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 "cpu.h"
  17 #include "sysemu/qtest.h"
  18 #include "sysemu/runstate.h"
  19 #include "chardev/char-fe.h"
  20 #include "exec/ioport.h"
  21 #include "exec/memory.h"
  22 #include "hw/irq.h"
  23 #include "sysemu/accel.h"
  24 #include "sysemu/cpus.h"
  25 #include "qemu/config-file.h"
  26 #include "qemu/option.h"
  27 #include "qemu/error-report.h"
  28 #include "qemu/module.h"
  29 #include "qemu/cutils.h"
  30 #ifdef TARGET_PPC64
  31 #include "hw/ppc/spapr_rtas.h"
  32 #endif
  33
  34 #define MAX_IRQ 256
  35
  36 bool qtest_allowed;
  37
  38 static DeviceState *irq_intercept_dev;
  39 static FILE *qtest_log_fp;
  40 static CharBackend qtest_chr;
  41 static GString *inbuf;
  42 static int irq_levels[MAX_IRQ];
  43 static qemu_timeval start_time;
  44 static bool qtest_opened;
  45
  46 #define FMT_timeval "%ld.%06ld"
  47
  48 /**
  49  * QTest Protocol
  50  *
  51  * Line based protocol, request/response based.  Server can send async messages
  52  * so clients should always handle many async messages before the response
  53  * comes in.
  54  *
  55  * Valid requests
  56  *
  57  * Clock management:
  58  *
  59  * The qtest client is completely in charge of the QEMU_CLOCK_VIRTUAL.  qtest commands
  60  * let you adjust the value of the clock (monotonically).  All the commands
  61  * return the current value of the clock in nanoseconds.
  62  *
  63  *  > clock_step
  64  *  < OK VALUE
  65  *
  66  *     Advance the clock to the next deadline.  Useful when waiting for
  67  *     asynchronous events.
  68  *
  69  *  > clock_step NS
  70  *  < OK VALUE
  71  *
  72  *     Advance the clock by NS nanoseconds.
  73  *
  74  *  > clock_set NS
  75  *  < OK VALUE
  76  *
  77  *     Advance the clock to NS nanoseconds (do nothing if it's already past).
  78  *
  79  * PIO and memory access:
  80  *
  81  *  > outb ADDR VALUE
  82  *  < OK
  83  *
  84  *  > outw ADDR VALUE
  85  *  < OK
  86  *
  87  *  > outl ADDR VALUE
  88  *  < OK
  89  *
  90  *  > inb ADDR
  91  *  < OK VALUE
  92  *
  93  *  > inw ADDR
  94  *  < OK VALUE
  95  *
  96  *  > inl ADDR
  97  *  < OK VALUE
  98  *
  99  *  > writeb ADDR VALUE
 100  *  < OK
 101  *
 102  *  > writew ADDR VALUE
 103  *  < OK
 104  *
 105  *  > writel ADDR VALUE
 106  *  < OK
 107  *
 108  *  > writeq ADDR VALUE
 109  *  < OK
 110  *
 111  *  > readb ADDR
 112  *  < OK VALUE
 113  *
 114  *  > readw ADDR
 115  *  < OK VALUE
 116  *
 117  *  > readl ADDR
 118  *  < OK VALUE
 119  *
 120  *  > readq ADDR
 121  *  < OK VALUE
 122  *
 123  *  > read ADDR SIZE
 124  *  < OK DATA
 125  *
 126  *  > write ADDR SIZE DATA
 127  *  < OK
 128  *
 129  *  > b64read ADDR SIZE
 130  *  < OK B64_DATA
 131  *
 132  *  > b64write ADDR SIZE B64_DATA
 133  *  < OK
 134  *
 135  *  > memset ADDR SIZE VALUE
 136  *  < OK
 137  *
 138  * ADDR, SIZE, VALUE are all integers parsed with strtoul() with a base of 0.
 139  * For 'memset' a zero size is permitted and does nothing.
 140  *
 141  * DATA is an arbitrarily long hex number prefixed with '0x'.  If it's smaller
 142  * than the expected size, the value will be zero filled at the end of the data
 143  * sequence.
 144  *
 145  * B64_DATA is an arbitrarily long base64 encoded string.
 146  * If the sizes do not match, the data will be truncated.
 147  *
 148  * IRQ management:
 149  *
 150  *  > irq_intercept_in QOM-PATH
 151  *  < OK
 152  *
 153  *  > irq_intercept_out QOM-PATH
 154  *  < OK
 155  *
 156  * Attach to the gpio-in (resp. gpio-out) pins exported by the device at
 157  * QOM-PATH.  When the pin is triggered, one of the following async messages
 158  * will be printed to the qtest stream:
 159  *
 160  *  IRQ raise NUM
 161  *  IRQ lower NUM
 162  *
 163  * where NUM is an IRQ number.  For the PC, interrupts can be intercepted
 164  * simply with "irq_intercept_in ioapic" (note that IRQ0 comes out with
 165  * NUM=0 even though it is remapped to GSI 2).
 166  *
 167  * Setting interrupt level:
 168  *
 169  *  > set_irq_in QOM-PATH NAME NUM LEVEL
 170  *  < OK
 171  *
 172  *  where NAME is the name of the irq/gpio list, NUM is an IRQ number and
 173  *  LEVEL is an signed integer IRQ level.
 174  *
 175  * Forcibly set the given interrupt pin to the given level.
 176  *
 177  */
 178
 179 static int hex2nib(char ch)
 180 {
 181     if (ch >= '0' && ch <= '9') {
 182         return ch - '0';
 183     } else if (ch >= 'a' && ch <= 'f') {
 184         return 10 + (ch - 'a');
 185     } else if (ch >= 'A' && ch <= 'F') {
 186         return 10 + (ch - 'A');
 187     } else {
 188         return -1;
 189     }
 190 }
 191
 192 static void qtest_get_time(qemu_timeval *tv)
 193 {
 194     qemu_gettimeofday(tv);
 195     tv->tv_sec -= start_time.tv_sec;
 196     tv->tv_usec -= start_time.tv_usec;
 197     if (tv->tv_usec < 0) {
 198         tv->tv_usec += 1000000;
 199         tv->tv_sec -= 1;
 200     }
 201 }
 202
 203 static void qtest_send_prefix(CharBackend *chr)
 204 {
 205     qemu_timeval tv;
 206
 207     if (!qtest_log_fp || !qtest_opened) {
 208         return;
 209     }
 210
 211     qtest_get_time(&tv);
 212     fprintf(qtest_log_fp, "[S +" FMT_timeval "] ",
 213             (long) tv.tv_sec, (long) tv.tv_usec);
 214 }
 215
 216 static void GCC_FMT_ATTR(1, 2) qtest_log_send(const char *fmt, ...)
 217 {
 218     va_list ap;
 219
 220     if (!qtest_log_fp || !qtest_opened) {
 221         return;
 222     }
 223
 224     qtest_send_prefix(NULL);
 225
 226     va_start(ap, fmt);
 227     vfprintf(qtest_log_fp, fmt, ap);
 228     va_end(ap);
 229 }
 230
 231 static void do_qtest_send(CharBackend *chr, const char *str, size_t len)
 232 {
 233     qemu_chr_fe_write_all(chr, (uint8_t *)str, len);
 234     if (qtest_log_fp && qtest_opened) {
 235         fprintf(qtest_log_fp, "%s", str);
 236     }
 237 }
 238
 239 static void qtest_send(CharBackend *chr, const char *str)
 240 {
 241     do_qtest_send(chr, str, strlen(str));
 242 }
 243
 244 static void GCC_FMT_ATTR(2, 3) qtest_sendf(CharBackend *chr,
 245                                            const char *fmt, ...)
 246 {
 247     va_list ap;
 248     gchar *buffer;
 249
 250     va_start(ap, fmt);
 251     buffer = g_strdup_vprintf(fmt, ap);
 252     qtest_send(chr, buffer);
 253     g_free(buffer);
 254     va_end(ap);
 255 }
 256
 257 static void qtest_irq_handler(void *opaque, int n, int level)
 258 {
 259     qemu_irq old_irq = *(qemu_irq *)opaque;
 260     qemu_set_irq(old_irq, level);
 261
 262     if (irq_levels[n] != level) {
 263         CharBackend *chr = &qtest_chr;
 264         irq_levels[n] = level;
 265         qtest_send_prefix(chr);
 266         qtest_sendf(chr, "IRQ %s %d\n",
 267                     level ? "raise" : "lower", n);
 268     }
 269 }
 270
 271 static void qtest_process_command(CharBackend *chr, gchar **words)
 272 {
 273     const gchar *command;
 274
 275     g_assert(words);
 276
 277     command = words[0];
 278
 279     if (qtest_log_fp) {
 280         qemu_timeval tv;
 281         int i;
 282
 283         qtest_get_time(&tv);
 284         fprintf(qtest_log_fp, "[R +" FMT_timeval "]",
 285                 (long) tv.tv_sec, (long) tv.tv_usec);
 286         for (i = 0; words[i]; i++) {
 287             fprintf(qtest_log_fp, " %s", words[i]);
 288         }
 289         fprintf(qtest_log_fp, "\n");
 290     }
 291
 292     g_assert(command);
 293     if (strcmp(words[0], "irq_intercept_out") == 0
 294         || strcmp(words[0], "irq_intercept_in") == 0) {
 295         DeviceState *dev;
 296         NamedGPIOList *ngl;
 297
 298         g_assert(words[1]);
 299         dev = DEVICE(object_resolve_path(words[1], NULL));
 300         if (!dev) {
 301             qtest_send_prefix(chr);
 302             qtest_send(chr, "FAIL Unknown device\n");
 303             return;
 304         }
 305
 306         if (irq_intercept_dev) {
 307             qtest_send_prefix(chr);
 308             if (irq_intercept_dev != dev) {
 309                 qtest_send(chr, "FAIL IRQ intercept already enabled\n");
 310             } else {
 311                 qtest_send(chr, "OK\n");
 312             }
 313             return;
 314         }
 315
 316         QLIST_FOREACH(ngl, &dev->gpios, node) {
 317             /* We don't support intercept of named GPIOs yet */
 318             if (ngl->name) {
 319                 continue;
 320             }
 321             if (words[0][14] == 'o') {
 322                 int i;
 323                 for (i = 0; i < ngl->num_out; ++i) {
 324                     qemu_irq *disconnected = g_new0(qemu_irq, 1);
 325                     qemu_irq icpt = qemu_allocate_irq(qtest_irq_handler,
 326                                                       disconnected, i);
 327
 328                     *disconnected = qdev_intercept_gpio_out(dev, icpt,
 329                                                             ngl->name, i);
 330                 }
 331             } else {
 332                 qemu_irq_intercept_in(ngl->in, qtest_irq_handler,
 333                                       ngl->num_in);
 334             }
 335         }
 336         irq_intercept_dev = dev;
 337         qtest_send_prefix(chr);
 338         qtest_send(chr, "OK\n");
 339     } else if (strcmp(words[0], "set_irq_in") == 0) {
 340         DeviceState *dev;
 341         qemu_irq irq;
 342         char *name;
 343         int ret;
 344         int num;
 345         int level;
 346
 347         g_assert(words[1] && words[2] && words[3] && words[4]);
 348
 349         dev = DEVICE(object_resolve_path(words[1], NULL));
 350         if (!dev) {
 351             qtest_send_prefix(chr);
 352             qtest_send(chr, "FAIL Unknown device\n");
 353             return;
 354         }
 355
 356         if (strcmp(words[2], "unnamed-gpio-in") == 0) {
 357             name = NULL;
 358         } else {
 359             name = words[2];
 360         }
 361
 362         ret = qemu_strtoi(words[3], NULL, 0, &num);
 363         g_assert(!ret);
 364         ret = qemu_strtoi(words[4], NULL, 0, &level);
 365         g_assert(!ret);
 366
 367         irq = qdev_get_gpio_in_named(dev, name, num);
 368
 369         qemu_set_irq(irq, level);
 370         qtest_send_prefix(chr);
 371         qtest_send(chr, "OK\n");
 372     } else if (strcmp(words[0], "outb") == 0 ||
 373                strcmp(words[0], "outw") == 0 ||
 374                strcmp(words[0], "outl") == 0) {
 375         unsigned long addr;
 376         unsigned long value;
 377         int ret;
 378
 379         g_assert(words[1] && words[2]);
 380         ret = qemu_strtoul(words[1], NULL, 0, &addr);
 381         g_assert(ret == 0);
 382         ret = qemu_strtoul(words[2], NULL, 0, &value);
 383         g_assert(ret == 0);
 384         g_assert(addr <= 0xffff);
 385
 386         if (words[0][3] == 'b') {
 387             cpu_outb(addr, value);
 388         } else if (words[0][3] == 'w') {
 389             cpu_outw(addr, value);
 390         } else if (words[0][3] == 'l') {
 391             cpu_outl(addr, value);
 392         }
 393         qtest_send_prefix(chr);
 394         qtest_send(chr, "OK\n");
 395     } else if (strcmp(words[0], "inb") == 0 ||
 396         strcmp(words[0], "inw") == 0 ||
 397         strcmp(words[0], "inl") == 0) {
 398         unsigned long addr;
 399         uint32_t value = -1U;
 400         int ret;
 401
 402         g_assert(words[1]);
 403         ret = qemu_strtoul(words[1], NULL, 0, &addr);
 404         g_assert(ret == 0);
 405         g_assert(addr <= 0xffff);
 406
 407         if (words[0][2] == 'b') {
 408             value = cpu_inb(addr);
 409         } else if (words[0][2] == 'w') {
 410             value = cpu_inw(addr);
 411         } else if (words[0][2] == 'l') {
 412             value = cpu_inl(addr);
 413         }
 414         qtest_send_prefix(chr);
 415         qtest_sendf(chr, "OK 0x%04x\n", value);
 416     } else if (strcmp(words[0], "writeb") == 0 ||
 417                strcmp(words[0], "writew") == 0 ||
 418                strcmp(words[0], "writel") == 0 ||
 419                strcmp(words[0], "writeq") == 0) {
 420         uint64_t addr;
 421         uint64_t value;
 422         int ret;
 423
 424         g_assert(words[1] && words[2]);
 425         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 426         g_assert(ret == 0);
 427         ret = qemu_strtou64(words[2], NULL, 0, &value);
 428         g_assert(ret == 0);
 429
 430         if (words[0][5] == 'b') {
 431             uint8_t data = value;
 432             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 433                              &data, 1, true);
 434         } else if (words[0][5] == 'w') {
 435             uint16_t data = value;
 436             tswap16s(&data);
 437             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 438                              (uint8_t *) &data, 2, true);
 439         } else if (words[0][5] == 'l') {
 440             uint32_t data = value;
 441             tswap32s(&data);
 442             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 443                              (uint8_t *) &data, 4, true);
 444         } else if (words[0][5] == 'q') {
 445             uint64_t data = value;
 446             tswap64s(&data);
 447             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 448                              (uint8_t *) &data, 8, true);
 449         }
 450         qtest_send_prefix(chr);
 451         qtest_send(chr, "OK\n");
 452     } else if (strcmp(words[0], "readb") == 0 ||
 453                strcmp(words[0], "readw") == 0 ||
 454                strcmp(words[0], "readl") == 0 ||
 455                strcmp(words[0], "readq") == 0) {
 456         uint64_t addr;
 457         uint64_t value = UINT64_C(-1);
 458         int ret;
 459
 460         g_assert(words[1]);
 461         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 462         g_assert(ret == 0);
 463
 464         if (words[0][4] == 'b') {
 465             uint8_t data;
 466             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 467                              &data, 1, false);
 468             value = data;
 469         } else if (words[0][4] == 'w') {
 470             uint16_t data;
 471             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 472                              (uint8_t *) &data, 2, false);
 473             value = tswap16(data);
 474         } else if (words[0][4] == 'l') {
 475             uint32_t data;
 476             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 477                              (uint8_t *) &data, 4, false);
 478             value = tswap32(data);
 479         } else if (words[0][4] == 'q') {
 480             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 481                              (uint8_t *) &value, 8, false);
 482             tswap64s(&value);
 483         }
 484         qtest_send_prefix(chr);
 485         qtest_sendf(chr, "OK 0x%016" PRIx64 "\n", value);
 486     } else if (strcmp(words[0], "read") == 0) {
 487         uint64_t addr, len, i;
 488         uint8_t *data;
 489         char *enc;
 490         int ret;
 491
 492         g_assert(words[1] && words[2]);
 493         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 494         g_assert(ret == 0);
 495         ret = qemu_strtou64(words[2], NULL, 0, &len);
 496         g_assert(ret == 0);
 497         /* We'd send garbage to libqtest if len is 0 */
 498         g_assert(len);
 499
 500         data = g_malloc(len);
 501         address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 502                          data, len, false);
 503
 504         enc = g_malloc(2 * len + 1);
 505         for (i = 0; i < len; i++) {
 506             sprintf(&enc[i * 2], "%02x", data[i]);
 507         }
 508
 509         qtest_send_prefix(chr);
 510         qtest_sendf(chr, "OK 0x%s\n", enc);
 511
 512         g_free(data);
 513         g_free(enc);
 514     } else if (strcmp(words[0], "b64read") == 0) {
 515         uint64_t addr, len;
 516         uint8_t *data;
 517         gchar *b64_data;
 518         int ret;
 519
 520         g_assert(words[1] && words[2]);
 521         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 522         g_assert(ret == 0);
 523         ret = qemu_strtou64(words[2], NULL, 0, &len);
 524         g_assert(ret == 0);
 525
 526         data = g_malloc(len);
 527         address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 528                          data, len, false);
 529         b64_data = g_base64_encode(data, len);
 530         qtest_send_prefix(chr);
 531         qtest_sendf(chr, "OK %s\n", b64_data);
 532
 533         g_free(data);
 534         g_free(b64_data);
 535     } else if (strcmp(words[0], "write") == 0) {
 536         uint64_t addr, len, i;
 537         uint8_t *data;
 538         size_t data_len;
 539         int ret;
 540
 541         g_assert(words[1] && words[2] && words[3]);
 542         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 543         g_assert(ret == 0);
 544         ret = qemu_strtou64(words[2], NULL, 0, &len);
 545         g_assert(ret == 0);
 546
 547         data_len = strlen(words[3]);
 548         if (data_len < 3) {
 549             qtest_send(chr, "ERR invalid argument size\n");
 550             return;
 551         }
 552
 553         data = g_malloc(len);
 554         for (i = 0; i < len; i++) {
 555             if ((i * 2 + 4) <= data_len) {
 556                 data[i] = hex2nib(words[3][i * 2 + 2]) << 4;
 557                 data[i] |= hex2nib(words[3][i * 2 + 3]);
 558             } else {
 559                 data[i] = 0;
 560             }
 561         }
 562         address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 563                          data, len, true);
 564         g_free(data);
 565
 566         qtest_send_prefix(chr);
 567         qtest_send(chr, "OK\n");
 568     } else if (strcmp(words[0], "memset") == 0) {
 569         uint64_t addr, len;
 570         uint8_t *data;
 571         unsigned long pattern;
 572         int ret;
 573
 574         g_assert(words[1] && words[2] && words[3]);
 575         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 576         g_assert(ret == 0);
 577         ret = qemu_strtou64(words[2], NULL, 0, &len);
 578         g_assert(ret == 0);
 579         ret = qemu_strtoul(words[3], NULL, 0, &pattern);
 580         g_assert(ret == 0);
 581
 582         if (len) {
 583             data = g_malloc(len);
 584             memset(data, pattern, len);
 585             address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 586                              data, len, true);
 587             g_free(data);
 588         }
 589
 590         qtest_send_prefix(chr);
 591         qtest_send(chr, "OK\n");
 592     }  else if (strcmp(words[0], "b64write") == 0) {
 593         uint64_t addr, len;
 594         uint8_t *data;
 595         size_t data_len;
 596         gsize out_len;
 597         int ret;
 598
 599         g_assert(words[1] && words[2] && words[3]);
 600         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 601         g_assert(ret == 0);
 602         ret = qemu_strtou64(words[2], NULL, 0, &len);
 603         g_assert(ret == 0);
 604
 605         data_len = strlen(words[3]);
 606         if (data_len < 3) {
 607             qtest_send(chr, "ERR invalid argument size\n");
 608             return;
 609         }
 610
 611         data = g_base64_decode_inplace(words[3], &out_len);
 612         if (out_len != len) {
 613             qtest_log_send("b64write: data length mismatch (told %"PRIu64", "
 614                            "found %zu)\n",
 615                            len, out_len);
 616             out_len = MIN(out_len, len);
 617         }
 618
 619         address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 620                          data, len, true);
 621
 622         qtest_send_prefix(chr);
 623         qtest_send(chr, "OK\n");
 624     } else if (strcmp(words[0], "endianness") == 0) {
 625         qtest_send_prefix(chr);
 626 #if defined(TARGET_WORDS_BIGENDIAN)
 627         qtest_sendf(chr, "OK big\n");
 628 #else
 629         qtest_sendf(chr, "OK little\n");
 630 #endif
 631 #ifdef TARGET_PPC64
 632     } else if (strcmp(words[0], "rtas") == 0) {
 633         uint64_t res, args, ret;
 634         unsigned long nargs, nret;
 635         int rc;
 636
 637         rc = qemu_strtoul(words[2], NULL, 0, &nargs);
 638         g_assert(rc == 0);
 639         rc = qemu_strtou64(words[3], NULL, 0, &args);
 640         g_assert(rc == 0);
 641         rc = qemu_strtoul(words[4], NULL, 0, &nret);
 642         g_assert(rc == 0);
 643         rc = qemu_strtou64(words[5], NULL, 0, &ret);
 644         g_assert(rc == 0);
 645         res = qtest_rtas_call(words[1], nargs, args, nret, ret);
 646
 647         qtest_send_prefix(chr);
 648         qtest_sendf(chr, "OK %"PRIu64"\n", res);
 649 #endif
 650     } else if (qtest_enabled() && strcmp(words[0], "clock_step") == 0) {
 651         int64_t ns;
 652
 653         if (words[1]) {
 654             int ret = qemu_strtoi64(words[1], NULL, 0, &ns);
 655             g_assert(ret == 0);
 656         } else {
 657             ns = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
 658         }
 659         qtest_clock_warp(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + ns);
 660         qtest_send_prefix(chr);
 661         qtest_sendf(chr, "OK %"PRIi64"\n",
 662                     (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 663     } else if (qtest_enabled() && strcmp(words[0], "clock_set") == 0) {
 664         int64_t ns;
 665         int ret;
 666
 667         g_assert(words[1]);
 668         ret = qemu_strtoi64(words[1], NULL, 0, &ns);
 669         g_assert(ret == 0);
 670         qtest_clock_warp(ns);
 671         qtest_send_prefix(chr);
 672         qtest_sendf(chr, "OK %"PRIi64"\n",
 673                     (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 674     } else {
 675         qtest_send_prefix(chr);
 676         qtest_sendf(chr, "FAIL Unknown command '%s'\n", words[0]);
 677     }
 678 }
 679
 680 static void qtest_process_inbuf(CharBackend *chr, GString *inbuf)
 681 {
 682     char *end;
 683
 684     while ((end = strchr(inbuf->str, '\n')) != NULL) {
 685         size_t offset;
 686         GString *cmd;
 687         gchar **words;
 688
 689         offset = end - inbuf->str;
 690
 691         cmd = g_string_new_len(inbuf->str, offset);
 692         g_string_erase(inbuf, 0, offset + 1);
 693
 694         words = g_strsplit(cmd->str, " ", 0);
 695         qtest_process_command(chr, words);
 696         g_strfreev(words);
 697
 698         g_string_free(cmd, TRUE);
 699     }
 700 }
 701
 702 static void qtest_read(void *opaque, const uint8_t *buf, int size)
 703 {
 704     CharBackend *chr = opaque;
 705
 706     g_string_append_len(inbuf, (const gchar *)buf, size);
 707     qtest_process_inbuf(chr, inbuf);
 708 }
 709
 710 static int qtest_can_read(void *opaque)
 711 {
 712     return 1024;
 713 }
 714
 715 static void qtest_event(void *opaque, int event)
 716 {
 717     int i;
 718
 719     switch (event) {
 720     case CHR_EVENT_OPENED:
 721         /*
 722          * We used to call qemu_system_reset() here, hoping we could
 723          * use the same process for multiple tests that way.  Never
 724          * used.  Injects an extra reset even when it's not used, and
 725          * that can mess up tests, e.g. -boot once.
 726          */
 727         for (i = 0; i < ARRAY_SIZE(irq_levels); i++) {
 728             irq_levels[i] = 0;
 729         }
 730         qemu_gettimeofday(&start_time);
 731         qtest_opened = true;
 732         if (qtest_log_fp) {
 733             fprintf(qtest_log_fp, "[I " FMT_timeval "] OPENED\n",
 734                     (long) start_time.tv_sec, (long) start_time.tv_usec);
 735         }
 736         break;
 737     case CHR_EVENT_CLOSED:
 738         qtest_opened = false;
 739         if (qtest_log_fp) {
 740             qemu_timeval tv;
 741             qtest_get_time(&tv);
 742             fprintf(qtest_log_fp, "[I +" FMT_timeval "] CLOSED\n",
 743                     (long) tv.tv_sec, (long) tv.tv_usec);
 744         }
 745         break;
 746     default:
 747         break;
 748     }
 749 }
 750 void qtest_server_init(const char *qtest_chrdev, const char *qtest_log, Error **errp)
 751 {
 752     Chardev *chr;
 753
 754     chr = qemu_chr_new("qtest", qtest_chrdev, NULL);
 755
 756     if (chr == NULL) {
 757         error_setg(errp, "Failed to initialize device for qtest: \"%s\"",
 758                    qtest_chrdev);
 759         return;
 760     }
 761
 762     if (qtest_log) {
 763         if (strcmp(qtest_log, "none") != 0) {
 764             qtest_log_fp = fopen(qtest_log, "w+");
 765         }
 766     } else {
 767         qtest_log_fp = stderr;
 768     }
 769
 770     qemu_chr_fe_init(&qtest_chr, chr, errp);
 771     qemu_chr_fe_set_handlers(&qtest_chr, qtest_can_read, qtest_read,
 772                              qtest_event, NULL, &qtest_chr, NULL, true);
 773     qemu_chr_fe_set_echo(&qtest_chr, true);
 774
 775     inbuf = g_string_new("");
 776 }
 777
 778 bool qtest_driver(void)
 779 {
 780     return qtest_chr.chr != NULL;
 781 }