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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" | |
910b2576 DH |
23 | #include "hw/virtio/virtio-mem.h" |
24 | #include "qapi/error.h" | |
25 | #include "qapi/visitor.h" | |
26 | #include "exec/ram_addr.h" | |
27 | #include "migration/misc.h" | |
28 | #include "hw/boards.h" | |
29 | #include "hw/qdev-properties.h" | |
2becc36a | 30 | #include CONFIG_DEVICES |
43e54950 | 31 | #include "trace.h" |
910b2576 | 32 | |
3b95a71b DH |
33 | static const VMStateDescription vmstate_virtio_mem_device_early; |
34 | ||
23ad8dec DH |
35 | /* |
36 | * We only had legacy x86 guests that did not support | |
37 | * VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE. Other targets don't have legacy guests. | |
38 | */ | |
39 | #if defined(TARGET_X86_64) || defined(TARGET_I386) | |
40 | #define VIRTIO_MEM_HAS_LEGACY_GUESTS | |
41 | #endif | |
42 | ||
910b2576 | 43 | /* |
228957fe DH |
44 | * Let's not allow blocks smaller than 1 MiB, for example, to keep the tracking |
45 | * bitmap small. | |
910b2576 | 46 | */ |
228957fe DH |
47 | #define VIRTIO_MEM_MIN_BLOCK_SIZE ((uint32_t)(1 * MiB)) |
48 | ||
1263615e GS |
49 | static uint32_t virtio_mem_default_thp_size(void) |
50 | { | |
51 | uint32_t default_thp_size = VIRTIO_MEM_MIN_BLOCK_SIZE; | |
52 | ||
53 | #if defined(__x86_64__) || defined(__arm__) || defined(__powerpc64__) | |
54 | default_thp_size = 2 * MiB; | |
55 | #elif defined(__aarch64__) | |
8e3b0cbb | 56 | if (qemu_real_host_page_size() == 4 * KiB) { |
1263615e | 57 | default_thp_size = 2 * MiB; |
8e3b0cbb | 58 | } else if (qemu_real_host_page_size() == 16 * KiB) { |
1263615e | 59 | default_thp_size = 32 * MiB; |
8e3b0cbb | 60 | } else if (qemu_real_host_page_size() == 64 * KiB) { |
1263615e GS |
61 | default_thp_size = 512 * MiB; |
62 | } | |
228957fe DH |
63 | #endif |
64 | ||
1263615e GS |
65 | return default_thp_size; |
66 | } | |
67 | ||
228957fe DH |
68 | /* |
69 | * We want to have a reasonable default block size such that | |
70 | * 1. We avoid splitting THPs when unplugging memory, which degrades | |
71 | * performance. | |
72 | * 2. We avoid placing THPs for plugged blocks that also cover unplugged | |
73 | * blocks. | |
74 | * | |
75 | * The actual THP size might differ between Linux kernels, so we try to probe | |
76 | * it. In the future (if we ever run into issues regarding 2.), we might want | |
77 | * to disable THP in case we fail to properly probe the THP size, or if the | |
78 | * block size is configured smaller than the THP size. | |
79 | */ | |
80 | static uint32_t thp_size; | |
81 | ||
82 | #define HPAGE_PMD_SIZE_PATH "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size" | |
83 | static uint32_t virtio_mem_thp_size(void) | |
84 | { | |
85 | gchar *content = NULL; | |
86 | const char *endptr; | |
87 | uint64_t tmp; | |
88 | ||
89 | if (thp_size) { | |
90 | return thp_size; | |
91 | } | |
92 | ||
93 | /* | |
94 | * Try to probe the actual THP size, fallback to (sane but eventually | |
95 | * incorrect) default sizes. | |
96 | */ | |
97 | if (g_file_get_contents(HPAGE_PMD_SIZE_PATH, &content, NULL, NULL) && | |
98 | !qemu_strtou64(content, &endptr, 0, &tmp) && | |
99 | (!endptr || *endptr == '\n')) { | |
1263615e GS |
100 | /* Sanity-check the value and fallback to something reasonable. */ |
101 | if (!tmp || !is_power_of_2(tmp)) { | |
228957fe DH |
102 | warn_report("Read unsupported THP size: %" PRIx64, tmp); |
103 | } else { | |
104 | thp_size = tmp; | |
105 | } | |
106 | } | |
107 | ||
108 | if (!thp_size) { | |
1263615e | 109 | thp_size = virtio_mem_default_thp_size(); |
228957fe DH |
110 | warn_report("Could not detect THP size, falling back to %" PRIx64 |
111 | " MiB.", thp_size / MiB); | |
112 | } | |
113 | ||
114 | g_free(content); | |
115 | return thp_size; | |
116 | } | |
117 | ||
118 | static uint64_t virtio_mem_default_block_size(RAMBlock *rb) | |
119 | { | |
120 | const uint64_t page_size = qemu_ram_pagesize(rb); | |
121 | ||
122 | /* We can have hugetlbfs with a page size smaller than the THP size. */ | |
8e3b0cbb | 123 | if (page_size == qemu_real_host_page_size()) { |
228957fe DH |
124 | return MAX(page_size, virtio_mem_thp_size()); |
125 | } | |
126 | return MAX(page_size, VIRTIO_MEM_MIN_BLOCK_SIZE); | |
127 | } | |
128 | ||
23ad8dec DH |
129 | #if defined(VIRTIO_MEM_HAS_LEGACY_GUESTS) |
130 | static bool virtio_mem_has_shared_zeropage(RAMBlock *rb) | |
131 | { | |
132 | /* | |
133 | * We only have a guaranteed shared zeropage on ordinary MAP_PRIVATE | |
134 | * anonymous RAM. In any other case, reading unplugged *can* populate a | |
135 | * fresh page, consuming actual memory. | |
136 | */ | |
21e64350 | 137 | return !qemu_ram_is_shared(rb) && qemu_ram_get_fd(rb) < 0 && |
8e3b0cbb | 138 | qemu_ram_pagesize(rb) == qemu_real_host_page_size(); |
23ad8dec DH |
139 | } |
140 | #endif /* VIRTIO_MEM_HAS_LEGACY_GUESTS */ | |
141 | ||
910b2576 DH |
142 | /* |
143 | * Size the usable region bigger than the requested size if possible. Esp. | |
144 | * Linux guests will only add (aligned) memory blocks in case they fully | |
145 | * fit into the usable region, but plug+online only a subset of the pages. | |
146 | * The memory block size corresponds mostly to the section size. | |
147 | * | |
148 | * This allows e.g., to add 20MB with a section size of 128MB on x86_64, and | |
b1b87327 | 149 | * a section size of 512MB on arm64 (as long as the start address is properly |
910b2576 DH |
150 | * aligned, similar to ordinary DIMMs). |
151 | * | |
152 | * We can change this at any time and maybe even make it configurable if | |
153 | * necessary (as the section size can change). But it's more likely that the | |
154 | * section size will rather get smaller and not bigger over time. | |
155 | */ | |
156 | #if defined(TARGET_X86_64) || defined(TARGET_I386) | |
157 | #define VIRTIO_MEM_USABLE_EXTENT (2 * (128 * MiB)) | |
b1b87327 GS |
158 | #elif defined(TARGET_ARM) |
159 | #define VIRTIO_MEM_USABLE_EXTENT (2 * (512 * MiB)) | |
910b2576 DH |
160 | #else |
161 | #error VIRTIO_MEM_USABLE_EXTENT not defined | |
162 | #endif | |
163 | ||
164 | static bool virtio_mem_is_busy(void) | |
165 | { | |
166 | /* | |
167 | * Postcopy cannot handle concurrent discards and we don't want to migrate | |
168 | * pages on-demand with stale content when plugging new blocks. | |
0bc7806c DH |
169 | * |
170 | * For precopy, we don't want unplugged blocks in our migration stream, and | |
171 | * when plugging new blocks, the page content might differ between source | |
172 | * and destination (observable by the guest when not initializing pages | |
173 | * after plugging them) until we're running on the destination (as we didn't | |
174 | * migrate these blocks when they were unplugged). | |
910b2576 | 175 | */ |
0bc7806c | 176 | return migration_in_incoming_postcopy() || !migration_is_idle(); |
910b2576 DH |
177 | } |
178 | ||
7a9d5d02 DH |
179 | typedef int (*virtio_mem_range_cb)(const VirtIOMEM *vmem, void *arg, |
180 | uint64_t offset, uint64_t size); | |
181 | ||
182 | static int virtio_mem_for_each_unplugged_range(const VirtIOMEM *vmem, void *arg, | |
183 | virtio_mem_range_cb cb) | |
184 | { | |
185 | unsigned long first_zero_bit, last_zero_bit; | |
186 | uint64_t offset, size; | |
187 | int ret = 0; | |
188 | ||
189 | first_zero_bit = find_first_zero_bit(vmem->bitmap, vmem->bitmap_size); | |
190 | while (first_zero_bit < vmem->bitmap_size) { | |
191 | offset = first_zero_bit * vmem->block_size; | |
192 | last_zero_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, | |
193 | first_zero_bit + 1) - 1; | |
194 | size = (last_zero_bit - first_zero_bit + 1) * vmem->block_size; | |
195 | ||
196 | ret = cb(vmem, arg, offset, size); | |
197 | if (ret) { | |
198 | break; | |
199 | } | |
200 | first_zero_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, | |
201 | last_zero_bit + 2); | |
202 | } | |
203 | return ret; | |
204 | } | |
205 | ||
d71920d4 DH |
206 | static int virtio_mem_for_each_plugged_range(const VirtIOMEM *vmem, void *arg, |
207 | virtio_mem_range_cb cb) | |
208 | { | |
209 | unsigned long first_bit, last_bit; | |
210 | uint64_t offset, size; | |
211 | int ret = 0; | |
212 | ||
213 | first_bit = find_first_bit(vmem->bitmap, vmem->bitmap_size); | |
214 | while (first_bit < vmem->bitmap_size) { | |
215 | offset = first_bit * vmem->block_size; | |
216 | last_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, | |
217 | first_bit + 1) - 1; | |
218 | size = (last_bit - first_bit + 1) * vmem->block_size; | |
219 | ||
220 | ret = cb(vmem, arg, offset, size); | |
221 | if (ret) { | |
222 | break; | |
223 | } | |
224 | first_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, | |
225 | last_bit + 2); | |
226 | } | |
227 | return ret; | |
228 | } | |
229 | ||
2044969f DH |
230 | /* |
231 | * Adjust the memory section to cover the intersection with the given range. | |
232 | * | |
233 | * Returns false if the intersection is empty, otherwise returns true. | |
234 | */ | |
82ba778e | 235 | static bool virtio_mem_intersect_memory_section(MemoryRegionSection *s, |
2044969f DH |
236 | uint64_t offset, uint64_t size) |
237 | { | |
238 | uint64_t start = MAX(s->offset_within_region, offset); | |
239 | uint64_t end = MIN(s->offset_within_region + int128_get64(s->size), | |
240 | offset + size); | |
241 | ||
242 | if (end <= start) { | |
243 | return false; | |
244 | } | |
245 | ||
246 | s->offset_within_address_space += start - s->offset_within_region; | |
247 | s->offset_within_region = start; | |
248 | s->size = int128_make64(end - start); | |
249 | return true; | |
250 | } | |
251 | ||
252 | typedef int (*virtio_mem_section_cb)(MemoryRegionSection *s, void *arg); | |
253 | ||
254 | static int virtio_mem_for_each_plugged_section(const VirtIOMEM *vmem, | |
255 | MemoryRegionSection *s, | |
256 | void *arg, | |
257 | virtio_mem_section_cb cb) | |
258 | { | |
259 | unsigned long first_bit, last_bit; | |
260 | uint64_t offset, size; | |
261 | int ret = 0; | |
262 | ||
b11cf32e | 263 | first_bit = s->offset_within_region / vmem->block_size; |
2044969f DH |
264 | first_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, first_bit); |
265 | while (first_bit < vmem->bitmap_size) { | |
266 | MemoryRegionSection tmp = *s; | |
267 | ||
268 | offset = first_bit * vmem->block_size; | |
269 | last_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, | |
270 | first_bit + 1) - 1; | |
271 | size = (last_bit - first_bit + 1) * vmem->block_size; | |
272 | ||
82ba778e | 273 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
2044969f DH |
274 | break; |
275 | } | |
276 | ret = cb(&tmp, arg); | |
277 | if (ret) { | |
278 | break; | |
279 | } | |
280 | first_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, | |
281 | last_bit + 2); | |
282 | } | |
283 | return ret; | |
284 | } | |
285 | ||
372aa6fd DH |
286 | static int virtio_mem_for_each_unplugged_section(const VirtIOMEM *vmem, |
287 | MemoryRegionSection *s, | |
288 | void *arg, | |
289 | virtio_mem_section_cb cb) | |
290 | { | |
291 | unsigned long first_bit, last_bit; | |
292 | uint64_t offset, size; | |
293 | int ret = 0; | |
294 | ||
b11cf32e | 295 | first_bit = s->offset_within_region / vmem->block_size; |
372aa6fd DH |
296 | first_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, first_bit); |
297 | while (first_bit < vmem->bitmap_size) { | |
298 | MemoryRegionSection tmp = *s; | |
299 | ||
300 | offset = first_bit * vmem->block_size; | |
301 | last_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size, | |
302 | first_bit + 1) - 1; | |
303 | size = (last_bit - first_bit + 1) * vmem->block_size; | |
304 | ||
82ba778e | 305 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
372aa6fd DH |
306 | break; |
307 | } | |
308 | ret = cb(&tmp, arg); | |
309 | if (ret) { | |
310 | break; | |
311 | } | |
312 | first_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size, | |
313 | last_bit + 2); | |
314 | } | |
315 | return ret; | |
316 | } | |
317 | ||
2044969f DH |
318 | static int virtio_mem_notify_populate_cb(MemoryRegionSection *s, void *arg) |
319 | { | |
320 | RamDiscardListener *rdl = arg; | |
321 | ||
322 | return rdl->notify_populate(rdl, s); | |
323 | } | |
324 | ||
325 | static int virtio_mem_notify_discard_cb(MemoryRegionSection *s, void *arg) | |
326 | { | |
327 | RamDiscardListener *rdl = arg; | |
328 | ||
329 | rdl->notify_discard(rdl, s); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static void virtio_mem_notify_unplug(VirtIOMEM *vmem, uint64_t offset, | |
334 | uint64_t size) | |
335 | { | |
336 | RamDiscardListener *rdl; | |
337 | ||
338 | QLIST_FOREACH(rdl, &vmem->rdl_list, next) { | |
339 | MemoryRegionSection tmp = *rdl->section; | |
340 | ||
82ba778e | 341 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
2044969f DH |
342 | continue; |
343 | } | |
344 | rdl->notify_discard(rdl, &tmp); | |
345 | } | |
346 | } | |
347 | ||
348 | static int virtio_mem_notify_plug(VirtIOMEM *vmem, uint64_t offset, | |
349 | uint64_t size) | |
350 | { | |
351 | RamDiscardListener *rdl, *rdl2; | |
352 | int ret = 0; | |
353 | ||
354 | QLIST_FOREACH(rdl, &vmem->rdl_list, next) { | |
355 | MemoryRegionSection tmp = *rdl->section; | |
356 | ||
82ba778e | 357 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
2044969f DH |
358 | continue; |
359 | } | |
360 | ret = rdl->notify_populate(rdl, &tmp); | |
361 | if (ret) { | |
362 | break; | |
363 | } | |
364 | } | |
365 | ||
366 | if (ret) { | |
367 | /* Notify all already-notified listeners. */ | |
368 | QLIST_FOREACH(rdl2, &vmem->rdl_list, next) { | |
29f1b328 | 369 | MemoryRegionSection tmp = *rdl2->section; |
2044969f DH |
370 | |
371 | if (rdl2 == rdl) { | |
372 | break; | |
373 | } | |
82ba778e | 374 | if (!virtio_mem_intersect_memory_section(&tmp, offset, size)) { |
2044969f DH |
375 | continue; |
376 | } | |
377 | rdl2->notify_discard(rdl2, &tmp); | |
378 | } | |
379 | } | |
380 | return ret; | |
381 | } | |
382 | ||
383 | static void virtio_mem_notify_unplug_all(VirtIOMEM *vmem) | |
384 | { | |
385 | RamDiscardListener *rdl; | |
386 | ||
387 | if (!vmem->size) { | |
388 | return; | |
389 | } | |
390 | ||
391 | QLIST_FOREACH(rdl, &vmem->rdl_list, next) { | |
392 | if (rdl->double_discard_supported) { | |
393 | rdl->notify_discard(rdl, rdl->section); | |
394 | } else { | |
395 | virtio_mem_for_each_plugged_section(vmem, rdl->section, rdl, | |
396 | virtio_mem_notify_discard_cb); | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
25c89303 DH |
401 | static bool virtio_mem_is_range_plugged(const VirtIOMEM *vmem, |
402 | uint64_t start_gpa, uint64_t size) | |
910b2576 DH |
403 | { |
404 | const unsigned long first_bit = (start_gpa - vmem->addr) / vmem->block_size; | |
405 | const unsigned long last_bit = first_bit + (size / vmem->block_size) - 1; | |
406 | unsigned long found_bit; | |
407 | ||
408 | /* We fake a shorter bitmap to avoid searching too far. */ | |
25c89303 | 409 | found_bit = find_next_zero_bit(vmem->bitmap, last_bit + 1, first_bit); |
910b2576 DH |
410 | return found_bit > last_bit; |
411 | } | |
412 | ||
25c89303 DH |
413 | static bool virtio_mem_is_range_unplugged(const VirtIOMEM *vmem, |
414 | uint64_t start_gpa, uint64_t size) | |
415 | { | |
416 | const unsigned long first_bit = (start_gpa - vmem->addr) / vmem->block_size; | |
417 | const unsigned long last_bit = first_bit + (size / vmem->block_size) - 1; | |
418 | unsigned long found_bit; | |
419 | ||
420 | /* We fake a shorter bitmap to avoid searching too far. */ | |
421 | found_bit = find_next_bit(vmem->bitmap, last_bit + 1, first_bit); | |
422 | return found_bit > last_bit; | |
423 | } | |
424 | ||
425 | static void virtio_mem_set_range_plugged(VirtIOMEM *vmem, uint64_t start_gpa, | |
426 | uint64_t size) | |
910b2576 DH |
427 | { |
428 | const unsigned long bit = (start_gpa - vmem->addr) / vmem->block_size; | |
429 | const unsigned long nbits = size / vmem->block_size; | |
430 | ||
25c89303 DH |
431 | bitmap_set(vmem->bitmap, bit, nbits); |
432 | } | |
433 | ||
434 | static void virtio_mem_set_range_unplugged(VirtIOMEM *vmem, uint64_t start_gpa, | |
435 | uint64_t size) | |
436 | { | |
437 | const unsigned long bit = (start_gpa - vmem->addr) / vmem->block_size; | |
438 | const unsigned long nbits = size / vmem->block_size; | |
439 | ||
440 | bitmap_clear(vmem->bitmap, bit, nbits); | |
910b2576 DH |
441 | } |
442 | ||
443 | static void virtio_mem_send_response(VirtIOMEM *vmem, VirtQueueElement *elem, | |
444 | struct virtio_mem_resp *resp) | |
445 | { | |
446 | VirtIODevice *vdev = VIRTIO_DEVICE(vmem); | |
447 | VirtQueue *vq = vmem->vq; | |
448 | ||
43e54950 | 449 | trace_virtio_mem_send_response(le16_to_cpu(resp->type)); |
910b2576 DH |
450 | iov_from_buf(elem->in_sg, elem->in_num, 0, resp, sizeof(*resp)); |
451 | ||
452 | virtqueue_push(vq, elem, sizeof(*resp)); | |
453 | virtio_notify(vdev, vq); | |
454 | } | |
455 | ||
456 | static void virtio_mem_send_response_simple(VirtIOMEM *vmem, | |
457 | VirtQueueElement *elem, | |
458 | uint16_t type) | |
459 | { | |
460 | struct virtio_mem_resp resp = { | |
461 | .type = cpu_to_le16(type), | |
462 | }; | |
463 | ||
464 | virtio_mem_send_response(vmem, elem, &resp); | |
465 | } | |
466 | ||
2044969f DH |
467 | static bool virtio_mem_valid_range(const VirtIOMEM *vmem, uint64_t gpa, |
468 | uint64_t size) | |
910b2576 DH |
469 | { |
470 | if (!QEMU_IS_ALIGNED(gpa, vmem->block_size)) { | |
471 | return false; | |
472 | } | |
473 | if (gpa + size < gpa || !size) { | |
474 | return false; | |
475 | } | |
476 | if (gpa < vmem->addr || gpa >= vmem->addr + vmem->usable_region_size) { | |
477 | return false; | |
478 | } | |
479 | if (gpa + size > vmem->addr + vmem->usable_region_size) { | |
480 | return false; | |
481 | } | |
482 | return true; | |
483 | } | |
484 | ||
485 | static int virtio_mem_set_block_state(VirtIOMEM *vmem, uint64_t start_gpa, | |
486 | uint64_t size, bool plug) | |
487 | { | |
488 | const uint64_t offset = start_gpa - vmem->addr; | |
3aca6380 | 489 | RAMBlock *rb = vmem->memdev->mr.ram_block; |
25c89303 | 490 | int ret = 0; |
910b2576 DH |
491 | |
492 | if (virtio_mem_is_busy()) { | |
493 | return -EBUSY; | |
494 | } | |
495 | ||
496 | if (!plug) { | |
3aca6380 | 497 | if (ram_block_discard_range(rb, offset, size)) { |
910b2576 DH |
498 | return -EBUSY; |
499 | } | |
2044969f | 500 | virtio_mem_notify_unplug(vmem, offset, size); |
25c89303 DH |
501 | virtio_mem_set_range_unplugged(vmem, start_gpa, size); |
502 | return 0; | |
503 | } | |
504 | ||
505 | if (vmem->prealloc) { | |
506 | void *area = memory_region_get_ram_ptr(&vmem->memdev->mr) + offset; | |
507 | int fd = memory_region_get_fd(&vmem->memdev->mr); | |
508 | Error *local_err = NULL; | |
509 | ||
510 | qemu_prealloc_mem(fd, area, size, 1, NULL, &local_err); | |
511 | if (local_err) { | |
512 | static bool warned; | |
513 | ||
514 | /* | |
515 | * Warn only once, we don't want to fill the log with these | |
516 | * warnings. | |
517 | */ | |
518 | if (!warned) { | |
519 | warn_report_err(local_err); | |
520 | warned = true; | |
521 | } else { | |
522 | error_free(local_err); | |
09b3b7e0 | 523 | } |
25c89303 | 524 | ret = -EBUSY; |
09b3b7e0 | 525 | } |
25c89303 | 526 | } |
09b3b7e0 | 527 | |
25c89303 DH |
528 | if (!ret) { |
529 | ret = virtio_mem_notify_plug(vmem, offset, size); | |
910b2576 | 530 | } |
25c89303 DH |
531 | if (ret) { |
532 | /* Could be preallocation or a notifier populated memory. */ | |
533 | ram_block_discard_range(vmem->memdev->mr.ram_block, offset, size); | |
534 | return -EBUSY; | |
535 | } | |
536 | ||
537 | virtio_mem_set_range_plugged(vmem, start_gpa, size); | |
910b2576 DH |
538 | return 0; |
539 | } | |
540 | ||
541 | static int virtio_mem_state_change_request(VirtIOMEM *vmem, uint64_t gpa, | |
542 | uint16_t nb_blocks, bool plug) | |
543 | { | |
544 | const uint64_t size = nb_blocks * vmem->block_size; | |
545 | int ret; | |
546 | ||
547 | if (!virtio_mem_valid_range(vmem, gpa, size)) { | |
548 | return VIRTIO_MEM_RESP_ERROR; | |
549 | } | |
550 | ||
551 | if (plug && (vmem->size + size > vmem->requested_size)) { | |
552 | return VIRTIO_MEM_RESP_NACK; | |
553 | } | |
554 | ||
555 | /* test if really all blocks are in the opposite state */ | |
25c89303 DH |
556 | if ((plug && !virtio_mem_is_range_unplugged(vmem, gpa, size)) || |
557 | (!plug && !virtio_mem_is_range_plugged(vmem, gpa, size))) { | |
910b2576 DH |
558 | return VIRTIO_MEM_RESP_ERROR; |
559 | } | |
560 | ||
561 | ret = virtio_mem_set_block_state(vmem, gpa, size, plug); | |
562 | if (ret) { | |
563 | return VIRTIO_MEM_RESP_BUSY; | |
564 | } | |
565 | if (plug) { | |
566 | vmem->size += size; | |
567 | } else { | |
568 | vmem->size -= size; | |
569 | } | |
c95b4437 | 570 | notifier_list_notify(&vmem->size_change_notifiers, &vmem->size); |
910b2576 DH |
571 | return VIRTIO_MEM_RESP_ACK; |
572 | } | |
573 | ||
574 | static void virtio_mem_plug_request(VirtIOMEM *vmem, VirtQueueElement *elem, | |
575 | struct virtio_mem_req *req) | |
576 | { | |
577 | const uint64_t gpa = le64_to_cpu(req->u.plug.addr); | |
578 | const uint16_t nb_blocks = le16_to_cpu(req->u.plug.nb_blocks); | |
579 | uint16_t type; | |
580 | ||
43e54950 | 581 | trace_virtio_mem_plug_request(gpa, nb_blocks); |
910b2576 DH |
582 | type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, true); |
583 | virtio_mem_send_response_simple(vmem, elem, type); | |
584 | } | |
585 | ||
586 | static void virtio_mem_unplug_request(VirtIOMEM *vmem, VirtQueueElement *elem, | |
587 | struct virtio_mem_req *req) | |
588 | { | |
589 | const uint64_t gpa = le64_to_cpu(req->u.unplug.addr); | |
590 | const uint16_t nb_blocks = le16_to_cpu(req->u.unplug.nb_blocks); | |
591 | uint16_t type; | |
592 | ||
43e54950 | 593 | trace_virtio_mem_unplug_request(gpa, nb_blocks); |
910b2576 DH |
594 | type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, false); |
595 | virtio_mem_send_response_simple(vmem, elem, type); | |
596 | } | |
597 | ||
598 | static void virtio_mem_resize_usable_region(VirtIOMEM *vmem, | |
599 | uint64_t requested_size, | |
600 | bool can_shrink) | |
601 | { | |
602 | uint64_t newsize = MIN(memory_region_size(&vmem->memdev->mr), | |
603 | requested_size + VIRTIO_MEM_USABLE_EXTENT); | |
604 | ||
0aed2800 DH |
605 | /* The usable region size always has to be multiples of the block size. */ |
606 | newsize = QEMU_ALIGN_UP(newsize, vmem->block_size); | |
607 | ||
910b2576 DH |
608 | if (!requested_size) { |
609 | newsize = 0; | |
610 | } | |
611 | ||
612 | if (newsize < vmem->usable_region_size && !can_shrink) { | |
613 | return; | |
614 | } | |
615 | ||
43e54950 | 616 | trace_virtio_mem_resized_usable_region(vmem->usable_region_size, newsize); |
910b2576 DH |
617 | vmem->usable_region_size = newsize; |
618 | } | |
619 | ||
620 | static int virtio_mem_unplug_all(VirtIOMEM *vmem) | |
621 | { | |
622 | RAMBlock *rb = vmem->memdev->mr.ram_block; | |
910b2576 DH |
623 | |
624 | if (virtio_mem_is_busy()) { | |
625 | return -EBUSY; | |
626 | } | |
627 | ||
3aca6380 | 628 | if (ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb))) { |
910b2576 DH |
629 | return -EBUSY; |
630 | } | |
2044969f DH |
631 | virtio_mem_notify_unplug_all(vmem); |
632 | ||
910b2576 | 633 | bitmap_clear(vmem->bitmap, 0, vmem->bitmap_size); |
c95b4437 DH |
634 | if (vmem->size) { |
635 | vmem->size = 0; | |
636 | notifier_list_notify(&vmem->size_change_notifiers, &vmem->size); | |
637 | } | |
43e54950 | 638 | trace_virtio_mem_unplugged_all(); |
910b2576 DH |
639 | virtio_mem_resize_usable_region(vmem, vmem->requested_size, true); |
640 | return 0; | |
641 | } | |
642 | ||
643 | static void virtio_mem_unplug_all_request(VirtIOMEM *vmem, | |
644 | VirtQueueElement *elem) | |
645 | { | |
43e54950 | 646 | trace_virtio_mem_unplug_all_request(); |
910b2576 DH |
647 | if (virtio_mem_unplug_all(vmem)) { |
648 | virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_BUSY); | |
649 | } else { | |
650 | virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ACK); | |
651 | } | |
652 | } | |
653 | ||
654 | static void virtio_mem_state_request(VirtIOMEM *vmem, VirtQueueElement *elem, | |
655 | struct virtio_mem_req *req) | |
656 | { | |
657 | const uint16_t nb_blocks = le16_to_cpu(req->u.state.nb_blocks); | |
658 | const uint64_t gpa = le64_to_cpu(req->u.state.addr); | |
659 | const uint64_t size = nb_blocks * vmem->block_size; | |
660 | struct virtio_mem_resp resp = { | |
661 | .type = cpu_to_le16(VIRTIO_MEM_RESP_ACK), | |
662 | }; | |
663 | ||
43e54950 | 664 | trace_virtio_mem_state_request(gpa, nb_blocks); |
910b2576 DH |
665 | if (!virtio_mem_valid_range(vmem, gpa, size)) { |
666 | virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ERROR); | |
667 | return; | |
668 | } | |
669 | ||
25c89303 | 670 | if (virtio_mem_is_range_plugged(vmem, gpa, size)) { |
910b2576 | 671 | resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_PLUGGED); |
25c89303 | 672 | } else if (virtio_mem_is_range_unplugged(vmem, gpa, size)) { |
910b2576 DH |
673 | resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_UNPLUGGED); |
674 | } else { | |
675 | resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_MIXED); | |
676 | } | |
43e54950 | 677 | trace_virtio_mem_state_response(le16_to_cpu(resp.u.state.state)); |
910b2576 DH |
678 | virtio_mem_send_response(vmem, elem, &resp); |
679 | } | |
680 | ||
681 | static void virtio_mem_handle_request(VirtIODevice *vdev, VirtQueue *vq) | |
682 | { | |
683 | const int len = sizeof(struct virtio_mem_req); | |
684 | VirtIOMEM *vmem = VIRTIO_MEM(vdev); | |
685 | VirtQueueElement *elem; | |
686 | struct virtio_mem_req req; | |
687 | uint16_t type; | |
688 | ||
689 | while (true) { | |
690 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); | |
691 | if (!elem) { | |
692 | return; | |
693 | } | |
694 | ||
695 | if (iov_to_buf(elem->out_sg, elem->out_num, 0, &req, len) < len) { | |
696 | virtio_error(vdev, "virtio-mem protocol violation: invalid request" | |
697 | " size: %d", len); | |
0c404e45 | 698 | virtqueue_detach_element(vq, elem, 0); |
910b2576 DH |
699 | g_free(elem); |
700 | return; | |
701 | } | |
702 | ||
703 | if (iov_size(elem->in_sg, elem->in_num) < | |
704 | sizeof(struct virtio_mem_resp)) { | |
705 | virtio_error(vdev, "virtio-mem protocol violation: not enough space" | |
706 | " for response: %zu", | |
707 | iov_size(elem->in_sg, elem->in_num)); | |
0c404e45 | 708 | virtqueue_detach_element(vq, elem, 0); |
910b2576 DH |
709 | g_free(elem); |
710 | return; | |
711 | } | |
712 | ||
713 | type = le16_to_cpu(req.type); | |
714 | switch (type) { | |
715 | case VIRTIO_MEM_REQ_PLUG: | |
716 | virtio_mem_plug_request(vmem, elem, &req); | |
717 | break; | |
718 | case VIRTIO_MEM_REQ_UNPLUG: | |
719 | virtio_mem_unplug_request(vmem, elem, &req); | |
720 | break; | |
721 | case VIRTIO_MEM_REQ_UNPLUG_ALL: | |
722 | virtio_mem_unplug_all_request(vmem, elem); | |
723 | break; | |
724 | case VIRTIO_MEM_REQ_STATE: | |
725 | virtio_mem_state_request(vmem, elem, &req); | |
726 | break; | |
727 | default: | |
728 | virtio_error(vdev, "virtio-mem protocol violation: unknown request" | |
729 | " type: %d", type); | |
0c404e45 | 730 | virtqueue_detach_element(vq, elem, 0); |
910b2576 DH |
731 | g_free(elem); |
732 | return; | |
733 | } | |
734 | ||
735 | g_free(elem); | |
736 | } | |
737 | } | |
738 | ||
739 | static void virtio_mem_get_config(VirtIODevice *vdev, uint8_t *config_data) | |
740 | { | |
741 | VirtIOMEM *vmem = VIRTIO_MEM(vdev); | |
742 | struct virtio_mem_config *config = (void *) config_data; | |
743 | ||
744 | config->block_size = cpu_to_le64(vmem->block_size); | |
745 | config->node_id = cpu_to_le16(vmem->node); | |
746 | config->requested_size = cpu_to_le64(vmem->requested_size); | |
747 | config->plugged_size = cpu_to_le64(vmem->size); | |
748 | config->addr = cpu_to_le64(vmem->addr); | |
749 | config->region_size = cpu_to_le64(memory_region_size(&vmem->memdev->mr)); | |
750 | config->usable_region_size = cpu_to_le64(vmem->usable_region_size); | |
751 | } | |
752 | ||
753 | static uint64_t virtio_mem_get_features(VirtIODevice *vdev, uint64_t features, | |
754 | Error **errp) | |
755 | { | |
756 | MachineState *ms = MACHINE(qdev_get_machine()); | |
23ad8dec | 757 | VirtIOMEM *vmem = VIRTIO_MEM(vdev); |
910b2576 DH |
758 | |
759 | if (ms->numa_state) { | |
760 | #if defined(CONFIG_ACPI) | |
761 | virtio_add_feature(&features, VIRTIO_MEM_F_ACPI_PXM); | |
762 | #endif | |
763 | } | |
23ad8dec DH |
764 | assert(vmem->unplugged_inaccessible != ON_OFF_AUTO_AUTO); |
765 | if (vmem->unplugged_inaccessible == ON_OFF_AUTO_ON) { | |
766 | virtio_add_feature(&features, VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE); | |
767 | } | |
910b2576 DH |
768 | return features; |
769 | } | |
770 | ||
23ad8dec DH |
771 | static int virtio_mem_validate_features(VirtIODevice *vdev) |
772 | { | |
773 | if (virtio_host_has_feature(vdev, VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE) && | |
774 | !virtio_vdev_has_feature(vdev, VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE)) { | |
775 | return -EFAULT; | |
776 | } | |
777 | return 0; | |
778 | } | |
779 | ||
910b2576 DH |
780 | static void virtio_mem_system_reset(void *opaque) |
781 | { | |
782 | VirtIOMEM *vmem = VIRTIO_MEM(opaque); | |
783 | ||
784 | /* | |
785 | * During usual resets, we will unplug all memory and shrink the usable | |
786 | * region size. This is, however, not possible in all scenarios. Then, | |
787 | * the guest has to deal with this manually (VIRTIO_MEM_REQ_UNPLUG_ALL). | |
788 | */ | |
789 | virtio_mem_unplug_all(vmem); | |
790 | } | |
791 | ||
792 | static void virtio_mem_device_realize(DeviceState *dev, Error **errp) | |
793 | { | |
794 | MachineState *ms = MACHINE(qdev_get_machine()); | |
795 | int nb_numa_nodes = ms->numa_state ? ms->numa_state->num_nodes : 0; | |
796 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
797 | VirtIOMEM *vmem = VIRTIO_MEM(dev); | |
798 | uint64_t page_size; | |
799 | RAMBlock *rb; | |
800 | int ret; | |
801 | ||
802 | if (!vmem->memdev) { | |
803 | error_setg(errp, "'%s' property is not set", VIRTIO_MEM_MEMDEV_PROP); | |
804 | return; | |
805 | } else if (host_memory_backend_is_mapped(vmem->memdev)) { | |
910b2576 | 806 | error_setg(errp, "'%s' property specifies a busy memdev: %s", |
7a309cc9 MA |
807 | VIRTIO_MEM_MEMDEV_PROP, |
808 | object_get_canonical_path_component(OBJECT(vmem->memdev))); | |
910b2576 DH |
809 | return; |
810 | } else if (!memory_region_is_ram(&vmem->memdev->mr) || | |
811 | memory_region_is_rom(&vmem->memdev->mr) || | |
812 | !vmem->memdev->mr.ram_block) { | |
813 | error_setg(errp, "'%s' property specifies an unsupported memdev", | |
814 | VIRTIO_MEM_MEMDEV_PROP); | |
815 | return; | |
ce1761f0 DH |
816 | } else if (vmem->memdev->prealloc) { |
817 | error_setg(errp, "'%s' property specifies a memdev with preallocation" | |
818 | " enabled: %s. Instead, specify 'prealloc=on' for the" | |
819 | " virtio-mem device. ", VIRTIO_MEM_MEMDEV_PROP, | |
820 | object_get_canonical_path_component(OBJECT(vmem->memdev))); | |
821 | return; | |
910b2576 DH |
822 | } |
823 | ||
824 | if ((nb_numa_nodes && vmem->node >= nb_numa_nodes) || | |
825 | (!nb_numa_nodes && vmem->node)) { | |
826 | error_setg(errp, "'%s' property has value '%" PRIu32 "', which exceeds" | |
827 | "the number of numa nodes: %d", VIRTIO_MEM_NODE_PROP, | |
828 | vmem->node, nb_numa_nodes ? nb_numa_nodes : 1); | |
829 | return; | |
830 | } | |
831 | ||
832 | if (enable_mlock) { | |
833 | error_setg(errp, "Incompatible with mlock"); | |
834 | return; | |
835 | } | |
836 | ||
837 | rb = vmem->memdev->mr.ram_block; | |
838 | page_size = qemu_ram_pagesize(rb); | |
839 | ||
23ad8dec DH |
840 | #if defined(VIRTIO_MEM_HAS_LEGACY_GUESTS) |
841 | switch (vmem->unplugged_inaccessible) { | |
842 | case ON_OFF_AUTO_AUTO: | |
843 | if (virtio_mem_has_shared_zeropage(rb)) { | |
844 | vmem->unplugged_inaccessible = ON_OFF_AUTO_OFF; | |
845 | } else { | |
846 | vmem->unplugged_inaccessible = ON_OFF_AUTO_ON; | |
847 | } | |
848 | break; | |
849 | case ON_OFF_AUTO_OFF: | |
850 | if (!virtio_mem_has_shared_zeropage(rb)) { | |
851 | warn_report("'%s' property set to 'off' with a memdev that does" | |
852 | " not support the shared zeropage.", | |
853 | VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP); | |
854 | } | |
855 | break; | |
856 | default: | |
857 | break; | |
858 | } | |
859 | #else /* VIRTIO_MEM_HAS_LEGACY_GUESTS */ | |
860 | vmem->unplugged_inaccessible = ON_OFF_AUTO_ON; | |
861 | #endif /* VIRTIO_MEM_HAS_LEGACY_GUESTS */ | |
862 | ||
228957fe DH |
863 | /* |
864 | * If the block size wasn't configured by the user, use a sane default. This | |
865 | * allows using hugetlbfs backends of any page size without manual | |
866 | * intervention. | |
867 | */ | |
868 | if (!vmem->block_size) { | |
869 | vmem->block_size = virtio_mem_default_block_size(rb); | |
870 | } | |
871 | ||
910b2576 DH |
872 | if (vmem->block_size < page_size) { |
873 | error_setg(errp, "'%s' property has to be at least the page size (0x%" | |
874 | PRIx64 ")", VIRTIO_MEM_BLOCK_SIZE_PROP, page_size); | |
875 | return; | |
228957fe DH |
876 | } else if (vmem->block_size < virtio_mem_default_block_size(rb)) { |
877 | warn_report("'%s' property is smaller than the default block size (%" | |
878 | PRIx64 " MiB)", VIRTIO_MEM_BLOCK_SIZE_PROP, | |
879 | virtio_mem_default_block_size(rb) / MiB); | |
7656d9ce DH |
880 | } |
881 | if (!QEMU_IS_ALIGNED(vmem->requested_size, vmem->block_size)) { | |
910b2576 DH |
882 | error_setg(errp, "'%s' property has to be multiples of '%s' (0x%" PRIx64 |
883 | ")", VIRTIO_MEM_REQUESTED_SIZE_PROP, | |
884 | VIRTIO_MEM_BLOCK_SIZE_PROP, vmem->block_size); | |
885 | return; | |
d31992ae DH |
886 | } else if (!QEMU_IS_ALIGNED(vmem->addr, vmem->block_size)) { |
887 | error_setg(errp, "'%s' property has to be multiples of '%s' (0x%" PRIx64 | |
888 | ")", VIRTIO_MEM_ADDR_PROP, VIRTIO_MEM_BLOCK_SIZE_PROP, | |
889 | vmem->block_size); | |
890 | return; | |
910b2576 DH |
891 | } else if (!QEMU_IS_ALIGNED(memory_region_size(&vmem->memdev->mr), |
892 | vmem->block_size)) { | |
893 | error_setg(errp, "'%s' property memdev size has to be multiples of" | |
894 | "'%s' (0x%" PRIx64 ")", VIRTIO_MEM_MEMDEV_PROP, | |
895 | VIRTIO_MEM_BLOCK_SIZE_PROP, vmem->block_size); | |
896 | return; | |
897 | } | |
898 | ||
bc072ed4 | 899 | if (ram_block_coordinated_discard_require(true)) { |
910b2576 DH |
900 | error_setg(errp, "Discarding RAM is disabled"); |
901 | return; | |
902 | } | |
903 | ||
904 | ret = ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb)); | |
905 | if (ret) { | |
906 | error_setg_errno(errp, -ret, "Unexpected error discarding RAM"); | |
bc072ed4 | 907 | ram_block_coordinated_discard_require(false); |
910b2576 DH |
908 | return; |
909 | } | |
910 | ||
911 | virtio_mem_resize_usable_region(vmem, vmem->requested_size, true); | |
912 | ||
913 | vmem->bitmap_size = memory_region_size(&vmem->memdev->mr) / | |
914 | vmem->block_size; | |
915 | vmem->bitmap = bitmap_new(vmem->bitmap_size); | |
916 | ||
3857cd5c | 917 | virtio_init(vdev, VIRTIO_ID_MEM, sizeof(struct virtio_mem_config)); |
910b2576 DH |
918 | vmem->vq = virtio_add_queue(vdev, 128, virtio_mem_handle_request); |
919 | ||
920 | host_memory_backend_set_mapped(vmem->memdev, true); | |
921 | vmstate_register_ram(&vmem->memdev->mr, DEVICE(vmem)); | |
3b95a71b DH |
922 | if (vmem->early_migration) { |
923 | vmstate_register(VMSTATE_IF(vmem), VMSTATE_INSTANCE_ID_ANY, | |
924 | &vmstate_virtio_mem_device_early, vmem); | |
925 | } | |
910b2576 | 926 | qemu_register_reset(virtio_mem_system_reset, vmem); |
2044969f DH |
927 | |
928 | /* | |
929 | * Set ourselves as RamDiscardManager before the plug handler maps the | |
930 | * memory region and exposes it via an address space. | |
931 | */ | |
932 | memory_region_set_ram_discard_manager(&vmem->memdev->mr, | |
933 | RAM_DISCARD_MANAGER(vmem)); | |
910b2576 DH |
934 | } |
935 | ||
936 | static void virtio_mem_device_unrealize(DeviceState *dev) | |
937 | { | |
938 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
939 | VirtIOMEM *vmem = VIRTIO_MEM(dev); | |
940 | ||
2044969f DH |
941 | /* |
942 | * The unplug handler unmapped the memory region, it cannot be | |
943 | * found via an address space anymore. Unset ourselves. | |
944 | */ | |
945 | memory_region_set_ram_discard_manager(&vmem->memdev->mr, NULL); | |
910b2576 | 946 | qemu_unregister_reset(virtio_mem_system_reset, vmem); |
3b95a71b DH |
947 | if (vmem->early_migration) { |
948 | vmstate_unregister(VMSTATE_IF(vmem), &vmstate_virtio_mem_device_early, | |
949 | vmem); | |
950 | } | |
910b2576 DH |
951 | vmstate_unregister_ram(&vmem->memdev->mr, DEVICE(vmem)); |
952 | host_memory_backend_set_mapped(vmem->memdev, false); | |
953 | virtio_del_queue(vdev, 0); | |
954 | virtio_cleanup(vdev); | |
955 | g_free(vmem->bitmap); | |
bc072ed4 | 956 | ram_block_coordinated_discard_require(false); |
910b2576 DH |
957 | } |
958 | ||
7a9d5d02 DH |
959 | static int virtio_mem_discard_range_cb(const VirtIOMEM *vmem, void *arg, |
960 | uint64_t offset, uint64_t size) | |
910b2576 DH |
961 | { |
962 | RAMBlock *rb = vmem->memdev->mr.ram_block; | |
910b2576 | 963 | |
3aca6380 | 964 | return ram_block_discard_range(rb, offset, size) ? -EINVAL : 0; |
910b2576 DH |
965 | } |
966 | ||
7a9d5d02 DH |
967 | static int virtio_mem_restore_unplugged(VirtIOMEM *vmem) |
968 | { | |
969 | /* Make sure all memory is really discarded after migration. */ | |
970 | return virtio_mem_for_each_unplugged_range(vmem, NULL, | |
971 | virtio_mem_discard_range_cb); | |
972 | } | |
973 | ||
910b2576 DH |
974 | static int virtio_mem_post_load(void *opaque, int version_id) |
975 | { | |
2044969f DH |
976 | VirtIOMEM *vmem = VIRTIO_MEM(opaque); |
977 | RamDiscardListener *rdl; | |
978 | int ret; | |
979 | ||
d71920d4 DH |
980 | if (vmem->prealloc && !vmem->early_migration) { |
981 | warn_report("Proper preallocation with migration requires a newer QEMU machine"); | |
982 | } | |
983 | ||
2044969f DH |
984 | /* |
985 | * We started out with all memory discarded and our memory region is mapped | |
986 | * into an address space. Replay, now that we updated the bitmap. | |
987 | */ | |
988 | QLIST_FOREACH(rdl, &vmem->rdl_list, next) { | |
989 | ret = virtio_mem_for_each_plugged_section(vmem, rdl->section, rdl, | |
990 | virtio_mem_notify_populate_cb); | |
991 | if (ret) { | |
992 | return ret; | |
993 | } | |
994 | } | |
995 | ||
910b2576 DH |
996 | if (migration_in_incoming_postcopy()) { |
997 | return 0; | |
998 | } | |
999 | ||
2044969f | 1000 | return virtio_mem_restore_unplugged(vmem); |
910b2576 DH |
1001 | } |
1002 | ||
d71920d4 DH |
1003 | static int virtio_mem_prealloc_range_cb(const VirtIOMEM *vmem, void *arg, |
1004 | uint64_t offset, uint64_t size) | |
1005 | { | |
1006 | void *area = memory_region_get_ram_ptr(&vmem->memdev->mr) + offset; | |
1007 | int fd = memory_region_get_fd(&vmem->memdev->mr); | |
1008 | Error *local_err = NULL; | |
1009 | ||
1010 | qemu_prealloc_mem(fd, area, size, 1, NULL, &local_err); | |
1011 | if (local_err) { | |
1012 | error_report_err(local_err); | |
1013 | return -ENOMEM; | |
1014 | } | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | static int virtio_mem_post_load_early(void *opaque, int version_id) | |
1019 | { | |
1020 | VirtIOMEM *vmem = VIRTIO_MEM(opaque); | |
1021 | RAMBlock *rb = vmem->memdev->mr.ram_block; | |
1022 | int ret; | |
1023 | ||
1024 | if (!vmem->prealloc) { | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * We restored the bitmap and verified that the basic properties | |
1030 | * match on source and destination, so we can go ahead and preallocate | |
1031 | * memory for all plugged memory blocks, before actual RAM migration starts | |
1032 | * touching this memory. | |
1033 | */ | |
1034 | ret = virtio_mem_for_each_plugged_range(vmem, NULL, | |
1035 | virtio_mem_prealloc_range_cb); | |
1036 | if (ret) { | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * This is tricky: postcopy wants to start with a clean slate. On | |
1042 | * POSTCOPY_INCOMING_ADVISE, postcopy code discards all (ordinarily | |
1043 | * preallocated) RAM such that postcopy will work as expected later. | |
1044 | * | |
1045 | * However, we run after POSTCOPY_INCOMING_ADVISE -- but before actual | |
1046 | * RAM migration. So let's discard all memory again. This looks like an | |
1047 | * expensive NOP, but actually serves a purpose: we made sure that we | |
1048 | * were able to allocate all required backend memory once. We cannot | |
1049 | * guarantee that the backend memory we will free will remain free | |
1050 | * until we need it during postcopy, but at least we can catch the | |
1051 | * obvious setup issues this way. | |
1052 | */ | |
1053 | if (migration_incoming_postcopy_advised()) { | |
1054 | if (ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb))) { | |
1055 | return -EBUSY; | |
1056 | } | |
1057 | } | |
1058 | return 0; | |
1059 | } | |
1060 | ||
383ee445 DH |
1061 | typedef struct VirtIOMEMMigSanityChecks { |
1062 | VirtIOMEM *parent; | |
1063 | uint64_t addr; | |
1064 | uint64_t region_size; | |
1065 | uint64_t block_size; | |
1066 | uint32_t node; | |
1067 | } VirtIOMEMMigSanityChecks; | |
1068 | ||
1069 | static int virtio_mem_mig_sanity_checks_pre_save(void *opaque) | |
1070 | { | |
1071 | VirtIOMEMMigSanityChecks *tmp = opaque; | |
1072 | VirtIOMEM *vmem = tmp->parent; | |
1073 | ||
1074 | tmp->addr = vmem->addr; | |
1075 | tmp->region_size = memory_region_size(&vmem->memdev->mr); | |
1076 | tmp->block_size = vmem->block_size; | |
1077 | tmp->node = vmem->node; | |
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | static int virtio_mem_mig_sanity_checks_post_load(void *opaque, int version_id) | |
1082 | { | |
1083 | VirtIOMEMMigSanityChecks *tmp = opaque; | |
1084 | VirtIOMEM *vmem = tmp->parent; | |
1085 | const uint64_t new_region_size = memory_region_size(&vmem->memdev->mr); | |
1086 | ||
1087 | if (tmp->addr != vmem->addr) { | |
1088 | error_report("Property '%s' changed from 0x%" PRIx64 " to 0x%" PRIx64, | |
1089 | VIRTIO_MEM_ADDR_PROP, tmp->addr, vmem->addr); | |
1090 | return -EINVAL; | |
1091 | } | |
1092 | /* | |
1093 | * Note: Preparation for resizeable memory regions. The maximum size | |
1094 | * of the memory region must not change during migration. | |
1095 | */ | |
1096 | if (tmp->region_size != new_region_size) { | |
1097 | error_report("Property '%s' size changed from 0x%" PRIx64 " to 0x%" | |
1098 | PRIx64, VIRTIO_MEM_MEMDEV_PROP, tmp->region_size, | |
1099 | new_region_size); | |
1100 | return -EINVAL; | |
1101 | } | |
1102 | if (tmp->block_size != vmem->block_size) { | |
1103 | error_report("Property '%s' changed from 0x%" PRIx64 " to 0x%" PRIx64, | |
1104 | VIRTIO_MEM_BLOCK_SIZE_PROP, tmp->block_size, | |
1105 | vmem->block_size); | |
1106 | return -EINVAL; | |
1107 | } | |
1108 | if (tmp->node != vmem->node) { | |
1109 | error_report("Property '%s' changed from %" PRIu32 " to %" PRIu32, | |
1110 | VIRTIO_MEM_NODE_PROP, tmp->node, vmem->node); | |
1111 | return -EINVAL; | |
1112 | } | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | static const VMStateDescription vmstate_virtio_mem_sanity_checks = { | |
1117 | .name = "virtio-mem-device/sanity-checks", | |
1118 | .pre_save = virtio_mem_mig_sanity_checks_pre_save, | |
1119 | .post_load = virtio_mem_mig_sanity_checks_post_load, | |
1120 | .fields = (VMStateField[]) { | |
1121 | VMSTATE_UINT64(addr, VirtIOMEMMigSanityChecks), | |
1122 | VMSTATE_UINT64(region_size, VirtIOMEMMigSanityChecks), | |
1123 | VMSTATE_UINT64(block_size, VirtIOMEMMigSanityChecks), | |
1124 | VMSTATE_UINT32(node, VirtIOMEMMigSanityChecks), | |
1125 | VMSTATE_END_OF_LIST(), | |
1126 | }, | |
1127 | }; | |
1128 | ||
3b95a71b DH |
1129 | static bool virtio_mem_vmstate_field_exists(void *opaque, int version_id) |
1130 | { | |
1131 | const VirtIOMEM *vmem = VIRTIO_MEM(opaque); | |
1132 | ||
1133 | /* With early migration, these fields were already migrated. */ | |
1134 | return !vmem->early_migration; | |
1135 | } | |
1136 | ||
910b2576 DH |
1137 | static const VMStateDescription vmstate_virtio_mem_device = { |
1138 | .name = "virtio-mem-device", | |
1139 | .minimum_version_id = 1, | |
1140 | .version_id = 1, | |
0fd7616e | 1141 | .priority = MIG_PRI_VIRTIO_MEM, |
910b2576 | 1142 | .post_load = virtio_mem_post_load, |
3b95a71b DH |
1143 | .fields = (VMStateField[]) { |
1144 | VMSTATE_WITH_TMP_TEST(VirtIOMEM, virtio_mem_vmstate_field_exists, | |
1145 | VirtIOMEMMigSanityChecks, | |
1146 | vmstate_virtio_mem_sanity_checks), | |
1147 | VMSTATE_UINT64(usable_region_size, VirtIOMEM), | |
1148 | VMSTATE_UINT64_TEST(size, VirtIOMEM, virtio_mem_vmstate_field_exists), | |
1149 | VMSTATE_UINT64(requested_size, VirtIOMEM), | |
1150 | VMSTATE_BITMAP_TEST(bitmap, VirtIOMEM, virtio_mem_vmstate_field_exists, | |
1151 | 0, bitmap_size), | |
1152 | VMSTATE_END_OF_LIST() | |
1153 | }, | |
1154 | }; | |
1155 | ||
1156 | /* | |
1157 | * Transfer properties that are immutable while migration is active early, | |
1158 | * such that we have have this information around before migrating any RAM | |
1159 | * content. | |
1160 | * | |
1161 | * Note that virtio_mem_is_busy() makes sure these properties can no longer | |
1162 | * change on the migration source until migration completed. | |
1163 | * | |
1164 | * With QEMU compat machines, we transmit these properties later, via | |
1165 | * vmstate_virtio_mem_device instead -- see virtio_mem_vmstate_field_exists(). | |
1166 | */ | |
1167 | static const VMStateDescription vmstate_virtio_mem_device_early = { | |
1168 | .name = "virtio-mem-device-early", | |
1169 | .minimum_version_id = 1, | |
1170 | .version_id = 1, | |
1171 | .early_setup = true, | |
d71920d4 | 1172 | .post_load = virtio_mem_post_load_early, |
910b2576 | 1173 | .fields = (VMStateField[]) { |
383ee445 DH |
1174 | VMSTATE_WITH_TMP(VirtIOMEM, VirtIOMEMMigSanityChecks, |
1175 | vmstate_virtio_mem_sanity_checks), | |
910b2576 | 1176 | VMSTATE_UINT64(size, VirtIOMEM), |
910b2576 DH |
1177 | VMSTATE_BITMAP(bitmap, VirtIOMEM, 0, bitmap_size), |
1178 | VMSTATE_END_OF_LIST() | |
1179 | }, | |
1180 | }; | |
1181 | ||
1182 | static const VMStateDescription vmstate_virtio_mem = { | |
1183 | .name = "virtio-mem", | |
1184 | .minimum_version_id = 1, | |
1185 | .version_id = 1, | |
1186 | .fields = (VMStateField[]) { | |
1187 | VMSTATE_VIRTIO_DEVICE, | |
1188 | VMSTATE_END_OF_LIST() | |
1189 | }, | |
1190 | }; | |
1191 | ||
1192 | static void virtio_mem_fill_device_info(const VirtIOMEM *vmem, | |
1193 | VirtioMEMDeviceInfo *vi) | |
1194 | { | |
1195 | vi->memaddr = vmem->addr; | |
1196 | vi->node = vmem->node; | |
1197 | vi->requested_size = vmem->requested_size; | |
1198 | vi->size = vmem->size; | |
1199 | vi->max_size = memory_region_size(&vmem->memdev->mr); | |
1200 | vi->block_size = vmem->block_size; | |
1201 | vi->memdev = object_get_canonical_path(OBJECT(vmem->memdev)); | |
1202 | } | |
1203 | ||
1204 | static MemoryRegion *virtio_mem_get_memory_region(VirtIOMEM *vmem, Error **errp) | |
1205 | { | |
1206 | if (!vmem->memdev) { | |
1207 | error_setg(errp, "'%s' property must be set", VIRTIO_MEM_MEMDEV_PROP); | |
1208 | return NULL; | |
1209 | } | |
1210 | ||
1211 | return &vmem->memdev->mr; | |
1212 | } | |
1213 | ||
c95b4437 DH |
1214 | static void virtio_mem_add_size_change_notifier(VirtIOMEM *vmem, |
1215 | Notifier *notifier) | |
1216 | { | |
1217 | notifier_list_add(&vmem->size_change_notifiers, notifier); | |
1218 | } | |
1219 | ||
1220 | static void virtio_mem_remove_size_change_notifier(VirtIOMEM *vmem, | |
1221 | Notifier *notifier) | |
1222 | { | |
1223 | notifier_remove(notifier); | |
1224 | } | |
1225 | ||
910b2576 DH |
1226 | static void virtio_mem_get_size(Object *obj, Visitor *v, const char *name, |
1227 | void *opaque, Error **errp) | |
1228 | { | |
1229 | const VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
1230 | uint64_t value = vmem->size; | |
1231 | ||
1232 | visit_type_size(v, name, &value, errp); | |
1233 | } | |
1234 | ||
1235 | static void virtio_mem_get_requested_size(Object *obj, Visitor *v, | |
1236 | const char *name, void *opaque, | |
1237 | Error **errp) | |
1238 | { | |
1239 | const VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
1240 | uint64_t value = vmem->requested_size; | |
1241 | ||
1242 | visit_type_size(v, name, &value, errp); | |
1243 | } | |
1244 | ||
1245 | static void virtio_mem_set_requested_size(Object *obj, Visitor *v, | |
1246 | const char *name, void *opaque, | |
1247 | Error **errp) | |
1248 | { | |
1249 | VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
910b2576 DH |
1250 | uint64_t value; |
1251 | ||
d1c81c34 | 1252 | if (!visit_type_size(v, name, &value, errp)) { |
910b2576 DH |
1253 | return; |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * The block size and memory backend are not fixed until the device was | |
1258 | * realized. realize() will verify these properties then. | |
1259 | */ | |
1260 | if (DEVICE(obj)->realized) { | |
1261 | if (!QEMU_IS_ALIGNED(value, vmem->block_size)) { | |
1262 | error_setg(errp, "'%s' has to be multiples of '%s' (0x%" PRIx64 | |
1263 | ")", name, VIRTIO_MEM_BLOCK_SIZE_PROP, | |
1264 | vmem->block_size); | |
1265 | return; | |
1266 | } else if (value > memory_region_size(&vmem->memdev->mr)) { | |
1267 | error_setg(errp, "'%s' cannot exceed the memory backend size" | |
1268 | "(0x%" PRIx64 ")", name, | |
1269 | memory_region_size(&vmem->memdev->mr)); | |
1270 | return; | |
1271 | } | |
1272 | ||
1273 | if (value != vmem->requested_size) { | |
1274 | virtio_mem_resize_usable_region(vmem, value, false); | |
1275 | vmem->requested_size = value; | |
1276 | } | |
1277 | /* | |
1278 | * Trigger a config update so the guest gets notified. We trigger | |
1279 | * even if the size didn't change (especially helpful for debugging). | |
1280 | */ | |
1281 | virtio_notify_config(VIRTIO_DEVICE(vmem)); | |
1282 | } else { | |
1283 | vmem->requested_size = value; | |
1284 | } | |
1285 | } | |
1286 | ||
1287 | static void virtio_mem_get_block_size(Object *obj, Visitor *v, const char *name, | |
1288 | void *opaque, Error **errp) | |
1289 | { | |
1290 | const VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
1291 | uint64_t value = vmem->block_size; | |
1292 | ||
228957fe DH |
1293 | /* |
1294 | * If not configured by the user (and we're not realized yet), use the | |
1295 | * default block size we would use with the current memory backend. | |
1296 | */ | |
1297 | if (!value) { | |
1298 | if (vmem->memdev && memory_region_is_ram(&vmem->memdev->mr)) { | |
1299 | value = virtio_mem_default_block_size(vmem->memdev->mr.ram_block); | |
1300 | } else { | |
1301 | value = virtio_mem_thp_size(); | |
1302 | } | |
1303 | } | |
1304 | ||
910b2576 DH |
1305 | visit_type_size(v, name, &value, errp); |
1306 | } | |
1307 | ||
1308 | static void virtio_mem_set_block_size(Object *obj, Visitor *v, const char *name, | |
1309 | void *opaque, Error **errp) | |
1310 | { | |
1311 | VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
910b2576 DH |
1312 | uint64_t value; |
1313 | ||
1314 | if (DEVICE(obj)->realized) { | |
1315 | error_setg(errp, "'%s' cannot be changed", name); | |
1316 | return; | |
1317 | } | |
1318 | ||
d1c81c34 | 1319 | if (!visit_type_size(v, name, &value, errp)) { |
910b2576 DH |
1320 | return; |
1321 | } | |
1322 | ||
1323 | if (value < VIRTIO_MEM_MIN_BLOCK_SIZE) { | |
1324 | error_setg(errp, "'%s' property has to be at least 0x%" PRIx32, name, | |
1325 | VIRTIO_MEM_MIN_BLOCK_SIZE); | |
1326 | return; | |
1327 | } else if (!is_power_of_2(value)) { | |
1328 | error_setg(errp, "'%s' property has to be a power of two", name); | |
1329 | return; | |
1330 | } | |
1331 | vmem->block_size = value; | |
1332 | } | |
1333 | ||
1334 | static void virtio_mem_instance_init(Object *obj) | |
1335 | { | |
1336 | VirtIOMEM *vmem = VIRTIO_MEM(obj); | |
1337 | ||
c95b4437 | 1338 | notifier_list_init(&vmem->size_change_notifiers); |
2044969f | 1339 | QLIST_INIT(&vmem->rdl_list); |
910b2576 DH |
1340 | |
1341 | object_property_add(obj, VIRTIO_MEM_SIZE_PROP, "size", virtio_mem_get_size, | |
1342 | NULL, NULL, NULL); | |
1343 | object_property_add(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP, "size", | |
1344 | virtio_mem_get_requested_size, | |
1345 | virtio_mem_set_requested_size, NULL, NULL); | |
1346 | object_property_add(obj, VIRTIO_MEM_BLOCK_SIZE_PROP, "size", | |
1347 | virtio_mem_get_block_size, virtio_mem_set_block_size, | |
1348 | NULL, NULL); | |
1349 | } | |
1350 | ||
1351 | static Property virtio_mem_properties[] = { | |
1352 | DEFINE_PROP_UINT64(VIRTIO_MEM_ADDR_PROP, VirtIOMEM, addr, 0), | |
1353 | DEFINE_PROP_UINT32(VIRTIO_MEM_NODE_PROP, VirtIOMEM, node, 0), | |
09b3b7e0 | 1354 | DEFINE_PROP_BOOL(VIRTIO_MEM_PREALLOC_PROP, VirtIOMEM, prealloc, false), |
910b2576 DH |
1355 | DEFINE_PROP_LINK(VIRTIO_MEM_MEMDEV_PROP, VirtIOMEM, memdev, |
1356 | TYPE_MEMORY_BACKEND, HostMemoryBackend *), | |
23ad8dec DH |
1357 | #if defined(VIRTIO_MEM_HAS_LEGACY_GUESTS) |
1358 | DEFINE_PROP_ON_OFF_AUTO(VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP, VirtIOMEM, | |
d5cef025 | 1359 | unplugged_inaccessible, ON_OFF_AUTO_ON), |
23ad8dec | 1360 | #endif |
3b95a71b DH |
1361 | DEFINE_PROP_BOOL(VIRTIO_MEM_EARLY_MIGRATION_PROP, VirtIOMEM, |
1362 | early_migration, true), | |
910b2576 DH |
1363 | DEFINE_PROP_END_OF_LIST(), |
1364 | }; | |
1365 | ||
2044969f DH |
1366 | static uint64_t virtio_mem_rdm_get_min_granularity(const RamDiscardManager *rdm, |
1367 | const MemoryRegion *mr) | |
1368 | { | |
1369 | const VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1370 | ||
1371 | g_assert(mr == &vmem->memdev->mr); | |
1372 | return vmem->block_size; | |
1373 | } | |
1374 | ||
1375 | static bool virtio_mem_rdm_is_populated(const RamDiscardManager *rdm, | |
1376 | const MemoryRegionSection *s) | |
1377 | { | |
1378 | const VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1379 | uint64_t start_gpa = vmem->addr + s->offset_within_region; | |
1380 | uint64_t end_gpa = start_gpa + int128_get64(s->size); | |
1381 | ||
1382 | g_assert(s->mr == &vmem->memdev->mr); | |
1383 | ||
1384 | start_gpa = QEMU_ALIGN_DOWN(start_gpa, vmem->block_size); | |
1385 | end_gpa = QEMU_ALIGN_UP(end_gpa, vmem->block_size); | |
1386 | ||
1387 | if (!virtio_mem_valid_range(vmem, start_gpa, end_gpa - start_gpa)) { | |
1388 | return false; | |
1389 | } | |
1390 | ||
25c89303 | 1391 | return virtio_mem_is_range_plugged(vmem, start_gpa, end_gpa - start_gpa); |
2044969f DH |
1392 | } |
1393 | ||
1394 | struct VirtIOMEMReplayData { | |
1395 | void *fn; | |
1396 | void *opaque; | |
1397 | }; | |
1398 | ||
1399 | static int virtio_mem_rdm_replay_populated_cb(MemoryRegionSection *s, void *arg) | |
1400 | { | |
1401 | struct VirtIOMEMReplayData *data = arg; | |
1402 | ||
1403 | return ((ReplayRamPopulate)data->fn)(s, data->opaque); | |
1404 | } | |
1405 | ||
1406 | static int virtio_mem_rdm_replay_populated(const RamDiscardManager *rdm, | |
1407 | MemoryRegionSection *s, | |
1408 | ReplayRamPopulate replay_fn, | |
1409 | void *opaque) | |
1410 | { | |
1411 | const VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1412 | struct VirtIOMEMReplayData data = { | |
1413 | .fn = replay_fn, | |
1414 | .opaque = opaque, | |
1415 | }; | |
1416 | ||
1417 | g_assert(s->mr == &vmem->memdev->mr); | |
1418 | return virtio_mem_for_each_plugged_section(vmem, s, &data, | |
1419 | virtio_mem_rdm_replay_populated_cb); | |
1420 | } | |
1421 | ||
372aa6fd DH |
1422 | static int virtio_mem_rdm_replay_discarded_cb(MemoryRegionSection *s, |
1423 | void *arg) | |
1424 | { | |
1425 | struct VirtIOMEMReplayData *data = arg; | |
1426 | ||
1427 | ((ReplayRamDiscard)data->fn)(s, data->opaque); | |
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | static void virtio_mem_rdm_replay_discarded(const RamDiscardManager *rdm, | |
1432 | MemoryRegionSection *s, | |
1433 | ReplayRamDiscard replay_fn, | |
1434 | void *opaque) | |
1435 | { | |
1436 | const VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1437 | struct VirtIOMEMReplayData data = { | |
1438 | .fn = replay_fn, | |
1439 | .opaque = opaque, | |
1440 | }; | |
1441 | ||
1442 | g_assert(s->mr == &vmem->memdev->mr); | |
1443 | virtio_mem_for_each_unplugged_section(vmem, s, &data, | |
1444 | virtio_mem_rdm_replay_discarded_cb); | |
1445 | } | |
1446 | ||
2044969f DH |
1447 | static void virtio_mem_rdm_register_listener(RamDiscardManager *rdm, |
1448 | RamDiscardListener *rdl, | |
1449 | MemoryRegionSection *s) | |
1450 | { | |
1451 | VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1452 | int ret; | |
1453 | ||
1454 | g_assert(s->mr == &vmem->memdev->mr); | |
1455 | rdl->section = memory_region_section_new_copy(s); | |
1456 | ||
1457 | QLIST_INSERT_HEAD(&vmem->rdl_list, rdl, next); | |
1458 | ret = virtio_mem_for_each_plugged_section(vmem, rdl->section, rdl, | |
1459 | virtio_mem_notify_populate_cb); | |
1460 | if (ret) { | |
1461 | error_report("%s: Replaying plugged ranges failed: %s", __func__, | |
1462 | strerror(-ret)); | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | static void virtio_mem_rdm_unregister_listener(RamDiscardManager *rdm, | |
1467 | RamDiscardListener *rdl) | |
1468 | { | |
1469 | VirtIOMEM *vmem = VIRTIO_MEM(rdm); | |
1470 | ||
1471 | g_assert(rdl->section->mr == &vmem->memdev->mr); | |
1472 | if (vmem->size) { | |
1473 | if (rdl->double_discard_supported) { | |
1474 | rdl->notify_discard(rdl, rdl->section); | |
1475 | } else { | |
1476 | virtio_mem_for_each_plugged_section(vmem, rdl->section, rdl, | |
1477 | virtio_mem_notify_discard_cb); | |
1478 | } | |
1479 | } | |
1480 | ||
1481 | memory_region_section_free_copy(rdl->section); | |
1482 | rdl->section = NULL; | |
1483 | QLIST_REMOVE(rdl, next); | |
1484 | } | |
1485 | ||
910b2576 DH |
1486 | static void virtio_mem_class_init(ObjectClass *klass, void *data) |
1487 | { | |
1488 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1489 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
1490 | VirtIOMEMClass *vmc = VIRTIO_MEM_CLASS(klass); | |
2044969f | 1491 | RamDiscardManagerClass *rdmc = RAM_DISCARD_MANAGER_CLASS(klass); |
910b2576 DH |
1492 | |
1493 | device_class_set_props(dc, virtio_mem_properties); | |
1494 | dc->vmsd = &vmstate_virtio_mem; | |
1495 | ||
1496 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); | |
1497 | vdc->realize = virtio_mem_device_realize; | |
1498 | vdc->unrealize = virtio_mem_device_unrealize; | |
1499 | vdc->get_config = virtio_mem_get_config; | |
1500 | vdc->get_features = virtio_mem_get_features; | |
23ad8dec | 1501 | vdc->validate_features = virtio_mem_validate_features; |
910b2576 DH |
1502 | vdc->vmsd = &vmstate_virtio_mem_device; |
1503 | ||
1504 | vmc->fill_device_info = virtio_mem_fill_device_info; | |
1505 | vmc->get_memory_region = virtio_mem_get_memory_region; | |
c95b4437 DH |
1506 | vmc->add_size_change_notifier = virtio_mem_add_size_change_notifier; |
1507 | vmc->remove_size_change_notifier = virtio_mem_remove_size_change_notifier; | |
2044969f DH |
1508 | |
1509 | rdmc->get_min_granularity = virtio_mem_rdm_get_min_granularity; | |
1510 | rdmc->is_populated = virtio_mem_rdm_is_populated; | |
1511 | rdmc->replay_populated = virtio_mem_rdm_replay_populated; | |
372aa6fd | 1512 | rdmc->replay_discarded = virtio_mem_rdm_replay_discarded; |
2044969f DH |
1513 | rdmc->register_listener = virtio_mem_rdm_register_listener; |
1514 | rdmc->unregister_listener = virtio_mem_rdm_unregister_listener; | |
910b2576 DH |
1515 | } |
1516 | ||
1517 | static const TypeInfo virtio_mem_info = { | |
1518 | .name = TYPE_VIRTIO_MEM, | |
1519 | .parent = TYPE_VIRTIO_DEVICE, | |
1520 | .instance_size = sizeof(VirtIOMEM), | |
1521 | .instance_init = virtio_mem_instance_init, | |
1522 | .class_init = virtio_mem_class_init, | |
1523 | .class_size = sizeof(VirtIOMEMClass), | |
2044969f DH |
1524 | .interfaces = (InterfaceInfo[]) { |
1525 | { TYPE_RAM_DISCARD_MANAGER }, | |
1526 | { } | |
1527 | }, | |
910b2576 DH |
1528 | }; |
1529 | ||
1530 | static void virtio_register_types(void) | |
1531 | { | |
1532 | type_register_static(&virtio_mem_info); | |
1533 | } | |
1534 | ||
1535 | type_init(virtio_register_types) |