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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 | |
636f4ddd MAL |
353 | /* inform backend of log switching, this must be done before |
354 | releasing the current log, to ensure no logging is lost */ | |
24d1eb33 | 355 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_LOG_BASE, &log_base); |
d5970055 | 356 | assert(r >= 0); |
309750fa | 357 | vhost_log_put(dev, true); |
d5970055 MT |
358 | dev->log = log; |
359 | dev->log_size = size; | |
360 | } | |
361 | ||
362 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, | |
363 | uint64_t start_addr, | |
364 | uint64_t size) | |
365 | { | |
366 | int i; | |
8617343f MT |
367 | int r = 0; |
368 | ||
369 | for (i = 0; !r && i < dev->nvqs; ++i) { | |
d5970055 | 370 | struct vhost_virtqueue *vq = dev->vqs + i; |
a8170e5e | 371 | hwaddr l; |
d5970055 MT |
372 | void *p; |
373 | ||
374 | if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) { | |
375 | continue; | |
376 | } | |
377 | l = vq->ring_size; | |
378 | p = cpu_physical_memory_map(vq->ring_phys, &l, 1); | |
379 | if (!p || l != vq->ring_size) { | |
380 | fprintf(stderr, "Unable to map ring buffer for ring %d\n", i); | |
8617343f | 381 | r = -ENOMEM; |
d5970055 MT |
382 | } |
383 | if (p != vq->ring) { | |
384 | fprintf(stderr, "Ring buffer relocated for ring %d\n", i); | |
8617343f | 385 | r = -EBUSY; |
d5970055 MT |
386 | } |
387 | cpu_physical_memory_unmap(p, l, 0, 0); | |
388 | } | |
8617343f | 389 | return r; |
d5970055 MT |
390 | } |
391 | ||
4e789564 MT |
392 | static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
393 | uint64_t start_addr, | |
394 | uint64_t size) | |
395 | { | |
396 | int i, n = dev->mem->nregions; | |
397 | for (i = 0; i < n; ++i) { | |
398 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
399 | if (ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
400 | start_addr, size)) { | |
401 | return reg; | |
402 | } | |
403 | } | |
404 | return NULL; | |
405 | } | |
406 | ||
407 | static bool vhost_dev_cmp_memory(struct vhost_dev *dev, | |
408 | uint64_t start_addr, | |
409 | uint64_t size, | |
410 | uint64_t uaddr) | |
411 | { | |
412 | struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size); | |
413 | uint64_t reglast; | |
414 | uint64_t memlast; | |
415 | ||
416 | if (!reg) { | |
417 | return true; | |
418 | } | |
419 | ||
420 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
421 | memlast = range_get_last(start_addr, size); | |
422 | ||
423 | /* Need to extend region? */ | |
424 | if (start_addr < reg->guest_phys_addr || memlast > reglast) { | |
425 | return true; | |
426 | } | |
427 | /* userspace_addr changed? */ | |
428 | return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr; | |
429 | } | |
430 | ||
04097f7c AK |
431 | static void vhost_set_memory(MemoryListener *listener, |
432 | MemoryRegionSection *section, | |
433 | bool add) | |
d5970055 | 434 | { |
04097f7c AK |
435 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
436 | memory_listener); | |
a8170e5e | 437 | hwaddr start_addr = section->offset_within_address_space; |
052e87b0 | 438 | ram_addr_t size = int128_get64(section->size); |
2d1a35be PB |
439 | bool log_dirty = |
440 | memory_region_get_dirty_log_mask(section->mr) & ~(1 << DIRTY_MEMORY_MIGRATION); | |
d5970055 MT |
441 | int s = offsetof(struct vhost_memory, regions) + |
442 | (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; | |
04097f7c AK |
443 | void *ram; |
444 | ||
7267c094 | 445 | dev->mem = g_realloc(dev->mem, s); |
d5970055 | 446 | |
f5a4e64f | 447 | if (log_dirty) { |
04097f7c | 448 | add = false; |
f5a4e64f MT |
449 | } |
450 | ||
d5970055 MT |
451 | assert(size); |
452 | ||
4e789564 | 453 | /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */ |
d743c382 | 454 | ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
04097f7c AK |
455 | if (add) { |
456 | if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) { | |
4e789564 MT |
457 | /* Region exists with same address. Nothing to do. */ |
458 | return; | |
459 | } | |
460 | } else { | |
461 | if (!vhost_dev_find_reg(dev, start_addr, size)) { | |
462 | /* Removing region that we don't access. Nothing to do. */ | |
463 | return; | |
464 | } | |
465 | } | |
466 | ||
d5970055 | 467 | vhost_dev_unassign_memory(dev, start_addr, size); |
04097f7c | 468 | if (add) { |
d5970055 | 469 | /* Add given mapping, merging adjacent regions if any */ |
04097f7c | 470 | vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
d5970055 MT |
471 | } else { |
472 | /* Remove old mapping for this memory, if any. */ | |
473 | vhost_dev_unassign_memory(dev, start_addr, size); | |
474 | } | |
af603142 NB |
475 | dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); |
476 | dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); | |
477 | dev->memory_changed = true; | |
2ce68e4c | 478 | used_memslots = dev->mem->nregions; |
af603142 NB |
479 | } |
480 | ||
481 | static bool vhost_section(MemoryRegionSection *section) | |
482 | { | |
483 | return memory_region_is_ram(section->mr); | |
484 | } | |
485 | ||
486 | static void vhost_begin(MemoryListener *listener) | |
487 | { | |
488 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
489 | memory_listener); | |
490 | dev->mem_changed_end_addr = 0; | |
491 | dev->mem_changed_start_addr = -1; | |
492 | } | |
d5970055 | 493 | |
af603142 NB |
494 | static void vhost_commit(MemoryListener *listener) |
495 | { | |
496 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
497 | memory_listener); | |
498 | hwaddr start_addr = 0; | |
499 | ram_addr_t size = 0; | |
500 | uint64_t log_size; | |
501 | int r; | |
502 | ||
503 | if (!dev->memory_changed) { | |
504 | return; | |
505 | } | |
d5970055 MT |
506 | if (!dev->started) { |
507 | return; | |
508 | } | |
af603142 NB |
509 | if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { |
510 | return; | |
511 | } | |
d5970055 MT |
512 | |
513 | if (dev->started) { | |
af603142 NB |
514 | start_addr = dev->mem_changed_start_addr; |
515 | size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; | |
516 | ||
d5970055 MT |
517 | r = vhost_verify_ring_mappings(dev, start_addr, size); |
518 | assert(r >= 0); | |
519 | } | |
520 | ||
521 | if (!dev->log_enabled) { | |
24d1eb33 | 522 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_MEM_TABLE, dev->mem); |
d5970055 | 523 | assert(r >= 0); |
af603142 | 524 | dev->memory_changed = false; |
d5970055 MT |
525 | return; |
526 | } | |
527 | log_size = vhost_get_log_size(dev); | |
528 | /* We allocate an extra 4K bytes to log, | |
529 | * to reduce the * number of reallocations. */ | |
530 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
531 | /* To log more, must increase log size before table update. */ | |
532 | if (dev->log_size < log_size) { | |
533 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
534 | } | |
24d1eb33 | 535 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_MEM_TABLE, dev->mem); |
d5970055 MT |
536 | assert(r >= 0); |
537 | /* To log less, can only decrease log size after table update. */ | |
538 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
539 | vhost_dev_log_resize(dev, log_size); | |
540 | } | |
af603142 | 541 | dev->memory_changed = false; |
50c1e149 AK |
542 | } |
543 | ||
04097f7c AK |
544 | static void vhost_region_add(MemoryListener *listener, |
545 | MemoryRegionSection *section) | |
546 | { | |
2817b260 AK |
547 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
548 | memory_listener); | |
549 | ||
c49450b9 AK |
550 | if (!vhost_section(section)) { |
551 | return; | |
552 | } | |
553 | ||
2817b260 AK |
554 | ++dev->n_mem_sections; |
555 | dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, | |
556 | dev->n_mem_sections); | |
557 | dev->mem_sections[dev->n_mem_sections - 1] = *section; | |
dfde4e6e | 558 | memory_region_ref(section->mr); |
04097f7c AK |
559 | vhost_set_memory(listener, section, true); |
560 | } | |
561 | ||
562 | static void vhost_region_del(MemoryListener *listener, | |
563 | MemoryRegionSection *section) | |
564 | { | |
2817b260 AK |
565 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
566 | memory_listener); | |
567 | int i; | |
568 | ||
c49450b9 AK |
569 | if (!vhost_section(section)) { |
570 | return; | |
571 | } | |
572 | ||
04097f7c | 573 | vhost_set_memory(listener, section, false); |
dfde4e6e | 574 | memory_region_unref(section->mr); |
2817b260 AK |
575 | for (i = 0; i < dev->n_mem_sections; ++i) { |
576 | if (dev->mem_sections[i].offset_within_address_space | |
577 | == section->offset_within_address_space) { | |
578 | --dev->n_mem_sections; | |
579 | memmove(&dev->mem_sections[i], &dev->mem_sections[i+1], | |
637f7a6a | 580 | (dev->n_mem_sections - i) * sizeof(*dev->mem_sections)); |
2817b260 AK |
581 | break; |
582 | } | |
583 | } | |
04097f7c AK |
584 | } |
585 | ||
50c1e149 AK |
586 | static void vhost_region_nop(MemoryListener *listener, |
587 | MemoryRegionSection *section) | |
588 | { | |
589 | } | |
590 | ||
d5970055 MT |
591 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
592 | struct vhost_virtqueue *vq, | |
593 | unsigned idx, bool enable_log) | |
594 | { | |
595 | struct vhost_vring_addr addr = { | |
596 | .index = idx, | |
2b3af999 SW |
597 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
598 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
599 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
600 | .log_guest_addr = vq->used_phys, |
601 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
602 | }; | |
24d1eb33 | 603 | int r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_ADDR, &addr); |
d5970055 MT |
604 | if (r < 0) { |
605 | return -errno; | |
606 | } | |
607 | return 0; | |
608 | } | |
609 | ||
610 | static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) | |
611 | { | |
612 | uint64_t features = dev->acked_features; | |
613 | int r; | |
614 | if (enable_log) { | |
9a2ba823 | 615 | features |= 0x1ULL << VHOST_F_LOG_ALL; |
d5970055 | 616 | } |
24d1eb33 | 617 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_FEATURES, &features); |
d5970055 MT |
618 | return r < 0 ? -errno : 0; |
619 | } | |
620 | ||
621 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
622 | { | |
623 | int r, t, i; | |
624 | r = vhost_dev_set_features(dev, enable_log); | |
625 | if (r < 0) { | |
626 | goto err_features; | |
627 | } | |
628 | for (i = 0; i < dev->nvqs; ++i) { | |
629 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
630 | enable_log); | |
631 | if (r < 0) { | |
632 | goto err_vq; | |
633 | } | |
634 | } | |
635 | return 0; | |
636 | err_vq: | |
637 | for (; i >= 0; --i) { | |
638 | t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
639 | dev->log_enabled); | |
640 | assert(t >= 0); | |
641 | } | |
642 | t = vhost_dev_set_features(dev, dev->log_enabled); | |
643 | assert(t >= 0); | |
644 | err_features: | |
645 | return r; | |
646 | } | |
647 | ||
04097f7c | 648 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 649 | { |
04097f7c AK |
650 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
651 | memory_listener); | |
d5970055 MT |
652 | int r; |
653 | if (!!enable == dev->log_enabled) { | |
654 | return 0; | |
655 | } | |
656 | if (!dev->started) { | |
657 | dev->log_enabled = enable; | |
658 | return 0; | |
659 | } | |
660 | if (!enable) { | |
661 | r = vhost_dev_set_log(dev, false); | |
662 | if (r < 0) { | |
663 | return r; | |
664 | } | |
309750fa | 665 | vhost_log_put(dev, false); |
d5970055 MT |
666 | dev->log = NULL; |
667 | dev->log_size = 0; | |
668 | } else { | |
669 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
670 | r = vhost_dev_set_log(dev, true); | |
671 | if (r < 0) { | |
672 | return r; | |
673 | } | |
674 | } | |
675 | dev->log_enabled = enable; | |
676 | return 0; | |
677 | } | |
678 | ||
04097f7c AK |
679 | static void vhost_log_global_start(MemoryListener *listener) |
680 | { | |
681 | int r; | |
682 | ||
683 | r = vhost_migration_log(listener, true); | |
684 | if (r < 0) { | |
685 | abort(); | |
686 | } | |
687 | } | |
688 | ||
689 | static void vhost_log_global_stop(MemoryListener *listener) | |
690 | { | |
691 | int r; | |
692 | ||
693 | r = vhost_migration_log(listener, false); | |
694 | if (r < 0) { | |
695 | abort(); | |
696 | } | |
697 | } | |
698 | ||
699 | static void vhost_log_start(MemoryListener *listener, | |
b2dfd71c PB |
700 | MemoryRegionSection *section, |
701 | int old, int new) | |
04097f7c AK |
702 | { |
703 | /* FIXME: implement */ | |
704 | } | |
705 | ||
706 | static void vhost_log_stop(MemoryListener *listener, | |
b2dfd71c PB |
707 | MemoryRegionSection *section, |
708 | int old, int new) | |
04097f7c AK |
709 | { |
710 | /* FIXME: implement */ | |
711 | } | |
712 | ||
04b7a152 GK |
713 | static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, |
714 | bool is_big_endian, | |
715 | int vhost_vq_index) | |
716 | { | |
717 | struct vhost_vring_state s = { | |
718 | .index = vhost_vq_index, | |
719 | .num = is_big_endian | |
720 | }; | |
721 | ||
722 | if (!dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_ENDIAN, &s)) { | |
723 | return 0; | |
724 | } | |
725 | ||
726 | if (errno == ENOTTY) { | |
727 | error_report("vhost does not support cross-endian"); | |
728 | return -ENOSYS; | |
729 | } | |
730 | ||
731 | return -errno; | |
732 | } | |
733 | ||
f56a1247 | 734 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
735 | struct VirtIODevice *vdev, |
736 | struct vhost_virtqueue *vq, | |
737 | unsigned idx) | |
738 | { | |
a8170e5e | 739 | hwaddr s, l, a; |
d5970055 | 740 | int r; |
fc57fd99 | 741 | int vhost_vq_index = dev->vhost_ops->vhost_backend_get_vq_index(dev, idx); |
d5970055 | 742 | struct vhost_vring_file file = { |
a9f98bb5 | 743 | .index = vhost_vq_index |
d5970055 MT |
744 | }; |
745 | struct vhost_vring_state state = { | |
a9f98bb5 | 746 | .index = vhost_vq_index |
d5970055 MT |
747 | }; |
748 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
749 | ||
a9f98bb5 | 750 | |
d5970055 | 751 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
24d1eb33 | 752 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_NUM, &state); |
d5970055 MT |
753 | if (r) { |
754 | return -errno; | |
755 | } | |
756 | ||
757 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
24d1eb33 | 758 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_BASE, &state); |
d5970055 MT |
759 | if (r) { |
760 | return -errno; | |
761 | } | |
762 | ||
95129d6f | 763 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && |
04b7a152 GK |
764 | virtio_legacy_is_cross_endian(vdev)) { |
765 | r = vhost_virtqueue_set_vring_endian_legacy(dev, | |
766 | virtio_is_big_endian(vdev), | |
767 | vhost_vq_index); | |
768 | if (r) { | |
769 | return -errno; | |
770 | } | |
771 | } | |
772 | ||
d5970055 MT |
773 | s = l = virtio_queue_get_desc_size(vdev, idx); |
774 | a = virtio_queue_get_desc_addr(vdev, idx); | |
775 | vq->desc = cpu_physical_memory_map(a, &l, 0); | |
776 | if (!vq->desc || l != s) { | |
777 | r = -ENOMEM; | |
778 | goto fail_alloc_desc; | |
779 | } | |
780 | s = l = virtio_queue_get_avail_size(vdev, idx); | |
781 | a = virtio_queue_get_avail_addr(vdev, idx); | |
782 | vq->avail = cpu_physical_memory_map(a, &l, 0); | |
783 | if (!vq->avail || l != s) { | |
784 | r = -ENOMEM; | |
785 | goto fail_alloc_avail; | |
786 | } | |
787 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
788 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
789 | vq->used = cpu_physical_memory_map(a, &l, 1); | |
790 | if (!vq->used || l != s) { | |
791 | r = -ENOMEM; | |
792 | goto fail_alloc_used; | |
793 | } | |
794 | ||
795 | vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); | |
796 | vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); | |
797 | vq->ring = cpu_physical_memory_map(a, &l, 1); | |
798 | if (!vq->ring || l != s) { | |
799 | r = -ENOMEM; | |
800 | goto fail_alloc_ring; | |
801 | } | |
802 | ||
a9f98bb5 | 803 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
804 | if (r < 0) { |
805 | r = -errno; | |
806 | goto fail_alloc; | |
807 | } | |
a9f98bb5 | 808 | |
d5970055 | 809 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
24d1eb33 | 810 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_KICK, &file); |
d5970055 | 811 | if (r) { |
c8852121 | 812 | r = -errno; |
d5970055 MT |
813 | goto fail_kick; |
814 | } | |
815 | ||
f56a1247 MT |
816 | /* Clear and discard previous events if any. */ |
817 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 MT |
818 | |
819 | return 0; | |
820 | ||
d5970055 | 821 | fail_kick: |
d5970055 MT |
822 | fail_alloc: |
823 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
824 | 0, 0); | |
825 | fail_alloc_ring: | |
826 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
827 | 0, 0); | |
828 | fail_alloc_used: | |
829 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
830 | 0, 0); | |
831 | fail_alloc_avail: | |
832 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
833 | 0, 0); | |
834 | fail_alloc_desc: | |
835 | return r; | |
836 | } | |
837 | ||
f56a1247 | 838 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
839 | struct VirtIODevice *vdev, |
840 | struct vhost_virtqueue *vq, | |
841 | unsigned idx) | |
842 | { | |
fc57fd99 | 843 | int vhost_vq_index = dev->vhost_ops->vhost_backend_get_vq_index(dev, idx); |
d5970055 | 844 | struct vhost_vring_state state = { |
04b7a152 | 845 | .index = vhost_vq_index, |
d5970055 MT |
846 | }; |
847 | int r; | |
fc57fd99 | 848 | |
24d1eb33 | 849 | r = dev->vhost_ops->vhost_call(dev, VHOST_GET_VRING_BASE, &state); |
d5970055 MT |
850 | if (r < 0) { |
851 | fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r); | |
852 | fflush(stderr); | |
853 | } | |
854 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
3561ba14 | 855 | virtio_queue_invalidate_signalled_used(vdev, idx); |
04b7a152 GK |
856 | |
857 | /* In the cross-endian case, we need to reset the vring endianness to | |
858 | * native as legacy devices expect so by default. | |
859 | */ | |
95129d6f | 860 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && |
04b7a152 GK |
861 | virtio_legacy_is_cross_endian(vdev)) { |
862 | r = vhost_virtqueue_set_vring_endian_legacy(dev, | |
863 | !virtio_is_big_endian(vdev), | |
864 | vhost_vq_index); | |
865 | if (r < 0) { | |
866 | error_report("failed to reset vring endianness"); | |
867 | } | |
868 | } | |
869 | ||
d5970055 MT |
870 | assert (r >= 0); |
871 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
872 | 0, virtio_queue_get_ring_size(vdev, idx)); | |
873 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
874 | 1, virtio_queue_get_used_size(vdev, idx)); | |
875 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
876 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
877 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
878 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
879 | } | |
880 | ||
80a1ea37 AK |
881 | static void vhost_eventfd_add(MemoryListener *listener, |
882 | MemoryRegionSection *section, | |
753d5e14 | 883 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
884 | { |
885 | } | |
886 | ||
887 | static void vhost_eventfd_del(MemoryListener *listener, | |
888 | MemoryRegionSection *section, | |
753d5e14 | 889 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
890 | { |
891 | } | |
892 | ||
f56a1247 MT |
893 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
894 | struct vhost_virtqueue *vq, int n) | |
895 | { | |
b931bfbf | 896 | int vhost_vq_index = dev->vhost_ops->vhost_backend_get_vq_index(dev, n); |
f56a1247 | 897 | struct vhost_vring_file file = { |
b931bfbf | 898 | .index = vhost_vq_index, |
f56a1247 MT |
899 | }; |
900 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
901 | if (r < 0) { | |
902 | return r; | |
903 | } | |
904 | ||
905 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
24d1eb33 | 906 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_CALL, &file); |
f56a1247 MT |
907 | if (r) { |
908 | r = -errno; | |
909 | goto fail_call; | |
910 | } | |
911 | return 0; | |
912 | fail_call: | |
913 | event_notifier_cleanup(&vq->masked_notifier); | |
914 | return r; | |
915 | } | |
916 | ||
917 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
918 | { | |
919 | event_notifier_cleanup(&vq->masked_notifier); | |
920 | } | |
921 | ||
81647a65 | 922 | int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
1e7398a1 | 923 | VhostBackendType backend_type) |
d5970055 MT |
924 | { |
925 | uint64_t features; | |
f56a1247 | 926 | int i, r; |
81647a65 | 927 | |
1a1bfac9 | 928 | if (vhost_set_backend_type(hdev, backend_type) < 0) { |
b19ca188 | 929 | close((uintptr_t)opaque); |
1a1bfac9 NN |
930 | return -1; |
931 | } | |
932 | ||
24d1eb33 | 933 | if (hdev->vhost_ops->vhost_backend_init(hdev, opaque) < 0) { |
b19ca188 | 934 | close((uintptr_t)opaque); |
24d1eb33 NN |
935 | return -errno; |
936 | } | |
937 | ||
aebf8168 IM |
938 | if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { |
939 | fprintf(stderr, "vhost backend memory slots limit is less" | |
940 | " than current number of present memory slots\n"); | |
941 | close((uintptr_t)opaque); | |
942 | return -1; | |
943 | } | |
2ce68e4c IM |
944 | QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); |
945 | ||
24d1eb33 | 946 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_OWNER, NULL); |
d5970055 MT |
947 | if (r < 0) { |
948 | goto fail; | |
949 | } | |
950 | ||
24d1eb33 | 951 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_GET_FEATURES, &features); |
d5970055 MT |
952 | if (r < 0) { |
953 | goto fail; | |
954 | } | |
f56a1247 MT |
955 | |
956 | for (i = 0; i < hdev->nvqs; ++i) { | |
b931bfbf | 957 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); |
f56a1247 MT |
958 | if (r < 0) { |
959 | goto fail_vq; | |
960 | } | |
961 | } | |
d5970055 MT |
962 | hdev->features = features; |
963 | ||
04097f7c | 964 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
965 | .begin = vhost_begin, |
966 | .commit = vhost_commit, | |
04097f7c AK |
967 | .region_add = vhost_region_add, |
968 | .region_del = vhost_region_del, | |
50c1e149 | 969 | .region_nop = vhost_region_nop, |
04097f7c AK |
970 | .log_start = vhost_log_start, |
971 | .log_stop = vhost_log_stop, | |
972 | .log_sync = vhost_log_sync, | |
973 | .log_global_start = vhost_log_global_start, | |
974 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
975 | .eventfd_add = vhost_eventfd_add, |
976 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 977 | .priority = 10 |
04097f7c | 978 | }; |
7145872e | 979 | hdev->migration_blocker = NULL; |
9a2ba823 | 980 | if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { |
7145872e MT |
981 | error_setg(&hdev->migration_blocker, |
982 | "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); | |
983 | migrate_add_blocker(hdev->migration_blocker); | |
984 | } | |
7267c094 | 985 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
986 | hdev->n_mem_sections = 0; |
987 | hdev->mem_sections = NULL; | |
d5970055 MT |
988 | hdev->log = NULL; |
989 | hdev->log_size = 0; | |
990 | hdev->log_enabled = false; | |
991 | hdev->started = false; | |
af603142 | 992 | hdev->memory_changed = false; |
f6790af6 | 993 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
d5970055 | 994 | return 0; |
f56a1247 MT |
995 | fail_vq: |
996 | while (--i >= 0) { | |
997 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
998 | } | |
d5970055 MT |
999 | fail: |
1000 | r = -errno; | |
24d1eb33 | 1001 | hdev->vhost_ops->vhost_backend_cleanup(hdev); |
2ce68e4c | 1002 | QLIST_REMOVE(hdev, entry); |
d5970055 MT |
1003 | return r; |
1004 | } | |
1005 | ||
1006 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
1007 | { | |
f56a1247 MT |
1008 | int i; |
1009 | for (i = 0; i < hdev->nvqs; ++i) { | |
1010 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
1011 | } | |
04097f7c | 1012 | memory_listener_unregister(&hdev->memory_listener); |
7145872e MT |
1013 | if (hdev->migration_blocker) { |
1014 | migrate_del_blocker(hdev->migration_blocker); | |
1015 | error_free(hdev->migration_blocker); | |
1016 | } | |
7267c094 | 1017 | g_free(hdev->mem); |
2817b260 | 1018 | g_free(hdev->mem_sections); |
24d1eb33 | 1019 | hdev->vhost_ops->vhost_backend_cleanup(hdev); |
2ce68e4c | 1020 | QLIST_REMOVE(hdev, entry); |
d5970055 MT |
1021 | } |
1022 | ||
b0b3db79 MT |
1023 | /* Stop processing guest IO notifications in qemu. |
1024 | * Start processing them in vhost in kernel. | |
1025 | */ | |
1026 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1027 | { | |
1c819449 FK |
1028 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
1029 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
1030 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
16617e36 | 1031 | int i, r, e; |
1c819449 | 1032 | if (!k->set_host_notifier) { |
b0b3db79 MT |
1033 | fprintf(stderr, "binding does not support host notifiers\n"); |
1034 | r = -ENOSYS; | |
1035 | goto fail; | |
1036 | } | |
1037 | ||
1038 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 1039 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, true); |
b0b3db79 MT |
1040 | if (r < 0) { |
1041 | fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r); | |
1042 | goto fail_vq; | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | return 0; | |
1047 | fail_vq: | |
1048 | while (--i >= 0) { | |
16617e36 JW |
1049 | e = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
1050 | if (e < 0) { | |
b0b3db79 MT |
1051 | fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r); |
1052 | fflush(stderr); | |
1053 | } | |
16617e36 | 1054 | assert (e >= 0); |
b0b3db79 MT |
1055 | } |
1056 | fail: | |
1057 | return r; | |
1058 | } | |
1059 | ||
1060 | /* Stop processing guest IO notifications in vhost. | |
1061 | * Start processing them in qemu. | |
1062 | * This might actually run the qemu handlers right away, | |
1063 | * so virtio in qemu must be completely setup when this is called. | |
1064 | */ | |
1065 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
1066 | { | |
1c819449 FK |
1067 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
1068 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
1069 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 MT |
1070 | int i, r; |
1071 | ||
1072 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 1073 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
1074 | if (r < 0) { |
1075 | fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r); | |
1076 | fflush(stderr); | |
1077 | } | |
1078 | assert (r >= 0); | |
1079 | } | |
1080 | } | |
1081 | ||
f56a1247 MT |
1082 | /* Test and clear event pending status. |
1083 | * Should be called after unmask to avoid losing events. | |
1084 | */ | |
1085 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
1086 | { | |
a9f98bb5 | 1087 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
a9f98bb5 | 1088 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
1089 | return event_notifier_test_and_clear(&vq->masked_notifier); |
1090 | } | |
1091 | ||
1092 | /* Mask/unmask events from this vq. */ | |
1093 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
1094 | bool mask) | |
1095 | { | |
1096 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 1097 | int r, index = n - hdev->vq_index; |
fc57fd99 | 1098 | struct vhost_vring_file file; |
f56a1247 | 1099 | |
f56a1247 | 1100 | if (mask) { |
a9f98bb5 | 1101 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
1102 | } else { |
1103 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
1104 | } | |
fc57fd99 YL |
1105 | |
1106 | file.index = hdev->vhost_ops->vhost_backend_get_vq_index(hdev, n); | |
24d1eb33 | 1107 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_VRING_CALL, &file); |
f56a1247 MT |
1108 | assert(r >= 0); |
1109 | } | |
1110 | ||
9a2ba823 CH |
1111 | uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
1112 | uint64_t features) | |
2e6d46d7 NN |
1113 | { |
1114 | const int *bit = feature_bits; | |
1115 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1116 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1117 | if (!(hdev->features & bit_mask)) { |
1118 | features &= ~bit_mask; | |
1119 | } | |
1120 | bit++; | |
1121 | } | |
1122 | return features; | |
1123 | } | |
1124 | ||
1125 | void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, | |
9a2ba823 | 1126 | uint64_t features) |
2e6d46d7 NN |
1127 | { |
1128 | const int *bit = feature_bits; | |
1129 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
9a2ba823 | 1130 | uint64_t bit_mask = (1ULL << *bit); |
2e6d46d7 NN |
1131 | if (features & bit_mask) { |
1132 | hdev->acked_features |= bit_mask; | |
1133 | } | |
1134 | bit++; | |
1135 | } | |
1136 | } | |
1137 | ||
b0b3db79 | 1138 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1139 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1140 | { | |
1141 | int i, r; | |
24f4fe34 MT |
1142 | |
1143 | hdev->started = true; | |
1144 | ||
d5970055 MT |
1145 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1146 | if (r < 0) { | |
54dd9321 | 1147 | goto fail_features; |
d5970055 | 1148 | } |
24d1eb33 | 1149 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_MEM_TABLE, hdev->mem); |
d5970055 MT |
1150 | if (r < 0) { |
1151 | r = -errno; | |
54dd9321 | 1152 | goto fail_mem; |
d5970055 | 1153 | } |
d154e0ba | 1154 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1155 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1156 | vdev, |
1157 | hdev->vqs + i, | |
1158 | hdev->vq_index + i); | |
d154e0ba MT |
1159 | if (r < 0) { |
1160 | goto fail_vq; | |
1161 | } | |
1162 | } | |
1163 | ||
d5970055 | 1164 | if (hdev->log_enabled) { |
e05ca820 MT |
1165 | uint64_t log_base; |
1166 | ||
d5970055 | 1167 | hdev->log_size = vhost_get_log_size(hdev); |
309750fa JW |
1168 | hdev->log = vhost_log_get(hdev->log_size); |
1169 | log_base = (uintptr_t)hdev->log->log; | |
1170 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_LOG_BASE, | |
1171 | hdev->log_size ? &log_base : NULL); | |
d5970055 MT |
1172 | if (r < 0) { |
1173 | r = -errno; | |
54dd9321 | 1174 | goto fail_log; |
d5970055 MT |
1175 | } |
1176 | } | |
d154e0ba | 1177 | |
d5970055 | 1178 | return 0; |
54dd9321 | 1179 | fail_log: |
24bfa207 | 1180 | vhost_log_put(hdev, false); |
d5970055 MT |
1181 | fail_vq: |
1182 | while (--i >= 0) { | |
f56a1247 | 1183 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1184 | vdev, |
1185 | hdev->vqs + i, | |
1186 | hdev->vq_index + i); | |
d5970055 | 1187 | } |
a9f98bb5 | 1188 | i = hdev->nvqs; |
54dd9321 MT |
1189 | fail_mem: |
1190 | fail_features: | |
24f4fe34 MT |
1191 | |
1192 | hdev->started = false; | |
d5970055 MT |
1193 | return r; |
1194 | } | |
1195 | ||
b0b3db79 | 1196 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1197 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1198 | { | |
a9f98bb5 | 1199 | int i; |
54dd9321 | 1200 | |
d5970055 | 1201 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1202 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1203 | vdev, |
1204 | hdev->vqs + i, | |
1205 | hdev->vq_index + i); | |
d5970055 | 1206 | } |
54dd9321 | 1207 | |
309750fa | 1208 | vhost_log_put(hdev, true); |
d5970055 | 1209 | hdev->started = false; |
c1be973a | 1210 | hdev->log = NULL; |
d5970055 MT |
1211 | hdev->log_size = 0; |
1212 | } | |
a9f98bb5 | 1213 |