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 int kvm_allowed = 0;
  55
  56 struct KVMState
  57 {
  58     KVMSlot slots[32];
  59     int fd;
  60     int vmfd;
  61     int coalesced_mmio;
  62 #ifdef KVM_CAP_COALESCED_MMIO
  63     struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
  64 #endif
  65     int broken_set_mem_region;
  66     int migration_log;
  67     int vcpu_events;
  68     int robust_singlestep;
  69 #ifdef KVM_CAP_SET_GUEST_DEBUG
  70     struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
  71 #endif
  72     int irqchip_in_kernel;
  73     int pit_in_kernel;
  74 };
  75
  76 static KVMState *kvm_state;
  77
  78 static KVMSlot *kvm_alloc_slot(KVMState *s)
  79 {
  80     int i;
  81
  82     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
  83         /* KVM private memory slots */
  84         if (i >= 8 && i < 12)
  85             continue;
  86         if (s->slots[i].memory_size == 0)
  87             return &s->slots[i];
  88     }
  89
  90     fprintf(stderr, "%s: no free slot available\n", __func__);
  91     abort();
  92 }
  93
  94 static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
  95                                          target_phys_addr_t start_addr,
  96                                          target_phys_addr_t end_addr)
  97 {
  98     int i;
  99
 100     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 101         KVMSlot *mem = &s->slots[i];
 102
 103         if (start_addr == mem->start_addr &&
 104             end_addr == mem->start_addr + mem->memory_size) {
 105             return mem;
 106         }
 107     }
 108
 109     return NULL;
 110 }
 111
 112 /*
 113  * Find overlapping slot with lowest start address
 114  */
 115 static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s,
 116                                             target_phys_addr_t start_addr,
 117                                             target_phys_addr_t end_addr)
 118 {
 119     KVMSlot *found = NULL;
 120     int i;
 121
 122     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 123         KVMSlot *mem = &s->slots[i];
 124
 125         if (mem->memory_size == 0 ||
 126             (found && found->start_addr < mem->start_addr)) {
 127             continue;
 128         }
 129
 130         if (end_addr > mem->start_addr &&
 131             start_addr < mem->start_addr + mem->memory_size) {
 132             found = mem;
 133         }
 134     }
 135
 136     return found;
 137 }
 138
 139 static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
 140 {
 141     struct kvm_userspace_memory_region mem;
 142
 143     mem.slot = slot->slot;
 144     mem.guest_phys_addr = slot->start_addr;
 145     mem.memory_size = slot->memory_size;
 146     mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset);
 147     mem.flags = slot->flags;
 148     if (s->migration_log) {
 149         mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;
 150     }
 151     return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
 152 }
 153
 154 static void kvm_reset_vcpu(void *opaque)
 155 {
 156     CPUState *env = opaque;
 157
 158     kvm_arch_reset_vcpu(env);
 159 }
 160
 161 int kvm_irqchip_in_kernel(void)
 162 {
 163     return kvm_state->irqchip_in_kernel;
 164 }
 165
 166 int kvm_pit_in_kernel(void)
 167 {
 168     return kvm_state->pit_in_kernel;
 169 }
 170
 171
 172 int kvm_init_vcpu(CPUState *env)
 173 {
 174     KVMState *s = kvm_state;
 175     long mmap_size;
 176     int ret;
 177
 178     dprintf("kvm_init_vcpu\n");
 179
 180     ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
 181     if (ret < 0) {
 182         dprintf("kvm_create_vcpu failed\n");
 183         goto err;
 184     }
 185
 186     env->kvm_fd = ret;
 187     env->kvm_state = s;
 188
 189     mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
 190     if (mmap_size < 0) {
 191         dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n");
 192         goto err;
 193     }
 194
 195     env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
 196                         env->kvm_fd, 0);
 197     if (env->kvm_run == MAP_FAILED) {
 198         ret = -errno;
 199         dprintf("mmap'ing vcpu state failed\n");
 200         goto err;
 201     }
 202
 203 #ifdef KVM_CAP_COALESCED_MMIO
 204     if (s->coalesced_mmio && !s->coalesced_mmio_ring)
 205         s->coalesced_mmio_ring = (void *) env->kvm_run +
 206                 s->coalesced_mmio * PAGE_SIZE;
 207 #endif
 208
 209     ret = kvm_arch_init_vcpu(env);
 210     if (ret == 0) {
 211         qemu_register_reset(kvm_reset_vcpu, env);
 212         kvm_arch_reset_vcpu(env);
 213     }
 214 err:
 215     return ret;
 216 }
 217
 218 /*
 219  * dirty pages logging control
 220  */
 221 static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr,
 222                                       ram_addr_t size, int flags, int mask)
 223 {
 224     KVMState *s = kvm_state;
 225     KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
 226     int old_flags;
 227
 228     if (mem == NULL)  {
 229             fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
 230                     TARGET_FMT_plx "\n", __func__, phys_addr,
 231                     (target_phys_addr_t)(phys_addr + size - 1));
 232             return -EINVAL;
 233     }
 234
 235     old_flags = mem->flags;
 236
 237     flags = (mem->flags & ~mask) | flags;
 238     mem->flags = flags;
 239
 240     /* If nothing changed effectively, no need to issue ioctl */
 241     if (s->migration_log) {
 242         flags |= KVM_MEM_LOG_DIRTY_PAGES;
 243     }
 244     if (flags == old_flags) {
 245             return 0;
 246     }
 247
 248     return kvm_set_user_memory_region(s, mem);
 249 }
 250
 251 int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
 252 {
 253         return kvm_dirty_pages_log_change(phys_addr, size,
 254                                           KVM_MEM_LOG_DIRTY_PAGES,
 255                                           KVM_MEM_LOG_DIRTY_PAGES);
 256 }
 257
 258 int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
 259 {
 260         return kvm_dirty_pages_log_change(phys_addr, size,
 261                                           0,
 262                                           KVM_MEM_LOG_DIRTY_PAGES);
 263 }
 264
 265 static int kvm_set_migration_log(int enable)
 266 {
 267     KVMState *s = kvm_state;
 268     KVMSlot *mem;
 269     int i, err;
 270
 271     s->migration_log = enable;
 272
 273     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
 274         mem = &s->slots[i];
 275
 276         if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
 277             continue;
 278         }
 279         err = kvm_set_user_memory_region(s, mem);
 280         if (err) {
 281             return err;
 282         }
 283     }
 284     return 0;
 285 }
 286
 287 static int test_le_bit(unsigned long nr, unsigned char *addr)
 288 {
 289     return (addr[nr >> 3] >> (nr & 7)) & 1;
 290 }
 291
 292 /**
 293  * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
 294  * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().
 295  * This means all bits are set to dirty.
 296  *
 297  * @start_add: start of logged region.
 298  * @end_addr: end of logged region.
 299  */
 300 static int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
 301                                           target_phys_addr_t end_addr)
 302 {
 303     KVMState *s = kvm_state;
 304     unsigned long size, allocated_size = 0;
 305     target_phys_addr_t phys_addr;
 306     ram_addr_t addr;
 307     KVMDirtyLog d;
 308     KVMSlot *mem;
 309     int ret = 0;
 310
 311     d.dirty_bitmap = NULL;
 312     while (start_addr < end_addr) {
 313         mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);
 314         if (mem == NULL) {
 315             break;
 316         }
 317
 318         size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8;
 319         if (!d.dirty_bitmap) {
 320             d.dirty_bitmap = qemu_malloc(size);
 321         } else if (size > allocated_size) {
 322             d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size);
 323         }
 324         allocated_size = size;
 325         memset(d.dirty_bitmap, 0, allocated_size);
 326
 327         d.slot = mem->slot;
 328
 329         if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
 330             dprintf("ioctl failed %d\n", errno);
 331             ret = -1;
 332             break;
 333         }
 334
 335         for (phys_addr = mem->start_addr, addr = mem->phys_offset;
 336              phys_addr < mem->start_addr + mem->memory_size;
 337              phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
 338             unsigned char *bitmap = (unsigned char *)d.dirty_bitmap;
 339             unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS;
 340
 341             if (test_le_bit(nr, bitmap)) {
 342                 cpu_physical_memory_set_dirty(addr);
 343             }
 344         }
 345         start_addr = phys_addr;
 346     }
 347     qemu_free(d.dirty_bitmap);
 348
 349     return ret;
 350 }
 351
 352 int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
 353 {
 354     int ret = -ENOSYS;
 355 #ifdef KVM_CAP_COALESCED_MMIO
 356     KVMState *s = kvm_state;
 357
 358     if (s->coalesced_mmio) {
 359         struct kvm_coalesced_mmio_zone zone;
 360
 361         zone.addr = start;
 362         zone.size = size;
 363
 364         ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
 365     }
 366 #endif
 367
 368     return ret;
 369 }
 370
 371 int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
 372 {
 373     int ret = -ENOSYS;
 374 #ifdef KVM_CAP_COALESCED_MMIO
 375     KVMState *s = kvm_state;
 376
 377     if (s->coalesced_mmio) {
 378         struct kvm_coalesced_mmio_zone zone;
 379
 380         zone.addr = start;
 381         zone.size = size;
 382
 383         ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
 384     }
 385 #endif
 386
 387     return ret;
 388 }
 389
 390 int kvm_check_extension(KVMState *s, unsigned int extension)
 391 {
 392     int ret;
 393
 394     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
 395     if (ret < 0) {
 396         ret = 0;
 397     }
 398
 399     return ret;
 400 }
 401
 402 static void kvm_set_phys_mem(target_phys_addr_t start_addr,
 403                              ram_addr_t size,
 404                              ram_addr_t phys_offset)
 405 {
 406     KVMState *s = kvm_state;
 407     ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
 408     KVMSlot *mem, old;
 409     int err;
 410
 411     if (start_addr & ~TARGET_PAGE_MASK) {
 412         if (flags >= IO_MEM_UNASSIGNED) {
 413             if (!kvm_lookup_overlapping_slot(s, start_addr,
 414                                              start_addr + size)) {
 415                 return;
 416             }
 417             fprintf(stderr, "Unaligned split of a KVM memory slot\n");
 418         } else {
 419             fprintf(stderr, "Only page-aligned memory slots supported\n");
 420         }
 421         abort();
 422     }
 423
 424     /* KVM does not support read-only slots */
 425     phys_offset &= ~IO_MEM_ROM;
 426
 427     while (1) {
 428         mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);
 429         if (!mem) {
 430             break;
 431         }
 432
 433         if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
 434             (start_addr + size <= mem->start_addr + mem->memory_size) &&
 435             (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) {
 436             /* The new slot fits into the existing one and comes with
 437              * identical parameters - nothing to be done. */
 438             return;
 439         }
 440
 441         old = *mem;
 442
 443         /* unregister the overlapping slot */
 444         mem->memory_size = 0;
 445         err = kvm_set_user_memory_region(s, mem);
 446         if (err) {
 447             fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
 448                     __func__, strerror(-err));
 449             abort();
 450         }
 451
 452         /* Workaround for older KVM versions: we can't join slots, even not by
 453          * unregistering the previous ones and then registering the larger
 454          * slot. We have to maintain the existing fragmentation. Sigh.
 455          *
 456          * This workaround assumes that the new slot starts at the same
 457          * address as the first existing one. If not or if some overlapping
 458          * slot comes around later, we will fail (not seen in practice so far)
 459          * - and actually require a recent KVM version. */
 460         if (s->broken_set_mem_region &&
 461             old.start_addr == start_addr && old.memory_size < size &&
 462             flags < IO_MEM_UNASSIGNED) {
 463             mem = kvm_alloc_slot(s);
 464             mem->memory_size = old.memory_size;
 465             mem->start_addr = old.start_addr;
 466             mem->phys_offset = old.phys_offset;
 467             mem->flags = 0;
 468
 469             err = kvm_set_user_memory_region(s, mem);
 470             if (err) {
 471                 fprintf(stderr, "%s: error updating slot: %s\n", __func__,
 472                         strerror(-err));
 473                 abort();
 474             }
 475
 476             start_addr += old.memory_size;
 477             phys_offset += old.memory_size;
 478             size -= old.memory_size;
 479             continue;
 480         }
 481
 482         /* register prefix slot */
 483         if (old.start_addr < start_addr) {
 484             mem = kvm_alloc_slot(s);
 485             mem->memory_size = start_addr - old.start_addr;
 486             mem->start_addr = old.start_addr;
 487             mem->phys_offset = old.phys_offset;
 488             mem->flags = 0;
 489
 490             err = kvm_set_user_memory_region(s, mem);
 491             if (err) {
 492                 fprintf(stderr, "%s: error registering prefix slot: %s\n",
 493                         __func__, strerror(-err));
 494                 abort();
 495             }
 496         }
 497
 498         /* register suffix slot */
 499         if (old.start_addr + old.memory_size > start_addr + size) {
 500             ram_addr_t size_delta;
 501
 502             mem = kvm_alloc_slot(s);
 503             mem->start_addr = start_addr + size;
 504             size_delta = mem->start_addr - old.start_addr;
 505             mem->memory_size = old.memory_size - size_delta;
 506             mem->phys_offset = old.phys_offset + size_delta;
 507             mem->flags = 0;
 508
 509             err = kvm_set_user_memory_region(s, mem);
 510             if (err) {
 511                 fprintf(stderr, "%s: error registering suffix slot: %s\n",
 512                         __func__, strerror(-err));
 513                 abort();
 514             }
 515         }
 516     }
 517
 518     /* in case the KVM bug workaround already "consumed" the new slot */
 519     if (!size)
 520         return;
 521
 522     /* KVM does not need to know about this memory */
 523     if (flags >= IO_MEM_UNASSIGNED)
 524         return;
 525
 526     mem = kvm_alloc_slot(s);
 527     mem->memory_size = size;
 528     mem->start_addr = start_addr;
 529     mem->phys_offset = phys_offset;
 530     mem->flags = 0;
 531
 532     err = kvm_set_user_memory_region(s, mem);
 533     if (err) {
 534         fprintf(stderr, "%s: error registering slot: %s\n", __func__,
 535                 strerror(-err));
 536         abort();
 537     }
 538 }
 539
 540 static void kvm_client_set_memory(struct CPUPhysMemoryClient *client,
 541                                   target_phys_addr_t start_addr,
 542                                   ram_addr_t size,
 543                                   ram_addr_t phys_offset)
 544 {
 545         kvm_set_phys_mem(start_addr, size, phys_offset);
 546 }
 547
 548 static int kvm_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client,
 549                                         target_phys_addr_t start_addr,
 550                                         target_phys_addr_t end_addr)
 551 {
 552         return kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
 553 }
 554
 555 static int kvm_client_migration_log(struct CPUPhysMemoryClient *client,
 556                                     int enable)
 557 {
 558         return kvm_set_migration_log(enable);
 559 }
 560
 561 static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {
 562         .set_memory = kvm_client_set_memory,
 563         .sync_dirty_bitmap = kvm_client_sync_dirty_bitmap,
 564         .migration_log = kvm_client_migration_log,
 565 };
 566
 567 int kvm_init(int smp_cpus)
 568 {
 569     static const char upgrade_note[] =
 570         "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
 571         "(see http://sourceforge.net/projects/kvm).\n";
 572     KVMState *s;
 573     int ret;
 574     int i;
 575
 576     if (smp_cpus > 1) {
 577         fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
 578         return -EINVAL;
 579     }
 580
 581     s = qemu_mallocz(sizeof(KVMState));
 582
 583 #ifdef KVM_CAP_SET_GUEST_DEBUG
 584     QTAILQ_INIT(&s->kvm_sw_breakpoints);
 585 #endif
 586     for (i = 0; i < ARRAY_SIZE(s->slots); i++)
 587         s->slots[i].slot = i;
 588
 589     s->vmfd = -1;
 590     s->fd = qemu_open("/dev/kvm", O_RDWR);
 591     if (s->fd == -1) {
 592         fprintf(stderr, "Could not access KVM kernel module: %m\n");
 593         ret = -errno;
 594         goto err;
 595     }
 596
 597     ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
 598     if (ret < KVM_API_VERSION) {
 599         if (ret > 0)
 600             ret = -EINVAL;
 601         fprintf(stderr, "kvm version too old\n");
 602         goto err;
 603     }
 604
 605     if (ret > KVM_API_VERSION) {
 606         ret = -EINVAL;
 607         fprintf(stderr, "kvm version not supported\n");
 608         goto err;
 609     }
 610
 611     s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
 612     if (s->vmfd < 0)
 613         goto err;
 614
 615     /* initially, KVM allocated its own memory and we had to jump through
 616      * hooks to make phys_ram_base point to this.  Modern versions of KVM
 617      * just use a user allocated buffer so we can use regular pages
 618      * unmodified.  Make sure we have a sufficiently modern version of KVM.
 619      */
 620     if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
 621         ret = -EINVAL;
 622         fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
 623                 upgrade_note);
 624         goto err;
 625     }
 626
 627     /* There was a nasty bug in < kvm-80 that prevents memory slots from being
 628      * destroyed properly.  Since we rely on this capability, refuse to work
 629      * with any kernel without this capability. */
 630     if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
 631         ret = -EINVAL;
 632
 633         fprintf(stderr,
 634                 "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
 635                 upgrade_note);
 636         goto err;
 637     }
 638
 639     s->coalesced_mmio = 0;
 640 #ifdef KVM_CAP_COALESCED_MMIO
 641     s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
 642     s->coalesced_mmio_ring = NULL;
 643 #endif
 644
 645     s->broken_set_mem_region = 1;
 646 #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
 647     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
 648     if (ret > 0) {
 649         s->broken_set_mem_region = 0;
 650     }
 651 #endif
 652
 653     s->vcpu_events = 0;
 654 #ifdef KVM_CAP_VCPU_EVENTS
 655     s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
 656 #endif
 657
 658     s->robust_singlestep = 0;
 659 #ifdef KVM_CAP_X86_ROBUST_SINGLESTEP
 660     s->robust_singlestep =
 661         kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
 662 #endif
 663
 664     ret = kvm_arch_init(s, smp_cpus);
 665     if (ret < 0)
 666         goto err;
 667
 668     kvm_state = s;
 669     cpu_register_phys_memory_client(&kvm_cpu_phys_memory_client);
 670
 671     return 0;
 672
 673 err:
 674     if (s) {
 675         if (s->vmfd != -1)
 676             close(s->vmfd);
 677         if (s->fd != -1)
 678             close(s->fd);
 679     }
 680     qemu_free(s);
 681
 682     return ret;
 683 }
 684
 685 static int kvm_handle_io(uint16_t port, void *data, int direction, int size,
 686                          uint32_t count)
 687 {
 688     int i;
 689     uint8_t *ptr = data;
 690
 691     for (i = 0; i < count; i++) {
 692         if (direction == KVM_EXIT_IO_IN) {
 693             switch (size) {
 694             case 1:
 695                 stb_p(ptr, cpu_inb(port));
 696                 break;
 697             case 2:
 698                 stw_p(ptr, cpu_inw(port));
 699                 break;
 700             case 4:
 701                 stl_p(ptr, cpu_inl(port));
 702                 break;
 703             }
 704         } else {
 705             switch (size) {
 706             case 1:
 707                 cpu_outb(port, ldub_p(ptr));
 708                 break;
 709             case 2:
 710                 cpu_outw(port, lduw_p(ptr));
 711                 break;
 712             case 4:
 713                 cpu_outl(port, ldl_p(ptr));
 714                 break;
 715             }
 716         }
 717
 718         ptr += size;
 719     }
 720
 721     return 1;
 722 }
 723
 724 void kvm_flush_coalesced_mmio_buffer(void)
 725 {
 726 #ifdef KVM_CAP_COALESCED_MMIO
 727     KVMState *s = kvm_state;
 728     if (s->coalesced_mmio_ring) {
 729         struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
 730         while (ring->first != ring->last) {
 731             struct kvm_coalesced_mmio *ent;
 732
 733             ent = &ring->coalesced_mmio[ring->first];
 734
 735             cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
 736             smp_wmb();
 737             ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
 738         }
 739     }
 740 #endif
 741 }
 742
 743 void kvm_cpu_synchronize_state(CPUState *env)
 744 {
 745     if (!env->kvm_vcpu_dirty) {
 746         kvm_arch_get_registers(env);
 747         env->kvm_vcpu_dirty = 1;
 748     }
 749 }
 750
 751 void kvm_cpu_synchronize_post_reset(CPUState *env)
 752 {
 753     kvm_arch_put_registers(env, KVM_PUT_RESET_STATE);
 754     env->kvm_vcpu_dirty = 0;
 755 }
 756
 757 void kvm_cpu_synchronize_post_init(CPUState *env)
 758 {
 759     kvm_arch_put_registers(env, KVM_PUT_FULL_STATE);
 760     env->kvm_vcpu_dirty = 0;
 761 }
 762
 763 int kvm_cpu_exec(CPUState *env)
 764 {
 765     struct kvm_run *run = env->kvm_run;
 766     int ret;
 767
 768     dprintf("kvm_cpu_exec()\n");
 769
 770     do {
 771 #ifndef CONFIG_IOTHREAD
 772         if (env->exit_request) {
 773             dprintf("interrupt exit requested\n");
 774             ret = 0;
 775             break;
 776         }
 777 #endif
 778
 779         if (env->kvm_vcpu_dirty) {
 780             kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);
 781             env->kvm_vcpu_dirty = 0;
 782         }
 783
 784         kvm_arch_pre_run(env, run);
 785         qemu_mutex_unlock_iothread();
 786         ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
 787         qemu_mutex_lock_iothread();
 788         kvm_arch_post_run(env, run);
 789
 790         if (ret == -EINTR || ret == -EAGAIN) {
 791             cpu_exit(env);
 792             dprintf("io window exit\n");
 793             ret = 0;
 794             break;
 795         }
 796
 797         if (ret < 0) {
 798             dprintf("kvm run failed %s\n", strerror(-ret));
 799             abort();
 800         }
 801
 802         kvm_flush_coalesced_mmio_buffer();
 803
 804         ret = 0; /* exit loop */
 805         switch (run->exit_reason) {
 806         case KVM_EXIT_IO:
 807             dprintf("handle_io\n");
 808             ret = kvm_handle_io(run->io.port,
 809                                 (uint8_t *)run + run->io.data_offset,
 810                                 run->io.direction,
 811                                 run->io.size,
 812                                 run->io.count);
 813             break;
 814         case KVM_EXIT_MMIO:
 815             dprintf("handle_mmio\n");
 816             cpu_physical_memory_rw(run->mmio.phys_addr,
 817                                    run->mmio.data,
 818                                    run->mmio.len,
 819                                    run->mmio.is_write);
 820             ret = 1;
 821             break;
 822         case KVM_EXIT_IRQ_WINDOW_OPEN:
 823             dprintf("irq_window_open\n");
 824             break;
 825         case KVM_EXIT_SHUTDOWN:
 826             dprintf("shutdown\n");
 827             qemu_system_reset_request();
 828             ret = 1;
 829             break;
 830         case KVM_EXIT_UNKNOWN:
 831             dprintf("kvm_exit_unknown\n");
 832             break;
 833         case KVM_EXIT_FAIL_ENTRY:
 834             dprintf("kvm_exit_fail_entry\n");
 835             break;
 836         case KVM_EXIT_EXCEPTION:
 837             dprintf("kvm_exit_exception\n");
 838             break;
 839         case KVM_EXIT_DEBUG:
 840             dprintf("kvm_exit_debug\n");
 841 #ifdef KVM_CAP_SET_GUEST_DEBUG
 842             if (kvm_arch_debug(&run->debug.arch)) {
 843                 gdb_set_stop_cpu(env);
 844                 vm_stop(EXCP_DEBUG);
 845                 env->exception_index = EXCP_DEBUG;
 846                 return 0;
 847             }
 848             /* re-enter, this exception was guest-internal */
 849             ret = 1;
 850 #endif /* KVM_CAP_SET_GUEST_DEBUG */
 851             break;
 852         default:
 853             dprintf("kvm_arch_handle_exit\n");
 854             ret = kvm_arch_handle_exit(env, run);
 855             break;
 856         }
 857     } while (ret > 0);
 858
 859     if (env->exit_request) {
 860         env->exit_request = 0;
 861         env->exception_index = EXCP_INTERRUPT;
 862     }
 863
 864     return ret;
 865 }
 866
 867 int kvm_ioctl(KVMState *s, int type, ...)
 868 {
 869     int ret;
 870     void *arg;
 871     va_list ap;
 872
 873     va_start(ap, type);
 874     arg = va_arg(ap, void *);
 875     va_end(ap);
 876
 877     ret = ioctl(s->fd, type, arg);
 878     if (ret == -1)
 879         ret = -errno;
 880
 881     return ret;
 882 }
 883
 884 int kvm_vm_ioctl(KVMState *s, int type, ...)
 885 {
 886     int ret;
 887     void *arg;
 888     va_list ap;
 889
 890     va_start(ap, type);
 891     arg = va_arg(ap, void *);
 892     va_end(ap);
 893
 894     ret = ioctl(s->vmfd, type, arg);
 895     if (ret == -1)
 896         ret = -errno;
 897
 898     return ret;
 899 }
 900
 901 int kvm_vcpu_ioctl(CPUState *env, int type, ...)
 902 {
 903     int ret;
 904     void *arg;
 905     va_list ap;
 906
 907     va_start(ap, type);
 908     arg = va_arg(ap, void *);
 909     va_end(ap);
 910
 911     ret = ioctl(env->kvm_fd, type, arg);
 912     if (ret == -1)
 913         ret = -errno;
 914
 915     return ret;
 916 }
 917
 918 int kvm_has_sync_mmu(void)
 919 {
 920 #ifdef KVM_CAP_SYNC_MMU
 921     KVMState *s = kvm_state;
 922
 923     return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
 924 #else
 925     return 0;
 926 #endif
 927 }
 928
 929 int kvm_has_vcpu_events(void)
 930 {
 931     return kvm_state->vcpu_events;
 932 }
 933
 934 int kvm_has_robust_singlestep(void)
 935 {
 936     return kvm_state->robust_singlestep;
 937 }
 938
 939 void kvm_setup_guest_memory(void *start, size_t size)
 940 {
 941     if (!kvm_has_sync_mmu()) {
 942 #ifdef MADV_DONTFORK
 943         int ret = madvise(start, size, MADV_DONTFORK);
 944
 945         if (ret) {
 946             perror("madvice");
 947             exit(1);
 948         }
 949 #else
 950         fprintf(stderr,
 951                 "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
 952         exit(1);
 953 #endif
 954     }
 955 }
 956
 957 #ifdef KVM_CAP_SET_GUEST_DEBUG
 958 static void on_vcpu(CPUState *env, void (*func)(void *data), void *data)
 959 {
 960 #ifdef CONFIG_IOTHREAD
 961     if (env != cpu_single_env) {
 962         abort();
 963     }
 964 #endif
 965     func(data);
 966 }
 967
 968 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
 969                                                  target_ulong pc)
 970 {
 971     struct kvm_sw_breakpoint *bp;
 972
 973     QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) {
 974         if (bp->pc == pc)
 975             return bp;
 976     }
 977     return NULL;
 978 }
 979
 980 int kvm_sw_breakpoints_active(CPUState *env)
 981 {
 982     return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
 983 }
 984
 985 struct kvm_set_guest_debug_data {
 986     struct kvm_guest_debug dbg;
 987     CPUState *env;
 988     int err;
 989 };
 990
 991 static void kvm_invoke_set_guest_debug(void *data)
 992 {
 993     struct kvm_set_guest_debug_data *dbg_data = data;
 994     CPUState *env = dbg_data->env;
 995
 996     dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg);
 997 }
 998
 999 int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
1000 {
1001     struct kvm_set_guest_debug_data data;
1002
1003     data.dbg.control = reinject_trap;
1004
1005     if (env->singlestep_enabled) {
1006         data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
1007     }
1008     kvm_arch_update_guest_debug(env, &data.dbg);
1009     data.env = env;
1010
1011     on_vcpu(env, kvm_invoke_set_guest_debug, &data);
1012     return data.err;
1013 }
1014
1015 int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
1016                           target_ulong len, int type)
1017 {
1018     struct kvm_sw_breakpoint *bp;
1019     CPUState *env;
1020     int err;
1021
1022     if (type == GDB_BREAKPOINT_SW) {
1023         bp = kvm_find_sw_breakpoint(current_env, addr);
1024         if (bp) {
1025             bp->use_count++;
1026             return 0;
1027         }
1028
1029         bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint));
1030         if (!bp)
1031             return -ENOMEM;
1032
1033         bp->pc = addr;
1034         bp->use_count = 1;
1035         err = kvm_arch_insert_sw_breakpoint(current_env, bp);
1036         if (err) {
1037             free(bp);
1038             return err;
1039         }
1040
1041         QTAILQ_INSERT_HEAD(&current_env->kvm_state->kvm_sw_breakpoints,
1042                           bp, entry);
1043     } else {
1044         err = kvm_arch_insert_hw_breakpoint(addr, len, type);
1045         if (err)
1046             return err;
1047     }
1048
1049     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1050         err = kvm_update_guest_debug(env, 0);
1051         if (err)
1052             return err;
1053     }
1054     return 0;
1055 }
1056
1057 int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
1058                           target_ulong len, int type)
1059 {
1060     struct kvm_sw_breakpoint *bp;
1061     CPUState *env;
1062     int err;
1063
1064     if (type == GDB_BREAKPOINT_SW) {
1065         bp = kvm_find_sw_breakpoint(current_env, addr);
1066         if (!bp)
1067             return -ENOENT;
1068
1069         if (bp->use_count > 1) {
1070             bp->use_count--;
1071             return 0;
1072         }
1073
1074         err = kvm_arch_remove_sw_breakpoint(current_env, bp);
1075         if (err)
1076             return err;
1077
1078         QTAILQ_REMOVE(&current_env->kvm_state->kvm_sw_breakpoints, bp, entry);
1079         qemu_free(bp);
1080     } else {
1081         err = kvm_arch_remove_hw_breakpoint(addr, len, type);
1082         if (err)
1083             return err;
1084     }
1085
1086     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1087         err = kvm_update_guest_debug(env, 0);
1088         if (err)
1089             return err;
1090     }
1091     return 0;
1092 }
1093
1094 void kvm_remove_all_breakpoints(CPUState *current_env)
1095 {
1096     struct kvm_sw_breakpoint *bp, *next;
1097     KVMState *s = current_env->kvm_state;
1098     CPUState *env;
1099
1100     QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
1101         if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) {
1102             /* Try harder to find a CPU that currently sees the breakpoint. */
1103             for (env = first_cpu; env != NULL; env = env->next_cpu) {
1104                 if (kvm_arch_remove_sw_breakpoint(env, bp) == 0)
1105                     break;
1106             }
1107         }
1108     }
1109     kvm_arch_remove_all_hw_breakpoints();
1110
1111     for (env = first_cpu; env != NULL; env = env->next_cpu)
1112         kvm_update_guest_debug(env, 0);
1113 }
1114
1115 #else /* !KVM_CAP_SET_GUEST_DEBUG */
1116
1117 int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
1118 {
1119     return -EINVAL;
1120 }
1121
1122 int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
1123                           target_ulong len, int type)
1124 {
1125     return -EINVAL;
1126 }
1127
1128 int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
1129                           target_ulong len, int type)
1130 {
1131     return -EINVAL;
1132 }
1133
1134 void kvm_remove_all_breakpoints(CPUState *current_env)
1135 {
1136 }
1137 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
1138
1139 int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset)
1140 {
1141     struct kvm_signal_mask *sigmask;
1142     int r;
1143
1144     if (!sigset)
1145         return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL);
1146
1147     sigmask = qemu_malloc(sizeof(*sigmask) + sizeof(*sigset));
1148
1149     sigmask->len = 8;
1150     memcpy(sigmask->sigset, sigset, sizeof(*sigset));
1151     r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask);
1152     free(sigmask);
1153
1154     return r;
1155 }