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 "qemu-barrier.h"
  25 #include "sysemu.h"
  26 #include "hw/hw.h"
  27 #include "gdbstub.h"
  28 #include "kvm.h"
  29
  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 struct KVMState
  55 {
  56     KVMSlot slots[32];
  57     int fd;
  58     int vmfd;
  59     int coalesced_mmio;
  60 #ifdef KVM_CAP_COALESCED_MMIO
  61     struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
  62 #endif
  63     int broken_set_mem_region;
  64     int migration_log;
  65     int vcpu_events;
  66     int robust_singlestep;
  67 #ifdef KVM_CAP_SET_GUEST_DEBUG
  68     struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
  69 #endif
  70     int irqchip_in_kernel;
  71     int pit_in_kernel;
  72 };
  73
  74 static KVMState *kvm_state;
  75
  76 static KVMSlot *kvm_alloc_slot(KVMState *s)
  77 {
  78     int i;
  79
  80     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
  81         /* KVM private memory slots */
  82         if (i >= 8 && i < 12)
  83             continue;
  84         if (s->slots[i].memory_size == 0)
  85             return &s->slots[i];
  86     }
  87
  88     fprintf(stderr, "%s: no free slot available\n", __func__);
  89     abort();
  90 }
  91
  92 static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
  93                                          target_phys_addr_t start_addr,
  94                                          target_phys_addr_t end_addr)
  95 {
  96     int i;
  97
  98     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
  99         KVMSlot *mem = &s->slots[i];
 100
 101         if (start_addr == mem->start_addr &&
 102             end_addr == mem->start_addr + mem->memory_size) {
 103             return mem;
 104         }
 105     }
 106
 107     return NULL;
 108 }
 109
 110 /*
 111  * Find overlapping slot with lowest start address
 112  */
 113 static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s,
 114                                             target_phys_addr_t start_addr,
 115                                             target_phys_addr_t end_addr)
 116 {
 117     KVMSlot *found = NULL;
 118     int i;
 119
 120     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 121         KVMSlot *mem = &s->slots[i];
 122
 123         if (mem->memory_size == 0 ||
 124             (found && found->start_addr < mem->start_addr)) {
 125             continue;
 126         }
 127
 128         if (end_addr > mem->start_addr &&
 129             start_addr < mem->start_addr + mem->memory_size) {
 130             found = mem;
 131         }
 132     }
 133
 134     return found;
 135 }
 136
 137 static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
 138 {
 139     struct kvm_userspace_memory_region mem;
 140
 141     mem.slot = slot->slot;
 142     mem.guest_phys_addr = slot->start_addr;
 143     mem.memory_size = slot->memory_size;
 144     mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset);
 145     mem.flags = slot->flags;
 146     if (s->migration_log) {
 147         mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;
 148     }
 149     return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
 150 }
 151
 152 static void kvm_reset_vcpu(void *opaque)
 153 {
 154     CPUState *env = opaque;
 155
 156     kvm_arch_reset_vcpu(env);
 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 #ifdef KVM_CAP_COALESCED_MMIO
 202     if (s->coalesced_mmio && !s->coalesced_mmio_ring)
 203         s->coalesced_mmio_ring = (void *) env->kvm_run +
 204                 s->coalesced_mmio * PAGE_SIZE;
 205 #endif
 206
 207     ret = kvm_arch_init_vcpu(env);
 208     if (ret == 0) {
 209         qemu_register_reset(kvm_reset_vcpu, env);
 210         kvm_arch_reset_vcpu(env);
 211     }
 212 err:
 213     return ret;
 214 }
 215
 216 /*
 217  * dirty pages logging control
 218  */
 219 static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr,
 220                                       ram_addr_t size, int flags, int mask)
 221 {
 222     KVMState *s = kvm_state;
 223     KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
 224     int old_flags;
 225
 226     if (mem == NULL)  {
 227             fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
 228                     TARGET_FMT_plx "\n", __func__, phys_addr,
 229                     (target_phys_addr_t)(phys_addr + size - 1));
 230             return -EINVAL;
 231     }
 232
 233     old_flags = mem->flags;
 234
 235     flags = (mem->flags & ~mask) | flags;
 236     mem->flags = flags;
 237
 238     /* If nothing changed effectively, no need to issue ioctl */
 239     if (s->migration_log) {
 240         flags |= KVM_MEM_LOG_DIRTY_PAGES;
 241     }
 242     if (flags == old_flags) {
 243             return 0;
 244     }
 245
 246     return kvm_set_user_memory_region(s, mem);
 247 }
 248
 249 int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
 250 {
 251         return kvm_dirty_pages_log_change(phys_addr, size,
 252                                           KVM_MEM_LOG_DIRTY_PAGES,
 253                                           KVM_MEM_LOG_DIRTY_PAGES);
 254 }
 255
 256 int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
 257 {
 258         return kvm_dirty_pages_log_change(phys_addr, size,
 259                                           0,
 260                                           KVM_MEM_LOG_DIRTY_PAGES);
 261 }
 262
 263 static int kvm_set_migration_log(int enable)
 264 {
 265     KVMState *s = kvm_state;
 266     KVMSlot *mem;
 267     int i, err;
 268
 269     s->migration_log = enable;
 270
 271     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 272         mem = &s->slots[i];
 273
 274         if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
 275             continue;
 276         }
 277         err = kvm_set_user_memory_region(s, mem);
 278         if (err) {
 279             return err;
 280         }
 281     }
 282     return 0;
 283 }
 284
 285 static int test_le_bit(unsigned long nr, unsigned char *addr)
 286 {
 287     return (addr[nr >> 3] >> (nr & 7)) & 1;
 288 }
 289
 290 /**
 291  * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
 292  * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().
 293  * This means all bits are set to dirty.
 294  *
 295  * @start_add: start of logged region.
 296  * @end_addr: end of logged region.
 297  */
 298 static int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
 299                                           target_phys_addr_t end_addr)
 300 {
 301     KVMState *s = kvm_state;
 302     unsigned long size, allocated_size = 0;
 303     target_phys_addr_t phys_addr;
 304     ram_addr_t addr;
 305     KVMDirtyLog d;
 306     KVMSlot *mem;
 307     int ret = 0;
 308
 309     d.dirty_bitmap = NULL;
 310     while (start_addr < end_addr) {
 311         mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);
 312         if (mem == NULL) {
 313             break;
 314         }
 315
 316         size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8;
 317         if (!d.dirty_bitmap) {
 318             d.dirty_bitmap = qemu_malloc(size);
 319         } else if (size > allocated_size) {
 320             d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size);
 321         }
 322         allocated_size = size;
 323         memset(d.dirty_bitmap, 0, allocated_size);
 324
 325         d.slot = mem->slot;
 326
 327         if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
 328             dprintf("ioctl failed %d\n", errno);
 329             ret = -1;
 330             break;
 331         }
 332
 333         for (phys_addr = mem->start_addr, addr = mem->phys_offset;
 334              phys_addr < mem->start_addr + mem->memory_size;
 335              phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
 336             unsigned char *bitmap = (unsigned char *)d.dirty_bitmap;
 337             unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS;
 338
 339             if (test_le_bit(nr, bitmap)) {
 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_set_phys_mem(target_phys_addr_t start_addr,
 401                              ram_addr_t size,
 402                              ram_addr_t phys_offset)
 403 {
 404     KVMState *s = kvm_state;
 405     ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
 406     KVMSlot *mem, old;
 407     int err;
 408
 409     if (start_addr & ~TARGET_PAGE_MASK) {
 410         if (flags >= IO_MEM_UNASSIGNED) {
 411             if (!kvm_lookup_overlapping_slot(s, start_addr,
 412                                              start_addr + size)) {
 413                 return;
 414             }
 415             fprintf(stderr, "Unaligned split of a KVM memory slot\n");
 416         } else {
 417             fprintf(stderr, "Only page-aligned memory slots supported\n");
 418         }
 419         abort();
 420     }
 421
 422     /* KVM does not support read-only slots */
 423     phys_offset &= ~IO_MEM_ROM;
 424
 425     while (1) {
 426         mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);
 427         if (!mem) {
 428             break;
 429         }
 430
 431         if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
 432             (start_addr + size <= mem->start_addr + mem->memory_size) &&
 433             (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) {
 434             /* The new slot fits into the existing one and comes with
 435              * identical parameters - nothing to be done. */
 436             return;
 437         }
 438
 439         old = *mem;
 440
 441         /* unregister the overlapping slot */
 442         mem->memory_size = 0;
 443         err = kvm_set_user_memory_region(s, mem);
 444         if (err) {
 445             fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
 446                     __func__, strerror(-err));
 447             abort();
 448         }
 449
 450         /* Workaround for older KVM versions: we can't join slots, even not by
 451          * unregistering the previous ones and then registering the larger
 452          * slot. We have to maintain the existing fragmentation. Sigh.
 453          *
 454          * This workaround assumes that the new slot starts at the same
 455          * address as the first existing one. If not or if some overlapping
 456          * slot comes around later, we will fail (not seen in practice so far)
 457          * - and actually require a recent KVM version. */
 458         if (s->broken_set_mem_region &&
 459             old.start_addr == start_addr && old.memory_size < size &&
 460             flags < IO_MEM_UNASSIGNED) {
 461             mem = kvm_alloc_slot(s);
 462             mem->memory_size = old.memory_size;
 463             mem->start_addr = old.start_addr;
 464             mem->phys_offset = old.phys_offset;
 465             mem->flags = 0;
 466
 467             err = kvm_set_user_memory_region(s, mem);
 468             if (err) {
 469                 fprintf(stderr, "%s: error updating slot: %s\n", __func__,
 470                         strerror(-err));
 471                 abort();
 472             }
 473
 474             start_addr += old.memory_size;
 475             phys_offset += old.memory_size;
 476             size -= old.memory_size;
 477             continue;
 478         }
 479
 480         /* register prefix slot */
 481         if (old.start_addr < start_addr) {
 482             mem = kvm_alloc_slot(s);
 483             mem->memory_size = start_addr - old.start_addr;
 484             mem->start_addr = old.start_addr;
 485             mem->phys_offset = old.phys_offset;
 486             mem->flags = 0;
 487
 488             err = kvm_set_user_memory_region(s, mem);
 489             if (err) {
 490                 fprintf(stderr, "%s: error registering prefix slot: %s\n",
 491                         __func__, strerror(-err));
 492                 abort();
 493             }
 494         }
 495
 496         /* register suffix slot */
 497         if (old.start_addr + old.memory_size > start_addr + size) {
 498             ram_addr_t size_delta;
 499
 500             mem = kvm_alloc_slot(s);
 501             mem->start_addr = start_addr + size;
 502             size_delta = mem->start_addr - old.start_addr;
 503             mem->memory_size = old.memory_size - size_delta;
 504             mem->phys_offset = old.phys_offset + size_delta;
 505             mem->flags = 0;
 506
 507             err = kvm_set_user_memory_region(s, mem);
 508             if (err) {
 509                 fprintf(stderr, "%s: error registering suffix slot: %s\n",
 510                         __func__, strerror(-err));
 511                 abort();
 512             }
 513         }
 514     }
 515
 516     /* in case the KVM bug workaround already "consumed" the new slot */
 517     if (!size)
 518         return;
 519
 520     /* KVM does not need to know about this memory */
 521     if (flags >= IO_MEM_UNASSIGNED)
 522         return;
 523
 524     mem = kvm_alloc_slot(s);
 525     mem->memory_size = size;
 526     mem->start_addr = start_addr;
 527     mem->phys_offset = phys_offset;
 528     mem->flags = 0;
 529
 530     err = kvm_set_user_memory_region(s, mem);
 531     if (err) {
 532         fprintf(stderr, "%s: error registering slot: %s\n", __func__,
 533                 strerror(-err));
 534         abort();
 535     }
 536 }
 537
 538 static void kvm_client_set_memory(struct CPUPhysMemoryClient *client,
 539                                   target_phys_addr_t start_addr,
 540                                   ram_addr_t size,
 541                                   ram_addr_t phys_offset)
 542 {
 543         kvm_set_phys_mem(start_addr, size, phys_offset);
 544 }
 545
 546 static int kvm_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client,
 547                                         target_phys_addr_t start_addr,
 548                                         target_phys_addr_t end_addr)
 549 {
 550         return kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
 551 }
 552
 553 static int kvm_client_migration_log(struct CPUPhysMemoryClient *client,
 554                                     int enable)
 555 {
 556         return kvm_set_migration_log(enable);
 557 }
 558
 559 static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {
 560         .set_memory = kvm_client_set_memory,
 561         .sync_dirty_bitmap = kvm_client_sync_dirty_bitmap,
 562         .migration_log = kvm_client_migration_log,
 563 };
 564
 565 int kvm_init(int smp_cpus)
 566 {
 567     static const char upgrade_note[] =
 568         "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
 569         "(see http://sourceforge.net/projects/kvm).\n";
 570     KVMState *s;
 571     int ret;
 572     int i;
 573
 574     if (smp_cpus > 1) {
 575         fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
 576         return -EINVAL;
 577     }
 578
 579     s = qemu_mallocz(sizeof(KVMState));
 580
 581 #ifdef KVM_CAP_SET_GUEST_DEBUG
 582     QTAILQ_INIT(&s->kvm_sw_breakpoints);
 583 #endif
 584     for (i = 0; i < ARRAY_SIZE(s->slots); i++)
 585         s->slots[i].slot = i;
 586
 587     s->vmfd = -1;
 588     s->fd = qemu_open("/dev/kvm", O_RDWR);
 589     if (s->fd == -1) {
 590         fprintf(stderr, "Could not access KVM kernel module: %m\n");
 591         ret = -errno;
 592         goto err;
 593     }
 594
 595     ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
 596     if (ret < KVM_API_VERSION) {
 597         if (ret > 0)
 598             ret = -EINVAL;
 599         fprintf(stderr, "kvm version too old\n");
 600         goto err;
 601     }
 602
 603     if (ret > KVM_API_VERSION) {
 604         ret = -EINVAL;
 605         fprintf(stderr, "kvm version not supported\n");
 606         goto err;
 607     }
 608
 609     s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
 610     if (s->vmfd < 0)
 611         goto err;
 612
 613     /* initially, KVM allocated its own memory and we had to jump through
 614      * hooks to make phys_ram_base point to this.  Modern versions of KVM
 615      * just use a user allocated buffer so we can use regular pages
 616      * unmodified.  Make sure we have a sufficiently modern version of KVM.
 617      */
 618     if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
 619         ret = -EINVAL;
 620         fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
 621                 upgrade_note);
 622         goto err;
 623     }
 624
 625     /* There was a nasty bug in < kvm-80 that prevents memory slots from being
 626      * destroyed properly.  Since we rely on this capability, refuse to work
 627      * with any kernel without this capability. */
 628     if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
 629         ret = -EINVAL;
 630
 631         fprintf(stderr,
 632                 "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
 633                 upgrade_note);
 634         goto err;
 635     }
 636
 637     s->coalesced_mmio = 0;
 638 #ifdef KVM_CAP_COALESCED_MMIO
 639     s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
 640     s->coalesced_mmio_ring = NULL;
 641 #endif
 642
 643     s->broken_set_mem_region = 1;
 644 #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
 645     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
 646     if (ret > 0) {
 647         s->broken_set_mem_region = 0;
 648     }
 649 #endif
 650
 651     s->vcpu_events = 0;
 652 #ifdef KVM_CAP_VCPU_EVENTS
 653     s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
 654 #endif
 655
 656     s->robust_singlestep = 0;
 657 #ifdef KVM_CAP_X86_ROBUST_SINGLESTEP
 658     s->robust_singlestep =
 659         kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
 660 #endif
 661
 662     ret = kvm_arch_init(s, smp_cpus);
 663     if (ret < 0)
 664         goto err;
 665
 666     kvm_state = s;
 667     cpu_register_phys_memory_client(&kvm_cpu_phys_memory_client);
 668
 669     return 0;
 670
 671 err:
 672     if (s) {
 673         if (s->vmfd != -1)
 674             close(s->vmfd);
 675         if (s->fd != -1)
 676             close(s->fd);
 677     }
 678     qemu_free(s);
 679
 680     return ret;
 681 }
 682
 683 static int kvm_handle_io(uint16_t port, void *data, int direction, int size,
 684                          uint32_t count)
 685 {
 686     int i;
 687     uint8_t *ptr = data;
 688
 689     for (i = 0; i < count; i++) {
 690         if (direction == KVM_EXIT_IO_IN) {
 691             switch (size) {
 692             case 1:
 693                 stb_p(ptr, cpu_inb(port));
 694                 break;
 695             case 2:
 696                 stw_p(ptr, cpu_inw(port));
 697                 break;
 698             case 4:
 699                 stl_p(ptr, cpu_inl(port));
 700                 break;
 701             }
 702         } else {
 703             switch (size) {
 704             case 1:
 705                 cpu_outb(port, ldub_p(ptr));
 706                 break;
 707             case 2:
 708                 cpu_outw(port, lduw_p(ptr));
 709                 break;
 710             case 4:
 711                 cpu_outl(port, ldl_p(ptr));
 712                 break;
 713             }
 714         }
 715
 716         ptr += size;
 717     }
 718
 719     return 1;
 720 }
 721
 722 void kvm_flush_coalesced_mmio_buffer(void)
 723 {
 724 #ifdef KVM_CAP_COALESCED_MMIO
 725     KVMState *s = kvm_state;
 726     if (s->coalesced_mmio_ring) {
 727         struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
 728         while (ring->first != ring->last) {
 729             struct kvm_coalesced_mmio *ent;
 730
 731             ent = &ring->coalesced_mmio[ring->first];
 732
 733             cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
 734             smp_wmb();
 735             ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
 736         }
 737     }
 738 #endif
 739 }
 740
 741 void kvm_cpu_synchronize_state(CPUState *env)
 742 {
 743     if (!env->kvm_vcpu_dirty) {
 744         kvm_arch_get_registers(env);
 745         env->kvm_vcpu_dirty = 1;
 746     }
 747 }
 748
 749 void kvm_cpu_synchronize_post_reset(CPUState *env)
 750 {
 751     kvm_arch_put_registers(env, KVM_PUT_RESET_STATE);
 752     env->kvm_vcpu_dirty = 0;
 753 }
 754
 755 void kvm_cpu_synchronize_post_init(CPUState *env)
 756 {
 757     kvm_arch_put_registers(env, KVM_PUT_FULL_STATE);
 758     env->kvm_vcpu_dirty = 0;
 759 }
 760
 761 int kvm_cpu_exec(CPUState *env)
 762 {
 763     struct kvm_run *run = env->kvm_run;
 764     int ret;
 765
 766     dprintf("kvm_cpu_exec()\n");
 767
 768     do {
 769 #ifndef CONFIG_IOTHREAD
 770         if (env->exit_request) {
 771             dprintf("interrupt exit requested\n");
 772             ret = 0;
 773             break;
 774         }
 775 #endif
 776
 777         if (env->kvm_vcpu_dirty) {
 778             kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);
 779             env->kvm_vcpu_dirty = 0;
 780         }
 781
 782         kvm_arch_pre_run(env, run);
 783         qemu_mutex_unlock_iothread();
 784         ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
 785         qemu_mutex_lock_iothread();
 786         kvm_arch_post_run(env, run);
 787
 788         if (ret == -EINTR || ret == -EAGAIN) {
 789             cpu_exit(env);
 790             dprintf("io window exit\n");
 791             ret = 0;
 792             break;
 793         }
 794
 795         if (ret < 0) {
 796             dprintf("kvm run failed %s\n", strerror(-ret));
 797             abort();
 798         }
 799
 800         kvm_flush_coalesced_mmio_buffer();
 801
 802         ret = 0; /* exit loop */
 803         switch (run->exit_reason) {
 804         case KVM_EXIT_IO:
 805             dprintf("handle_io\n");
 806             ret = kvm_handle_io(run->io.port,
 807                                 (uint8_t *)run + run->io.data_offset,
 808                                 run->io.direction,
 809                                 run->io.size,
 810                                 run->io.count);
 811             break;
 812         case KVM_EXIT_MMIO:
 813             dprintf("handle_mmio\n");
 814             cpu_physical_memory_rw(run->mmio.phys_addr,
 815                                    run->mmio.data,
 816                                    run->mmio.len,
 817                                    run->mmio.is_write);
 818             ret = 1;
 819             break;
 820         case KVM_EXIT_IRQ_WINDOW_OPEN:
 821             dprintf("irq_window_open\n");
 822             break;
 823         case KVM_EXIT_SHUTDOWN:
 824             dprintf("shutdown\n");
 825             qemu_system_reset_request();
 826             ret = 1;
 827             break;
 828         case KVM_EXIT_UNKNOWN:
 829             dprintf("kvm_exit_unknown\n");
 830             break;
 831         case KVM_EXIT_FAIL_ENTRY:
 832             dprintf("kvm_exit_fail_entry\n");
 833             break;
 834         case KVM_EXIT_EXCEPTION:
 835             dprintf("kvm_exit_exception\n");
 836             break;
 837         case KVM_EXIT_DEBUG:
 838             dprintf("kvm_exit_debug\n");
 839 #ifdef KVM_CAP_SET_GUEST_DEBUG
 840             if (kvm_arch_debug(&run->debug.arch)) {
 841                 gdb_set_stop_cpu(env);
 842                 vm_stop(EXCP_DEBUG);
 843                 env->exception_index = EXCP_DEBUG;
 844                 return 0;
 845             }
 846             /* re-enter, this exception was guest-internal */
 847             ret = 1;
 848 #endif /* KVM_CAP_SET_GUEST_DEBUG */
 849             break;
 850         default:
 851             dprintf("kvm_arch_handle_exit\n");
 852             ret = kvm_arch_handle_exit(env, run);
 853             break;
 854         }
 855     } while (ret > 0);
 856
 857     if (env->exit_request) {
 858         env->exit_request = 0;
 859         env->exception_index = EXCP_INTERRUPT;
 860     }
 861
 862     return ret;
 863 }
 864
 865 int kvm_ioctl(KVMState *s, int type, ...)
 866 {
 867     int ret;
 868     void *arg;
 869     va_list ap;
 870
 871     va_start(ap, type);
 872     arg = va_arg(ap, void *);
 873     va_end(ap);
 874
 875     ret = ioctl(s->fd, type, arg);
 876     if (ret == -1)
 877         ret = -errno;
 878
 879     return ret;
 880 }
 881
 882 int kvm_vm_ioctl(KVMState *s, int type, ...)
 883 {
 884     int ret;
 885     void *arg;
 886     va_list ap;
 887
 888     va_start(ap, type);
 889     arg = va_arg(ap, void *);
 890     va_end(ap);
 891
 892     ret = ioctl(s->vmfd, type, arg);
 893     if (ret == -1)
 894         ret = -errno;
 895
 896     return ret;
 897 }
 898
 899 int kvm_vcpu_ioctl(CPUState *env, int type, ...)
 900 {
 901     int ret;
 902     void *arg;
 903     va_list ap;
 904
 905     va_start(ap, type);
 906     arg = va_arg(ap, void *);
 907     va_end(ap);
 908
 909     ret = ioctl(env->kvm_fd, type, arg);
 910     if (ret == -1)
 911         ret = -errno;
 912
 913     return ret;
 914 }
 915
 916 int kvm_has_sync_mmu(void)
 917 {
 918 #ifdef KVM_CAP_SYNC_MMU
 919     KVMState *s = kvm_state;
 920
 921     return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
 922 #else
 923     return 0;
 924 #endif
 925 }
 926
 927 int kvm_has_vcpu_events(void)
 928 {
 929     return kvm_state->vcpu_events;
 930 }
 931
 932 int kvm_has_robust_singlestep(void)
 933 {
 934     return kvm_state->robust_singlestep;
 935 }
 936
 937 void kvm_setup_guest_memory(void *start, size_t size)
 938 {
 939     if (!kvm_has_sync_mmu()) {
 940 #ifdef MADV_DONTFORK
 941         int ret = madvise(start, size, MADV_DONTFORK);
 942
 943         if (ret) {
 944             perror("madvice");
 945             exit(1);
 946         }
 947 #else
 948         fprintf(stderr,
 949                 "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
 950         exit(1);
 951 #endif
 952     }
 953 }
 954
 955 #ifdef KVM_CAP_SET_GUEST_DEBUG
 956 static void on_vcpu(CPUState *env, void (*func)(void *data), void *data)
 957 {
 958 #ifdef CONFIG_IOTHREAD
 959     if (env != cpu_single_env) {
 960         abort();
 961     }
 962 #endif
 963     func(data);
 964 }
 965
 966 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
 967                                                  target_ulong pc)
 968 {
 969     struct kvm_sw_breakpoint *bp;
 970
 971     QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) {
 972         if (bp->pc == pc)
 973             return bp;
 974     }
 975     return NULL;
 976 }
 977
 978 int kvm_sw_breakpoints_active(CPUState *env)
 979 {
 980     return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
 981 }
 982
 983 struct kvm_set_guest_debug_data {
 984     struct kvm_guest_debug dbg;
 985     CPUState *env;
 986     int err;
 987 };
 988
 989 static void kvm_invoke_set_guest_debug(void *data)
 990 {
 991     struct kvm_set_guest_debug_data *dbg_data = data;
 992     CPUState *env = dbg_data->env;
 993
 994     dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg);
 995 }
 996
 997 int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
 998 {
 999     struct kvm_set_guest_debug_data data;
1000
1001     data.dbg.control = reinject_trap;
1002
1003     if (env->singlestep_enabled) {
1004         data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
1005     }
1006     kvm_arch_update_guest_debug(env, &data.dbg);
1007     data.env = env;
1008
1009     on_vcpu(env, kvm_invoke_set_guest_debug, &data);
1010     return data.err;
1011 }
1012
1013 int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
1014                           target_ulong len, int type)
1015 {
1016     struct kvm_sw_breakpoint *bp;
1017     CPUState *env;
1018     int err;
1019
1020     if (type == GDB_BREAKPOINT_SW) {
1021         bp = kvm_find_sw_breakpoint(current_env, addr);
1022         if (bp) {
1023             bp->use_count++;
1024             return 0;
1025         }
1026
1027         bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint));
1028         if (!bp)
1029             return -ENOMEM;
1030
1031         bp->pc = addr;
1032         bp->use_count = 1;
1033         err = kvm_arch_insert_sw_breakpoint(current_env, bp);
1034         if (err) {
1035             free(bp);
1036             return err;
1037         }
1038
1039         QTAILQ_INSERT_HEAD(&current_env->kvm_state->kvm_sw_breakpoints,
1040                           bp, entry);
1041     } else {
1042         err = kvm_arch_insert_hw_breakpoint(addr, len, type);
1043         if (err)
1044             return err;
1045     }
1046
1047     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1048         err = kvm_update_guest_debug(env, 0);
1049         if (err)
1050             return err;
1051     }
1052     return 0;
1053 }
1054
1055 int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
1056                           target_ulong len, int type)
1057 {
1058     struct kvm_sw_breakpoint *bp;
1059     CPUState *env;
1060     int err;
1061
1062     if (type == GDB_BREAKPOINT_SW) {
1063         bp = kvm_find_sw_breakpoint(current_env, addr);
1064         if (!bp)
1065             return -ENOENT;
1066
1067         if (bp->use_count > 1) {
1068             bp->use_count--;
1069             return 0;
1070         }
1071
1072         err = kvm_arch_remove_sw_breakpoint(current_env, bp);
1073         if (err)
1074             return err;
1075
1076         QTAILQ_REMOVE(&current_env->kvm_state->kvm_sw_breakpoints, bp, entry);
1077         qemu_free(bp);
1078     } else {
1079         err = kvm_arch_remove_hw_breakpoint(addr, len, type);
1080         if (err)
1081             return err;
1082     }
1083
1084     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1085         err = kvm_update_guest_debug(env, 0);
1086         if (err)
1087             return err;
1088     }
1089     return 0;
1090 }
1091
1092 void kvm_remove_all_breakpoints(CPUState *current_env)
1093 {
1094     struct kvm_sw_breakpoint *bp, *next;
1095     KVMState *s = current_env->kvm_state;
1096     CPUState *env;
1097
1098     QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
1099         if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) {
1100             /* Try harder to find a CPU that currently sees the breakpoint. */
1101             for (env = first_cpu; env != NULL; env = env->next_cpu) {
1102                 if (kvm_arch_remove_sw_breakpoint(env, bp) == 0)
1103                     break;
1104             }
1105         }
1106     }
1107     kvm_arch_remove_all_hw_breakpoints();
1108
1109     for (env = first_cpu; env != NULL; env = env->next_cpu)
1110         kvm_update_guest_debug(env, 0);
1111 }
1112
1113 #else /* !KVM_CAP_SET_GUEST_DEBUG */
1114
1115 int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
1116 {
1117     return -EINVAL;
1118 }
1119
1120 int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
1121                           target_ulong len, int type)
1122 {
1123     return -EINVAL;
1124 }
1125
1126 int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
1127                           target_ulong len, int type)
1128 {
1129     return -EINVAL;
1130 }
1131
1132 void kvm_remove_all_breakpoints(CPUState *current_env)
1133 {
1134 }
1135 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
1136
1137 int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset)
1138 {
1139     struct kvm_signal_mask *sigmask;
1140     int r;
1141
1142     if (!sigset)
1143         return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL);
1144
1145     sigmask = qemu_malloc(sizeof(*sigmask) + sizeof(*sigset));
1146
1147     sigmask->len = 8;
1148     memcpy(sigmask->sigset, sigset, sizeof(*sigset));
1149     r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask);
1150     free(sigmask);
1151
1152     return r;
1153 }
1154
1155 #ifdef KVM_IOEVENTFD
1156 int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
1157 {
1158     struct kvm_ioeventfd kick = {
1159         .datamatch = val,
1160         .addr = addr,
1161         .len = 2,
1162         .flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO,
1163         .fd = fd,
1164     };
1165     int r;
1166     if (!kvm_enabled())
1167         return -ENOSYS;
1168     if (!assign)
1169         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
1170     r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
1171     if (r < 0)
1172         return r;
1173     return 0;
1174 }
1175 #endif