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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" |
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" |
d5970055 MT |
23 | |
24 | static void vhost_dev_sync_region(struct vhost_dev *dev, | |
2817b260 | 25 | MemoryRegionSection *section, |
d5970055 MT |
26 | uint64_t mfirst, uint64_t mlast, |
27 | uint64_t rfirst, uint64_t rlast) | |
28 | { | |
29 | uint64_t start = MAX(mfirst, rfirst); | |
30 | uint64_t end = MIN(mlast, rlast); | |
31 | vhost_log_chunk_t *from = dev->log + start / VHOST_LOG_CHUNK; | |
32 | vhost_log_chunk_t *to = dev->log + end / VHOST_LOG_CHUNK + 1; | |
33 | uint64_t addr = (start / VHOST_LOG_CHUNK) * VHOST_LOG_CHUNK; | |
34 | ||
d5970055 MT |
35 | if (end < start) { |
36 | return; | |
37 | } | |
e314672a | 38 | assert(end / VHOST_LOG_CHUNK < dev->log_size); |
fbbaf9ae | 39 | assert(start / VHOST_LOG_CHUNK < dev->log_size); |
e314672a | 40 | |
d5970055 MT |
41 | for (;from < to; ++from) { |
42 | vhost_log_chunk_t log; | |
43 | int bit; | |
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 | } | |
50 | /* Data must be read atomically. We don't really | |
51 | * need the barrier semantics of __sync | |
52 | * builtins, but it's easier to use them than | |
53 | * roll our own. */ | |
54 | log = __sync_fetch_and_and(from, 0); | |
55 | while ((bit = sizeof(log) > sizeof(int) ? | |
56 | ffsll(log) : ffs(log))) { | |
6b37a23d MT |
57 | hwaddr page_addr; |
58 | hwaddr section_offset; | |
59 | hwaddr mr_offset; | |
d5970055 | 60 | bit -= 1; |
6b37a23d MT |
61 | page_addr = addr + bit * VHOST_LOG_PAGE; |
62 | section_offset = page_addr - section->offset_within_address_space; | |
63 | mr_offset = section_offset + section->offset_within_region; | |
64 | memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); | |
d5970055 MT |
65 | log &= ~(0x1ull << bit); |
66 | } | |
67 | addr += VHOST_LOG_CHUNK; | |
68 | } | |
69 | } | |
70 | ||
04097f7c | 71 | static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
2817b260 | 72 | MemoryRegionSection *section, |
6b37a23d MT |
73 | hwaddr first, |
74 | hwaddr last) | |
d5970055 | 75 | { |
d5970055 | 76 | int i; |
6b37a23d MT |
77 | hwaddr start_addr; |
78 | hwaddr end_addr; | |
04097f7c | 79 | |
d5970055 MT |
80 | if (!dev->log_enabled || !dev->started) { |
81 | return 0; | |
82 | } | |
6b37a23d | 83 | start_addr = section->offset_within_address_space; |
052e87b0 | 84 | end_addr = range_get_last(start_addr, int128_get64(section->size)); |
6b37a23d MT |
85 | start_addr = MAX(first, start_addr); |
86 | end_addr = MIN(last, end_addr); | |
87 | ||
d5970055 MT |
88 | for (i = 0; i < dev->mem->nregions; ++i) { |
89 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
2817b260 | 90 | vhost_dev_sync_region(dev, section, start_addr, end_addr, |
d5970055 MT |
91 | reg->guest_phys_addr, |
92 | range_get_last(reg->guest_phys_addr, | |
93 | reg->memory_size)); | |
94 | } | |
95 | for (i = 0; i < dev->nvqs; ++i) { | |
96 | struct vhost_virtqueue *vq = dev->vqs + i; | |
2817b260 | 97 | vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
d5970055 MT |
98 | range_get_last(vq->used_phys, vq->used_size)); |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
04097f7c AK |
103 | static void vhost_log_sync(MemoryListener *listener, |
104 | MemoryRegionSection *section) | |
105 | { | |
106 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
107 | memory_listener); | |
6b37a23d MT |
108 | vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
109 | } | |
04097f7c | 110 | |
6b37a23d MT |
111 | static void vhost_log_sync_range(struct vhost_dev *dev, |
112 | hwaddr first, hwaddr last) | |
113 | { | |
114 | int i; | |
115 | /* FIXME: this is N^2 in number of sections */ | |
116 | for (i = 0; i < dev->n_mem_sections; ++i) { | |
117 | MemoryRegionSection *section = &dev->mem_sections[i]; | |
118 | vhost_sync_dirty_bitmap(dev, section, first, last); | |
119 | } | |
04097f7c AK |
120 | } |
121 | ||
d5970055 MT |
122 | /* Assign/unassign. Keep an unsorted array of non-overlapping |
123 | * memory regions in dev->mem. */ | |
124 | static void vhost_dev_unassign_memory(struct vhost_dev *dev, | |
125 | uint64_t start_addr, | |
126 | uint64_t size) | |
127 | { | |
128 | int from, to, n = dev->mem->nregions; | |
129 | /* Track overlapping/split regions for sanity checking. */ | |
130 | int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0; | |
131 | ||
132 | for (from = 0, to = 0; from < n; ++from, ++to) { | |
133 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
134 | uint64_t reglast; | |
135 | uint64_t memlast; | |
136 | uint64_t change; | |
137 | ||
138 | /* clone old region */ | |
139 | if (to != from) { | |
140 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
141 | } | |
142 | ||
143 | /* No overlap is simple */ | |
144 | if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
145 | start_addr, size)) { | |
146 | continue; | |
147 | } | |
148 | ||
149 | /* Split only happens if supplied region | |
150 | * is in the middle of an existing one. Thus it can not | |
151 | * overlap with any other existing region. */ | |
152 | assert(!split); | |
153 | ||
154 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
155 | memlast = range_get_last(start_addr, size); | |
156 | ||
157 | /* Remove whole region */ | |
158 | if (start_addr <= reg->guest_phys_addr && memlast >= reglast) { | |
159 | --dev->mem->nregions; | |
160 | --to; | |
d5970055 MT |
161 | ++overlap_middle; |
162 | continue; | |
163 | } | |
164 | ||
165 | /* Shrink region */ | |
166 | if (memlast >= reglast) { | |
167 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
168 | assert(reg->memory_size); | |
169 | assert(!overlap_end); | |
170 | ++overlap_end; | |
171 | continue; | |
172 | } | |
173 | ||
174 | /* Shift region */ | |
175 | if (start_addr <= reg->guest_phys_addr) { | |
176 | change = memlast + 1 - reg->guest_phys_addr; | |
177 | reg->memory_size -= change; | |
178 | reg->guest_phys_addr += change; | |
179 | reg->userspace_addr += change; | |
180 | assert(reg->memory_size); | |
181 | assert(!overlap_start); | |
182 | ++overlap_start; | |
183 | continue; | |
184 | } | |
185 | ||
186 | /* This only happens if supplied region | |
187 | * is in the middle of an existing one. Thus it can not | |
188 | * overlap with any other existing region. */ | |
189 | assert(!overlap_start); | |
190 | assert(!overlap_end); | |
191 | assert(!overlap_middle); | |
192 | /* Split region: shrink first part, shift second part. */ | |
193 | memcpy(dev->mem->regions + n, reg, sizeof *reg); | |
194 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
195 | assert(reg->memory_size); | |
196 | change = memlast + 1 - reg->guest_phys_addr; | |
197 | reg = dev->mem->regions + n; | |
198 | reg->memory_size -= change; | |
199 | assert(reg->memory_size); | |
200 | reg->guest_phys_addr += change; | |
201 | reg->userspace_addr += change; | |
202 | /* Never add more than 1 region */ | |
203 | assert(dev->mem->nregions == n); | |
204 | ++dev->mem->nregions; | |
205 | ++split; | |
206 | } | |
207 | } | |
208 | ||
209 | /* Called after unassign, so no regions overlap the given range. */ | |
210 | static void vhost_dev_assign_memory(struct vhost_dev *dev, | |
211 | uint64_t start_addr, | |
212 | uint64_t size, | |
213 | uint64_t uaddr) | |
214 | { | |
215 | int from, to; | |
216 | struct vhost_memory_region *merged = NULL; | |
217 | for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) { | |
218 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
219 | uint64_t prlast, urlast; | |
220 | uint64_t pmlast, umlast; | |
221 | uint64_t s, e, u; | |
222 | ||
223 | /* clone old region */ | |
224 | if (to != from) { | |
225 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
226 | } | |
227 | prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
228 | pmlast = range_get_last(start_addr, size); | |
229 | urlast = range_get_last(reg->userspace_addr, reg->memory_size); | |
230 | umlast = range_get_last(uaddr, size); | |
231 | ||
232 | /* check for overlapping regions: should never happen. */ | |
233 | assert(prlast < start_addr || pmlast < reg->guest_phys_addr); | |
234 | /* Not an adjacent or overlapping region - do not merge. */ | |
235 | if ((prlast + 1 != start_addr || urlast + 1 != uaddr) && | |
236 | (pmlast + 1 != reg->guest_phys_addr || | |
237 | umlast + 1 != reg->userspace_addr)) { | |
238 | continue; | |
239 | } | |
240 | ||
241 | if (merged) { | |
242 | --to; | |
243 | assert(to >= 0); | |
244 | } else { | |
245 | merged = reg; | |
246 | } | |
247 | u = MIN(uaddr, reg->userspace_addr); | |
248 | s = MIN(start_addr, reg->guest_phys_addr); | |
249 | e = MAX(pmlast, prlast); | |
250 | uaddr = merged->userspace_addr = u; | |
251 | start_addr = merged->guest_phys_addr = s; | |
252 | size = merged->memory_size = e - s + 1; | |
253 | assert(merged->memory_size); | |
254 | } | |
255 | ||
256 | if (!merged) { | |
257 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
258 | memset(reg, 0, sizeof *reg); | |
259 | reg->memory_size = size; | |
260 | assert(reg->memory_size); | |
261 | reg->guest_phys_addr = start_addr; | |
262 | reg->userspace_addr = uaddr; | |
263 | ++to; | |
264 | } | |
265 | assert(to <= dev->mem->nregions + 1); | |
266 | dev->mem->nregions = to; | |
267 | } | |
268 | ||
269 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) | |
270 | { | |
271 | uint64_t log_size = 0; | |
272 | int i; | |
273 | for (i = 0; i < dev->mem->nregions; ++i) { | |
274 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
275 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
276 | reg->memory_size); | |
277 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
278 | } | |
279 | for (i = 0; i < dev->nvqs; ++i) { | |
280 | struct vhost_virtqueue *vq = dev->vqs + i; | |
281 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
282 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
283 | } | |
284 | return log_size; | |
285 | } | |
286 | ||
287 | static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size) | |
288 | { | |
289 | vhost_log_chunk_t *log; | |
290 | uint64_t log_base; | |
6b37a23d | 291 | int r; |
6528499f MA |
292 | |
293 | log = g_malloc0(size * sizeof *log); | |
d5970055 MT |
294 | log_base = (uint64_t)(unsigned long)log; |
295 | r = ioctl(dev->control, VHOST_SET_LOG_BASE, &log_base); | |
296 | assert(r >= 0); | |
6b37a23d MT |
297 | /* Sync only the range covered by the old log */ |
298 | if (dev->log_size) { | |
299 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
2817b260 | 300 | } |
d5970055 | 301 | if (dev->log) { |
7267c094 | 302 | g_free(dev->log); |
d5970055 MT |
303 | } |
304 | dev->log = log; | |
305 | dev->log_size = size; | |
306 | } | |
307 | ||
308 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, | |
309 | uint64_t start_addr, | |
310 | uint64_t size) | |
311 | { | |
312 | int i; | |
313 | for (i = 0; i < dev->nvqs; ++i) { | |
314 | struct vhost_virtqueue *vq = dev->vqs + i; | |
a8170e5e | 315 | hwaddr l; |
d5970055 MT |
316 | void *p; |
317 | ||
318 | if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) { | |
319 | continue; | |
320 | } | |
321 | l = vq->ring_size; | |
322 | p = cpu_physical_memory_map(vq->ring_phys, &l, 1); | |
323 | if (!p || l != vq->ring_size) { | |
324 | fprintf(stderr, "Unable to map ring buffer for ring %d\n", i); | |
325 | return -ENOMEM; | |
326 | } | |
327 | if (p != vq->ring) { | |
328 | fprintf(stderr, "Ring buffer relocated for ring %d\n", i); | |
329 | return -EBUSY; | |
330 | } | |
331 | cpu_physical_memory_unmap(p, l, 0, 0); | |
332 | } | |
333 | return 0; | |
334 | } | |
335 | ||
4e789564 MT |
336 | static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
337 | uint64_t start_addr, | |
338 | uint64_t size) | |
339 | { | |
340 | int i, n = dev->mem->nregions; | |
341 | for (i = 0; i < n; ++i) { | |
342 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
343 | if (ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
344 | start_addr, size)) { | |
345 | return reg; | |
346 | } | |
347 | } | |
348 | return NULL; | |
349 | } | |
350 | ||
351 | static bool vhost_dev_cmp_memory(struct vhost_dev *dev, | |
352 | uint64_t start_addr, | |
353 | uint64_t size, | |
354 | uint64_t uaddr) | |
355 | { | |
356 | struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size); | |
357 | uint64_t reglast; | |
358 | uint64_t memlast; | |
359 | ||
360 | if (!reg) { | |
361 | return true; | |
362 | } | |
363 | ||
364 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
365 | memlast = range_get_last(start_addr, size); | |
366 | ||
367 | /* Need to extend region? */ | |
368 | if (start_addr < reg->guest_phys_addr || memlast > reglast) { | |
369 | return true; | |
370 | } | |
371 | /* userspace_addr changed? */ | |
372 | return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr; | |
373 | } | |
374 | ||
04097f7c AK |
375 | static void vhost_set_memory(MemoryListener *listener, |
376 | MemoryRegionSection *section, | |
377 | bool add) | |
d5970055 | 378 | { |
04097f7c AK |
379 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
380 | memory_listener); | |
a8170e5e | 381 | hwaddr start_addr = section->offset_within_address_space; |
052e87b0 | 382 | ram_addr_t size = int128_get64(section->size); |
04097f7c | 383 | bool log_dirty = memory_region_is_logging(section->mr); |
d5970055 MT |
384 | int s = offsetof(struct vhost_memory, regions) + |
385 | (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; | |
04097f7c AK |
386 | void *ram; |
387 | ||
7267c094 | 388 | dev->mem = g_realloc(dev->mem, s); |
d5970055 | 389 | |
f5a4e64f | 390 | if (log_dirty) { |
04097f7c | 391 | add = false; |
f5a4e64f MT |
392 | } |
393 | ||
d5970055 MT |
394 | assert(size); |
395 | ||
4e789564 | 396 | /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */ |
d743c382 | 397 | ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
04097f7c AK |
398 | if (add) { |
399 | if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) { | |
4e789564 MT |
400 | /* Region exists with same address. Nothing to do. */ |
401 | return; | |
402 | } | |
403 | } else { | |
404 | if (!vhost_dev_find_reg(dev, start_addr, size)) { | |
405 | /* Removing region that we don't access. Nothing to do. */ | |
406 | return; | |
407 | } | |
408 | } | |
409 | ||
d5970055 | 410 | vhost_dev_unassign_memory(dev, start_addr, size); |
04097f7c | 411 | if (add) { |
d5970055 | 412 | /* Add given mapping, merging adjacent regions if any */ |
04097f7c | 413 | vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
d5970055 MT |
414 | } else { |
415 | /* Remove old mapping for this memory, if any. */ | |
416 | vhost_dev_unassign_memory(dev, start_addr, size); | |
417 | } | |
af603142 NB |
418 | dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); |
419 | dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); | |
420 | dev->memory_changed = true; | |
421 | } | |
422 | ||
423 | static bool vhost_section(MemoryRegionSection *section) | |
424 | { | |
425 | return memory_region_is_ram(section->mr); | |
426 | } | |
427 | ||
428 | static void vhost_begin(MemoryListener *listener) | |
429 | { | |
430 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
431 | memory_listener); | |
432 | dev->mem_changed_end_addr = 0; | |
433 | dev->mem_changed_start_addr = -1; | |
434 | } | |
d5970055 | 435 | |
af603142 NB |
436 | static void vhost_commit(MemoryListener *listener) |
437 | { | |
438 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
439 | memory_listener); | |
440 | hwaddr start_addr = 0; | |
441 | ram_addr_t size = 0; | |
442 | uint64_t log_size; | |
443 | int r; | |
444 | ||
445 | if (!dev->memory_changed) { | |
446 | return; | |
447 | } | |
d5970055 MT |
448 | if (!dev->started) { |
449 | return; | |
450 | } | |
af603142 NB |
451 | if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { |
452 | return; | |
453 | } | |
d5970055 MT |
454 | |
455 | if (dev->started) { | |
af603142 NB |
456 | start_addr = dev->mem_changed_start_addr; |
457 | size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; | |
458 | ||
d5970055 MT |
459 | r = vhost_verify_ring_mappings(dev, start_addr, size); |
460 | assert(r >= 0); | |
461 | } | |
462 | ||
463 | if (!dev->log_enabled) { | |
464 | r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); | |
465 | assert(r >= 0); | |
af603142 | 466 | dev->memory_changed = false; |
d5970055 MT |
467 | return; |
468 | } | |
469 | log_size = vhost_get_log_size(dev); | |
470 | /* We allocate an extra 4K bytes to log, | |
471 | * to reduce the * number of reallocations. */ | |
472 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
473 | /* To log more, must increase log size before table update. */ | |
474 | if (dev->log_size < log_size) { | |
475 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
476 | } | |
477 | r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); | |
478 | assert(r >= 0); | |
479 | /* To log less, can only decrease log size after table update. */ | |
480 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
481 | vhost_dev_log_resize(dev, log_size); | |
482 | } | |
af603142 | 483 | dev->memory_changed = false; |
50c1e149 AK |
484 | } |
485 | ||
04097f7c AK |
486 | static void vhost_region_add(MemoryListener *listener, |
487 | MemoryRegionSection *section) | |
488 | { | |
2817b260 AK |
489 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
490 | memory_listener); | |
491 | ||
c49450b9 AK |
492 | if (!vhost_section(section)) { |
493 | return; | |
494 | } | |
495 | ||
2817b260 AK |
496 | ++dev->n_mem_sections; |
497 | dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, | |
498 | dev->n_mem_sections); | |
499 | dev->mem_sections[dev->n_mem_sections - 1] = *section; | |
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); |
2817b260 AK |
515 | for (i = 0; i < dev->n_mem_sections; ++i) { |
516 | if (dev->mem_sections[i].offset_within_address_space | |
517 | == section->offset_within_address_space) { | |
518 | --dev->n_mem_sections; | |
519 | memmove(&dev->mem_sections[i], &dev->mem_sections[i+1], | |
637f7a6a | 520 | (dev->n_mem_sections - i) * sizeof(*dev->mem_sections)); |
2817b260 AK |
521 | break; |
522 | } | |
523 | } | |
04097f7c AK |
524 | } |
525 | ||
50c1e149 AK |
526 | static void vhost_region_nop(MemoryListener *listener, |
527 | MemoryRegionSection *section) | |
528 | { | |
529 | } | |
530 | ||
d5970055 MT |
531 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
532 | struct vhost_virtqueue *vq, | |
533 | unsigned idx, bool enable_log) | |
534 | { | |
535 | struct vhost_vring_addr addr = { | |
536 | .index = idx, | |
2b3af999 SW |
537 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
538 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
539 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
540 | .log_guest_addr = vq->used_phys, |
541 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
542 | }; | |
543 | int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr); | |
544 | if (r < 0) { | |
545 | return -errno; | |
546 | } | |
547 | return 0; | |
548 | } | |
549 | ||
550 | static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) | |
551 | { | |
552 | uint64_t features = dev->acked_features; | |
553 | int r; | |
554 | if (enable_log) { | |
555 | features |= 0x1 << VHOST_F_LOG_ALL; | |
556 | } | |
557 | r = ioctl(dev->control, VHOST_SET_FEATURES, &features); | |
558 | return r < 0 ? -errno : 0; | |
559 | } | |
560 | ||
561 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
562 | { | |
563 | int r, t, i; | |
564 | r = vhost_dev_set_features(dev, enable_log); | |
565 | if (r < 0) { | |
566 | goto err_features; | |
567 | } | |
568 | for (i = 0; i < dev->nvqs; ++i) { | |
569 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
570 | enable_log); | |
571 | if (r < 0) { | |
572 | goto err_vq; | |
573 | } | |
574 | } | |
575 | return 0; | |
576 | err_vq: | |
577 | for (; i >= 0; --i) { | |
578 | t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
579 | dev->log_enabled); | |
580 | assert(t >= 0); | |
581 | } | |
582 | t = vhost_dev_set_features(dev, dev->log_enabled); | |
583 | assert(t >= 0); | |
584 | err_features: | |
585 | return r; | |
586 | } | |
587 | ||
04097f7c | 588 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 589 | { |
04097f7c AK |
590 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
591 | memory_listener); | |
d5970055 MT |
592 | int r; |
593 | if (!!enable == dev->log_enabled) { | |
594 | return 0; | |
595 | } | |
596 | if (!dev->started) { | |
597 | dev->log_enabled = enable; | |
598 | return 0; | |
599 | } | |
600 | if (!enable) { | |
601 | r = vhost_dev_set_log(dev, false); | |
602 | if (r < 0) { | |
603 | return r; | |
604 | } | |
605 | if (dev->log) { | |
7267c094 | 606 | g_free(dev->log); |
d5970055 MT |
607 | } |
608 | dev->log = NULL; | |
609 | dev->log_size = 0; | |
610 | } else { | |
611 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
612 | r = vhost_dev_set_log(dev, true); | |
613 | if (r < 0) { | |
614 | return r; | |
615 | } | |
616 | } | |
617 | dev->log_enabled = enable; | |
618 | return 0; | |
619 | } | |
620 | ||
04097f7c AK |
621 | static void vhost_log_global_start(MemoryListener *listener) |
622 | { | |
623 | int r; | |
624 | ||
625 | r = vhost_migration_log(listener, true); | |
626 | if (r < 0) { | |
627 | abort(); | |
628 | } | |
629 | } | |
630 | ||
631 | static void vhost_log_global_stop(MemoryListener *listener) | |
632 | { | |
633 | int r; | |
634 | ||
635 | r = vhost_migration_log(listener, false); | |
636 | if (r < 0) { | |
637 | abort(); | |
638 | } | |
639 | } | |
640 | ||
641 | static void vhost_log_start(MemoryListener *listener, | |
642 | MemoryRegionSection *section) | |
643 | { | |
644 | /* FIXME: implement */ | |
645 | } | |
646 | ||
647 | static void vhost_log_stop(MemoryListener *listener, | |
648 | MemoryRegionSection *section) | |
649 | { | |
650 | /* FIXME: implement */ | |
651 | } | |
652 | ||
f56a1247 | 653 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
654 | struct VirtIODevice *vdev, |
655 | struct vhost_virtqueue *vq, | |
656 | unsigned idx) | |
657 | { | |
a8170e5e | 658 | hwaddr s, l, a; |
d5970055 | 659 | int r; |
a9f98bb5 | 660 | int vhost_vq_index = idx - dev->vq_index; |
d5970055 | 661 | struct vhost_vring_file file = { |
a9f98bb5 | 662 | .index = vhost_vq_index |
d5970055 MT |
663 | }; |
664 | struct vhost_vring_state state = { | |
a9f98bb5 | 665 | .index = vhost_vq_index |
d5970055 MT |
666 | }; |
667 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
668 | ||
a9f98bb5 JW |
669 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
670 | ||
d5970055 MT |
671 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
672 | r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state); | |
673 | if (r) { | |
674 | return -errno; | |
675 | } | |
676 | ||
677 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
678 | r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state); | |
679 | if (r) { | |
680 | return -errno; | |
681 | } | |
682 | ||
683 | s = l = virtio_queue_get_desc_size(vdev, idx); | |
684 | a = virtio_queue_get_desc_addr(vdev, idx); | |
685 | vq->desc = cpu_physical_memory_map(a, &l, 0); | |
686 | if (!vq->desc || l != s) { | |
687 | r = -ENOMEM; | |
688 | goto fail_alloc_desc; | |
689 | } | |
690 | s = l = virtio_queue_get_avail_size(vdev, idx); | |
691 | a = virtio_queue_get_avail_addr(vdev, idx); | |
692 | vq->avail = cpu_physical_memory_map(a, &l, 0); | |
693 | if (!vq->avail || l != s) { | |
694 | r = -ENOMEM; | |
695 | goto fail_alloc_avail; | |
696 | } | |
697 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
698 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
699 | vq->used = cpu_physical_memory_map(a, &l, 1); | |
700 | if (!vq->used || l != s) { | |
701 | r = -ENOMEM; | |
702 | goto fail_alloc_used; | |
703 | } | |
704 | ||
705 | vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); | |
706 | vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); | |
707 | vq->ring = cpu_physical_memory_map(a, &l, 1); | |
708 | if (!vq->ring || l != s) { | |
709 | r = -ENOMEM; | |
710 | goto fail_alloc_ring; | |
711 | } | |
712 | ||
a9f98bb5 | 713 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
714 | if (r < 0) { |
715 | r = -errno; | |
716 | goto fail_alloc; | |
717 | } | |
a9f98bb5 | 718 | |
d5970055 MT |
719 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
720 | r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file); | |
721 | if (r) { | |
c8852121 | 722 | r = -errno; |
d5970055 MT |
723 | goto fail_kick; |
724 | } | |
725 | ||
f56a1247 MT |
726 | /* Clear and discard previous events if any. */ |
727 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 MT |
728 | |
729 | return 0; | |
730 | ||
d5970055 | 731 | fail_kick: |
d5970055 MT |
732 | fail_alloc: |
733 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
734 | 0, 0); | |
735 | fail_alloc_ring: | |
736 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
737 | 0, 0); | |
738 | fail_alloc_used: | |
739 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
740 | 0, 0); | |
741 | fail_alloc_avail: | |
742 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
743 | 0, 0); | |
744 | fail_alloc_desc: | |
745 | return r; | |
746 | } | |
747 | ||
f56a1247 | 748 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
749 | struct VirtIODevice *vdev, |
750 | struct vhost_virtqueue *vq, | |
751 | unsigned idx) | |
752 | { | |
753 | struct vhost_vring_state state = { | |
a9f98bb5 | 754 | .index = idx - dev->vq_index |
d5970055 MT |
755 | }; |
756 | int r; | |
a9f98bb5 | 757 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
d5970055 MT |
758 | r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state); |
759 | if (r < 0) { | |
760 | fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r); | |
761 | fflush(stderr); | |
762 | } | |
763 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
764 | assert (r >= 0); | |
765 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
766 | 0, virtio_queue_get_ring_size(vdev, idx)); | |
767 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
768 | 1, virtio_queue_get_used_size(vdev, idx)); | |
769 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
770 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
771 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
772 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
773 | } | |
774 | ||
80a1ea37 AK |
775 | static void vhost_eventfd_add(MemoryListener *listener, |
776 | MemoryRegionSection *section, | |
753d5e14 | 777 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
778 | { |
779 | } | |
780 | ||
781 | static void vhost_eventfd_del(MemoryListener *listener, | |
782 | MemoryRegionSection *section, | |
753d5e14 | 783 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
784 | { |
785 | } | |
786 | ||
f56a1247 MT |
787 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
788 | struct vhost_virtqueue *vq, int n) | |
789 | { | |
790 | struct vhost_vring_file file = { | |
791 | .index = n, | |
792 | }; | |
793 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
794 | if (r < 0) { | |
795 | return r; | |
796 | } | |
797 | ||
798 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
799 | r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file); | |
800 | if (r) { | |
801 | r = -errno; | |
802 | goto fail_call; | |
803 | } | |
804 | return 0; | |
805 | fail_call: | |
806 | event_notifier_cleanup(&vq->masked_notifier); | |
807 | return r; | |
808 | } | |
809 | ||
810 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
811 | { | |
812 | event_notifier_cleanup(&vq->masked_notifier); | |
813 | } | |
814 | ||
1241ed94 SH |
815 | int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath, |
816 | bool force) | |
d5970055 MT |
817 | { |
818 | uint64_t features; | |
f56a1247 | 819 | int i, r; |
d5970055 MT |
820 | if (devfd >= 0) { |
821 | hdev->control = devfd; | |
822 | } else { | |
1241ed94 | 823 | hdev->control = open(devpath, O_RDWR); |
d5970055 MT |
824 | if (hdev->control < 0) { |
825 | return -errno; | |
826 | } | |
827 | } | |
828 | r = ioctl(hdev->control, VHOST_SET_OWNER, NULL); | |
829 | if (r < 0) { | |
830 | goto fail; | |
831 | } | |
832 | ||
833 | r = ioctl(hdev->control, VHOST_GET_FEATURES, &features); | |
834 | if (r < 0) { | |
835 | goto fail; | |
836 | } | |
f56a1247 MT |
837 | |
838 | for (i = 0; i < hdev->nvqs; ++i) { | |
839 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, i); | |
840 | if (r < 0) { | |
841 | goto fail_vq; | |
842 | } | |
843 | } | |
d5970055 MT |
844 | hdev->features = features; |
845 | ||
04097f7c | 846 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
847 | .begin = vhost_begin, |
848 | .commit = vhost_commit, | |
04097f7c AK |
849 | .region_add = vhost_region_add, |
850 | .region_del = vhost_region_del, | |
50c1e149 | 851 | .region_nop = vhost_region_nop, |
04097f7c AK |
852 | .log_start = vhost_log_start, |
853 | .log_stop = vhost_log_stop, | |
854 | .log_sync = vhost_log_sync, | |
855 | .log_global_start = vhost_log_global_start, | |
856 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
857 | .eventfd_add = vhost_eventfd_add, |
858 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 859 | .priority = 10 |
04097f7c | 860 | }; |
7267c094 | 861 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
862 | hdev->n_mem_sections = 0; |
863 | hdev->mem_sections = NULL; | |
d5970055 MT |
864 | hdev->log = NULL; |
865 | hdev->log_size = 0; | |
866 | hdev->log_enabled = false; | |
867 | hdev->started = false; | |
af603142 | 868 | hdev->memory_changed = false; |
f6790af6 | 869 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
5430a28f | 870 | hdev->force = force; |
d5970055 | 871 | return 0; |
f56a1247 MT |
872 | fail_vq: |
873 | while (--i >= 0) { | |
874 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
875 | } | |
d5970055 MT |
876 | fail: |
877 | r = -errno; | |
878 | close(hdev->control); | |
879 | return r; | |
880 | } | |
881 | ||
882 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
883 | { | |
f56a1247 MT |
884 | int i; |
885 | for (i = 0; i < hdev->nvqs; ++i) { | |
886 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
887 | } | |
04097f7c | 888 | memory_listener_unregister(&hdev->memory_listener); |
7267c094 | 889 | g_free(hdev->mem); |
2817b260 | 890 | g_free(hdev->mem_sections); |
d5970055 MT |
891 | close(hdev->control); |
892 | } | |
893 | ||
5430a28f MT |
894 | bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev) |
895 | { | |
1c819449 FK |
896 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
897 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
898 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
899 | ||
900 | return !k->query_guest_notifiers || | |
901 | k->query_guest_notifiers(qbus->parent) || | |
902 | hdev->force; | |
5430a28f MT |
903 | } |
904 | ||
b0b3db79 MT |
905 | /* Stop processing guest IO notifications in qemu. |
906 | * Start processing them in vhost in kernel. | |
907 | */ | |
908 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
909 | { | |
1c819449 FK |
910 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
911 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
912 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 | 913 | int i, r; |
1c819449 | 914 | if (!k->set_host_notifier) { |
b0b3db79 MT |
915 | fprintf(stderr, "binding does not support host notifiers\n"); |
916 | r = -ENOSYS; | |
917 | goto fail; | |
918 | } | |
919 | ||
920 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 921 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, true); |
b0b3db79 MT |
922 | if (r < 0) { |
923 | fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r); | |
924 | goto fail_vq; | |
925 | } | |
926 | } | |
927 | ||
928 | return 0; | |
929 | fail_vq: | |
930 | while (--i >= 0) { | |
1c819449 | 931 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
932 | if (r < 0) { |
933 | fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r); | |
934 | fflush(stderr); | |
935 | } | |
936 | assert (r >= 0); | |
937 | } | |
938 | fail: | |
939 | return r; | |
940 | } | |
941 | ||
942 | /* Stop processing guest IO notifications in vhost. | |
943 | * Start processing them in qemu. | |
944 | * This might actually run the qemu handlers right away, | |
945 | * so virtio in qemu must be completely setup when this is called. | |
946 | */ | |
947 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
948 | { | |
1c819449 FK |
949 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
950 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
951 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 MT |
952 | int i, r; |
953 | ||
954 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 955 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
956 | if (r < 0) { |
957 | fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r); | |
958 | fflush(stderr); | |
959 | } | |
960 | assert (r >= 0); | |
961 | } | |
962 | } | |
963 | ||
f56a1247 MT |
964 | /* Test and clear event pending status. |
965 | * Should be called after unmask to avoid losing events. | |
966 | */ | |
967 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
968 | { | |
a9f98bb5 | 969 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
f56a1247 | 970 | assert(hdev->started); |
a9f98bb5 | 971 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
972 | return event_notifier_test_and_clear(&vq->masked_notifier); |
973 | } | |
974 | ||
975 | /* Mask/unmask events from this vq. */ | |
976 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
977 | bool mask) | |
978 | { | |
979 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 980 | int r, index = n - hdev->vq_index; |
f56a1247 MT |
981 | |
982 | assert(hdev->started); | |
a9f98bb5 | 983 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
984 | |
985 | struct vhost_vring_file file = { | |
a9f98bb5 | 986 | .index = index |
f56a1247 MT |
987 | }; |
988 | if (mask) { | |
a9f98bb5 | 989 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
990 | } else { |
991 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
992 | } | |
993 | r = ioctl(hdev->control, VHOST_SET_VRING_CALL, &file); | |
994 | assert(r >= 0); | |
995 | } | |
996 | ||
b0b3db79 | 997 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
998 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
999 | { | |
1000 | int i, r; | |
24f4fe34 MT |
1001 | |
1002 | hdev->started = true; | |
1003 | ||
d5970055 MT |
1004 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1005 | if (r < 0) { | |
54dd9321 | 1006 | goto fail_features; |
d5970055 MT |
1007 | } |
1008 | r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem); | |
1009 | if (r < 0) { | |
1010 | r = -errno; | |
54dd9321 | 1011 | goto fail_mem; |
d5970055 | 1012 | } |
d154e0ba | 1013 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1014 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1015 | vdev, |
1016 | hdev->vqs + i, | |
1017 | hdev->vq_index + i); | |
d154e0ba MT |
1018 | if (r < 0) { |
1019 | goto fail_vq; | |
1020 | } | |
1021 | } | |
1022 | ||
d5970055 MT |
1023 | if (hdev->log_enabled) { |
1024 | hdev->log_size = vhost_get_log_size(hdev); | |
1025 | hdev->log = hdev->log_size ? | |
7267c094 | 1026 | g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL; |
d5970055 MT |
1027 | r = ioctl(hdev->control, VHOST_SET_LOG_BASE, |
1028 | (uint64_t)(unsigned long)hdev->log); | |
1029 | if (r < 0) { | |
1030 | r = -errno; | |
54dd9321 | 1031 | goto fail_log; |
d5970055 MT |
1032 | } |
1033 | } | |
d154e0ba | 1034 | |
d5970055 | 1035 | return 0; |
54dd9321 | 1036 | fail_log: |
d5970055 MT |
1037 | fail_vq: |
1038 | while (--i >= 0) { | |
f56a1247 | 1039 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1040 | vdev, |
1041 | hdev->vqs + i, | |
1042 | hdev->vq_index + i); | |
d5970055 | 1043 | } |
a9f98bb5 | 1044 | i = hdev->nvqs; |
54dd9321 MT |
1045 | fail_mem: |
1046 | fail_features: | |
24f4fe34 MT |
1047 | |
1048 | hdev->started = false; | |
d5970055 MT |
1049 | return r; |
1050 | } | |
1051 | ||
b0b3db79 | 1052 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1053 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1054 | { | |
a9f98bb5 | 1055 | int i; |
54dd9321 | 1056 | |
d5970055 | 1057 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1058 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1059 | vdev, |
1060 | hdev->vqs + i, | |
1061 | hdev->vq_index + i); | |
d5970055 | 1062 | } |
6b37a23d | 1063 | vhost_log_sync_range(hdev, 0, ~0x0ull); |
54dd9321 | 1064 | |
d5970055 | 1065 | hdev->started = false; |
7267c094 | 1066 | g_free(hdev->log); |
c1be973a | 1067 | hdev->log = NULL; |
d5970055 MT |
1068 | hdev->log_size = 0; |
1069 | } | |
a9f98bb5 | 1070 |