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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" |
11078ae3 | 20 | #include <linux/vhost.h> |
022c62cb | 21 | #include "exec/address-spaces.h" |
1c819449 | 22 | #include "hw/virtio/virtio-bus.h" |
7145872e | 23 | #include "migration/migration.h" |
d5970055 MT |
24 | |
25 | static void vhost_dev_sync_region(struct vhost_dev *dev, | |
2817b260 | 26 | MemoryRegionSection *section, |
d5970055 MT |
27 | uint64_t mfirst, uint64_t mlast, |
28 | uint64_t rfirst, uint64_t rlast) | |
29 | { | |
30 | uint64_t start = MAX(mfirst, rfirst); | |
31 | uint64_t end = MIN(mlast, rlast); | |
32 | vhost_log_chunk_t *from = dev->log + start / VHOST_LOG_CHUNK; | |
33 | vhost_log_chunk_t *to = dev->log + end / VHOST_LOG_CHUNK + 1; | |
34 | uint64_t addr = (start / VHOST_LOG_CHUNK) * VHOST_LOG_CHUNK; | |
35 | ||
d5970055 MT |
36 | if (end < start) { |
37 | return; | |
38 | } | |
e314672a | 39 | assert(end / VHOST_LOG_CHUNK < dev->log_size); |
fbbaf9ae | 40 | assert(start / VHOST_LOG_CHUNK < dev->log_size); |
e314672a | 41 | |
d5970055 MT |
42 | for (;from < to; ++from) { |
43 | vhost_log_chunk_t log; | |
d5970055 MT |
44 | /* We first check with non-atomic: much cheaper, |
45 | * and we expect non-dirty to be the common case. */ | |
46 | if (!*from) { | |
0c600ce2 | 47 | addr += VHOST_LOG_CHUNK; |
d5970055 MT |
48 | continue; |
49 | } | |
5444e768 PB |
50 | /* Data must be read atomically. We don't really need barrier semantics |
51 | * but it's easier to use atomic_* than roll our own. */ | |
52 | log = atomic_xchg(from, 0); | |
747eb78b NC |
53 | while (log) { |
54 | int bit = ctzl(log); | |
6b37a23d MT |
55 | hwaddr page_addr; |
56 | hwaddr section_offset; | |
57 | hwaddr mr_offset; | |
6b37a23d MT |
58 | page_addr = addr + bit * VHOST_LOG_PAGE; |
59 | section_offset = page_addr - section->offset_within_address_space; | |
60 | mr_offset = section_offset + section->offset_within_region; | |
61 | memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); | |
d5970055 MT |
62 | log &= ~(0x1ull << bit); |
63 | } | |
64 | addr += VHOST_LOG_CHUNK; | |
65 | } | |
66 | } | |
67 | ||
04097f7c | 68 | static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
2817b260 | 69 | MemoryRegionSection *section, |
6b37a23d MT |
70 | hwaddr first, |
71 | hwaddr last) | |
d5970055 | 72 | { |
d5970055 | 73 | int i; |
6b37a23d MT |
74 | hwaddr start_addr; |
75 | hwaddr end_addr; | |
04097f7c | 76 | |
d5970055 MT |
77 | if (!dev->log_enabled || !dev->started) { |
78 | return 0; | |
79 | } | |
6b37a23d | 80 | start_addr = section->offset_within_address_space; |
052e87b0 | 81 | end_addr = range_get_last(start_addr, int128_get64(section->size)); |
6b37a23d MT |
82 | start_addr = MAX(first, start_addr); |
83 | end_addr = MIN(last, end_addr); | |
84 | ||
d5970055 MT |
85 | for (i = 0; i < dev->mem->nregions; ++i) { |
86 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
2817b260 | 87 | vhost_dev_sync_region(dev, section, start_addr, end_addr, |
d5970055 MT |
88 | reg->guest_phys_addr, |
89 | range_get_last(reg->guest_phys_addr, | |
90 | reg->memory_size)); | |
91 | } | |
92 | for (i = 0; i < dev->nvqs; ++i) { | |
93 | struct vhost_virtqueue *vq = dev->vqs + i; | |
2817b260 | 94 | vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
d5970055 MT |
95 | range_get_last(vq->used_phys, vq->used_size)); |
96 | } | |
97 | return 0; | |
98 | } | |
99 | ||
04097f7c AK |
100 | static void vhost_log_sync(MemoryListener *listener, |
101 | MemoryRegionSection *section) | |
102 | { | |
103 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
104 | memory_listener); | |
6b37a23d MT |
105 | vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
106 | } | |
04097f7c | 107 | |
6b37a23d MT |
108 | static void vhost_log_sync_range(struct vhost_dev *dev, |
109 | hwaddr first, hwaddr last) | |
110 | { | |
111 | int i; | |
112 | /* FIXME: this is N^2 in number of sections */ | |
113 | for (i = 0; i < dev->n_mem_sections; ++i) { | |
114 | MemoryRegionSection *section = &dev->mem_sections[i]; | |
115 | vhost_sync_dirty_bitmap(dev, section, first, last); | |
116 | } | |
04097f7c AK |
117 | } |
118 | ||
d5970055 MT |
119 | /* Assign/unassign. Keep an unsorted array of non-overlapping |
120 | * memory regions in dev->mem. */ | |
121 | static void vhost_dev_unassign_memory(struct vhost_dev *dev, | |
122 | uint64_t start_addr, | |
123 | uint64_t size) | |
124 | { | |
125 | int from, to, n = dev->mem->nregions; | |
126 | /* Track overlapping/split regions for sanity checking. */ | |
127 | int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0; | |
128 | ||
129 | for (from = 0, to = 0; from < n; ++from, ++to) { | |
130 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
131 | uint64_t reglast; | |
132 | uint64_t memlast; | |
133 | uint64_t change; | |
134 | ||
135 | /* clone old region */ | |
136 | if (to != from) { | |
137 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
138 | } | |
139 | ||
140 | /* No overlap is simple */ | |
141 | if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
142 | start_addr, size)) { | |
143 | continue; | |
144 | } | |
145 | ||
146 | /* Split only happens if supplied region | |
147 | * is in the middle of an existing one. Thus it can not | |
148 | * overlap with any other existing region. */ | |
149 | assert(!split); | |
150 | ||
151 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
152 | memlast = range_get_last(start_addr, size); | |
153 | ||
154 | /* Remove whole region */ | |
155 | if (start_addr <= reg->guest_phys_addr && memlast >= reglast) { | |
156 | --dev->mem->nregions; | |
157 | --to; | |
d5970055 MT |
158 | ++overlap_middle; |
159 | continue; | |
160 | } | |
161 | ||
162 | /* Shrink region */ | |
163 | if (memlast >= reglast) { | |
164 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
165 | assert(reg->memory_size); | |
166 | assert(!overlap_end); | |
167 | ++overlap_end; | |
168 | continue; | |
169 | } | |
170 | ||
171 | /* Shift region */ | |
172 | if (start_addr <= reg->guest_phys_addr) { | |
173 | change = memlast + 1 - reg->guest_phys_addr; | |
174 | reg->memory_size -= change; | |
175 | reg->guest_phys_addr += change; | |
176 | reg->userspace_addr += change; | |
177 | assert(reg->memory_size); | |
178 | assert(!overlap_start); | |
179 | ++overlap_start; | |
180 | continue; | |
181 | } | |
182 | ||
183 | /* This only happens if supplied region | |
184 | * is in the middle of an existing one. Thus it can not | |
185 | * overlap with any other existing region. */ | |
186 | assert(!overlap_start); | |
187 | assert(!overlap_end); | |
188 | assert(!overlap_middle); | |
189 | /* Split region: shrink first part, shift second part. */ | |
190 | memcpy(dev->mem->regions + n, reg, sizeof *reg); | |
191 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
192 | assert(reg->memory_size); | |
193 | change = memlast + 1 - reg->guest_phys_addr; | |
194 | reg = dev->mem->regions + n; | |
195 | reg->memory_size -= change; | |
196 | assert(reg->memory_size); | |
197 | reg->guest_phys_addr += change; | |
198 | reg->userspace_addr += change; | |
199 | /* Never add more than 1 region */ | |
200 | assert(dev->mem->nregions == n); | |
201 | ++dev->mem->nregions; | |
202 | ++split; | |
203 | } | |
204 | } | |
205 | ||
206 | /* Called after unassign, so no regions overlap the given range. */ | |
207 | static void vhost_dev_assign_memory(struct vhost_dev *dev, | |
208 | uint64_t start_addr, | |
209 | uint64_t size, | |
210 | uint64_t uaddr) | |
211 | { | |
212 | int from, to; | |
213 | struct vhost_memory_region *merged = NULL; | |
214 | for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) { | |
215 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
216 | uint64_t prlast, urlast; | |
217 | uint64_t pmlast, umlast; | |
218 | uint64_t s, e, u; | |
219 | ||
220 | /* clone old region */ | |
221 | if (to != from) { | |
222 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
223 | } | |
224 | prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
225 | pmlast = range_get_last(start_addr, size); | |
226 | urlast = range_get_last(reg->userspace_addr, reg->memory_size); | |
227 | umlast = range_get_last(uaddr, size); | |
228 | ||
229 | /* check for overlapping regions: should never happen. */ | |
230 | assert(prlast < start_addr || pmlast < reg->guest_phys_addr); | |
231 | /* Not an adjacent or overlapping region - do not merge. */ | |
232 | if ((prlast + 1 != start_addr || urlast + 1 != uaddr) && | |
233 | (pmlast + 1 != reg->guest_phys_addr || | |
234 | umlast + 1 != reg->userspace_addr)) { | |
235 | continue; | |
236 | } | |
237 | ||
238 | if (merged) { | |
239 | --to; | |
240 | assert(to >= 0); | |
241 | } else { | |
242 | merged = reg; | |
243 | } | |
244 | u = MIN(uaddr, reg->userspace_addr); | |
245 | s = MIN(start_addr, reg->guest_phys_addr); | |
246 | e = MAX(pmlast, prlast); | |
247 | uaddr = merged->userspace_addr = u; | |
248 | start_addr = merged->guest_phys_addr = s; | |
249 | size = merged->memory_size = e - s + 1; | |
250 | assert(merged->memory_size); | |
251 | } | |
252 | ||
253 | if (!merged) { | |
254 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
255 | memset(reg, 0, sizeof *reg); | |
256 | reg->memory_size = size; | |
257 | assert(reg->memory_size); | |
258 | reg->guest_phys_addr = start_addr; | |
259 | reg->userspace_addr = uaddr; | |
260 | ++to; | |
261 | } | |
262 | assert(to <= dev->mem->nregions + 1); | |
263 | dev->mem->nregions = to; | |
264 | } | |
265 | ||
266 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) | |
267 | { | |
268 | uint64_t log_size = 0; | |
269 | int i; | |
270 | for (i = 0; i < dev->mem->nregions; ++i) { | |
271 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
272 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
273 | reg->memory_size); | |
274 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
275 | } | |
276 | for (i = 0; i < dev->nvqs; ++i) { | |
277 | struct vhost_virtqueue *vq = dev->vqs + i; | |
278 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
279 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
280 | } | |
281 | return log_size; | |
282 | } | |
283 | ||
284 | static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size) | |
285 | { | |
286 | vhost_log_chunk_t *log; | |
287 | uint64_t log_base; | |
6b37a23d | 288 | int r; |
6528499f MA |
289 | |
290 | log = g_malloc0(size * sizeof *log); | |
d5970055 | 291 | log_base = (uint64_t)(unsigned long)log; |
24d1eb33 | 292 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_LOG_BASE, &log_base); |
d5970055 | 293 | assert(r >= 0); |
6b37a23d MT |
294 | /* Sync only the range covered by the old log */ |
295 | if (dev->log_size) { | |
296 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
2817b260 | 297 | } |
9e288406 | 298 | g_free(dev->log); |
d5970055 MT |
299 | dev->log = log; |
300 | dev->log_size = size; | |
301 | } | |
302 | ||
303 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, | |
304 | uint64_t start_addr, | |
305 | uint64_t size) | |
306 | { | |
307 | int i; | |
8617343f MT |
308 | int r = 0; |
309 | ||
310 | for (i = 0; !r && i < dev->nvqs; ++i) { | |
d5970055 | 311 | struct vhost_virtqueue *vq = dev->vqs + i; |
a8170e5e | 312 | hwaddr l; |
d5970055 MT |
313 | void *p; |
314 | ||
315 | if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) { | |
316 | continue; | |
317 | } | |
318 | l = vq->ring_size; | |
319 | p = cpu_physical_memory_map(vq->ring_phys, &l, 1); | |
320 | if (!p || l != vq->ring_size) { | |
321 | fprintf(stderr, "Unable to map ring buffer for ring %d\n", i); | |
8617343f | 322 | r = -ENOMEM; |
d5970055 MT |
323 | } |
324 | if (p != vq->ring) { | |
325 | fprintf(stderr, "Ring buffer relocated for ring %d\n", i); | |
8617343f | 326 | r = -EBUSY; |
d5970055 MT |
327 | } |
328 | cpu_physical_memory_unmap(p, l, 0, 0); | |
329 | } | |
8617343f | 330 | return r; |
d5970055 MT |
331 | } |
332 | ||
4e789564 MT |
333 | static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
334 | uint64_t start_addr, | |
335 | uint64_t size) | |
336 | { | |
337 | int i, n = dev->mem->nregions; | |
338 | for (i = 0; i < n; ++i) { | |
339 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
340 | if (ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
341 | start_addr, size)) { | |
342 | return reg; | |
343 | } | |
344 | } | |
345 | return NULL; | |
346 | } | |
347 | ||
348 | static bool vhost_dev_cmp_memory(struct vhost_dev *dev, | |
349 | uint64_t start_addr, | |
350 | uint64_t size, | |
351 | uint64_t uaddr) | |
352 | { | |
353 | struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size); | |
354 | uint64_t reglast; | |
355 | uint64_t memlast; | |
356 | ||
357 | if (!reg) { | |
358 | return true; | |
359 | } | |
360 | ||
361 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
362 | memlast = range_get_last(start_addr, size); | |
363 | ||
364 | /* Need to extend region? */ | |
365 | if (start_addr < reg->guest_phys_addr || memlast > reglast) { | |
366 | return true; | |
367 | } | |
368 | /* userspace_addr changed? */ | |
369 | return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr; | |
370 | } | |
371 | ||
04097f7c AK |
372 | static void vhost_set_memory(MemoryListener *listener, |
373 | MemoryRegionSection *section, | |
374 | bool add) | |
d5970055 | 375 | { |
04097f7c AK |
376 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
377 | memory_listener); | |
a8170e5e | 378 | hwaddr start_addr = section->offset_within_address_space; |
052e87b0 | 379 | ram_addr_t size = int128_get64(section->size); |
04097f7c | 380 | bool log_dirty = memory_region_is_logging(section->mr); |
d5970055 MT |
381 | int s = offsetof(struct vhost_memory, regions) + |
382 | (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; | |
04097f7c AK |
383 | void *ram; |
384 | ||
7267c094 | 385 | dev->mem = g_realloc(dev->mem, s); |
d5970055 | 386 | |
f5a4e64f | 387 | if (log_dirty) { |
04097f7c | 388 | add = false; |
f5a4e64f MT |
389 | } |
390 | ||
d5970055 MT |
391 | assert(size); |
392 | ||
4e789564 | 393 | /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */ |
d743c382 | 394 | ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
04097f7c AK |
395 | if (add) { |
396 | if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) { | |
4e789564 MT |
397 | /* Region exists with same address. Nothing to do. */ |
398 | return; | |
399 | } | |
400 | } else { | |
401 | if (!vhost_dev_find_reg(dev, start_addr, size)) { | |
402 | /* Removing region that we don't access. Nothing to do. */ | |
403 | return; | |
404 | } | |
405 | } | |
406 | ||
d5970055 | 407 | vhost_dev_unassign_memory(dev, start_addr, size); |
04097f7c | 408 | if (add) { |
d5970055 | 409 | /* Add given mapping, merging adjacent regions if any */ |
04097f7c | 410 | vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
d5970055 MT |
411 | } else { |
412 | /* Remove old mapping for this memory, if any. */ | |
413 | vhost_dev_unassign_memory(dev, start_addr, size); | |
414 | } | |
af603142 NB |
415 | dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); |
416 | dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); | |
417 | dev->memory_changed = true; | |
418 | } | |
419 | ||
420 | static bool vhost_section(MemoryRegionSection *section) | |
421 | { | |
422 | return memory_region_is_ram(section->mr); | |
423 | } | |
424 | ||
425 | static void vhost_begin(MemoryListener *listener) | |
426 | { | |
427 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
428 | memory_listener); | |
429 | dev->mem_changed_end_addr = 0; | |
430 | dev->mem_changed_start_addr = -1; | |
431 | } | |
d5970055 | 432 | |
af603142 NB |
433 | static void vhost_commit(MemoryListener *listener) |
434 | { | |
435 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
436 | memory_listener); | |
437 | hwaddr start_addr = 0; | |
438 | ram_addr_t size = 0; | |
439 | uint64_t log_size; | |
440 | int r; | |
441 | ||
442 | if (!dev->memory_changed) { | |
443 | return; | |
444 | } | |
d5970055 MT |
445 | if (!dev->started) { |
446 | return; | |
447 | } | |
af603142 NB |
448 | if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { |
449 | return; | |
450 | } | |
d5970055 MT |
451 | |
452 | if (dev->started) { | |
af603142 NB |
453 | start_addr = dev->mem_changed_start_addr; |
454 | size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; | |
455 | ||
d5970055 MT |
456 | r = vhost_verify_ring_mappings(dev, start_addr, size); |
457 | assert(r >= 0); | |
458 | } | |
459 | ||
460 | if (!dev->log_enabled) { | |
24d1eb33 | 461 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_MEM_TABLE, dev->mem); |
d5970055 | 462 | assert(r >= 0); |
af603142 | 463 | dev->memory_changed = false; |
d5970055 MT |
464 | return; |
465 | } | |
466 | log_size = vhost_get_log_size(dev); | |
467 | /* We allocate an extra 4K bytes to log, | |
468 | * to reduce the * number of reallocations. */ | |
469 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
470 | /* To log more, must increase log size before table update. */ | |
471 | if (dev->log_size < log_size) { | |
472 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
473 | } | |
24d1eb33 | 474 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_MEM_TABLE, dev->mem); |
d5970055 MT |
475 | assert(r >= 0); |
476 | /* To log less, can only decrease log size after table update. */ | |
477 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
478 | vhost_dev_log_resize(dev, log_size); | |
479 | } | |
af603142 | 480 | dev->memory_changed = false; |
50c1e149 AK |
481 | } |
482 | ||
04097f7c AK |
483 | static void vhost_region_add(MemoryListener *listener, |
484 | MemoryRegionSection *section) | |
485 | { | |
2817b260 AK |
486 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
487 | memory_listener); | |
488 | ||
c49450b9 AK |
489 | if (!vhost_section(section)) { |
490 | return; | |
491 | } | |
492 | ||
2817b260 AK |
493 | ++dev->n_mem_sections; |
494 | dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, | |
495 | dev->n_mem_sections); | |
496 | dev->mem_sections[dev->n_mem_sections - 1] = *section; | |
dfde4e6e | 497 | memory_region_ref(section->mr); |
04097f7c AK |
498 | vhost_set_memory(listener, section, true); |
499 | } | |
500 | ||
501 | static void vhost_region_del(MemoryListener *listener, | |
502 | MemoryRegionSection *section) | |
503 | { | |
2817b260 AK |
504 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
505 | memory_listener); | |
506 | int i; | |
507 | ||
c49450b9 AK |
508 | if (!vhost_section(section)) { |
509 | return; | |
510 | } | |
511 | ||
04097f7c | 512 | vhost_set_memory(listener, section, false); |
dfde4e6e | 513 | memory_region_unref(section->mr); |
2817b260 AK |
514 | for (i = 0; i < dev->n_mem_sections; ++i) { |
515 | if (dev->mem_sections[i].offset_within_address_space | |
516 | == section->offset_within_address_space) { | |
517 | --dev->n_mem_sections; | |
518 | memmove(&dev->mem_sections[i], &dev->mem_sections[i+1], | |
637f7a6a | 519 | (dev->n_mem_sections - i) * sizeof(*dev->mem_sections)); |
2817b260 AK |
520 | break; |
521 | } | |
522 | } | |
04097f7c AK |
523 | } |
524 | ||
50c1e149 AK |
525 | static void vhost_region_nop(MemoryListener *listener, |
526 | MemoryRegionSection *section) | |
527 | { | |
528 | } | |
529 | ||
d5970055 MT |
530 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
531 | struct vhost_virtqueue *vq, | |
532 | unsigned idx, bool enable_log) | |
533 | { | |
534 | struct vhost_vring_addr addr = { | |
535 | .index = idx, | |
2b3af999 SW |
536 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
537 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
538 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
539 | .log_guest_addr = vq->used_phys, |
540 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
541 | }; | |
24d1eb33 | 542 | int r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_ADDR, &addr); |
d5970055 MT |
543 | if (r < 0) { |
544 | return -errno; | |
545 | } | |
546 | return 0; | |
547 | } | |
548 | ||
549 | static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) | |
550 | { | |
551 | uint64_t features = dev->acked_features; | |
552 | int r; | |
553 | if (enable_log) { | |
554 | features |= 0x1 << VHOST_F_LOG_ALL; | |
555 | } | |
24d1eb33 | 556 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_FEATURES, &features); |
d5970055 MT |
557 | return r < 0 ? -errno : 0; |
558 | } | |
559 | ||
560 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
561 | { | |
562 | int r, t, i; | |
563 | r = vhost_dev_set_features(dev, enable_log); | |
564 | if (r < 0) { | |
565 | goto err_features; | |
566 | } | |
567 | for (i = 0; i < dev->nvqs; ++i) { | |
568 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
569 | enable_log); | |
570 | if (r < 0) { | |
571 | goto err_vq; | |
572 | } | |
573 | } | |
574 | return 0; | |
575 | err_vq: | |
576 | for (; i >= 0; --i) { | |
577 | t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
578 | dev->log_enabled); | |
579 | assert(t >= 0); | |
580 | } | |
581 | t = vhost_dev_set_features(dev, dev->log_enabled); | |
582 | assert(t >= 0); | |
583 | err_features: | |
584 | return r; | |
585 | } | |
586 | ||
04097f7c | 587 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 588 | { |
04097f7c AK |
589 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
590 | memory_listener); | |
d5970055 MT |
591 | int r; |
592 | if (!!enable == dev->log_enabled) { | |
593 | return 0; | |
594 | } | |
595 | if (!dev->started) { | |
596 | dev->log_enabled = enable; | |
597 | return 0; | |
598 | } | |
599 | if (!enable) { | |
600 | r = vhost_dev_set_log(dev, false); | |
601 | if (r < 0) { | |
602 | return r; | |
603 | } | |
9e288406 | 604 | g_free(dev->log); |
d5970055 MT |
605 | dev->log = NULL; |
606 | dev->log_size = 0; | |
607 | } else { | |
608 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
609 | r = vhost_dev_set_log(dev, true); | |
610 | if (r < 0) { | |
611 | return r; | |
612 | } | |
613 | } | |
614 | dev->log_enabled = enable; | |
615 | return 0; | |
616 | } | |
617 | ||
04097f7c AK |
618 | static void vhost_log_global_start(MemoryListener *listener) |
619 | { | |
620 | int r; | |
621 | ||
622 | r = vhost_migration_log(listener, true); | |
623 | if (r < 0) { | |
624 | abort(); | |
625 | } | |
626 | } | |
627 | ||
628 | static void vhost_log_global_stop(MemoryListener *listener) | |
629 | { | |
630 | int r; | |
631 | ||
632 | r = vhost_migration_log(listener, false); | |
633 | if (r < 0) { | |
634 | abort(); | |
635 | } | |
636 | } | |
637 | ||
638 | static void vhost_log_start(MemoryListener *listener, | |
639 | MemoryRegionSection *section) | |
640 | { | |
641 | /* FIXME: implement */ | |
642 | } | |
643 | ||
644 | static void vhost_log_stop(MemoryListener *listener, | |
645 | MemoryRegionSection *section) | |
646 | { | |
647 | /* FIXME: implement */ | |
648 | } | |
649 | ||
f56a1247 | 650 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
651 | struct VirtIODevice *vdev, |
652 | struct vhost_virtqueue *vq, | |
653 | unsigned idx) | |
654 | { | |
a8170e5e | 655 | hwaddr s, l, a; |
d5970055 | 656 | int r; |
a9f98bb5 | 657 | int vhost_vq_index = idx - dev->vq_index; |
d5970055 | 658 | struct vhost_vring_file file = { |
a9f98bb5 | 659 | .index = vhost_vq_index |
d5970055 MT |
660 | }; |
661 | struct vhost_vring_state state = { | |
a9f98bb5 | 662 | .index = vhost_vq_index |
d5970055 MT |
663 | }; |
664 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
665 | ||
a9f98bb5 JW |
666 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
667 | ||
d5970055 | 668 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
24d1eb33 | 669 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_NUM, &state); |
d5970055 MT |
670 | if (r) { |
671 | return -errno; | |
672 | } | |
673 | ||
674 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
24d1eb33 | 675 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_BASE, &state); |
d5970055 MT |
676 | if (r) { |
677 | return -errno; | |
678 | } | |
679 | ||
680 | s = l = virtio_queue_get_desc_size(vdev, idx); | |
681 | a = virtio_queue_get_desc_addr(vdev, idx); | |
682 | vq->desc = cpu_physical_memory_map(a, &l, 0); | |
683 | if (!vq->desc || l != s) { | |
684 | r = -ENOMEM; | |
685 | goto fail_alloc_desc; | |
686 | } | |
687 | s = l = virtio_queue_get_avail_size(vdev, idx); | |
688 | a = virtio_queue_get_avail_addr(vdev, idx); | |
689 | vq->avail = cpu_physical_memory_map(a, &l, 0); | |
690 | if (!vq->avail || l != s) { | |
691 | r = -ENOMEM; | |
692 | goto fail_alloc_avail; | |
693 | } | |
694 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
695 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
696 | vq->used = cpu_physical_memory_map(a, &l, 1); | |
697 | if (!vq->used || l != s) { | |
698 | r = -ENOMEM; | |
699 | goto fail_alloc_used; | |
700 | } | |
701 | ||
702 | vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); | |
703 | vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); | |
704 | vq->ring = cpu_physical_memory_map(a, &l, 1); | |
705 | if (!vq->ring || l != s) { | |
706 | r = -ENOMEM; | |
707 | goto fail_alloc_ring; | |
708 | } | |
709 | ||
a9f98bb5 | 710 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
711 | if (r < 0) { |
712 | r = -errno; | |
713 | goto fail_alloc; | |
714 | } | |
a9f98bb5 | 715 | |
d5970055 | 716 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
24d1eb33 | 717 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_KICK, &file); |
d5970055 | 718 | if (r) { |
c8852121 | 719 | r = -errno; |
d5970055 MT |
720 | goto fail_kick; |
721 | } | |
722 | ||
f56a1247 MT |
723 | /* Clear and discard previous events if any. */ |
724 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 MT |
725 | |
726 | return 0; | |
727 | ||
d5970055 | 728 | fail_kick: |
d5970055 MT |
729 | fail_alloc: |
730 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
731 | 0, 0); | |
732 | fail_alloc_ring: | |
733 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
734 | 0, 0); | |
735 | fail_alloc_used: | |
736 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
737 | 0, 0); | |
738 | fail_alloc_avail: | |
739 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
740 | 0, 0); | |
741 | fail_alloc_desc: | |
742 | return r; | |
743 | } | |
744 | ||
f56a1247 | 745 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
746 | struct VirtIODevice *vdev, |
747 | struct vhost_virtqueue *vq, | |
748 | unsigned idx) | |
749 | { | |
750 | struct vhost_vring_state state = { | |
a9f98bb5 | 751 | .index = idx - dev->vq_index |
d5970055 MT |
752 | }; |
753 | int r; | |
a9f98bb5 | 754 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
24d1eb33 | 755 | r = dev->vhost_ops->vhost_call(dev, VHOST_GET_VRING_BASE, &state); |
d5970055 MT |
756 | if (r < 0) { |
757 | fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r); | |
758 | fflush(stderr); | |
759 | } | |
760 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
3561ba14 | 761 | virtio_queue_invalidate_signalled_used(vdev, idx); |
d5970055 MT |
762 | assert (r >= 0); |
763 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
764 | 0, virtio_queue_get_ring_size(vdev, idx)); | |
765 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
766 | 1, virtio_queue_get_used_size(vdev, idx)); | |
767 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
768 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
769 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
770 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
771 | } | |
772 | ||
80a1ea37 AK |
773 | static void vhost_eventfd_add(MemoryListener *listener, |
774 | MemoryRegionSection *section, | |
753d5e14 | 775 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
776 | { |
777 | } | |
778 | ||
779 | static void vhost_eventfd_del(MemoryListener *listener, | |
780 | MemoryRegionSection *section, | |
753d5e14 | 781 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
782 | { |
783 | } | |
784 | ||
f56a1247 MT |
785 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
786 | struct vhost_virtqueue *vq, int n) | |
787 | { | |
788 | struct vhost_vring_file file = { | |
789 | .index = n, | |
790 | }; | |
791 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
792 | if (r < 0) { | |
793 | return r; | |
794 | } | |
795 | ||
796 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
24d1eb33 | 797 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_CALL, &file); |
f56a1247 MT |
798 | if (r) { |
799 | r = -errno; | |
800 | goto fail_call; | |
801 | } | |
802 | return 0; | |
803 | fail_call: | |
804 | event_notifier_cleanup(&vq->masked_notifier); | |
805 | return r; | |
806 | } | |
807 | ||
808 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
809 | { | |
810 | event_notifier_cleanup(&vq->masked_notifier); | |
811 | } | |
812 | ||
81647a65 | 813 | int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
1a1bfac9 | 814 | VhostBackendType backend_type, bool force) |
d5970055 MT |
815 | { |
816 | uint64_t features; | |
f56a1247 | 817 | int i, r; |
81647a65 | 818 | |
1a1bfac9 NN |
819 | if (vhost_set_backend_type(hdev, backend_type) < 0) { |
820 | return -1; | |
821 | } | |
822 | ||
24d1eb33 NN |
823 | if (hdev->vhost_ops->vhost_backend_init(hdev, opaque) < 0) { |
824 | return -errno; | |
825 | } | |
826 | ||
827 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_OWNER, NULL); | |
d5970055 MT |
828 | if (r < 0) { |
829 | goto fail; | |
830 | } | |
831 | ||
24d1eb33 | 832 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_GET_FEATURES, &features); |
d5970055 MT |
833 | if (r < 0) { |
834 | goto fail; | |
835 | } | |
f56a1247 MT |
836 | |
837 | for (i = 0; i < hdev->nvqs; ++i) { | |
838 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, i); | |
839 | if (r < 0) { | |
840 | goto fail_vq; | |
841 | } | |
842 | } | |
d5970055 MT |
843 | hdev->features = features; |
844 | ||
04097f7c | 845 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
846 | .begin = vhost_begin, |
847 | .commit = vhost_commit, | |
04097f7c AK |
848 | .region_add = vhost_region_add, |
849 | .region_del = vhost_region_del, | |
50c1e149 | 850 | .region_nop = vhost_region_nop, |
04097f7c AK |
851 | .log_start = vhost_log_start, |
852 | .log_stop = vhost_log_stop, | |
853 | .log_sync = vhost_log_sync, | |
854 | .log_global_start = vhost_log_global_start, | |
855 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
856 | .eventfd_add = vhost_eventfd_add, |
857 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 858 | .priority = 10 |
04097f7c | 859 | }; |
7145872e MT |
860 | hdev->migration_blocker = NULL; |
861 | if (!(hdev->features & (0x1 << VHOST_F_LOG_ALL))) { | |
862 | error_setg(&hdev->migration_blocker, | |
863 | "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); | |
864 | migrate_add_blocker(hdev->migration_blocker); | |
865 | } | |
7267c094 | 866 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
867 | hdev->n_mem_sections = 0; |
868 | hdev->mem_sections = NULL; | |
d5970055 MT |
869 | hdev->log = NULL; |
870 | hdev->log_size = 0; | |
871 | hdev->log_enabled = false; | |
872 | hdev->started = false; | |
af603142 | 873 | hdev->memory_changed = false; |
f6790af6 | 874 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
5430a28f | 875 | hdev->force = force; |
d5970055 | 876 | return 0; |
f56a1247 MT |
877 | fail_vq: |
878 | while (--i >= 0) { | |
879 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
880 | } | |
d5970055 MT |
881 | fail: |
882 | r = -errno; | |
24d1eb33 | 883 | hdev->vhost_ops->vhost_backend_cleanup(hdev); |
d5970055 MT |
884 | return r; |
885 | } | |
886 | ||
887 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
888 | { | |
f56a1247 MT |
889 | int i; |
890 | for (i = 0; i < hdev->nvqs; ++i) { | |
891 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
892 | } | |
04097f7c | 893 | memory_listener_unregister(&hdev->memory_listener); |
7145872e MT |
894 | if (hdev->migration_blocker) { |
895 | migrate_del_blocker(hdev->migration_blocker); | |
896 | error_free(hdev->migration_blocker); | |
897 | } | |
7267c094 | 898 | g_free(hdev->mem); |
2817b260 | 899 | g_free(hdev->mem_sections); |
24d1eb33 | 900 | hdev->vhost_ops->vhost_backend_cleanup(hdev); |
d5970055 MT |
901 | } |
902 | ||
5430a28f MT |
903 | bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev) |
904 | { | |
1c819449 FK |
905 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
906 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
907 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
908 | ||
909 | return !k->query_guest_notifiers || | |
910 | k->query_guest_notifiers(qbus->parent) || | |
911 | hdev->force; | |
5430a28f MT |
912 | } |
913 | ||
b0b3db79 MT |
914 | /* Stop processing guest IO notifications in qemu. |
915 | * Start processing them in vhost in kernel. | |
916 | */ | |
917 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
918 | { | |
1c819449 FK |
919 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
920 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
921 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 | 922 | int i, r; |
1c819449 | 923 | if (!k->set_host_notifier) { |
b0b3db79 MT |
924 | fprintf(stderr, "binding does not support host notifiers\n"); |
925 | r = -ENOSYS; | |
926 | goto fail; | |
927 | } | |
928 | ||
929 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 930 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, true); |
b0b3db79 MT |
931 | if (r < 0) { |
932 | fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r); | |
933 | goto fail_vq; | |
934 | } | |
935 | } | |
936 | ||
937 | return 0; | |
938 | fail_vq: | |
939 | while (--i >= 0) { | |
1c819449 | 940 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
941 | if (r < 0) { |
942 | fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r); | |
943 | fflush(stderr); | |
944 | } | |
945 | assert (r >= 0); | |
946 | } | |
947 | fail: | |
948 | return r; | |
949 | } | |
950 | ||
951 | /* Stop processing guest IO notifications in vhost. | |
952 | * Start processing them in qemu. | |
953 | * This might actually run the qemu handlers right away, | |
954 | * so virtio in qemu must be completely setup when this is called. | |
955 | */ | |
956 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
957 | { | |
1c819449 FK |
958 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
959 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
960 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 MT |
961 | int i, r; |
962 | ||
963 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 964 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
965 | if (r < 0) { |
966 | fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r); | |
967 | fflush(stderr); | |
968 | } | |
969 | assert (r >= 0); | |
970 | } | |
971 | } | |
972 | ||
f56a1247 MT |
973 | /* Test and clear event pending status. |
974 | * Should be called after unmask to avoid losing events. | |
975 | */ | |
976 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
977 | { | |
a9f98bb5 | 978 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
a9f98bb5 | 979 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
980 | return event_notifier_test_and_clear(&vq->masked_notifier); |
981 | } | |
982 | ||
983 | /* Mask/unmask events from this vq. */ | |
984 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
985 | bool mask) | |
986 | { | |
987 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 988 | int r, index = n - hdev->vq_index; |
f56a1247 | 989 | |
a9f98bb5 | 990 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
991 | |
992 | struct vhost_vring_file file = { | |
a9f98bb5 | 993 | .index = index |
f56a1247 MT |
994 | }; |
995 | if (mask) { | |
a9f98bb5 | 996 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
997 | } else { |
998 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
999 | } | |
24d1eb33 | 1000 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_VRING_CALL, &file); |
f56a1247 MT |
1001 | assert(r >= 0); |
1002 | } | |
1003 | ||
2e6d46d7 NN |
1004 | unsigned vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
1005 | unsigned features) | |
1006 | { | |
1007 | const int *bit = feature_bits; | |
1008 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
1009 | unsigned bit_mask = (1 << *bit); | |
1010 | if (!(hdev->features & bit_mask)) { | |
1011 | features &= ~bit_mask; | |
1012 | } | |
1013 | bit++; | |
1014 | } | |
1015 | return features; | |
1016 | } | |
1017 | ||
1018 | void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, | |
1019 | unsigned features) | |
1020 | { | |
1021 | const int *bit = feature_bits; | |
1022 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
1023 | unsigned bit_mask = (1 << *bit); | |
1024 | if (features & bit_mask) { | |
1025 | hdev->acked_features |= bit_mask; | |
1026 | } | |
1027 | bit++; | |
1028 | } | |
1029 | } | |
1030 | ||
b0b3db79 | 1031 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1032 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1033 | { | |
1034 | int i, r; | |
24f4fe34 MT |
1035 | |
1036 | hdev->started = true; | |
1037 | ||
d5970055 MT |
1038 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1039 | if (r < 0) { | |
54dd9321 | 1040 | goto fail_features; |
d5970055 | 1041 | } |
24d1eb33 | 1042 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_MEM_TABLE, hdev->mem); |
d5970055 MT |
1043 | if (r < 0) { |
1044 | r = -errno; | |
54dd9321 | 1045 | goto fail_mem; |
d5970055 | 1046 | } |
d154e0ba | 1047 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1048 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1049 | vdev, |
1050 | hdev->vqs + i, | |
1051 | hdev->vq_index + i); | |
d154e0ba MT |
1052 | if (r < 0) { |
1053 | goto fail_vq; | |
1054 | } | |
1055 | } | |
1056 | ||
d5970055 MT |
1057 | if (hdev->log_enabled) { |
1058 | hdev->log_size = vhost_get_log_size(hdev); | |
1059 | hdev->log = hdev->log_size ? | |
7267c094 | 1060 | g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL; |
24d1eb33 | 1061 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_LOG_BASE, hdev->log); |
d5970055 MT |
1062 | if (r < 0) { |
1063 | r = -errno; | |
54dd9321 | 1064 | goto fail_log; |
d5970055 MT |
1065 | } |
1066 | } | |
d154e0ba | 1067 | |
d5970055 | 1068 | return 0; |
54dd9321 | 1069 | fail_log: |
d5970055 MT |
1070 | fail_vq: |
1071 | while (--i >= 0) { | |
f56a1247 | 1072 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1073 | vdev, |
1074 | hdev->vqs + i, | |
1075 | hdev->vq_index + i); | |
d5970055 | 1076 | } |
a9f98bb5 | 1077 | i = hdev->nvqs; |
54dd9321 MT |
1078 | fail_mem: |
1079 | fail_features: | |
24f4fe34 MT |
1080 | |
1081 | hdev->started = false; | |
d5970055 MT |
1082 | return r; |
1083 | } | |
1084 | ||
b0b3db79 | 1085 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1086 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1087 | { | |
a9f98bb5 | 1088 | int i; |
54dd9321 | 1089 | |
d5970055 | 1090 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1091 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1092 | vdev, |
1093 | hdev->vqs + i, | |
1094 | hdev->vq_index + i); | |
d5970055 | 1095 | } |
6b37a23d | 1096 | vhost_log_sync_range(hdev, 0, ~0x0ull); |
54dd9321 | 1097 | |
d5970055 | 1098 | hdev->started = false; |
7267c094 | 1099 | g_free(hdev->log); |
c1be973a | 1100 | hdev->log = NULL; |
d5970055 MT |
1101 | hdev->log_size = 0; |
1102 | } | |
a9f98bb5 | 1103 |