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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 | ||
d5970055 | 16 | #include <sys/ioctl.h> |
0d09e41a | 17 | #include "hw/virtio/vhost.h" |
d5970055 | 18 | #include "hw/hw.h" |
5444e768 | 19 | #include "qemu/atomic.h" |
1de7afc9 | 20 | #include "qemu/range.h" |
11078ae3 | 21 | #include <linux/vhost.h> |
022c62cb | 22 | #include "exec/address-spaces.h" |
1c819449 | 23 | #include "hw/virtio/virtio-bus.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; | |
44 | int bit; | |
45 | /* We first check with non-atomic: much cheaper, | |
46 | * and we expect non-dirty to be the common case. */ | |
47 | if (!*from) { | |
0c600ce2 | 48 | addr += VHOST_LOG_CHUNK; |
d5970055 MT |
49 | continue; |
50 | } | |
5444e768 PB |
51 | /* Data must be read atomically. We don't really need barrier semantics |
52 | * but it's easier to use atomic_* than roll our own. */ | |
53 | log = atomic_xchg(from, 0); | |
d5970055 MT |
54 | while ((bit = sizeof(log) > sizeof(int) ? |
55 | ffsll(log) : ffs(log))) { | |
6b37a23d MT |
56 | hwaddr page_addr; |
57 | hwaddr section_offset; | |
58 | hwaddr mr_offset; | |
d5970055 | 59 | bit -= 1; |
6b37a23d MT |
60 | page_addr = addr + bit * VHOST_LOG_PAGE; |
61 | section_offset = page_addr - section->offset_within_address_space; | |
62 | mr_offset = section_offset + section->offset_within_region; | |
63 | memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); | |
d5970055 MT |
64 | log &= ~(0x1ull << bit); |
65 | } | |
66 | addr += VHOST_LOG_CHUNK; | |
67 | } | |
68 | } | |
69 | ||
04097f7c | 70 | static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
2817b260 | 71 | MemoryRegionSection *section, |
6b37a23d MT |
72 | hwaddr first, |
73 | hwaddr last) | |
d5970055 | 74 | { |
d5970055 | 75 | int i; |
6b37a23d MT |
76 | hwaddr start_addr; |
77 | hwaddr end_addr; | |
04097f7c | 78 | |
d5970055 MT |
79 | if (!dev->log_enabled || !dev->started) { |
80 | return 0; | |
81 | } | |
6b37a23d | 82 | start_addr = section->offset_within_address_space; |
052e87b0 | 83 | end_addr = range_get_last(start_addr, int128_get64(section->size)); |
6b37a23d MT |
84 | start_addr = MAX(first, start_addr); |
85 | end_addr = MIN(last, end_addr); | |
86 | ||
d5970055 MT |
87 | for (i = 0; i < dev->mem->nregions; ++i) { |
88 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
2817b260 | 89 | vhost_dev_sync_region(dev, section, start_addr, end_addr, |
d5970055 MT |
90 | reg->guest_phys_addr, |
91 | range_get_last(reg->guest_phys_addr, | |
92 | reg->memory_size)); | |
93 | } | |
94 | for (i = 0; i < dev->nvqs; ++i) { | |
95 | struct vhost_virtqueue *vq = dev->vqs + i; | |
2817b260 | 96 | vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
d5970055 MT |
97 | range_get_last(vq->used_phys, vq->used_size)); |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
04097f7c AK |
102 | static void vhost_log_sync(MemoryListener *listener, |
103 | MemoryRegionSection *section) | |
104 | { | |
105 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
106 | memory_listener); | |
6b37a23d MT |
107 | vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
108 | } | |
04097f7c | 109 | |
6b37a23d MT |
110 | static void vhost_log_sync_range(struct vhost_dev *dev, |
111 | hwaddr first, hwaddr last) | |
112 | { | |
113 | int i; | |
114 | /* FIXME: this is N^2 in number of sections */ | |
115 | for (i = 0; i < dev->n_mem_sections; ++i) { | |
116 | MemoryRegionSection *section = &dev->mem_sections[i]; | |
117 | vhost_sync_dirty_bitmap(dev, section, first, last); | |
118 | } | |
04097f7c AK |
119 | } |
120 | ||
d5970055 MT |
121 | /* Assign/unassign. Keep an unsorted array of non-overlapping |
122 | * memory regions in dev->mem. */ | |
123 | static void vhost_dev_unassign_memory(struct vhost_dev *dev, | |
124 | uint64_t start_addr, | |
125 | uint64_t size) | |
126 | { | |
127 | int from, to, n = dev->mem->nregions; | |
128 | /* Track overlapping/split regions for sanity checking. */ | |
129 | int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0; | |
130 | ||
131 | for (from = 0, to = 0; from < n; ++from, ++to) { | |
132 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
133 | uint64_t reglast; | |
134 | uint64_t memlast; | |
135 | uint64_t change; | |
136 | ||
137 | /* clone old region */ | |
138 | if (to != from) { | |
139 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
140 | } | |
141 | ||
142 | /* No overlap is simple */ | |
143 | if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
144 | start_addr, size)) { | |
145 | continue; | |
146 | } | |
147 | ||
148 | /* Split only happens if supplied region | |
149 | * is in the middle of an existing one. Thus it can not | |
150 | * overlap with any other existing region. */ | |
151 | assert(!split); | |
152 | ||
153 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
154 | memlast = range_get_last(start_addr, size); | |
155 | ||
156 | /* Remove whole region */ | |
157 | if (start_addr <= reg->guest_phys_addr && memlast >= reglast) { | |
158 | --dev->mem->nregions; | |
159 | --to; | |
d5970055 MT |
160 | ++overlap_middle; |
161 | continue; | |
162 | } | |
163 | ||
164 | /* Shrink region */ | |
165 | if (memlast >= reglast) { | |
166 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
167 | assert(reg->memory_size); | |
168 | assert(!overlap_end); | |
169 | ++overlap_end; | |
170 | continue; | |
171 | } | |
172 | ||
173 | /* Shift region */ | |
174 | if (start_addr <= reg->guest_phys_addr) { | |
175 | change = memlast + 1 - reg->guest_phys_addr; | |
176 | reg->memory_size -= change; | |
177 | reg->guest_phys_addr += change; | |
178 | reg->userspace_addr += change; | |
179 | assert(reg->memory_size); | |
180 | assert(!overlap_start); | |
181 | ++overlap_start; | |
182 | continue; | |
183 | } | |
184 | ||
185 | /* This only happens if supplied region | |
186 | * is in the middle of an existing one. Thus it can not | |
187 | * overlap with any other existing region. */ | |
188 | assert(!overlap_start); | |
189 | assert(!overlap_end); | |
190 | assert(!overlap_middle); | |
191 | /* Split region: shrink first part, shift second part. */ | |
192 | memcpy(dev->mem->regions + n, reg, sizeof *reg); | |
193 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
194 | assert(reg->memory_size); | |
195 | change = memlast + 1 - reg->guest_phys_addr; | |
196 | reg = dev->mem->regions + n; | |
197 | reg->memory_size -= change; | |
198 | assert(reg->memory_size); | |
199 | reg->guest_phys_addr += change; | |
200 | reg->userspace_addr += change; | |
201 | /* Never add more than 1 region */ | |
202 | assert(dev->mem->nregions == n); | |
203 | ++dev->mem->nregions; | |
204 | ++split; | |
205 | } | |
206 | } | |
207 | ||
208 | /* Called after unassign, so no regions overlap the given range. */ | |
209 | static void vhost_dev_assign_memory(struct vhost_dev *dev, | |
210 | uint64_t start_addr, | |
211 | uint64_t size, | |
212 | uint64_t uaddr) | |
213 | { | |
214 | int from, to; | |
215 | struct vhost_memory_region *merged = NULL; | |
216 | for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) { | |
217 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
218 | uint64_t prlast, urlast; | |
219 | uint64_t pmlast, umlast; | |
220 | uint64_t s, e, u; | |
221 | ||
222 | /* clone old region */ | |
223 | if (to != from) { | |
224 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
225 | } | |
226 | prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
227 | pmlast = range_get_last(start_addr, size); | |
228 | urlast = range_get_last(reg->userspace_addr, reg->memory_size); | |
229 | umlast = range_get_last(uaddr, size); | |
230 | ||
231 | /* check for overlapping regions: should never happen. */ | |
232 | assert(prlast < start_addr || pmlast < reg->guest_phys_addr); | |
233 | /* Not an adjacent or overlapping region - do not merge. */ | |
234 | if ((prlast + 1 != start_addr || urlast + 1 != uaddr) && | |
235 | (pmlast + 1 != reg->guest_phys_addr || | |
236 | umlast + 1 != reg->userspace_addr)) { | |
237 | continue; | |
238 | } | |
239 | ||
240 | if (merged) { | |
241 | --to; | |
242 | assert(to >= 0); | |
243 | } else { | |
244 | merged = reg; | |
245 | } | |
246 | u = MIN(uaddr, reg->userspace_addr); | |
247 | s = MIN(start_addr, reg->guest_phys_addr); | |
248 | e = MAX(pmlast, prlast); | |
249 | uaddr = merged->userspace_addr = u; | |
250 | start_addr = merged->guest_phys_addr = s; | |
251 | size = merged->memory_size = e - s + 1; | |
252 | assert(merged->memory_size); | |
253 | } | |
254 | ||
255 | if (!merged) { | |
256 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
257 | memset(reg, 0, sizeof *reg); | |
258 | reg->memory_size = size; | |
259 | assert(reg->memory_size); | |
260 | reg->guest_phys_addr = start_addr; | |
261 | reg->userspace_addr = uaddr; | |
262 | ++to; | |
263 | } | |
264 | assert(to <= dev->mem->nregions + 1); | |
265 | dev->mem->nregions = to; | |
266 | } | |
267 | ||
268 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) | |
269 | { | |
270 | uint64_t log_size = 0; | |
271 | int i; | |
272 | for (i = 0; i < dev->mem->nregions; ++i) { | |
273 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
274 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
275 | reg->memory_size); | |
276 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
277 | } | |
278 | for (i = 0; i < dev->nvqs; ++i) { | |
279 | struct vhost_virtqueue *vq = dev->vqs + i; | |
280 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
281 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
282 | } | |
283 | return log_size; | |
284 | } | |
285 | ||
286 | static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size) | |
287 | { | |
288 | vhost_log_chunk_t *log; | |
289 | uint64_t log_base; | |
6b37a23d | 290 | int r; |
6528499f MA |
291 | |
292 | log = g_malloc0(size * sizeof *log); | |
d5970055 MT |
293 | log_base = (uint64_t)(unsigned long)log; |
294 | r = ioctl(dev->control, VHOST_SET_LOG_BASE, &log_base); | |
295 | assert(r >= 0); | |
6b37a23d MT |
296 | /* Sync only the range covered by the old log */ |
297 | if (dev->log_size) { | |
298 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
2817b260 | 299 | } |
d5970055 | 300 | if (dev->log) { |
7267c094 | 301 | g_free(dev->log); |
d5970055 MT |
302 | } |
303 | dev->log = log; | |
304 | dev->log_size = size; | |
305 | } | |
306 | ||
307 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, | |
308 | uint64_t start_addr, | |
309 | uint64_t size) | |
310 | { | |
311 | int i; | |
312 | for (i = 0; i < dev->nvqs; ++i) { | |
313 | struct vhost_virtqueue *vq = dev->vqs + i; | |
a8170e5e | 314 | hwaddr l; |
d5970055 MT |
315 | void *p; |
316 | ||
317 | if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) { | |
318 | continue; | |
319 | } | |
320 | l = vq->ring_size; | |
321 | p = cpu_physical_memory_map(vq->ring_phys, &l, 1); | |
322 | if (!p || l != vq->ring_size) { | |
323 | fprintf(stderr, "Unable to map ring buffer for ring %d\n", i); | |
324 | return -ENOMEM; | |
325 | } | |
326 | if (p != vq->ring) { | |
327 | fprintf(stderr, "Ring buffer relocated for ring %d\n", i); | |
328 | return -EBUSY; | |
329 | } | |
330 | cpu_physical_memory_unmap(p, l, 0, 0); | |
331 | } | |
332 | return 0; | |
333 | } | |
334 | ||
4e789564 MT |
335 | static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
336 | uint64_t start_addr, | |
337 | uint64_t size) | |
338 | { | |
339 | int i, n = dev->mem->nregions; | |
340 | for (i = 0; i < n; ++i) { | |
341 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
342 | if (ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
343 | start_addr, size)) { | |
344 | return reg; | |
345 | } | |
346 | } | |
347 | return NULL; | |
348 | } | |
349 | ||
350 | static bool vhost_dev_cmp_memory(struct vhost_dev *dev, | |
351 | uint64_t start_addr, | |
352 | uint64_t size, | |
353 | uint64_t uaddr) | |
354 | { | |
355 | struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size); | |
356 | uint64_t reglast; | |
357 | uint64_t memlast; | |
358 | ||
359 | if (!reg) { | |
360 | return true; | |
361 | } | |
362 | ||
363 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
364 | memlast = range_get_last(start_addr, size); | |
365 | ||
366 | /* Need to extend region? */ | |
367 | if (start_addr < reg->guest_phys_addr || memlast > reglast) { | |
368 | return true; | |
369 | } | |
370 | /* userspace_addr changed? */ | |
371 | return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr; | |
372 | } | |
373 | ||
04097f7c AK |
374 | static void vhost_set_memory(MemoryListener *listener, |
375 | MemoryRegionSection *section, | |
376 | bool add) | |
d5970055 | 377 | { |
04097f7c AK |
378 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
379 | memory_listener); | |
a8170e5e | 380 | hwaddr start_addr = section->offset_within_address_space; |
052e87b0 | 381 | ram_addr_t size = int128_get64(section->size); |
04097f7c | 382 | bool log_dirty = memory_region_is_logging(section->mr); |
d5970055 MT |
383 | int s = offsetof(struct vhost_memory, regions) + |
384 | (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; | |
04097f7c AK |
385 | void *ram; |
386 | ||
7267c094 | 387 | dev->mem = g_realloc(dev->mem, s); |
d5970055 | 388 | |
f5a4e64f | 389 | if (log_dirty) { |
04097f7c | 390 | add = false; |
f5a4e64f MT |
391 | } |
392 | ||
d5970055 MT |
393 | assert(size); |
394 | ||
4e789564 | 395 | /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */ |
d743c382 | 396 | ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
04097f7c AK |
397 | if (add) { |
398 | if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) { | |
4e789564 MT |
399 | /* Region exists with same address. Nothing to do. */ |
400 | return; | |
401 | } | |
402 | } else { | |
403 | if (!vhost_dev_find_reg(dev, start_addr, size)) { | |
404 | /* Removing region that we don't access. Nothing to do. */ | |
405 | return; | |
406 | } | |
407 | } | |
408 | ||
d5970055 | 409 | vhost_dev_unassign_memory(dev, start_addr, size); |
04097f7c | 410 | if (add) { |
d5970055 | 411 | /* Add given mapping, merging adjacent regions if any */ |
04097f7c | 412 | vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
d5970055 MT |
413 | } else { |
414 | /* Remove old mapping for this memory, if any. */ | |
415 | vhost_dev_unassign_memory(dev, start_addr, size); | |
416 | } | |
af603142 NB |
417 | dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); |
418 | dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); | |
419 | dev->memory_changed = true; | |
420 | } | |
421 | ||
422 | static bool vhost_section(MemoryRegionSection *section) | |
423 | { | |
424 | return memory_region_is_ram(section->mr); | |
425 | } | |
426 | ||
427 | static void vhost_begin(MemoryListener *listener) | |
428 | { | |
429 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
430 | memory_listener); | |
431 | dev->mem_changed_end_addr = 0; | |
432 | dev->mem_changed_start_addr = -1; | |
433 | } | |
d5970055 | 434 | |
af603142 NB |
435 | static void vhost_commit(MemoryListener *listener) |
436 | { | |
437 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
438 | memory_listener); | |
439 | hwaddr start_addr = 0; | |
440 | ram_addr_t size = 0; | |
441 | uint64_t log_size; | |
442 | int r; | |
443 | ||
444 | if (!dev->memory_changed) { | |
445 | return; | |
446 | } | |
d5970055 MT |
447 | if (!dev->started) { |
448 | return; | |
449 | } | |
af603142 NB |
450 | if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { |
451 | return; | |
452 | } | |
d5970055 MT |
453 | |
454 | if (dev->started) { | |
af603142 NB |
455 | start_addr = dev->mem_changed_start_addr; |
456 | size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; | |
457 | ||
d5970055 MT |
458 | r = vhost_verify_ring_mappings(dev, start_addr, size); |
459 | assert(r >= 0); | |
460 | } | |
461 | ||
462 | if (!dev->log_enabled) { | |
463 | r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); | |
464 | assert(r >= 0); | |
af603142 | 465 | dev->memory_changed = false; |
d5970055 MT |
466 | return; |
467 | } | |
468 | log_size = vhost_get_log_size(dev); | |
469 | /* We allocate an extra 4K bytes to log, | |
470 | * to reduce the * number of reallocations. */ | |
471 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
472 | /* To log more, must increase log size before table update. */ | |
473 | if (dev->log_size < log_size) { | |
474 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
475 | } | |
476 | r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); | |
477 | assert(r >= 0); | |
478 | /* To log less, can only decrease log size after table update. */ | |
479 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
480 | vhost_dev_log_resize(dev, log_size); | |
481 | } | |
af603142 | 482 | dev->memory_changed = false; |
50c1e149 AK |
483 | } |
484 | ||
04097f7c AK |
485 | static void vhost_region_add(MemoryListener *listener, |
486 | MemoryRegionSection *section) | |
487 | { | |
2817b260 AK |
488 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
489 | memory_listener); | |
490 | ||
c49450b9 AK |
491 | if (!vhost_section(section)) { |
492 | return; | |
493 | } | |
494 | ||
2817b260 AK |
495 | ++dev->n_mem_sections; |
496 | dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, | |
497 | dev->n_mem_sections); | |
498 | dev->mem_sections[dev->n_mem_sections - 1] = *section; | |
dfde4e6e | 499 | memory_region_ref(section->mr); |
04097f7c AK |
500 | vhost_set_memory(listener, section, true); |
501 | } | |
502 | ||
503 | static void vhost_region_del(MemoryListener *listener, | |
504 | MemoryRegionSection *section) | |
505 | { | |
2817b260 AK |
506 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
507 | memory_listener); | |
508 | int i; | |
509 | ||
c49450b9 AK |
510 | if (!vhost_section(section)) { |
511 | return; | |
512 | } | |
513 | ||
04097f7c | 514 | vhost_set_memory(listener, section, false); |
dfde4e6e | 515 | memory_region_unref(section->mr); |
2817b260 AK |
516 | for (i = 0; i < dev->n_mem_sections; ++i) { |
517 | if (dev->mem_sections[i].offset_within_address_space | |
518 | == section->offset_within_address_space) { | |
519 | --dev->n_mem_sections; | |
520 | memmove(&dev->mem_sections[i], &dev->mem_sections[i+1], | |
637f7a6a | 521 | (dev->n_mem_sections - i) * sizeof(*dev->mem_sections)); |
2817b260 AK |
522 | break; |
523 | } | |
524 | } | |
04097f7c AK |
525 | } |
526 | ||
50c1e149 AK |
527 | static void vhost_region_nop(MemoryListener *listener, |
528 | MemoryRegionSection *section) | |
529 | { | |
530 | } | |
531 | ||
d5970055 MT |
532 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
533 | struct vhost_virtqueue *vq, | |
534 | unsigned idx, bool enable_log) | |
535 | { | |
536 | struct vhost_vring_addr addr = { | |
537 | .index = idx, | |
2b3af999 SW |
538 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
539 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
540 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
541 | .log_guest_addr = vq->used_phys, |
542 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
543 | }; | |
544 | int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr); | |
545 | if (r < 0) { | |
546 | return -errno; | |
547 | } | |
548 | return 0; | |
549 | } | |
550 | ||
551 | static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) | |
552 | { | |
553 | uint64_t features = dev->acked_features; | |
554 | int r; | |
555 | if (enable_log) { | |
556 | features |= 0x1 << VHOST_F_LOG_ALL; | |
557 | } | |
558 | r = ioctl(dev->control, VHOST_SET_FEATURES, &features); | |
559 | return r < 0 ? -errno : 0; | |
560 | } | |
561 | ||
562 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
563 | { | |
564 | int r, t, i; | |
565 | r = vhost_dev_set_features(dev, enable_log); | |
566 | if (r < 0) { | |
567 | goto err_features; | |
568 | } | |
569 | for (i = 0; i < dev->nvqs; ++i) { | |
570 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
571 | enable_log); | |
572 | if (r < 0) { | |
573 | goto err_vq; | |
574 | } | |
575 | } | |
576 | return 0; | |
577 | err_vq: | |
578 | for (; i >= 0; --i) { | |
579 | t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
580 | dev->log_enabled); | |
581 | assert(t >= 0); | |
582 | } | |
583 | t = vhost_dev_set_features(dev, dev->log_enabled); | |
584 | assert(t >= 0); | |
585 | err_features: | |
586 | return r; | |
587 | } | |
588 | ||
04097f7c | 589 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 590 | { |
04097f7c AK |
591 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
592 | memory_listener); | |
d5970055 MT |
593 | int r; |
594 | if (!!enable == dev->log_enabled) { | |
595 | return 0; | |
596 | } | |
597 | if (!dev->started) { | |
598 | dev->log_enabled = enable; | |
599 | return 0; | |
600 | } | |
601 | if (!enable) { | |
602 | r = vhost_dev_set_log(dev, false); | |
603 | if (r < 0) { | |
604 | return r; | |
605 | } | |
606 | if (dev->log) { | |
7267c094 | 607 | g_free(dev->log); |
d5970055 MT |
608 | } |
609 | dev->log = NULL; | |
610 | dev->log_size = 0; | |
611 | } else { | |
612 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
613 | r = vhost_dev_set_log(dev, true); | |
614 | if (r < 0) { | |
615 | return r; | |
616 | } | |
617 | } | |
618 | dev->log_enabled = enable; | |
619 | return 0; | |
620 | } | |
621 | ||
04097f7c AK |
622 | static void vhost_log_global_start(MemoryListener *listener) |
623 | { | |
624 | int r; | |
625 | ||
626 | r = vhost_migration_log(listener, true); | |
627 | if (r < 0) { | |
628 | abort(); | |
629 | } | |
630 | } | |
631 | ||
632 | static void vhost_log_global_stop(MemoryListener *listener) | |
633 | { | |
634 | int r; | |
635 | ||
636 | r = vhost_migration_log(listener, false); | |
637 | if (r < 0) { | |
638 | abort(); | |
639 | } | |
640 | } | |
641 | ||
642 | static void vhost_log_start(MemoryListener *listener, | |
643 | MemoryRegionSection *section) | |
644 | { | |
645 | /* FIXME: implement */ | |
646 | } | |
647 | ||
648 | static void vhost_log_stop(MemoryListener *listener, | |
649 | MemoryRegionSection *section) | |
650 | { | |
651 | /* FIXME: implement */ | |
652 | } | |
653 | ||
f56a1247 | 654 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
655 | struct VirtIODevice *vdev, |
656 | struct vhost_virtqueue *vq, | |
657 | unsigned idx) | |
658 | { | |
a8170e5e | 659 | hwaddr s, l, a; |
d5970055 | 660 | int r; |
a9f98bb5 | 661 | int vhost_vq_index = idx - dev->vq_index; |
d5970055 | 662 | struct vhost_vring_file file = { |
a9f98bb5 | 663 | .index = vhost_vq_index |
d5970055 MT |
664 | }; |
665 | struct vhost_vring_state state = { | |
a9f98bb5 | 666 | .index = vhost_vq_index |
d5970055 MT |
667 | }; |
668 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
669 | ||
a9f98bb5 JW |
670 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
671 | ||
d5970055 MT |
672 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
673 | r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state); | |
674 | if (r) { | |
675 | return -errno; | |
676 | } | |
677 | ||
678 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
679 | r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state); | |
680 | if (r) { | |
681 | return -errno; | |
682 | } | |
683 | ||
684 | s = l = virtio_queue_get_desc_size(vdev, idx); | |
685 | a = virtio_queue_get_desc_addr(vdev, idx); | |
686 | vq->desc = cpu_physical_memory_map(a, &l, 0); | |
687 | if (!vq->desc || l != s) { | |
688 | r = -ENOMEM; | |
689 | goto fail_alloc_desc; | |
690 | } | |
691 | s = l = virtio_queue_get_avail_size(vdev, idx); | |
692 | a = virtio_queue_get_avail_addr(vdev, idx); | |
693 | vq->avail = cpu_physical_memory_map(a, &l, 0); | |
694 | if (!vq->avail || l != s) { | |
695 | r = -ENOMEM; | |
696 | goto fail_alloc_avail; | |
697 | } | |
698 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
699 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
700 | vq->used = cpu_physical_memory_map(a, &l, 1); | |
701 | if (!vq->used || l != s) { | |
702 | r = -ENOMEM; | |
703 | goto fail_alloc_used; | |
704 | } | |
705 | ||
706 | vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); | |
707 | vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); | |
708 | vq->ring = cpu_physical_memory_map(a, &l, 1); | |
709 | if (!vq->ring || l != s) { | |
710 | r = -ENOMEM; | |
711 | goto fail_alloc_ring; | |
712 | } | |
713 | ||
a9f98bb5 | 714 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
715 | if (r < 0) { |
716 | r = -errno; | |
717 | goto fail_alloc; | |
718 | } | |
a9f98bb5 | 719 | |
d5970055 MT |
720 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
721 | r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file); | |
722 | if (r) { | |
c8852121 | 723 | r = -errno; |
d5970055 MT |
724 | goto fail_kick; |
725 | } | |
726 | ||
f56a1247 MT |
727 | /* Clear and discard previous events if any. */ |
728 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 MT |
729 | |
730 | return 0; | |
731 | ||
d5970055 | 732 | fail_kick: |
d5970055 MT |
733 | fail_alloc: |
734 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
735 | 0, 0); | |
736 | fail_alloc_ring: | |
737 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
738 | 0, 0); | |
739 | fail_alloc_used: | |
740 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
741 | 0, 0); | |
742 | fail_alloc_avail: | |
743 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
744 | 0, 0); | |
745 | fail_alloc_desc: | |
746 | return r; | |
747 | } | |
748 | ||
f56a1247 | 749 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
750 | struct VirtIODevice *vdev, |
751 | struct vhost_virtqueue *vq, | |
752 | unsigned idx) | |
753 | { | |
754 | struct vhost_vring_state state = { | |
a9f98bb5 | 755 | .index = idx - dev->vq_index |
d5970055 MT |
756 | }; |
757 | int r; | |
a9f98bb5 | 758 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
d5970055 MT |
759 | r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state); |
760 | if (r < 0) { | |
761 | fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r); | |
762 | fflush(stderr); | |
763 | } | |
764 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
765 | assert (r >= 0); | |
766 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
767 | 0, virtio_queue_get_ring_size(vdev, idx)); | |
768 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
769 | 1, virtio_queue_get_used_size(vdev, idx)); | |
770 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
771 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
772 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
773 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
774 | } | |
775 | ||
80a1ea37 AK |
776 | static void vhost_eventfd_add(MemoryListener *listener, |
777 | MemoryRegionSection *section, | |
753d5e14 | 778 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
779 | { |
780 | } | |
781 | ||
782 | static void vhost_eventfd_del(MemoryListener *listener, | |
783 | MemoryRegionSection *section, | |
753d5e14 | 784 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
785 | { |
786 | } | |
787 | ||
f56a1247 MT |
788 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
789 | struct vhost_virtqueue *vq, int n) | |
790 | { | |
791 | struct vhost_vring_file file = { | |
792 | .index = n, | |
793 | }; | |
794 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
795 | if (r < 0) { | |
796 | return r; | |
797 | } | |
798 | ||
799 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
800 | r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file); | |
801 | if (r) { | |
802 | r = -errno; | |
803 | goto fail_call; | |
804 | } | |
805 | return 0; | |
806 | fail_call: | |
807 | event_notifier_cleanup(&vq->masked_notifier); | |
808 | return r; | |
809 | } | |
810 | ||
811 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
812 | { | |
813 | event_notifier_cleanup(&vq->masked_notifier); | |
814 | } | |
815 | ||
1241ed94 SH |
816 | int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath, |
817 | bool force) | |
d5970055 MT |
818 | { |
819 | uint64_t features; | |
f56a1247 | 820 | int i, r; |
d5970055 MT |
821 | if (devfd >= 0) { |
822 | hdev->control = devfd; | |
823 | } else { | |
1241ed94 | 824 | hdev->control = open(devpath, O_RDWR); |
d5970055 MT |
825 | if (hdev->control < 0) { |
826 | return -errno; | |
827 | } | |
828 | } | |
829 | r = ioctl(hdev->control, VHOST_SET_OWNER, NULL); | |
830 | if (r < 0) { | |
831 | goto fail; | |
832 | } | |
833 | ||
834 | r = ioctl(hdev->control, VHOST_GET_FEATURES, &features); | |
835 | if (r < 0) { | |
836 | goto fail; | |
837 | } | |
f56a1247 MT |
838 | |
839 | for (i = 0; i < hdev->nvqs; ++i) { | |
840 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, i); | |
841 | if (r < 0) { | |
842 | goto fail_vq; | |
843 | } | |
844 | } | |
d5970055 MT |
845 | hdev->features = features; |
846 | ||
04097f7c | 847 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
848 | .begin = vhost_begin, |
849 | .commit = vhost_commit, | |
04097f7c AK |
850 | .region_add = vhost_region_add, |
851 | .region_del = vhost_region_del, | |
50c1e149 | 852 | .region_nop = vhost_region_nop, |
04097f7c AK |
853 | .log_start = vhost_log_start, |
854 | .log_stop = vhost_log_stop, | |
855 | .log_sync = vhost_log_sync, | |
856 | .log_global_start = vhost_log_global_start, | |
857 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
858 | .eventfd_add = vhost_eventfd_add, |
859 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 860 | .priority = 10 |
04097f7c | 861 | }; |
7267c094 | 862 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
863 | hdev->n_mem_sections = 0; |
864 | hdev->mem_sections = NULL; | |
d5970055 MT |
865 | hdev->log = NULL; |
866 | hdev->log_size = 0; | |
867 | hdev->log_enabled = false; | |
868 | hdev->started = false; | |
af603142 | 869 | hdev->memory_changed = false; |
f6790af6 | 870 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
5430a28f | 871 | hdev->force = force; |
d5970055 | 872 | return 0; |
f56a1247 MT |
873 | fail_vq: |
874 | while (--i >= 0) { | |
875 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
876 | } | |
d5970055 MT |
877 | fail: |
878 | r = -errno; | |
879 | close(hdev->control); | |
880 | return r; | |
881 | } | |
882 | ||
883 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
884 | { | |
f56a1247 MT |
885 | int i; |
886 | for (i = 0; i < hdev->nvqs; ++i) { | |
887 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
888 | } | |
04097f7c | 889 | memory_listener_unregister(&hdev->memory_listener); |
7267c094 | 890 | g_free(hdev->mem); |
2817b260 | 891 | g_free(hdev->mem_sections); |
d5970055 MT |
892 | close(hdev->control); |
893 | } | |
894 | ||
5430a28f | 895 | bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev) |
896 | { | |
1c819449 KF |
897 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
898 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
899 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
900 | ||
901 | return !k->query_guest_notifiers || | |
902 | k->query_guest_notifiers(qbus->parent) || | |
903 | hdev->force; | |
5430a28f | 904 | } |
905 | ||
b0b3db79 MT |
906 | /* Stop processing guest IO notifications in qemu. |
907 | * Start processing them in vhost in kernel. | |
908 | */ | |
909 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
910 | { | |
1c819449 KF |
911 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
912 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
913 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 | 914 | int i, r; |
1c819449 | 915 | if (!k->set_host_notifier) { |
b0b3db79 MT |
916 | fprintf(stderr, "binding does not support host notifiers\n"); |
917 | r = -ENOSYS; | |
918 | goto fail; | |
919 | } | |
920 | ||
921 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 922 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, true); |
b0b3db79 MT |
923 | if (r < 0) { |
924 | fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r); | |
925 | goto fail_vq; | |
926 | } | |
927 | } | |
928 | ||
929 | return 0; | |
930 | fail_vq: | |
931 | while (--i >= 0) { | |
1c819449 | 932 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
933 | if (r < 0) { |
934 | fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r); | |
935 | fflush(stderr); | |
936 | } | |
937 | assert (r >= 0); | |
938 | } | |
939 | fail: | |
940 | return r; | |
941 | } | |
942 | ||
943 | /* Stop processing guest IO notifications in vhost. | |
944 | * Start processing them in qemu. | |
945 | * This might actually run the qemu handlers right away, | |
946 | * so virtio in qemu must be completely setup when this is called. | |
947 | */ | |
948 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
949 | { | |
1c819449 KF |
950 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
951 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
952 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 MT |
953 | int i, r; |
954 | ||
955 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 956 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
957 | if (r < 0) { |
958 | fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r); | |
959 | fflush(stderr); | |
960 | } | |
961 | assert (r >= 0); | |
962 | } | |
963 | } | |
964 | ||
f56a1247 MT |
965 | /* Test and clear event pending status. |
966 | * Should be called after unmask to avoid losing events. | |
967 | */ | |
968 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
969 | { | |
a9f98bb5 | 970 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
f56a1247 | 971 | assert(hdev->started); |
a9f98bb5 | 972 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
973 | return event_notifier_test_and_clear(&vq->masked_notifier); |
974 | } | |
975 | ||
976 | /* Mask/unmask events from this vq. */ | |
977 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
978 | bool mask) | |
979 | { | |
980 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 981 | int r, index = n - hdev->vq_index; |
f56a1247 MT |
982 | |
983 | assert(hdev->started); | |
a9f98bb5 | 984 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
985 | |
986 | struct vhost_vring_file file = { | |
a9f98bb5 | 987 | .index = index |
f56a1247 MT |
988 | }; |
989 | if (mask) { | |
a9f98bb5 | 990 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
991 | } else { |
992 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
993 | } | |
994 | r = ioctl(hdev->control, VHOST_SET_VRING_CALL, &file); | |
995 | assert(r >= 0); | |
996 | } | |
997 | ||
b0b3db79 | 998 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
999 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1000 | { | |
1001 | int i, r; | |
24f4fe34 MT |
1002 | |
1003 | hdev->started = true; | |
1004 | ||
d5970055 MT |
1005 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1006 | if (r < 0) { | |
54dd9321 | 1007 | goto fail_features; |
d5970055 MT |
1008 | } |
1009 | r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem); | |
1010 | if (r < 0) { | |
1011 | r = -errno; | |
54dd9321 | 1012 | goto fail_mem; |
d5970055 | 1013 | } |
d154e0ba | 1014 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1015 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1016 | vdev, |
1017 | hdev->vqs + i, | |
1018 | hdev->vq_index + i); | |
d154e0ba MT |
1019 | if (r < 0) { |
1020 | goto fail_vq; | |
1021 | } | |
1022 | } | |
1023 | ||
d5970055 MT |
1024 | if (hdev->log_enabled) { |
1025 | hdev->log_size = vhost_get_log_size(hdev); | |
1026 | hdev->log = hdev->log_size ? | |
7267c094 | 1027 | g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL; |
d5970055 MT |
1028 | r = ioctl(hdev->control, VHOST_SET_LOG_BASE, |
1029 | (uint64_t)(unsigned long)hdev->log); | |
1030 | if (r < 0) { | |
1031 | r = -errno; | |
54dd9321 | 1032 | goto fail_log; |
d5970055 MT |
1033 | } |
1034 | } | |
d154e0ba | 1035 | |
d5970055 | 1036 | return 0; |
54dd9321 | 1037 | fail_log: |
d5970055 MT |
1038 | fail_vq: |
1039 | while (--i >= 0) { | |
f56a1247 | 1040 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1041 | vdev, |
1042 | hdev->vqs + i, | |
1043 | hdev->vq_index + i); | |
d5970055 | 1044 | } |
a9f98bb5 | 1045 | i = hdev->nvqs; |
54dd9321 MT |
1046 | fail_mem: |
1047 | fail_features: | |
24f4fe34 MT |
1048 | |
1049 | hdev->started = false; | |
d5970055 MT |
1050 | return r; |
1051 | } | |
1052 | ||
b0b3db79 | 1053 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1054 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1055 | { | |
a9f98bb5 | 1056 | int i; |
54dd9321 | 1057 | |
d5970055 | 1058 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1059 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1060 | vdev, |
1061 | hdev->vqs + i, | |
1062 | hdev->vq_index + i); | |
d5970055 | 1063 | } |
6b37a23d | 1064 | vhost_log_sync_range(hdev, 0, ~0x0ull); |
54dd9321 | 1065 | |
d5970055 | 1066 | hdev->started = false; |
7267c094 | 1067 | g_free(hdev->log); |
c1be973a | 1068 | hdev->log = NULL; |
d5970055 MT |
1069 | hdev->log_size = 0; |
1070 | } | |
a9f98bb5 | 1071 |