Jun Nakajima | 1321c76 | 2011-03-04 17:17:45 -0800 | [diff] [blame] | 1 | /* |
| 2 | * QEMU KVM support |
| 3 | * |
| 4 | * Copyright IBM, Corp. 2008 |
| 5 | * Red Hat, Inc. 2008 |
| 6 | * |
| 7 | * Authors: |
| 8 | * Anthony Liguori <aliguori@us.ibm.com> |
| 9 | * Glauber Costa <gcosta@redhat.com> |
| 10 | * |
| 11 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 12 | * See the COPYING file in the top-level directory. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <sys/types.h> |
| 17 | #include <sys/ioctl.h> |
| 18 | #include <sys/mman.h> |
| 19 | #include <stdarg.h> |
| 20 | |
| 21 | #include <linux/kvm.h> |
| 22 | |
| 23 | #include "qemu-common.h" |
| 24 | #include "sysemu.h" |
| 25 | #include "hw/hw.h" |
| 26 | #include "gdbstub.h" |
| 27 | #include "kvm.h" |
| 28 | |
| 29 | /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */ |
| 30 | #define PAGE_SIZE TARGET_PAGE_SIZE |
| 31 | |
| 32 | //#define DEBUG_KVM |
| 33 | |
| 34 | #ifdef DEBUG_KVM |
| 35 | #define dprintf(fmt, ...) \ |
| 36 | do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
| 37 | #else |
| 38 | #define dprintf(fmt, ...) \ |
| 39 | do { } while (0) |
| 40 | #endif |
| 41 | |
| 42 | typedef struct KVMSlot |
| 43 | { |
| 44 | target_phys_addr_t start_addr; |
| 45 | ram_addr_t memory_size; |
| 46 | ram_addr_t phys_offset; |
| 47 | int slot; |
| 48 | int flags; |
| 49 | } KVMSlot; |
| 50 | |
| 51 | typedef struct kvm_dirty_log KVMDirtyLog; |
| 52 | |
| 53 | int kvm_allowed = 0; |
| 54 | |
| 55 | struct KVMState |
| 56 | { |
| 57 | KVMSlot slots[32]; |
| 58 | int fd; |
| 59 | int vmfd; |
| 60 | int coalesced_mmio; |
| 61 | int broken_set_mem_region; |
| 62 | int migration_log; |
| 63 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
| 64 | struct kvm_sw_breakpoint_head kvm_sw_breakpoints; |
| 65 | #endif |
| 66 | }; |
| 67 | |
| 68 | static KVMState *kvm_state; |
| 69 | |
| 70 | static KVMSlot *kvm_alloc_slot(KVMState *s) |
| 71 | { |
| 72 | int i; |
| 73 | |
| 74 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
| 75 | /* KVM private memory slots */ |
| 76 | if (i >= 8 && i < 12) |
| 77 | continue; |
| 78 | if (s->slots[i].memory_size == 0) |
| 79 | return &s->slots[i]; |
| 80 | } |
| 81 | |
| 82 | fprintf(stderr, "%s: no free slot available\n", __func__); |
| 83 | abort(); |
| 84 | } |
| 85 | |
| 86 | static KVMSlot *kvm_lookup_matching_slot(KVMState *s, |
| 87 | target_phys_addr_t start_addr, |
| 88 | target_phys_addr_t end_addr) |
| 89 | { |
| 90 | int i; |
| 91 | |
| 92 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
| 93 | KVMSlot *mem = &s->slots[i]; |
| 94 | |
| 95 | if (start_addr == mem->start_addr && |
| 96 | end_addr == mem->start_addr + mem->memory_size) { |
| 97 | return mem; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | return NULL; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Find overlapping slot with lowest start address |
| 106 | */ |
| 107 | static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s, |
| 108 | target_phys_addr_t start_addr, |
| 109 | target_phys_addr_t end_addr) |
| 110 | { |
| 111 | KVMSlot *found = NULL; |
| 112 | int i; |
| 113 | |
| 114 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
| 115 | KVMSlot *mem = &s->slots[i]; |
| 116 | |
| 117 | if (mem->memory_size == 0 || |
| 118 | (found && found->start_addr < mem->start_addr)) { |
| 119 | continue; |
| 120 | } |
| 121 | |
| 122 | if (end_addr > mem->start_addr && |
| 123 | start_addr < mem->start_addr + mem->memory_size) { |
| 124 | found = mem; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | return found; |
| 129 | } |
| 130 | |
| 131 | static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot) |
| 132 | { |
| 133 | struct kvm_userspace_memory_region mem; |
| 134 | |
| 135 | mem.slot = slot->slot; |
| 136 | mem.guest_phys_addr = slot->start_addr; |
| 137 | mem.memory_size = slot->memory_size; |
| 138 | mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset); |
| 139 | mem.flags = slot->flags; |
| 140 | if (s->migration_log) { |
| 141 | mem.flags |= KVM_MEM_LOG_DIRTY_PAGES; |
| 142 | } |
| 143 | return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); |
| 144 | } |
| 145 | |
| 146 | |
| 147 | int kvm_init_vcpu(CPUState *env) |
| 148 | { |
| 149 | KVMState *s = kvm_state; |
| 150 | long mmap_size; |
| 151 | int ret; |
| 152 | |
| 153 | dprintf("kvm_init_vcpu\n"); |
| 154 | |
| 155 | ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index); |
| 156 | if (ret < 0) { |
| 157 | dprintf("kvm_create_vcpu failed\n"); |
| 158 | goto err; |
| 159 | } |
| 160 | |
| 161 | env->kvm_fd = ret; |
| 162 | env->kvm_state = s; |
| 163 | |
| 164 | mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); |
| 165 | if (mmap_size < 0) { |
| 166 | dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n"); |
| 167 | goto err; |
| 168 | } |
| 169 | |
| 170 | env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, |
| 171 | env->kvm_fd, 0); |
| 172 | if (env->kvm_run == MAP_FAILED) { |
| 173 | ret = -errno; |
| 174 | dprintf("mmap'ing vcpu state failed\n"); |
| 175 | goto err; |
| 176 | } |
| 177 | |
| 178 | ret = kvm_arch_init_vcpu(env); |
| 179 | |
| 180 | err: |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | int kvm_put_mp_state(CPUState *env) |
| 185 | { |
| 186 | struct kvm_mp_state mp_state = { .mp_state = env->mp_state }; |
| 187 | |
| 188 | return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state); |
| 189 | } |
| 190 | |
| 191 | int kvm_get_mp_state(CPUState *env) |
| 192 | { |
| 193 | struct kvm_mp_state mp_state; |
| 194 | int ret; |
| 195 | |
| 196 | ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state); |
| 197 | if (ret < 0) { |
| 198 | return ret; |
| 199 | } |
| 200 | env->mp_state = mp_state.mp_state; |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | int kvm_sync_vcpus(void) |
| 205 | { |
| 206 | CPUState *env; |
| 207 | |
| 208 | for (env = first_cpu; env != NULL; env = env->next_cpu) { |
| 209 | int ret; |
| 210 | |
| 211 | ret = kvm_arch_put_registers(env); |
| 212 | if (ret) |
| 213 | return ret; |
| 214 | } |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * dirty pages logging control |
| 221 | */ |
| 222 | static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, |
| 223 | ram_addr_t size, int flags, int mask) |
| 224 | { |
| 225 | KVMState *s = kvm_state; |
| 226 | KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size); |
| 227 | int old_flags; |
| 228 | |
| 229 | if (mem == NULL) { |
| 230 | fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
| 231 | TARGET_FMT_plx "\n", __func__, phys_addr, |
| 232 | phys_addr + size - 1); |
| 233 | return -EINVAL; |
| 234 | } |
| 235 | |
| 236 | old_flags = mem->flags; |
| 237 | |
| 238 | flags = (mem->flags & ~mask) | flags; |
| 239 | mem->flags = flags; |
| 240 | |
| 241 | /* If nothing changed effectively, no need to issue ioctl */ |
| 242 | if (s->migration_log) { |
| 243 | flags |= KVM_MEM_LOG_DIRTY_PAGES; |
| 244 | } |
| 245 | if (flags == old_flags) { |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | return kvm_set_user_memory_region(s, mem); |
| 250 | } |
| 251 | |
| 252 | int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size) |
| 253 | { |
| 254 | return kvm_dirty_pages_log_change(phys_addr, size, |
| 255 | KVM_MEM_LOG_DIRTY_PAGES, |
| 256 | KVM_MEM_LOG_DIRTY_PAGES); |
| 257 | } |
| 258 | |
| 259 | int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size) |
| 260 | { |
| 261 | return kvm_dirty_pages_log_change(phys_addr, size, |
| 262 | 0, |
| 263 | KVM_MEM_LOG_DIRTY_PAGES); |
| 264 | } |
| 265 | |
| 266 | int kvm_set_migration_log(int enable) |
| 267 | { |
| 268 | KVMState *s = kvm_state; |
| 269 | KVMSlot *mem; |
| 270 | int i, err; |
| 271 | |
| 272 | s->migration_log = enable; |
| 273 | |
| 274 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
| 275 | mem = &s->slots[i]; |
| 276 | |
| 277 | if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) { |
| 278 | continue; |
| 279 | } |
| 280 | err = kvm_set_user_memory_region(s, mem); |
| 281 | if (err) { |
| 282 | return err; |
| 283 | } |
| 284 | } |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | /** |
| 289 | * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space |
| 290 | * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty(). |
| 291 | * This means all bits are set to dirty. |
| 292 | * |
| 293 | * @start_add: start of logged region. |
| 294 | * @end_addr: end of logged region. |
| 295 | */ |
| 296 | int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, |
| 297 | target_phys_addr_t end_addr) |
| 298 | { |
| 299 | KVMState *s = kvm_state; |
| 300 | unsigned long size, allocated_size = 0; |
| 301 | target_phys_addr_t phys_addr; |
| 302 | ram_addr_t addr; |
| 303 | KVMDirtyLog d; |
| 304 | KVMSlot *mem; |
| 305 | int ret = 0; |
| 306 | |
| 307 | d.dirty_bitmap = NULL; |
| 308 | while (start_addr < end_addr) { |
| 309 | mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); |
| 310 | if (mem == NULL) { |
| 311 | break; |
| 312 | } |
| 313 | |
| 314 | size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
| 315 | if (!d.dirty_bitmap) { |
| 316 | d.dirty_bitmap = qemu_malloc(size); |
| 317 | } else if (size > allocated_size) { |
| 318 | d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); |
| 319 | } |
| 320 | allocated_size = size; |
| 321 | memset(d.dirty_bitmap, 0, allocated_size); |
| 322 | |
| 323 | d.slot = mem->slot; |
| 324 | |
| 325 | if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
| 326 | dprintf("ioctl failed %d\n", errno); |
| 327 | ret = -1; |
| 328 | break; |
| 329 | } |
| 330 | |
| 331 | for (phys_addr = mem->start_addr, addr = mem->phys_offset; |
| 332 | phys_addr < mem->start_addr + mem->memory_size; |
| 333 | phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { |
| 334 | unsigned long *bitmap = (unsigned long *)d.dirty_bitmap; |
| 335 | unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS; |
| 336 | unsigned word = nr / (sizeof(*bitmap) * 8); |
| 337 | unsigned bit = nr % (sizeof(*bitmap) * 8); |
| 338 | |
| 339 | if ((bitmap[word] >> bit) & 1) { |
| 340 | cpu_physical_memory_set_dirty(addr); |
| 341 | } |
| 342 | } |
| 343 | start_addr = phys_addr; |
| 344 | } |
| 345 | qemu_free(d.dirty_bitmap); |
| 346 | |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) |
| 351 | { |
| 352 | int ret = -ENOSYS; |
| 353 | #ifdef KVM_CAP_COALESCED_MMIO |
| 354 | KVMState *s = kvm_state; |
| 355 | |
| 356 | if (s->coalesced_mmio) { |
| 357 | struct kvm_coalesced_mmio_zone zone; |
| 358 | |
| 359 | zone.addr = start; |
| 360 | zone.size = size; |
| 361 | |
| 362 | ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); |
| 363 | } |
| 364 | #endif |
| 365 | |
| 366 | return ret; |
| 367 | } |
| 368 | |
| 369 | int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) |
| 370 | { |
| 371 | int ret = -ENOSYS; |
| 372 | #ifdef KVM_CAP_COALESCED_MMIO |
| 373 | KVMState *s = kvm_state; |
| 374 | |
| 375 | if (s->coalesced_mmio) { |
| 376 | struct kvm_coalesced_mmio_zone zone; |
| 377 | |
| 378 | zone.addr = start; |
| 379 | zone.size = size; |
| 380 | |
| 381 | ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); |
| 382 | } |
| 383 | #endif |
| 384 | |
| 385 | return ret; |
| 386 | } |
| 387 | |
| 388 | int kvm_check_extension(KVMState *s, unsigned int extension) |
| 389 | { |
| 390 | int ret; |
| 391 | |
| 392 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); |
| 393 | if (ret < 0) { |
| 394 | ret = 0; |
| 395 | } |
| 396 | |
| 397 | return ret; |
| 398 | } |
| 399 | |
| 400 | static void kvm_reset_vcpus(void *opaque) |
| 401 | { |
| 402 | kvm_sync_vcpus(); |
| 403 | } |
| 404 | |
| 405 | int kvm_init(int smp_cpus) |
| 406 | { |
| 407 | static const char upgrade_note[] = |
| 408 | "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n" |
| 409 | "(see http://sourceforge.net/projects/kvm).\n"; |
| 410 | KVMState *s; |
| 411 | int ret; |
| 412 | int i; |
| 413 | |
| 414 | if (smp_cpus > 1) { |
| 415 | fprintf(stderr, "No SMP KVM support, use '-smp 1'\n"); |
| 416 | return -EINVAL; |
| 417 | } |
| 418 | |
| 419 | s = qemu_mallocz(sizeof(KVMState)); |
| 420 | |
| 421 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
| 422 | QTAILQ_INIT(&s->kvm_sw_breakpoints); |
| 423 | #endif |
| 424 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
| 425 | s->slots[i].slot = i; |
| 426 | |
| 427 | s->vmfd = -1; |
| 428 | s->fd = open("/dev/kvm", O_RDWR); |
| 429 | if (s->fd == -1) { |
| 430 | fprintf(stderr, "Could not access KVM kernel module: %m\n"); |
| 431 | ret = -errno; |
| 432 | goto err; |
| 433 | } |
| 434 | |
| 435 | ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); |
| 436 | if (ret < KVM_API_VERSION) { |
| 437 | if (ret > 0) |
| 438 | ret = -EINVAL; |
| 439 | fprintf(stderr, "kvm version too old\n"); |
| 440 | goto err; |
| 441 | } |
| 442 | |
| 443 | if (ret > KVM_API_VERSION) { |
| 444 | ret = -EINVAL; |
| 445 | fprintf(stderr, "kvm version not supported\n"); |
| 446 | goto err; |
| 447 | } |
| 448 | |
| 449 | s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0); |
| 450 | if (s->vmfd < 0) |
| 451 | goto err; |
| 452 | |
| 453 | /* initially, KVM allocated its own memory and we had to jump through |
| 454 | * hooks to make phys_ram_base point to this. Modern versions of KVM |
| 455 | * just use a user allocated buffer so we can use regular pages |
| 456 | * unmodified. Make sure we have a sufficiently modern version of KVM. |
| 457 | */ |
| 458 | if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) { |
| 459 | ret = -EINVAL; |
| 460 | fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s", |
| 461 | upgrade_note); |
| 462 | goto err; |
| 463 | } |
| 464 | |
| 465 | /* There was a nasty bug in < kvm-80 that prevents memory slots from being |
| 466 | * destroyed properly. Since we rely on this capability, refuse to work |
| 467 | * with any kernel without this capability. */ |
| 468 | if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) { |
| 469 | ret = -EINVAL; |
| 470 | |
| 471 | fprintf(stderr, |
| 472 | "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s", |
| 473 | upgrade_note); |
| 474 | goto err; |
| 475 | } |
| 476 | |
| 477 | #ifdef KVM_CAP_COALESCED_MMIO |
| 478 | s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
| 479 | #else |
| 480 | s->coalesced_mmio = 0; |
| 481 | #endif |
| 482 | |
| 483 | s->broken_set_mem_region = 1; |
| 484 | #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS |
| 485 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); |
| 486 | if (ret > 0) { |
| 487 | s->broken_set_mem_region = 0; |
| 488 | } |
| 489 | #endif |
| 490 | |
| 491 | ret = kvm_arch_init(s, smp_cpus); |
| 492 | if (ret < 0) |
| 493 | goto err; |
| 494 | |
| 495 | qemu_register_reset(kvm_reset_vcpus, INT_MAX, NULL); |
| 496 | |
| 497 | kvm_state = s; |
| 498 | |
| 499 | return 0; |
| 500 | |
| 501 | err: |
| 502 | if (s) { |
| 503 | if (s->vmfd != -1) |
| 504 | close(s->vmfd); |
| 505 | if (s->fd != -1) |
| 506 | close(s->fd); |
| 507 | } |
| 508 | qemu_free(s); |
| 509 | |
| 510 | return ret; |
| 511 | } |
| 512 | |
| 513 | static int kvm_handle_io(CPUState *env, uint16_t port, void *data, |
| 514 | int direction, int size, uint32_t count) |
| 515 | { |
| 516 | int i; |
| 517 | uint8_t *ptr = data; |
| 518 | |
| 519 | for (i = 0; i < count; i++) { |
| 520 | if (direction == KVM_EXIT_IO_IN) { |
| 521 | switch (size) { |
| 522 | case 1: |
| 523 | stb_p(ptr, cpu_inb(port)); |
| 524 | break; |
| 525 | case 2: |
| 526 | stw_p(ptr, cpu_inw(port)); |
| 527 | break; |
| 528 | case 4: |
| 529 | stl_p(ptr, cpu_inl(port)); |
| 530 | break; |
| 531 | } |
| 532 | } else { |
| 533 | switch (size) { |
| 534 | case 1: |
| 535 | cpu_outb(port, ldub_p(ptr)); |
| 536 | break; |
| 537 | case 2: |
| 538 | cpu_outw(port, lduw_p(ptr)); |
| 539 | break; |
| 540 | case 4: |
| 541 | cpu_outl(port, ldl_p(ptr)); |
| 542 | break; |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | ptr += size; |
| 547 | } |
| 548 | |
| 549 | return 1; |
| 550 | } |
| 551 | |
| 552 | static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
| 553 | { |
| 554 | #ifdef KVM_CAP_COALESCED_MMIO |
| 555 | KVMState *s = kvm_state; |
| 556 | if (s->coalesced_mmio) { |
| 557 | struct kvm_coalesced_mmio_ring *ring; |
| 558 | |
| 559 | ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE); |
| 560 | while (ring->first != ring->last) { |
| 561 | struct kvm_coalesced_mmio *ent; |
| 562 | |
| 563 | ent = &ring->coalesced_mmio[ring->first]; |
| 564 | |
| 565 | cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); |
| 566 | /* FIXME smp_wmb() */ |
| 567 | ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX; |
| 568 | } |
| 569 | } |
| 570 | #endif |
| 571 | } |
| 572 | |
| 573 | int kvm_cpu_exec(CPUState *env) |
| 574 | { |
| 575 | struct kvm_run *run = env->kvm_run; |
| 576 | int ret; |
| 577 | |
| 578 | dprintf("kvm_cpu_exec()\n"); |
| 579 | |
| 580 | do { |
| 581 | if (env->exit_request) { |
| 582 | dprintf("interrupt exit requested\n"); |
| 583 | ret = 0; |
| 584 | break; |
| 585 | } |
| 586 | |
| 587 | kvm_arch_pre_run(env, run); |
| 588 | ret = kvm_vcpu_ioctl(env, KVM_RUN, 0); |
| 589 | kvm_arch_post_run(env, run); |
| 590 | |
| 591 | if (ret == -EINTR || ret == -EAGAIN) { |
| 592 | dprintf("io window exit\n"); |
| 593 | ret = 0; |
| 594 | break; |
| 595 | } |
| 596 | |
| 597 | if (ret < 0) { |
| 598 | dprintf("kvm run failed %s\n", strerror(-ret)); |
| 599 | abort(); |
| 600 | } |
| 601 | |
| 602 | kvm_run_coalesced_mmio(env, run); |
| 603 | |
| 604 | ret = 0; /* exit loop */ |
| 605 | switch (run->exit_reason) { |
| 606 | case KVM_EXIT_IO: |
| 607 | dprintf("handle_io\n"); |
| 608 | ret = kvm_handle_io(env, run->io.port, |
| 609 | (uint8_t *)run + run->io.data_offset, |
| 610 | run->io.direction, |
| 611 | run->io.size, |
| 612 | run->io.count); |
| 613 | break; |
| 614 | case KVM_EXIT_MMIO: |
| 615 | dprintf("handle_mmio\n"); |
| 616 | cpu_physical_memory_rw(run->mmio.phys_addr, |
| 617 | run->mmio.data, |
| 618 | run->mmio.len, |
| 619 | run->mmio.is_write); |
| 620 | ret = 1; |
| 621 | break; |
| 622 | case KVM_EXIT_IRQ_WINDOW_OPEN: |
| 623 | dprintf("irq_window_open\n"); |
| 624 | break; |
| 625 | case KVM_EXIT_SHUTDOWN: |
| 626 | dprintf("shutdown\n"); |
| 627 | qemu_system_reset_request(); |
| 628 | ret = 1; |
| 629 | break; |
| 630 | case KVM_EXIT_UNKNOWN: |
| 631 | dprintf("kvm_exit_unknown\n"); |
| 632 | break; |
| 633 | case KVM_EXIT_FAIL_ENTRY: |
| 634 | dprintf("kvm_exit_fail_entry\n"); |
| 635 | break; |
| 636 | case KVM_EXIT_EXCEPTION: |
| 637 | dprintf("kvm_exit_exception\n"); |
| 638 | break; |
| 639 | case KVM_EXIT_DEBUG: |
| 640 | dprintf("kvm_exit_debug\n"); |
| 641 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
| 642 | if (kvm_arch_debug(&run->debug.arch)) { |
| 643 | gdb_set_stop_cpu(env); |
| 644 | vm_stop(EXCP_DEBUG); |
| 645 | env->exception_index = EXCP_DEBUG; |
| 646 | return 0; |
| 647 | } |
| 648 | /* re-enter, this exception was guest-internal */ |
| 649 | ret = 1; |
| 650 | #endif /* KVM_CAP_SET_GUEST_DEBUG */ |
| 651 | break; |
| 652 | default: |
| 653 | dprintf("kvm_arch_handle_exit\n"); |
| 654 | ret = kvm_arch_handle_exit(env, run); |
| 655 | break; |
| 656 | } |
| 657 | } while (ret > 0); |
| 658 | |
| 659 | if (env->exit_request) { |
| 660 | env->exit_request = 0; |
| 661 | env->exception_index = EXCP_INTERRUPT; |
| 662 | } |
| 663 | |
| 664 | return ret; |
| 665 | } |
| 666 | |
| 667 | void kvm_set_phys_mem(target_phys_addr_t start_addr, |
| 668 | ram_addr_t size, |
| 669 | ram_addr_t phys_offset) |
| 670 | { |
| 671 | KVMState *s = kvm_state; |
| 672 | ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
| 673 | KVMSlot *mem, old; |
| 674 | int err; |
| 675 | |
| 676 | if (start_addr & ~TARGET_PAGE_MASK) { |
| 677 | if (flags >= IO_MEM_UNASSIGNED) { |
| 678 | if (!kvm_lookup_overlapping_slot(s, start_addr, |
| 679 | start_addr + size)) { |
| 680 | return; |
| 681 | } |
| 682 | fprintf(stderr, "Unaligned split of a KVM memory slot\n"); |
| 683 | } else { |
| 684 | fprintf(stderr, "Only page-aligned memory slots supported\n"); |
| 685 | } |
| 686 | abort(); |
| 687 | } |
| 688 | |
| 689 | /* KVM does not support read-only slots */ |
| 690 | phys_offset &= ~IO_MEM_ROM; |
| 691 | |
| 692 | while (1) { |
| 693 | mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); |
| 694 | if (!mem) { |
| 695 | break; |
| 696 | } |
| 697 | |
| 698 | if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr && |
| 699 | (start_addr + size <= mem->start_addr + mem->memory_size) && |
| 700 | (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { |
| 701 | /* The new slot fits into the existing one and comes with |
| 702 | * identical parameters - nothing to be done. */ |
| 703 | return; |
| 704 | } |
| 705 | |
| 706 | old = *mem; |
| 707 | |
| 708 | /* unregister the overlapping slot */ |
| 709 | mem->memory_size = 0; |
| 710 | err = kvm_set_user_memory_region(s, mem); |
| 711 | if (err) { |
| 712 | fprintf(stderr, "%s: error unregistering overlapping slot: %s\n", |
| 713 | __func__, strerror(-err)); |
| 714 | abort(); |
| 715 | } |
| 716 | |
| 717 | /* Workaround for older KVM versions: we can't join slots, even not by |
| 718 | * unregistering the previous ones and then registering the larger |
| 719 | * slot. We have to maintain the existing fragmentation. Sigh. |
| 720 | * |
| 721 | * This workaround assumes that the new slot starts at the same |
| 722 | * address as the first existing one. If not or if some overlapping |
| 723 | * slot comes around later, we will fail (not seen in practice so far) |
| 724 | * - and actually require a recent KVM version. */ |
| 725 | if (s->broken_set_mem_region && |
| 726 | old.start_addr == start_addr && old.memory_size < size && |
| 727 | flags < IO_MEM_UNASSIGNED) { |
| 728 | mem = kvm_alloc_slot(s); |
| 729 | mem->memory_size = old.memory_size; |
| 730 | mem->start_addr = old.start_addr; |
| 731 | mem->phys_offset = old.phys_offset; |
| 732 | mem->flags = 0; |
| 733 | |
| 734 | err = kvm_set_user_memory_region(s, mem); |
| 735 | if (err) { |
| 736 | fprintf(stderr, "%s: error updating slot: %s\n", __func__, |
| 737 | strerror(-err)); |
| 738 | abort(); |
| 739 | } |
| 740 | |
| 741 | start_addr += old.memory_size; |
| 742 | phys_offset += old.memory_size; |
| 743 | size -= old.memory_size; |
| 744 | continue; |
| 745 | } |
| 746 | |
| 747 | /* register prefix slot */ |
| 748 | if (old.start_addr < start_addr) { |
| 749 | mem = kvm_alloc_slot(s); |
| 750 | mem->memory_size = start_addr - old.start_addr; |
| 751 | mem->start_addr = old.start_addr; |
| 752 | mem->phys_offset = old.phys_offset; |
| 753 | mem->flags = 0; |
| 754 | |
| 755 | err = kvm_set_user_memory_region(s, mem); |
| 756 | if (err) { |
| 757 | fprintf(stderr, "%s: error registering prefix slot: %s\n", |
| 758 | __func__, strerror(-err)); |
| 759 | abort(); |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | /* register suffix slot */ |
| 764 | if (old.start_addr + old.memory_size > start_addr + size) { |
| 765 | ram_addr_t size_delta; |
| 766 | |
| 767 | mem = kvm_alloc_slot(s); |
| 768 | mem->start_addr = start_addr + size; |
| 769 | size_delta = mem->start_addr - old.start_addr; |
| 770 | mem->memory_size = old.memory_size - size_delta; |
| 771 | mem->phys_offset = old.phys_offset + size_delta; |
| 772 | mem->flags = 0; |
| 773 | |
| 774 | err = kvm_set_user_memory_region(s, mem); |
| 775 | if (err) { |
| 776 | fprintf(stderr, "%s: error registering suffix slot: %s\n", |
| 777 | __func__, strerror(-err)); |
| 778 | abort(); |
| 779 | } |
| 780 | } |
| 781 | } |
| 782 | |
| 783 | /* in case the KVM bug workaround already "consumed" the new slot */ |
| 784 | if (!size) |
| 785 | return; |
| 786 | |
| 787 | /* KVM does not need to know about this memory */ |
| 788 | if (flags >= IO_MEM_UNASSIGNED) |
| 789 | return; |
| 790 | |
| 791 | mem = kvm_alloc_slot(s); |
| 792 | mem->memory_size = size; |
| 793 | mem->start_addr = start_addr; |
| 794 | mem->phys_offset = phys_offset; |
| 795 | mem->flags = 0; |
| 796 | |
| 797 | err = kvm_set_user_memory_region(s, mem); |
| 798 | if (err) { |
| 799 | fprintf(stderr, "%s: error registering slot: %s\n", __func__, |
| 800 | strerror(-err)); |
| 801 | abort(); |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | int kvm_ioctl(KVMState *s, int type, ...) |
| 806 | { |
| 807 | int ret; |
| 808 | void *arg; |
| 809 | va_list ap; |
| 810 | |
| 811 | va_start(ap, type); |
| 812 | arg = va_arg(ap, void *); |
| 813 | va_end(ap); |
| 814 | |
| 815 | ret = ioctl(s->fd, type, arg); |
| 816 | if (ret == -1) |
| 817 | ret = -errno; |
| 818 | |
| 819 | return ret; |
| 820 | } |
| 821 | |
| 822 | int kvm_vm_ioctl(KVMState *s, int type, ...) |
| 823 | { |
| 824 | int ret; |
| 825 | void *arg; |
| 826 | va_list ap; |
| 827 | |
| 828 | va_start(ap, type); |
| 829 | arg = va_arg(ap, void *); |
| 830 | va_end(ap); |
| 831 | |
| 832 | ret = ioctl(s->vmfd, type, arg); |
| 833 | if (ret == -1) |
| 834 | ret = -errno; |
| 835 | |
| 836 | return ret; |
| 837 | } |
| 838 | |
| 839 | int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
| 840 | { |
| 841 | int ret; |
| 842 | void *arg; |
| 843 | va_list ap; |
| 844 | |
| 845 | va_start(ap, type); |
| 846 | arg = va_arg(ap, void *); |
| 847 | va_end(ap); |
| 848 | |
| 849 | ret = ioctl(env->kvm_fd, type, arg); |
| 850 | if (ret == -1) |
| 851 | ret = -errno; |
| 852 | |
| 853 | return ret; |
| 854 | } |
| 855 | |
| 856 | int kvm_has_sync_mmu(void) |
| 857 | { |
| 858 | #ifdef KVM_CAP_SYNC_MMU |
| 859 | KVMState *s = kvm_state; |
| 860 | |
| 861 | return kvm_check_extension(s, KVM_CAP_SYNC_MMU); |
| 862 | #else |
| 863 | return 0; |
| 864 | #endif |
| 865 | } |
| 866 | |
| 867 | void kvm_setup_guest_memory(void *start, size_t size) |
| 868 | { |
| 869 | if (!kvm_has_sync_mmu()) { |
| 870 | #ifdef MADV_DONTFORK |
| 871 | int ret = madvise(start, size, MADV_DONTFORK); |
| 872 | |
| 873 | if (ret) { |
| 874 | perror("madvice"); |
| 875 | exit(1); |
| 876 | } |
| 877 | #else |
| 878 | fprintf(stderr, |
| 879 | "Need MADV_DONTFORK in absence of synchronous KVM MMU\n"); |
| 880 | exit(1); |
| 881 | #endif |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
| 886 | struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env, |
| 887 | target_ulong pc) |
| 888 | { |
| 889 | struct kvm_sw_breakpoint *bp; |
| 890 | |
| 891 | QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { |
| 892 | if (bp->pc == pc) |
| 893 | return bp; |
| 894 | } |
| 895 | return NULL; |
| 896 | } |
| 897 | |
| 898 | int kvm_sw_breakpoints_active(CPUState *env) |
| 899 | { |
| 900 | return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints); |
| 901 | } |
| 902 | |
| 903 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
| 904 | { |
| 905 | struct kvm_guest_debug dbg; |
| 906 | |
| 907 | dbg.control = 0; |
| 908 | if (env->singlestep_enabled) |
| 909 | dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; |
| 910 | |
| 911 | kvm_arch_update_guest_debug(env, &dbg); |
| 912 | dbg.control |= reinject_trap; |
| 913 | |
| 914 | return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg); |
| 915 | } |
| 916 | |
| 917 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, |
| 918 | target_ulong len, int type) |
| 919 | { |
| 920 | struct kvm_sw_breakpoint *bp; |
| 921 | CPUState *env; |
| 922 | int err; |
| 923 | |
| 924 | if (type == GDB_BREAKPOINT_SW) { |
| 925 | bp = kvm_find_sw_breakpoint(current_env, addr); |
| 926 | if (bp) { |
| 927 | bp->use_count++; |
| 928 | return 0; |
| 929 | } |
| 930 | |
| 931 | bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); |
| 932 | if (!bp) |
| 933 | return -ENOMEM; |
| 934 | |
| 935 | bp->pc = addr; |
| 936 | bp->use_count = 1; |
| 937 | err = kvm_arch_insert_sw_breakpoint(current_env, bp); |
| 938 | if (err) { |
| 939 | free(bp); |
| 940 | return err; |
| 941 | } |
| 942 | |
| 943 | QTAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, |
| 944 | bp, entry); |
| 945 | } else { |
| 946 | err = kvm_arch_insert_hw_breakpoint(addr, len, type); |
| 947 | if (err) |
| 948 | return err; |
| 949 | } |
| 950 | |
| 951 | for (env = first_cpu; env != NULL; env = env->next_cpu) { |
| 952 | err = kvm_update_guest_debug(env, 0); |
| 953 | if (err) |
| 954 | return err; |
| 955 | } |
| 956 | return 0; |
| 957 | } |
| 958 | |
| 959 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, |
| 960 | target_ulong len, int type) |
| 961 | { |
| 962 | struct kvm_sw_breakpoint *bp; |
| 963 | CPUState *env; |
| 964 | int err; |
| 965 | |
| 966 | if (type == GDB_BREAKPOINT_SW) { |
| 967 | bp = kvm_find_sw_breakpoint(current_env, addr); |
| 968 | if (!bp) |
| 969 | return -ENOENT; |
| 970 | |
| 971 | if (bp->use_count > 1) { |
| 972 | bp->use_count--; |
| 973 | return 0; |
| 974 | } |
| 975 | |
| 976 | err = kvm_arch_remove_sw_breakpoint(current_env, bp); |
| 977 | if (err) |
| 978 | return err; |
| 979 | |
| 980 | QTAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); |
| 981 | qemu_free(bp); |
| 982 | } else { |
| 983 | err = kvm_arch_remove_hw_breakpoint(addr, len, type); |
| 984 | if (err) |
| 985 | return err; |
| 986 | } |
| 987 | |
| 988 | for (env = first_cpu; env != NULL; env = env->next_cpu) { |
| 989 | err = kvm_update_guest_debug(env, 0); |
| 990 | if (err) |
| 991 | return err; |
| 992 | } |
| 993 | return 0; |
| 994 | } |
| 995 | |
| 996 | void kvm_remove_all_breakpoints(CPUState *current_env) |
| 997 | { |
| 998 | struct kvm_sw_breakpoint *bp, *next; |
| 999 | KVMState *s = current_env->kvm_state; |
| 1000 | CPUState *env; |
| 1001 | |
| 1002 | QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { |
| 1003 | if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { |
| 1004 | /* Try harder to find a CPU that currently sees the breakpoint. */ |
| 1005 | for (env = first_cpu; env != NULL; env = env->next_cpu) { |
| 1006 | if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) |
| 1007 | break; |
| 1008 | } |
| 1009 | } |
| 1010 | } |
| 1011 | kvm_arch_remove_all_hw_breakpoints(); |
| 1012 | |
| 1013 | for (env = first_cpu; env != NULL; env = env->next_cpu) |
| 1014 | kvm_update_guest_debug(env, 0); |
| 1015 | } |
| 1016 | |
| 1017 | #else /* !KVM_CAP_SET_GUEST_DEBUG */ |
| 1018 | |
| 1019 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
| 1020 | { |
| 1021 | return -EINVAL; |
| 1022 | } |
| 1023 | |
| 1024 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, |
| 1025 | target_ulong len, int type) |
| 1026 | { |
| 1027 | return -EINVAL; |
| 1028 | } |
| 1029 | |
| 1030 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, |
| 1031 | target_ulong len, int type) |
| 1032 | { |
| 1033 | return -EINVAL; |
| 1034 | } |
| 1035 | |
| 1036 | void kvm_remove_all_breakpoints(CPUState *current_env) |
| 1037 | { |
| 1038 | } |
| 1039 | #endif /* !KVM_CAP_SET_GUEST_DEBUG */ |