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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" |
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; | |
d5970055 MT |
43 | /* We first check with non-atomic: much cheaper, |
44 | * and we expect non-dirty to be the common case. */ | |
45 | if (!*from) { | |
0c600ce2 | 46 | addr += VHOST_LOG_CHUNK; |
d5970055 MT |
47 | continue; |
48 | } | |
5444e768 PB |
49 | /* Data must be read atomically. We don't really need barrier semantics |
50 | * but it's easier to use atomic_* than roll our own. */ | |
51 | log = atomic_xchg(from, 0); | |
747eb78b NC |
52 | while (log) { |
53 | int bit = ctzl(log); | |
6b37a23d MT |
54 | hwaddr page_addr; |
55 | hwaddr section_offset; | |
56 | hwaddr mr_offset; | |
6b37a23d MT |
57 | page_addr = addr + bit * VHOST_LOG_PAGE; |
58 | section_offset = page_addr - section->offset_within_address_space; | |
59 | mr_offset = section_offset + section->offset_within_region; | |
60 | memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); | |
d5970055 MT |
61 | log &= ~(0x1ull << bit); |
62 | } | |
63 | addr += VHOST_LOG_CHUNK; | |
64 | } | |
65 | } | |
66 | ||
04097f7c | 67 | static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
2817b260 | 68 | MemoryRegionSection *section, |
6b37a23d MT |
69 | hwaddr first, |
70 | hwaddr last) | |
d5970055 | 71 | { |
d5970055 | 72 | int i; |
6b37a23d MT |
73 | hwaddr start_addr; |
74 | hwaddr end_addr; | |
04097f7c | 75 | |
d5970055 MT |
76 | if (!dev->log_enabled || !dev->started) { |
77 | return 0; | |
78 | } | |
6b37a23d | 79 | start_addr = section->offset_within_address_space; |
052e87b0 | 80 | end_addr = range_get_last(start_addr, int128_get64(section->size)); |
6b37a23d MT |
81 | start_addr = MAX(first, start_addr); |
82 | end_addr = MIN(last, end_addr); | |
83 | ||
d5970055 MT |
84 | for (i = 0; i < dev->mem->nregions; ++i) { |
85 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
2817b260 | 86 | vhost_dev_sync_region(dev, section, start_addr, end_addr, |
d5970055 MT |
87 | reg->guest_phys_addr, |
88 | range_get_last(reg->guest_phys_addr, | |
89 | reg->memory_size)); | |
90 | } | |
91 | for (i = 0; i < dev->nvqs; ++i) { | |
92 | struct vhost_virtqueue *vq = dev->vqs + i; | |
2817b260 | 93 | vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
d5970055 MT |
94 | range_get_last(vq->used_phys, vq->used_size)); |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
04097f7c AK |
99 | static void vhost_log_sync(MemoryListener *listener, |
100 | MemoryRegionSection *section) | |
101 | { | |
102 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
103 | memory_listener); | |
6b37a23d MT |
104 | vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
105 | } | |
04097f7c | 106 | |
6b37a23d MT |
107 | static void vhost_log_sync_range(struct vhost_dev *dev, |
108 | hwaddr first, hwaddr last) | |
109 | { | |
110 | int i; | |
111 | /* FIXME: this is N^2 in number of sections */ | |
112 | for (i = 0; i < dev->n_mem_sections; ++i) { | |
113 | MemoryRegionSection *section = &dev->mem_sections[i]; | |
114 | vhost_sync_dirty_bitmap(dev, section, first, last); | |
115 | } | |
04097f7c AK |
116 | } |
117 | ||
d5970055 MT |
118 | /* Assign/unassign. Keep an unsorted array of non-overlapping |
119 | * memory regions in dev->mem. */ | |
120 | static void vhost_dev_unassign_memory(struct vhost_dev *dev, | |
121 | uint64_t start_addr, | |
122 | uint64_t size) | |
123 | { | |
124 | int from, to, n = dev->mem->nregions; | |
125 | /* Track overlapping/split regions for sanity checking. */ | |
126 | int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0; | |
127 | ||
128 | for (from = 0, to = 0; from < n; ++from, ++to) { | |
129 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
130 | uint64_t reglast; | |
131 | uint64_t memlast; | |
132 | uint64_t change; | |
133 | ||
134 | /* clone old region */ | |
135 | if (to != from) { | |
136 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
137 | } | |
138 | ||
139 | /* No overlap is simple */ | |
140 | if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
141 | start_addr, size)) { | |
142 | continue; | |
143 | } | |
144 | ||
145 | /* Split only happens if supplied region | |
146 | * is in the middle of an existing one. Thus it can not | |
147 | * overlap with any other existing region. */ | |
148 | assert(!split); | |
149 | ||
150 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
151 | memlast = range_get_last(start_addr, size); | |
152 | ||
153 | /* Remove whole region */ | |
154 | if (start_addr <= reg->guest_phys_addr && memlast >= reglast) { | |
155 | --dev->mem->nregions; | |
156 | --to; | |
d5970055 MT |
157 | ++overlap_middle; |
158 | continue; | |
159 | } | |
160 | ||
161 | /* Shrink region */ | |
162 | if (memlast >= reglast) { | |
163 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
164 | assert(reg->memory_size); | |
165 | assert(!overlap_end); | |
166 | ++overlap_end; | |
167 | continue; | |
168 | } | |
169 | ||
170 | /* Shift region */ | |
171 | if (start_addr <= reg->guest_phys_addr) { | |
172 | change = memlast + 1 - reg->guest_phys_addr; | |
173 | reg->memory_size -= change; | |
174 | reg->guest_phys_addr += change; | |
175 | reg->userspace_addr += change; | |
176 | assert(reg->memory_size); | |
177 | assert(!overlap_start); | |
178 | ++overlap_start; | |
179 | continue; | |
180 | } | |
181 | ||
182 | /* This only happens if supplied region | |
183 | * is in the middle of an existing one. Thus it can not | |
184 | * overlap with any other existing region. */ | |
185 | assert(!overlap_start); | |
186 | assert(!overlap_end); | |
187 | assert(!overlap_middle); | |
188 | /* Split region: shrink first part, shift second part. */ | |
189 | memcpy(dev->mem->regions + n, reg, sizeof *reg); | |
190 | reg->memory_size = start_addr - reg->guest_phys_addr; | |
191 | assert(reg->memory_size); | |
192 | change = memlast + 1 - reg->guest_phys_addr; | |
193 | reg = dev->mem->regions + n; | |
194 | reg->memory_size -= change; | |
195 | assert(reg->memory_size); | |
196 | reg->guest_phys_addr += change; | |
197 | reg->userspace_addr += change; | |
198 | /* Never add more than 1 region */ | |
199 | assert(dev->mem->nregions == n); | |
200 | ++dev->mem->nregions; | |
201 | ++split; | |
202 | } | |
203 | } | |
204 | ||
205 | /* Called after unassign, so no regions overlap the given range. */ | |
206 | static void vhost_dev_assign_memory(struct vhost_dev *dev, | |
207 | uint64_t start_addr, | |
208 | uint64_t size, | |
209 | uint64_t uaddr) | |
210 | { | |
211 | int from, to; | |
212 | struct vhost_memory_region *merged = NULL; | |
213 | for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) { | |
214 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
215 | uint64_t prlast, urlast; | |
216 | uint64_t pmlast, umlast; | |
217 | uint64_t s, e, u; | |
218 | ||
219 | /* clone old region */ | |
220 | if (to != from) { | |
221 | memcpy(reg, dev->mem->regions + from, sizeof *reg); | |
222 | } | |
223 | prlast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
224 | pmlast = range_get_last(start_addr, size); | |
225 | urlast = range_get_last(reg->userspace_addr, reg->memory_size); | |
226 | umlast = range_get_last(uaddr, size); | |
227 | ||
228 | /* check for overlapping regions: should never happen. */ | |
229 | assert(prlast < start_addr || pmlast < reg->guest_phys_addr); | |
230 | /* Not an adjacent or overlapping region - do not merge. */ | |
231 | if ((prlast + 1 != start_addr || urlast + 1 != uaddr) && | |
232 | (pmlast + 1 != reg->guest_phys_addr || | |
233 | umlast + 1 != reg->userspace_addr)) { | |
234 | continue; | |
235 | } | |
236 | ||
237 | if (merged) { | |
238 | --to; | |
239 | assert(to >= 0); | |
240 | } else { | |
241 | merged = reg; | |
242 | } | |
243 | u = MIN(uaddr, reg->userspace_addr); | |
244 | s = MIN(start_addr, reg->guest_phys_addr); | |
245 | e = MAX(pmlast, prlast); | |
246 | uaddr = merged->userspace_addr = u; | |
247 | start_addr = merged->guest_phys_addr = s; | |
248 | size = merged->memory_size = e - s + 1; | |
249 | assert(merged->memory_size); | |
250 | } | |
251 | ||
252 | if (!merged) { | |
253 | struct vhost_memory_region *reg = dev->mem->regions + to; | |
254 | memset(reg, 0, sizeof *reg); | |
255 | reg->memory_size = size; | |
256 | assert(reg->memory_size); | |
257 | reg->guest_phys_addr = start_addr; | |
258 | reg->userspace_addr = uaddr; | |
259 | ++to; | |
260 | } | |
261 | assert(to <= dev->mem->nregions + 1); | |
262 | dev->mem->nregions = to; | |
263 | } | |
264 | ||
265 | static uint64_t vhost_get_log_size(struct vhost_dev *dev) | |
266 | { | |
267 | uint64_t log_size = 0; | |
268 | int i; | |
269 | for (i = 0; i < dev->mem->nregions; ++i) { | |
270 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
271 | uint64_t last = range_get_last(reg->guest_phys_addr, | |
272 | reg->memory_size); | |
273 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
274 | } | |
275 | for (i = 0; i < dev->nvqs; ++i) { | |
276 | struct vhost_virtqueue *vq = dev->vqs + i; | |
277 | uint64_t last = vq->used_phys + vq->used_size - 1; | |
278 | log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); | |
279 | } | |
280 | return log_size; | |
281 | } | |
282 | ||
283 | static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size) | |
284 | { | |
285 | vhost_log_chunk_t *log; | |
286 | uint64_t log_base; | |
6b37a23d | 287 | int r; |
6528499f MA |
288 | |
289 | log = g_malloc0(size * sizeof *log); | |
d5970055 | 290 | log_base = (uint64_t)(unsigned long)log; |
24d1eb33 | 291 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_LOG_BASE, &log_base); |
d5970055 | 292 | assert(r >= 0); |
6b37a23d MT |
293 | /* Sync only the range covered by the old log */ |
294 | if (dev->log_size) { | |
295 | vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); | |
2817b260 | 296 | } |
9e288406 | 297 | g_free(dev->log); |
d5970055 MT |
298 | dev->log = log; |
299 | dev->log_size = size; | |
300 | } | |
301 | ||
302 | static int vhost_verify_ring_mappings(struct vhost_dev *dev, | |
303 | uint64_t start_addr, | |
304 | uint64_t size) | |
305 | { | |
306 | int i; | |
307 | for (i = 0; i < dev->nvqs; ++i) { | |
308 | struct vhost_virtqueue *vq = dev->vqs + i; | |
a8170e5e | 309 | hwaddr l; |
d5970055 MT |
310 | void *p; |
311 | ||
312 | if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) { | |
313 | continue; | |
314 | } | |
315 | l = vq->ring_size; | |
316 | p = cpu_physical_memory_map(vq->ring_phys, &l, 1); | |
317 | if (!p || l != vq->ring_size) { | |
318 | fprintf(stderr, "Unable to map ring buffer for ring %d\n", i); | |
319 | return -ENOMEM; | |
320 | } | |
321 | if (p != vq->ring) { | |
322 | fprintf(stderr, "Ring buffer relocated for ring %d\n", i); | |
323 | return -EBUSY; | |
324 | } | |
325 | cpu_physical_memory_unmap(p, l, 0, 0); | |
326 | } | |
327 | return 0; | |
328 | } | |
329 | ||
4e789564 MT |
330 | static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev, |
331 | uint64_t start_addr, | |
332 | uint64_t size) | |
333 | { | |
334 | int i, n = dev->mem->nregions; | |
335 | for (i = 0; i < n; ++i) { | |
336 | struct vhost_memory_region *reg = dev->mem->regions + i; | |
337 | if (ranges_overlap(reg->guest_phys_addr, reg->memory_size, | |
338 | start_addr, size)) { | |
339 | return reg; | |
340 | } | |
341 | } | |
342 | return NULL; | |
343 | } | |
344 | ||
345 | static bool vhost_dev_cmp_memory(struct vhost_dev *dev, | |
346 | uint64_t start_addr, | |
347 | uint64_t size, | |
348 | uint64_t uaddr) | |
349 | { | |
350 | struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size); | |
351 | uint64_t reglast; | |
352 | uint64_t memlast; | |
353 | ||
354 | if (!reg) { | |
355 | return true; | |
356 | } | |
357 | ||
358 | reglast = range_get_last(reg->guest_phys_addr, reg->memory_size); | |
359 | memlast = range_get_last(start_addr, size); | |
360 | ||
361 | /* Need to extend region? */ | |
362 | if (start_addr < reg->guest_phys_addr || memlast > reglast) { | |
363 | return true; | |
364 | } | |
365 | /* userspace_addr changed? */ | |
366 | return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr; | |
367 | } | |
368 | ||
04097f7c AK |
369 | static void vhost_set_memory(MemoryListener *listener, |
370 | MemoryRegionSection *section, | |
371 | bool add) | |
d5970055 | 372 | { |
04097f7c AK |
373 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
374 | memory_listener); | |
a8170e5e | 375 | hwaddr start_addr = section->offset_within_address_space; |
052e87b0 | 376 | ram_addr_t size = int128_get64(section->size); |
04097f7c | 377 | bool log_dirty = memory_region_is_logging(section->mr); |
d5970055 MT |
378 | int s = offsetof(struct vhost_memory, regions) + |
379 | (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; | |
04097f7c AK |
380 | void *ram; |
381 | ||
7267c094 | 382 | dev->mem = g_realloc(dev->mem, s); |
d5970055 | 383 | |
f5a4e64f | 384 | if (log_dirty) { |
04097f7c | 385 | add = false; |
f5a4e64f MT |
386 | } |
387 | ||
d5970055 MT |
388 | assert(size); |
389 | ||
4e789564 | 390 | /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */ |
d743c382 | 391 | ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region; |
04097f7c AK |
392 | if (add) { |
393 | if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) { | |
4e789564 MT |
394 | /* Region exists with same address. Nothing to do. */ |
395 | return; | |
396 | } | |
397 | } else { | |
398 | if (!vhost_dev_find_reg(dev, start_addr, size)) { | |
399 | /* Removing region that we don't access. Nothing to do. */ | |
400 | return; | |
401 | } | |
402 | } | |
403 | ||
d5970055 | 404 | vhost_dev_unassign_memory(dev, start_addr, size); |
04097f7c | 405 | if (add) { |
d5970055 | 406 | /* Add given mapping, merging adjacent regions if any */ |
04097f7c | 407 | vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram); |
d5970055 MT |
408 | } else { |
409 | /* Remove old mapping for this memory, if any. */ | |
410 | vhost_dev_unassign_memory(dev, start_addr, size); | |
411 | } | |
af603142 NB |
412 | dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); |
413 | dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); | |
414 | dev->memory_changed = true; | |
415 | } | |
416 | ||
417 | static bool vhost_section(MemoryRegionSection *section) | |
418 | { | |
419 | return memory_region_is_ram(section->mr); | |
420 | } | |
421 | ||
422 | static void vhost_begin(MemoryListener *listener) | |
423 | { | |
424 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
425 | memory_listener); | |
426 | dev->mem_changed_end_addr = 0; | |
427 | dev->mem_changed_start_addr = -1; | |
428 | } | |
d5970055 | 429 | |
af603142 NB |
430 | static void vhost_commit(MemoryListener *listener) |
431 | { | |
432 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, | |
433 | memory_listener); | |
434 | hwaddr start_addr = 0; | |
435 | ram_addr_t size = 0; | |
436 | uint64_t log_size; | |
437 | int r; | |
438 | ||
439 | if (!dev->memory_changed) { | |
440 | return; | |
441 | } | |
d5970055 MT |
442 | if (!dev->started) { |
443 | return; | |
444 | } | |
af603142 NB |
445 | if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { |
446 | return; | |
447 | } | |
d5970055 MT |
448 | |
449 | if (dev->started) { | |
af603142 NB |
450 | start_addr = dev->mem_changed_start_addr; |
451 | size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; | |
452 | ||
d5970055 MT |
453 | r = vhost_verify_ring_mappings(dev, start_addr, size); |
454 | assert(r >= 0); | |
455 | } | |
456 | ||
457 | if (!dev->log_enabled) { | |
24d1eb33 | 458 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_MEM_TABLE, dev->mem); |
d5970055 | 459 | assert(r >= 0); |
af603142 | 460 | dev->memory_changed = false; |
d5970055 MT |
461 | return; |
462 | } | |
463 | log_size = vhost_get_log_size(dev); | |
464 | /* We allocate an extra 4K bytes to log, | |
465 | * to reduce the * number of reallocations. */ | |
466 | #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) | |
467 | /* To log more, must increase log size before table update. */ | |
468 | if (dev->log_size < log_size) { | |
469 | vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); | |
470 | } | |
24d1eb33 | 471 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_MEM_TABLE, dev->mem); |
d5970055 MT |
472 | assert(r >= 0); |
473 | /* To log less, can only decrease log size after table update. */ | |
474 | if (dev->log_size > log_size + VHOST_LOG_BUFFER) { | |
475 | vhost_dev_log_resize(dev, log_size); | |
476 | } | |
af603142 | 477 | dev->memory_changed = false; |
50c1e149 AK |
478 | } |
479 | ||
04097f7c AK |
480 | static void vhost_region_add(MemoryListener *listener, |
481 | MemoryRegionSection *section) | |
482 | { | |
2817b260 AK |
483 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
484 | memory_listener); | |
485 | ||
c49450b9 AK |
486 | if (!vhost_section(section)) { |
487 | return; | |
488 | } | |
489 | ||
2817b260 AK |
490 | ++dev->n_mem_sections; |
491 | dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections, | |
492 | dev->n_mem_sections); | |
493 | dev->mem_sections[dev->n_mem_sections - 1] = *section; | |
dfde4e6e | 494 | memory_region_ref(section->mr); |
04097f7c AK |
495 | vhost_set_memory(listener, section, true); |
496 | } | |
497 | ||
498 | static void vhost_region_del(MemoryListener *listener, | |
499 | MemoryRegionSection *section) | |
500 | { | |
2817b260 AK |
501 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
502 | memory_listener); | |
503 | int i; | |
504 | ||
c49450b9 AK |
505 | if (!vhost_section(section)) { |
506 | return; | |
507 | } | |
508 | ||
04097f7c | 509 | vhost_set_memory(listener, section, false); |
dfde4e6e | 510 | memory_region_unref(section->mr); |
2817b260 AK |
511 | for (i = 0; i < dev->n_mem_sections; ++i) { |
512 | if (dev->mem_sections[i].offset_within_address_space | |
513 | == section->offset_within_address_space) { | |
514 | --dev->n_mem_sections; | |
515 | memmove(&dev->mem_sections[i], &dev->mem_sections[i+1], | |
637f7a6a | 516 | (dev->n_mem_sections - i) * sizeof(*dev->mem_sections)); |
2817b260 AK |
517 | break; |
518 | } | |
519 | } | |
04097f7c AK |
520 | } |
521 | ||
50c1e149 AK |
522 | static void vhost_region_nop(MemoryListener *listener, |
523 | MemoryRegionSection *section) | |
524 | { | |
525 | } | |
526 | ||
d5970055 MT |
527 | static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
528 | struct vhost_virtqueue *vq, | |
529 | unsigned idx, bool enable_log) | |
530 | { | |
531 | struct vhost_vring_addr addr = { | |
532 | .index = idx, | |
2b3af999 SW |
533 | .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
534 | .avail_user_addr = (uint64_t)(unsigned long)vq->avail, | |
535 | .used_user_addr = (uint64_t)(unsigned long)vq->used, | |
d5970055 MT |
536 | .log_guest_addr = vq->used_phys, |
537 | .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, | |
538 | }; | |
24d1eb33 | 539 | int r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_ADDR, &addr); |
d5970055 MT |
540 | if (r < 0) { |
541 | return -errno; | |
542 | } | |
543 | return 0; | |
544 | } | |
545 | ||
546 | static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log) | |
547 | { | |
548 | uint64_t features = dev->acked_features; | |
549 | int r; | |
550 | if (enable_log) { | |
551 | features |= 0x1 << VHOST_F_LOG_ALL; | |
552 | } | |
24d1eb33 | 553 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_FEATURES, &features); |
d5970055 MT |
554 | return r < 0 ? -errno : 0; |
555 | } | |
556 | ||
557 | static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) | |
558 | { | |
559 | int r, t, i; | |
560 | r = vhost_dev_set_features(dev, enable_log); | |
561 | if (r < 0) { | |
562 | goto err_features; | |
563 | } | |
564 | for (i = 0; i < dev->nvqs; ++i) { | |
565 | r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
566 | enable_log); | |
567 | if (r < 0) { | |
568 | goto err_vq; | |
569 | } | |
570 | } | |
571 | return 0; | |
572 | err_vq: | |
573 | for (; i >= 0; --i) { | |
574 | t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i, | |
575 | dev->log_enabled); | |
576 | assert(t >= 0); | |
577 | } | |
578 | t = vhost_dev_set_features(dev, dev->log_enabled); | |
579 | assert(t >= 0); | |
580 | err_features: | |
581 | return r; | |
582 | } | |
583 | ||
04097f7c | 584 | static int vhost_migration_log(MemoryListener *listener, int enable) |
d5970055 | 585 | { |
04097f7c AK |
586 | struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
587 | memory_listener); | |
d5970055 MT |
588 | int r; |
589 | if (!!enable == dev->log_enabled) { | |
590 | return 0; | |
591 | } | |
592 | if (!dev->started) { | |
593 | dev->log_enabled = enable; | |
594 | return 0; | |
595 | } | |
596 | if (!enable) { | |
597 | r = vhost_dev_set_log(dev, false); | |
598 | if (r < 0) { | |
599 | return r; | |
600 | } | |
9e288406 | 601 | g_free(dev->log); |
d5970055 MT |
602 | dev->log = NULL; |
603 | dev->log_size = 0; | |
604 | } else { | |
605 | vhost_dev_log_resize(dev, vhost_get_log_size(dev)); | |
606 | r = vhost_dev_set_log(dev, true); | |
607 | if (r < 0) { | |
608 | return r; | |
609 | } | |
610 | } | |
611 | dev->log_enabled = enable; | |
612 | return 0; | |
613 | } | |
614 | ||
04097f7c AK |
615 | static void vhost_log_global_start(MemoryListener *listener) |
616 | { | |
617 | int r; | |
618 | ||
619 | r = vhost_migration_log(listener, true); | |
620 | if (r < 0) { | |
621 | abort(); | |
622 | } | |
623 | } | |
624 | ||
625 | static void vhost_log_global_stop(MemoryListener *listener) | |
626 | { | |
627 | int r; | |
628 | ||
629 | r = vhost_migration_log(listener, false); | |
630 | if (r < 0) { | |
631 | abort(); | |
632 | } | |
633 | } | |
634 | ||
635 | static void vhost_log_start(MemoryListener *listener, | |
636 | MemoryRegionSection *section) | |
637 | { | |
638 | /* FIXME: implement */ | |
639 | } | |
640 | ||
641 | static void vhost_log_stop(MemoryListener *listener, | |
642 | MemoryRegionSection *section) | |
643 | { | |
644 | /* FIXME: implement */ | |
645 | } | |
646 | ||
f56a1247 | 647 | static int vhost_virtqueue_start(struct vhost_dev *dev, |
d5970055 MT |
648 | struct VirtIODevice *vdev, |
649 | struct vhost_virtqueue *vq, | |
650 | unsigned idx) | |
651 | { | |
a8170e5e | 652 | hwaddr s, l, a; |
d5970055 | 653 | int r; |
a9f98bb5 | 654 | int vhost_vq_index = idx - dev->vq_index; |
d5970055 | 655 | struct vhost_vring_file file = { |
a9f98bb5 | 656 | .index = vhost_vq_index |
d5970055 MT |
657 | }; |
658 | struct vhost_vring_state state = { | |
a9f98bb5 | 659 | .index = vhost_vq_index |
d5970055 MT |
660 | }; |
661 | struct VirtQueue *vvq = virtio_get_queue(vdev, idx); | |
662 | ||
a9f98bb5 JW |
663 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
664 | ||
d5970055 | 665 | vq->num = state.num = virtio_queue_get_num(vdev, idx); |
24d1eb33 | 666 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_NUM, &state); |
d5970055 MT |
667 | if (r) { |
668 | return -errno; | |
669 | } | |
670 | ||
671 | state.num = virtio_queue_get_last_avail_idx(vdev, idx); | |
24d1eb33 | 672 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_BASE, &state); |
d5970055 MT |
673 | if (r) { |
674 | return -errno; | |
675 | } | |
676 | ||
677 | s = l = virtio_queue_get_desc_size(vdev, idx); | |
678 | a = virtio_queue_get_desc_addr(vdev, idx); | |
679 | vq->desc = cpu_physical_memory_map(a, &l, 0); | |
680 | if (!vq->desc || l != s) { | |
681 | r = -ENOMEM; | |
682 | goto fail_alloc_desc; | |
683 | } | |
684 | s = l = virtio_queue_get_avail_size(vdev, idx); | |
685 | a = virtio_queue_get_avail_addr(vdev, idx); | |
686 | vq->avail = cpu_physical_memory_map(a, &l, 0); | |
687 | if (!vq->avail || l != s) { | |
688 | r = -ENOMEM; | |
689 | goto fail_alloc_avail; | |
690 | } | |
691 | vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); | |
692 | vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); | |
693 | vq->used = cpu_physical_memory_map(a, &l, 1); | |
694 | if (!vq->used || l != s) { | |
695 | r = -ENOMEM; | |
696 | goto fail_alloc_used; | |
697 | } | |
698 | ||
699 | vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx); | |
700 | vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx); | |
701 | vq->ring = cpu_physical_memory_map(a, &l, 1); | |
702 | if (!vq->ring || l != s) { | |
703 | r = -ENOMEM; | |
704 | goto fail_alloc_ring; | |
705 | } | |
706 | ||
a9f98bb5 | 707 | r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
d5970055 MT |
708 | if (r < 0) { |
709 | r = -errno; | |
710 | goto fail_alloc; | |
711 | } | |
a9f98bb5 | 712 | |
d5970055 | 713 | file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
24d1eb33 | 714 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_KICK, &file); |
d5970055 | 715 | if (r) { |
c8852121 | 716 | r = -errno; |
d5970055 MT |
717 | goto fail_kick; |
718 | } | |
719 | ||
f56a1247 MT |
720 | /* Clear and discard previous events if any. */ |
721 | event_notifier_test_and_clear(&vq->masked_notifier); | |
d5970055 MT |
722 | |
723 | return 0; | |
724 | ||
d5970055 | 725 | fail_kick: |
d5970055 MT |
726 | fail_alloc: |
727 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
728 | 0, 0); | |
729 | fail_alloc_ring: | |
730 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
731 | 0, 0); | |
732 | fail_alloc_used: | |
733 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
734 | 0, 0); | |
735 | fail_alloc_avail: | |
736 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
737 | 0, 0); | |
738 | fail_alloc_desc: | |
739 | return r; | |
740 | } | |
741 | ||
f56a1247 | 742 | static void vhost_virtqueue_stop(struct vhost_dev *dev, |
d5970055 MT |
743 | struct VirtIODevice *vdev, |
744 | struct vhost_virtqueue *vq, | |
745 | unsigned idx) | |
746 | { | |
747 | struct vhost_vring_state state = { | |
a9f98bb5 | 748 | .index = idx - dev->vq_index |
d5970055 MT |
749 | }; |
750 | int r; | |
a9f98bb5 | 751 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); |
24d1eb33 | 752 | r = dev->vhost_ops->vhost_call(dev, VHOST_GET_VRING_BASE, &state); |
d5970055 MT |
753 | if (r < 0) { |
754 | fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r); | |
755 | fflush(stderr); | |
756 | } | |
757 | virtio_queue_set_last_avail_idx(vdev, idx, state.num); | |
3561ba14 | 758 | virtio_queue_invalidate_signalled_used(vdev, idx); |
d5970055 MT |
759 | assert (r >= 0); |
760 | cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx), | |
761 | 0, virtio_queue_get_ring_size(vdev, idx)); | |
762 | cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx), | |
763 | 1, virtio_queue_get_used_size(vdev, idx)); | |
764 | cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx), | |
765 | 0, virtio_queue_get_avail_size(vdev, idx)); | |
766 | cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx), | |
767 | 0, virtio_queue_get_desc_size(vdev, idx)); | |
768 | } | |
769 | ||
80a1ea37 AK |
770 | static void vhost_eventfd_add(MemoryListener *listener, |
771 | MemoryRegionSection *section, | |
753d5e14 | 772 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
773 | { |
774 | } | |
775 | ||
776 | static void vhost_eventfd_del(MemoryListener *listener, | |
777 | MemoryRegionSection *section, | |
753d5e14 | 778 | bool match_data, uint64_t data, EventNotifier *e) |
80a1ea37 AK |
779 | { |
780 | } | |
781 | ||
f56a1247 MT |
782 | static int vhost_virtqueue_init(struct vhost_dev *dev, |
783 | struct vhost_virtqueue *vq, int n) | |
784 | { | |
785 | struct vhost_vring_file file = { | |
786 | .index = n, | |
787 | }; | |
788 | int r = event_notifier_init(&vq->masked_notifier, 0); | |
789 | if (r < 0) { | |
790 | return r; | |
791 | } | |
792 | ||
793 | file.fd = event_notifier_get_fd(&vq->masked_notifier); | |
24d1eb33 | 794 | r = dev->vhost_ops->vhost_call(dev, VHOST_SET_VRING_CALL, &file); |
f56a1247 MT |
795 | if (r) { |
796 | r = -errno; | |
797 | goto fail_call; | |
798 | } | |
799 | return 0; | |
800 | fail_call: | |
801 | event_notifier_cleanup(&vq->masked_notifier); | |
802 | return r; | |
803 | } | |
804 | ||
805 | static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) | |
806 | { | |
807 | event_notifier_cleanup(&vq->masked_notifier); | |
808 | } | |
809 | ||
81647a65 | 810 | int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
1241ed94 | 811 | bool force) |
d5970055 MT |
812 | { |
813 | uint64_t features; | |
f56a1247 | 814 | int i, r; |
81647a65 | 815 | |
24d1eb33 NN |
816 | if (hdev->vhost_ops->vhost_backend_init(hdev, opaque) < 0) { |
817 | return -errno; | |
818 | } | |
819 | ||
820 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_OWNER, NULL); | |
d5970055 MT |
821 | if (r < 0) { |
822 | goto fail; | |
823 | } | |
824 | ||
24d1eb33 | 825 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_GET_FEATURES, &features); |
d5970055 MT |
826 | if (r < 0) { |
827 | goto fail; | |
828 | } | |
f56a1247 MT |
829 | |
830 | for (i = 0; i < hdev->nvqs; ++i) { | |
831 | r = vhost_virtqueue_init(hdev, hdev->vqs + i, i); | |
832 | if (r < 0) { | |
833 | goto fail_vq; | |
834 | } | |
835 | } | |
d5970055 MT |
836 | hdev->features = features; |
837 | ||
04097f7c | 838 | hdev->memory_listener = (MemoryListener) { |
50c1e149 AK |
839 | .begin = vhost_begin, |
840 | .commit = vhost_commit, | |
04097f7c AK |
841 | .region_add = vhost_region_add, |
842 | .region_del = vhost_region_del, | |
50c1e149 | 843 | .region_nop = vhost_region_nop, |
04097f7c AK |
844 | .log_start = vhost_log_start, |
845 | .log_stop = vhost_log_stop, | |
846 | .log_sync = vhost_log_sync, | |
847 | .log_global_start = vhost_log_global_start, | |
848 | .log_global_stop = vhost_log_global_stop, | |
80a1ea37 AK |
849 | .eventfd_add = vhost_eventfd_add, |
850 | .eventfd_del = vhost_eventfd_del, | |
72e22d2f | 851 | .priority = 10 |
04097f7c | 852 | }; |
7267c094 | 853 | hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
2817b260 AK |
854 | hdev->n_mem_sections = 0; |
855 | hdev->mem_sections = NULL; | |
d5970055 MT |
856 | hdev->log = NULL; |
857 | hdev->log_size = 0; | |
858 | hdev->log_enabled = false; | |
859 | hdev->started = false; | |
af603142 | 860 | hdev->memory_changed = false; |
f6790af6 | 861 | memory_listener_register(&hdev->memory_listener, &address_space_memory); |
5430a28f | 862 | hdev->force = force; |
d5970055 | 863 | return 0; |
f56a1247 MT |
864 | fail_vq: |
865 | while (--i >= 0) { | |
866 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
867 | } | |
d5970055 MT |
868 | fail: |
869 | r = -errno; | |
24d1eb33 | 870 | hdev->vhost_ops->vhost_backend_cleanup(hdev); |
d5970055 MT |
871 | return r; |
872 | } | |
873 | ||
874 | void vhost_dev_cleanup(struct vhost_dev *hdev) | |
875 | { | |
f56a1247 MT |
876 | int i; |
877 | for (i = 0; i < hdev->nvqs; ++i) { | |
878 | vhost_virtqueue_cleanup(hdev->vqs + i); | |
879 | } | |
04097f7c | 880 | memory_listener_unregister(&hdev->memory_listener); |
7267c094 | 881 | g_free(hdev->mem); |
2817b260 | 882 | g_free(hdev->mem_sections); |
24d1eb33 | 883 | hdev->vhost_ops->vhost_backend_cleanup(hdev); |
d5970055 MT |
884 | } |
885 | ||
5430a28f MT |
886 | bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev) |
887 | { | |
1c819449 FK |
888 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
889 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
890 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
891 | ||
892 | return !k->query_guest_notifiers || | |
893 | k->query_guest_notifiers(qbus->parent) || | |
894 | hdev->force; | |
5430a28f MT |
895 | } |
896 | ||
b0b3db79 MT |
897 | /* Stop processing guest IO notifications in qemu. |
898 | * Start processing them in vhost in kernel. | |
899 | */ | |
900 | int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
901 | { | |
1c819449 FK |
902 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
903 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
904 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 | 905 | int i, r; |
1c819449 | 906 | if (!k->set_host_notifier) { |
b0b3db79 MT |
907 | fprintf(stderr, "binding does not support host notifiers\n"); |
908 | r = -ENOSYS; | |
909 | goto fail; | |
910 | } | |
911 | ||
912 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 913 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, true); |
b0b3db79 MT |
914 | if (r < 0) { |
915 | fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r); | |
916 | goto fail_vq; | |
917 | } | |
918 | } | |
919 | ||
920 | return 0; | |
921 | fail_vq: | |
922 | while (--i >= 0) { | |
1c819449 | 923 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
924 | if (r < 0) { |
925 | fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r); | |
926 | fflush(stderr); | |
927 | } | |
928 | assert (r >= 0); | |
929 | } | |
930 | fail: | |
931 | return r; | |
932 | } | |
933 | ||
934 | /* Stop processing guest IO notifications in vhost. | |
935 | * Start processing them in qemu. | |
936 | * This might actually run the qemu handlers right away, | |
937 | * so virtio in qemu must be completely setup when this is called. | |
938 | */ | |
939 | void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) | |
940 | { | |
1c819449 FK |
941 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
942 | VirtioBusState *vbus = VIRTIO_BUS(qbus); | |
943 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); | |
b0b3db79 MT |
944 | int i, r; |
945 | ||
946 | for (i = 0; i < hdev->nvqs; ++i) { | |
1c819449 | 947 | r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false); |
b0b3db79 MT |
948 | if (r < 0) { |
949 | fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r); | |
950 | fflush(stderr); | |
951 | } | |
952 | assert (r >= 0); | |
953 | } | |
954 | } | |
955 | ||
f56a1247 MT |
956 | /* Test and clear event pending status. |
957 | * Should be called after unmask to avoid losing events. | |
958 | */ | |
959 | bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) | |
960 | { | |
a9f98bb5 | 961 | struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
f56a1247 | 962 | assert(hdev->started); |
a9f98bb5 | 963 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
964 | return event_notifier_test_and_clear(&vq->masked_notifier); |
965 | } | |
966 | ||
967 | /* Mask/unmask events from this vq. */ | |
968 | void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, | |
969 | bool mask) | |
970 | { | |
971 | struct VirtQueue *vvq = virtio_get_queue(vdev, n); | |
a9f98bb5 | 972 | int r, index = n - hdev->vq_index; |
f56a1247 MT |
973 | |
974 | assert(hdev->started); | |
a9f98bb5 | 975 | assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
f56a1247 MT |
976 | |
977 | struct vhost_vring_file file = { | |
a9f98bb5 | 978 | .index = index |
f56a1247 MT |
979 | }; |
980 | if (mask) { | |
a9f98bb5 | 981 | file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
f56a1247 MT |
982 | } else { |
983 | file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); | |
984 | } | |
24d1eb33 | 985 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_VRING_CALL, &file); |
f56a1247 MT |
986 | assert(r >= 0); |
987 | } | |
988 | ||
2e6d46d7 NN |
989 | unsigned vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
990 | unsigned features) | |
991 | { | |
992 | const int *bit = feature_bits; | |
993 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
994 | unsigned bit_mask = (1 << *bit); | |
995 | if (!(hdev->features & bit_mask)) { | |
996 | features &= ~bit_mask; | |
997 | } | |
998 | bit++; | |
999 | } | |
1000 | return features; | |
1001 | } | |
1002 | ||
1003 | void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, | |
1004 | unsigned features) | |
1005 | { | |
1006 | const int *bit = feature_bits; | |
1007 | while (*bit != VHOST_INVALID_FEATURE_BIT) { | |
1008 | unsigned bit_mask = (1 << *bit); | |
1009 | if (features & bit_mask) { | |
1010 | hdev->acked_features |= bit_mask; | |
1011 | } | |
1012 | bit++; | |
1013 | } | |
1014 | } | |
1015 | ||
b0b3db79 | 1016 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1017 | int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
1018 | { | |
1019 | int i, r; | |
24f4fe34 MT |
1020 | |
1021 | hdev->started = true; | |
1022 | ||
d5970055 MT |
1023 | r = vhost_dev_set_features(hdev, hdev->log_enabled); |
1024 | if (r < 0) { | |
54dd9321 | 1025 | goto fail_features; |
d5970055 | 1026 | } |
24d1eb33 | 1027 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_MEM_TABLE, hdev->mem); |
d5970055 MT |
1028 | if (r < 0) { |
1029 | r = -errno; | |
54dd9321 | 1030 | goto fail_mem; |
d5970055 | 1031 | } |
d154e0ba | 1032 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1033 | r = vhost_virtqueue_start(hdev, |
a9f98bb5 JW |
1034 | vdev, |
1035 | hdev->vqs + i, | |
1036 | hdev->vq_index + i); | |
d154e0ba MT |
1037 | if (r < 0) { |
1038 | goto fail_vq; | |
1039 | } | |
1040 | } | |
1041 | ||
d5970055 MT |
1042 | if (hdev->log_enabled) { |
1043 | hdev->log_size = vhost_get_log_size(hdev); | |
1044 | hdev->log = hdev->log_size ? | |
7267c094 | 1045 | g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL; |
24d1eb33 | 1046 | r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_LOG_BASE, hdev->log); |
d5970055 MT |
1047 | if (r < 0) { |
1048 | r = -errno; | |
54dd9321 | 1049 | goto fail_log; |
d5970055 MT |
1050 | } |
1051 | } | |
d154e0ba | 1052 | |
d5970055 | 1053 | return 0; |
54dd9321 | 1054 | fail_log: |
d5970055 MT |
1055 | fail_vq: |
1056 | while (--i >= 0) { | |
f56a1247 | 1057 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1058 | vdev, |
1059 | hdev->vqs + i, | |
1060 | hdev->vq_index + i); | |
d5970055 | 1061 | } |
a9f98bb5 | 1062 | i = hdev->nvqs; |
54dd9321 MT |
1063 | fail_mem: |
1064 | fail_features: | |
24f4fe34 MT |
1065 | |
1066 | hdev->started = false; | |
d5970055 MT |
1067 | return r; |
1068 | } | |
1069 | ||
b0b3db79 | 1070 | /* Host notifiers must be enabled at this point. */ |
d5970055 MT |
1071 | void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
1072 | { | |
a9f98bb5 | 1073 | int i; |
54dd9321 | 1074 | |
d5970055 | 1075 | for (i = 0; i < hdev->nvqs; ++i) { |
f56a1247 | 1076 | vhost_virtqueue_stop(hdev, |
a9f98bb5 JW |
1077 | vdev, |
1078 | hdev->vqs + i, | |
1079 | hdev->vq_index + i); | |
d5970055 | 1080 | } |
6b37a23d | 1081 | vhost_log_sync_range(hdev, 0, ~0x0ull); |
54dd9321 | 1082 | |
d5970055 | 1083 | hdev->started = false; |
7267c094 | 1084 | g_free(hdev->log); |
c1be973a | 1085 | hdev->log = NULL; |
d5970055 MT |
1086 | hdev->log_size = 0; |
1087 | } | |
a9f98bb5 | 1088 |