kvm-all.c

   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 #ifdef KVM_UPSTREAM
  30 /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */
  31 #define PAGE_SIZE TARGET_PAGE_SIZE
  32
  33 //#define DEBUG_KVM
  34
  35 #ifdef DEBUG_KVM
  36 #define dprintf(fmt, ...) \
  37     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  38 #else
  39 #define dprintf(fmt, ...) \
  40     do { } while (0)
  41 #endif
  42
  43 typedef struct KVMSlot
  44 {
  45     target_phys_addr_t start_addr;
  46     ram_addr_t memory_size;
  47     ram_addr_t phys_offset;
  48     int slot;
  49     int flags;
  50 } KVMSlot;
  51
  52 typedef struct kvm_dirty_log KVMDirtyLog;
  53
  54 int kvm_allowed = 0;
  55
  56 struct KVMState
  57 {
  58     KVMSlot slots[32];
  59     int fd;
  60     int vmfd;
  61     int coalesced_mmio;
  62     int broken_set_mem_region;
  63     int migration_log;
  64 #ifdef KVM_CAP_SET_GUEST_DEBUG
  65     struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
  66 #endif
  67     int irqchip_in_kernel;
  68     int pit_in_kernel;
  69 };
  70
  71 static KVMState *kvm_state;
  72
  73 static KVMSlot *kvm_alloc_slot(KVMState *s)
  74 {
  75     int i;
  76
  77     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
  78         /* KVM private memory slots */
  79         if (i >= 8 && i < 12)
  80             continue;
  81         if (s->slots[i].memory_size == 0)
  82             return &s->slots[i];
  83     }
  84
  85     fprintf(stderr, "%s: no free slot available\n", __func__);
  86     abort();
  87 }
  88
  89 static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
  90                                          target_phys_addr_t start_addr,
  91                                          target_phys_addr_t end_addr)
  92 {
  93     int i;
  94
  95     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
  96         KVMSlot *mem = &s->slots[i];
  97
  98         if (start_addr == mem->start_addr &&
  99             end_addr == mem->start_addr + mem->memory_size) {
 100             return mem;
 101         }
 102     }
 103
 104     return NULL;
 105 }
 106
 107 /*
 108  * Find overlapping slot with lowest start address
 109  */
 110 static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s,
 111                                             target_phys_addr_t start_addr,
 112                                             target_phys_addr_t end_addr)
 113 {
 114     KVMSlot *found = NULL;
 115     int i;
 116
 117     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 118         KVMSlot *mem = &s->slots[i];
 119
 120         if (mem->memory_size == 0 ||
 121             (found && found->start_addr < mem->start_addr)) {
 122             continue;
 123         }
 124
 125         if (end_addr > mem->start_addr &&
 126             start_addr < mem->start_addr + mem->memory_size) {
 127             found = mem;
 128         }
 129     }
 130
 131     return found;
 132 }
 133
 134 static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
 135 {
 136     struct kvm_userspace_memory_region mem;
 137
 138     mem.slot = slot->slot;
 139     mem.guest_phys_addr = slot->start_addr;
 140     mem.memory_size = slot->memory_size;
 141     mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset);
 142     mem.flags = slot->flags;
 143     if (s->migration_log) {
 144         mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;
 145     }
 146     return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
 147 }
 148
 149 static void kvm_reset_vcpu(void *opaque)
 150 {
 151     CPUState *env = opaque;
 152
 153     if (kvm_arch_put_registers(env)) {
 154         fprintf(stderr, "Fatal: kvm vcpu reset failed\n");
 155         abort();
 156     }
 157 }
 158
 159 int kvm_irqchip_in_kernel(void)
 160 {
 161     return kvm_state->irqchip_in_kernel;
 162 }
 163
 164 int kvm_pit_in_kernel(void)
 165 {
 166     return kvm_state->pit_in_kernel;
 167 }
 168
 169
 170 int kvm_init_vcpu(CPUState *env)
 171 {
 172     KVMState *s = kvm_state;
 173     long mmap_size;
 174     int ret;
 175
 176     dprintf("kvm_init_vcpu\n");
 177
 178     ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
 179     if (ret < 0) {
 180         dprintf("kvm_create_vcpu failed\n");
 181         goto err;
 182     }
 183
 184     env->kvm_fd = ret;
 185     env->kvm_state = s;
 186
 187     mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
 188     if (mmap_size < 0) {
 189         dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n");
 190         goto err;
 191     }
 192
 193     env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
 194                         env->kvm_fd, 0);
 195     if (env->kvm_run == MAP_FAILED) {
 196         ret = -errno;
 197         dprintf("mmap'ing vcpu state failed\n");
 198         goto err;
 199     }
 200
 201     ret = kvm_arch_init_vcpu(env);
 202     if (ret == 0) {
 203         qemu_register_reset(kvm_reset_vcpu, env);
 204         ret = kvm_arch_put_registers(env);
 205     }
 206 err:
 207     return ret;
 208 }
 209
 210 int kvm_put_mp_state(CPUState *env)
 211 {
 212     struct kvm_mp_state mp_state = { .mp_state = env->mp_state };
 213
 214     return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state);
 215 }
 216
 217 int kvm_get_mp_state(CPUState *env)
 218 {
 219     struct kvm_mp_state mp_state;
 220     int ret;
 221
 222     ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state);
 223     if (ret < 0) {
 224         return ret;
 225     }
 226     env->mp_state = mp_state.mp_state;
 227     return 0;
 228 }
 229
 230 /*
 231  * dirty pages logging control
 232  */
 233 static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr,
 234                                       ram_addr_t size, int flags, int mask)
 235 {
 236     KVMState *s = kvm_state;
 237     KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
 238     int old_flags;
 239
 240     if (mem == NULL)  {
 241             fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
 242                     TARGET_FMT_plx "\n", __func__, phys_addr,
 243                     (target_phys_addr_t)(phys_addr + size - 1));
 244             return -EINVAL;
 245     }
 246
 247     old_flags = mem->flags;
 248
 249     flags = (mem->flags & ~mask) | flags;
 250     mem->flags = flags;
 251
 252     /* If nothing changed effectively, no need to issue ioctl */
 253     if (s->migration_log) {
 254         flags |= KVM_MEM_LOG_DIRTY_PAGES;
 255     }
 256     if (flags == old_flags) {
 257             return 0;
 258     }
 259
 260     return kvm_set_user_memory_region(s, mem);
 261 }
 262
 263 int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
 264 {
 265         return kvm_dirty_pages_log_change(phys_addr, size,
 266                                           KVM_MEM_LOG_DIRTY_PAGES,
 267                                           KVM_MEM_LOG_DIRTY_PAGES);
 268 }
 269
 270 int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
 271 {
 272         return kvm_dirty_pages_log_change(phys_addr, size,
 273                                           0,
 274                                           KVM_MEM_LOG_DIRTY_PAGES);
 275 }
 276
 277 int kvm_set_migration_log(int enable)
 278 {
 279     KVMState *s = kvm_state;
 280     KVMSlot *mem;
 281     int i, err;
 282
 283     s->migration_log = enable;
 284
 285     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 286         mem = &s->slots[i];
 287
 288         if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
 289             continue;
 290         }
 291         err = kvm_set_user_memory_region(s, mem);
 292         if (err) {
 293             return err;
 294         }
 295     }
 296     return 0;
 297 }
 298
 299 static int test_le_bit(unsigned long nr, unsigned char *addr)
 300 {
 301     return (addr[nr >> 3] >> (nr & 7)) & 1;
 302 }
 303
 304 /**
 305  * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
 306  * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().
 307  * This means all bits are set to dirty.
 308  *
 309  * @start_add: start of logged region.
 310  * @end_addr: end of logged region.
 311  */
 312 int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
 313                                    target_phys_addr_t end_addr)
 314 {
 315     KVMState *s = kvm_state;
 316     unsigned long size, allocated_size = 0;
 317     target_phys_addr_t phys_addr;
 318     ram_addr_t addr;
 319     KVMDirtyLog d;
 320     KVMSlot *mem;
 321     int ret = 0;
 322
 323     d.dirty_bitmap = NULL;
 324     while (start_addr < end_addr) {
 325         mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);
 326         if (mem == NULL) {
 327             break;
 328         }
 329
 330         size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8;
 331         if (!d.dirty_bitmap) {
 332             d.dirty_bitmap = qemu_malloc(size);
 333         } else if (size > allocated_size) {
 334             d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size);
 335         }
 336         allocated_size = size;
 337         memset(d.dirty_bitmap, 0, allocated_size);
 338
 339         d.slot = mem->slot;
 340
 341         if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
 342             dprintf("ioctl failed %d\n", errno);
 343             ret = -1;
 344             break;
 345         }
 346
 347         for (phys_addr = mem->start_addr, addr = mem->phys_offset;
 348              phys_addr < mem->start_addr + mem->memory_size;
 349              phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
 350             unsigned char *bitmap = (unsigned char *)d.dirty_bitmap;
 351             unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS;
 352
 353             if (test_le_bit(nr, bitmap)) {
 354                 cpu_physical_memory_set_dirty(addr);
 355             }
 356         }
 357         start_addr = phys_addr;
 358     }
 359     qemu_free(d.dirty_bitmap);
 360
 361     return ret;
 362 }
 363 #endif
 364
 365 int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
 366 {
 367     int ret = -ENOSYS;
 368 #ifdef KVM_CAP_COALESCED_MMIO
 369     KVMState *s = kvm_state;
 370
 371     if (s->coalesced_mmio) {
 372         struct kvm_coalesced_mmio_zone zone;
 373
 374         zone.addr = start;
 375         zone.size = size;
 376
 377         ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
 378     }
 379 #endif
 380
 381     return ret;
 382 }
 383
 384 int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
 385 {
 386     int ret = -ENOSYS;
 387 #ifdef KVM_CAP_COALESCED_MMIO
 388     KVMState *s = kvm_state;
 389
 390     if (s->coalesced_mmio) {
 391         struct kvm_coalesced_mmio_zone zone;
 392
 393         zone.addr = start;
 394         zone.size = size;
 395
 396         ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
 397     }
 398 #endif
 399
 400     return ret;
 401 }
 402
 403 int kvm_check_extension(KVMState *s, unsigned int extension)
 404 {
 405     int ret;
 406
 407     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
 408     if (ret < 0) {
 409         ret = 0;
 410     }
 411
 412     return ret;
 413 }
 414 #ifdef KVM_UPSTREAM
 415
 416 int kvm_init(int smp_cpus)
 417 {
 418     static const char upgrade_note[] =
 419         "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
 420         "(see http://sourceforge.net/projects/kvm).\n";
 421     KVMState *s;
 422     int ret;
 423     int i;
 424
 425     if (smp_cpus > 1) {
 426         fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
 427         return -EINVAL;
 428     }
 429
 430     s = qemu_mallocz(sizeof(KVMState));
 431
 432 #ifdef KVM_CAP_SET_GUEST_DEBUG
 433     QTAILQ_INIT(&s->kvm_sw_breakpoints);
 434 #endif
 435     for (i = 0; i < ARRAY_SIZE(s->slots); i++)
 436         s->slots[i].slot = i;
 437
 438     s->vmfd = -1;
 439     s->fd = open("/dev/kvm", O_RDWR);
 440     if (s->fd == -1) {
 441         fprintf(stderr, "Could not access KVM kernel module: %m\n");
 442         ret = -errno;
 443         goto err;
 444     }
 445
 446     ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
 447     if (ret < KVM_API_VERSION) {
 448         if (ret > 0)
 449             ret = -EINVAL;
 450         fprintf(stderr, "kvm version too old\n");
 451         goto err;
 452     }
 453
 454     if (ret > KVM_API_VERSION) {
 455         ret = -EINVAL;
 456         fprintf(stderr, "kvm version not supported\n");
 457         goto err;
 458     }
 459
 460     s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
 461     if (s->vmfd < 0)
 462         goto err;
 463
 464     /* initially, KVM allocated its own memory and we had to jump through
 465      * hooks to make phys_ram_base point to this.  Modern versions of KVM
 466      * just use a user allocated buffer so we can use regular pages
 467      * unmodified.  Make sure we have a sufficiently modern version of KVM.
 468      */
 469     if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
 470         ret = -EINVAL;
 471         fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
 472                 upgrade_note);
 473         goto err;
 474     }
 475
 476     /* There was a nasty bug in < kvm-80 that prevents memory slots from being
 477      * destroyed properly.  Since we rely on this capability, refuse to work
 478      * with any kernel without this capability. */
 479     if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
 480         ret = -EINVAL;
 481
 482         fprintf(stderr,
 483                 "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
 484                 upgrade_note);
 485         goto err;
 486     }
 487
 488 #ifdef KVM_CAP_COALESCED_MMIO
 489     s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
 490 #else
 491     s->coalesced_mmio = 0;
 492 #endif
 493
 494     s->broken_set_mem_region = 1;
 495 #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
 496     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
 497     if (ret > 0) {
 498         s->broken_set_mem_region = 0;
 499     }
 500 #endif
 501
 502     ret = kvm_arch_init(s, smp_cpus);
 503     if (ret < 0)
 504         goto err;
 505
 506     kvm_state = s;
 507
 508     return 0;
 509
 510 err:
 511     if (s) {
 512         if (s->vmfd != -1)
 513             close(s->vmfd);
 514         if (s->fd != -1)
 515             close(s->fd);
 516     }
 517     qemu_free(s);
 518
 519     return ret;
 520 }
 521
 522 static int kvm_handle_io(uint16_t port, void *data, int direction, int size,
 523                          uint32_t count)
 524 {
 525     int i;
 526     uint8_t *ptr = data;
 527
 528     for (i = 0; i < count; i++) {
 529         if (direction == KVM_EXIT_IO_IN) {
 530             switch (size) {
 531             case 1:
 532                 stb_p(ptr, cpu_inb(port));
 533                 break;
 534             case 2:
 535                 stw_p(ptr, cpu_inw(port));
 536                 break;
 537             case 4:
 538                 stl_p(ptr, cpu_inl(port));
 539                 break;
 540             }
 541         } else {
 542             switch (size) {
 543             case 1:
 544                 cpu_outb(port, ldub_p(ptr));
 545                 break;
 546             case 2:
 547                 cpu_outw(port, lduw_p(ptr));
 548                 break;
 549             case 4:
 550                 cpu_outl(port, ldl_p(ptr));
 551                 break;
 552             }
 553         }
 554
 555         ptr += size;
 556     }
 557
 558     return 1;
 559 }
 560
 561 static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run)
 562 {
 563 #ifdef KVM_CAP_COALESCED_MMIO
 564     KVMState *s = kvm_state;
 565     if (s->coalesced_mmio) {
 566         struct kvm_coalesced_mmio_ring *ring;
 567
 568         ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE);
 569         while (ring->first != ring->last) {
 570             struct kvm_coalesced_mmio *ent;
 571
 572             ent = &ring->coalesced_mmio[ring->first];
 573
 574             cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
 575             /* FIXME smp_wmb() */
 576             ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
 577         }
 578     }
 579 #endif
 580 }
 581
 582 void kvm_cpu_synchronize_state(CPUState *env)
 583 {
 584     if (!env->kvm_state->regs_modified) {
 585         kvm_arch_get_registers(env);
 586         env->kvm_state->regs_modified = 1;
 587     }
 588 }
 589
 590 int kvm_cpu_exec(CPUState *env)
 591 {
 592     struct kvm_run *run = env->kvm_run;
 593     int ret;
 594
 595     dprintf("kvm_cpu_exec()\n");
 596
 597     do {
 598         if (env->exit_request) {
 599             dprintf("interrupt exit requested\n");
 600             ret = 0;
 601             break;
 602         }
 603
 604         if (env->kvm_state->regs_modified) {
 605             kvm_arch_put_registers(env);
 606             env->kvm_state->regs_modified = 0;
 607         }
 608
 609         kvm_arch_pre_run(env, run);
 610         ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
 611         kvm_arch_post_run(env, run);
 612
 613         if (ret == -EINTR || ret == -EAGAIN) {
 614             dprintf("io window exit\n");
 615             ret = 0;
 616             break;
 617         }
 618
 619         if (ret < 0) {
 620             dprintf("kvm run failed %s\n", strerror(-ret));
 621             abort();
 622         }
 623
 624         kvm_run_coalesced_mmio(env, run);
 625
 626         ret = 0; /* exit loop */
 627         switch (run->exit_reason) {
 628         case KVM_EXIT_IO:
 629             dprintf("handle_io\n");
 630             ret = kvm_handle_io(run->io.port,
 631                                 (uint8_t *)run + run->io.data_offset,
 632                                 run->io.direction,
 633                                 run->io.size,
 634                                 run->io.count);
 635             break;
 636         case KVM_EXIT_MMIO:
 637             dprintf("handle_mmio\n");
 638             cpu_physical_memory_rw(run->mmio.phys_addr,
 639                                    run->mmio.data,
 640                                    run->mmio.len,
 641                                    run->mmio.is_write);
 642             ret = 1;
 643             break;
 644         case KVM_EXIT_IRQ_WINDOW_OPEN:
 645             dprintf("irq_window_open\n");
 646             break;
 647         case KVM_EXIT_SHUTDOWN:
 648             dprintf("shutdown\n");
 649             qemu_system_reset_request();
 650             ret = 1;
 651             break;
 652         case KVM_EXIT_UNKNOWN:
 653             dprintf("kvm_exit_unknown\n");
 654             break;
 655         case KVM_EXIT_FAIL_ENTRY:
 656             dprintf("kvm_exit_fail_entry\n");
 657             break;
 658         case KVM_EXIT_EXCEPTION:
 659             dprintf("kvm_exit_exception\n");
 660             break;
 661         case KVM_EXIT_DEBUG:
 662             dprintf("kvm_exit_debug\n");
 663 #ifdef KVM_CAP_SET_GUEST_DEBUG
 664             if (kvm_arch_debug(&run->debug.arch)) {
 665                 gdb_set_stop_cpu(env);
 666                 vm_stop(EXCP_DEBUG);
 667                 env->exception_index = EXCP_DEBUG;
 668                 return 0;
 669             }
 670             /* re-enter, this exception was guest-internal */
 671             ret = 1;
 672 #endif /* KVM_CAP_SET_GUEST_DEBUG */
 673             break;
 674         default:
 675             dprintf("kvm_arch_handle_exit\n");
 676             ret = kvm_arch_handle_exit(env, run);
 677             break;
 678         }
 679     } while (ret > 0);
 680
 681     if (env->exit_request) {
 682         env->exit_request = 0;
 683         env->exception_index = EXCP_INTERRUPT;
 684     }
 685
 686     return ret;
 687 }
 688
 689 void kvm_set_phys_mem(target_phys_addr_t start_addr,
 690                       ram_addr_t size,
 691                       ram_addr_t phys_offset)
 692 {
 693     KVMState *s = kvm_state;
 694     ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
 695     KVMSlot *mem, old;
 696     int err;
 697
 698     if (start_addr & ~TARGET_PAGE_MASK) {
 699         if (flags >= IO_MEM_UNASSIGNED) {
 700             if (!kvm_lookup_overlapping_slot(s, start_addr,
 701                                              start_addr + size)) {
 702                 return;
 703             }
 704             fprintf(stderr, "Unaligned split of a KVM memory slot\n");
 705         } else {
 706             fprintf(stderr, "Only page-aligned memory slots supported\n");
 707         }
 708         abort();
 709     }
 710
 711     /* KVM does not support read-only slots */
 712     phys_offset &= ~IO_MEM_ROM;
 713
 714     while (1) {
 715         mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);
 716         if (!mem) {
 717             break;
 718         }
 719
 720         if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
 721             (start_addr + size <= mem->start_addr + mem->memory_size) &&
 722             (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) {
 723             /* The new slot fits into the existing one and comes with
 724              * identical parameters - nothing to be done. */
 725             return;
 726         }
 727
 728         old = *mem;
 729
 730         /* unregister the overlapping slot */
 731         mem->memory_size = 0;
 732         err = kvm_set_user_memory_region(s, mem);
 733         if (err) {
 734             fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
 735                     __func__, strerror(-err));
 736             abort();
 737         }
 738
 739         /* Workaround for older KVM versions: we can't join slots, even not by
 740          * unregistering the previous ones and then registering the larger
 741          * slot. We have to maintain the existing fragmentation. Sigh.
 742          *
 743          * This workaround assumes that the new slot starts at the same
 744          * address as the first existing one. If not or if some overlapping
 745          * slot comes around later, we will fail (not seen in practice so far)
 746          * - and actually require a recent KVM version. */
 747         if (s->broken_set_mem_region &&
 748             old.start_addr == start_addr && old.memory_size < size &&
 749             flags < IO_MEM_UNASSIGNED) {
 750             mem = kvm_alloc_slot(s);
 751             mem->memory_size = old.memory_size;
 752             mem->start_addr = old.start_addr;
 753             mem->phys_offset = old.phys_offset;
 754             mem->flags = 0;
 755
 756             err = kvm_set_user_memory_region(s, mem);
 757             if (err) {
 758                 fprintf(stderr, "%s: error updating slot: %s\n", __func__,
 759                         strerror(-err));
 760                 abort();
 761             }
 762
 763             start_addr += old.memory_size;
 764             phys_offset += old.memory_size;
 765             size -= old.memory_size;
 766             continue;
 767         }
 768
 769         /* register prefix slot */
 770         if (old.start_addr < start_addr) {
 771             mem = kvm_alloc_slot(s);
 772             mem->memory_size = start_addr - old.start_addr;
 773             mem->start_addr = old.start_addr;
 774             mem->phys_offset = old.phys_offset;
 775             mem->flags = 0;
 776
 777             err = kvm_set_user_memory_region(s, mem);
 778             if (err) {
 779                 fprintf(stderr, "%s: error registering prefix slot: %s\n",
 780                         __func__, strerror(-err));
 781                 abort();
 782             }
 783         }
 784
 785         /* register suffix slot */
 786         if (old.start_addr + old.memory_size > start_addr + size) {
 787             ram_addr_t size_delta;
 788
 789             mem = kvm_alloc_slot(s);
 790             mem->start_addr = start_addr + size;
 791             size_delta = mem->start_addr - old.start_addr;
 792             mem->memory_size = old.memory_size - size_delta;
 793             mem->phys_offset = old.phys_offset + size_delta;
 794             mem->flags = 0;
 795
 796             err = kvm_set_user_memory_region(s, mem);
 797             if (err) {
 798                 fprintf(stderr, "%s: error registering suffix slot: %s\n",
 799                         __func__, strerror(-err));
 800                 abort();
 801             }
 802         }
 803     }
 804
 805     /* in case the KVM bug workaround already "consumed" the new slot */
 806     if (!size)
 807         return;
 808
 809     /* KVM does not need to know about this memory */
 810     if (flags >= IO_MEM_UNASSIGNED)
 811         return;
 812
 813     mem = kvm_alloc_slot(s);
 814     mem->memory_size = size;
 815     mem->start_addr = start_addr;
 816     mem->phys_offset = phys_offset;
 817     mem->flags = 0;
 818
 819     err = kvm_set_user_memory_region(s, mem);
 820     if (err) {
 821         fprintf(stderr, "%s: error registering slot: %s\n", __func__,
 822                 strerror(-err));
 823         abort();
 824     }
 825 }
 826
 827 #endif
 828 int kvm_ioctl(KVMState *s, int type, ...)
 829 {
 830     int ret;
 831     void *arg;
 832     va_list ap;
 833
 834     va_start(ap, type);
 835     arg = va_arg(ap, void *);
 836     va_end(ap);
 837
 838     ret = ioctl(s->fd, type, arg);
 839     if (ret == -1)
 840         ret = -errno;
 841
 842     return ret;
 843 }
 844
 845 int kvm_vm_ioctl(KVMState *s, int type, ...)
 846 {
 847     int ret;
 848     void *arg;
 849     va_list ap;
 850
 851     va_start(ap, type);
 852     arg = va_arg(ap, void *);
 853     va_end(ap);
 854
 855     ret = ioctl(s->vmfd, type, arg);
 856     if (ret == -1)
 857         ret = -errno;
 858
 859     return ret;
 860 }
 861
 862 #ifdef KVM_UPSTREAM
 863 int kvm_vcpu_ioctl(CPUState *env, int type, ...)
 864 {
 865     int ret;
 866     void *arg;
 867     va_list ap;
 868
 869     va_start(ap, type);
 870     arg = va_arg(ap, void *);
 871     va_end(ap);
 872
 873     ret = ioctl(env->kvm_fd, type, arg);
 874     if (ret == -1)
 875         ret = -errno;
 876
 877     return ret;
 878 }
 879
 880 #endif
 881
 882 int kvm_has_sync_mmu(void)
 883 {
 884 #ifdef KVM_CAP_SYNC_MMU
 885     KVMState *s = kvm_state;
 886
 887     return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
 888 #else
 889     return 0;
 890 #endif
 891 }
 892
 893 #ifdef KVM_UPSTREAM
 894 void kvm_setup_guest_memory(void *start, size_t size)
 895 {
 896     if (!kvm_has_sync_mmu()) {
 897 #ifdef MADV_DONTFORK
 898         int ret = madvise(start, size, MADV_DONTFORK);
 899
 900         if (ret) {
 901             perror("madvice");
 902             exit(1);
 903         }
 904 #else
 905         fprintf(stderr,
 906                 "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
 907         exit(1);
 908 #endif
 909     }
 910 }
 911
 912 #endif /* KVM_UPSTREAM */
 913
 914 #ifdef KVM_CAP_SET_GUEST_DEBUG
 915
 916 #ifdef KVM_UPSTREAM
 917 static void on_vcpu(CPUState *env, void (*func)(void *data), void *data)
 918 {
 919 #ifdef CONFIG_IOTHREAD
 920     if (env == cpu_single_env) {
 921         func(data);
 922         return;
 923     }
 924     abort();
 925 #else
 926     func(data);
 927 #endif
 928 }
 929 #endif /* KVM_UPSTREAM */
 930
 931 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
 932                                                  target_ulong pc)
 933 {
 934     struct kvm_sw_breakpoint *bp;
 935
 936     QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) {
 937         if (bp->pc == pc)
 938             return bp;
 939     }
 940     return NULL;
 941 }
 942
 943 int kvm_sw_breakpoints_active(CPUState *env)
 944 {
 945     return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
 946 }
 947
 948 #ifdef KVM_UPSTREAM
 949
 950 struct kvm_set_guest_debug_data {
 951     struct kvm_guest_debug dbg;
 952     CPUState *env;
 953     int err;
 954 };
 955
 956 static void kvm_invoke_set_guest_debug(void *data)
 957 {
 958     struct kvm_set_guest_debug_data *dbg_data = data;
 959     CPUState *env = dbg_data->env;
 960
 961     if (env->kvm_state->regs_modified) {
 962         kvm_arch_put_registers(env);
 963         env->kvm_state->regs_modified = 0;
 964     }
 965     dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg);
 966 }
 967
 968 int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
 969 {
 970     struct kvm_set_guest_debug_data data;
 971
 972     data.dbg.control = 0;
 973     if (env->singlestep_enabled)
 974         data.dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
 975
 976     kvm_arch_update_guest_debug(env, &data.dbg);
 977     data.dbg.control |= reinject_trap;
 978     data.env = env;
 979
 980     on_vcpu(env, kvm_invoke_set_guest_debug, &data);
 981     return data.err;
 982 }
 983 #endif
 984
 985 int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
 986                           target_ulong len, int type)
 987 {
 988     struct kvm_sw_breakpoint *bp;
 989     CPUState *env;
 990     int err;
 991
 992     if (type == GDB_BREAKPOINT_SW) {
 993         bp = kvm_find_sw_breakpoint(current_env, addr);
 994         if (bp) {
 995             bp->use_count++;
 996             return 0;
 997         }
 998
 999         bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint));
1000         if (!bp)
1001             return -ENOMEM;
1002
1003         bp->pc = addr;
1004         bp->use_count = 1;
1005         err = kvm_arch_insert_sw_breakpoint(current_env, bp);
1006         if (err) {
1007             free(bp);
1008             return err;
1009         }
1010
1011         QTAILQ_INSERT_HEAD(&current_env->kvm_state->kvm_sw_breakpoints,
1012                           bp, entry);
1013     } else {
1014         err = kvm_arch_insert_hw_breakpoint(addr, len, type);
1015         if (err)
1016             return err;
1017     }
1018
1019     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1020         err = kvm_update_guest_debug(env, 0);
1021         if (err)
1022             return err;
1023     }
1024     return 0;
1025 }
1026
1027 int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
1028                           target_ulong len, int type)
1029 {
1030     struct kvm_sw_breakpoint *bp;
1031     CPUState *env;
1032     int err;
1033
1034     if (type == GDB_BREAKPOINT_SW) {
1035         bp = kvm_find_sw_breakpoint(current_env, addr);
1036         if (!bp)
1037             return -ENOENT;
1038
1039         if (bp->use_count > 1) {
1040             bp->use_count--;
1041             return 0;
1042         }
1043
1044         err = kvm_arch_remove_sw_breakpoint(current_env, bp);
1045         if (err)
1046             return err;
1047
1048         QTAILQ_REMOVE(&current_env->kvm_state->kvm_sw_breakpoints, bp, entry);
1049         qemu_free(bp);
1050     } else {
1051         err = kvm_arch_remove_hw_breakpoint(addr, len, type);
1052         if (err)
1053             return err;
1054     }
1055
1056     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1057         err = kvm_update_guest_debug(env, 0);
1058         if (err)
1059             return err;
1060     }
1061     return 0;
1062 }
1063
1064 void kvm_remove_all_breakpoints(CPUState *current_env)
1065 {
1066     struct kvm_sw_breakpoint *bp, *next;
1067     KVMState *s = current_env->kvm_state;
1068     CPUState *env;
1069
1070     QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
1071         if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) {
1072             /* Try harder to find a CPU that currently sees the breakpoint. */
1073             for (env = first_cpu; env != NULL; env = env->next_cpu) {
1074                 if (kvm_arch_remove_sw_breakpoint(env, bp) == 0)
1075                     break;
1076             }
1077         }
1078     }
1079     kvm_arch_remove_all_hw_breakpoints();
1080
1081     for (env = first_cpu; env != NULL; env = env->next_cpu)
1082         kvm_update_guest_debug(env, 0);
1083 }
1084
1085 #else /* !KVM_CAP_SET_GUEST_DEBUG */
1086
1087 int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
1088 {
1089     return -EINVAL;
1090 }
1091
1092 int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
1093                           target_ulong len, int type)
1094 {
1095     return -EINVAL;
1096 }
1097
1098 int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
1099                           target_ulong len, int type)
1100 {
1101     return -EINVAL;
1102 }
1103
1104 void kvm_remove_all_breakpoints(CPUState *current_env)
1105 {
1106 }
1107 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
1108
1109 #include "qemu-kvm.c"