&vq->masked_notifier); |
1299 | } | |
1300 | ||
1301 | /* Mask/unmask events from this vq. */ | |
1302 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
1303 | bool mask) | |
1304 | { | |
1305 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 1306 | int r, index = n - hdev->vq_index; |
fc57fd99 | 1307 | struct vhost_vring_file file; |
f56a1247 | 1308 | |
8695de0f MAL |
1309 | /* should only be called after backend is connected */ |
1310 | assert(hdev->vhost_ops); | |
1311 | ||
f56a1247 | 1312 | if (mask) { |
5669655a | 1313 | assert(vdev->use_guest_notifier_mask); |
a9f98bb5 | 1314 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
1315 | } else { |
1316 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
1317 | } | |
fc57fd99 | 1318 | |
21e70425 MAL |
1319 | file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n); |
1320 | r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file); | |
162bba7f MAL |
1321 | if (r < 0) { |
1322 | VHOST_OPS_DEBUG("vhost_set_vring_call failed"); | |
1323 | } | |
f56a1247 MT |
1324 | } |
1325 | ||
9a2ba823 CH |
1326 | uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
1327 | uint64_t features) | |
2e6d46d7 NN |
1328 | { |
1329 | const int *bit = feature_bits; | |
1330 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1331 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1332 | if (!(hdev->features & bit_mask)) { |
1333 | features &= ~bit_mask; | |
1334 | } | |
1335 | bit++; | |
1336 | } | |
1337 | return features; | |
1338 | } | |
1339 | ||
1340 | void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, | |
9a2ba823 | 1341 | uint64_t features) |
2e6d46d7 NN |
1342 | { |
1343 | const int *bit = feature_bits; | |
1344 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1345 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1346 | if (features & bit_mask) { |
1347 | hdev->acked_features |= bit_mask; | |
1348 | } | |
1349 | bit++; | |
1350 | } | |
1351 | } | |
1352 | ||
4c3e257b CL |
1353 | int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, |
1354 | uint32_t config_len) | |
1355 | { | |
1356 | assert(hdev->vhost_ops); | |
1357 | ||
1358 | if (hdev->vhost_ops->vhost_get_config) { | |
1359 | return hdev->vhost_ops->vhost_get_config(hdev, config, config_len); | |
1360 | } | |
1361 | ||
1362 | return -1; | |
1363 | } | |
1364 | ||
1365 | int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data, | |
1366 | uint32_t offset, uint32_t size, uint32_t flags) | |
1367 | { | |
1368 | assert(hdev->vhost_ops); | |
1369 | ||
1370 | if (hdev->vhost_ops->vhost_set_config) { | |
1371 | return hdev->vhost_ops->vhost_set_config(hdev, data, offset, | |
1372 | size, flags); | |
1373 | } | |
1374 | ||
1375 | return -1; | |
1376 | } | |
1377 | ||
1378 | void vhost_dev_set_config_notifier(struct vhost_dev *hdev, | |
1379 | const VhostDevConfigOps *ops) | |
1380 | { | |
1381 | assert(hdev->vhost_ops); | |
1382 | hdev->config_ops = ops; | |
1383 | } | |
1384 | ||
b0b3db79 | 1385 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1386 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1387 | { | |
1388 | int i, r; | |
24f4fe34 | 1389 | |
8695de0f MAL |
1390 | /* should only be called after backend is connected */ |
1391 | assert(hdev->vhost_ops); | |
1392 | ||
24f4fe34 | 1393 | hdev->started = true; |
c471ad0e | 1394 | hdev->vdev = vdev; |
24f4fe34 | 1395 | |
d5970055 MT |
1396 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1397 | if (r < 0) { | |
54dd9321 | 1398 | goto fail_features; |
d5970055 | 1399 | } |
c471ad0e JW |
1400 | |
1401 | if (vhost_dev_has_iommu(hdev)) { | |
375f74f4 | 1402 | memory_listener_register(&hdev->iommu_listener, vdev->dma_as); |
c471ad0e JW |
1403 | } |
1404 | ||
21e70425 | 1405 | r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem); |
d5970055 | 1406 | if (r < 0) { |
c6409692 | 1407 | VHOST_OPS_DEBUG("vhost_set_mem_table failed"); |
d5970055 | 1408 | r = -errno; |
54dd9321 | 1409 | goto fail_mem; |
d5970055 | 1410 | } |
d154e0ba | 1411 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1412 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1413 | vdev, |
1414 | hdev->vqs + i, | |
1415 | hdev->vq_index + i); | |
d154e0ba MT |
1416 | if (r < 0) { |
1417 | goto fail_vq; | |
1418 | } | |
1419 | } | |
1420 | ||
d5970055 | 1421 | if (hdev->log_enabled) { |
e05ca820 MT |
1422 | uint64_t log_base; |
1423 | ||
d5970055 | 1424 | hdev->log_size = vhost_get_log_size(hdev); |
15324404 MAL |
1425 | hdev->log = vhost_log_get(hdev->log_size, |
1426 | vhost_dev_log_is_shared(hdev)); | |
309750fa | 1427 | log_base = (uintptr_t)hdev->log->log; |
c2bea314 | 1428 | r = hdev->vhost_ops->vhost_set_log_base(hdev, |
9a78a5dd MAL |
1429 | hdev->log_size ? log_base : 0, |
1430 | hdev->log); | |
d5970055 | 1431 | if (r < 0) { |
c6409692 | 1432 | VHOST_OPS_DEBUG("vhost_set_log_base failed"); |
d5970055 | 1433 | r = -errno; |
54dd9321 | 1434 | goto fail_log; |
d5970055 MT |
1435 | } |
1436 | } | |
d154e0ba | 1437 | |
c471ad0e JW |
1438 | if (vhost_dev_has_iommu(hdev)) { |
1439 | hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true); | |
1440 | ||
1441 | /* Update used ring information for IOTLB to work correctly, | |
1442 | * vhost-kernel code requires for this.*/ | |
1443 | for (i = 0; i < hdev->nvqs; ++i) { | |
1444 | struct vhost_virtqueue *vq = hdev->vqs + i; | |
1445 | vhost_device_iotlb_miss(hdev, vq->used_phys, true); | |
1446 | } | |
1447 | } | |
d5970055 | 1448 | return 0; |
54dd9321 | 1449 | fail_log: |
24bfa207 | 1450 | vhost_log_put(hdev, false); |
d5970055 MT |
1451 | fail_vq: |
1452 | while (--i >= 0) { | |
f56a1247 | 1453 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1454 | vdev, |
1455 | hdev->vqs + i, | |
1456 | hdev->vq_index + i); | |
d5970055 | 1457 | } |
a9f98bb5 | 1458 | i = hdev->nvqs; |
c471ad0e | 1459 | |
54dd9321 MT |
1460 | fail_mem: |
1461 | fail_features: | |
24f4fe34 MT |
1462 | |
1463 | hdev->started = false; | |
d5970055 MT |
1464 | return r; |
1465 | } | |
1466 | ||
b0b3db79 | 1467 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1468 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1469 | { | |
a9f98bb5 | 1470 | int i; |
54dd9321 | 1471 | |
8695de0f MAL |
1472 | /* should only be called after backend is connected */ |
1473 | assert(hdev->vhost_ops); | |
1474 | ||
d5970055 | 1475 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1476 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1477 | vdev, |
1478 | hdev->vqs + i, | |
1479 | hdev->vq_index + i); | |
d5970055 | 1480 | } |
54dd9321 | 1481 | |
c471ad0e JW |
1482 | if (vhost_dev_has_iommu(hdev)) { |
1483 | hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false); | |
375f74f4 | 1484 | memory_listener_unregister(&hdev->iommu_listener); |
c471ad0e | 1485 | } |
309750fa | 1486 | vhost_log_put(hdev, true); |
d5970055 | 1487 | hdev->started = false; |
c471ad0e | 1488 | hdev->vdev = NULL; |
d5970055 | 1489 | } |
950d94ba MAL |
1490 | |
1491 | int vhost_net_set_backend(struct vhost_dev *hdev, | |
1492 | struct vhost_vring_file *file) | |
1493 | { | |
1494 | if (hdev->vhost_ops->vhost_net_set_backend) { | |
1495 | return hdev->vhost_ops->vhost_net_set_backend(hdev, file); | |
1496 | } | |
1497 | ||
1498 | return -1; | |
1499 | } |