system/qtest.c

   1 /*
   2  * Test Server
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "qapi/error.h"
  16 #include "sysemu/qtest.h"
  17 #include "sysemu/runstate.h"
  18 #include "chardev/char-fe.h"
  19 #include "exec/ioport.h"
  20 #include "exec/memory.h"
  21 #include "exec/tswap.h"
  22 #include "hw/qdev-core.h"
  23 #include "hw/irq.h"
  24 #include "qemu/accel.h"
  25 #include "sysemu/cpu-timers.h"
  26 #include "qemu/config-file.h"
  27 #include "qemu/option.h"
  28 #include "qemu/error-report.h"
  29 #include "qemu/module.h"
  30 #include "qemu/cutils.h"
  31 #include "qom/object_interfaces.h"
  32
  33 #define MAX_IRQ 256
  34
  35 #define TYPE_QTEST "qtest"
  36
  37 OBJECT_DECLARE_SIMPLE_TYPE(QTest, QTEST)
  38
  39 struct QTest {
  40     Object parent;
  41
  42     bool has_machine_link;
  43     char *chr_name;
  44     Chardev *chr;
  45     CharBackend qtest_chr;
  46     char *log;
  47 };
  48
  49 bool qtest_allowed;
  50
  51 static DeviceState *irq_intercept_dev;
  52 static FILE *qtest_log_fp;
  53 static QTest *qtest;
  54 static GString *inbuf;
  55 static int irq_levels[MAX_IRQ];
  56 static GTimer *timer;
  57 static bool qtest_opened;
  58 static void (*qtest_server_send)(void*, const char*);
  59 static void *qtest_server_send_opaque;
  60
  61 #define FMT_timeval "%.06f"
  62
  63 /**
  64  * DOC: QTest Protocol
  65  *
  66  * Line based protocol, request/response based.  Server can send async messages
  67  * so clients should always handle many async messages before the response
  68  * comes in.
  69  *
  70  * Valid requests
  71  * ^^^^^^^^^^^^^^
  72  *
  73  * Clock management:
  74  * """""""""""""""""
  75  *
  76  * The qtest client is completely in charge of the QEMU_CLOCK_VIRTUAL.  qtest commands
  77  * let you adjust the value of the clock (monotonically).  All the commands
  78  * return the current value of the clock in nanoseconds.
  79  *
  80  * .. code-block:: none
  81  *
  82  *  > clock_step
  83  *  < OK VALUE
  84  *
  85  * Advance the clock to the next deadline.  Useful when waiting for
  86  * asynchronous events.
  87  *
  88  * .. code-block:: none
  89  *
  90  *  > clock_step NS
  91  *  < OK VALUE
  92  *
  93  * Advance the clock by NS nanoseconds.
  94  *
  95  * .. code-block:: none
  96  *
  97  *  > clock_set NS
  98  *  < OK VALUE
  99  *
 100  * Advance the clock to NS nanoseconds (do nothing if it's already past).
 101  *
 102  * PIO and memory access:
 103  * """"""""""""""""""""""
 104  *
 105  * .. code-block:: none
 106  *
 107  *  > outb ADDR VALUE
 108  *  < OK
 109  *
 110  * .. code-block:: none
 111  *
 112  *  > outw ADDR VALUE
 113  *  < OK
 114  *
 115  * .. code-block:: none
 116  *
 117  *  > outl ADDR VALUE
 118  *  < OK
 119  *
 120  * .. code-block:: none
 121  *
 122  *  > inb ADDR
 123  *  < OK VALUE
 124  *
 125  * .. code-block:: none
 126  *
 127  *  > inw ADDR
 128  *  < OK VALUE
 129  *
 130  * .. code-block:: none
 131  *
 132  *  > inl ADDR
 133  *  < OK VALUE
 134  *
 135  * .. code-block:: none
 136  *
 137  *  > writeb ADDR VALUE
 138  *  < OK
 139  *
 140  * .. code-block:: none
 141  *
 142  *  > writew ADDR VALUE
 143  *  < OK
 144  *
 145  * .. code-block:: none
 146  *
 147  *  > writel ADDR VALUE
 148  *  < OK
 149  *
 150  * .. code-block:: none
 151  *
 152  *  > writeq ADDR VALUE
 153  *  < OK
 154  *
 155  * .. code-block:: none
 156  *
 157  *  > readb ADDR
 158  *  < OK VALUE
 159  *
 160  * .. code-block:: none
 161  *
 162  *  > readw ADDR
 163  *  < OK VALUE
 164  *
 165  * .. code-block:: none
 166  *
 167  *  > readl ADDR
 168  *  < OK VALUE
 169  *
 170  * .. code-block:: none
 171  *
 172  *  > readq ADDR
 173  *  < OK VALUE
 174  *
 175  * .. code-block:: none
 176  *
 177  *  > read ADDR SIZE
 178  *  < OK DATA
 179  *
 180  * .. code-block:: none
 181  *
 182  *  > write ADDR SIZE DATA
 183  *  < OK
 184  *
 185  * .. code-block:: none
 186  *
 187  *  > b64read ADDR SIZE
 188  *  < OK B64_DATA
 189  *
 190  * .. code-block:: none
 191  *
 192  *  > b64write ADDR SIZE B64_DATA
 193  *  < OK
 194  *
 195  * .. code-block:: none
 196  *
 197  *  > memset ADDR SIZE VALUE
 198  *  < OK
 199  *
 200  * ADDR, SIZE, VALUE are all integers parsed with strtoul() with a base of 0.
 201  * For 'memset' a zero size is permitted and does nothing.
 202  *
 203  * DATA is an arbitrarily long hex number prefixed with '0x'.  If it's smaller
 204  * than the expected size, the value will be zero filled at the end of the data
 205  * sequence.
 206  *
 207  * B64_DATA is an arbitrarily long base64 encoded string.
 208  * If the sizes do not match, the data will be truncated.
 209  *
 210  * IRQ management:
 211  * """""""""""""""
 212  *
 213  * .. code-block:: none
 214  *
 215  *  > irq_intercept_in QOM-PATH
 216  *  < OK
 217  *
 218  * .. code-block:: none
 219  *
 220  *  > irq_intercept_out QOM-PATH
 221  *  < OK
 222  *
 223  * Attach to the gpio-in (resp. gpio-out) pins exported by the device at
 224  * QOM-PATH.  When the pin is triggered, one of the following async messages
 225  * will be printed to the qtest stream::
 226  *
 227  *  IRQ raise NUM
 228  *  IRQ lower NUM
 229  *
 230  * where NUM is an IRQ number.  For the PC, interrupts can be intercepted
 231  * simply with "irq_intercept_in ioapic" (note that IRQ0 comes out with
 232  * NUM=0 even though it is remapped to GSI 2).
 233  *
 234  * Setting interrupt level:
 235  * """"""""""""""""""""""""
 236  *
 237  * .. code-block:: none
 238  *
 239  *  > set_irq_in QOM-PATH NAME NUM LEVEL
 240  *  < OK
 241  *
 242  * where NAME is the name of the irq/gpio list, NUM is an IRQ number and
 243  * LEVEL is an signed integer IRQ level.
 244  *
 245  * Forcibly set the given interrupt pin to the given level.
 246  *
 247  */
 248
 249 static int hex2nib(char ch)
 250 {
 251     if (ch >= '0' && ch <= '9') {
 252         return ch - '0';
 253     } else if (ch >= 'a' && ch <= 'f') {
 254         return 10 + (ch - 'a');
 255     } else if (ch >= 'A' && ch <= 'F') {
 256         return 10 + (ch - 'A');
 257     } else {
 258         return -1;
 259     }
 260 }
 261
 262 void qtest_send_prefix(CharBackend *chr)
 263 {
 264     if (!qtest_log_fp || !qtest_opened) {
 265         return;
 266     }
 267
 268     fprintf(qtest_log_fp, "[S +" FMT_timeval "] ", g_timer_elapsed(timer, NULL));
 269 }
 270
 271 static void G_GNUC_PRINTF(1, 2) qtest_log_send(const char *fmt, ...)
 272 {
 273     va_list ap;
 274
 275     if (!qtest_log_fp || !qtest_opened) {
 276         return;
 277     }
 278
 279     qtest_send_prefix(NULL);
 280
 281     va_start(ap, fmt);
 282     vfprintf(qtest_log_fp, fmt, ap);
 283     va_end(ap);
 284 }
 285
 286 static void qtest_server_char_be_send(void *opaque, const char *str)
 287 {
 288     size_t len = strlen(str);
 289     CharBackend* chr = (CharBackend *)opaque;
 290     qemu_chr_fe_write_all(chr, (uint8_t *)str, len);
 291     if (qtest_log_fp && qtest_opened) {
 292         fprintf(qtest_log_fp, "%s", str);
 293     }
 294 }
 295
 296 static void qtest_send(CharBackend *chr, const char *str)
 297 {
 298     qtest_server_send(qtest_server_send_opaque, str);
 299 }
 300
 301 void qtest_sendf(CharBackend *chr, const char *fmt, ...)
 302 {
 303     va_list ap;
 304     gchar *buffer;
 305
 306     va_start(ap, fmt);
 307     buffer = g_strdup_vprintf(fmt, ap);
 308     qtest_send(chr, buffer);
 309     g_free(buffer);
 310     va_end(ap);
 311 }
 312
 313 static void qtest_irq_handler(void *opaque, int n, int level)
 314 {
 315     qemu_irq old_irq = *(qemu_irq *)opaque;
 316     qemu_set_irq(old_irq, level);
 317
 318     if (irq_levels[n] != level) {
 319         CharBackend *chr = &qtest->qtest_chr;
 320         irq_levels[n] = level;
 321         qtest_send_prefix(chr);
 322         qtest_sendf(chr, "IRQ %s %d\n",
 323                     level ? "raise" : "lower", n);
 324     }
 325 }
 326
 327 static int64_t qtest_clock_counter;
 328
 329 int64_t qtest_get_virtual_clock(void)
 330 {
 331     return qatomic_read_i64(&qtest_clock_counter);
 332 }
 333
 334 static void qtest_set_virtual_clock(int64_t count)
 335 {
 336     qatomic_set_i64(&qtest_clock_counter, count);
 337 }
 338
 339 static void qtest_clock_warp(int64_t dest)
 340 {
 341     int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 342     AioContext *aio_context;
 343     assert(qtest_enabled());
 344     aio_context = qemu_get_aio_context();
 345     while (clock < dest) {
 346         int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
 347                                                       QEMU_TIMER_ATTR_ALL);
 348         int64_t warp = qemu_soonest_timeout(dest - clock, deadline);
 349
 350         qtest_set_virtual_clock(qtest_get_virtual_clock() + warp);
 351
 352         qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
 353         timerlist_run_timers(aio_context->tlg.tl[QEMU_CLOCK_VIRTUAL]);
 354         clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 355     }
 356     qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
 357 }
 358
 359 static bool (*process_command_cb)(CharBackend *chr, gchar **words);
 360
 361 void qtest_set_command_cb(bool (*pc_cb)(CharBackend *chr, gchar **words))
 362 {
 363     assert(!process_command_cb);  /* Switch to a list if we need more than one */
 364
 365     process_command_cb = pc_cb;
 366 }
 367
 368 static void qtest_install_gpio_out_intercept(DeviceState *dev, const char *name, int n)
 369 {
 370     qemu_irq *disconnected = g_new0(qemu_irq, 1);
 371     qemu_irq icpt = qemu_allocate_irq(qtest_irq_handler,
 372                                       disconnected, n);
 373
 374     *disconnected = qdev_intercept_gpio_out(dev, icpt, name, n);
 375 }
 376
 377 static void qtest_process_command(CharBackend *chr, gchar **words)
 378 {
 379     const gchar *command;
 380
 381     g_assert(words);
 382
 383     command = words[0];
 384
 385     if (qtest_log_fp) {
 386         int i;
 387
 388         fprintf(qtest_log_fp, "[R +" FMT_timeval "]", g_timer_elapsed(timer, NULL));
 389         for (i = 0; words[i]; i++) {
 390             fprintf(qtest_log_fp, " %s", words[i]);
 391         }
 392         fprintf(qtest_log_fp, "\n");
 393     }
 394
 395     g_assert(command);
 396     if (strcmp(words[0], "irq_intercept_out") == 0
 397         || strcmp(words[0], "irq_intercept_in") == 0) {
 398         DeviceState *dev;
 399         NamedGPIOList *ngl;
 400         bool is_named;
 401         bool is_outbound;
 402         bool interception_succeeded = false;
 403
 404         g_assert(words[1]);
 405         is_named = words[2] != NULL;
 406         is_outbound = words[0][14] == 'o';
 407         dev = DEVICE(object_resolve_path(words[1], NULL));
 408         if (!dev) {
 409             qtest_send_prefix(chr);
 410             qtest_send(chr, "FAIL Unknown device\n");
 411             return;
 412         }
 413
 414         if (is_named && !is_outbound) {
 415             qtest_send_prefix(chr);
 416             qtest_send(chr, "FAIL Interception of named in-GPIOs not yet supported\n");
 417             return;
 418         }
 419
 420         if (irq_intercept_dev) {
 421             qtest_send_prefix(chr);
 422             if (irq_intercept_dev != dev) {
 423                 qtest_send(chr, "FAIL IRQ intercept already enabled\n");
 424             } else {
 425                 qtest_send(chr, "OK\n");
 426             }
 427             return;
 428         }
 429
 430         QLIST_FOREACH(ngl, &dev->gpios, node) {
 431             /* We don't support inbound interception of named GPIOs yet */
 432             if (is_outbound) {
 433                 /* NULL is valid and matchable, for "unnamed GPIO" */
 434                 if (g_strcmp0(ngl->name, words[2]) == 0) {
 435                     int i;
 436                     for (i = 0; i < ngl->num_out; ++i) {
 437                         qtest_install_gpio_out_intercept(dev, ngl->name, i);
 438                     }
 439                     interception_succeeded = true;
 440                 }
 441             } else {
 442                 qemu_irq_intercept_in(ngl->in, qtest_irq_handler,
 443                                       ngl->num_in);
 444                 interception_succeeded = true;
 445             }
 446         }
 447
 448         qtest_send_prefix(chr);
 449         if (interception_succeeded) {
 450             irq_intercept_dev = dev;
 451             qtest_send(chr, "OK\n");
 452         } else {
 453             qtest_send(chr, "FAIL No intercepts installed\n");
 454         }
 455     } else if (strcmp(words[0], "set_irq_in") == 0) {
 456         DeviceState *dev;
 457         qemu_irq irq;
 458         char *name;
 459         int ret;
 460         int num;
 461         int level;
 462
 463         g_assert(words[1] && words[2] && words[3] && words[4]);
 464
 465         dev = DEVICE(object_resolve_path(words[1], NULL));
 466         if (!dev) {
 467             qtest_send_prefix(chr);
 468             qtest_send(chr, "FAIL Unknown device\n");
 469             return;
 470         }
 471
 472         if (strcmp(words[2], "unnamed-gpio-in") == 0) {
 473             name = NULL;
 474         } else {
 475             name = words[2];
 476         }
 477
 478         ret = qemu_strtoi(words[3], NULL, 0, &num);
 479         g_assert(!ret);
 480         ret = qemu_strtoi(words[4], NULL, 0, &level);
 481         g_assert(!ret);
 482
 483         irq = qdev_get_gpio_in_named(dev, name, num);
 484
 485         qemu_set_irq(irq, level);
 486         qtest_send_prefix(chr);
 487         qtest_send(chr, "OK\n");
 488     } else if (strcmp(words[0], "outb") == 0 ||
 489                strcmp(words[0], "outw") == 0 ||
 490                strcmp(words[0], "outl") == 0) {
 491         unsigned long addr;
 492         unsigned long value;
 493         int ret;
 494
 495         g_assert(words[1] && words[2]);
 496         ret = qemu_strtoul(words[1], NULL, 0, &addr);
 497         g_assert(ret == 0);
 498         ret = qemu_strtoul(words[2], NULL, 0, &value);
 499         g_assert(ret == 0);
 500         g_assert(addr <= 0xffff);
 501
 502         if (words[0][3] == 'b') {
 503             cpu_outb(addr, value);
 504         } else if (words[0][3] == 'w') {
 505             cpu_outw(addr, value);
 506         } else if (words[0][3] == 'l') {
 507             cpu_outl(addr, value);
 508         }
 509         qtest_send_prefix(chr);
 510         qtest_send(chr, "OK\n");
 511     } else if (strcmp(words[0], "inb") == 0 ||
 512         strcmp(words[0], "inw") == 0 ||
 513         strcmp(words[0], "inl") == 0) {
 514         unsigned long addr;
 515         uint32_t value = -1U;
 516         int ret;
 517
 518         g_assert(words[1]);
 519         ret = qemu_strtoul(words[1], NULL, 0, &addr);
 520         g_assert(ret == 0);
 521         g_assert(addr <= 0xffff);
 522
 523         if (words[0][2] == 'b') {
 524             value = cpu_inb(addr);
 525         } else if (words[0][2] == 'w') {
 526             value = cpu_inw(addr);
 527         } else if (words[0][2] == 'l') {
 528             value = cpu_inl(addr);
 529         }
 530         qtest_send_prefix(chr);
 531         qtest_sendf(chr, "OK 0x%04x\n", value);
 532     } else if (strcmp(words[0], "writeb") == 0 ||
 533                strcmp(words[0], "writew") == 0 ||
 534                strcmp(words[0], "writel") == 0 ||
 535                strcmp(words[0], "writeq") == 0) {
 536         uint64_t addr;
 537         uint64_t value;
 538         int ret;
 539
 540         g_assert(words[1] && words[2]);
 541         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 542         g_assert(ret == 0);
 543         ret = qemu_strtou64(words[2], NULL, 0, &value);
 544         g_assert(ret == 0);
 545
 546         if (words[0][5] == 'b') {
 547             uint8_t data = value;
 548             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 549                                 &data, 1);
 550         } else if (words[0][5] == 'w') {
 551             uint16_t data = value;
 552             tswap16s(&data);
 553             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 554                                 &data, 2);
 555         } else if (words[0][5] == 'l') {
 556             uint32_t data = value;
 557             tswap32s(&data);
 558             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 559                                 &data, 4);
 560         } else if (words[0][5] == 'q') {
 561             uint64_t data = value;
 562             tswap64s(&data);
 563             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 564                                 &data, 8);
 565         }
 566         qtest_send_prefix(chr);
 567         qtest_send(chr, "OK\n");
 568     } else if (strcmp(words[0], "readb") == 0 ||
 569                strcmp(words[0], "readw") == 0 ||
 570                strcmp(words[0], "readl") == 0 ||
 571                strcmp(words[0], "readq") == 0) {
 572         uint64_t addr;
 573         uint64_t value = UINT64_C(-1);
 574         int ret;
 575
 576         g_assert(words[1]);
 577         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 578         g_assert(ret == 0);
 579
 580         if (words[0][4] == 'b') {
 581             uint8_t data;
 582             address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 583                                &data, 1);
 584             value = data;
 585         } else if (words[0][4] == 'w') {
 586             uint16_t data;
 587             address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 588                                &data, 2);
 589             value = tswap16(data);
 590         } else if (words[0][4] == 'l') {
 591             uint32_t data;
 592             address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 593                                &data, 4);
 594             value = tswap32(data);
 595         } else if (words[0][4] == 'q') {
 596             address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 597                                &value, 8);
 598             tswap64s(&value);
 599         }
 600         qtest_send_prefix(chr);
 601         qtest_sendf(chr, "OK 0x%016" PRIx64 "\n", value);
 602     } else if (strcmp(words[0], "read") == 0) {
 603         uint64_t addr, len, i;
 604         uint8_t *data;
 605         char *enc;
 606         int ret;
 607
 608         g_assert(words[1] && words[2]);
 609         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 610         g_assert(ret == 0);
 611         ret = qemu_strtou64(words[2], NULL, 0, &len);
 612         g_assert(ret == 0);
 613         /* We'd send garbage to libqtest if len is 0 */
 614         g_assert(len);
 615
 616         data = g_malloc(len);
 617         address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
 618                            len);
 619
 620         enc = g_malloc(2 * len + 1);
 621         for (i = 0; i < len; i++) {
 622             sprintf(&enc[i * 2], "%02x", data[i]);
 623         }
 624
 625         qtest_send_prefix(chr);
 626         qtest_sendf(chr, "OK 0x%s\n", enc);
 627
 628         g_free(data);
 629         g_free(enc);
 630     } else if (strcmp(words[0], "b64read") == 0) {
 631         uint64_t addr, len;
 632         uint8_t *data;
 633         gchar *b64_data;
 634         int ret;
 635
 636         g_assert(words[1] && words[2]);
 637         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 638         g_assert(ret == 0);
 639         ret = qemu_strtou64(words[2], NULL, 0, &len);
 640         g_assert(ret == 0);
 641
 642         data = g_malloc(len);
 643         address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
 644                            len);
 645         b64_data = g_base64_encode(data, len);
 646         qtest_send_prefix(chr);
 647         qtest_sendf(chr, "OK %s\n", b64_data);
 648
 649         g_free(data);
 650         g_free(b64_data);
 651     } else if (strcmp(words[0], "write") == 0) {
 652         uint64_t addr, len, i;
 653         uint8_t *data;
 654         size_t data_len;
 655         int ret;
 656
 657         g_assert(words[1] && words[2] && words[3]);
 658         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 659         g_assert(ret == 0);
 660         ret = qemu_strtou64(words[2], NULL, 0, &len);
 661         g_assert(ret == 0);
 662
 663         data_len = strlen(words[3]);
 664         if (data_len < 3) {
 665             qtest_send(chr, "ERR invalid argument size\n");
 666             return;
 667         }
 668
 669         data = g_malloc(len);
 670         for (i = 0; i < len; i++) {
 671             if ((i * 2 + 4) <= data_len) {
 672                 data[i] = hex2nib(words[3][i * 2 + 2]) << 4;
 673                 data[i] |= hex2nib(words[3][i * 2 + 3]);
 674             } else {
 675                 data[i] = 0;
 676             }
 677         }
 678         address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
 679                             len);
 680         g_free(data);
 681
 682         qtest_send_prefix(chr);
 683         qtest_send(chr, "OK\n");
 684     } else if (strcmp(words[0], "memset") == 0) {
 685         uint64_t addr, len;
 686         uint8_t *data;
 687         unsigned long pattern;
 688         int ret;
 689
 690         g_assert(words[1] && words[2] && words[3]);
 691         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 692         g_assert(ret == 0);
 693         ret = qemu_strtou64(words[2], NULL, 0, &len);
 694         g_assert(ret == 0);
 695         ret = qemu_strtoul(words[3], NULL, 0, &pattern);
 696         g_assert(ret == 0);
 697
 698         if (len) {
 699             data = g_malloc(len);
 700             memset(data, pattern, len);
 701             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 702                                 data, len);
 703             g_free(data);
 704         }
 705
 706         qtest_send_prefix(chr);
 707         qtest_send(chr, "OK\n");
 708     }  else if (strcmp(words[0], "b64write") == 0) {
 709         uint64_t addr, len;
 710         uint8_t *data;
 711         size_t data_len;
 712         gsize out_len;
 713         int ret;
 714
 715         g_assert(words[1] && words[2] && words[3]);
 716         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 717         g_assert(ret == 0);
 718         ret = qemu_strtou64(words[2], NULL, 0, &len);
 719         g_assert(ret == 0);
 720
 721         data_len = strlen(words[3]);
 722         if (data_len < 3) {
 723             qtest_send(chr, "ERR invalid argument size\n");
 724             return;
 725         }
 726
 727         data = g_base64_decode_inplace(words[3], &out_len);
 728         if (out_len != len) {
 729             qtest_log_send("b64write: data length mismatch (told %"PRIu64", "
 730                            "found %zu)\n",
 731                            len, out_len);
 732             out_len = MIN(out_len, len);
 733         }
 734
 735         address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
 736                             len);
 737
 738         qtest_send_prefix(chr);
 739         qtest_send(chr, "OK\n");
 740     } else if (strcmp(words[0], "endianness") == 0) {
 741         qtest_send_prefix(chr);
 742         if (target_words_bigendian()) {
 743             qtest_sendf(chr, "OK big\n");
 744         } else {
 745             qtest_sendf(chr, "OK little\n");
 746         }
 747     } else if (qtest_enabled() && strcmp(words[0], "clock_step") == 0) {
 748         int64_t ns;
 749
 750         if (words[1]) {
 751             int ret = qemu_strtoi64(words[1], NULL, 0, &ns);
 752             g_assert(ret == 0);
 753         } else {
 754             ns = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
 755                                             QEMU_TIMER_ATTR_ALL);
 756         }
 757         qtest_clock_warp(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + ns);
 758         qtest_send_prefix(chr);
 759         qtest_sendf(chr, "OK %"PRIi64"\n",
 760                     (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 761     } else if (strcmp(words[0], "module_load") == 0) {
 762         Error *local_err = NULL;
 763         int rv;
 764         g_assert(words[1] && words[2]);
 765
 766         qtest_send_prefix(chr);
 767         rv = module_load(words[1], words[2], &local_err);
 768         if (rv > 0) {
 769             qtest_sendf(chr, "OK\n");
 770         } else {
 771             if (rv < 0) {
 772                 error_report_err(local_err);
 773             }
 774             qtest_sendf(chr, "FAIL\n");
 775         }
 776     } else if (qtest_enabled() && strcmp(words[0], "clock_set") == 0) {
 777         int64_t ns;
 778         int ret;
 779
 780         g_assert(words[1]);
 781         ret = qemu_strtoi64(words[1], NULL, 0, &ns);
 782         g_assert(ret == 0);
 783         qtest_clock_warp(ns);
 784         qtest_send_prefix(chr);
 785         qtest_sendf(chr, "OK %"PRIi64"\n",
 786                     (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 787     } else if (process_command_cb && process_command_cb(chr, words)) {
 788         /* Command got consumed by the callback handler */
 789     } else {
 790         qtest_send_prefix(chr);
 791         qtest_sendf(chr, "FAIL Unknown command '%s'\n", words[0]);
 792     }
 793 }
 794
 795 static void qtest_process_inbuf(CharBackend *chr, GString *inbuf)
 796 {
 797     char *end;
 798
 799     while ((end = strchr(inbuf->str, '\n')) != NULL) {
 800         size_t offset;
 801         GString *cmd;
 802         gchar **words;
 803
 804         offset = end - inbuf->str;
 805
 806         cmd = g_string_new_len(inbuf->str, offset);
 807         g_string_erase(inbuf, 0, offset + 1);
 808
 809         words = g_strsplit(cmd->str, " ", 0);
 810         qtest_process_command(chr, words);
 811         g_strfreev(words);
 812
 813         g_string_free(cmd, TRUE);
 814     }
 815 }
 816
 817 static void qtest_read(void *opaque, const uint8_t *buf, int size)
 818 {
 819     CharBackend *chr = opaque;
 820
 821     g_string_append_len(inbuf, (const gchar *)buf, size);
 822     qtest_process_inbuf(chr, inbuf);
 823 }
 824
 825 static int qtest_can_read(void *opaque)
 826 {
 827     return 1024;
 828 }
 829
 830 static void qtest_event(void *opaque, QEMUChrEvent event)
 831 {
 832     int i;
 833
 834     switch (event) {
 835     case CHR_EVENT_OPENED:
 836         /*
 837          * We used to call qemu_system_reset() here, hoping we could
 838          * use the same process for multiple tests that way.  Never
 839          * used.  Injects an extra reset even when it's not used, and
 840          * that can mess up tests, e.g. -boot once.
 841          */
 842         for (i = 0; i < ARRAY_SIZE(irq_levels); i++) {
 843             irq_levels[i] = 0;
 844         }
 845
 846         g_clear_pointer(&timer, g_timer_destroy);
 847         timer = g_timer_new();
 848         qtest_opened = true;
 849         if (qtest_log_fp) {
 850             fprintf(qtest_log_fp, "[I " FMT_timeval "] OPENED\n", g_timer_elapsed(timer, NULL));
 851         }
 852         break;
 853     case CHR_EVENT_CLOSED:
 854         qtest_opened = false;
 855         if (qtest_log_fp) {
 856             fprintf(qtest_log_fp, "[I +" FMT_timeval "] CLOSED\n", g_timer_elapsed(timer, NULL));
 857         }
 858         g_clear_pointer(&timer, g_timer_destroy);
 859         break;
 860     default:
 861         break;
 862     }
 863 }
 864
 865 void qtest_server_init(const char *qtest_chrdev, const char *qtest_log, Error **errp)
 866 {
 867     ERRP_GUARD();
 868     Chardev *chr;
 869     Object *qobj;
 870
 871     chr = qemu_chr_new("qtest", qtest_chrdev, NULL);
 872     if (chr == NULL) {
 873         error_setg(errp, "Failed to initialize device for qtest: \"%s\"",
 874                    qtest_chrdev);
 875         return;
 876     }
 877
 878     qobj = object_new(TYPE_QTEST);
 879     object_property_set_str(qobj, "chardev", chr->label, &error_abort);
 880     if (qtest_log) {
 881         object_property_set_str(qobj, "log", qtest_log, &error_abort);
 882     }
 883     object_property_add_child(qdev_get_machine(), "qtest", qobj);
 884     user_creatable_complete(USER_CREATABLE(qobj), errp);
 885     if (*errp) {
 886         object_unparent(qobj);
 887     }
 888     object_unref(OBJECT(chr));
 889     object_unref(qobj);
 890 }
 891
 892 static bool qtest_server_start(QTest *q, Error **errp)
 893 {
 894     Chardev *chr = q->chr;
 895     const char *qtest_log = q->log;
 896
 897     if (qtest_log) {
 898         if (strcmp(qtest_log, "none") != 0) {
 899             qtest_log_fp = fopen(qtest_log, "w+");
 900         }
 901     } else {
 902         qtest_log_fp = stderr;
 903     }
 904
 905     if (!qemu_chr_fe_init(&q->qtest_chr, chr, errp)) {
 906         return false;
 907     }
 908     qemu_chr_fe_set_handlers(&q->qtest_chr, qtest_can_read, qtest_read,
 909                              qtest_event, NULL, &q->qtest_chr, NULL, true);
 910     qemu_chr_fe_set_echo(&q->qtest_chr, true);
 911
 912     inbuf = g_string_new("");
 913
 914     if (!qtest_server_send) {
 915         qtest_server_set_send_handler(qtest_server_char_be_send, &q->qtest_chr);
 916     }
 917     qtest = q;
 918     return true;
 919 }
 920
 921 void qtest_server_set_send_handler(void (*send)(void*, const char*),
 922                                    void *opaque)
 923 {
 924     qtest_server_send = send;
 925     qtest_server_send_opaque = opaque;
 926 }
 927
 928 bool qtest_driver(void)
 929 {
 930     return qtest && qtest->qtest_chr.chr != NULL;
 931 }
 932
 933 void qtest_server_inproc_recv(void *dummy, const char *buf)
 934 {
 935     static GString *gstr;
 936     if (!gstr) {
 937         gstr = g_string_new(NULL);
 938     }
 939     g_string_append(gstr, buf);
 940     if (gstr->str[gstr->len - 1] == '\n') {
 941         qtest_process_inbuf(NULL, gstr);
 942         g_string_truncate(gstr, 0);
 943     }
 944 }
 945
 946 static void qtest_complete(UserCreatable *uc, Error **errp)
 947 {
 948     QTest *q = QTEST(uc);
 949     if (qtest) {
 950         error_setg(errp, "Only one instance of qtest can be created");
 951         return;
 952     }
 953     if (!q->chr_name) {
 954         error_setg(errp, "No backend specified");
 955         return;
 956     }
 957
 958     if (OBJECT(uc)->parent != qdev_get_machine()) {
 959         q->has_machine_link = true;
 960         object_property_add_const_link(qdev_get_machine(), "qtest", OBJECT(uc));
 961     } else {
 962         /* -qtest was used.  */
 963     }
 964
 965     qtest_server_start(q, errp);
 966 }
 967
 968 static void qtest_unparent(Object *obj)
 969 {
 970     QTest *q = QTEST(obj);
 971
 972     if (qtest == q) {
 973         qemu_chr_fe_disconnect(&q->qtest_chr);
 974         assert(!qtest_opened);
 975         qemu_chr_fe_deinit(&q->qtest_chr, false);
 976         if (qtest_log_fp) {
 977             fclose(qtest_log_fp);
 978             qtest_log_fp = NULL;
 979         }
 980         qtest = NULL;
 981     }
 982
 983     if (q->has_machine_link) {
 984         object_property_del(qdev_get_machine(), "qtest");
 985         q->has_machine_link = false;
 986     }
 987 }
 988
 989 static void qtest_set_log(Object *obj, const char *value, Error **errp)
 990 {
 991     QTest *q = QTEST(obj);
 992
 993     if (qtest == q) {
 994         error_setg(errp, "Property 'log' can not be set now");
 995     } else {
 996         g_free(q->log);
 997         q->log = g_strdup(value);
 998     }
 999 }
1000
1001 static char *qtest_get_log(Object *obj, Error **errp)
1002 {
1003     QTest *q = QTEST(obj);
1004
1005     return g_strdup(q->log);
1006 }
1007
1008 static void qtest_set_chardev(Object *obj, const char *value, Error **errp)
1009 {
1010     QTest *q = QTEST(obj);
1011     Chardev *chr;
1012
1013     if (qtest == q) {
1014         error_setg(errp, "Property 'chardev' can not be set now");
1015         return;
1016     }
1017
1018     chr = qemu_chr_find(value);
1019     if (!chr) {
1020         error_setg(errp, "Cannot find character device '%s'", value);
1021         return;
1022     }
1023
1024     g_free(q->chr_name);
1025     q->chr_name = g_strdup(value);
1026
1027     if (q->chr) {
1028         object_unref(q->chr);
1029     }
1030     q->chr = chr;
1031     object_ref(chr);
1032 }
1033
1034 static char *qtest_get_chardev(Object *obj, Error **errp)
1035 {
1036     QTest *q = QTEST(obj);
1037
1038     return g_strdup(q->chr_name);
1039 }
1040
1041 static void qtest_class_init(ObjectClass *oc, void *data)
1042 {
1043     UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
1044
1045     oc->unparent = qtest_unparent;
1046     ucc->complete = qtest_complete;
1047
1048     object_class_property_add_str(oc, "chardev",
1049                                   qtest_get_chardev, qtest_set_chardev);
1050     object_class_property_add_str(oc, "log",
1051                                   qtest_get_log, qtest_set_log);
1052 }
1053
1054 static const TypeInfo qtest_info = {
1055     .name = TYPE_QTEST,
1056     .parent = TYPE_OBJECT,
1057     .class_init = qtest_class_init,
1058     .instance_size = sizeof(QTest),
1059     .interfaces = (InterfaceInfo[]) {
1060         { TYPE_USER_CREATABLE },
1061         { }
1062     }
1063 };
1064
1065 static void register_types(void)
1066 {
1067     type_register_static(&qtest_info);
1068 }
1069
1070 type_init(register_types);