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 "qemu-option.h"
  26 #include "qemu-config.h"
  27 #include "sysemu.h"
  28 #include "hw/hw.h"
  29 #include "hw/msi.h"
  30 #include "gdbstub.h"
  31 #include "kvm.h"
  32 #include "bswap.h"
  33 #include "memory.h"
  34 #include "exec-memory.h"
  35 #include "event_notifier.h"
  36
  37 /* This check must be after config-host.h is included */
  38 #ifdef CONFIG_EVENTFD
  39 #include <sys/eventfd.h>
  40 #endif
  41
  42 #ifdef CONFIG_VALGRIND_H
  43 #include <valgrind/memcheck.h>
  44 #endif
  45
  46 /* KVM uses PAGE_SIZE in its definition of COALESCED_MMIO_MAX */
  47 #define PAGE_SIZE TARGET_PAGE_SIZE
  48
  49 //#define DEBUG_KVM
  50
  51 #ifdef DEBUG_KVM
  52 #define DPRINTF(fmt, ...) \
  53     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  54 #else
  55 #define DPRINTF(fmt, ...) \
  56     do { } while (0)
  57 #endif
  58
  59 #define KVM_MSI_HASHTAB_SIZE    256
  60
  61 typedef struct KVMSlot
  62 {
  63     hwaddr start_addr;
  64     ram_addr_t memory_size;
  65     void *ram;
  66     int slot;
  67     int flags;
  68 } KVMSlot;
  69
  70 typedef struct kvm_dirty_log KVMDirtyLog;
  71
  72 struct KVMState
  73 {
  74     KVMSlot slots[32];
  75     int fd;
  76     int vmfd;
  77     int coalesced_mmio;
  78     struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
  79     bool coalesced_flush_in_progress;
  80     int broken_set_mem_region;
  81     int migration_log;
  82     int vcpu_events;
  83     int robust_singlestep;
  84     int debugregs;
  85 #ifdef KVM_CAP_SET_GUEST_DEBUG
  86     struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
  87 #endif
  88     int pit_state2;
  89     int xsave, xcrs;
  90     int many_ioeventfds;
  91     int intx_set_mask;
  92     /* The man page (and posix) say ioctl numbers are signed int, but
  93      * they're not.  Linux, glibc and *BSD all treat ioctl numbers as
  94      * unsigned, and treating them as signed here can break things */
  95     unsigned irq_set_ioctl;
  96 #ifdef KVM_CAP_IRQ_ROUTING
  97     struct kvm_irq_routing *irq_routes;
  98     int nr_allocated_irq_routes;
  99     uint32_t *used_gsi_bitmap;
 100     unsigned int gsi_count;
 101     QTAILQ_HEAD(msi_hashtab, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE];
 102     bool direct_msi;
 103 #endif
 104 };
 105
 106 KVMState *kvm_state;
 107 bool kvm_kernel_irqchip;
 108 bool kvm_async_interrupts_allowed;
 109 bool kvm_irqfds_allowed;
 110 bool kvm_msi_via_irqfd_allowed;
 111 bool kvm_gsi_routing_allowed;
 112
 113 static const KVMCapabilityInfo kvm_required_capabilites[] = {
 114     KVM_CAP_INFO(USER_MEMORY),
 115     KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS),
 116     KVM_CAP_LAST_INFO
 117 };
 118
 119 static KVMSlot *kvm_alloc_slot(KVMState *s)
 120 {
 121     int i;
 122
 123     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 124         if (s->slots[i].memory_size == 0) {
 125             return &s->slots[i];
 126         }
 127     }
 128
 129     fprintf(stderr, "%s: no free slot available\n", __func__);
 130     abort();
 131 }
 132
 133 static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
 134                                          hwaddr start_addr,
 135                                          hwaddr end_addr)
 136 {
 137     int i;
 138
 139     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 140         KVMSlot *mem = &s->slots[i];
 141
 142         if (start_addr == mem->start_addr &&
 143             end_addr == mem->start_addr + mem->memory_size) {
 144             return mem;
 145         }
 146     }
 147
 148     return NULL;
 149 }
 150
 151 /*
 152  * Find overlapping slot with lowest start address
 153  */
 154 static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s,
 155                                             hwaddr start_addr,
 156                                             hwaddr end_addr)
 157 {
 158     KVMSlot *found = NULL;
 159     int i;
 160
 161     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 162         KVMSlot *mem = &s->slots[i];
 163
 164         if (mem->memory_size == 0 ||
 165             (found && found->start_addr < mem->start_addr)) {
 166             continue;
 167         }
 168
 169         if (end_addr > mem->start_addr &&
 170             start_addr < mem->start_addr + mem->memory_size) {
 171             found = mem;
 172         }
 173     }
 174
 175     return found;
 176 }
 177
 178 int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
 179                                        hwaddr *phys_addr)
 180 {
 181     int i;
 182
 183     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 184         KVMSlot *mem = &s->slots[i];
 185
 186         if (ram >= mem->ram && ram < mem->ram + mem->memory_size) {
 187             *phys_addr = mem->start_addr + (ram - mem->ram);
 188             return 1;
 189         }
 190     }
 191
 192     return 0;
 193 }
 194
 195 static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
 196 {
 197     struct kvm_userspace_memory_region mem;
 198
 199     mem.slot = slot->slot;
 200     mem.guest_phys_addr = slot->start_addr;
 201     mem.memory_size = slot->memory_size;
 202     mem.userspace_addr = (unsigned long)slot->ram;
 203     mem.flags = slot->flags;
 204     if (s->migration_log) {
 205         mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;
 206     }
 207     return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
 208 }
 209
 210 static void kvm_reset_vcpu(void *opaque)
 211 {
 212     CPUArchState *env = opaque;
 213
 214     kvm_arch_reset_vcpu(env);
 215 }
 216
 217 int kvm_init_vcpu(CPUArchState *env)
 218 {
 219     KVMState *s = kvm_state;
 220     long mmap_size;
 221     int ret;
 222
 223     DPRINTF("kvm_init_vcpu\n");
 224
 225     ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
 226     if (ret < 0) {
 227         DPRINTF("kvm_create_vcpu failed\n");
 228         goto err;
 229     }
 230
 231     env->kvm_fd = ret;
 232     env->kvm_state = s;
 233     env->kvm_vcpu_dirty = 1;
 234
 235     mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
 236     if (mmap_size < 0) {
 237         ret = mmap_size;
 238         DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
 239         goto err;
 240     }
 241
 242     env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
 243                         env->kvm_fd, 0);
 244     if (env->kvm_run == MAP_FAILED) {
 245         ret = -errno;
 246         DPRINTF("mmap'ing vcpu state failed\n");
 247         goto err;
 248     }
 249
 250     if (s->coalesced_mmio && !s->coalesced_mmio_ring) {
 251         s->coalesced_mmio_ring =
 252             (void *)env->kvm_run + s->coalesced_mmio * PAGE_SIZE;
 253     }
 254
 255     ret = kvm_arch_init_vcpu(env);
 256     if (ret == 0) {
 257         qemu_register_reset(kvm_reset_vcpu, env);
 258         kvm_arch_reset_vcpu(env);
 259     }
 260 err:
 261     return ret;
 262 }
 263
 264 /*
 265  * dirty pages logging control
 266  */
 267
 268 static int kvm_mem_flags(KVMState *s, bool log_dirty)
 269 {
 270     return log_dirty ? KVM_MEM_LOG_DIRTY_PAGES : 0;
 271 }
 272
 273 static int kvm_slot_dirty_pages_log_change(KVMSlot *mem, bool log_dirty)
 274 {
 275     KVMState *s = kvm_state;
 276     int flags, mask = KVM_MEM_LOG_DIRTY_PAGES;
 277     int old_flags;
 278
 279     old_flags = mem->flags;
 280
 281     flags = (mem->flags & ~mask) | kvm_mem_flags(s, log_dirty);
 282     mem->flags = flags;
 283
 284     /* If nothing changed effectively, no need to issue ioctl */
 285     if (s->migration_log) {
 286         flags |= KVM_MEM_LOG_DIRTY_PAGES;
 287     }
 288
 289     if (flags == old_flags) {
 290         return 0;
 291     }
 292
 293     return kvm_set_user_memory_region(s, mem);
 294 }
 295
 296 static int kvm_dirty_pages_log_change(hwaddr phys_addr,
 297                                       ram_addr_t size, bool log_dirty)
 298 {
 299     KVMState *s = kvm_state;
 300     KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
 301
 302     if (mem == NULL)  {
 303         fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
 304                 TARGET_FMT_plx "\n", __func__, phys_addr,
 305                 (hwaddr)(phys_addr + size - 1));
 306         return -EINVAL;
 307     }
 308     return kvm_slot_dirty_pages_log_change(mem, log_dirty);
 309 }
 310
 311 static void kvm_log_start(MemoryListener *listener,
 312                           MemoryRegionSection *section)
 313 {
 314     int r;
 315
 316     r = kvm_dirty_pages_log_change(section->offset_within_address_space,
 317                                    section->size, true);
 318     if (r < 0) {
 319         abort();
 320     }
 321 }
 322
 323 static void kvm_log_stop(MemoryListener *listener,
 324                           MemoryRegionSection *section)
 325 {
 326     int r;
 327
 328     r = kvm_dirty_pages_log_change(section->offset_within_address_space,
 329                                    section->size, false);
 330     if (r < 0) {
 331         abort();
 332     }
 333 }
 334
 335 static int kvm_set_migration_log(int enable)
 336 {
 337     KVMState *s = kvm_state;
 338     KVMSlot *mem;
 339     int i, err;
 340
 341     s->migration_log = enable;
 342
 343     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 344         mem = &s->slots[i];
 345
 346         if (!mem->memory_size) {
 347             continue;
 348         }
 349         if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
 350             continue;
 351         }
 352         err = kvm_set_user_memory_region(s, mem);
 353         if (err) {
 354             return err;
 355         }
 356     }
 357     return 0;
 358 }
 359
 360 /* get kvm's dirty pages bitmap and update qemu's */
 361 static int kvm_get_dirty_pages_log_range(MemoryRegionSection *section,
 362                                          unsigned long *bitmap)
 363 {
 364     unsigned int i, j;
 365     unsigned long page_number, c;
 366     hwaddr addr, addr1;
 367     unsigned int len = ((section->size / TARGET_PAGE_SIZE) + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
 368     unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE;
 369
 370     /*
 371      * bitmap-traveling is faster than memory-traveling (for addr...)
 372      * especially when most of the memory is not dirty.
 373      */
 374     for (i = 0; i < len; i++) {
 375         if (bitmap[i] != 0) {
 376             c = leul_to_cpu(bitmap[i]);
 377             do {
 378                 j = ffsl(c) - 1;
 379                 c &= ~(1ul << j);
 380                 page_number = (i * HOST_LONG_BITS + j) * hpratio;
 381                 addr1 = page_number * TARGET_PAGE_SIZE;
 382                 addr = section->offset_within_region + addr1;
 383                 memory_region_set_dirty(section->mr, addr,
 384                                         TARGET_PAGE_SIZE * hpratio);
 385             } while (c != 0);
 386         }
 387     }
 388     return 0;
 389 }
 390
 391 #define ALIGN(x, y)  (((x)+(y)-1) & ~((y)-1))
 392
 393 /**
 394  * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
 395  * This function updates qemu's dirty bitmap using
 396  * memory_region_set_dirty().  This means all bits are set
 397  * to dirty.
 398  *
 399  * @start_add: start of logged region.
 400  * @end_addr: end of logged region.
 401  */
 402 static int kvm_physical_sync_dirty_bitmap(MemoryRegionSection *section)
 403 {
 404     KVMState *s = kvm_state;
 405     unsigned long size, allocated_size = 0;
 406     KVMDirtyLog d;
 407     KVMSlot *mem;
 408     int ret = 0;
 409     hwaddr start_addr = section->offset_within_address_space;
 410     hwaddr end_addr = start_addr + section->size;
 411
 412     d.dirty_bitmap = NULL;
 413     while (start_addr < end_addr) {
 414         mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);
 415         if (mem == NULL) {
 416             break;
 417         }
 418
 419         /* XXX bad kernel interface alert
 420          * For dirty bitmap, kernel allocates array of size aligned to
 421          * bits-per-long.  But for case when the kernel is 64bits and
 422          * the userspace is 32bits, userspace can't align to the same
 423          * bits-per-long, since sizeof(long) is different between kernel
 424          * and user space.  This way, userspace will provide buffer which
 425          * may be 4 bytes less than the kernel will use, resulting in
 426          * userspace memory corruption (which is not detectable by valgrind
 427          * too, in most cases).
 428          * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
 429          * a hope that sizeof(long) wont become >8 any time soon.
 430          */
 431         size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),
 432                      /*HOST_LONG_BITS*/ 64) / 8;
 433         if (!d.dirty_bitmap) {
 434             d.dirty_bitmap = g_malloc(size);
 435         } else if (size > allocated_size) {
 436             d.dirty_bitmap = g_realloc(d.dirty_bitmap, size);
 437         }
 438         allocated_size = size;
 439         memset(d.dirty_bitmap, 0, allocated_size);
 440
 441         d.slot = mem->slot;
 442
 443         if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
 444             DPRINTF("ioctl failed %d\n", errno);
 445             ret = -1;
 446             break;
 447         }
 448
 449         kvm_get_dirty_pages_log_range(section, d.dirty_bitmap);
 450         start_addr = mem->start_addr + mem->memory_size;
 451     }
 452     g_free(d.dirty_bitmap);
 453
 454     return ret;
 455 }
 456
 457 static void kvm_coalesce_mmio_region(MemoryListener *listener,
 458                                      MemoryRegionSection *secion,
 459                                      hwaddr start, hwaddr size)
 460 {
 461     KVMState *s = kvm_state;
 462
 463     if (s->coalesced_mmio) {
 464         struct kvm_coalesced_mmio_zone zone;
 465
 466         zone.addr = start;
 467         zone.size = size;
 468         zone.pad = 0;
 469
 470         (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
 471     }
 472 }
 473
 474 static void kvm_uncoalesce_mmio_region(MemoryListener *listener,
 475                                        MemoryRegionSection *secion,
 476                                        hwaddr start, hwaddr size)
 477 {
 478     KVMState *s = kvm_state;
 479
 480     if (s->coalesced_mmio) {
 481         struct kvm_coalesced_mmio_zone zone;
 482
 483         zone.addr = start;
 484         zone.size = size;
 485         zone.pad = 0;
 486
 487         (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
 488     }
 489 }
 490
 491 int kvm_check_extension(KVMState *s, unsigned int extension)
 492 {
 493     int ret;
 494
 495     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
 496     if (ret < 0) {
 497         ret = 0;
 498     }
 499
 500     return ret;
 501 }
 502
 503 static int kvm_check_many_ioeventfds(void)
 504 {
 505     /* Userspace can use ioeventfd for io notification.  This requires a host
 506      * that supports eventfd(2) and an I/O thread; since eventfd does not
 507      * support SIGIO it cannot interrupt the vcpu.
 508      *
 509      * Older kernels have a 6 device limit on the KVM io bus.  Find out so we
 510      * can avoid creating too many ioeventfds.
 511      */
 512 #if defined(CONFIG_EVENTFD)
 513     int ioeventfds[7];
 514     int i, ret = 0;
 515     for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) {
 516         ioeventfds[i] = eventfd(0, EFD_CLOEXEC);
 517         if (ioeventfds[i] < 0) {
 518             break;
 519         }
 520         ret = kvm_set_ioeventfd_pio_word(ioeventfds[i], 0, i, true);
 521         if (ret < 0) {
 522             close(ioeventfds[i]);
 523             break;
 524         }
 525     }
 526
 527     /* Decide whether many devices are supported or not */
 528     ret = i == ARRAY_SIZE(ioeventfds);
 529
 530     while (i-- > 0) {
 531         kvm_set_ioeventfd_pio_word(ioeventfds[i], 0, i, false);
 532         close(ioeventfds[i]);
 533     }
 534     return ret;
 535 #else
 536     return 0;
 537 #endif
 538 }
 539
 540 static const KVMCapabilityInfo *
 541 kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list)
 542 {
 543     while (list->name) {
 544         if (!kvm_check_extension(s, list->value)) {
 545             return list;
 546         }
 547         list++;
 548     }
 549     return NULL;
 550 }
 551
 552 static void kvm_set_phys_mem(MemoryRegionSection *section, bool add)
 553 {
 554     KVMState *s = kvm_state;
 555     KVMSlot *mem, old;
 556     int err;
 557     MemoryRegion *mr = section->mr;
 558     bool log_dirty = memory_region_is_logging(mr);
 559     hwaddr start_addr = section->offset_within_address_space;
 560     ram_addr_t size = section->size;
 561     void *ram = NULL;
 562     unsigned delta;
 563
 564     /* kvm works in page size chunks, but the function may be called
 565        with sub-page size and unaligned start address. */
 566     delta = TARGET_PAGE_ALIGN(size) - size;
 567     if (delta > size) {
 568         return;
 569     }
 570     start_addr += delta;
 571     size -= delta;
 572     size &= TARGET_PAGE_MASK;
 573     if (!size || (start_addr & ~TARGET_PAGE_MASK)) {
 574         return;
 575     }
 576
 577     if (!memory_region_is_ram(mr)) {
 578         return;
 579     }
 580
 581     ram = memory_region_get_ram_ptr(mr) + section->offset_within_region + delta;
 582
 583     while (1) {
 584         mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);
 585         if (!mem) {
 586             break;
 587         }
 588
 589         if (add && start_addr >= mem->start_addr &&
 590             (start_addr + size <= mem->start_addr + mem->memory_size) &&
 591             (ram - start_addr == mem->ram - mem->start_addr)) {
 592             /* The new slot fits into the existing one and comes with
 593              * identical parameters - update flags and done. */
 594             kvm_slot_dirty_pages_log_change(mem, log_dirty);
 595             return;
 596         }
 597
 598         old = *mem;
 599
 600         if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
 601             kvm_physical_sync_dirty_bitmap(section);
 602         }
 603
 604         /* unregister the overlapping slot */
 605         mem->memory_size = 0;
 606         err = kvm_set_user_memory_region(s, mem);
 607         if (err) {
 608             fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
 609                     __func__, strerror(-err));
 610             abort();
 611         }
 612
 613         /* Workaround for older KVM versions: we can't join slots, even not by
 614          * unregistering the previous ones and then registering the larger
 615          * slot. We have to maintain the existing fragmentation. Sigh.
 616          *
 617          * This workaround assumes that the new slot starts at the same
 618          * address as the first existing one. If not or if some overlapping
 619          * slot comes around later, we will fail (not seen in practice so far)
 620          * - and actually require a recent KVM version. */
 621         if (s->broken_set_mem_region &&
 622             old.start_addr == start_addr && old.memory_size < size && add) {
 623             mem = kvm_alloc_slot(s);
 624             mem->memory_size = old.memory_size;
 625             mem->start_addr = old.start_addr;
 626             mem->ram = old.ram;
 627             mem->flags = kvm_mem_flags(s, log_dirty);
 628
 629             err = kvm_set_user_memory_region(s, mem);
 630             if (err) {
 631                 fprintf(stderr, "%s: error updating slot: %s\n", __func__,
 632                         strerror(-err));
 633                 abort();
 634             }
 635
 636             start_addr += old.memory_size;
 637             ram += old.memory_size;
 638             size -= old.memory_size;
 639             continue;
 640         }
 641
 642         /* register prefix slot */
 643         if (old.start_addr < start_addr) {
 644             mem = kvm_alloc_slot(s);
 645             mem->memory_size = start_addr - old.start_addr;
 646             mem->start_addr = old.start_addr;
 647             mem->ram = old.ram;
 648             mem->flags =  kvm_mem_flags(s, log_dirty);
 649
 650             err = kvm_set_user_memory_region(s, mem);
 651             if (err) {
 652                 fprintf(stderr, "%s: error registering prefix slot: %s\n",
 653                         __func__, strerror(-err));
 654 #ifdef TARGET_PPC
 655                 fprintf(stderr, "%s: This is probably because your kernel's " \
 656                                 "PAGE_SIZE is too big. Please try to use 4k " \
 657                                 "PAGE_SIZE!\n", __func__);
 658 #endif
 659                 abort();
 660             }
 661         }
 662
 663         /* register suffix slot */
 664         if (old.start_addr + old.memory_size > start_addr + size) {
 665             ram_addr_t size_delta;
 666
 667             mem = kvm_alloc_slot(s);
 668             mem->start_addr = start_addr + size;
 669             size_delta = mem->start_addr - old.start_addr;
 670             mem->memory_size = old.memory_size - size_delta;
 671             mem->ram = old.ram + size_delta;
 672             mem->flags = kvm_mem_flags(s, log_dirty);
 673
 674             err = kvm_set_user_memory_region(s, mem);
 675             if (err) {
 676                 fprintf(stderr, "%s: error registering suffix slot: %s\n",
 677                         __func__, strerror(-err));
 678                 abort();
 679             }
 680         }
 681     }
 682
 683     /* in case the KVM bug workaround already "consumed" the new slot */
 684     if (!size) {
 685         return;
 686     }
 687     if (!add) {
 688         return;
 689     }
 690     mem = kvm_alloc_slot(s);
 691     mem->memory_size = size;
 692     mem->start_addr = start_addr;
 693     mem->ram = ram;
 694     mem->flags = kvm_mem_flags(s, log_dirty);
 695
 696     err = kvm_set_user_memory_region(s, mem);
 697     if (err) {
 698         fprintf(stderr, "%s: error registering slot: %s\n", __func__,
 699                 strerror(-err));
 700         abort();
 701     }
 702 }
 703
 704 static void kvm_region_add(MemoryListener *listener,
 705                            MemoryRegionSection *section)
 706 {
 707     kvm_set_phys_mem(section, true);
 708 }
 709
 710 static void kvm_region_del(MemoryListener *listener,
 711                            MemoryRegionSection *section)
 712 {
 713     kvm_set_phys_mem(section, false);
 714 }
 715
 716 static void kvm_log_sync(MemoryListener *listener,
 717                          MemoryRegionSection *section)
 718 {
 719     int r;
 720
 721     r = kvm_physical_sync_dirty_bitmap(section);
 722     if (r < 0) {
 723         abort();
 724     }
 725 }
 726
 727 static void kvm_log_global_start(struct MemoryListener *listener)
 728 {
 729     int r;
 730
 731     r = kvm_set_migration_log(1);
 732     assert(r >= 0);
 733 }
 734
 735 static void kvm_log_global_stop(struct MemoryListener *listener)
 736 {
 737     int r;
 738
 739     r = kvm_set_migration_log(0);
 740     assert(r >= 0);
 741 }
 742
 743 static void kvm_mem_ioeventfd_add(MemoryListener *listener,
 744                                   MemoryRegionSection *section,
 745                                   bool match_data, uint64_t data,
 746                                   EventNotifier *e)
 747 {
 748     int fd = event_notifier_get_fd(e);
 749     int r;
 750
 751     assert(match_data && section->size <= 8);
 752
 753     r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
 754                                data, true, section->size);
 755     if (r < 0) {
 756         abort();
 757     }
 758 }
 759
 760 static void kvm_mem_ioeventfd_del(MemoryListener *listener,
 761                                   MemoryRegionSection *section,
 762                                   bool match_data, uint64_t data,
 763                                   EventNotifier *e)
 764 {
 765     int fd = event_notifier_get_fd(e);
 766     int r;
 767
 768     r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
 769                                data, false, section->size);
 770     if (r < 0) {
 771         abort();
 772     }
 773 }
 774
 775 static void kvm_io_ioeventfd_add(MemoryListener *listener,
 776                                  MemoryRegionSection *section,
 777                                  bool match_data, uint64_t data,
 778                                  EventNotifier *e)
 779 {
 780     int fd = event_notifier_get_fd(e);
 781     int r;
 782
 783     assert(match_data && section->size == 2);
 784
 785     r = kvm_set_ioeventfd_pio_word(fd, section->offset_within_address_space,
 786                                    data, true);
 787     if (r < 0) {
 788         abort();
 789     }
 790 }
 791
 792 static void kvm_io_ioeventfd_del(MemoryListener *listener,
 793                                  MemoryRegionSection *section,
 794                                  bool match_data, uint64_t data,
 795                                  EventNotifier *e)
 796
 797 {
 798     int fd = event_notifier_get_fd(e);
 799     int r;
 800
 801     r = kvm_set_ioeventfd_pio_word(fd, section->offset_within_address_space,
 802                                    data, false);
 803     if (r < 0) {
 804         abort();
 805     }
 806 }
 807
 808 static MemoryListener kvm_memory_listener = {
 809     .region_add = kvm_region_add,
 810     .region_del = kvm_region_del,
 811     .log_start = kvm_log_start,
 812     .log_stop = kvm_log_stop,
 813     .log_sync = kvm_log_sync,
 814     .log_global_start = kvm_log_global_start,
 815     .log_global_stop = kvm_log_global_stop,
 816     .eventfd_add = kvm_mem_ioeventfd_add,
 817     .eventfd_del = kvm_mem_ioeventfd_del,
 818     .coalesced_mmio_add = kvm_coalesce_mmio_region,
 819     .coalesced_mmio_del = kvm_uncoalesce_mmio_region,
 820     .priority = 10,
 821 };
 822
 823 static MemoryListener kvm_io_listener = {
 824     .eventfd_add = kvm_io_ioeventfd_add,
 825     .eventfd_del = kvm_io_ioeventfd_del,
 826     .priority = 10,
 827 };
 828
 829 static void kvm_handle_interrupt(CPUArchState *env, int mask)
 830 {
 831     CPUState *cpu = ENV_GET_CPU(env);
 832
 833     env->interrupt_request |= mask;
 834
 835     if (!qemu_cpu_is_self(cpu)) {
 836         qemu_cpu_kick(cpu);
 837     }
 838 }
 839
 840 int kvm_set_irq(KVMState *s, int irq, int level)
 841 {
 842     struct kvm_irq_level event;
 843     int ret;
 844
 845     assert(kvm_async_interrupts_enabled());
 846
 847     event.level = level;
 848     event.irq = irq;
 849     ret = kvm_vm_ioctl(s, s->irq_set_ioctl, &event);
 850     if (ret < 0) {
 851         perror("kvm_set_irq");
 852         abort();
 853     }
 854
 855     return (s->irq_set_ioctl == KVM_IRQ_LINE) ? 1 : event.status;
 856 }
 857
 858 #ifdef KVM_CAP_IRQ_ROUTING
 859 typedef struct KVMMSIRoute {
 860     struct kvm_irq_routing_entry kroute;
 861     QTAILQ_ENTRY(KVMMSIRoute) entry;
 862 } KVMMSIRoute;
 863
 864 static void set_gsi(KVMState *s, unsigned int gsi)
 865 {
 866     s->used_gsi_bitmap[gsi / 32] |= 1U << (gsi % 32);
 867 }
 868
 869 static void clear_gsi(KVMState *s, unsigned int gsi)
 870 {
 871     s->used_gsi_bitmap[gsi / 32] &= ~(1U << (gsi % 32));
 872 }
 873
 874 static void kvm_init_irq_routing(KVMState *s)
 875 {
 876     int gsi_count, i;
 877
 878     gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING);
 879     if (gsi_count > 0) {
 880         unsigned int gsi_bits, i;
 881
 882         /* Round up so we can search ints using ffs */
 883         gsi_bits = ALIGN(gsi_count, 32);
 884         s->used_gsi_bitmap = g_malloc0(gsi_bits / 8);
 885         s->gsi_count = gsi_count;
 886
 887         /* Mark any over-allocated bits as already in use */
 888         for (i = gsi_count; i < gsi_bits; i++) {
 889             set_gsi(s, i);
 890         }
 891     }
 892
 893     s->irq_routes = g_malloc0(sizeof(*s->irq_routes));
 894     s->nr_allocated_irq_routes = 0;
 895
 896     if (!s->direct_msi) {
 897         for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) {
 898             QTAILQ_INIT(&s->msi_hashtab[i]);
 899         }
 900     }
 901
 902     kvm_arch_init_irq_routing(s);
 903 }
 904
 905 static void kvm_irqchip_commit_routes(KVMState *s)
 906 {
 907     int ret;
 908
 909     s->irq_routes->flags = 0;
 910     ret = kvm_vm_ioctl(s, KVM_SET_GSI_ROUTING, s->irq_routes);
 911     assert(ret == 0);
 912 }
 913
 914 static void kvm_add_routing_entry(KVMState *s,
 915                                   struct kvm_irq_routing_entry *entry)
 916 {
 917     struct kvm_irq_routing_entry *new;
 918     int n, size;
 919
 920     if (s->irq_routes->nr == s->nr_allocated_irq_routes) {
 921         n = s->nr_allocated_irq_routes * 2;
 922         if (n < 64) {
 923             n = 64;
 924         }
 925         size = sizeof(struct kvm_irq_routing);
 926         size += n * sizeof(*new);
 927         s->irq_routes = g_realloc(s->irq_routes, size);
 928         s->nr_allocated_irq_routes = n;
 929     }
 930     n = s->irq_routes->nr++;
 931     new = &s->irq_routes->entries[n];
 932     memset(new, 0, sizeof(*new));
 933     new->gsi = entry->gsi;
 934     new->type = entry->type;
 935     new->flags = entry->flags;
 936     new->u = entry->u;
 937
 938     set_gsi(s, entry->gsi);
 939
 940     kvm_irqchip_commit_routes(s);
 941 }
 942
 943 static int kvm_update_routing_entry(KVMState *s,
 944                                     struct kvm_irq_routing_entry *new_entry)
 945 {
 946     struct kvm_irq_routing_entry *entry;
 947     int n;
 948
 949     for (n = 0; n < s->irq_routes->nr; n++) {
 950         entry = &s->irq_routes->entries[n];
 951         if (entry->gsi != new_entry->gsi) {
 952             continue;
 953         }
 954
 955         entry->type = new_entry->type;
 956         entry->flags = new_entry->flags;
 957         entry->u = new_entry->u;
 958
 959         kvm_irqchip_commit_routes(s);
 960
 961         return 0;
 962     }
 963
 964     return -ESRCH;
 965 }
 966
 967 void kvm_irqchip_add_irq_route(KVMState *s, int irq, int irqchip, int pin)
 968 {
 969     struct kvm_irq_routing_entry e;
 970
 971     assert(pin < s->gsi_count);
 972
 973     e.gsi = irq;
 974     e.type = KVM_IRQ_ROUTING_IRQCHIP;
 975     e.flags = 0;
 976     e.u.irqchip.irqchip = irqchip;
 977     e.u.irqchip.pin = pin;
 978     kvm_add_routing_entry(s, &e);
 979 }
 980
 981 void kvm_irqchip_release_virq(KVMState *s, int virq)
 982 {
 983     struct kvm_irq_routing_entry *e;
 984     int i;
 985
 986     for (i = 0; i < s->irq_routes->nr; i++) {
 987         e = &s->irq_routes->entries[i];
 988         if (e->gsi == virq) {
 989             s->irq_routes->nr--;
 990             *e = s->irq_routes->entries[s->irq_routes->nr];
 991         }
 992     }
 993     clear_gsi(s, virq);
 994
 995     kvm_irqchip_commit_routes(s);
 996 }
 997
 998 static unsigned int kvm_hash_msi(uint32_t data)
 999 {
1000     /* This is optimized for IA32 MSI layout. However, no other arch shall
1001      * repeat the mistake of not providing a direct MSI injection API. */
1002     return data & 0xff;
1003 }
1004
1005 static void kvm_flush_dynamic_msi_routes(KVMState *s)
1006 {
1007     KVMMSIRoute *route, *next;
1008     unsigned int hash;
1009
1010     for (hash = 0; hash < KVM_MSI_HASHTAB_SIZE; hash++) {
1011         QTAILQ_FOREACH_SAFE(route, &s->msi_hashtab[hash], entry, next) {
1012             kvm_irqchip_release_virq(s, route->kroute.gsi);
1013             QTAILQ_REMOVE(&s->msi_hashtab[hash], route, entry);
1014             g_free(route);
1015         }
1016     }
1017 }
1018
1019 static int kvm_irqchip_get_virq(KVMState *s)
1020 {
1021     uint32_t *word = s->used_gsi_bitmap;
1022     int max_words = ALIGN(s->gsi_count, 32) / 32;
1023     int i, bit;
1024     bool retry = true;
1025
1026 again:
1027     /* Return the lowest unused GSI in the bitmap */
1028     for (i = 0; i < max_words; i++) {
1029         bit = ffs(~word[i]);
1030         if (!bit) {
1031             continue;
1032         }
1033
1034         return bit - 1 + i * 32;
1035     }
1036     if (!s->direct_msi && retry) {
1037         retry = false;
1038         kvm_flush_dynamic_msi_routes(s);
1039         goto again;
1040     }
1041     return -ENOSPC;
1042
1043 }
1044
1045 static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s, MSIMessage msg)
1046 {
1047     unsigned int hash = kvm_hash_msi(msg.data);
1048     KVMMSIRoute *route;
1049
1050     QTAILQ_FOREACH(route, &s->msi_hashtab[hash], entry) {
1051         if (route->kroute.u.msi.address_lo == (uint32_t)msg.address &&
1052             route->kroute.u.msi.address_hi == (msg.address >> 32) &&
1053             route->kroute.u.msi.data == msg.data) {
1054             return route;
1055         }
1056     }
1057     return NULL;
1058 }
1059
1060 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1061 {
1062     struct kvm_msi msi;
1063     KVMMSIRoute *route;
1064
1065     if (s->direct_msi) {
1066         msi.address_lo = (uint32_t)msg.address;
1067         msi.address_hi = msg.address >> 32;
1068         msi.data = msg.data;
1069         msi.flags = 0;
1070         memset(msi.pad, 0, sizeof(msi.pad));
1071
1072         return kvm_vm_ioctl(s, KVM_SIGNAL_MSI, &msi);
1073     }
1074
1075     route = kvm_lookup_msi_route(s, msg);
1076     if (!route) {
1077         int virq;
1078
1079         virq = kvm_irqchip_get_virq(s);
1080         if (virq < 0) {
1081             return virq;
1082         }
1083
1084         route = g_malloc(sizeof(KVMMSIRoute));
1085         route->kroute.gsi = virq;
1086         route->kroute.type = KVM_IRQ_ROUTING_MSI;
1087         route->kroute.flags = 0;
1088         route->kroute.u.msi.address_lo = (uint32_t)msg.address;
1089         route->kroute.u.msi.address_hi = msg.address >> 32;
1090         route->kroute.u.msi.data = msg.data;
1091
1092         kvm_add_routing_entry(s, &route->kroute);
1093
1094         QTAILQ_INSERT_TAIL(&s->msi_hashtab[kvm_hash_msi(msg.data)], route,
1095                            entry);
1096     }
1097
1098     assert(route->kroute.type == KVM_IRQ_ROUTING_MSI);
1099
1100     return kvm_set_irq(s, route->kroute.gsi, 1);
1101 }
1102
1103 int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
1104 {
1105     struct kvm_irq_routing_entry kroute;
1106     int virq;
1107
1108     if (!kvm_gsi_routing_enabled()) {
1109         return -ENOSYS;
1110     }
1111
1112     virq = kvm_irqchip_get_virq(s);
1113     if (virq < 0) {
1114         return virq;
1115     }
1116
1117     kroute.gsi = virq;
1118     kroute.type = KVM_IRQ_ROUTING_MSI;
1119     kroute.flags = 0;
1120     kroute.u.msi.address_lo = (uint32_t)msg.address;
1121     kroute.u.msi.address_hi = msg.address >> 32;
1122     kroute.u.msi.data = msg.data;
1123
1124     kvm_add_routing_entry(s, &kroute);
1125
1126     return virq;
1127 }
1128
1129 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg)
1130 {
1131     struct kvm_irq_routing_entry kroute;
1132
1133     if (!kvm_irqchip_in_kernel()) {
1134         return -ENOSYS;
1135     }
1136
1137     kroute.gsi = virq;
1138     kroute.type = KVM_IRQ_ROUTING_MSI;
1139     kroute.flags = 0;
1140     kroute.u.msi.address_lo = (uint32_t)msg.address;
1141     kroute.u.msi.address_hi = msg.address >> 32;
1142     kroute.u.msi.data = msg.data;
1143
1144     return kvm_update_routing_entry(s, &kroute);
1145 }
1146
1147 static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
1148 {
1149     struct kvm_irqfd irqfd = {
1150         .fd = fd,
1151         .gsi = virq,
1152         .flags = assign ? 0 : KVM_IRQFD_FLAG_DEASSIGN,
1153     };
1154
1155     if (!kvm_irqfds_enabled()) {
1156         return -ENOSYS;
1157     }
1158
1159     return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
1160 }
1161
1162 #else /* !KVM_CAP_IRQ_ROUTING */
1163
1164 static void kvm_init_irq_routing(KVMState *s)
1165 {
1166 }
1167
1168 void kvm_irqchip_release_virq(KVMState *s, int virq)
1169 {
1170 }
1171
1172 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1173 {
1174     abort();
1175 }
1176
1177 int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
1178 {
1179     return -ENOSYS;
1180 }
1181
1182 static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
1183 {
1184     abort();
1185 }
1186 #endif /* !KVM_CAP_IRQ_ROUTING */
1187
1188 int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n, int virq)
1189 {
1190     return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n), virq, true);
1191 }
1192
1193 int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, int virq)
1194 {
1195     return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n), virq, false);
1196 }
1197
1198 static int kvm_irqchip_create(KVMState *s)
1199 {
1200     QemuOptsList *list = qemu_find_opts("machine");
1201     int ret;
1202
1203     if (QTAILQ_EMPTY(&list->head) ||
1204         !qemu_opt_get_bool(QTAILQ_FIRST(&list->head),
1205                            "kernel_irqchip", true) ||
1206         !kvm_check_extension(s, KVM_CAP_IRQCHIP)) {
1207         return 0;
1208     }
1209
1210     ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP);
1211     if (ret < 0) {
1212         fprintf(stderr, "Create kernel irqchip failed\n");
1213         return ret;
1214     }
1215
1216     kvm_kernel_irqchip = true;
1217     /* If we have an in-kernel IRQ chip then we must have asynchronous
1218      * interrupt delivery (though the reverse is not necessarily true)
1219      */
1220     kvm_async_interrupts_allowed = true;
1221
1222     kvm_init_irq_routing(s);
1223
1224     return 0;
1225 }
1226
1227 static int kvm_max_vcpus(KVMState *s)
1228 {
1229     int ret;
1230
1231     /* Find number of supported CPUs using the recommended
1232      * procedure from the kernel API documentation to cope with
1233      * older kernels that may be missing capabilities.
1234      */
1235     ret = kvm_check_extension(s, KVM_CAP_MAX_VCPUS);
1236     if (ret) {
1237         return ret;
1238     }
1239     ret = kvm_check_extension(s, KVM_CAP_NR_VCPUS);
1240     if (ret) {
1241         return ret;
1242     }
1243
1244     return 4;
1245 }
1246
1247 int kvm_init(void)
1248 {
1249     static const char upgrade_note[] =
1250         "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
1251         "(see http://sourceforge.net/projects/kvm).\n";
1252     KVMState *s;
1253     const KVMCapabilityInfo *missing_cap;
1254     int ret;
1255     int i;
1256     int max_vcpus;
1257
1258     s = g_malloc0(sizeof(KVMState));
1259
1260     /*
1261      * On systems where the kernel can support different base page
1262      * sizes, host page size may be different from TARGET_PAGE_SIZE,
1263      * even with KVM.  TARGET_PAGE_SIZE is assumed to be the minimum
1264      * page size for the system though.
1265      */
1266     assert(TARGET_PAGE_SIZE <= getpagesize());
1267
1268 #ifdef KVM_CAP_SET_GUEST_DEBUG
1269     QTAILQ_INIT(&s->kvm_sw_breakpoints);
1270 #endif
1271     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
1272         s->slots[i].slot = i;
1273     }
1274     s->vmfd = -1;
1275     s->fd = qemu_open("/dev/kvm", O_RDWR);
1276     if (s->fd == -1) {
1277         fprintf(stderr, "Could not access KVM kernel module: %m\n");
1278         ret = -errno;
1279         goto err;
1280     }
1281
1282     ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
1283     if (ret < KVM_API_VERSION) {
1284         if (ret > 0) {
1285             ret = -EINVAL;
1286         }
1287         fprintf(stderr, "kvm version too old\n");
1288         goto err;
1289     }
1290
1291     if (ret > KVM_API_VERSION) {
1292         ret = -EINVAL;
1293         fprintf(stderr, "kvm version not supported\n");
1294         goto err;
1295     }
1296
1297     max_vcpus = kvm_max_vcpus(s);
1298     if (smp_cpus > max_vcpus) {
1299         ret = -EINVAL;
1300         fprintf(stderr, "Number of SMP cpus requested (%d) exceeds max cpus "
1301                 "supported by KVM (%d)\n", smp_cpus, max_vcpus);
1302         goto err;
1303     }
1304
1305     s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
1306     if (s->vmfd < 0) {
1307 #ifdef TARGET_S390X
1308         fprintf(stderr, "Please add the 'switch_amode' kernel parameter to "
1309                         "your host kernel command line\n");
1310 #endif
1311         ret = s->vmfd;
1312         goto err;
1313     }
1314
1315     missing_cap = kvm_check_extension_list(s, kvm_required_capabilites);
1316     if (!missing_cap) {
1317         missing_cap =
1318             kvm_check_extension_list(s, kvm_arch_required_capabilities);
1319     }
1320     if (missing_cap) {
1321         ret = -EINVAL;
1322         fprintf(stderr, "kvm does not support %s\n%s",
1323                 missing_cap->name, upgrade_note);
1324         goto err;
1325     }
1326
1327     s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
1328
1329     s->broken_set_mem_region = 1;
1330     ret = kvm_check_extension(s, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
1331     if (ret > 0) {
1332         s->broken_set_mem_region = 0;
1333     }
1334
1335 #ifdef KVM_CAP_VCPU_EVENTS
1336     s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
1337 #endif
1338
1339     s->robust_singlestep =
1340         kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
1341
1342 #ifdef KVM_CAP_DEBUGREGS
1343     s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
1344 #endif
1345
1346 #ifdef KVM_CAP_XSAVE
1347     s->xsave = kvm_check_extension(s, KVM_CAP_XSAVE);
1348 #endif
1349
1350 #ifdef KVM_CAP_XCRS
1351     s->xcrs = kvm_check_extension(s, KVM_CAP_XCRS);
1352 #endif
1353
1354 #ifdef KVM_CAP_PIT_STATE2
1355     s->pit_state2 = kvm_check_extension(s, KVM_CAP_PIT_STATE2);
1356 #endif
1357
1358 #ifdef KVM_CAP_IRQ_ROUTING
1359     s->direct_msi = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
1360 #endif
1361
1362     s->intx_set_mask = kvm_check_extension(s, KVM_CAP_PCI_2_3);
1363
1364     s->irq_set_ioctl = KVM_IRQ_LINE;
1365     if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) {
1366         s->irq_set_ioctl = KVM_IRQ_LINE_STATUS;
1367     }
1368
1369     ret = kvm_arch_init(s);
1370     if (ret < 0) {
1371         goto err;
1372     }
1373
1374     ret = kvm_irqchip_create(s);
1375     if (ret < 0) {
1376         goto err;
1377     }
1378
1379     kvm_state = s;
1380     memory_listener_register(&kvm_memory_listener, &address_space_memory);
1381     memory_listener_register(&kvm_io_listener, &address_space_io);
1382
1383     s->many_ioeventfds = kvm_check_many_ioeventfds();
1384
1385     cpu_interrupt_handler = kvm_handle_interrupt;
1386
1387     return 0;
1388
1389 err:
1390     if (s->vmfd >= 0) {
1391         close(s->vmfd);
1392     }
1393     if (s->fd != -1) {
1394         close(s->fd);
1395     }
1396     g_free(s);
1397
1398     return ret;
1399 }
1400
1401 static void kvm_handle_io(uint16_t port, void *data, int direction, int size,
1402                           uint32_t count)
1403 {
1404     int i;
1405     uint8_t *ptr = data;
1406
1407     for (i = 0; i < count; i++) {
1408         if (direction == KVM_EXIT_IO_IN) {
1409             switch (size) {
1410             case 1:
1411                 stb_p(ptr, cpu_inb(port));
1412                 break;
1413             case 2:
1414                 stw_p(ptr, cpu_inw(port));
1415                 break;
1416             case 4:
1417                 stl_p(ptr, cpu_inl(port));
1418                 break;
1419             }
1420         } else {
1421             switch (size) {
1422             case 1:
1423                 cpu_outb(port, ldub_p(ptr));
1424                 break;
1425             case 2:
1426                 cpu_outw(port, lduw_p(ptr));
1427                 break;
1428             case 4:
1429                 cpu_outl(port, ldl_p(ptr));
1430                 break;
1431             }
1432         }
1433
1434         ptr += size;
1435     }
1436 }
1437
1438 static int kvm_handle_internal_error(CPUArchState *env, struct kvm_run *run)
1439 {
1440     fprintf(stderr, "KVM internal error.");
1441     if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
1442         int i;
1443
1444         fprintf(stderr, " Suberror: %d\n", run->internal.suberror);
1445         for (i = 0; i < run->internal.ndata; ++i) {
1446             fprintf(stderr, "extra data[%d]: %"PRIx64"\n",
1447                     i, (uint64_t)run->internal.data[i]);
1448         }
1449     } else {
1450         fprintf(stderr, "\n");
1451     }
1452     if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
1453         fprintf(stderr, "emulation failure\n");
1454         if (!kvm_arch_stop_on_emulation_error(env)) {
1455             cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
1456             return EXCP_INTERRUPT;
1457         }
1458     }
1459     /* FIXME: Should trigger a qmp message to let management know
1460      * something went wrong.
1461      */
1462     return -1;
1463 }
1464
1465 void kvm_flush_coalesced_mmio_buffer(void)
1466 {
1467     KVMState *s = kvm_state;
1468
1469     if (s->coalesced_flush_in_progress) {
1470         return;
1471     }
1472
1473     s->coalesced_flush_in_progress = true;
1474
1475     if (s->coalesced_mmio_ring) {
1476         struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
1477         while (ring->first != ring->last) {
1478             struct kvm_coalesced_mmio *ent;
1479
1480             ent = &ring->coalesced_mmio[ring->first];
1481
1482             cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
1483             smp_wmb();
1484             ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
1485         }
1486     }
1487
1488     s->coalesced_flush_in_progress = false;
1489 }
1490
1491 static void do_kvm_cpu_synchronize_state(void *_env)
1492 {
1493     CPUArchState *env = _env;
1494
1495     if (!env->kvm_vcpu_dirty) {
1496         kvm_arch_get_registers(env);
1497         env->kvm_vcpu_dirty = 1;
1498     }
1499 }
1500
1501 void kvm_cpu_synchronize_state(CPUArchState *env)
1502 {
1503     CPUState *cpu = ENV_GET_CPU(env);
1504
1505     if (!env->kvm_vcpu_dirty) {
1506         run_on_cpu(cpu, do_kvm_cpu_synchronize_state, env);
1507     }
1508 }
1509
1510 void kvm_cpu_synchronize_post_reset(CPUArchState *env)
1511 {
1512     kvm_arch_put_registers(env, KVM_PUT_RESET_STATE);
1513     env->kvm_vcpu_dirty = 0;
1514 }
1515
1516 void kvm_cpu_synchronize_post_init(CPUArchState *env)
1517 {
1518     kvm_arch_put_registers(env, KVM_PUT_FULL_STATE);
1519     env->kvm_vcpu_dirty = 0;
1520 }
1521
1522 int kvm_cpu_exec(CPUArchState *env)
1523 {
1524     struct kvm_run *run = env->kvm_run;
1525     int ret, run_ret;
1526
1527     DPRINTF("kvm_cpu_exec()\n");
1528
1529     if (kvm_arch_process_async_events(env)) {
1530         env->exit_request = 0;
1531         return EXCP_HLT;
1532     }
1533
1534     do {
1535         if (env->kvm_vcpu_dirty) {
1536             kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);
1537             env->kvm_vcpu_dirty = 0;
1538         }
1539
1540         kvm_arch_pre_run(env, run);
1541         if (env->exit_request) {
1542             DPRINTF("interrupt exit requested\n");
1543             /*
1544              * KVM requires us to reenter the kernel after IO exits to complete
1545              * instruction emulation. This self-signal will ensure that we
1546              * leave ASAP again.
1547              */
1548             qemu_cpu_kick_self();
1549         }
1550         qemu_mutex_unlock_iothread();
1551
1552         run_ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
1553
1554         qemu_mutex_lock_iothread();
1555         kvm_arch_post_run(env, run);
1556
1557         if (run_ret < 0) {
1558             if (run_ret == -EINTR || run_ret == -EAGAIN) {
1559                 DPRINTF("io window exit\n");
1560                 ret = EXCP_INTERRUPT;
1561                 break;
1562             }
1563             fprintf(stderr, "error: kvm run failed %s\n",
1564                     strerror(-run_ret));
1565             abort();
1566         }
1567
1568         switch (run->exit_reason) {
1569         case KVM_EXIT_IO:
1570             DPRINTF("handle_io\n");
1571             kvm_handle_io(run->io.port,
1572                           (uint8_t *)run + run->io.data_offset,
1573                           run->io.direction,
1574                           run->io.size,
1575                           run->io.count);
1576             ret = 0;
1577             break;
1578         case KVM_EXIT_MMIO:
1579             DPRINTF("handle_mmio\n");
1580             cpu_physical_memory_rw(run->mmio.phys_addr,
1581                                    run->mmio.data,
1582                                    run->mmio.len,
1583                                    run->mmio.is_write);
1584             ret = 0;
1585             break;
1586         case KVM_EXIT_IRQ_WINDOW_OPEN:
1587             DPRINTF("irq_window_open\n");
1588             ret = EXCP_INTERRUPT;
1589             break;
1590         case KVM_EXIT_SHUTDOWN:
1591             DPRINTF("shutdown\n");
1592             qemu_system_reset_request();
1593             ret = EXCP_INTERRUPT;
1594             break;
1595         case KVM_EXIT_UNKNOWN:
1596             fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n",
1597                     (uint64_t)run->hw.hardware_exit_reason);
1598             ret = -1;
1599             break;
1600         case KVM_EXIT_INTERNAL_ERROR:
1601             ret = kvm_handle_internal_error(env, run);
1602             break;
1603         default:
1604             DPRINTF("kvm_arch_handle_exit\n");
1605             ret = kvm_arch_handle_exit(env, run);
1606             break;
1607         }
1608     } while (ret == 0);
1609
1610     if (ret < 0) {
1611         cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
1612         vm_stop(RUN_STATE_INTERNAL_ERROR);
1613     }
1614
1615     env->exit_request = 0;
1616     return ret;
1617 }
1618
1619 int kvm_ioctl(KVMState *s, int type, ...)
1620 {
1621     int ret;
1622     void *arg;
1623     va_list ap;
1624
1625     va_start(ap, type);
1626     arg = va_arg(ap, void *);
1627     va_end(ap);
1628
1629     ret = ioctl(s->fd, type, arg);
1630     if (ret == -1) {
1631         ret = -errno;
1632     }
1633     return ret;
1634 }
1635
1636 int kvm_vm_ioctl(KVMState *s, int type, ...)
1637 {
1638     int ret;
1639     void *arg;
1640     va_list ap;
1641
1642     va_start(ap, type);
1643     arg = va_arg(ap, void *);
1644     va_end(ap);
1645
1646     ret = ioctl(s->vmfd, type, arg);
1647     if (ret == -1) {
1648         ret = -errno;
1649     }
1650     return ret;
1651 }
1652
1653 int kvm_vcpu_ioctl(CPUArchState *env, int type, ...)
1654 {
1655     int ret;
1656     void *arg;
1657     va_list ap;
1658
1659     va_start(ap, type);
1660     arg = va_arg(ap, void *);
1661     va_end(ap);
1662
1663     ret = ioctl(env->kvm_fd, type, arg);
1664     if (ret == -1) {
1665         ret = -errno;
1666     }
1667     return ret;
1668 }
1669
1670 int kvm_has_sync_mmu(void)
1671 {
1672     return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
1673 }
1674
1675 int kvm_has_vcpu_events(void)
1676 {
1677     return kvm_state->vcpu_events;
1678 }
1679
1680 int kvm_has_robust_singlestep(void)
1681 {
1682     return kvm_state->robust_singlestep;
1683 }
1684
1685 int kvm_has_debugregs(void)
1686 {
1687     return kvm_state->debugregs;
1688 }
1689
1690 int kvm_has_xsave(void)
1691 {
1692     return kvm_state->xsave;
1693 }
1694
1695 int kvm_has_xcrs(void)
1696 {
1697     return kvm_state->xcrs;
1698 }
1699
1700 int kvm_has_pit_state2(void)
1701 {
1702     return kvm_state->pit_state2;
1703 }
1704
1705 int kvm_has_many_ioeventfds(void)
1706 {
1707     if (!kvm_enabled()) {
1708         return 0;
1709     }
1710     return kvm_state->many_ioeventfds;
1711 }
1712
1713 int kvm_has_gsi_routing(void)
1714 {
1715 #ifdef KVM_CAP_IRQ_ROUTING
1716     return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
1717 #else
1718     return false;
1719 #endif
1720 }
1721
1722 int kvm_has_intx_set_mask(void)
1723 {
1724     return kvm_state->intx_set_mask;
1725 }
1726
1727 void *kvm_vmalloc(ram_addr_t size)
1728 {
1729 #ifdef TARGET_S390X
1730     void *mem;
1731
1732     mem = kvm_arch_vmalloc(size);
1733     if (mem) {
1734         return mem;
1735     }
1736 #endif
1737     return qemu_vmalloc(size);
1738 }
1739
1740 void kvm_setup_guest_memory(void *start, size_t size)
1741 {
1742 #ifdef CONFIG_VALGRIND_H
1743     VALGRIND_MAKE_MEM_DEFINED(start, size);
1744 #endif
1745     if (!kvm_has_sync_mmu()) {
1746         int ret = qemu_madvise(start, size, QEMU_MADV_DONTFORK);
1747
1748         if (ret) {
1749             perror("qemu_madvise");
1750             fprintf(stderr,
1751                     "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
1752             exit(1);
1753         }
1754     }
1755 }
1756
1757 #ifdef KVM_CAP_SET_GUEST_DEBUG
1758 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUArchState *env,
1759                                                  target_ulong pc)
1760 {
1761     struct kvm_sw_breakpoint *bp;
1762
1763     QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) {
1764         if (bp->pc == pc) {
1765             return bp;
1766         }
1767     }
1768     return NULL;
1769 }
1770
1771 int kvm_sw_breakpoints_active(CPUArchState *env)
1772 {
1773     return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
1774 }
1775
1776 struct kvm_set_guest_debug_data {
1777     struct kvm_guest_debug dbg;
1778     CPUArchState *env;
1779     int err;
1780 };
1781
1782 static void kvm_invoke_set_guest_debug(void *data)
1783 {
1784     struct kvm_set_guest_debug_data *dbg_data = data;
1785     CPUArchState *env = dbg_data->env;
1786
1787     dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg);
1788 }
1789
1790 int kvm_update_guest_debug(CPUArchState *env, unsigned long reinject_trap)
1791 {
1792     CPUState *cpu = ENV_GET_CPU(env);
1793     struct kvm_set_guest_debug_data data;
1794
1795     data.dbg.control = reinject_trap;
1796
1797     if (env->singlestep_enabled) {
1798         data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
1799     }
1800     kvm_arch_update_guest_debug(env, &data.dbg);
1801     data.env = env;
1802
1803     run_on_cpu(cpu, kvm_invoke_set_guest_debug, &data);
1804     return data.err;
1805 }
1806
1807 int kvm_insert_breakpoint(CPUArchState *current_env, target_ulong addr,
1808                           target_ulong len, int type)
1809 {
1810     struct kvm_sw_breakpoint *bp;
1811     CPUArchState *env;
1812     int err;
1813
1814     if (type == GDB_BREAKPOINT_SW) {
1815         bp = kvm_find_sw_breakpoint(current_env, addr);
1816         if (bp) {
1817             bp->use_count++;
1818             return 0;
1819         }
1820
1821         bp = g_malloc(sizeof(struct kvm_sw_breakpoint));
1822         if (!bp) {
1823             return -ENOMEM;
1824         }
1825
1826         bp->pc = addr;
1827         bp->use_count = 1;
1828         err = kvm_arch_insert_sw_breakpoint(current_env, bp);
1829         if (err) {
1830             g_free(bp);
1831             return err;
1832         }
1833
1834         QTAILQ_INSERT_HEAD(&current_env->kvm_state->kvm_sw_breakpoints,
1835                           bp, entry);
1836     } else {
1837         err = kvm_arch_insert_hw_breakpoint(addr, len, type);
1838         if (err) {
1839             return err;
1840         }
1841     }
1842
1843     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1844         err = kvm_update_guest_debug(env, 0);
1845         if (err) {
1846             return err;
1847         }
1848     }
1849     return 0;
1850 }
1851
1852 int kvm_remove_breakpoint(CPUArchState *current_env, target_ulong addr,
1853                           target_ulong len, int type)
1854 {
1855     struct kvm_sw_breakpoint *bp;
1856     CPUArchState *env;
1857     int err;
1858
1859     if (type == GDB_BREAKPOINT_SW) {
1860         bp = kvm_find_sw_breakpoint(current_env, addr);
1861         if (!bp) {
1862             return -ENOENT;
1863         }
1864
1865         if (bp->use_count > 1) {
1866             bp->use_count--;
1867             return 0;
1868         }
1869
1870         err = kvm_arch_remove_sw_breakpoint(current_env, bp);
1871         if (err) {
1872             return err;
1873         }
1874
1875         QTAILQ_REMOVE(&current_env->kvm_state->kvm_sw_breakpoints, bp, entry);
1876         g_free(bp);
1877     } else {
1878         err = kvm_arch_remove_hw_breakpoint(addr, len, type);
1879         if (err) {
1880             return err;
1881         }
1882     }
1883
1884     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1885         err = kvm_update_guest_debug(env, 0);
1886         if (err) {
1887             return err;
1888         }
1889     }
1890     return 0;
1891 }
1892
1893 void kvm_remove_all_breakpoints(CPUArchState *current_env)
1894 {
1895     struct kvm_sw_breakpoint *bp, *next;
1896     KVMState *s = current_env->kvm_state;
1897     CPUArchState *env;
1898
1899     QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
1900         if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) {
1901             /* Try harder to find a CPU that currently sees the breakpoint. */
1902             for (env = first_cpu; env != NULL; env = env->next_cpu) {
1903                 if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) {
1904                     break;
1905                 }
1906             }
1907         }
1908     }
1909     kvm_arch_remove_all_hw_breakpoints();
1910
1911     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1912         kvm_update_guest_debug(env, 0);
1913     }
1914 }
1915
1916 #else /* !KVM_CAP_SET_GUEST_DEBUG */
1917
1918 int kvm_update_guest_debug(CPUArchState *env, unsigned long reinject_trap)
1919 {
1920     return -EINVAL;
1921 }
1922
1923 int kvm_insert_breakpoint(CPUArchState *current_env, target_ulong addr,
1924                           target_ulong len, int type)
1925 {
1926     return -EINVAL;
1927 }
1928
1929 int kvm_remove_breakpoint(CPUArchState *current_env, target_ulong addr,
1930                           target_ulong len, int type)
1931 {
1932     return -EINVAL;
1933 }
1934
1935 void kvm_remove_all_breakpoints(CPUArchState *current_env)
1936 {
1937 }
1938 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
1939
1940 int kvm_set_signal_mask(CPUArchState *env, const sigset_t *sigset)
1941 {
1942     struct kvm_signal_mask *sigmask;
1943     int r;
1944
1945     if (!sigset) {
1946         return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL);
1947     }
1948
1949     sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset));
1950
1951     sigmask->len = 8;
1952     memcpy(sigmask->sigset, sigset, sizeof(*sigset));
1953     r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask);
1954     g_free(sigmask);
1955
1956     return r;
1957 }
1958
1959 int kvm_set_ioeventfd_mmio(int fd, uint32_t addr, uint32_t val, bool assign,
1960                            uint32_t size)
1961 {
1962     int ret;
1963     struct kvm_ioeventfd iofd;
1964
1965     iofd.datamatch = val;
1966     iofd.addr = addr;
1967     iofd.len = size;
1968     iofd.flags = KVM_IOEVENTFD_FLAG_DATAMATCH;
1969     iofd.fd = fd;
1970
1971     if (!kvm_enabled()) {
1972         return -ENOSYS;
1973     }
1974
1975     if (!assign) {
1976         iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
1977     }
1978
1979     ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
1980
1981     if (ret < 0) {
1982         return -errno;
1983     }
1984
1985     return 0;
1986 }
1987
1988 int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
1989 {
1990     struct kvm_ioeventfd kick = {
1991         .datamatch = val,
1992         .addr = addr,
1993         .len = 2,
1994         .flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO,
1995         .fd = fd,
1996     };
1997     int r;
1998     if (!kvm_enabled()) {
1999         return -ENOSYS;
2000     }
2001     if (!assign) {
2002         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
2003     }
2004     r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
2005     if (r < 0) {
2006         return r;
2007     }
2008     return 0;
2009 }
2010
2011 int kvm_on_sigbus_vcpu(CPUArchState *env, int code, void *addr)
2012 {
2013     return kvm_arch_on_sigbus_vcpu(env, code, addr);
2014 }
2015
2016 int kvm_on_sigbus(int code, void *addr)
2017 {
2018     return kvm_arch_on_sigbus(code, addr);
2019 }