| 1 | /* |
| 2 | * QEMU Hyper-V Dynamic Memory Protocol driver |
| 3 | * |
| 4 | * Copyright (C) 2020-2023 Oracle and/or its affiliates. |
| 5 | * |
| 6 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 7 | * See the COPYING file in the top-level directory. |
| 8 | */ |
| 9 | |
| 10 | #include "qemu/osdep.h" |
| 11 | #include "hv-balloon-internal.h" |
| 12 | |
| 13 | #include "system/address-spaces.h" |
| 14 | #include "exec/cpu-common.h" |
| 15 | #include "system/ramblock.h" |
| 16 | #include "hw/core/boards.h" |
| 17 | #include "hw/hyperv/dynmem-proto.h" |
| 18 | #include "hw/hyperv/hv-balloon.h" |
| 19 | #include "hw/hyperv/vmbus.h" |
| 20 | #include "hw/mem/memory-device.h" |
| 21 | #include "hw/mem/pc-dimm.h" |
| 22 | #include "hw/core/qdev.h" |
| 23 | #include "hw/core/qdev-properties.h" |
| 24 | #include "monitor/qdev.h" |
| 25 | #include "qapi/error.h" |
| 26 | #include "qapi/qapi-commands-machine.h" |
| 27 | #include "qapi/qapi-events-machine.h" |
| 28 | #include "qapi/qapi-types-machine.h" |
| 29 | #include "qobject/qdict.h" |
| 30 | #include "qapi/visitor.h" |
| 31 | #include "qemu/error-report.h" |
| 32 | #include "qemu/module.h" |
| 33 | #include "qemu/units.h" |
| 34 | #include "qemu/timer.h" |
| 35 | #include "system/balloon.h" |
| 36 | #include "system/hostmem.h" |
| 37 | #include "system/reset.h" |
| 38 | #include "hv-balloon-our_range_memslots.h" |
| 39 | #include "hv-balloon-page_range_tree.h" |
| 40 | #include "trace.h" |
| 41 | |
| 42 | #define HV_BALLOON_ADDR_PROP "addr" |
| 43 | #define HV_BALLOON_MEMDEV_PROP "memdev" |
| 44 | #define HV_BALLOON_GUID "525074DC-8985-46e2-8057-A307DC18A502" |
| 45 | |
| 46 | /* |
| 47 | * Some Windows versions (at least Server 2019) will crash with various |
| 48 | * error codes when receiving DM protocol requests (at least |
| 49 | * DM_MEM_HOT_ADD_REQUEST) immediately after boot. |
| 50 | * |
| 51 | * It looks like Hyper-V from Server 2016 uses a 50-second after-boot |
| 52 | * delay, probably to workaround this issue, so we'll use this value, too. |
| 53 | */ |
| 54 | #define HV_BALLOON_POST_INIT_WAIT (50 * 1000) |
| 55 | |
| 56 | #define HV_BALLOON_HA_CHUNK_SIZE (2 * GiB) |
| 57 | #define HV_BALLOON_HA_CHUNK_PAGES (HV_BALLOON_HA_CHUNK_SIZE / HV_BALLOON_PAGE_SIZE) |
| 58 | |
| 59 | #define HV_BALLOON_HA_MEMSLOT_SIZE_ALIGN (128 * MiB) |
| 60 | |
| 61 | #define HV_BALLOON_HR_CHUNK_PAGES 585728 |
| 62 | /* |
| 63 | * ^ that's the maximum number of pages |
| 64 | * that Windows returns in one hot remove response |
| 65 | * |
| 66 | * If the number requested is too high Windows will no longer honor |
| 67 | * these requests |
| 68 | */ |
| 69 | |
| 70 | typedef enum State { |
| 71 | /* not a real state */ |
| 72 | S_NO_CHANGE = 0, |
| 73 | |
| 74 | S_WAIT_RESET, |
| 75 | S_POST_RESET_CLOSED, |
| 76 | |
| 77 | /* init flow */ |
| 78 | S_VERSION, |
| 79 | S_CAPS, |
| 80 | S_POST_INIT_WAIT, |
| 81 | |
| 82 | S_IDLE, |
| 83 | |
| 84 | /* balloon op flow */ |
| 85 | S_BALLOON_POSTING, |
| 86 | S_BALLOON_RB_WAIT, |
| 87 | S_BALLOON_REPLY_WAIT, |
| 88 | |
| 89 | /* unballoon + hot add ops flow */ |
| 90 | S_UNBALLOON_POSTING, |
| 91 | S_UNBALLOON_RB_WAIT, |
| 92 | S_UNBALLOON_REPLY_WAIT, |
| 93 | S_HOT_ADD_SETUP, |
| 94 | S_HOT_ADD_RB_WAIT, |
| 95 | S_HOT_ADD_POSTING, |
| 96 | S_HOT_ADD_REPLY_WAIT, |
| 97 | } State; |
| 98 | |
| 99 | typedef struct StateDesc { |
| 100 | State state; |
| 101 | const char *desc; |
| 102 | } StateDesc; |
| 103 | |
| 104 | typedef struct HvBalloon { |
| 105 | VMBusDevice parent; |
| 106 | State state; |
| 107 | |
| 108 | union dm_version version; |
| 109 | union dm_caps caps; |
| 110 | |
| 111 | QEMUTimer post_init_timer; |
| 112 | |
| 113 | unsigned int trans_id; |
| 114 | |
| 115 | struct { |
| 116 | bool enabled; |
| 117 | bool received; |
| 118 | uint64_t committed; |
| 119 | uint64_t available; |
| 120 | } status_report; |
| 121 | |
| 122 | /* Guest target size */ |
| 123 | uint64_t target; |
| 124 | bool target_changed; |
| 125 | |
| 126 | /* Current (un)balloon / hot-add operation parameters */ |
| 127 | union { |
| 128 | uint64_t balloon_diff; |
| 129 | |
| 130 | struct { |
| 131 | uint64_t unballoon_diff; |
| 132 | uint64_t hot_add_diff; |
| 133 | }; |
| 134 | |
| 135 | struct { |
| 136 | PageRange hot_add_range; |
| 137 | uint64_t ha_current_count; |
| 138 | }; |
| 139 | }; |
| 140 | |
| 141 | OurRangeMemslots *our_range; |
| 142 | |
| 143 | /* Count of memslots covering our memory */ |
| 144 | unsigned int memslot_count; |
| 145 | |
| 146 | /* Nominal size of each memslot (the last one might be smaller) */ |
| 147 | uint64_t memslot_size; |
| 148 | |
| 149 | /* Non-ours removed memory */ |
| 150 | PageRangeTree removed_guest, removed_both; |
| 151 | |
| 152 | /* Grand totals of removed memory (both ours and non-ours) */ |
| 153 | uint64_t removed_guest_ctr, removed_both_ctr; |
| 154 | |
| 155 | /* MEMORY_DEVICE props */ |
| 156 | uint64_t addr; |
| 157 | HostMemoryBackend *hostmem; |
| 158 | MemoryRegion *mr; |
| 159 | } HvBalloon; |
| 160 | |
| 161 | OBJECT_DEFINE_SIMPLE_TYPE_WITH_INTERFACES(HvBalloon, hv_balloon, \ |
| 162 | HV_BALLOON, VMBUS_DEVICE, \ |
| 163 | { TYPE_MEMORY_DEVICE }, { }) |
| 164 | |
| 165 | #define HV_BALLOON_SET_STATE(hvb, news) \ |
| 166 | do { \ |
| 167 | assert(news != S_NO_CHANGE); \ |
| 168 | hv_balloon_state_set(hvb, news, # news); \ |
| 169 | } while (0) |
| 170 | |
| 171 | #define HV_BALLOON_STATE_DESC_SET(stdesc, news) \ |
| 172 | _hv_balloon_state_desc_set(stdesc, news, # news) |
| 173 | |
| 174 | #define HV_BALLOON_STATE_DESC_INIT \ |
| 175 | { \ |
| 176 | .state = S_NO_CHANGE, \ |
| 177 | } |
| 178 | |
| 179 | typedef struct HvBalloonReq { |
| 180 | VMBusChanReq vmreq; |
| 181 | } HvBalloonReq; |
| 182 | |
| 183 | /* total our memory includes parts currently removed from the guest */ |
| 184 | static uint64_t hv_balloon_total_our_ram(HvBalloon *balloon) |
| 185 | { |
| 186 | if (!balloon->our_range) { |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | return balloon->our_range->range.added; |
| 191 | } |
| 192 | |
| 193 | /* TODO: unify the code below with virtio-balloon and cache the value */ |
| 194 | static int build_dimm_list(Object *obj, void *opaque) |
| 195 | { |
| 196 | GSList **list = opaque; |
| 197 | |
| 198 | if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { |
| 199 | DeviceState *dev = DEVICE(obj); |
| 200 | if (qdev_is_realized(dev)) { /* only realized DIMMs matter */ |
| 201 | *list = g_slist_prepend(*list, dev); |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | object_child_foreach(obj, build_dimm_list, opaque); |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static ram_addr_t get_current_ram_size(void) |
| 210 | { |
| 211 | GSList *list = NULL, *item; |
| 212 | ram_addr_t size = current_machine->ram_size; |
| 213 | |
| 214 | build_dimm_list(qdev_get_machine(), &list); |
| 215 | for (item = list; item; item = g_slist_next(item)) { |
| 216 | Object *obj = OBJECT(item->data); |
| 217 | if (!strcmp(object_get_typename(obj), TYPE_PC_DIMM)) |
| 218 | size += object_property_get_int(obj, PC_DIMM_SIZE_PROP, |
| 219 | &error_abort); |
| 220 | } |
| 221 | g_slist_free(list); |
| 222 | |
| 223 | return size; |
| 224 | } |
| 225 | |
| 226 | /* total RAM includes memory currently removed from the guest */ |
| 227 | static uint64_t hv_balloon_total_ram(HvBalloon *balloon) |
| 228 | { |
| 229 | ram_addr_t ram_size = get_current_ram_size(); |
| 230 | uint64_t ram_size_pages = ram_size >> HV_BALLOON_PFN_SHIFT; |
| 231 | uint64_t our_ram_size_pages = hv_balloon_total_our_ram(balloon); |
| 232 | |
| 233 | assert(ram_size_pages > 0); |
| 234 | |
| 235 | return SUM_SATURATE_U64(ram_size_pages, our_ram_size_pages); |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * calculating the total RAM size is a slow operation, |
| 240 | * avoid it as much as possible |
| 241 | */ |
| 242 | static uint64_t hv_balloon_total_removed_rs(HvBalloon *balloon, |
| 243 | uint64_t ram_size_pages) |
| 244 | { |
| 245 | uint64_t total_removed; |
| 246 | |
| 247 | total_removed = SUM_SATURATE_U64(balloon->removed_guest_ctr, |
| 248 | balloon->removed_both_ctr); |
| 249 | |
| 250 | /* possible if guest returns pages outside actual RAM */ |
| 251 | if (total_removed > ram_size_pages) { |
| 252 | total_removed = ram_size_pages; |
| 253 | } |
| 254 | |
| 255 | return total_removed; |
| 256 | } |
| 257 | |
| 258 | /* Returns whether the state has actually changed */ |
| 259 | static bool hv_balloon_state_set(HvBalloon *balloon, |
| 260 | State newst, const char *newststr) |
| 261 | { |
| 262 | if (newst == S_NO_CHANGE || balloon->state == newst) { |
| 263 | return false; |
| 264 | } |
| 265 | |
| 266 | balloon->state = newst; |
| 267 | trace_hv_balloon_state_change(newststr); |
| 268 | return true; |
| 269 | } |
| 270 | |
| 271 | static void _hv_balloon_state_desc_set(StateDesc *stdesc, |
| 272 | State newst, const char *newststr) |
| 273 | { |
| 274 | /* state setting is only permitted on a freshly init desc */ |
| 275 | assert(stdesc->state == S_NO_CHANGE); |
| 276 | |
| 277 | assert(newst != S_NO_CHANGE); |
| 278 | |
| 279 | stdesc->state = newst; |
| 280 | stdesc->desc = newststr; |
| 281 | } |
| 282 | |
| 283 | static VMBusChannel *hv_balloon_get_channel_maybe(HvBalloon *balloon) |
| 284 | { |
| 285 | return vmbus_device_channel(&balloon->parent, 0); |
| 286 | } |
| 287 | |
| 288 | static VMBusChannel *hv_balloon_get_channel(HvBalloon *balloon) |
| 289 | { |
| 290 | VMBusChannel *chan; |
| 291 | |
| 292 | chan = hv_balloon_get_channel_maybe(balloon); |
| 293 | assert(chan != NULL); |
| 294 | return chan; |
| 295 | } |
| 296 | |
| 297 | static ssize_t hv_balloon_send_packet(VMBusChannel *chan, |
| 298 | struct dm_message *msg) |
| 299 | { |
| 300 | int ret; |
| 301 | |
| 302 | ret = vmbus_channel_reserve(chan, 0, msg->hdr.size); |
| 303 | if (ret < 0) { |
| 304 | return ret; |
| 305 | } |
| 306 | |
| 307 | return vmbus_channel_send(chan, VMBUS_PACKET_DATA_INBAND, |
| 308 | NULL, 0, msg, msg->hdr.size, false, |
| 309 | msg->hdr.trans_id); |
| 310 | } |
| 311 | |
| 312 | static bool hv_balloon_unballoon_get_source(HvBalloon *balloon, |
| 313 | PageRangeTree *dtree, |
| 314 | uint64_t **dctr, |
| 315 | bool *is_our_range) |
| 316 | { |
| 317 | OurRange *our_range = OUR_RANGE(balloon->our_range); |
| 318 | |
| 319 | /* Try the boot memory first */ |
| 320 | if (g_tree_nnodes(balloon->removed_guest.t) > 0) { |
| 321 | *dtree = balloon->removed_guest; |
| 322 | *dctr = &balloon->removed_guest_ctr; |
| 323 | *is_our_range = false; |
| 324 | } else if (g_tree_nnodes(balloon->removed_both.t) > 0) { |
| 325 | *dtree = balloon->removed_both; |
| 326 | *dctr = &balloon->removed_both_ctr; |
| 327 | *is_our_range = false; |
| 328 | } else if (!our_range) { |
| 329 | return false; |
| 330 | } else if (!our_range_is_removed_tree_empty(our_range, false)) { |
| 331 | *dtree = our_range_get_removed_tree(our_range, false); |
| 332 | *dctr = &balloon->removed_guest_ctr; |
| 333 | *is_our_range = true; |
| 334 | } else if (!our_range_is_removed_tree_empty(our_range, true)) { |
| 335 | *dtree = our_range_get_removed_tree(our_range, true); |
| 336 | *dctr = &balloon->removed_both_ctr; |
| 337 | *is_our_range = true; |
| 338 | } else { |
| 339 | return false; |
| 340 | } |
| 341 | |
| 342 | return true; |
| 343 | } |
| 344 | |
| 345 | static void hv_balloon_unballoon_rb_wait(HvBalloon *balloon, StateDesc *stdesc) |
| 346 | { |
| 347 | VMBusChannel *chan = hv_balloon_get_channel(balloon); |
| 348 | struct dm_unballoon_request *ur; |
| 349 | size_t ur_size = sizeof(*ur) + sizeof(ur->range_array[0]); |
| 350 | |
| 351 | assert(balloon->state == S_UNBALLOON_RB_WAIT); |
| 352 | |
| 353 | if (vmbus_channel_reserve(chan, 0, ur_size) < 0) { |
| 354 | return; |
| 355 | } |
| 356 | |
| 357 | HV_BALLOON_STATE_DESC_SET(stdesc, S_UNBALLOON_POSTING); |
| 358 | } |
| 359 | |
| 360 | static void hv_balloon_unballoon_posting(HvBalloon *balloon, StateDesc *stdesc) |
| 361 | { |
| 362 | VMBusChannel *chan = hv_balloon_get_channel(balloon); |
| 363 | PageRangeTree dtree; |
| 364 | uint64_t *dctr; |
| 365 | bool our_range; |
| 366 | g_autofree struct dm_unballoon_request *ur = NULL; |
| 367 | size_t ur_size = sizeof(*ur) + sizeof(ur->range_array[0]); |
| 368 | PageRange range; |
| 369 | bool bret; |
| 370 | ssize_t ret; |
| 371 | |
| 372 | assert(balloon->state == S_UNBALLOON_POSTING); |
| 373 | assert(balloon->unballoon_diff > 0); |
| 374 | |
| 375 | if (!hv_balloon_unballoon_get_source(balloon, &dtree, &dctr, &our_range)) { |
| 376 | error_report("trying to unballoon but nothing seems to be ballooned"); |
| 377 | /* |
| 378 | * there is little we can do as we might have already |
| 379 | * sent the guest a partial request we can't cancel |
| 380 | */ |
| 381 | return; |
| 382 | } |
| 383 | |
| 384 | assert(balloon->our_range || !our_range); |
| 385 | assert(dtree.t); |
| 386 | assert(dctr); |
| 387 | |
| 388 | ur = g_malloc0(ur_size); |
| 389 | ur->hdr.type = DM_UNBALLOON_REQUEST; |
| 390 | ur->hdr.size = ur_size; |
| 391 | ur->hdr.trans_id = balloon->trans_id; |
| 392 | |
| 393 | bret = hvb_page_range_tree_pop(dtree, &range, MIN(balloon->unballoon_diff, |
| 394 | HV_BALLOON_HA_CHUNK_PAGES)); |
| 395 | assert(bret); |
| 396 | /* TODO: madvise? */ |
| 397 | |
| 398 | *dctr -= range.count; |
| 399 | balloon->unballoon_diff -= range.count; |
| 400 | |
| 401 | ur->range_count = 1; |
| 402 | ur->range_array[0].finfo.start_page = range.start; |
| 403 | ur->range_array[0].finfo.page_cnt = range.count; |
| 404 | ur->more_pages = balloon->unballoon_diff > 0; |
| 405 | |
| 406 | trace_hv_balloon_outgoing_unballoon(ur->hdr.trans_id, |
| 407 | range.count, range.start, |
| 408 | balloon->unballoon_diff); |
| 409 | |
| 410 | if (ur->more_pages) { |
| 411 | HV_BALLOON_STATE_DESC_SET(stdesc, S_UNBALLOON_RB_WAIT); |
| 412 | } else { |
| 413 | HV_BALLOON_STATE_DESC_SET(stdesc, S_UNBALLOON_REPLY_WAIT); |
| 414 | } |
| 415 | |
| 416 | ret = vmbus_channel_send(chan, VMBUS_PACKET_DATA_INBAND, |
| 417 | NULL, 0, ur, ur_size, false, |
| 418 | ur->hdr.trans_id); |
| 419 | if (ret <= 0) { |
| 420 | error_report("error %zd when posting unballoon msg, expect problems", |
| 421 | ret); |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | static bool hv_balloon_our_range_ensure(HvBalloon *balloon) |
| 426 | { |
| 427 | uint64_t align; |
| 428 | MemoryRegion *hostmem_mr; |
| 429 | g_autoptr(OurRangeMemslots) our_range_memslots = NULL; |
| 430 | OurRange *our_range; |
| 431 | |
| 432 | if (balloon->our_range) { |
| 433 | return true; |
| 434 | } |
| 435 | |
| 436 | if (!balloon->hostmem) { |
| 437 | return false; |
| 438 | } |
| 439 | |
| 440 | align = (1 << balloon->caps.cap_bits.hot_add_alignment) * MiB; |
| 441 | assert(QEMU_IS_ALIGNED(balloon->addr, align)); |
| 442 | |
| 443 | hostmem_mr = host_memory_backend_get_memory(balloon->hostmem); |
| 444 | |
| 445 | our_range_memslots = hvb_our_range_memslots_new(balloon->addr, |
| 446 | balloon->mr, hostmem_mr, |
| 447 | OBJECT(balloon), |
| 448 | balloon->memslot_count, |
| 449 | balloon->memslot_size); |
| 450 | our_range = OUR_RANGE(our_range_memslots); |
| 451 | |
| 452 | if (hvb_page_range_tree_intree_any(balloon->removed_guest, |
| 453 | our_range->range.start, |
| 454 | our_range->range.count) || |
| 455 | hvb_page_range_tree_intree_any(balloon->removed_both, |
| 456 | our_range->range.start, |
| 457 | our_range->range.count)) { |
| 458 | error_report("some parts of the memory backend were already returned by the guest. this should not happen, please reboot the guest and try again"); |
| 459 | return false; |
| 460 | } |
| 461 | |
| 462 | trace_hv_balloon_our_range_add(our_range->range.count, |
| 463 | our_range->range.start); |
| 464 | |
| 465 | balloon->our_range = g_steal_pointer(&our_range_memslots); |
| 466 | return true; |
| 467 | } |
| 468 | |
| 469 | static void hv_balloon_hot_add_setup(HvBalloon *balloon, StateDesc *stdesc) |
| 470 | { |
| 471 | /* need to make copy since it is in union with hot_add_range */ |
| 472 | uint64_t hot_add_diff = balloon->hot_add_diff; |
| 473 | PageRange *hot_add_range = &balloon->hot_add_range; |
| 474 | uint64_t align, our_range_remaining; |
| 475 | OurRange *our_range; |
| 476 | |
| 477 | assert(balloon->state == S_HOT_ADD_SETUP); |
| 478 | assert(hot_add_diff > 0); |
| 479 | |
| 480 | if (!hv_balloon_our_range_ensure(balloon)) { |
| 481 | goto ret_idle; |
| 482 | } |
| 483 | |
| 484 | our_range = OUR_RANGE(balloon->our_range); |
| 485 | |
| 486 | align = (1 << balloon->caps.cap_bits.hot_add_alignment) * |
| 487 | (MiB / HV_BALLOON_PAGE_SIZE); |
| 488 | |
| 489 | /* Absolute GPA in pages */ |
| 490 | hot_add_range->start = our_range_get_remaining_start(our_range); |
| 491 | assert(QEMU_IS_ALIGNED(hot_add_range->start, align)); |
| 492 | |
| 493 | our_range_remaining = our_range_get_remaining_size(our_range); |
| 494 | hot_add_range->count = MIN(our_range_remaining, hot_add_diff); |
| 495 | hot_add_range->count = QEMU_ALIGN_DOWN(hot_add_range->count, align); |
| 496 | if (hot_add_range->count == 0) { |
| 497 | goto ret_idle; |
| 498 | } |
| 499 | |
| 500 | hvb_our_range_memslots_ensure_mapped_additional(balloon->our_range, |
| 501 | hot_add_range->count); |
| 502 | |
| 503 | HV_BALLOON_STATE_DESC_SET(stdesc, S_HOT_ADD_RB_WAIT); |
| 504 | return; |
| 505 | |
| 506 | ret_idle: |
| 507 | HV_BALLOON_STATE_DESC_SET(stdesc, S_IDLE); |
| 508 | } |
| 509 | |
| 510 | static void hv_balloon_hot_add_rb_wait(HvBalloon *balloon, StateDesc *stdesc) |
| 511 | { |
| 512 | VMBusChannel *chan = hv_balloon_get_channel(balloon); |
| 513 | struct dm_hot_add_with_region *ha; |
| 514 | size_t ha_size = sizeof(*ha); |
| 515 | |
| 516 | assert(balloon->state == S_HOT_ADD_RB_WAIT); |
| 517 | |
| 518 | if (vmbus_channel_reserve(chan, 0, ha_size) < 0) { |
| 519 | return; |
| 520 | } |
| 521 | |
| 522 | HV_BALLOON_STATE_DESC_SET(stdesc, S_HOT_ADD_POSTING); |
| 523 | } |
| 524 | |
| 525 | static void hv_balloon_hot_add_posting(HvBalloon *balloon, StateDesc *stdesc) |
| 526 | { |
| 527 | PageRange *hot_add_range = &balloon->hot_add_range; |
| 528 | uint64_t *current_count = &balloon->ha_current_count; |
| 529 | VMBusChannel *chan = hv_balloon_get_channel(balloon); |
| 530 | g_autofree struct dm_hot_add_with_region *ha = NULL; |
| 531 | size_t ha_size = sizeof(*ha); |
| 532 | union dm_mem_page_range *ha_region; |
| 533 | uint64_t align, chunk_max_size; |
| 534 | ssize_t ret; |
| 535 | |
| 536 | assert(balloon->state == S_HOT_ADD_POSTING); |
| 537 | assert(hot_add_range->count > 0); |
| 538 | |
| 539 | align = (1 << balloon->caps.cap_bits.hot_add_alignment) * |
| 540 | (MiB / HV_BALLOON_PAGE_SIZE); |
| 541 | if (align >= HV_BALLOON_HA_CHUNK_PAGES) { |
| 542 | /* |
| 543 | * If the required alignment is higher than the chunk size we let it |
| 544 | * override that size. |
| 545 | */ |
| 546 | chunk_max_size = align; |
| 547 | } else { |
| 548 | chunk_max_size = QEMU_ALIGN_DOWN(HV_BALLOON_HA_CHUNK_PAGES, align); |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * hot_add_range->count starts aligned in hv_balloon_hot_add_setup(), |
| 553 | * then it is either reduced by subtracting aligned current_count or |
| 554 | * further hot-adds are prevented by marking the whole remaining our range |
| 555 | * as unusable in hv_balloon_handle_hot_add_response(). |
| 556 | */ |
| 557 | *current_count = MIN(hot_add_range->count, chunk_max_size); |
| 558 | |
| 559 | ha = g_malloc0(ha_size); |
| 560 | ha_region = &ha->region; |
| 561 | ha->hdr.type = DM_MEM_HOT_ADD_REQUEST; |
| 562 | ha->hdr.size = ha_size; |
| 563 | ha->hdr.trans_id = balloon->trans_id; |
| 564 | |
| 565 | ha->range.finfo.start_page = hot_add_range->start; |
| 566 | ha->range.finfo.page_cnt = *current_count; |
| 567 | ha_region->finfo.start_page = hot_add_range->start; |
| 568 | ha_region->finfo.page_cnt = ha->range.finfo.page_cnt; |
| 569 | |
| 570 | trace_hv_balloon_outgoing_hot_add(ha->hdr.trans_id, |
| 571 | *current_count, hot_add_range->start); |
| 572 | |
| 573 | ret = vmbus_channel_send(chan, VMBUS_PACKET_DATA_INBAND, |
| 574 | NULL, 0, ha, ha_size, false, |
| 575 | ha->hdr.trans_id); |
| 576 | if (ret <= 0) { |
| 577 | error_report("error %zd when posting hot add msg, expect problems", |
| 578 | ret); |
| 579 | } |
| 580 | |
| 581 | HV_BALLOON_STATE_DESC_SET(stdesc, S_HOT_ADD_REPLY_WAIT); |
| 582 | } |
| 583 | |
| 584 | static void hv_balloon_balloon_rb_wait(HvBalloon *balloon, StateDesc *stdesc) |
| 585 | { |
| 586 | VMBusChannel *chan = hv_balloon_get_channel(balloon); |
| 587 | size_t bl_size = sizeof(struct dm_balloon); |
| 588 | |
| 589 | assert(balloon->state == S_BALLOON_RB_WAIT); |
| 590 | |
| 591 | if (vmbus_channel_reserve(chan, 0, bl_size) < 0) { |
| 592 | return; |
| 593 | } |
| 594 | |
| 595 | HV_BALLOON_STATE_DESC_SET(stdesc, S_BALLOON_POSTING); |
| 596 | } |
| 597 | |
| 598 | static void hv_balloon_balloon_posting(HvBalloon *balloon, StateDesc *stdesc) |
| 599 | { |
| 600 | VMBusChannel *chan = hv_balloon_get_channel(balloon); |
| 601 | struct dm_balloon bl; |
| 602 | size_t bl_size = sizeof(bl); |
| 603 | ssize_t ret; |
| 604 | |
| 605 | assert(balloon->state == S_BALLOON_POSTING); |
| 606 | assert(balloon->balloon_diff > 0); |
| 607 | |
| 608 | memset(&bl, 0, sizeof(bl)); |
| 609 | bl.hdr.type = DM_BALLOON_REQUEST; |
| 610 | bl.hdr.size = bl_size; |
| 611 | bl.hdr.trans_id = balloon->trans_id; |
| 612 | bl.num_pages = MIN(balloon->balloon_diff, HV_BALLOON_HR_CHUNK_PAGES); |
| 613 | |
| 614 | trace_hv_balloon_outgoing_balloon(bl.hdr.trans_id, bl.num_pages, |
| 615 | balloon->balloon_diff); |
| 616 | |
| 617 | ret = vmbus_channel_send(chan, VMBUS_PACKET_DATA_INBAND, |
| 618 | NULL, 0, &bl, bl_size, false, |
| 619 | bl.hdr.trans_id); |
| 620 | if (ret <= 0) { |
| 621 | error_report("error %zd when posting balloon msg, expect problems", |
| 622 | ret); |
| 623 | } |
| 624 | |
| 625 | HV_BALLOON_STATE_DESC_SET(stdesc, S_BALLOON_REPLY_WAIT); |
| 626 | } |
| 627 | |
| 628 | static void hv_balloon_idle_state_process_target(HvBalloon *balloon, |
| 629 | StateDesc *stdesc) |
| 630 | { |
| 631 | bool can_balloon = balloon->caps.cap_bits.balloon; |
| 632 | uint64_t ram_size_pages, total_removed; |
| 633 | |
| 634 | ram_size_pages = hv_balloon_total_ram(balloon); |
| 635 | total_removed = hv_balloon_total_removed_rs(balloon, ram_size_pages); |
| 636 | |
| 637 | /* |
| 638 | * we need to cache the values computed from the balloon target value when |
| 639 | * starting the adjustment procedure in case someone changes the target when |
| 640 | * the procedure is in progress |
| 641 | */ |
| 642 | if (balloon->target > ram_size_pages - total_removed) { |
| 643 | bool can_hot_add = balloon->caps.cap_bits.hot_add; |
| 644 | uint64_t target_diff = balloon->target - |
| 645 | (ram_size_pages - total_removed); |
| 646 | |
| 647 | balloon->unballoon_diff = MIN(target_diff, total_removed); |
| 648 | |
| 649 | if (can_hot_add) { |
| 650 | balloon->hot_add_diff = target_diff - balloon->unballoon_diff; |
| 651 | } else { |
| 652 | balloon->hot_add_diff = 0; |
| 653 | } |
| 654 | |
| 655 | if (balloon->unballoon_diff > 0) { |
| 656 | assert(can_balloon); |
| 657 | HV_BALLOON_STATE_DESC_SET(stdesc, S_UNBALLOON_RB_WAIT); |
| 658 | } else if (balloon->hot_add_diff > 0) { |
| 659 | HV_BALLOON_STATE_DESC_SET(stdesc, S_HOT_ADD_SETUP); |
| 660 | } |
| 661 | } else if (can_balloon && |
| 662 | balloon->target < ram_size_pages - total_removed) { |
| 663 | balloon->balloon_diff = ram_size_pages - total_removed - |
| 664 | balloon->target; |
| 665 | HV_BALLOON_STATE_DESC_SET(stdesc, S_BALLOON_RB_WAIT); |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | static void hv_balloon_idle_state(HvBalloon *balloon, |
| 670 | StateDesc *stdesc) |
| 671 | { |
| 672 | assert(balloon->state == S_IDLE); |
| 673 | |
| 674 | if (balloon->target_changed) { |
| 675 | balloon->target_changed = false; |
| 676 | hv_balloon_idle_state_process_target(balloon, stdesc); |
| 677 | return; |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | static const struct { |
| 682 | void (*handler)(HvBalloon *balloon, StateDesc *stdesc); |
| 683 | } state_handlers[] = { |
| 684 | [S_IDLE].handler = hv_balloon_idle_state, |
| 685 | [S_BALLOON_POSTING].handler = hv_balloon_balloon_posting, |
| 686 | [S_BALLOON_RB_WAIT].handler = hv_balloon_balloon_rb_wait, |
| 687 | [S_UNBALLOON_POSTING].handler = hv_balloon_unballoon_posting, |
| 688 | [S_UNBALLOON_RB_WAIT].handler = hv_balloon_unballoon_rb_wait, |
| 689 | [S_HOT_ADD_SETUP].handler = hv_balloon_hot_add_setup, |
| 690 | [S_HOT_ADD_RB_WAIT].handler = hv_balloon_hot_add_rb_wait, |
| 691 | [S_HOT_ADD_POSTING].handler = hv_balloon_hot_add_posting, |
| 692 | }; |
| 693 | |
| 694 | static void hv_balloon_handle_state(HvBalloon *balloon, StateDesc *stdesc) |
| 695 | { |
| 696 | if (balloon->state >= ARRAY_SIZE(state_handlers) || |
| 697 | !state_handlers[balloon->state].handler) { |
| 698 | return; |
| 699 | } |
| 700 | |
| 701 | state_handlers[balloon->state].handler(balloon, stdesc); |
| 702 | } |
| 703 | |
| 704 | static void hv_balloon_remove_response_insert_range(PageRangeTree tree, |
| 705 | const PageRange *range, |
| 706 | uint64_t *ctr1, |
| 707 | uint64_t *ctr2, |
| 708 | uint64_t *ctr3) |
| 709 | { |
| 710 | uint64_t dupcount, effcount; |
| 711 | |
| 712 | if (range->count == 0) { |
| 713 | return; |
| 714 | } |
| 715 | |
| 716 | dupcount = 0; |
| 717 | hvb_page_range_tree_insert(tree, range->start, range->count, &dupcount); |
| 718 | |
| 719 | assert(dupcount <= range->count); |
| 720 | effcount = range->count - dupcount; |
| 721 | |
| 722 | *ctr1 += effcount; |
| 723 | *ctr2 += effcount; |
| 724 | if (ctr3) { |
| 725 | *ctr3 += effcount; |
| 726 | } |
| 727 | } |
| 728 | |
| 729 | static void hv_balloon_remove_response_handle_range(HvBalloon *balloon, |
| 730 | PageRange *range, |
| 731 | bool both, |
| 732 | uint64_t *removedctr) |
| 733 | { |
| 734 | OurRange *our_range = OUR_RANGE(balloon->our_range); |
| 735 | PageRangeTree globaltree = |
| 736 | both ? balloon->removed_both : balloon->removed_guest; |
| 737 | uint64_t *globalctr = |
| 738 | both ? &balloon->removed_both_ctr : &balloon->removed_guest_ctr; |
| 739 | PageRange rangeeff; |
| 740 | |
| 741 | if (range->count == 0) { |
| 742 | return; |
| 743 | } |
| 744 | |
| 745 | trace_hv_balloon_remove_response(range->count, range->start, both); |
| 746 | |
| 747 | if (our_range) { |
| 748 | /* Includes the not-yet-hot-added and unusable parts. */ |
| 749 | rangeeff = our_range->range; |
| 750 | } else { |
| 751 | rangeeff.start = rangeeff.count = 0; |
| 752 | } |
| 753 | |
| 754 | if (page_range_intersection_size(range, rangeeff.start, rangeeff.count) > 0) { |
| 755 | PageRangeTree ourtree = our_range_get_removed_tree(our_range, both); |
| 756 | PageRange rangehole, rangecommon; |
| 757 | uint64_t ourremoved = 0; |
| 758 | |
| 759 | /* process the hole before our range, if it exists */ |
| 760 | page_range_part_before(range, rangeeff.start, &rangehole); |
| 761 | hv_balloon_remove_response_insert_range(globaltree, &rangehole, |
| 762 | globalctr, removedctr, NULL); |
| 763 | if (rangehole.count > 0) { |
| 764 | trace_hv_balloon_remove_response_hole(rangehole.count, |
| 765 | rangehole.start, |
| 766 | range->count, range->start, |
| 767 | rangeeff.start, both); |
| 768 | } |
| 769 | |
| 770 | /* process our part */ |
| 771 | page_range_intersect(range, rangeeff.start, rangeeff.count, |
| 772 | &rangecommon); |
| 773 | hv_balloon_remove_response_insert_range(ourtree, &rangecommon, |
| 774 | globalctr, removedctr, |
| 775 | &ourremoved); |
| 776 | if (rangecommon.count > 0) { |
| 777 | trace_hv_balloon_remove_response_common(rangecommon.count, |
| 778 | rangecommon.start, |
| 779 | range->count, range->start, |
| 780 | rangeeff.count, |
| 781 | rangeeff.start, ourremoved, |
| 782 | both); |
| 783 | } |
| 784 | |
| 785 | /* calculate what's left after our range */ |
| 786 | rangecommon = *range; |
| 787 | page_range_part_after(&rangecommon, rangeeff.start, rangeeff.count, |
| 788 | range); |
| 789 | } |
| 790 | |
| 791 | /* process the remainder of the range that lies after our range */ |
| 792 | if (range->count > 0) { |
| 793 | hv_balloon_remove_response_insert_range(globaltree, range, |
| 794 | globalctr, removedctr, NULL); |
| 795 | trace_hv_balloon_remove_response_remainder(range->count, range->start, |
| 796 | both); |
| 797 | range->count = 0; |
| 798 | } |
| 799 | } |
| 800 | |
| 801 | static void hv_balloon_remove_response_handle_pages(HvBalloon *balloon, |
| 802 | PageRange *range, |
| 803 | uint64_t start, |
| 804 | uint64_t count, |
| 805 | bool both, |
| 806 | uint64_t *removedctr) |
| 807 | { |
| 808 | assert(count > 0); |
| 809 | |
| 810 | /* |
| 811 | * if there is an existing range that the new range can't be joined to |
| 812 | * dump it into tree(s) |
| 813 | */ |
| 814 | if (range->count > 0 && !page_range_joinable(range, start, count)) { |
| 815 | hv_balloon_remove_response_handle_range(balloon, range, both, |
| 816 | removedctr); |
| 817 | } |
| 818 | |
| 819 | if (range->count == 0) { |
| 820 | range->start = start; |
| 821 | range->count = count; |
| 822 | } else if (page_range_joinable_left(range, start, count)) { |
| 823 | range->start = start; |
| 824 | range->count += count; |
| 825 | } else { /* page_range_joinable_right() */ |
| 826 | range->count += count; |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | static gboolean hv_balloon_handle_remove_host_addr_node(gpointer key, |
| 831 | gpointer value, |
| 832 | gpointer data) |
| 833 | { |
| 834 | PageRange *range = value; |
| 835 | uint64_t pageoff; |
| 836 | |
| 837 | for (pageoff = 0; pageoff < range->count; ) { |
| 838 | uint64_t addr_64 = (range->start + pageoff) * HV_BALLOON_PAGE_SIZE; |
| 839 | void *addr; |
| 840 | RAMBlock *rb; |
| 841 | ram_addr_t rb_offset; |
| 842 | size_t rb_page_size; |
| 843 | size_t discard_size; |
| 844 | |
| 845 | assert(addr_64 <= UINTPTR_MAX); |
| 846 | addr = (void *)((uintptr_t)addr_64); |
| 847 | rb = qemu_ram_block_from_host(addr, false, &rb_offset); |
| 848 | rb_page_size = qemu_ram_pagesize(rb); |
| 849 | |
| 850 | if (rb_page_size != HV_BALLOON_PAGE_SIZE) { |
| 851 | /* TODO: these should end in "removed_guest" */ |
| 852 | warn_report("guest reported removed page backed by unsupported page size %zu", |
| 853 | rb_page_size); |
| 854 | pageoff++; |
| 855 | continue; |
| 856 | } |
| 857 | |
| 858 | discard_size = MIN(range->count - pageoff, |
| 859 | (rb->max_length - rb_offset) / |
| 860 | HV_BALLOON_PAGE_SIZE); |
| 861 | discard_size = MAX(discard_size, 1); |
| 862 | |
| 863 | if (ram_block_discard_range(rb, rb_offset, discard_size * |
| 864 | HV_BALLOON_PAGE_SIZE) != 0) { |
| 865 | warn_report("guest reported removed page failed discard"); |
| 866 | } |
| 867 | |
| 868 | pageoff += discard_size; |
| 869 | } |
| 870 | |
| 871 | return false; |
| 872 | } |
| 873 | |
| 874 | static void hv_balloon_handle_remove_host_addr_tree(PageRangeTree tree) |
| 875 | { |
| 876 | g_tree_foreach(tree.t, hv_balloon_handle_remove_host_addr_node, NULL); |
| 877 | } |
| 878 | |
| 879 | static int hv_balloon_handle_remove_section(PageRangeTree tree, |
| 880 | const MemoryRegionSection *section, |
| 881 | uint64_t count) |
| 882 | { |
| 883 | void *addr = memory_region_get_ram_ptr(section->mr) + |
| 884 | section->offset_within_region; |
| 885 | uint64_t addr_page; |
| 886 | |
| 887 | assert(count > 0); |
| 888 | |
| 889 | if ((uintptr_t)addr % HV_BALLOON_PAGE_SIZE) { |
| 890 | warn_report("guest reported removed pages at an unaligned host addr %p", |
| 891 | addr); |
| 892 | return -EINVAL; |
| 893 | } |
| 894 | |
| 895 | addr_page = (uintptr_t)addr / HV_BALLOON_PAGE_SIZE; |
| 896 | hvb_page_range_tree_insert(tree, addr_page, count, NULL); |
| 897 | |
| 898 | return 0; |
| 899 | } |
| 900 | |
| 901 | static void hv_balloon_handle_remove_ranges(HvBalloon *balloon, |
| 902 | union dm_mem_page_range ranges[], |
| 903 | uint32_t count) |
| 904 | { |
| 905 | uint64_t removedcnt; |
| 906 | PageRangeTree removed_host_addr; |
| 907 | PageRange range_guest, range_both; |
| 908 | |
| 909 | hvb_page_range_tree_init(&removed_host_addr); |
| 910 | range_guest.count = range_both.count = removedcnt = 0; |
| 911 | for (unsigned int ctr = 0; ctr < count; ctr++) { |
| 912 | union dm_mem_page_range *mr = &ranges[ctr]; |
| 913 | hwaddr pa; |
| 914 | MemoryRegionSection section; |
| 915 | |
| 916 | for (unsigned int offset = 0; offset < mr->finfo.page_cnt; ) { |
| 917 | int ret; |
| 918 | uint64_t pageno = mr->finfo.start_page + offset; |
| 919 | uint64_t pagecnt = 1; |
| 920 | |
| 921 | pa = (hwaddr)pageno << HV_BALLOON_PFN_SHIFT; |
| 922 | section = memory_region_find(get_system_memory(), pa, |
| 923 | (mr->finfo.page_cnt - offset) * |
| 924 | HV_BALLOON_PAGE_SIZE); |
| 925 | if (!section.mr) { |
| 926 | warn_report("guest reported removed page %"PRIu64" not found in RAM", |
| 927 | pageno); |
| 928 | ret = -EINVAL; |
| 929 | goto finish_page; |
| 930 | } |
| 931 | |
| 932 | pagecnt = int128_get64(section.size) / HV_BALLOON_PAGE_SIZE; |
| 933 | if (pagecnt <= 0) { |
| 934 | warn_report("guest reported removed page %"PRIu64" in a section smaller than page size", |
| 935 | pageno); |
| 936 | pagecnt = 1; /* skip the whole page */ |
| 937 | ret = -EINVAL; |
| 938 | goto finish_page; |
| 939 | } |
| 940 | |
| 941 | if (!memory_region_is_ram(section.mr) || |
| 942 | memory_region_is_rom(section.mr) || |
| 943 | memory_region_is_romd(section.mr)) { |
| 944 | warn_report("guest reported removed page %"PRIu64" in a section that is not an ordinary RAM", |
| 945 | pageno); |
| 946 | ret = -EINVAL; |
| 947 | goto finish_page; |
| 948 | } |
| 949 | |
| 950 | ret = hv_balloon_handle_remove_section(removed_host_addr, §ion, |
| 951 | pagecnt); |
| 952 | |
| 953 | finish_page: |
| 954 | if (ret == 0) { |
| 955 | hv_balloon_remove_response_handle_pages(balloon, |
| 956 | &range_both, |
| 957 | pageno, pagecnt, |
| 958 | true, &removedcnt); |
| 959 | } else { |
| 960 | hv_balloon_remove_response_handle_pages(balloon, |
| 961 | &range_guest, |
| 962 | pageno, pagecnt, |
| 963 | false, &removedcnt); |
| 964 | } |
| 965 | |
| 966 | if (section.mr) { |
| 967 | memory_region_unref(section.mr); |
| 968 | } |
| 969 | |
| 970 | offset += pagecnt; |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | hv_balloon_remove_response_handle_range(balloon, &range_both, true, |
| 975 | &removedcnt); |
| 976 | hv_balloon_remove_response_handle_range(balloon, &range_guest, false, |
| 977 | &removedcnt); |
| 978 | |
| 979 | hv_balloon_handle_remove_host_addr_tree(removed_host_addr); |
| 980 | hvb_page_range_tree_destroy(&removed_host_addr); |
| 981 | |
| 982 | if (removedcnt > balloon->balloon_diff) { |
| 983 | warn_report("guest reported more pages removed than currently pending (%"PRIu64" vs %"PRIu64")", |
| 984 | removedcnt, balloon->balloon_diff); |
| 985 | balloon->balloon_diff = 0; |
| 986 | } else { |
| 987 | balloon->balloon_diff -= removedcnt; |
| 988 | } |
| 989 | } |
| 990 | |
| 991 | static bool hv_balloon_handle_msg_size(HvBalloonReq *req, size_t minsize, |
| 992 | const char *msgname) |
| 993 | { |
| 994 | VMBusChanReq *vmreq = &req->vmreq; |
| 995 | uint32_t msglen = vmreq->msglen; |
| 996 | |
| 997 | if (msglen >= minsize) { |
| 998 | return true; |
| 999 | } |
| 1000 | |
| 1001 | warn_report("%s message too short (%u vs %zu), ignoring", msgname, |
| 1002 | (unsigned int)msglen, minsize); |
| 1003 | return false; |
| 1004 | } |
| 1005 | |
| 1006 | static void hv_balloon_handle_version_request(HvBalloon *balloon, |
| 1007 | HvBalloonReq *req, |
| 1008 | StateDesc *stdesc) |
| 1009 | { |
| 1010 | VMBusChanReq *vmreq = &req->vmreq; |
| 1011 | struct dm_version_request *msgVr = vmreq->msg; |
| 1012 | struct dm_version_response respVr; |
| 1013 | |
| 1014 | if (balloon->state != S_VERSION) { |
| 1015 | warn_report("unexpected DM_VERSION_REQUEST in %d state", |
| 1016 | balloon->state); |
| 1017 | return; |
| 1018 | } |
| 1019 | |
| 1020 | if (!hv_balloon_handle_msg_size(req, sizeof(*msgVr), |
| 1021 | "DM_VERSION_REQUEST")) { |
| 1022 | return; |
| 1023 | } |
| 1024 | |
| 1025 | trace_hv_balloon_incoming_version(msgVr->version.major_version, |
| 1026 | msgVr->version.minor_version); |
| 1027 | |
| 1028 | memset(&respVr, 0, sizeof(respVr)); |
| 1029 | respVr.hdr.type = DM_VERSION_RESPONSE; |
| 1030 | respVr.hdr.size = sizeof(respVr); |
| 1031 | respVr.hdr.trans_id = msgVr->hdr.trans_id; |
| 1032 | respVr.is_accepted = msgVr->version.version >= DYNMEM_PROTOCOL_VERSION_1 && |
| 1033 | msgVr->version.version <= DYNMEM_PROTOCOL_VERSION_3; |
| 1034 | |
| 1035 | hv_balloon_send_packet(vmreq->chan, (struct dm_message *)&respVr); |
| 1036 | |
| 1037 | if (respVr.is_accepted) { |
| 1038 | HV_BALLOON_STATE_DESC_SET(stdesc, S_CAPS); |
| 1039 | } |
| 1040 | } |
| 1041 | |
| 1042 | static void hv_balloon_handle_caps_report(HvBalloon *balloon, |
| 1043 | HvBalloonReq *req, |
| 1044 | StateDesc *stdesc) |
| 1045 | { |
| 1046 | VMBusChanReq *vmreq = &req->vmreq; |
| 1047 | struct dm_capabilities *msgCap = vmreq->msg; |
| 1048 | struct dm_capabilities_resp_msg respCap; |
| 1049 | |
| 1050 | if (balloon->state != S_CAPS) { |
| 1051 | warn_report("unexpected DM_CAPABILITIES_REPORT in %d state", |
| 1052 | balloon->state); |
| 1053 | return; |
| 1054 | } |
| 1055 | |
| 1056 | if (!hv_balloon_handle_msg_size(req, sizeof(*msgCap), |
| 1057 | "DM_CAPABILITIES_REPORT")) { |
| 1058 | return; |
| 1059 | } |
| 1060 | |
| 1061 | trace_hv_balloon_incoming_caps(msgCap->caps.caps); |
| 1062 | balloon->caps = msgCap->caps; |
| 1063 | |
| 1064 | memset(&respCap, 0, sizeof(respCap)); |
| 1065 | respCap.hdr.type = DM_CAPABILITIES_RESPONSE; |
| 1066 | respCap.hdr.size = sizeof(respCap); |
| 1067 | respCap.hdr.trans_id = msgCap->hdr.trans_id; |
| 1068 | respCap.is_accepted = 1; |
| 1069 | respCap.hot_remove = 1; |
| 1070 | respCap.suppress_pressure_reports = !balloon->status_report.enabled; |
| 1071 | hv_balloon_send_packet(vmreq->chan, (struct dm_message *)&respCap); |
| 1072 | |
| 1073 | timer_mod(&balloon->post_init_timer, |
| 1074 | qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + |
| 1075 | HV_BALLOON_POST_INIT_WAIT); |
| 1076 | |
| 1077 | HV_BALLOON_STATE_DESC_SET(stdesc, S_POST_INIT_WAIT); |
| 1078 | } |
| 1079 | |
| 1080 | static void hv_balloon_handle_status_report(HvBalloon *balloon, |
| 1081 | HvBalloonReq *req) |
| 1082 | { |
| 1083 | VMBusChanReq *vmreq = &req->vmreq; |
| 1084 | struct dm_status *msgStatus = vmreq->msg; |
| 1085 | |
| 1086 | if (!hv_balloon_handle_msg_size(req, sizeof(*msgStatus), |
| 1087 | "DM_STATUS_REPORT")) { |
| 1088 | return; |
| 1089 | } |
| 1090 | |
| 1091 | if (!balloon->status_report.enabled) { |
| 1092 | return; |
| 1093 | } |
| 1094 | |
| 1095 | balloon->status_report.committed = msgStatus->num_committed; |
| 1096 | balloon->status_report.committed *= HV_BALLOON_PAGE_SIZE; |
| 1097 | balloon->status_report.available = msgStatus->num_avail; |
| 1098 | balloon->status_report.available *= HV_BALLOON_PAGE_SIZE; |
| 1099 | balloon->status_report.received = true; |
| 1100 | |
| 1101 | qapi_event_send_hv_balloon_status_report(balloon->status_report.committed, |
| 1102 | balloon->status_report.available); |
| 1103 | } |
| 1104 | |
| 1105 | HvBalloonInfo *qmp_query_hv_balloon_status_report(Error **errp) |
| 1106 | { |
| 1107 | HvBalloon *balloon; |
| 1108 | HvBalloonInfo *info; |
| 1109 | |
| 1110 | balloon = HV_BALLOON(object_resolve_path_type("", TYPE_HV_BALLOON, NULL)); |
| 1111 | if (!balloon) { |
| 1112 | error_setg(errp, "no %s device present", TYPE_HV_BALLOON); |
| 1113 | return NULL; |
| 1114 | } |
| 1115 | |
| 1116 | if (!balloon->status_report.enabled) { |
| 1117 | error_setg(errp, "guest memory status reporting not enabled"); |
| 1118 | return NULL; |
| 1119 | } |
| 1120 | |
| 1121 | if (!balloon->status_report.received) { |
| 1122 | error_setg(errp, "no guest memory status report received yet"); |
| 1123 | return NULL; |
| 1124 | } |
| 1125 | |
| 1126 | info = g_malloc0(sizeof(*info)); |
| 1127 | info->committed = balloon->status_report.committed; |
| 1128 | info->available = balloon->status_report.available; |
| 1129 | return info; |
| 1130 | } |
| 1131 | |
| 1132 | static void hv_balloon_handle_unballoon_response(HvBalloon *balloon, |
| 1133 | HvBalloonReq *req, |
| 1134 | StateDesc *stdesc) |
| 1135 | { |
| 1136 | VMBusChanReq *vmreq = &req->vmreq; |
| 1137 | struct dm_unballoon_response *msgUrR = vmreq->msg; |
| 1138 | |
| 1139 | if (balloon->state != S_UNBALLOON_REPLY_WAIT) { |
| 1140 | warn_report("unexpected DM_UNBALLOON_RESPONSE in %d state", |
| 1141 | balloon->state); |
| 1142 | return; |
| 1143 | } |
| 1144 | |
| 1145 | if (!hv_balloon_handle_msg_size(req, sizeof(*msgUrR), |
| 1146 | "DM_UNBALLOON_RESPONSE")) |
| 1147 | return; |
| 1148 | |
| 1149 | trace_hv_balloon_incoming_unballoon(msgUrR->hdr.trans_id); |
| 1150 | |
| 1151 | balloon->trans_id++; |
| 1152 | |
| 1153 | if (balloon->hot_add_diff > 0) { |
| 1154 | bool can_hot_add = balloon->caps.cap_bits.hot_add; |
| 1155 | |
| 1156 | assert(can_hot_add); |
| 1157 | HV_BALLOON_STATE_DESC_SET(stdesc, S_HOT_ADD_SETUP); |
| 1158 | } else { |
| 1159 | HV_BALLOON_STATE_DESC_SET(stdesc, S_IDLE); |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | static void hv_balloon_handle_hot_add_response(HvBalloon *balloon, |
| 1164 | HvBalloonReq *req, |
| 1165 | StateDesc *stdesc) |
| 1166 | { |
| 1167 | PageRange *hot_add_range = &balloon->hot_add_range; |
| 1168 | VMBusChanReq *vmreq = &req->vmreq; |
| 1169 | struct dm_hot_add_response *msgHaR = vmreq->msg; |
| 1170 | OurRange *our_range; |
| 1171 | |
| 1172 | if (balloon->state != S_HOT_ADD_REPLY_WAIT) { |
| 1173 | warn_report("unexpected DM_HOT_ADD_RESPONSE in %d state", |
| 1174 | balloon->state); |
| 1175 | return; |
| 1176 | } |
| 1177 | |
| 1178 | assert(balloon->our_range); |
| 1179 | our_range = OUR_RANGE(balloon->our_range); |
| 1180 | |
| 1181 | if (!hv_balloon_handle_msg_size(req, sizeof(*msgHaR), |
| 1182 | "DM_HOT_ADD_RESPONSE")) |
| 1183 | return; |
| 1184 | |
| 1185 | trace_hv_balloon_incoming_hot_add(msgHaR->hdr.trans_id, msgHaR->result, |
| 1186 | msgHaR->page_count); |
| 1187 | |
| 1188 | balloon->trans_id++; |
| 1189 | |
| 1190 | if (msgHaR->result) { |
| 1191 | if (msgHaR->page_count > balloon->ha_current_count) { |
| 1192 | warn_report("DM_HOT_ADD_RESPONSE page count higher than requested (%"PRIu32" vs %"PRIu64")", |
| 1193 | msgHaR->page_count, balloon->ha_current_count); |
| 1194 | msgHaR->page_count = balloon->ha_current_count; |
| 1195 | } |
| 1196 | |
| 1197 | hvb_our_range_mark_added(our_range, msgHaR->page_count); |
| 1198 | hot_add_range->start += msgHaR->page_count; |
| 1199 | hot_add_range->count -= msgHaR->page_count; |
| 1200 | } |
| 1201 | |
| 1202 | if (!msgHaR->result || msgHaR->page_count < balloon->ha_current_count) { |
| 1203 | /* |
| 1204 | * the current planned range was only partially hot-added, take note |
| 1205 | * how much of it remains and don't attempt any further hot adds |
| 1206 | */ |
| 1207 | our_range_mark_remaining_unusable(our_range); |
| 1208 | |
| 1209 | goto ret_idle; |
| 1210 | } |
| 1211 | |
| 1212 | /* any pages remaining to hot-add in our range? */ |
| 1213 | if (hot_add_range->count > 0) { |
| 1214 | HV_BALLOON_STATE_DESC_SET(stdesc, S_HOT_ADD_RB_WAIT); |
| 1215 | return; |
| 1216 | } |
| 1217 | |
| 1218 | ret_idle: |
| 1219 | HV_BALLOON_STATE_DESC_SET(stdesc, S_IDLE); |
| 1220 | } |
| 1221 | |
| 1222 | static void hv_balloon_handle_balloon_response(HvBalloon *balloon, |
| 1223 | HvBalloonReq *req, |
| 1224 | StateDesc *stdesc) |
| 1225 | { |
| 1226 | VMBusChanReq *vmreq = &req->vmreq; |
| 1227 | struct dm_balloon_response *msgBR = vmreq->msg; |
| 1228 | |
| 1229 | if (balloon->state != S_BALLOON_REPLY_WAIT) { |
| 1230 | warn_report("unexpected DM_BALLOON_RESPONSE in %d state", |
| 1231 | balloon->state); |
| 1232 | return; |
| 1233 | } |
| 1234 | |
| 1235 | if (!hv_balloon_handle_msg_size(req, sizeof(*msgBR), |
| 1236 | "DM_BALLOON_RESPONSE")) |
| 1237 | return; |
| 1238 | |
| 1239 | trace_hv_balloon_incoming_balloon(msgBR->hdr.trans_id, msgBR->range_count, |
| 1240 | msgBR->more_pages); |
| 1241 | |
| 1242 | if (vmreq->msglen < sizeof(*msgBR) + |
| 1243 | (uint64_t)sizeof(msgBR->range_array[0]) * msgBR->range_count) { |
| 1244 | warn_report("DM_BALLOON_RESPONSE too short for the range count"); |
| 1245 | return; |
| 1246 | } |
| 1247 | |
| 1248 | if (msgBR->range_count == 0) { |
| 1249 | /* The guest is already at its minimum size */ |
| 1250 | balloon->balloon_diff = 0; |
| 1251 | goto ret_end_trans; |
| 1252 | } else { |
| 1253 | hv_balloon_handle_remove_ranges(balloon, |
| 1254 | msgBR->range_array, |
| 1255 | msgBR->range_count); |
| 1256 | } |
| 1257 | |
| 1258 | /* More responses expected? */ |
| 1259 | if (msgBR->more_pages) { |
| 1260 | return; |
| 1261 | } |
| 1262 | |
| 1263 | ret_end_trans: |
| 1264 | balloon->trans_id++; |
| 1265 | |
| 1266 | if (balloon->balloon_diff > 0) { |
| 1267 | HV_BALLOON_STATE_DESC_SET(stdesc, S_BALLOON_RB_WAIT); |
| 1268 | } else { |
| 1269 | HV_BALLOON_STATE_DESC_SET(stdesc, S_IDLE); |
| 1270 | } |
| 1271 | } |
| 1272 | |
| 1273 | static void hv_balloon_handle_packet(HvBalloon *balloon, HvBalloonReq *req, |
| 1274 | StateDesc *stdesc) |
| 1275 | { |
| 1276 | VMBusChanReq *vmreq = &req->vmreq; |
| 1277 | struct dm_message *msg = vmreq->msg; |
| 1278 | |
| 1279 | if (vmreq->msglen < sizeof(msg->hdr)) { |
| 1280 | return; |
| 1281 | } |
| 1282 | |
| 1283 | switch (msg->hdr.type) { |
| 1284 | case DM_VERSION_REQUEST: |
| 1285 | hv_balloon_handle_version_request(balloon, req, stdesc); |
| 1286 | break; |
| 1287 | |
| 1288 | case DM_CAPABILITIES_REPORT: |
| 1289 | hv_balloon_handle_caps_report(balloon, req, stdesc); |
| 1290 | break; |
| 1291 | |
| 1292 | case DM_STATUS_REPORT: |
| 1293 | hv_balloon_handle_status_report(balloon, req); |
| 1294 | break; |
| 1295 | |
| 1296 | case DM_MEM_HOT_ADD_RESPONSE: |
| 1297 | hv_balloon_handle_hot_add_response(balloon, req, stdesc); |
| 1298 | break; |
| 1299 | |
| 1300 | case DM_UNBALLOON_RESPONSE: |
| 1301 | hv_balloon_handle_unballoon_response(balloon, req, stdesc); |
| 1302 | break; |
| 1303 | |
| 1304 | case DM_BALLOON_RESPONSE: |
| 1305 | hv_balloon_handle_balloon_response(balloon, req, stdesc); |
| 1306 | break; |
| 1307 | |
| 1308 | default: |
| 1309 | warn_report("unknown DM message %u", msg->hdr.type); |
| 1310 | break; |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | static bool hv_balloon_recv_channel(HvBalloon *balloon, StateDesc *stdesc) |
| 1315 | { |
| 1316 | VMBusChannel *chan; |
| 1317 | HvBalloonReq *req; |
| 1318 | |
| 1319 | if (balloon->state == S_WAIT_RESET || |
| 1320 | balloon->state == S_POST_RESET_CLOSED) { |
| 1321 | return false; |
| 1322 | } |
| 1323 | |
| 1324 | chan = hv_balloon_get_channel(balloon); |
| 1325 | if (vmbus_channel_recv_start(chan)) { |
| 1326 | return false; |
| 1327 | } |
| 1328 | |
| 1329 | while ((req = vmbus_channel_recv_peek(chan, sizeof(*req)))) { |
| 1330 | hv_balloon_handle_packet(balloon, req, stdesc); |
| 1331 | vmbus_free_req(req); |
| 1332 | vmbus_channel_recv_pop(chan); |
| 1333 | |
| 1334 | if (stdesc->state != S_NO_CHANGE) { |
| 1335 | break; |
| 1336 | } |
| 1337 | } |
| 1338 | |
| 1339 | return vmbus_channel_recv_done(chan) > 0; |
| 1340 | } |
| 1341 | |
| 1342 | /* old state handler -> new state transition (potential) */ |
| 1343 | static bool hv_balloon_event_loop_state(HvBalloon *balloon) |
| 1344 | { |
| 1345 | StateDesc state_new = HV_BALLOON_STATE_DESC_INIT; |
| 1346 | |
| 1347 | hv_balloon_handle_state(balloon, &state_new); |
| 1348 | return hv_balloon_state_set(balloon, state_new.state, state_new.desc); |
| 1349 | } |
| 1350 | |
| 1351 | /* VMBus message -> new state transition (potential) */ |
| 1352 | static bool hv_balloon_event_loop_recv(HvBalloon *balloon) |
| 1353 | { |
| 1354 | StateDesc state_new = HV_BALLOON_STATE_DESC_INIT; |
| 1355 | bool any_recv, state_changed; |
| 1356 | |
| 1357 | any_recv = hv_balloon_recv_channel(balloon, &state_new); |
| 1358 | state_changed = hv_balloon_state_set(balloon, |
| 1359 | state_new.state, state_new.desc); |
| 1360 | |
| 1361 | return state_changed || any_recv; |
| 1362 | } |
| 1363 | |
| 1364 | static void hv_balloon_event_loop(HvBalloon *balloon) |
| 1365 | { |
| 1366 | bool state_repeat, recv_repeat; |
| 1367 | |
| 1368 | do { |
| 1369 | state_repeat = hv_balloon_event_loop_state(balloon); |
| 1370 | recv_repeat = hv_balloon_event_loop_recv(balloon); |
| 1371 | } while (state_repeat || recv_repeat); |
| 1372 | } |
| 1373 | |
| 1374 | static void hv_balloon_vmdev_chan_notify(VMBusChannel *chan) |
| 1375 | { |
| 1376 | HvBalloon *balloon = HV_BALLOON(vmbus_channel_device(chan)); |
| 1377 | |
| 1378 | hv_balloon_event_loop(balloon); |
| 1379 | } |
| 1380 | |
| 1381 | static void hv_balloon_stat(void *opaque, BalloonInfo *info) |
| 1382 | { |
| 1383 | HvBalloon *balloon = opaque; |
| 1384 | info->actual = (hv_balloon_total_ram(balloon) - balloon->removed_both_ctr) |
| 1385 | << HV_BALLOON_PFN_SHIFT; |
| 1386 | } |
| 1387 | |
| 1388 | static void hv_balloon_to_target(void *opaque, ram_addr_t target) |
| 1389 | { |
| 1390 | HvBalloon *balloon = opaque; |
| 1391 | uint64_t target_pages = target >> HV_BALLOON_PFN_SHIFT; |
| 1392 | |
| 1393 | if (!target_pages) { |
| 1394 | return; |
| 1395 | } |
| 1396 | |
| 1397 | /* |
| 1398 | * always set target_changed, even with unchanged target, as the user |
| 1399 | * might be asking us to try again reaching it |
| 1400 | */ |
| 1401 | balloon->target = target_pages; |
| 1402 | balloon->target_changed = true; |
| 1403 | |
| 1404 | hv_balloon_event_loop(balloon); |
| 1405 | } |
| 1406 | |
| 1407 | static int hv_balloon_vmdev_open_channel(VMBusChannel *chan) |
| 1408 | { |
| 1409 | HvBalloon *balloon = HV_BALLOON(vmbus_channel_device(chan)); |
| 1410 | |
| 1411 | if (balloon->state != S_POST_RESET_CLOSED) { |
| 1412 | warn_report("guest trying to open a DM channel in invalid %d state", |
| 1413 | balloon->state); |
| 1414 | return -EINVAL; |
| 1415 | } |
| 1416 | |
| 1417 | HV_BALLOON_SET_STATE(balloon, S_VERSION); |
| 1418 | hv_balloon_event_loop(balloon); |
| 1419 | |
| 1420 | return 0; |
| 1421 | } |
| 1422 | |
| 1423 | static void hv_balloon_vmdev_close_channel(VMBusChannel *chan) |
| 1424 | { |
| 1425 | HvBalloon *balloon = HV_BALLOON(vmbus_channel_device(chan)); |
| 1426 | |
| 1427 | timer_del(&balloon->post_init_timer); |
| 1428 | |
| 1429 | /* Don't report stale data */ |
| 1430 | balloon->status_report.received = false; |
| 1431 | |
| 1432 | HV_BALLOON_SET_STATE(balloon, S_WAIT_RESET); |
| 1433 | hv_balloon_event_loop(balloon); |
| 1434 | } |
| 1435 | |
| 1436 | static void hv_balloon_post_init_timer(void *opaque) |
| 1437 | { |
| 1438 | HvBalloon *balloon = opaque; |
| 1439 | |
| 1440 | if (balloon->state != S_POST_INIT_WAIT) { |
| 1441 | return; |
| 1442 | } |
| 1443 | |
| 1444 | HV_BALLOON_SET_STATE(balloon, S_IDLE); |
| 1445 | hv_balloon_event_loop(balloon); |
| 1446 | } |
| 1447 | |
| 1448 | static void hv_balloon_system_reset_unrealize_common(HvBalloon *balloon) |
| 1449 | { |
| 1450 | g_clear_pointer(&balloon->our_range, hvb_our_range_memslots_free); |
| 1451 | } |
| 1452 | |
| 1453 | static void hv_balloon_system_reset(void *opaque) |
| 1454 | { |
| 1455 | HvBalloon *balloon = HV_BALLOON(opaque); |
| 1456 | |
| 1457 | hv_balloon_system_reset_unrealize_common(balloon); |
| 1458 | } |
| 1459 | |
| 1460 | static void hv_balloon_ensure_mr(HvBalloon *balloon) |
| 1461 | { |
| 1462 | MemoryRegion *hostmem_mr; |
| 1463 | |
| 1464 | assert(balloon->hostmem); |
| 1465 | |
| 1466 | if (balloon->mr) { |
| 1467 | return; |
| 1468 | } |
| 1469 | |
| 1470 | hostmem_mr = host_memory_backend_get_memory(balloon->hostmem); |
| 1471 | |
| 1472 | balloon->mr = g_new0(MemoryRegion, 1); |
| 1473 | memory_region_init(balloon->mr, OBJECT(balloon), TYPE_HV_BALLOON, |
| 1474 | memory_region_size(hostmem_mr)); |
| 1475 | balloon->mr->align = memory_region_get_alignment(hostmem_mr); |
| 1476 | } |
| 1477 | |
| 1478 | static void hv_balloon_vmdev_realize(VMBusDevice *vdev, Error **errp) |
| 1479 | { |
| 1480 | ERRP_GUARD(); |
| 1481 | HvBalloon *balloon = HV_BALLOON(vdev); |
| 1482 | int ret; |
| 1483 | |
| 1484 | balloon->state = S_WAIT_RESET; |
| 1485 | |
| 1486 | ret = qemu_add_balloon_handler(hv_balloon_to_target, hv_balloon_stat, |
| 1487 | balloon); |
| 1488 | if (ret < 0) { |
| 1489 | /* This also protects against having multiple hv-balloon instances */ |
| 1490 | error_setg(errp, "Only one balloon device is supported"); |
| 1491 | return; |
| 1492 | } |
| 1493 | |
| 1494 | if (balloon->hostmem) { |
| 1495 | if (host_memory_backend_is_mapped(balloon->hostmem)) { |
| 1496 | Object *obj = OBJECT(balloon->hostmem); |
| 1497 | |
| 1498 | error_setg(errp, "'%s' property specifies a busy memdev: %s", |
| 1499 | HV_BALLOON_MEMDEV_PROP, |
| 1500 | object_get_canonical_path_component(obj)); |
| 1501 | goto out_balloon_handler; |
| 1502 | } |
| 1503 | |
| 1504 | hv_balloon_ensure_mr(balloon); |
| 1505 | |
| 1506 | /* This is rather unlikely to happen, but let's still check for it. */ |
| 1507 | if (!QEMU_IS_ALIGNED(memory_region_size(balloon->mr), |
| 1508 | HV_BALLOON_PAGE_SIZE)) { |
| 1509 | error_setg(errp, "'%s' property memdev size has to be a multiple of 0x%" PRIx64, |
| 1510 | HV_BALLOON_MEMDEV_PROP, (uint64_t)HV_BALLOON_PAGE_SIZE); |
| 1511 | goto out_balloon_handler; |
| 1512 | } |
| 1513 | |
| 1514 | host_memory_backend_set_mapped(balloon->hostmem, true); |
| 1515 | vmstate_register_ram(host_memory_backend_get_memory(balloon->hostmem), |
| 1516 | DEVICE(balloon)); |
| 1517 | } else if (balloon->addr) { |
| 1518 | error_setg(errp, "'%s' property must not be set without a memdev", |
| 1519 | HV_BALLOON_MEMDEV_PROP); |
| 1520 | goto out_balloon_handler; |
| 1521 | } |
| 1522 | |
| 1523 | timer_init_ms(&balloon->post_init_timer, QEMU_CLOCK_VIRTUAL, |
| 1524 | hv_balloon_post_init_timer, balloon); |
| 1525 | |
| 1526 | qemu_register_reset(hv_balloon_system_reset, balloon); |
| 1527 | |
| 1528 | return; |
| 1529 | |
| 1530 | out_balloon_handler: |
| 1531 | qemu_remove_balloon_handler(balloon); |
| 1532 | } |
| 1533 | |
| 1534 | /* |
| 1535 | * VMBus device reset has to be implemented in case the guest decides to |
| 1536 | * disconnect and reconnect to the VMBus without rebooting the whole system. |
| 1537 | * |
| 1538 | * However, the hot-added memory can't be removed here as Windows keeps on using |
| 1539 | * it until the system is restarted, even after disconnecting from the VMBus. |
| 1540 | */ |
| 1541 | static void hv_balloon_vmdev_reset(VMBusDevice *vdev) |
| 1542 | { |
| 1543 | HvBalloon *balloon = HV_BALLOON(vdev); |
| 1544 | |
| 1545 | if (balloon->state == S_POST_RESET_CLOSED) { |
| 1546 | return; |
| 1547 | } |
| 1548 | |
| 1549 | if (balloon->our_range) { |
| 1550 | hvb_our_range_clear_removed_trees(OUR_RANGE(balloon->our_range)); |
| 1551 | } |
| 1552 | |
| 1553 | hvb_page_range_tree_destroy(&balloon->removed_guest); |
| 1554 | hvb_page_range_tree_destroy(&balloon->removed_both); |
| 1555 | hvb_page_range_tree_init(&balloon->removed_guest); |
| 1556 | hvb_page_range_tree_init(&balloon->removed_both); |
| 1557 | |
| 1558 | balloon->trans_id = 0; |
| 1559 | balloon->removed_guest_ctr = 0; |
| 1560 | balloon->removed_both_ctr = 0; |
| 1561 | |
| 1562 | HV_BALLOON_SET_STATE(balloon, S_POST_RESET_CLOSED); |
| 1563 | hv_balloon_event_loop(balloon); |
| 1564 | } |
| 1565 | |
| 1566 | /* |
| 1567 | * Clean up things that were (possibly) allocated pre-realization, for example |
| 1568 | * from memory_device_pre_plug(), so we don't leak them if the device don't |
| 1569 | * actually get realized in the end. |
| 1570 | */ |
| 1571 | static void hv_balloon_unrealize_finalize_common(HvBalloon *balloon) |
| 1572 | { |
| 1573 | g_clear_pointer(&balloon->mr, g_free); |
| 1574 | balloon->addr = 0; |
| 1575 | |
| 1576 | balloon->memslot_count = 0; |
| 1577 | } |
| 1578 | |
| 1579 | static void hv_balloon_vmdev_unrealize(VMBusDevice *vdev) |
| 1580 | { |
| 1581 | HvBalloon *balloon = HV_BALLOON(vdev); |
| 1582 | |
| 1583 | qemu_unregister_reset(hv_balloon_system_reset, balloon); |
| 1584 | |
| 1585 | hv_balloon_system_reset_unrealize_common(balloon); |
| 1586 | |
| 1587 | qemu_remove_balloon_handler(balloon); |
| 1588 | |
| 1589 | if (balloon->hostmem) { |
| 1590 | vmstate_unregister_ram(host_memory_backend_get_memory(balloon->hostmem), |
| 1591 | DEVICE(balloon)); |
| 1592 | host_memory_backend_set_mapped(balloon->hostmem, false); |
| 1593 | } |
| 1594 | |
| 1595 | hvb_page_range_tree_destroy(&balloon->removed_guest); |
| 1596 | hvb_page_range_tree_destroy(&balloon->removed_both); |
| 1597 | |
| 1598 | hv_balloon_unrealize_finalize_common(balloon); |
| 1599 | } |
| 1600 | |
| 1601 | static uint64_t hv_balloon_md_get_addr(const MemoryDeviceState *md) |
| 1602 | { |
| 1603 | return object_property_get_uint(OBJECT(md), HV_BALLOON_ADDR_PROP, |
| 1604 | &error_abort); |
| 1605 | } |
| 1606 | |
| 1607 | static void hv_balloon_md_set_addr(MemoryDeviceState *md, uint64_t addr, |
| 1608 | Error **errp) |
| 1609 | { |
| 1610 | object_property_set_uint(OBJECT(md), HV_BALLOON_ADDR_PROP, addr, errp); |
| 1611 | } |
| 1612 | |
| 1613 | static MemoryRegion *hv_balloon_md_get_memory_region(MemoryDeviceState *md, |
| 1614 | Error **errp) |
| 1615 | { |
| 1616 | HvBalloon *balloon = HV_BALLOON(md); |
| 1617 | |
| 1618 | if (!balloon->hostmem) { |
| 1619 | return NULL; |
| 1620 | } |
| 1621 | |
| 1622 | hv_balloon_ensure_mr(balloon); |
| 1623 | |
| 1624 | return balloon->mr; |
| 1625 | } |
| 1626 | |
| 1627 | static uint64_t hv_balloon_md_get_min_alignment(const MemoryDeviceState *md) |
| 1628 | { |
| 1629 | /* |
| 1630 | * The VM can indicate an alignment up to 32 GiB. Memory device core can |
| 1631 | * usually only handle/guarantee 1 GiB alignment. The user will have to |
| 1632 | * specify a larger maxmem eventually. |
| 1633 | * |
| 1634 | * The memory device core will warn the user in case maxmem might have to be |
| 1635 | * increased and will fail plugging the device if there is not sufficient |
| 1636 | * space after alignment. |
| 1637 | * |
| 1638 | * TODO: we could do the alignment ourselves in a slightly bigger region. |
| 1639 | * But this feels better, although the warning might be annoying. Maybe |
| 1640 | * we can optimize that in the future (e.g., with such a device on the |
| 1641 | * cmdline place/size the device memory region differently. |
| 1642 | */ |
| 1643 | return 32 * GiB; |
| 1644 | } |
| 1645 | |
| 1646 | static void hv_balloon_md_fill_device_info(const MemoryDeviceState *md, |
| 1647 | MemoryDeviceInfo *info) |
| 1648 | { |
| 1649 | HvBalloonDeviceInfo *hi = g_new0(HvBalloonDeviceInfo, 1); |
| 1650 | const HvBalloon *balloon = HV_BALLOON(md); |
| 1651 | DeviceState *dev = DEVICE(md); |
| 1652 | |
| 1653 | if (dev->id) { |
| 1654 | hi->id = g_strdup(dev->id); |
| 1655 | } |
| 1656 | |
| 1657 | if (balloon->hostmem) { |
| 1658 | hi->memdev = object_get_canonical_path(OBJECT(balloon->hostmem)); |
| 1659 | hi->memaddr = balloon->addr; |
| 1660 | hi->has_memaddr = true; |
| 1661 | hi->max_size = memory_region_size(balloon->mr); |
| 1662 | /* TODO: expose current provided size or something else? */ |
| 1663 | } else { |
| 1664 | hi->max_size = 0; |
| 1665 | } |
| 1666 | |
| 1667 | info->u.hv_balloon.data = hi; |
| 1668 | info->type = MEMORY_DEVICE_INFO_KIND_HV_BALLOON; |
| 1669 | } |
| 1670 | |
| 1671 | static void hv_balloon_decide_memslots(MemoryDeviceState *md, |
| 1672 | unsigned int limit) |
| 1673 | { |
| 1674 | HvBalloon *balloon = HV_BALLOON(md); |
| 1675 | MemoryRegion *hostmem_mr; |
| 1676 | uint64_t region_size, memslot_size, memslots; |
| 1677 | |
| 1678 | /* We're called exactly once, before realizing the device. */ |
| 1679 | assert(!balloon->memslot_count); |
| 1680 | |
| 1681 | /* We should not be called if we don't have a memory backend */ |
| 1682 | assert(balloon->hostmem); |
| 1683 | |
| 1684 | hostmem_mr = host_memory_backend_get_memory(balloon->hostmem); |
| 1685 | region_size = memory_region_size(hostmem_mr); |
| 1686 | |
| 1687 | assert(region_size > 0); |
| 1688 | memslot_size = QEMU_ALIGN_UP(region_size / limit, |
| 1689 | HV_BALLOON_HA_MEMSLOT_SIZE_ALIGN); |
| 1690 | memslots = QEMU_ALIGN_UP(region_size, memslot_size) / memslot_size; |
| 1691 | |
| 1692 | if (memslots > 1) { |
| 1693 | balloon->memslot_size = memslot_size; |
| 1694 | } else { |
| 1695 | balloon->memslot_size = region_size; |
| 1696 | } |
| 1697 | |
| 1698 | assert(memslots <= UINT_MAX); |
| 1699 | balloon->memslot_count = memslots; |
| 1700 | } |
| 1701 | |
| 1702 | static unsigned int hv_balloon_get_memslots(MemoryDeviceState *md) |
| 1703 | { |
| 1704 | const HvBalloon *balloon = HV_BALLOON(md); |
| 1705 | |
| 1706 | /* We're called after setting the suggested limit. */ |
| 1707 | assert(balloon->memslot_count > 0); |
| 1708 | |
| 1709 | return balloon->memslot_count; |
| 1710 | } |
| 1711 | |
| 1712 | static void hv_balloon_init(Object *obj) |
| 1713 | { |
| 1714 | } |
| 1715 | |
| 1716 | static void hv_balloon_finalize(Object *obj) |
| 1717 | { |
| 1718 | HvBalloon *balloon = HV_BALLOON(obj); |
| 1719 | |
| 1720 | hv_balloon_unrealize_finalize_common(balloon); |
| 1721 | } |
| 1722 | |
| 1723 | static const Property hv_balloon_properties[] = { |
| 1724 | DEFINE_PROP_BOOL("status-report", HvBalloon, |
| 1725 | status_report.enabled, false), |
| 1726 | |
| 1727 | /* MEMORY_DEVICE props */ |
| 1728 | DEFINE_PROP_LINK(HV_BALLOON_MEMDEV_PROP, HvBalloon, hostmem, |
| 1729 | TYPE_MEMORY_BACKEND, HostMemoryBackend *), |
| 1730 | DEFINE_PROP_UINT64(HV_BALLOON_ADDR_PROP, HvBalloon, addr, 0), |
| 1731 | }; |
| 1732 | |
| 1733 | static void hv_balloon_class_init(ObjectClass *klass, const void *data) |
| 1734 | { |
| 1735 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 1736 | VMBusDeviceClass *vdc = VMBUS_DEVICE_CLASS(klass); |
| 1737 | MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass); |
| 1738 | |
| 1739 | device_class_set_props(dc, hv_balloon_properties); |
| 1740 | qemu_uuid_parse(HV_BALLOON_GUID, &vdc->classid); |
| 1741 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| 1742 | |
| 1743 | vdc->vmdev_realize = hv_balloon_vmdev_realize; |
| 1744 | vdc->vmdev_unrealize = hv_balloon_vmdev_unrealize; |
| 1745 | vdc->vmdev_reset = hv_balloon_vmdev_reset; |
| 1746 | vdc->open_channel = hv_balloon_vmdev_open_channel; |
| 1747 | vdc->close_channel = hv_balloon_vmdev_close_channel; |
| 1748 | vdc->chan_notify_cb = hv_balloon_vmdev_chan_notify; |
| 1749 | |
| 1750 | mdc->get_addr = hv_balloon_md_get_addr; |
| 1751 | mdc->set_addr = hv_balloon_md_set_addr; |
| 1752 | mdc->get_plugged_size = memory_device_get_region_size; |
| 1753 | mdc->get_memory_region = hv_balloon_md_get_memory_region; |
| 1754 | mdc->decide_memslots = hv_balloon_decide_memslots; |
| 1755 | mdc->get_memslots = hv_balloon_get_memslots; |
| 1756 | mdc->get_min_alignment = hv_balloon_md_get_min_alignment; |
| 1757 | mdc->fill_device_info = hv_balloon_md_fill_device_info; |
| 1758 | } |