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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 | ||
0d09e41a | 16 | #include "hw/virtio/vhost.h" |
d5970055 | 17 | #include "hw/hw.h" |
5444e768 | 18 | #include "qemu/atomic.h" |
1de7afc9 | 19 | #include "qemu/range.h" |
04b7a152 | 20 | #include "qemu/error-report.h" |
11078ae3 | 21 | #include <linux/vhost.h> |
022c62cb | 22 | #include "exec/address-spaces.h" |
1c819449 | 23 | #include "hw/virtio/virtio-bus.h" |
04b7a152 | 24 | #include "hw/virtio/virtio-access.h" |
7145872e | 25 | #include "migration/migration.h" |
d5970055 | 26 | |
309750fa JW |
27 | static struct vhost_log *vhost_log; |
28 | ||
2ce68e4c IM |
29 | static unsigned int used_memslots; |
30 | static QLIST_HEAD(, vhost_dev) vhost_devices = | |
31 | QLIST_HEAD_INITIALIZER(vhost_devices); | |
32 | ||
33 | bool vhost_has_free_slot(void) | |
34 | { | |
35 | unsigned int slots_limit = ~0U; | |
36 | struct vhost_dev *hdev; | |
37 | ||
38 | QLIST_FOREACH(hdev, &vhost_devices, entry) { | |
39 | unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); | |
40 | slots_limit = MIN(slots_limit, r); | |
41 | } | |
42 | return slots_limit > used_memslots; | |
43 | } | |
44 | ||
d5970055 | 45 | static void vhost_dev_sync_region(struct vhost_dev *dev, |
2817b260 | 46 | MemoryRegionSection *section, |
d5970055 MT |
47 | uint64_t mfirst, uint64_t mlast, |
48 | uint64_t rfirst, uint64_t rlast) | |
49 | { | |
309750fa JW |
50 | vhost_log_chunk_t *log = dev->log->log; |
51 | ||
d5970055 MT |
52 | uint64_t start = MAX(mfirst, rfirst); |
53 | uint64_t end = MIN(mlast, rlast); | |
309750fa JW |
54 | vhost_log_chunk_t *from = log + start / VHOST_LOG_CHUNK; |
55 | vhost_log_chunk_t *to = log + end / VHOST_LOG_CHUNK + 1; | |
d5970055 MT |
56 | uint64_t addr = (start / VHOST_LOG_CHUNK) * VHOST_LOG_CHUNK; |
57 | ||
d5970055 MT |
58 | if (end < start) { |
59 | return; | |
60 | } | |
e314672a | 61 | assert(end / VHOST_LOG_CHUNK < dev->log_size); |
fbbaf9ae | 62 | assert(start / VHOST_LOG_CHUNK < dev->log_size); |
e314672a | 63 | |
d5970055 MT |
64 | for (;from < to; ++from) { |
65 | vhost_log_chunk_t log; | |
d5970055 MT |
66 | /* We first check with non-atomic: much cheaper, |
67 | * and we expect non-dirty to be the common case. */ | |
68 | if (!*from) { | |
0c600ce2 | 69 | addr += VHOST_LOG_CHUNK; |
d5970055 MT |
70 | continue; |
71 | } | |
5444e768 PB |
72 | /* Data must be read atomically. We don't really need barrier semantics |
73 | * but it's easier to use atomic_* than roll our own. */ | |
74 | log = atomic_xchg(from, 0); | |
747eb78b NC |
75 | while (log) { |
76 | int bit = ctzl(log); | |
6b37a23d MT |
77 | hwaddr page_addr; |
78 | hwaddr section_offset; | |
79 | hwaddr mr_offset; | |
6b37a23d MT |
80 | page_addr = addr + bit * VHOST_LOG_PAGE; |
81 | section_offset = page_addr - section->offset_within_address_space; | |
82 | mr_offset = section_offset + section->offset_within_region; | |
83 | memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); | |
d5970055 MT |
84 | log &= ~(0x1ull << bit); |
85 | } | |
86 | addr += VHOST_LOG_CHUNK; | |
87 | } | |
88 | } | |
89 | ||
04097f7c | 90 | static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
2817b260 | 91 | MemoryRegionSection *section, |
6b37a23d MT |
92 | hwaddr first, |
93 | hwaddr last) | |
d5970055 | 94 | { |
d5970055 | 95 | int i; |
6b37a23d MT |
96 | hwaddr start_addr; |
97 | hwaddr end_addr; | |
04097f7c | 98 | |
d5970055 MT |
99 | if (!dev->log_enabled || !dev->started) { |
100 | return 0; | |
101 | } | |
6b37a23d | 102 | start_addr = section->offset_within_address_space; |
052e87b0 | 103 | end_addr = range_get_last(start_addr, int128_get64(section->size)); |
6b37a23d MT |
104 | start_addr = MAX(first, start_addr); |
105 | end_addr = MIN(last, end_addr); | |
106 | ||
d5970055 MT |
107 | for (i = 0; i < dev->mem->nregions; ++i) { |
108 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
2817b260 | 109 | vhost_dev_sync_region(dev, section, start_addr, end_addr, |
d5970055 MT |
110 | reg->guest_phys_addr, |
111 | range_get_last(reg->guest_phys_addr, | |
112 | reg->memory_size)); | |
113 | } | |
114 | for (i = 0; i < dev->nvqs; ++i) { | |
115 | struct vhost_virtqueue *vq = dev->vqs + i; | |
2817b260 | 116 | vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
d5970055 MT |
117 | range_get_last(vq->used_phys, vq->used_size)); |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
04097f7c AK |
122 | static void vhost_log_sync(MemoryListener *listener, |
123 | MemoryRegionSection *section) | |
124 | { | |
125 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
126 | memory_listener); | |
6b37a23d MT |
127 | vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
128 | } | |
04097f7c | 129 | |
6b37a23d MT |
130 | static void vhost_log_sync_range(struct vhost_dev *dev, |
131 | hwaddr first, hwaddr last) | |
132 | { | |
133 | int i; | |
134 | /* FIXME: this is N^2 in number of sections */ | |
135 | for (i = 0; i < dev->n_mem_sections; ++i) { | |
136 | MemoryRegionSection *section = &dev->mem_sections[i]; | |
137 | vhost_sync_dirty_bitmap(dev, section, first, last); | |
138 | } | |
04097f7c AK |
139 | } |
140 | ||
d5970055 MT |
141 | /* Assign/unassign. Keep an unsorted array of non-overlapping |
142 | * memory regions in dev->mem. */ | |
143 | static void vhost_dev_unassign_memory(struct vhost_dev *dev, | |
144 | uint64_t start_addr, | |
145 | uint64_t size) | |
146 | { | |
147 | int from, to, n = dev->mem->nregions; | |
148 | /* Track overlapping/split regions for sanity checking. */ | |
149 | int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0; | |
150 | ||
151 | for (from = 0, to = 0; from < n; ++from, ++to) { | |
152 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
153 | uint64_t reglast; | |
154 | uint64_t memlast; | |
155 | uint64_t change; | |
156 | ||
157 | /* clone old region */ | |
158 | if (to != from) { | |
159 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
160 | } | |
161 | ||
162 | /* No overlap is simple */ | |
163 | if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
164 | start_addr, size)) { | |
165 | continue; | |
166 | } | |
167 | ||
168 | /* Split only happens if supplied region | |
169 | * is in the middle of an existing one. Thus it can not | |
170 | * overlap with any other existing region. */ | |
171 | assert(!split); | |
172 | ||
173 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
174 | memlast = range_get_last(start_addr, size); | |
175 | ||
176 | /* Remove whole region */ | |
177 | if (start_addr <= reg->guest_phys_addr && memlast >= reglast) { | |
178 | --dev->mem->nregions; | |
179 | --to; | |
d5970055 MT |
180 | ++overlap_middle; |
181 | continue; | |
182 | } | |
183 | ||
184 | /* Shrink region */ | |
185 | if (memlast >= reglast) { | |
186 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
187 | assert(reg->memory_size); | |
188 | assert(!overlap_end); | |
189 | ++overlap_end; | |
190 | continue; | |
191 | } | |
192 | ||
193 | /* Shift region */ | |
194 | if (start_addr <= reg->guest_phys_addr) { | |
195 | change = memlast + 1 - reg->guest_phys_addr; | |
196 | reg->memory_size -= change; | |
197 | reg->guest_phys_addr += change; | |
198 | reg->userspace_addr += change; | |
199 | assert(reg->memory_size); | |
200 | assert(!overlap_start); | |
201 | ++overlap_start; | |
202 | continue; | |
203 | } | |
204 | ||
205 | /* This only happens if supplied region | |
206 | * is in the middle of an existing one. Thus it can not | |
207 | * overlap with any other existing region. */ | |
208 | assert(!overlap_start); | |
209 | assert(!overlap_end); | |
210 | assert(!overlap_middle); | |
211 | /* Split region: shrink first part, shift second part. */ | |
212 | memcpy(dev->mem->regions + n, reg, sizeof *reg); | |
213 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
214 | assert(reg->memory_size); | |
215 | change = memlast + 1 - reg->guest_phys_addr; | |
216 | reg = dev->mem->regions + n; | |
217 | reg->memory_size -= change; | |
218 | assert(reg->memory_size); | |
219 | reg->guest_phys_addr += change; | |
220 | reg->userspace_addr += change; | |
221 | /* Never add more than 1 region */ | |
222 | assert(dev->mem->nregions == n); | |
223 | ++dev->mem->nregions; | |
224 | ++split; | |
225 | } | |
226 | } | |
227 | ||
228 | /* Called after unassign, so no regions overlap the given range. */ | |
229 | static void vhost_dev_assign_memory(struct vhost_dev *dev, | |
230 | uint64_t start_addr, | |
231 | uint64_t size, | |
232 | uint64_t uaddr) | |
233 | { | |
234 | int from, to; | |
235 | struct vhost_memory_region *merged = NULL; | |
236 | for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) { | |
237 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
238 | uint64_t prlast, urlast; | |
239 | uint64_t pmlast, umlast; | |
240 | uint64_t s, e, u; | |
241 | ||
242 | /* clone old region */ | |
243 | if (to != from) { | |
244 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
245 | } | |
246 | prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
247 | pmlast = range_get_last(start_addr, size); | |
248 | urlast = range_get_last(reg->userspace_addr, reg->memory_size); | |
249 | umlast = range_get_last(uaddr, size); | |
250 | ||
251 | /* check for overlapping regions: should never happen. */ | |
252 | assert(prlast < start_addr || pmlast < reg->guest_phys_addr); | |
253 | /* Not an adjacent or overlapping region - do not merge. */ | |
254 | if ((prlast + 1 != start_addr || urlast + 1 != uaddr) && | |
255 | (pmlast + 1 != reg->guest_phys_addr || | |
256 | umlast + 1 != reg->userspace_addr)) { | |
257 | continue; | |
258 | } | |
259 | ||
260 | if (merged) { | |
261 | --to; | |
262 | assert(to >= 0); | |
263 | } else { | |
264 | merged = reg; | |
265 | } | |
266 | u = MIN(uaddr, reg->userspace_addr); | |
267 | s = MIN(start_addr, reg->guest_phys_addr); | |
268 | e = MAX(pmlast, prlast); | |
269 | uaddr = merged->userspace_addr = u; | |
270 | start_addr = merged->guest_phys_addr = s; | |
271 | size = merged->memory_size = e - s + 1; | |
272 | assert(merged->memory_size); | |
273 | } | |
274 | ||
275 | if (!merged) { | |
276 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
277 | memset(reg, 0, sizeof *reg); | |
278 | reg->memory_size = size; | |
279 | assert(reg->memory_size); | |
280 | reg->guest_phys_addr = start_addr; | |
281 | reg->userspace_addr = uaddr; | |
282 | ++to; | |
283 | } | |
284 | assert(to <= dev->mem->nregions + 1); | |
285 | dev->mem->nregions = to; | |
286 | } | |
287 | ||
288 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) | |
289 | { | |
290 | uint64_t log_size = 0; | |
291 | int i; | |
292 | for (i = 0; i < dev->mem->nregions; ++i) { | |
293 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
294 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
295 | reg->memory_size); | |
296 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
297 | } | |
298 | for (i = 0; i < dev->nvqs; ++i) { | |
299 | struct vhost_virtqueue *vq = dev->vqs + i; | |
300 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
301 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
302 | } | |
303 | return log_size; | |
304 | } | |
309750fa JW |
305 | static struct vhost_log *vhost_log_alloc(uint64_t size) |
306 | { | |
307 | struct vhost_log *log = g_malloc0(sizeof *log + size * sizeof(*(log->log))); | |
308 | ||
309 | log->size = size; | |
310 | log->refcnt = 1; | |
311 | ||
312 | return log; | |
313 | } | |
314 | ||
315 | static struct vhost_log *vhost_log_get(uint64_t size) | |
316 | { | |
317 | if (!vhost_log || vhost_log->size != size) { | |
318 | vhost_log = vhost_log_alloc(size); | |
319 | } else { | |
320 | ++vhost_log->refcnt; | |
321 | } | |
322 | ||
323 | return vhost_log; | |
324 | } | |
325 | ||
326 | static void vhost_log_put(struct vhost_dev *dev, bool sync) | |
327 | { | |
328 | struct vhost_log *log = dev->log; | |
329 | ||
330 | if (!log) { | |
331 | return; | |
332 | } | |
333 | ||
334 | --log->refcnt; | |
335 | if (log->refcnt == 0) { | |
336 | /* Sync only the range covered by the old log */ | |
337 | if (dev->log_size && sync) { | |
338 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
339 | } | |
340 | if (vhost_log == log) { | |
341 | vhost_log = NULL; | |
342 | } | |
343 | g_free(log); | |
344 | } | |
345 | } | |
d5970055 MT |
346 | |
347 | static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size) | |
348 | { | |
309750fa JW |
349 | struct vhost_log *log = vhost_log_get(size); |
350 | uint64_t log_base = (uintptr_t)log->log; | |
6b37a23d | 351 | int r; |
6528499f | 352 | |
24d1eb33 | 353 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_LOG_BASE, &log_base); |
d5970055 | 354 | assert(r >= 0); |
309750fa | 355 | vhost_log_put(dev, true); |
d5970055 MT |
356 | dev->log = log; |
357 | dev->log_size = size; | |
358 | } | |
359 | ||
360 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, | |
361 | uint64_t start_addr, | |
362 | uint64_t size) | |
363 | { | |
364 | int i; | |
8617343f MT |
365 | int r = 0; |
366 | ||
367 | for (i = 0; !r && i < dev->nvqs; ++i) { | |
d5970055 | 368 | struct vhost_virtqueue *vq = dev->vqs + i; |
a8170e5e | 369 | hwaddr l; |
d5970055 MT |
370 | void *p; |
371 | ||
372 | if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) { | |
373 | continue; | |
374 | } | |
375 | l = vq->ring_size; | |
376 | p = cpu_physical_memory_map(vq->ring_phys, &l, 1); | |
377 | if (!p || l != vq->ring_size) { | |
378 | fprintf(stderr, "Unable to map ring buffer for ring %d\n", i); | |
8617343f | 379 | r = -ENOMEM; |
d5970055 MT |
380 | } |
381 | if (p != vq->ring) { | |
382 | fprintf(stderr, "Ring buffer relocated for ring %d\n", i); | |
8617343f | 383 | r = -EBUSY; |
d5970055 MT |
384 | } |
385 | cpu_physical_memory_unmap(p, l, 0, 0); | |
386 | } | |
8617343f | 387 | return r; |
d5970055 MT |
388 | } |
389 | ||
4e789564 MT |
390 | static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
391 | uint64_t start_addr, | |
392 | uint64_t size) | |
393 | { | |
394 | int i, n = dev->mem->nregions; | |
395 | for (i = 0; i < n; ++i) { | |
396 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
397 | if (ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
398 | start_addr, size)) { | |
399 | return reg; | |
400 | } | |
401 | } | |
402 | return NULL; | |
403 | } | |
404 | ||
405 | static bool vhost_dev_cmp_memory(struct vhost_dev *dev, | |
406 | uint64_t start_addr, | |
407 | uint64_t size, | |
408 | uint64_t uaddr) | |
409 | { | |
410 | struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size); | |
411 | uint64_t reglast; | |
412 | uint64_t memlast; | |
413 | ||
414 | if (!reg) { | |
415 | return true; | |
416 | } | |
417 | ||
418 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
419 | memlast = range_get_last(start_addr, size); | |
420 | ||
421 | /* Need to extend region? */ | |
422 | if (start_addr < reg->guest_phys_addr || memlast > reglast) { | |
423 | return true; | |
424 | } | |
425 | /* userspace_addr changed? */ | |
426 | return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr; | |
427 | } | |
428 | ||
04097f7c AK |
429 | static void vhost_set_memory(MemoryListener *listener, |
430 | MemoryRegionSection *section, | |
431 | bool add) | |
d5970055 | 432 | { |
04097f7c AK |
433 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
434 | memory_listener); | |
a8170e5e | 435 | hwaddr start_addr = section->offset_within_address_space; |
052e87b0 | 436 | ram_addr_t size = int128_get64(section->size); |
2d1a35be PB |
437 | bool log_dirty = |
438 | memory_region_get_dirty_log_mask(section->mr) & ~(1 << DIRTY_MEMORY_MIGRATION); | |
d5970055 MT |
439 | int s = offsetof(struct vhost_memory, regions) + |
440 | (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; | |
04097f7c AK |
441 | void *ram; |
442 | ||
7267c094 | 443 | dev->mem = g_realloc(dev->mem, s); |
d5970055 | 444 | |
f5a4e64f | 445 | if (log_dirty) { |
04097f7c | 446 | add = false; |
f5a4e64f MT |
447 | } |
448 | ||
d5970055 MT |
449 | assert(size); |
450 | ||
4e789564 | 451 | /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */ |
d743c382 | 452 | ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
04097f7c AK |
453 | if (add) { |
454 | if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) { | |
4e789564 MT |
455 | /* Region exists with same address. Nothing to do. */ |
456 | return; | |
457 | } | |
458 | } else { | |
459 | if (!vhost_dev_find_reg(dev, start_addr, size)) { | |
460 | /* Removing region that we don't access. Nothing to do. */ | |
461 | return; | |
462 | } | |
463 | } | |
464 | ||
d5970055 | 465 | vhost_dev_unassign_memory(dev, start_addr, size); |
04097f7c | 466 | if (add) { |
d5970055 | 467 | /* Add given mapping, merging adjacent regions if any */ |
04097f7c | 468 | vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
d5970055 MT |
469 | } else { |
470 | /* Remove old mapping for this memory, if any. */ | |
471 | vhost_dev_unassign_memory(dev, start_addr, size); | |
472 | } | |
af603142 NB |
473 | dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); |
474 | dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); | |
475 | dev->memory_changed = true; | |
2ce68e4c | 476 | used_memslots = dev->mem->nregions; |
af603142 NB |
477 | } |
478 | ||
479 | static bool vhost_section(MemoryRegionSection *section) | |
480 | { | |
481 | return memory_region_is_ram(section->mr); | |
482 | } | |
483 | ||
484 | static void vhost_begin(MemoryListener *listener) | |
485 | { | |
486 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
487 | memory_listener); | |
488 | dev->mem_changed_end_addr = 0; | |
489 | dev->mem_changed_start_addr = -1; | |
490 | } | |
d5970055 | 491 | |
af603142 NB |
492 | static void vhost_commit(MemoryListener *listener) |
493 | { | |
494 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
495 | memory_listener); | |
496 | hwaddr start_addr = 0; | |
497 | ram_addr_t size = 0; | |
498 | uint64_t log_size; | |
499 | int r; | |
500 | ||
501 | if (!dev->memory_changed) { | |
502 | return; | |
503 | } | |
d5970055 MT |
504 | if (!dev->started) { |
505 | return; | |
506 | } | |
af603142 NB |
507 | if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { |
508 | return; | |
509 | } | |
d5970055 MT |
510 | |
511 | if (dev->started) { | |
af603142 NB |
512 | start_addr = dev->mem_changed_start_addr; |
513 | size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; | |
514 | ||
d5970055 MT |
515 | r = vhost_verify_ring_mappings(dev, start_addr, size); |
516 | assert(r >= 0); | |
517 | } | |
518 | ||
519 | if (!dev->log_enabled) { | |
24d1eb33 | 520 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_MEM_TABLE, dev->mem); |
d5970055 | 521 | assert(r >= 0); |
af603142 | 522 | dev->memory_changed = false; |
d5970055 MT |
523 | return; |
524 | } | |
525 | log_size = vhost_get_log_size(dev); | |
526 | /* We allocate an extra 4K bytes to log, | |
527 | * to reduce the * number of reallocations. */ | |
528 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
529 | /* To log more, must increase log size before table update. */ | |
530 | if (dev->log_size < log_size) { | |
531 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
532 | } | |
24d1eb33 | 533 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_MEM_TABLE, dev->mem); |
d5970055 MT |
534 | assert(r >= 0); |
535 | /* To log less, can only decrease log size after table update. */ | |
536 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
537 | vhost_dev_log_resize(dev, log_size); | |
538 | } | |
af603142 | 539 | dev->memory_changed = false; |
50c1e149 AK |
540 | } |
541 | ||
04097f7c AK |
542 | static void vhost_region_add(MemoryListener *listener, |
543 | MemoryRegionSection *section) | |
544 | { | |
2817b260 AK |
545 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
546 | memory_listener); | |
547 | ||
c49450b9 AK |
548 | if (!vhost_section(section)) { |
549 | return; | |
550 | } | |
551 | ||
2817b260 AK |
552 | ++dev->n_mem_sections; |
553 | dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, | |
554 | dev->n_mem_sections); | |
555 | dev->mem_sections[dev->n_mem_sections - 1] = *section; | |
dfde4e6e | 556 | memory_region_ref(section->mr); |
04097f7c AK |
557 | vhost_set_memory(listener, section, true); |
558 | } | |
559 | ||
560 | static void vhost_region_del(MemoryListener *listener, | |
561 | MemoryRegionSection *section) | |
562 | { | |
2817b260 AK |
563 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
564 | memory_listener); | |
565 | int i; | |
566 | ||
c49450b9 AK |
567 | if (!vhost_section(section)) { |
568 | return; | |
569 | } | |
570 | ||
04097f7c | 571 | vhost_set_memory(listener, section, false); |
dfde4e6e | 572 | memory_region_unref(section->mr); |
2817b260 AK |
573 | for (i = 0; i < dev->n_mem_sections; ++i) { |
574 | if (dev->mem_sections[i].offset_within_address_space | |
575 | == section->offset_within_address_space) { | |
576 | --dev->n_mem_sections; | |
577 | memmove(&dev->mem_sections[i], &dev->mem_sections[i+1], | |
637f7a6a | 578 | (dev->n_mem_sections - i) * sizeof(*dev->mem_sections)); |
2817b260 AK |
579 | break; |
580 | } | |
581 | } | |
04097f7c AK |
582 | } |
583 | ||
50c1e149 AK |
584 | static void vhost_region_nop(MemoryListener *listener, |
585 | MemoryRegionSection *section) | |
586 | { | |
587 | } | |
588 | ||
d5970055 MT |
589 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
590 | struct vhost_virtqueue *vq, | |
591 | unsigned idx, bool enable_log) | |
592 | { | |
593 | struct vhost_vring_addr addr = { | |
594 | .index = idx, | |
2b3af999 SW |
595 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
596 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
597 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
598 | .log_guest_addr = vq->used_phys, |
599 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
600 | }; | |
24d1eb33 | 601 | int r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_ADDR, &addr); |
d5970055 MT |
602 | if (r < 0) { |
603 | return -errno; | |
604 | } | |
605 | return 0; | |
606 | } | |
607 | ||
608 | static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) | |
609 | { | |
610 | uint64_t features = dev->acked_features; | |
611 | int r; | |
612 | if (enable_log) { | |
9a2ba823 | 613 | features |= 0x1ULL << VHOST_F_LOG_ALL; |
d5970055 | 614 | } |
24d1eb33 | 615 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_FEATURES, &features); |
d5970055 MT |
616 | return r < 0 ? -errno : 0; |
617 | } | |
618 | ||
619 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
620 | { | |
621 | int r, t, i; | |
622 | r = vhost_dev_set_features(dev, enable_log); | |
623 | if (r < 0) { | |
624 | goto err_features; | |
625 | } | |
626 | for (i = 0; i < dev->nvqs; ++i) { | |
627 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
628 | enable_log); | |
629 | if (r < 0) { | |
630 | goto err_vq; | |
631 | } | |
632 | } | |
633 | return 0; | |
634 | err_vq: | |
635 | for (; i >= 0; --i) { | |
636 | t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
637 | dev->log_enabled); | |
638 | assert(t >= 0); | |
639 | } | |
640 | t = vhost_dev_set_features(dev, dev->log_enabled); | |
641 | assert(t >= 0); | |
642 | err_features: | |
643 | return r; | |
644 | } | |
645 | ||
04097f7c | 646 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 647 | { |
04097f7c AK |
648 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
649 | memory_listener); | |
d5970055 MT |
650 | int r; |
651 | if (!!enable == dev->log_enabled) { | |
652 | return 0; | |
653 | } | |
654 | if (!dev->started) { | |
655 | dev->log_enabled = enable; | |
656 | return 0; | |
657 | } | |
658 | if (!enable) { | |
659 | r = vhost_dev_set_log(dev, false); | |
660 | if (r < 0) { | |
661 | return r; | |
662 | } | |
309750fa | 663 | vhost_log_put(dev, false); |
d5970055 MT |
664 | dev->log = NULL; |
665 | dev->log_size = 0; | |
666 | } else { | |
667 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
668 | r = vhost_dev_set_log(dev, true); | |
669 | if (r < 0) { | |
670 | return r; | |
671 | } | |
672 | } | |
673 | dev->log_enabled = enable; | |
674 | return 0; | |
675 | } | |
676 | ||
04097f7c AK |
677 | static void vhost_log_global_start(MemoryListener *listener) |
678 | { | |
679 | int r; | |
680 | ||
681 | r = vhost_migration_log(listener, true); | |
682 | if (r < 0) { | |
683 | abort(); | |
684 | } | |
685 | } | |
686 | ||
687 | static void vhost_log_global_stop(MemoryListener *listener) | |
688 | { | |
689 | int r; | |
690 | ||
691 | r = vhost_migration_log(listener, false); | |
692 | if (r < 0) { | |
693 | abort(); | |
694 | } | |
695 | } | |
696 | ||
697 | static void vhost_log_start(MemoryListener *listener, | |
b2dfd71c PB |
698 | MemoryRegionSection *section, |
699 | int old, int new) | |
04097f7c AK |
700 | { |
701 | /* FIXME: implement */ | |
702 | } | |
703 | ||
704 | static void vhost_log_stop(MemoryListener *listener, | |
b2dfd71c PB |
705 | MemoryRegionSection *section, |
706 | int old, int new) | |
04097f7c AK |
707 | { |
708 | /* FIXME: implement */ | |
709 | } | |
710 | ||
04b7a152 GK |
711 | static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, |
712 | bool is_big_endian, | |
713 | int vhost_vq_index) | |
714 | { | |
715 | struct vhost_vring_state s = { | |
716 | .index = vhost_vq_index, | |
717 | .num = is_big_endian | |
718 | }; | |
719 | ||
720 | if (!dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_ENDIAN, &s)) { | |
721 | return 0; | |
722 | } | |
723 | ||
724 | if (errno == ENOTTY) { | |
725 | error_report("vhost does not support cross-endian"); | |
726 | return -ENOSYS; | |
727 | } | |
728 | ||
729 | return -errno; | |
730 | } | |
731 | ||
f56a1247 | 732 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
733 | struct VirtIODevice *vdev, |
734 | struct vhost_virtqueue *vq, | |
735 | unsigned idx) | |
736 | { | |
a8170e5e | 737 | hwaddr s, l, a; |
d5970055 | 738 | int r; |
fc57fd99 | 739 | int vhost_vq_index = dev->vhost_ops->vhost_backend_get_vq_index(dev, idx); |
d5970055 | 740 | struct vhost_vring_file file = { |
a9f98bb5 | 741 | .index = vhost_vq_index |
d5970055 MT |
742 | }; |
743 | struct vhost_vring_state state = { | |
a9f98bb5 | 744 | .index = vhost_vq_index |
d5970055 MT |
745 | }; |
746 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
747 | ||
a9f98bb5 | 748 | |
d5970055 | 749 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
24d1eb33 | 750 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_NUM, &state); |
d5970055 MT |
751 | if (r) { |
752 | return -errno; | |
753 | } | |
754 | ||
755 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
24d1eb33 | 756 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_BASE, &state); |
d5970055 MT |
757 | if (r) { |
758 | return -errno; | |
759 | } | |
760 | ||
95129d6f | 761 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && |
04b7a152 GK |
762 | virtio_legacy_is_cross_endian(vdev)) { |
763 | r = vhost_virtqueue_set_vring_endian_legacy(dev, | |
764 | virtio_is_big_endian(vdev), | |
765 | vhost_vq_index); | |
766 | if (r) { | |
767 | return -errno; | |
768 | } | |
769 | } | |
770 | ||
d5970055 MT |
771 | s = l = virtio_queue_get_desc_size(vdev, idx); |
772 | a = virtio_queue_get_desc_addr(vdev, idx); | |
773 | vq->desc = cpu_physical_memory_map(a, &l, 0); | |
774 | if (!vq->desc || l != s) { | |
775 | r = -ENOMEM; | |
776 | goto fail_alloc_desc; | |
777 | } | |
778 | s = l = virtio_queue_get_avail_size(vdev, idx); | |
779 | a = virtio_queue_get_avail_addr(vdev, idx); | |
780 | vq->avail = cpu_physical_memory_map(a, &l, 0); | |
781 | if (!vq->avail || l != s) { | |
782 | r = -ENOMEM; | |
783 | goto fail_alloc_avail; | |
784 | } | |
785 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
786 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
787 | vq->used = cpu_physical_memory_map(a, &l, 1); | |
788 | if (!vq->used || l != s) { | |
789 | r = -ENOMEM; | |
790 | goto fail_alloc_used; | |
791 | } | |
792 | ||
793 | vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); | |
794 | vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); | |
795 | vq->ring = cpu_physical_memory_map(a, &l, 1); | |
796 | if (!vq->ring || l != s) { | |
797 | r = -ENOMEM; | |
798 | goto fail_alloc_ring; | |
799 | } | |
800 | ||
a9f98bb5 | 801 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
802 | if (r < 0) { |
803 | r = -errno; | |
804 | goto fail_alloc; | |
805 | } | |
a9f98bb5 | 806 | |
d5970055 | 807 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
24d1eb33 | 808 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_KICK, &file); |
d5970055 | 809 | if (r) { |
c8852121 | 810 | r = -errno; |
d5970055 MT |
811 | goto fail_kick; |
812 | } | |
813 | ||
f56a1247 MT |
814 | /* Clear and discard previous events if any. */ |
815 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 MT |
816 | |
817 | return 0; | |
818 | ||
d5970055 | 819 | fail_kick: |
d5970055 MT |
820 | fail_alloc: |
821 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
822 | 0, 0); | |
823 | fail_alloc_ring: | |
824 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
825 | 0, 0); | |
826 | fail_alloc_used: | |
827 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
828 | 0, 0); | |
829 | fail_alloc_avail: | |
830 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
831 | 0, 0); | |
832 | fail_alloc_desc: | |
833 | return r; | |
834 | } | |
835 | ||
f56a1247 | 836 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
837 | struct VirtIODevice *vdev, |
838 | struct vhost_virtqueue *vq, | |
839 | unsigned idx) | |
840 | { | |
fc57fd99 | 841 | int vhost_vq_index = dev->vhost_ops->vhost_backend_get_vq_index(dev, idx); |
d5970055 | 842 | struct vhost_vring_state state = { |
04b7a152 | 843 | .index = vhost_vq_index, |
d5970055 MT |
844 | }; |
845 | int r; | |
fc57fd99 | 846 | |
24d1eb33 | 847 | r = dev->vhost_ops->vhost_call(dev, VHOST_GET_VRING_BASE, &state); |
d5970055 MT |
848 | if (r < 0) { |
849 | fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r); | |
850 | fflush(stderr); | |
851 | } | |
852 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
3561ba14 | 853 | virtio_queue_invalidate_signalled_used(vdev, idx); |
04b7a152 GK |
854 | |
855 | /* In the cross-endian case, we need to reset the vring endianness to | |
856 | * native as legacy devices expect so by default. | |
857 | */ | |
95129d6f | 858 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && |
04b7a152 GK |
859 | virtio_legacy_is_cross_endian(vdev)) { |
860 | r = vhost_virtqueue_set_vring_endian_legacy(dev, | |
861 | !virtio_is_big_endian(vdev), | |
862 | vhost_vq_index); | |
863 | if (r < 0) { | |
864 | error_report("failed to reset vring endianness"); | |
865 | } | |
866 | } | |
867 | ||
d5970055 MT |
868 | assert (r >= 0); |
869 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
870 | 0, virtio_queue_get_ring_size(vdev, idx)); | |
871 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
872 | 1, virtio_queue_get_used_size(vdev, idx)); | |
873 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
874 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
875 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
876 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
877 | } | |
878 | ||
80a1ea37 AK |
879 | static void vhost_eventfd_add(MemoryListener *listener, |
880 | MemoryRegionSection *section, | |
753d5e14 | 881 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
882 | { |
883 | } | |
884 | ||
885 | static void vhost_eventfd_del(MemoryListener *listener, | |
886 | MemoryRegionSection *section, | |
753d5e14 | 887 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
888 | { |
889 | } | |
890 | ||
f56a1247 MT |
891 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
892 | struct vhost_virtqueue *vq, int n) | |
893 | { | |
b931bfbf | 894 | int vhost_vq_index = dev->vhost_ops->vhost_backend_get_vq_index(dev, n); |
f56a1247 | 895 | struct vhost_vring_file file = { |
b931bfbf | 896 | .index = vhost_vq_index, |
f56a1247 MT |
897 | }; |
898 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
899 | if (r < 0) { | |
900 | return r; | |
901 | } | |
902 | ||
903 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
24d1eb33 | 904 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_CALL, &file); |
f56a1247 MT |
905 | if (r) { |
906 | r = -errno; | |
907 | goto fail_call; | |
908 | } | |
909 | return 0; | |
910 | fail_call: | |
911 | event_notifier_cleanup(&vq->masked_notifier); | |
912 | return r; | |
913 | } | |
914 | ||
915 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
916 | { | |
917 | event_notifier_cleanup(&vq->masked_notifier); | |
918 | } | |
919 | ||
81647a65 | 920 | int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
1e7398a1 | 921 | VhostBackendType backend_type) |
d5970055 MT |
922 | { |
923 | uint64_t features; | |
f56a1247 | 924 | int i, r; |
81647a65 | 925 | |
1a1bfac9 | 926 | if (vhost_set_backend_type(hdev, backend_type) < 0) { |
b19ca188 | 927 | close((uintptr_t)opaque); |
1a1bfac9 NN |
928 | return -1; |
929 | } | |
930 | ||
24d1eb33 | 931 | if (hdev->vhost_ops->vhost_backend_init(hdev, opaque) < 0) { |
b19ca188 | 932 | close((uintptr_t)opaque); |
24d1eb33 NN |
933 | return -errno; |
934 | } | |
935 | ||
aebf8168 IM |
936 | if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { |
937 | fprintf(stderr, "vhost backend memory slots limit is less" | |
938 | " than current number of present memory slots\n"); | |
939 | close((uintptr_t)opaque); | |
940 | return -1; | |
941 | } | |
2ce68e4c IM |
942 | QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); |
943 | ||
24d1eb33 | 944 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_OWNER, NULL); |
d5970055 MT |
945 | if (r < 0) { |
946 | goto fail; | |
947 | } | |
948 | ||
24d1eb33 | 949 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_GET_FEATURES, &features); |
d5970055 MT |
950 | if (r < 0) { |
951 | goto fail; | |
952 | } | |
f56a1247 MT |
953 | |
954 | for (i = 0; i < hdev->nvqs; ++i) { | |
b931bfbf | 955 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); |
f56a1247 MT |
956 | if (r < 0) { |
957 | goto fail_vq; | |
958 | } | |
959 | } | |
d5970055 MT |
960 | hdev->features = features; |
961 | ||
04097f7c | 962 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
963 | .begin = vhost_begin, |
964 | .commit = vhost_commit, | |
04097f7c AK |
965 | .region_add = vhost_region_add, |
966 | .region_del = vhost_region_del, | |
50c1e149 | 967 | .region_nop = vhost_region_nop, |
04097f7c AK |
968 | .log_start = vhost_log_start, |
969 | .log_stop = vhost_log_stop, | |
970 | .log_sync = vhost_log_sync, | |
971 | .log_global_start = vhost_log_global_start, | |
972 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
973 | .eventfd_add = vhost_eventfd_add, |
974 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 975 | .priority = 10 |
04097f7c | 976 | }; |
7145872e | 977 | hdev->migration_blocker = NULL; |
9a2ba823 | 978 | if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { |
7145872e MT |
979 | error_setg(&hdev->migration_blocker, |
980 | "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); | |
981 | migrate_add_blocker(hdev->migration_blocker); | |
982 | } | |
7267c094 | 983 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
984 | hdev->n_mem_sections = 0; |
985 | hdev->mem_sections = NULL; | |
d5970055 MT |
986 | hdev->log = NULL; |
987 | hdev->log_size = 0; | |
988 | hdev->log_enabled = false; | |
989 | hdev->started = false; | |
af603142 | 990 | hdev->memory_changed = false; |
f6790af6 | 991 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
d5970055 | 992 | return 0; |
f56a1247 MT |
993 | fail_vq: |
994 | while (--i >= 0) { | |
995 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
996 | } | |
d5970055 MT |
997 | fail: |
998 | r = -errno; | |
24d1eb33 | 999 | hdev->vhost_ops->vhost_backend_cleanup(hdev); |
2ce68e4c | 1000 | QLIST_REMOVE(hdev, entry); |
d5970055 MT |
1001 | return r; |
1002 | } | |
1003 | ||
1004 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
1005 | { | |
f56a1247 MT |
1006 | int i; |
1007 | for (i = 0; i < hdev->nvqs; ++i) { | |
1008 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
1009 | } | |
04097f7c | 1010 | memory_listener_unregister(&hdev->memory_listener); |
7145872e MT |
1011 | if (hdev->migration_blocker) { |
1012 | migrate_del_blocker(hdev->migration_blocker); | |
1013 | error_free(hdev->migration_blocker); | |
1014 | } | |
7267c094 | 1015 | g_free(hdev->mem); |
2817b260 | 1016 | g_free(hdev->mem_sections); |
24d1eb33 | 1017 | hdev->vhost_ops->vhost_backend_cleanup(hdev); |
2ce68e4c | 1018 | QLIST_REMOVE(hdev, entry); |
d5970055 MT |
1019 | } |
1020 | ||
b0b3db79 MT |
1021 | /* Stop processing guest IO notifications in qemu. |
1022 | * Start processing them in vhost in kernel. | |
1023 | */ | |
1024 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1025 | { | |
1c819449 FK |
1026 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
1027 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
1028 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
16617e36 | 1029 | int i, r, e; |
1c819449 | 1030 | if (!k->set_host_notifier) { |
b0b3db79 MT |
1031 | fprintf(stderr, "binding does not support host notifiers\n"); |
1032 | r = -ENOSYS; | |
1033 | goto fail; | |
1034 | } | |
1035 | ||
1036 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 1037 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, true); |
b0b3db79 MT |
1038 | if (r < 0) { |
1039 | fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r); | |
1040 | goto fail_vq; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | return 0; | |
1045 | fail_vq: | |
1046 | while (--i >= 0) { | |
16617e36 JW |
1047 | e = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
1048 | if (e < 0) { | |
b0b3db79 MT |
1049 | fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r); |
1050 | fflush(stderr); | |
1051 | } | |
16617e36 | 1052 | assert (e >= 0); |
b0b3db79 MT |
1053 | } |
1054 | fail: | |
1055 | return r; | |
1056 | } | |
1057 | ||
1058 | /* Stop processing guest IO notifications in vhost. | |
1059 | * Start processing them in qemu. | |
1060 | * This might actually run the qemu handlers right away, | |
1061 | * so virtio in qemu must be completely setup when this is called. | |
1062 | */ | |
1063 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1064 | { | |
1c819449 FK |
1065 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
1066 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
1067 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 MT |
1068 | int i, r; |
1069 | ||
1070 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 1071 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
1072 | if (r < 0) { |
1073 | fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r); | |
1074 | fflush(stderr); | |
1075 | } | |
1076 | assert (r >= 0); | |
1077 | } | |
1078 | } | |
1079 | ||
f56a1247 MT |
1080 | /* Test and clear event pending status. |
1081 | * Should be called after unmask to avoid losing events. | |
1082 | */ | |
1083 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
1084 | { | |
a9f98bb5 | 1085 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
a9f98bb5 | 1086 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
1087 | return event_notifier_test_and_clear(&vq->masked_notifier); |
1088 | } | |
1089 | ||
1090 | /* Mask/unmask events from this vq. */ | |
1091 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
1092 | bool mask) | |
1093 | { | |
1094 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 1095 | int r, index = n - hdev->vq_index; |
fc57fd99 | 1096 | struct vhost_vring_file file; |
f56a1247 | 1097 | |
f56a1247 | 1098 | if (mask) { |
a9f98bb5 | 1099 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
1100 | } else { |
1101 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
1102 | } | |
fc57fd99 YL |
1103 | |
1104 | file.index = hdev->vhost_ops->vhost_backend_get_vq_index(hdev, n); | |
24d1eb33 | 1105 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_VRING_CALL, &file); |
f56a1247 MT |
1106 | assert(r >= 0); |
1107 | } | |
1108 | ||
9a2ba823 CH |
1109 | uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
1110 | uint64_t features) | |
2e6d46d7 NN |
1111 | { |
1112 | const int *bit = feature_bits; | |
1113 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1114 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1115 | if (!(hdev->features & bit_mask)) { |
1116 | features &= ~bit_mask; | |
1117 | } | |
1118 | bit++; | |
1119 | } | |
1120 | return features; | |
1121 | } | |
1122 | ||
1123 | void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, | |
9a2ba823 | 1124 | uint64_t features) |
2e6d46d7 NN |
1125 | { |
1126 | const int *bit = feature_bits; | |
1127 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1128 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1129 | if (features & bit_mask) { |
1130 | hdev->acked_features |= bit_mask; | |
1131 | } | |
1132 | bit++; | |
1133 | } | |
1134 | } | |
1135 | ||
b0b3db79 | 1136 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1137 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1138 | { | |
1139 | int i, r; | |
24f4fe34 MT |
1140 | |
1141 | hdev->started = true; | |
1142 | ||
d5970055 MT |
1143 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1144 | if (r < 0) { | |
54dd9321 | 1145 | goto fail_features; |
d5970055 | 1146 | } |
24d1eb33 | 1147 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_MEM_TABLE, hdev->mem); |
d5970055 MT |
1148 | if (r < 0) { |
1149 | r = -errno; | |
54dd9321 | 1150 | goto fail_mem; |
d5970055 | 1151 | } |
d154e0ba | 1152 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1153 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1154 | vdev, |
1155 | hdev->vqs + i, | |
1156 | hdev->vq_index + i); | |
d154e0ba MT |
1157 | if (r < 0) { |
1158 | goto fail_vq; | |
1159 | } | |
1160 | } | |
1161 | ||
d5970055 | 1162 | if (hdev->log_enabled) { |
e05ca820 MT |
1163 | uint64_t log_base; |
1164 | ||
d5970055 | 1165 | hdev->log_size = vhost_get_log_size(hdev); |
309750fa JW |
1166 | hdev->log = vhost_log_get(hdev->log_size); |
1167 | log_base = (uintptr_t)hdev->log->log; | |
1168 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_LOG_BASE, | |
1169 | hdev->log_size ? &log_base : NULL); | |
d5970055 MT |
1170 | if (r < 0) { |
1171 | r = -errno; | |
54dd9321 | 1172 | goto fail_log; |
d5970055 MT |
1173 | } |
1174 | } | |
d154e0ba | 1175 | |
d5970055 | 1176 | return 0; |
54dd9321 | 1177 | fail_log: |
24bfa207 | 1178 | vhost_log_put(hdev, false); |
d5970055 MT |
1179 | fail_vq: |
1180 | while (--i >= 0) { | |
f56a1247 | 1181 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1182 | vdev, |
1183 | hdev->vqs + i, | |
1184 | hdev->vq_index + i); | |
d5970055 | 1185 | } |
a9f98bb5 | 1186 | i = hdev->nvqs; |
54dd9321 MT |
1187 | fail_mem: |
1188 | fail_features: | |
24f4fe34 MT |
1189 | |
1190 | hdev->started = false; | |
d5970055 MT |
1191 | return r; |
1192 | } | |
1193 | ||
b0b3db79 | 1194 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1195 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1196 | { | |
a9f98bb5 | 1197 | int i; |
54dd9321 | 1198 | |
d5970055 | 1199 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1200 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1201 | vdev, |
1202 | hdev->vqs + i, | |
1203 | hdev->vq_index + i); | |
d5970055 | 1204 | } |
54dd9321 | 1205 | |
309750fa | 1206 | vhost_log_put(hdev, true); |
d5970055 | 1207 | hdev->started = false; |
c1be973a | 1208 | hdev->log = NULL; |
d5970055 MT |
1209 | hdev->log_size = 0; |
1210 | } | |
a9f98bb5 | 1211 |