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Commit | Line | Data |
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910b2576 DH |
1 | /* |
2 | * Virtio MEM device | |
3 | * | |
4 | * Copyright (C) 2020 Red Hat, Inc. | |
5 | * | |
6 | * Authors: | |
7 | * David Hildenbrand <david@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. | |
10 | * See the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
13 | #include "qemu/osdep.h" | |
910b2576 DH |
14 | #include "qemu/iov.h" |
15 | #include "qemu/cutils.h" | |
16 | #include "qemu/error-report.h" | |
17 | #include "qemu/units.h" | |
18 | #include "sysemu/numa.h" | |
19 | #include "sysemu/sysemu.h" | |
20 | #include "sysemu/reset.h" | |
21 | #include "hw/virtio/virtio.h" | |
22 | #include "hw/virtio/virtio-bus.h" | |
23 | #include "hw/virtio/virtio-access.h" | |
24 | #include "hw/virtio/virtio-mem.h" | |
25 | #include "qapi/error.h" | |
26 | #include "qapi/visitor.h" | |
27 | #include "exec/ram_addr.h" | |
28 | #include "migration/misc.h" | |
29 | #include "hw/boards.h" | |
30 | #include "hw/qdev-properties.h" | |
2becc36a | 31 | #include CONFIG_DEVICES |
43e54950 | 32 | #include "trace.h" |
910b2576 | 33 | |
3b95a71b DH |
34 | static const VMStateDescription vmstate_virtio_mem_device_early; |
35 | ||
23ad8dec DH |
36 | /* |
37 | * We only had legacy x86 guests that did not support | |
38 | * VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE. Other targets don't have legacy guests. | |
39 | */ | |
40 | #if defined(TARGET_X86_64) || defined(TARGET_I386) | |
41 | #define VIRTIO_MEM_HAS_LEGACY_GUESTS | |
42 | #endif | |
43 | ||
910b2576 | 44 | /* |
228957fe DH |
45 | * Let's not allow blocks smaller than 1 MiB, for example, to keep the tracking |
46 | * bitmap small. | |
910b2576 | 47 | */ |
228957fe DH |
48 | #define VIRTIO_MEM_MIN_BLOCK_SIZE ((uint32_t)(1 * MiB)) |
49 | ||
1263615e GS |
50 | static uint32_t virtio_mem_default_thp_size(void) |
51 | { | |
52 | uint32_t default_thp_size = VIRTIO_MEM_MIN_BLOCK_SIZE; | |
53 | ||
54 | #if defined(__x86_64__) || defined(__arm__) || defined(__powerpc64__) | |
55 | default_thp_size = 2 * MiB; | |
56 | #elif defined(__aarch64__) | |
8e3b0cbb | 57 | if (qemu_real_host_page_size() == 4 * KiB) { |
1263615e | 58 | default_thp_size = 2 * MiB; |
8e3b0cbb | 59 | } else if (qemu_real_host_page_size() == 16 * KiB) { |
1263615e | 60 | default_thp_size = 32 * MiB; |
8e3b0cbb | 61 | } else if (qemu_real_host_page_size() == 64 * KiB) { |
1263615e GS |
62 | default_thp_size = 512 * MiB; |
63 | } | |
228957fe DH |
64 | #endif |
65 | ||
1263615e GS |
66 | return default_thp_size; |
67 | } | |
68 | ||
228957fe DH |
69 | /* |
70 | * We want to have a reasonable default block size such that | |
71 | * 1. We avoid splitting THPs when unplugging memory, which degrades | |
72 | * performance. | |
73 | * 2. We avoid placing THPs for plugged blocks that also cover unplugged | |
74 | * blocks. | |
75 | * | |
76 | * The actual THP size might differ between Linux kernels, so we try to probe | |
77 | * it. In the future (if we ever run into issues regarding 2.), we might want | |
78 | * to disable THP in case we fail to properly probe the THP size, or if the | |
79 | * block size is configured smaller than the THP size. | |
80 | */ | |
81 | static uint32_t thp_size; | |
82 | ||
83 | #define HPAGE_PMD_SIZE_PATH "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size" | |
84 | static uint32_t virtio_mem_thp_size(void) | |
85 | { | |
86 | gchar *content = NULL; | |
87 | const char *endptr; | |
88 | uint64_t tmp; | |
89 | ||
90 | if (thp_size) { | |
91 | return thp_size; | |
92 | } | |
93 | ||
94 | /* | |
95 | * Try to probe the actual THP size, fallback to (sane but eventually | |
96 | * incorrect) default sizes. | |
97 | */ | |
98 | if (g_file_get_contents(HPAGE_PMD_SIZE_PATH, &content, NULL, NULL) && | |
99 | !qemu_strtou64(content, &endptr, 0, &tmp) && | |
100 | (!endptr || *endptr == '\n')) { | |
1263615e GS |
101 | /* Sanity-check the value and fallback to something reasonable. */ |
102 | if (!tmp || !is_power_of_2(tmp)) { | |
228957fe DH |
103 | warn_report("Read unsupported THP size: %" PRIx64, tmp); |
104 | } else { | |
105 | thp_size = tmp; | |
106 | } | |
107 | } | |
108 | ||
109 | if (!thp_size) { | |
1263615e | 110 | thp_size = virtio_mem_default_thp_size(); |
228957fe DH |
111 | warn_report("Could not detect THP size, falling back to %" PRIx64 |
112 | " MiB.", thp_size / MiB); | |
113 | } | |
114 | ||
115 | g_free(content); | |
116 | return thp_size; | |
117 | } | |
118 | ||
119 | static uint64_t virtio_mem_default_block_size(RAMBlock *rb) | |
120 | { | |
121 | const uint64_t page_size = qemu_ram_pagesize(rb); | |
122 | ||
123 | /* We can have hugetlbfs with a page size smaller than the THP size. */ | |
8e3b0cbb | 124 | if (page_size == qemu_real_host_page_size()) { |
228957fe DH |
125 | return MAX(page_size, virtio_mem_thp_size()); |
126 | } | |
127 | return MAX(page_size, VIRTIO_MEM_MIN_BLOCK_SIZE); | |
128 | } | |
129 | ||
23ad8dec DH |
130 | #if defined(VIRTIO_MEM_HAS_LEGACY_GUESTS) |
131 | static bool virtio_mem_has_shared_zeropage(RAMBlock *rb) | |
132 | { | |
133 | /* | |
134 | * We only have a guaranteed shared zeropage on ordinary MAP_PRIVATE | |
135 | * anonymous RAM. In any other case, reading unplugged *can* populate a | |
136 | * fresh page, consuming actual memory. | |
137 | */ | |
138 | return !qemu_ram_is_shared(rb) && rb->fd < 0 && | |
8e3b0cbb | 139 | qemu_ram_pagesize(rb) == qemu_real_host_page_size(); |
23ad8dec DH |
140 | } |
141 | #endif /* VIRTIO_MEM_HAS_LEGACY_GUESTS */ | |
142 | ||
910b2576 DH |
143 | /* |
144 | * Size the usable region bigger than the requested size if possible. Esp. | |
145 | * Linux guests will only add (aligned) memory blocks in case they fully | |
146 | * fit into the usable region, but plug+online only a subset of the pages. | |
147 | * The memory block size corresponds mostly to the section size. | |
148 | * | |
149 | * This allows e.g., to add 20MB with a section size of 128MB on x86_64, and | |
b1b87327 | 150 | * a section size of 512MB on arm64 (as long as the start address is properly |
910b2576 DH |
151 | * aligned, similar to ordinary DIMMs). |
152 | * | |
153 | * We can change this at any time and maybe even make it configurable if | |
154 | * necessary (as the section size can change). But it's more likely that the | |
155 | * section size will rather get smaller and not bigger over time. | |
156 | */ | |
157 | #if defined(TARGET_X86_64) || defined(TARGET_I386) | |
158 | #define VIRTIO_MEM_USABLE_EXTENT (2 * (128 * MiB)) | |
b1b87327 GS |
159 | #elif defined(TARGET_ARM) |
160 | #define VIRTIO_MEM_USABLE_EXTENT (2 * (512 * MiB)) | |
910b2576 DH |
161 | #else |
162 | #error VIRTIO_MEM_USABLE_EXTENT not defined | |
163 | #endif | |
164 | ||
165 | static bool virtio_mem_is_busy(void) | |
166 | { | |
167 | /* | |
168 | * Postcopy cannot handle concurrent discards and we don't want to migrate | |
169 | * pages on-demand with stale content when plugging new blocks. | |
0bc7806c DH |
170 | * |
171 | * For precopy, we don't want unplugged blocks in our migration stream, and | |
172 | * when plugging new blocks, the page content might differ between source | |
173 | * and destination (observable by the guest when not initializing pages | |
174 | * after plugging them) until we're running on the destination (as we didn't | |
175 | * migrate these blocks when they were unplugged). | |
910b2576 | 176 | */ |
0bc7806c | 177 | return migration_in_incoming_postcopy() || !migration_is_idle(); |
910b2576 DH |
178 | } |
179 | ||
7a9d5d02 DH |
180 | typedef int (*virtio_mem_range_cb)(const VirtIOMEM *vmem, void *arg, |
181 | uint64_t offset, uint64_t size); | |
182 | ||
183 | static int virtio_mem_for_each_unplugged_range(const VirtIOMEM *vmem, void *arg, | |
184 | virtio_mem_range_cb cb) | |
185 | { | |
186 | unsigned long first_zero_bit, last_zero_bit; | |
187 | uint64_t offset, size; | |
188 | int ret = 0; | |
189 | ||
190 | first_zero_bit = find_first_zero_bit(vmem->bitmap, vmem->bitmap_size); | |
191 | while (first_zero_bit < vmem->bitmap_size) { | |
192 | offset = first_zero_bit * vmem->block_size; | |
193 | last_zero_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, | |
194 | first_zero_bit + 1) - 1; | |
195 | size = (last_zero_bit - first_zero_bit + 1) * vmem->block_size; | |
196 | ||
197 | ret = cb(vmem, arg, offset, size); | |
198 | if (ret) { | |
199 | break; | |
200 | } | |
201 | first_zero_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, | |
202 | last_zero_bit + 2); | |
203 | } | |
204 | return ret; | |
205 | } | |
206 | ||
d71920d4 DH |
207 | static int virtio_mem_for_each_plugged_range(const VirtIOMEM *vmem, void *arg, |
208 | virtio_mem_range_cb cb) | |
209 | { | |
210 | unsigned long first_bit, last_bit; | |
211 | uint64_t offset, size; | |
212 | int ret = 0; | |
213 | ||
214 | first_bit = find_first_bit(vmem->bitmap, vmem->bitmap_size); | |
215 | while (first_bit < vmem->bitmap_size) { | |
216 | offset = first_bit * vmem->block_size; | |
217 | last_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, | |
218 | first_bit + 1) - 1; | |
219 | size = (last_bit - first_bit + 1) * vmem->block_size; | |
220 | ||
221 | ret = cb(vmem, arg, offset, size); | |
222 | if (ret) { | |
223 | break; | |
224 | } | |
225 | first_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, | |
226 | last_bit + 2); | |
227 | } | |
228 | return ret; | |
229 | } | |
230 | ||
2044969f DH |
231 | /* |
232 | * Adjust the memory section to cover the intersection with the given range. | |
233 | * | |
234 | * Returns false if the intersection is empty, otherwise returns true. | |
235 | */ | |
82ba778e | 236 | static bool virtio_mem_intersect_memory_section(MemoryRegionSection *s, |
2044969f DH |
237 | uint64_t offset, uint64_t size) |
238 | { | |
239 | uint64_t start = MAX(s->offset_within_region, offset); | |
240 | uint64_t end = MIN(s->offset_within_region + int128_get64(s->size), | |
241 | offset + size); | |
242 | ||
243 | if (end <= start) { | |
244 | return false; | |
245 | } | |
246 | ||
247 | s->offset_within_address_space += start - s->offset_within_region; | |
248 | s->offset_within_region = start; | |
249 | s->size = int128_make64(end - start); | |
250 | return true; | |
251 | } | |
252 | ||
253 | typedef int (*virtio_mem_section_cb)(MemoryRegionSection *s, void *arg); | |
254 | ||
255 | static int virtio_mem_for_each_plugged_section(const VirtIOMEM *vmem, | |
256 | MemoryRegionSection *s, | |
257 | void *arg, | |
258 | virtio_mem_section_cb cb) | |
259 | { | |
260 | unsigned long first_bit, last_bit; | |
261 | uint64_t offset, size; | |
262 | int ret = 0; | |
263 | ||
b11cf32e | 264 | first_bit = s->offset_within_region / vmem->block_size; |
2044969f DH |
265 | first_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, first_bit); |
266 | while (first_bit < vmem->bitmap_size) { | |
267 | MemoryRegionSection tmp = *s; | |
268 | ||
269 | offset = first_bit * vmem->block_size; | |
270 | last_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, | |
271 | first_bit + 1) - 1; | |
272 | size = (last_bit - first_bit + 1) * vmem->block_size; | |
273 | ||
82ba778e | 274 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
2044969f DH |
275 | break; |
276 | } | |
277 | ret = cb(&tmp, arg); | |
278 | if (ret) { | |
279 | break; | |
280 | } | |
281 | first_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, | |
282 | last_bit + 2); | |
283 | } | |
284 | return ret; | |
285 | } | |
286 | ||
372aa6fd DH |
287 | static int virtio_mem_for_each_unplugged_section(const VirtIOMEM *vmem, |
288 | MemoryRegionSection *s, | |
289 | void *arg, | |
290 | virtio_mem_section_cb cb) | |
291 | { | |
292 | unsigned long first_bit, last_bit; | |
293 | uint64_t offset, size; | |
294 | int ret = 0; | |
295 | ||
b11cf32e | 296 | first_bit = s->offset_within_region / vmem->block_size; |
372aa6fd DH |
297 | first_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, first_bit); |
298 | while (first_bit < vmem->bitmap_size) { | |
299 | MemoryRegionSection tmp = *s; | |
300 | ||
301 | offset = first_bit * vmem->block_size; | |
302 | last_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, | |
303 | first_bit + 1) - 1; | |
304 | size = (last_bit - first_bit + 1) * vmem->block_size; | |
305 | ||
82ba778e | 306 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
372aa6fd DH |
307 | break; |
308 | } | |
309 | ret = cb(&tmp, arg); | |
310 | if (ret) { | |
311 | break; | |
312 | } | |
313 | first_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, | |
314 | last_bit + 2); | |
315 | } | |
316 | return ret; | |
317 | } | |
318 | ||
2044969f DH |
319 | static int virtio_mem_notify_populate_cb(MemoryRegionSection *s, void *arg) |
320 | { | |
321 | RamDiscardListener *rdl = arg; | |
322 | ||
323 | return rdl->notify_populate(rdl, s); | |
324 | } | |
325 | ||
326 | static int virtio_mem_notify_discard_cb(MemoryRegionSection *s, void *arg) | |
327 | { | |
328 | RamDiscardListener *rdl = arg; | |
329 | ||
330 | rdl->notify_discard(rdl, s); | |
331 | return 0; | |
332 | } | |
333 | ||
334 | static void virtio_mem_notify_unplug(VirtIOMEM *vmem, uint64_t offset, | |
335 | uint64_t size) | |
336 | { | |
337 | RamDiscardListener *rdl; | |
338 | ||
339 | QLIST_FOREACH(rdl, &vmem->rdl_list, next) { | |
340 | MemoryRegionSection tmp = *rdl->section; | |
341 | ||
82ba778e | 342 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
2044969f DH |
343 | continue; |
344 | } | |
345 | rdl->notify_discard(rdl, &tmp); | |
346 | } | |
347 | } | |
348 | ||
349 | static int virtio_mem_notify_plug(VirtIOMEM *vmem, uint64_t offset, | |
350 | uint64_t size) | |
351 | { | |
352 | RamDiscardListener *rdl, *rdl2; | |
353 | int ret = 0; | |
354 | ||
355 | QLIST_FOREACH(rdl, &vmem->rdl_list, next) { | |
356 | MemoryRegionSection tmp = *rdl->section; | |
357 | ||
82ba778e | 358 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
2044969f DH |
359 | continue; |
360 | } | |
361 | ret = rdl->notify_populate(rdl, &tmp); | |
362 | if (ret) { | |
363 | break; | |
364 | } | |
365 | } | |
366 | ||
367 | if (ret) { | |
368 | /* Notify all already-notified listeners. */ | |
369 | QLIST_FOREACH(rdl2, &vmem->rdl_list, next) { | |
29f1b328 | 370 | MemoryRegionSection tmp = *rdl2->section; |
2044969f DH |
371 | |
372 | if (rdl2 == rdl) { | |
373 | break; | |
374 | } | |
82ba778e | 375 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
2044969f DH |
376 | continue; |
377 | } | |
378 | rdl2->notify_discard(rdl2, &tmp); | |
379 | } | |
380 | } | |
381 | return ret; | |
382 | } | |
383 | ||
384 | static void virtio_mem_notify_unplug_all(VirtIOMEM *vmem) | |
385 | { | |
386 | RamDiscardListener *rdl; | |
387 | ||
388 | if (!vmem->size) { | |
389 | return; | |
390 | } | |
391 | ||
392 | QLIST_FOREACH(rdl, &vmem->rdl_list, next) { | |
393 | if (rdl->double_discard_supported) { | |
394 | rdl->notify_discard(rdl, rdl->section); | |
395 | } else { | |
396 | virtio_mem_for_each_plugged_section(vmem, rdl->section, rdl, | |
397 | virtio_mem_notify_discard_cb); | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
402 | static bool virtio_mem_test_bitmap(const VirtIOMEM *vmem, uint64_t start_gpa, | |
910b2576 DH |
403 | uint64_t size, bool plugged) |
404 | { | |
405 | const unsigned long first_bit = (start_gpa - vmem->addr) / vmem->block_size; | |
406 | const unsigned long last_bit = first_bit + (size / vmem->block_size) - 1; | |
407 | unsigned long found_bit; | |
408 | ||
409 | /* We fake a shorter bitmap to avoid searching too far. */ | |
410 | if (plugged) { | |
411 | found_bit = find_next_zero_bit(vmem->bitmap, last_bit + 1, first_bit); | |
412 | } else { | |
413 | found_bit = find_next_bit(vmem->bitmap, last_bit + 1, first_bit); | |
414 | } | |
415 | return found_bit > last_bit; | |
416 | } | |
417 | ||
418 | static void virtio_mem_set_bitmap(VirtIOMEM *vmem, uint64_t start_gpa, | |
419 | uint64_t size, bool plugged) | |
420 | { | |
421 | const unsigned long bit = (start_gpa - vmem->addr) / vmem->block_size; | |
422 | const unsigned long nbits = size / vmem->block_size; | |
423 | ||
424 | if (plugged) { | |
425 | bitmap_set(vmem->bitmap, bit, nbits); | |
426 | } else { | |
427 | bitmap_clear(vmem->bitmap, bit, nbits); | |
428 | } | |
429 | } | |
430 | ||
431 | static void virtio_mem_send_response(VirtIOMEM *vmem, VirtQueueElement *elem, | |
432 | struct virtio_mem_resp *resp) | |
433 | { | |
434 | VirtIODevice *vdev = VIRTIO_DEVICE(vmem); | |
435 | VirtQueue *vq = vmem->vq; | |
436 | ||
43e54950 | 437 | trace_virtio_mem_send_response(le16_to_cpu(resp->type)); |
910b2576 DH |
438 | iov_from_buf(elem->in_sg, elem->in_num, 0, resp, sizeof(*resp)); |
439 | ||
440 | virtqueue_push(vq, elem, sizeof(*resp)); | |
441 | virtio_notify(vdev, vq); | |
442 | } | |
443 | ||
444 | static void virtio_mem_send_response_simple(VirtIOMEM *vmem, | |
445 | VirtQueueElement *elem, | |
446 | uint16_t type) | |
447 | { | |
448 | struct virtio_mem_resp resp = { | |
449 | .type = cpu_to_le16(type), | |
450 | }; | |
451 | ||
452 | virtio_mem_send_response(vmem, elem, &resp); | |
453 | } | |
454 | ||
2044969f DH |
455 | static bool virtio_mem_valid_range(const VirtIOMEM *vmem, uint64_t gpa, |
456 | uint64_t size) | |
910b2576 DH |
457 | { |
458 | if (!QEMU_IS_ALIGNED(gpa, vmem->block_size)) { | |
459 | return false; | |
460 | } | |
461 | if (gpa + size < gpa || !size) { | |
462 | return false; | |
463 | } | |
464 | if (gpa < vmem->addr || gpa >= vmem->addr + vmem->usable_region_size) { | |
465 | return false; | |
466 | } | |
467 | if (gpa + size > vmem->addr + vmem->usable_region_size) { | |
468 | return false; | |
469 | } | |
470 | return true; | |
471 | } | |
472 | ||
473 | static int virtio_mem_set_block_state(VirtIOMEM *vmem, uint64_t start_gpa, | |
474 | uint64_t size, bool plug) | |
475 | { | |
476 | const uint64_t offset = start_gpa - vmem->addr; | |
3aca6380 | 477 | RAMBlock *rb = vmem->memdev->mr.ram_block; |
910b2576 DH |
478 | |
479 | if (virtio_mem_is_busy()) { | |
480 | return -EBUSY; | |
481 | } | |
482 | ||
483 | if (!plug) { | |
3aca6380 | 484 | if (ram_block_discard_range(rb, offset, size)) { |
910b2576 DH |
485 | return -EBUSY; |
486 | } | |
2044969f | 487 | virtio_mem_notify_unplug(vmem, offset, size); |
09b3b7e0 DH |
488 | } else { |
489 | int ret = 0; | |
490 | ||
491 | if (vmem->prealloc) { | |
492 | void *area = memory_region_get_ram_ptr(&vmem->memdev->mr) + offset; | |
493 | int fd = memory_region_get_fd(&vmem->memdev->mr); | |
494 | Error *local_err = NULL; | |
495 | ||
e04a34e5 | 496 | qemu_prealloc_mem(fd, area, size, 1, NULL, &local_err); |
09b3b7e0 DH |
497 | if (local_err) { |
498 | static bool warned; | |
499 | ||
500 | /* | |
501 | * Warn only once, we don't want to fill the log with these | |
502 | * warnings. | |
503 | */ | |
504 | if (!warned) { | |
505 | warn_report_err(local_err); | |
506 | warned = true; | |
507 | } else { | |
508 | error_free(local_err); | |
509 | } | |
510 | ret = -EBUSY; | |
511 | } | |
512 | } | |
513 | if (!ret) { | |
514 | ret = virtio_mem_notify_plug(vmem, offset, size); | |
515 | } | |
516 | ||
517 | if (ret) { | |
518 | /* Could be preallocation or a notifier populated memory. */ | |
519 | ram_block_discard_range(vmem->memdev->mr.ram_block, offset, size); | |
520 | return -EBUSY; | |
521 | } | |
910b2576 DH |
522 | } |
523 | virtio_mem_set_bitmap(vmem, start_gpa, size, plug); | |
524 | return 0; | |
525 | } | |
526 | ||
527 | static int virtio_mem_state_change_request(VirtIOMEM *vmem, uint64_t gpa, | |
528 | uint16_t nb_blocks, bool plug) | |
529 | { | |
530 | const uint64_t size = nb_blocks * vmem->block_size; | |
531 | int ret; | |
532 | ||
533 | if (!virtio_mem_valid_range(vmem, gpa, size)) { | |
534 | return VIRTIO_MEM_RESP_ERROR; | |
535 | } | |
536 | ||
537 | if (plug && (vmem->size + size > vmem->requested_size)) { | |
538 | return VIRTIO_MEM_RESP_NACK; | |
539 | } | |
540 | ||
541 | /* test if really all blocks are in the opposite state */ | |
542 | if (!virtio_mem_test_bitmap(vmem, gpa, size, !plug)) { | |
543 | return VIRTIO_MEM_RESP_ERROR; | |
544 | } | |
545 | ||
546 | ret = virtio_mem_set_block_state(vmem, gpa, size, plug); | |
547 | if (ret) { | |
548 | return VIRTIO_MEM_RESP_BUSY; | |
549 | } | |
550 | if (plug) { | |
551 | vmem->size += size; | |
552 | } else { | |
553 | vmem->size -= size; | |
554 | } | |
c95b4437 | 555 | notifier_list_notify(&vmem->size_change_notifiers, &vmem->size); |
910b2576 DH |
556 | return VIRTIO_MEM_RESP_ACK; |
557 | } | |
558 | ||
559 | static void virtio_mem_plug_request(VirtIOMEM *vmem, VirtQueueElement *elem, | |
560 | struct virtio_mem_req *req) | |
561 | { | |
562 | const uint64_t gpa = le64_to_cpu(req->u.plug.addr); | |
563 | const uint16_t nb_blocks = le16_to_cpu(req->u.plug.nb_blocks); | |
564 | uint16_t type; | |
565 | ||
43e54950 | 566 | trace_virtio_mem_plug_request(gpa, nb_blocks); |
910b2576 DH |
567 | type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, true); |
568 | virtio_mem_send_response_simple(vmem, elem, type); | |
569 | } | |
570 | ||
571 | static void virtio_mem_unplug_request(VirtIOMEM *vmem, VirtQueueElement *elem, | |
572 | struct virtio_mem_req *req) | |
573 | { | |
574 | const uint64_t gpa = le64_to_cpu(req->u.unplug.addr); | |
575 | const uint16_t nb_blocks = le16_to_cpu(req->u.unplug.nb_blocks); | |
576 | uint16_t type; | |
577 | ||
43e54950 | 578 | trace_virtio_mem_unplug_request(gpa, nb_blocks); |
910b2576 DH |
579 | type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, false); |
580 | virtio_mem_send_response_simple(vmem, elem, type); | |
581 | } | |
582 | ||
583 | static void virtio_mem_resize_usable_region(VirtIOMEM *vmem, | |
584 | uint64_t requested_size, | |
585 | bool can_shrink) | |
586 | { | |
587 | uint64_t newsize = MIN(memory_region_size(&vmem->memdev->mr), | |
588 | requested_size + VIRTIO_MEM_USABLE_EXTENT); | |
589 | ||
0aed2800 DH |
590 | /* The usable region size always has to be multiples of the block size. */ |
591 | newsize = QEMU_ALIGN_UP(newsize, vmem->block_size); | |
592 | ||
910b2576 DH |
593 | if (!requested_size) { |
594 | newsize = 0; | |
595 | } | |
596 | ||
597 | if (newsize < vmem->usable_region_size && !can_shrink) { | |
598 | return; | |
599 | } | |
600 | ||
43e54950 | 601 | trace_virtio_mem_resized_usable_region(vmem->usable_region_size, newsize); |
910b2576 DH |
602 | vmem->usable_region_size = newsize; |
603 | } | |
604 | ||
605 | static int virtio_mem_unplug_all(VirtIOMEM *vmem) | |
606 | { | |
607 | RAMBlock *rb = vmem->memdev->mr.ram_block; | |
910b2576 DH |
608 | |
609 | if (virtio_mem_is_busy()) { | |
610 | return -EBUSY; | |
611 | } | |
612 | ||
3aca6380 | 613 | if (ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb))) { |
910b2576 DH |
614 | return -EBUSY; |
615 | } | |
2044969f DH |
616 | virtio_mem_notify_unplug_all(vmem); |
617 | ||
910b2576 | 618 | bitmap_clear(vmem->bitmap, 0, vmem->bitmap_size); |
c95b4437 DH |
619 | if (vmem->size) { |
620 | vmem->size = 0; | |
621 | notifier_list_notify(&vmem->size_change_notifiers, &vmem->size); | |
622 | } | |
43e54950 | 623 | trace_virtio_mem_unplugged_all(); |
910b2576 DH |
624 | virtio_mem_resize_usable_region(vmem, vmem->requested_size, true); |
625 | return 0; | |
626 | } | |
627 | ||
628 | static void virtio_mem_unplug_all_request(VirtIOMEM *vmem, | |
629 | VirtQueueElement *elem) | |
630 | { | |
43e54950 | 631 | trace_virtio_mem_unplug_all_request(); |
910b2576 DH |
632 | if (virtio_mem_unplug_all(vmem)) { |
633 | virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_BUSY); | |
634 | } else { | |
635 | virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ACK); | |
636 | } | |
637 | } | |
638 | ||
639 | static void virtio_mem_state_request(VirtIOMEM *vmem, VirtQueueElement *elem, | |
640 | struct virtio_mem_req *req) | |
641 | { | |
642 | const uint16_t nb_blocks = le16_to_cpu(req->u.state.nb_blocks); | |
643 | const uint64_t gpa = le64_to_cpu(req->u.state.addr); | |
644 | const uint64_t size = nb_blocks * vmem->block_size; | |
645 | struct virtio_mem_resp resp = { | |
646 | .type = cpu_to_le16(VIRTIO_MEM_RESP_ACK), | |
647 | }; | |
648 | ||
43e54950 | 649 | trace_virtio_mem_state_request(gpa, nb_blocks); |
910b2576 DH |
650 | if (!virtio_mem_valid_range(vmem, gpa, size)) { |
651 | virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ERROR); | |
652 | return; | |
653 | } | |
654 | ||
655 | if (virtio_mem_test_bitmap(vmem, gpa, size, true)) { | |
656 | resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_PLUGGED); | |
657 | } else if (virtio_mem_test_bitmap(vmem, gpa, size, false)) { | |
658 | resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_UNPLUGGED); | |
659 | } else { | |
660 | resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_MIXED); | |
661 | } | |
43e54950 | 662 | trace_virtio_mem_state_response(le16_to_cpu(resp.u.state.state)); |
910b2576 DH |
663 | virtio_mem_send_response(vmem, elem, &resp); |
664 | } | |
665 | ||
666 | static void virtio_mem_handle_request(VirtIODevice *vdev, VirtQueue *vq) | |
667 | { | |
668 | const int len = sizeof(struct virtio_mem_req); | |
669 | VirtIOMEM *vmem = VIRTIO_MEM(vdev); | |
670 | VirtQueueElement *elem; | |
671 | struct virtio_mem_req req; | |
672 | uint16_t type; | |
673 | ||
674 | while (true) { | |
675 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); | |
676 | if (!elem) { | |
677 | return; | |
678 | } | |
679 | ||
680 | if (iov_to_buf(elem->out_sg, elem->out_num, 0, &req, len) < len) { | |
681 | virtio_error(vdev, "virtio-mem protocol violation: invalid request" | |
682 | " size: %d", len); | |
0c404e45 | 683 | virtqueue_detach_element(vq, elem, 0); |
910b2576 DH |
684 | g_free(elem); |
685 | return; | |
686 | } | |
687 | ||
688 | if (iov_size(elem->in_sg, elem->in_num) < | |
689 | sizeof(struct virtio_mem_resp)) { | |
690 | virtio_error(vdev, "virtio-mem protocol violation: not enough space" | |
691 | " for response: %zu", | |
692 | iov_size(elem->in_sg, elem->in_num)); | |
0c404e45 | 693 | virtqueue_detach_element(vq, elem, 0); |
910b2576 DH |
694 | g_free(elem); |
695 | return; | |
696 | } | |
697 | ||
698 | type = le16_to_cpu(req.type); | |
699 | switch (type) { | |
700 | case VIRTIO_MEM_REQ_PLUG: | |
701 | virtio_mem_plug_request(vmem, elem, &req); | |
702 | break; | |
703 | case VIRTIO_MEM_REQ_UNPLUG: | |
704 | virtio_mem_unplug_request(vmem, elem, &req); | |
705 | break; | |
706 | case VIRTIO_MEM_REQ_UNPLUG_ALL: | |
707 | virtio_mem_unplug_all_request(vmem, elem); | |
708 | break; | |
709 | case VIRTIO_MEM_REQ_STATE: | |
710 | virtio_mem_state_request(vmem, elem, &req); | |
711 | break; | |
712 | default: | |
713 | virtio_error(vdev, "virtio-mem protocol violation: unknown request" | |
714 | " type: %d", type); | |
0c404e45 | 715 | virtqueue_detach_element(vq, elem, 0); |
910b2576 DH |
716 | g_free(elem); |
717 | return; | |
718 | } | |
719 | ||
720 | g_free(elem); | |
721 | } | |
722 | } | |
723 | ||
724 | static void virtio_mem_get_config(VirtIODevice *vdev, uint8_t *config_data) | |
725 | { | |
726 | VirtIOMEM *vmem = VIRTIO_MEM(vdev); | |
727 | struct virtio_mem_config *config = (void *) config_data; | |
728 | ||
729 | config->block_size = cpu_to_le64(vmem->block_size); | |
730 | config->node_id = cpu_to_le16(vmem->node); | |
731 | config->requested_size = cpu_to_le64(vmem->requested_size); | |
732 | config->plugged_size = cpu_to_le64(vmem->size); | |
733 | config->addr = cpu_to_le64(vmem->addr); | |
734 | config->region_size = cpu_to_le64(memory_region_size(&vmem->memdev->mr)); | |
735 | config->usable_region_size = cpu_to_le64(vmem->usable_region_size); | |
736 | } | |
737 | ||
738 | static uint64_t virtio_mem_get_features(VirtIODevice *vdev, uint64_t features, | |
739 | Error **errp) | |
740 | { | |
741 | MachineState *ms = MACHINE(qdev_get_machine()); | |
23ad8dec | 742 | VirtIOMEM *vmem = VIRTIO_MEM(vdev); |
910b2576 DH |
743 | |
744 | if (ms->numa_state) { | |
745 | #if defined(CONFIG_ACPI) | |
746 | virtio_add_feature(&features, VIRTIO_MEM_F_ACPI_PXM); | |
747 | #endif | |
748 | } | |
23ad8dec DH |
749 | assert(vmem->unplugged_inaccessible != ON_OFF_AUTO_AUTO); |
750 | if (vmem->unplugged_inaccessible == ON_OFF_AUTO_ON) { | |
751 | virtio_add_feature(&features, VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE); | |
752 | } | |
910b2576 DH |
753 | return features; |
754 | } | |
755 | ||
23ad8dec DH |
756 | static int virtio_mem_validate_features(VirtIODevice *vdev) |
757 | { | |
758 | if (virtio_host_has_feature(vdev, VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE) && | |
759 | !virtio_vdev_has_feature(vdev, VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE)) { | |
760 | return -EFAULT; | |
761 | } | |
762 | return 0; | |
763 | } | |
764 | ||
910b2576 DH |
765 | static void virtio_mem_system_reset(void *opaque) |
766 | { | |
767 | VirtIOMEM *vmem = VIRTIO_MEM(opaque); | |
768 | ||
769 | /* | |
770 | * During usual resets, we will unplug all memory and shrink the usable | |
771 | * region size. This is, however, not possible in all scenarios. Then, | |
772 | * the guest has to deal with this manually (VIRTIO_MEM_REQ_UNPLUG_ALL). | |
773 | */ | |
774 | virtio_mem_unplug_all(vmem); | |
775 | } | |
776 | ||
777 | static void virtio_mem_device_realize(DeviceState *dev, Error **errp) | |
778 | { | |
779 | MachineState *ms = MACHINE(qdev_get_machine()); | |
780 | int nb_numa_nodes = ms->numa_state ? ms->numa_state->num_nodes : 0; | |
781 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
782 | VirtIOMEM *vmem = VIRTIO_MEM(dev); | |
783 | uint64_t page_size; | |
784 | RAMBlock *rb; | |
785 | int ret; | |
786 | ||
787 | if (!vmem->memdev) { | |
788 | error_setg(errp, "'%s' property is not set", VIRTIO_MEM_MEMDEV_PROP); | |
789 | return; | |
790 | } else if (host_memory_backend_is_mapped(vmem->memdev)) { | |
910b2576 | 791 | error_setg(errp, "'%s' property specifies a busy memdev: %s", |
7a309cc9 MA |
792 | VIRTIO_MEM_MEMDEV_PROP, |
793 | object_get_canonical_path_component(OBJECT(vmem->memdev))); | |
910b2576 DH |
794 | return; |
795 | } else if (!memory_region_is_ram(&vmem->memdev->mr) || | |
796 | memory_region_is_rom(&vmem->memdev->mr) || | |
797 | !vmem->memdev->mr.ram_block) { | |
798 | error_setg(errp, "'%s' property specifies an unsupported memdev", | |
799 | VIRTIO_MEM_MEMDEV_PROP); | |
800 | return; | |
ce1761f0 DH |
801 | } else if (vmem->memdev->prealloc) { |
802 | error_setg(errp, "'%s' property specifies a memdev with preallocation" | |
803 | " enabled: %s. Instead, specify 'prealloc=on' for the" | |
804 | " virtio-mem device. ", VIRTIO_MEM_MEMDEV_PROP, | |
805 | object_get_canonical_path_component(OBJECT(vmem->memdev))); | |
806 | return; | |
910b2576 DH |
807 | } |
808 | ||
809 | if ((nb_numa_nodes && vmem->node >= nb_numa_nodes) || | |
810 | (!nb_numa_nodes && vmem->node)) { | |
811 | error_setg(errp, "'%s' property has value '%" PRIu32 "', which exceeds" | |
812 | "the number of numa nodes: %d", VIRTIO_MEM_NODE_PROP, | |
813 | vmem->node, nb_numa_nodes ? nb_numa_nodes : 1); | |
814 | return; | |
815 | } | |
816 | ||
817 | if (enable_mlock) { | |
818 | error_setg(errp, "Incompatible with mlock"); | |
819 | return; | |
820 | } | |
821 | ||
822 | rb = vmem->memdev->mr.ram_block; | |
823 | page_size = qemu_ram_pagesize(rb); | |
824 | ||
23ad8dec DH |
825 | #if defined(VIRTIO_MEM_HAS_LEGACY_GUESTS) |
826 | switch (vmem->unplugged_inaccessible) { | |
827 | case ON_OFF_AUTO_AUTO: | |
828 | if (virtio_mem_has_shared_zeropage(rb)) { | |
829 | vmem->unplugged_inaccessible = ON_OFF_AUTO_OFF; | |
830 | } else { | |
831 | vmem->unplugged_inaccessible = ON_OFF_AUTO_ON; | |
832 | } | |
833 | break; | |
834 | case ON_OFF_AUTO_OFF: | |
835 | if (!virtio_mem_has_shared_zeropage(rb)) { | |
836 | warn_report("'%s' property set to 'off' with a memdev that does" | |
837 | " not support the shared zeropage.", | |
838 | VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP); | |
839 | } | |
840 | break; | |
841 | default: | |
842 | break; | |
843 | } | |
844 | #else /* VIRTIO_MEM_HAS_LEGACY_GUESTS */ | |
845 | vmem->unplugged_inaccessible = ON_OFF_AUTO_ON; | |
846 | #endif /* VIRTIO_MEM_HAS_LEGACY_GUESTS */ | |
847 | ||
228957fe DH |
848 | /* |
849 | * If the block size wasn't configured by the user, use a sane default. This | |
850 | * allows using hugetlbfs backends of any page size without manual | |
851 | * intervention. | |
852 | */ | |
853 | if (!vmem->block_size) { | |
854 | vmem->block_size = virtio_mem_default_block_size(rb); | |
855 | } | |
856 | ||
910b2576 DH |
857 | if (vmem->block_size < page_size) { |
858 | error_setg(errp, "'%s' property has to be at least the page size (0x%" | |
859 | PRIx64 ")", VIRTIO_MEM_BLOCK_SIZE_PROP, page_size); | |
860 | return; | |
228957fe DH |
861 | } else if (vmem->block_size < virtio_mem_default_block_size(rb)) { |
862 | warn_report("'%s' property is smaller than the default block size (%" | |
863 | PRIx64 " MiB)", VIRTIO_MEM_BLOCK_SIZE_PROP, | |
864 | virtio_mem_default_block_size(rb) / MiB); | |
7656d9ce DH |
865 | } |
866 | if (!QEMU_IS_ALIGNED(vmem->requested_size, vmem->block_size)) { | |
910b2576 DH |
867 | error_setg(errp, "'%s' property has to be multiples of '%s' (0x%" PRIx64 |
868 | ")", VIRTIO_MEM_REQUESTED_SIZE_PROP, | |
869 | VIRTIO_MEM_BLOCK_SIZE_PROP, vmem->block_size); | |
870 | return; | |
d31992ae DH |
871 | } else if (!QEMU_IS_ALIGNED(vmem->addr, vmem->block_size)) { |
872 | error_setg(errp, "'%s' property has to be multiples of '%s' (0x%" PRIx64 | |
873 | ")", VIRTIO_MEM_ADDR_PROP, VIRTIO_MEM_BLOCK_SIZE_PROP, | |
874 | vmem->block_size); | |
875 | return; | |
910b2576 DH |
876 | } else if (!QEMU_IS_ALIGNED(memory_region_size(&vmem->memdev->mr), |
877 | vmem->block_size)) { | |
878 | error_setg(errp, "'%s' property memdev size has to be multiples of" | |
879 | "'%s' (0x%" PRIx64 ")", VIRTIO_MEM_MEMDEV_PROP, | |
880 | VIRTIO_MEM_BLOCK_SIZE_PROP, vmem->block_size); | |
881 | return; | |
882 | } | |
883 | ||
bc072ed4 | 884 | if (ram_block_coordinated_discard_require(true)) { |
910b2576 DH |
885 | error_setg(errp, "Discarding RAM is disabled"); |
886 | return; | |
887 | } | |
888 | ||
889 | ret = ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb)); | |
890 | if (ret) { | |
891 | error_setg_errno(errp, -ret, "Unexpected error discarding RAM"); | |
bc072ed4 | 892 | ram_block_coordinated_discard_require(false); |
910b2576 DH |
893 | return; |
894 | } | |
895 | ||
896 | virtio_mem_resize_usable_region(vmem, vmem->requested_size, true); | |
897 | ||
898 | vmem->bitmap_size = memory_region_size(&vmem->memdev->mr) / | |
899 | vmem->block_size; | |
900 | vmem->bitmap = bitmap_new(vmem->bitmap_size); | |
901 | ||
3857cd5c | 902 | virtio_init(vdev, VIRTIO_ID_MEM, sizeof(struct virtio_mem_config)); |
910b2576 DH |
903 | vmem->vq = virtio_add_queue(vdev, 128, virtio_mem_handle_request); |
904 | ||
905 | host_memory_backend_set_mapped(vmem->memdev, true); | |
906 | vmstate_register_ram(&vmem->memdev->mr, DEVICE(vmem)); | |
3b95a71b DH |
907 | if (vmem->early_migration) { |
908 | vmstate_register(VMSTATE_IF(vmem), VMSTATE_INSTANCE_ID_ANY, | |
909 | &vmstate_virtio_mem_device_early, vmem); | |
910 | } | |
910b2576 | 911 | qemu_register_reset(virtio_mem_system_reset, vmem); |
2044969f DH |
912 | |
913 | /* | |
914 | * Set ourselves as RamDiscardManager before the plug handler maps the | |
915 | * memory region and exposes it via an address space. | |
916 | */ | |
917 | memory_region_set_ram_discard_manager(&vmem->memdev->mr, | |
918 | RAM_DISCARD_MANAGER(vmem)); | |
910b2576 DH |
919 | } |
920 | ||
921 | static void virtio_mem_device_unrealize(DeviceState *dev) | |
922 | { | |
923 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
924 | VirtIOMEM *vmem = VIRTIO_MEM(dev); | |
925 | ||
2044969f DH |
926 | /* |
927 | * The unplug handler unmapped the memory region, it cannot be | |
928 | * found via an address space anymore. Unset ourselves. | |
929 | */ | |
930 | memory_region_set_ram_discard_manager(&vmem->memdev->mr, NULL); | |
910b2576 | 931 | qemu_unregister_reset(virtio_mem_system_reset, vmem); |
3b95a71b DH |
932 | if (vmem->early_migration) { |
933 | vmstate_unregister(VMSTATE_IF(vmem), &vmstate_virtio_mem_device_early, | |
934 | vmem); | |
935 | } | |
910b2576 DH |
936 | vmstate_unregister_ram(&vmem->memdev->mr, DEVICE(vmem)); |
937 | host_memory_backend_set_mapped(vmem->memdev, false); | |
938 | virtio_del_queue(vdev, 0); | |
939 | virtio_cleanup(vdev); | |
940 | g_free(vmem->bitmap); | |
bc072ed4 | 941 | ram_block_coordinated_discard_require(false); |
910b2576 DH |
942 | } |
943 | ||
7a9d5d02 DH |
944 | static int virtio_mem_discard_range_cb(const VirtIOMEM *vmem, void *arg, |
945 | uint64_t offset, uint64_t size) | |
910b2576 DH |
946 | { |
947 | RAMBlock *rb = vmem->memdev->mr.ram_block; | |
910b2576 | 948 | |
3aca6380 | 949 | return ram_block_discard_range(rb, offset, size) ? -EINVAL : 0; |
910b2576 DH |
950 | } |
951 | ||
7a9d5d02 DH |
952 | static int virtio_mem_restore_unplugged(VirtIOMEM *vmem) |
953 | { | |
954 | /* Make sure all memory is really discarded after migration. */ | |
955 | return virtio_mem_for_each_unplugged_range(vmem, NULL, | |
956 | virtio_mem_discard_range_cb); | |
957 | } | |
958 | ||
910b2576 DH |
959 | static int virtio_mem_post_load(void *opaque, int version_id) |
960 | { | |
2044969f DH |
961 | VirtIOMEM *vmem = VIRTIO_MEM(opaque); |
962 | RamDiscardListener *rdl; | |
963 | int ret; | |
964 | ||
d71920d4 DH |
965 | if (vmem->prealloc && !vmem->early_migration) { |
966 | warn_report("Proper preallocation with migration requires a newer QEMU machine"); | |
967 | } | |
968 | ||
2044969f DH |
969 | /* |
970 | * We started out with all memory discarded and our memory region is mapped | |
971 | * into an address space. Replay, now that we updated the bitmap. | |
972 | */ | |
973 | QLIST_FOREACH(rdl, &vmem->rdl_list, next) { | |
974 | ret = virtio_mem_for_each_plugged_section(vmem, rdl->section, rdl, | |
975 | virtio_mem_notify_populate_cb); | |
976 | if (ret) { | |
977 | return ret; | |
978 | } | |
979 | } | |
980 | ||
910b2576 DH |
981 | if (migration_in_incoming_postcopy()) { |
982 | return 0; | |
983 | } | |
984 | ||
2044969f | 985 | return virtio_mem_restore_unplugged(vmem); |
910b2576 DH |
986 | } |
987 | ||
d71920d4 DH |
988 | static int virtio_mem_prealloc_range_cb(const VirtIOMEM *vmem, void *arg, |
989 | uint64_t offset, uint64_t size) | |
990 | { | |
991 | void *area = memory_region_get_ram_ptr(&vmem->memdev->mr) + offset; | |
992 | int fd = memory_region_get_fd(&vmem->memdev->mr); | |
993 | Error *local_err = NULL; | |
994 | ||
995 | qemu_prealloc_mem(fd, area, size, 1, NULL, &local_err); | |
996 | if (local_err) { | |
997 | error_report_err(local_err); | |
998 | return -ENOMEM; | |
999 | } | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static int virtio_mem_post_load_early(void *opaque, int version_id) | |
1004 | { | |
1005 | VirtIOMEM *vmem = VIRTIO_MEM(opaque); | |
1006 | RAMBlock *rb = vmem->memdev->mr.ram_block; | |
1007 | int ret; | |
1008 | ||
1009 | if (!vmem->prealloc) { | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * We restored the bitmap and verified that the basic properties | |
1015 | * match on source and destination, so we can go ahead and preallocate | |
1016 | * memory for all plugged memory blocks, before actual RAM migration starts | |
1017 | * touching this memory. | |
1018 | */ | |
1019 | ret = virtio_mem_for_each_plugged_range(vmem, NULL, | |
1020 | virtio_mem_prealloc_range_cb); | |
1021 | if (ret) { | |
1022 | return ret; | |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * This is tricky: postcopy wants to start with a clean slate. On | |
1027 | * POSTCOPY_INCOMING_ADVISE, postcopy code discards all (ordinarily | |
1028 | * preallocated) RAM such that postcopy will work as expected later. | |
1029 | * | |
1030 | * However, we run after POSTCOPY_INCOMING_ADVISE -- but before actual | |
1031 | * RAM migration. So let's discard all memory again. This looks like an | |
1032 | * expensive NOP, but actually serves a purpose: we made sure that we | |
1033 | * were able to allocate all required backend memory once. We cannot | |
1034 | * guarantee that the backend memory we will free will remain free | |
1035 | * until we need it during postcopy, but at least we can catch the | |
1036 | * obvious setup issues this way. | |
1037 | */ | |
1038 | if (migration_incoming_postcopy_advised()) { | |
1039 | if (ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb))) { | |
1040 | return -EBUSY; | |
1041 | } | |
1042 | } | |
1043 | return 0; | |
1044 | } | |
1045 | ||
383ee445 DH |
1046 | typedef struct VirtIOMEMMigSanityChecks { |
1047 | VirtIOMEM *parent; | |
1048 | uint64_t addr; | |
1049 | uint64_t region_size; | |
1050 | uint64_t block_size; | |
1051 | uint32_t node; | |
1052 | } VirtIOMEMMigSanityChecks; | |
1053 | ||
1054 | static int virtio_mem_mig_sanity_checks_pre_save(void *opaque) | |
1055 | { | |
1056 | VirtIOMEMMigSanityChecks *tmp = opaque; | |
1057 | VirtIOMEM *vmem = tmp->parent; | |
1058 | ||
1059 | tmp->addr = vmem->addr; | |
1060 | tmp->region_size = memory_region_size(&vmem->memdev->mr); | |
1061 | tmp->block_size = vmem->block_size; | |
1062 | tmp->node = vmem->node; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static int virtio_mem_mig_sanity_checks_post_load(void *opaque, int version_id) | |
1067 | { | |
1068 | VirtIOMEMMigSanityChecks *tmp = opaque; | |
1069 | VirtIOMEM *vmem = tmp->parent; | |
1070 | const uint64_t new_region_size = memory_region_size(&vmem->memdev->mr); | |
1071 | ||
1072 | if (tmp->addr != vmem->addr) { | |
1073 | error_report("Property '%s' changed from 0x%" PRIx64 " to 0x%" PRIx64, | |
1074 | VIRTIO_MEM_ADDR_PROP, tmp->addr, vmem->addr); | |
1075 | return -EINVAL; | |
1076 | } | |
1077 | /* | |
1078 | * Note: Preparation for resizeable memory regions. The maximum size | |
1079 | * of the memory region must not change during migration. | |
1080 | */ | |
1081 | if (tmp->region_size != new_region_size) { | |
1082 | error_report("Property '%s' size changed from 0x%" PRIx64 " to 0x%" | |
1083 | PRIx64, VIRTIO_MEM_MEMDEV_PROP, tmp->region_size, | |
1084 | new_region_size); | |
1085 | return -EINVAL; | |
1086 | } | |
1087 | if (tmp->block_size != vmem->block_size) { | |
1088 | error_report("Property '%s' changed from 0x%" PRIx64 " to 0x%" PRIx64, | |
1089 | VIRTIO_MEM_BLOCK_SIZE_PROP, tmp->block_size, | |
1090 | vmem->block_size); | |
1091 | return -EINVAL; | |
1092 | } | |
1093 | if (tmp->node != vmem->node) { | |
1094 | error_report("Property '%s' changed from %" PRIu32 " to %" PRIu32, | |
1095 | VIRTIO_MEM_NODE_PROP, tmp->node, vmem->node); | |
1096 | return -EINVAL; | |
1097 | } | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static const VMStateDescription vmstate_virtio_mem_sanity_checks = { | |
1102 | .name = "virtio-mem-device/sanity-checks", | |
1103 | .pre_save = virtio_mem_mig_sanity_checks_pre_save, | |
1104 | .post_load = virtio_mem_mig_sanity_checks_post_load, | |
1105 | .fields = (VMStateField[]) { | |
1106 | VMSTATE_UINT64(addr, VirtIOMEMMigSanityChecks), | |
1107 | VMSTATE_UINT64(region_size, VirtIOMEMMigSanityChecks), | |
1108 | VMSTATE_UINT64(block_size, VirtIOMEMMigSanityChecks), | |
1109 | VMSTATE_UINT32(node, VirtIOMEMMigSanityChecks), | |
1110 | VMSTATE_END_OF_LIST(), | |
1111 | }, | |
1112 | }; | |
1113 | ||
3b95a71b DH |
1114 | static bool virtio_mem_vmstate_field_exists(void *opaque, int version_id) |
1115 | { | |
1116 | const VirtIOMEM *vmem = VIRTIO_MEM(opaque); | |
1117 | ||
1118 | /* With early migration, these fields were already migrated. */ | |
1119 | return !vmem->early_migration; | |
1120 | } | |
1121 | ||
910b2576 DH |
1122 | static const VMStateDescription vmstate_virtio_mem_device = { |
1123 | .name = "virtio-mem-device", | |
1124 | .minimum_version_id = 1, | |
1125 | .version_id = 1, | |
0fd7616e | 1126 | .priority = MIG_PRI_VIRTIO_MEM, |
910b2576 | 1127 | .post_load = virtio_mem_post_load, |
3b95a71b DH |
1128 | .fields = (VMStateField[]) { |
1129 | VMSTATE_WITH_TMP_TEST(VirtIOMEM, virtio_mem_vmstate_field_exists, | |
1130 | VirtIOMEMMigSanityChecks, | |
1131 | vmstate_virtio_mem_sanity_checks), | |
1132 | VMSTATE_UINT64(usable_region_size, VirtIOMEM), | |
1133 | VMSTATE_UINT64_TEST(size, VirtIOMEM, virtio_mem_vmstate_field_exists), | |
1134 | VMSTATE_UINT64(requested_size, VirtIOMEM), | |
1135 | VMSTATE_BITMAP_TEST(bitmap, VirtIOMEM, virtio_mem_vmstate_field_exists, | |
1136 | 0, bitmap_size), | |
1137 | VMSTATE_END_OF_LIST() | |
1138 | }, | |
1139 | }; | |
1140 | ||
1141 | /* | |
1142 | * Transfer properties that are immutable while migration is active early, | |
1143 | * such that we have have this information around before migrating any RAM | |
1144 | * content. | |
1145 | * | |
1146 | * Note that virtio_mem_is_busy() makes sure these properties can no longer | |
1147 | * change on the migration source until migration completed. | |
1148 | * | |
1149 | * With QEMU compat machines, we transmit these properties later, via | |
1150 | * vmstate_virtio_mem_device instead -- see virtio_mem_vmstate_field_exists(). | |
1151 | */ | |
1152 | static const VMStateDescription vmstate_virtio_mem_device_early = { | |
1153 | .name = "virtio-mem-device-early", | |
1154 | .minimum_version_id = 1, | |
1155 | .version_id = 1, | |
1156 | .early_setup = true, | |
d71920d4 | 1157 | .post_load = virtio_mem_post_load_early, |
910b2576 | 1158 | .fields = (VMStateField[]) { |
383ee445 DH |
1159 | VMSTATE_WITH_TMP(VirtIOMEM, VirtIOMEMMigSanityChecks, |
1160 | vmstate_virtio_mem_sanity_checks), | |
910b2576 | 1161 | VMSTATE_UINT64(size, VirtIOMEM), |
910b2576 DH |
1162 | VMSTATE_BITMAP(bitmap, VirtIOMEM, 0, bitmap_size), |
1163 | VMSTATE_END_OF_LIST() | |
1164 | }, | |
1165 | }; | |
1166 | ||
1167 | static const VMStateDescription vmstate_virtio_mem = { | |
1168 | .name = "virtio-mem", | |
1169 | .minimum_version_id = 1, | |
1170 | .version_id = 1, | |
1171 | .fields = (VMStateField[]) { | |
1172 | VMSTATE_VIRTIO_DEVICE, | |
1173 | VMSTATE_END_OF_LIST() | |
1174 | }, | |
1175 | }; | |
1176 | ||
1177 | static void virtio_mem_fill_device_info(const VirtIOMEM *vmem, | |
1178 | VirtioMEMDeviceInfo *vi) | |
1179 | { | |
1180 | vi->memaddr = vmem->addr; | |
1181 | vi->node = vmem->node; | |
1182 | vi->requested_size = vmem->requested_size; | |
1183 | vi->size = vmem->size; | |
1184 | vi->max_size = memory_region_size(&vmem->memdev->mr); | |
1185 | vi->block_size = vmem->block_size; | |
1186 | vi->memdev = object_get_canonical_path(OBJECT(vmem->memdev)); | |
1187 | } | |
1188 | ||
1189 | static MemoryRegion *virtio_mem_get_memory_region(VirtIOMEM *vmem, Error **errp) | |
1190 | { | |
1191 | if (!vmem->memdev) { | |
1192 | error_setg(errp, "'%s' property must be set", VIRTIO_MEM_MEMDEV_PROP); | |
1193 | return NULL; | |
1194 | } | |
1195 | ||
1196 | return &vmem->memdev->mr; | |
1197 | } | |
1198 | ||
c95b4437 DH |
1199 | static void virtio_mem_add_size_change_notifier(VirtIOMEM *vmem, |
1200 | Notifier *notifier) | |
1201 | { | |
1202 | notifier_list_add(&vmem->size_change_notifiers, notifier); | |
1203 | } | |
1204 | ||
1205 | static void virtio_mem_remove_size_change_notifier(VirtIOMEM *vmem, | |
1206 | Notifier *notifier) | |
1207 | { | |
1208 | notifier_remove(notifier); | |
1209 | } | |
1210 | ||
910b2576 DH |
1211 | static void virtio_mem_get_size(Object *obj, Visitor *v, const char *name, |
1212 | void *opaque, Error **errp) | |
1213 | { | |
1214 | const VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
1215 | uint64_t value = vmem->size; | |
1216 | ||
1217 | visit_type_size(v, name, &value, errp); | |
1218 | } | |
1219 | ||
1220 | static void virtio_mem_get_requested_size(Object *obj, Visitor *v, | |
1221 | const char *name, void *opaque, | |
1222 | Error **errp) | |
1223 | { | |
1224 | const VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
1225 | uint64_t value = vmem->requested_size; | |
1226 | ||
1227 | visit_type_size(v, name, &value, errp); | |
1228 | } | |
1229 | ||
1230 | static void virtio_mem_set_requested_size(Object *obj, Visitor *v, | |
1231 | const char *name, void *opaque, | |
1232 | Error **errp) | |
1233 | { | |
1234 | VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
910b2576 DH |
1235 | uint64_t value; |
1236 | ||
d1c81c34 | 1237 | if (!visit_type_size(v, name, &value, errp)) { |
910b2576 DH |
1238 | return; |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * The block size and memory backend are not fixed until the device was | |
1243 | * realized. realize() will verify these properties then. | |
1244 | */ | |
1245 | if (DEVICE(obj)->realized) { | |
1246 | if (!QEMU_IS_ALIGNED(value, vmem->block_size)) { | |
1247 | error_setg(errp, "'%s' has to be multiples of '%s' (0x%" PRIx64 | |
1248 | ")", name, VIRTIO_MEM_BLOCK_SIZE_PROP, | |
1249 | vmem->block_size); | |
1250 | return; | |
1251 | } else if (value > memory_region_size(&vmem->memdev->mr)) { | |
1252 | error_setg(errp, "'%s' cannot exceed the memory backend size" | |
1253 | "(0x%" PRIx64 ")", name, | |
1254 | memory_region_size(&vmem->memdev->mr)); | |
1255 | return; | |
1256 | } | |
1257 | ||
1258 | if (value != vmem->requested_size) { | |
1259 | virtio_mem_resize_usable_region(vmem, value, false); | |
1260 | vmem->requested_size = value; | |
1261 | } | |
1262 | /* | |
1263 | * Trigger a config update so the guest gets notified. We trigger | |
1264 | * even if the size didn't change (especially helpful for debugging). | |
1265 | */ | |
1266 | virtio_notify_config(VIRTIO_DEVICE(vmem)); | |
1267 | } else { | |
1268 | vmem->requested_size = value; | |
1269 | } | |
1270 | } | |
1271 | ||
1272 | static void virtio_mem_get_block_size(Object *obj, Visitor *v, const char *name, | |
1273 | void *opaque, Error **errp) | |
1274 | { | |
1275 | const VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
1276 | uint64_t value = vmem->block_size; | |
1277 | ||
228957fe DH |
1278 | /* |
1279 | * If not configured by the user (and we're not realized yet), use the | |
1280 | * default block size we would use with the current memory backend. | |
1281 | */ | |
1282 | if (!value) { | |
1283 | if (vmem->memdev && memory_region_is_ram(&vmem->memdev->mr)) { | |
1284 | value = virtio_mem_default_block_size(vmem->memdev->mr.ram_block); | |
1285 | } else { | |
1286 | value = virtio_mem_thp_size(); | |
1287 | } | |
1288 | } | |
1289 | ||
910b2576 DH |
1290 | visit_type_size(v, name, &value, errp); |
1291 | } | |
1292 | ||
1293 | static void virtio_mem_set_block_size(Object *obj, Visitor *v, const char *name, | |
1294 | void *opaque, Error **errp) | |
1295 | { | |
1296 | VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
910b2576 DH |
1297 | uint64_t value; |
1298 | ||
1299 | if (DEVICE(obj)->realized) { | |
1300 | error_setg(errp, "'%s' cannot be changed", name); | |
1301 | return; | |
1302 | } | |
1303 | ||
d1c81c34 | 1304 | if (!visit_type_size(v, name, &value, errp)) { |
910b2576 DH |
1305 | return; |
1306 | } | |
1307 | ||
1308 | if (value < VIRTIO_MEM_MIN_BLOCK_SIZE) { | |
1309 | error_setg(errp, "'%s' property has to be at least 0x%" PRIx32, name, | |
1310 | VIRTIO_MEM_MIN_BLOCK_SIZE); | |
1311 | return; | |
1312 | } else if (!is_power_of_2(value)) { | |
1313 | error_setg(errp, "'%s' property has to be a power of two", name); | |
1314 | return; | |
1315 | } | |
1316 | vmem->block_size = value; | |
1317 | } | |
1318 | ||
1319 | static void virtio_mem_instance_init(Object *obj) | |
1320 | { | |
1321 | VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
1322 | ||
c95b4437 | 1323 | notifier_list_init(&vmem->size_change_notifiers); |
2044969f | 1324 | QLIST_INIT(&vmem->rdl_list); |
910b2576 DH |
1325 | |
1326 | object_property_add(obj, VIRTIO_MEM_SIZE_PROP, "size", virtio_mem_get_size, | |
1327 | NULL, NULL, NULL); | |
1328 | object_property_add(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP, "size", | |
1329 | virtio_mem_get_requested_size, | |
1330 | virtio_mem_set_requested_size, NULL, NULL); | |
1331 | object_property_add(obj, VIRTIO_MEM_BLOCK_SIZE_PROP, "size", | |
1332 | virtio_mem_get_block_size, virtio_mem_set_block_size, | |
1333 | NULL, NULL); | |
1334 | } | |
1335 | ||
1336 | static Property virtio_mem_properties[] = { | |
1337 | DEFINE_PROP_UINT64(VIRTIO_MEM_ADDR_PROP, VirtIOMEM, addr, 0), | |
1338 | DEFINE_PROP_UINT32(VIRTIO_MEM_NODE_PROP, VirtIOMEM, node, 0), | |
09b3b7e0 | 1339 | DEFINE_PROP_BOOL(VIRTIO_MEM_PREALLOC_PROP, VirtIOMEM, prealloc, false), |
910b2576 DH |
1340 | DEFINE_PROP_LINK(VIRTIO_MEM_MEMDEV_PROP, VirtIOMEM, memdev, |
1341 | TYPE_MEMORY_BACKEND, HostMemoryBackend *), | |
23ad8dec DH |
1342 | #if defined(VIRTIO_MEM_HAS_LEGACY_GUESTS) |
1343 | DEFINE_PROP_ON_OFF_AUTO(VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP, VirtIOMEM, | |
d5cef025 | 1344 | unplugged_inaccessible, ON_OFF_AUTO_ON), |
23ad8dec | 1345 | #endif |
3b95a71b DH |
1346 | DEFINE_PROP_BOOL(VIRTIO_MEM_EARLY_MIGRATION_PROP, VirtIOMEM, |
1347 | early_migration, true), | |
910b2576 DH |
1348 | DEFINE_PROP_END_OF_LIST(), |
1349 | }; | |
1350 | ||
2044969f DH |
1351 | static uint64_t virtio_mem_rdm_get_min_granularity(const RamDiscardManager *rdm, |
1352 | const MemoryRegion *mr) | |
1353 | { | |
1354 | const VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1355 | ||
1356 | g_assert(mr == &vmem->memdev->mr); | |
1357 | return vmem->block_size; | |
1358 | } | |
1359 | ||
1360 | static bool virtio_mem_rdm_is_populated(const RamDiscardManager *rdm, | |
1361 | const MemoryRegionSection *s) | |
1362 | { | |
1363 | const VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1364 | uint64_t start_gpa = vmem->addr + s->offset_within_region; | |
1365 | uint64_t end_gpa = start_gpa + int128_get64(s->size); | |
1366 | ||
1367 | g_assert(s->mr == &vmem->memdev->mr); | |
1368 | ||
1369 | start_gpa = QEMU_ALIGN_DOWN(start_gpa, vmem->block_size); | |
1370 | end_gpa = QEMU_ALIGN_UP(end_gpa, vmem->block_size); | |
1371 | ||
1372 | if (!virtio_mem_valid_range(vmem, start_gpa, end_gpa - start_gpa)) { | |
1373 | return false; | |
1374 | } | |
1375 | ||
1376 | return virtio_mem_test_bitmap(vmem, start_gpa, end_gpa - start_gpa, true); | |
1377 | } | |
1378 | ||
1379 | struct VirtIOMEMReplayData { | |
1380 | void *fn; | |
1381 | void *opaque; | |
1382 | }; | |
1383 | ||
1384 | static int virtio_mem_rdm_replay_populated_cb(MemoryRegionSection *s, void *arg) | |
1385 | { | |
1386 | struct VirtIOMEMReplayData *data = arg; | |
1387 | ||
1388 | return ((ReplayRamPopulate)data->fn)(s, data->opaque); | |
1389 | } | |
1390 | ||
1391 | static int virtio_mem_rdm_replay_populated(const RamDiscardManager *rdm, | |
1392 | MemoryRegionSection *s, | |
1393 | ReplayRamPopulate replay_fn, | |
1394 | void *opaque) | |
1395 | { | |
1396 | const VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1397 | struct VirtIOMEMReplayData data = { | |
1398 | .fn = replay_fn, | |
1399 | .opaque = opaque, | |
1400 | }; | |
1401 | ||
1402 | g_assert(s->mr == &vmem->memdev->mr); | |
1403 | return virtio_mem_for_each_plugged_section(vmem, s, &data, | |
1404 | virtio_mem_rdm_replay_populated_cb); | |
1405 | } | |
1406 | ||
372aa6fd DH |
1407 | static int virtio_mem_rdm_replay_discarded_cb(MemoryRegionSection *s, |
1408 | void *arg) | |
1409 | { | |
1410 | struct VirtIOMEMReplayData *data = arg; | |
1411 | ||
1412 | ((ReplayRamDiscard)data->fn)(s, data->opaque); | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | static void virtio_mem_rdm_replay_discarded(const RamDiscardManager *rdm, | |
1417 | MemoryRegionSection *s, | |
1418 | ReplayRamDiscard replay_fn, | |
1419 | void *opaque) | |
1420 | { | |
1421 | const VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1422 | struct VirtIOMEMReplayData data = { | |
1423 | .fn = replay_fn, | |
1424 | .opaque = opaque, | |
1425 | }; | |
1426 | ||
1427 | g_assert(s->mr == &vmem->memdev->mr); | |
1428 | virtio_mem_for_each_unplugged_section(vmem, s, &data, | |
1429 | virtio_mem_rdm_replay_discarded_cb); | |
1430 | } | |
1431 | ||
2044969f DH |
1432 | static void virtio_mem_rdm_register_listener(RamDiscardManager *rdm, |
1433 | RamDiscardListener *rdl, | |
1434 | MemoryRegionSection *s) | |
1435 | { | |
1436 | VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1437 | int ret; | |
1438 | ||
1439 | g_assert(s->mr == &vmem->memdev->mr); | |
1440 | rdl->section = memory_region_section_new_copy(s); | |
1441 | ||
1442 | QLIST_INSERT_HEAD(&vmem->rdl_list, rdl, next); | |
1443 | ret = virtio_mem_for_each_plugged_section(vmem, rdl->section, rdl, | |
1444 | virtio_mem_notify_populate_cb); | |
1445 | if (ret) { | |
1446 | error_report("%s: Replaying plugged ranges failed: %s", __func__, | |
1447 | strerror(-ret)); | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | static void virtio_mem_rdm_unregister_listener(RamDiscardManager *rdm, | |
1452 | RamDiscardListener *rdl) | |
1453 | { | |
1454 | VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1455 | ||
1456 | g_assert(rdl->section->mr == &vmem->memdev->mr); | |
1457 | if (vmem->size) { | |
1458 | if (rdl->double_discard_supported) { | |
1459 | rdl->notify_discard(rdl, rdl->section); | |
1460 | } else { | |
1461 | virtio_mem_for_each_plugged_section(vmem, rdl->section, rdl, | |
1462 | virtio_mem_notify_discard_cb); | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | memory_region_section_free_copy(rdl->section); | |
1467 | rdl->section = NULL; | |
1468 | QLIST_REMOVE(rdl, next); | |
1469 | } | |
1470 | ||
910b2576 DH |
1471 | static void virtio_mem_class_init(ObjectClass *klass, void *data) |
1472 | { | |
1473 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1474 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
1475 | VirtIOMEMClass *vmc = VIRTIO_MEM_CLASS(klass); | |
2044969f | 1476 | RamDiscardManagerClass *rdmc = RAM_DISCARD_MANAGER_CLASS(klass); |
910b2576 DH |
1477 | |
1478 | device_class_set_props(dc, virtio_mem_properties); | |
1479 | dc->vmsd = &vmstate_virtio_mem; | |
1480 | ||
1481 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); | |
1482 | vdc->realize = virtio_mem_device_realize; | |
1483 | vdc->unrealize = virtio_mem_device_unrealize; | |
1484 | vdc->get_config = virtio_mem_get_config; | |
1485 | vdc->get_features = virtio_mem_get_features; | |
23ad8dec | 1486 | vdc->validate_features = virtio_mem_validate_features; |
910b2576 DH |
1487 | vdc->vmsd = &vmstate_virtio_mem_device; |
1488 | ||
1489 | vmc->fill_device_info = virtio_mem_fill_device_info; | |
1490 | vmc->get_memory_region = virtio_mem_get_memory_region; | |
c95b4437 DH |
1491 | vmc->add_size_change_notifier = virtio_mem_add_size_change_notifier; |
1492 | vmc->remove_size_change_notifier = virtio_mem_remove_size_change_notifier; | |
2044969f DH |
1493 | |
1494 | rdmc->get_min_granularity = virtio_mem_rdm_get_min_granularity; | |
1495 | rdmc->is_populated = virtio_mem_rdm_is_populated; | |
1496 | rdmc->replay_populated = virtio_mem_rdm_replay_populated; | |
372aa6fd | 1497 | rdmc->replay_discarded = virtio_mem_rdm_replay_discarded; |
2044969f DH |
1498 | rdmc->register_listener = virtio_mem_rdm_register_listener; |
1499 | rdmc->unregister_listener = virtio_mem_rdm_unregister_listener; | |
910b2576 DH |
1500 | } |
1501 | ||
1502 | static const TypeInfo virtio_mem_info = { | |
1503 | .name = TYPE_VIRTIO_MEM, | |
1504 | .parent = TYPE_VIRTIO_DEVICE, | |
1505 | .instance_size = sizeof(VirtIOMEM), | |
1506 | .instance_init = virtio_mem_instance_init, | |
1507 | .class_init = virtio_mem_class_init, | |
1508 | .class_size = sizeof(VirtIOMEMClass), | |
2044969f DH |
1509 | .interfaces = (InterfaceInfo[]) { |
1510 | { TYPE_RAM_DISCARD_MANAGER }, | |
1511 | { } | |
1512 | }, | |
910b2576 DH |
1513 | }; |
1514 | ||
1515 | static void virtio_register_types(void) | |
1516 | { | |
1517 | type_register_static(&virtio_mem_info); | |
1518 | } | |
1519 | ||
1520 | type_init(virtio_register_types) |