softmmu/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 #include "config-devices.h"
  31 #ifdef CONFIG_PSERIES
  32 #include "hw/ppc/spapr_rtas.h"
  33 #endif
  34
  35 #define MAX_IRQ 256
  36
  37 bool qtest_allowed;
  38
  39 static DeviceState *irq_intercept_dev;
  40 static FILE *qtest_log_fp;
  41 static CharBackend qtest_chr;
  42 static GString *inbuf;
  43 static int irq_levels[MAX_IRQ];
  44 static qemu_timeval start_time;
  45 static bool qtest_opened;
  46 static void (*qtest_server_send)(void*, const char*);
  47 static void *qtest_server_send_opaque;
  48
  49 #define FMT_timeval "%ld.%06ld"
  50
  51 /**
  52  * QTest Protocol
  53  *
  54  * Line based protocol, request/response based.  Server can send async messages
  55  * so clients should always handle many async messages before the response
  56  * comes in.
  57  *
  58  * Valid requests
  59  *
  60  * Clock management:
  61  *
  62  * The qtest client is completely in charge of the QEMU_CLOCK_VIRTUAL.  qtest commands
  63  * let you adjust the value of the clock (monotonically).  All the commands
  64  * return the current value of the clock in nanoseconds.
  65  *
  66  *  > clock_step
  67  *  < OK VALUE
  68  *
  69  *     Advance the clock to the next deadline.  Useful when waiting for
  70  *     asynchronous events.
  71  *
  72  *  > clock_step NS
  73  *  < OK VALUE
  74  *
  75  *     Advance the clock by NS nanoseconds.
  76  *
  77  *  > clock_set NS
  78  *  < OK VALUE
  79  *
  80  *     Advance the clock to NS nanoseconds (do nothing if it's already past).
  81  *
  82  * PIO and memory access:
  83  *
  84  *  > outb ADDR VALUE
  85  *  < OK
  86  *
  87  *  > outw ADDR VALUE
  88  *  < OK
  89  *
  90  *  > outl ADDR VALUE
  91  *  < OK
  92  *
  93  *  > inb ADDR
  94  *  < OK VALUE
  95  *
  96  *  > inw ADDR
  97  *  < OK VALUE
  98  *
  99  *  > inl ADDR
 100  *  < OK VALUE
 101  *
 102  *  > writeb ADDR VALUE
 103  *  < OK
 104  *
 105  *  > writew ADDR VALUE
 106  *  < OK
 107  *
 108  *  > writel ADDR VALUE
 109  *  < OK
 110  *
 111  *  > writeq ADDR VALUE
 112  *  < OK
 113  *
 114  *  > readb ADDR
 115  *  < OK VALUE
 116  *
 117  *  > readw ADDR
 118  *  < OK VALUE
 119  *
 120  *  > readl ADDR
 121  *  < OK VALUE
 122  *
 123  *  > readq ADDR
 124  *  < OK VALUE
 125  *
 126  *  > read ADDR SIZE
 127  *  < OK DATA
 128  *
 129  *  > write ADDR SIZE DATA
 130  *  < OK
 131  *
 132  *  > b64read ADDR SIZE
 133  *  < OK B64_DATA
 134  *
 135  *  > b64write ADDR SIZE B64_DATA
 136  *  < OK
 137  *
 138  *  > memset ADDR SIZE VALUE
 139  *  < OK
 140  *
 141  * ADDR, SIZE, VALUE are all integers parsed with strtoul() with a base of 0.
 142  * For 'memset' a zero size is permitted and does nothing.
 143  *
 144  * DATA is an arbitrarily long hex number prefixed with '0x'.  If it's smaller
 145  * than the expected size, the value will be zero filled at the end of the data
 146  * sequence.
 147  *
 148  * B64_DATA is an arbitrarily long base64 encoded string.
 149  * If the sizes do not match, the data will be truncated.
 150  *
 151  * IRQ management:
 152  *
 153  *  > irq_intercept_in QOM-PATH
 154  *  < OK
 155  *
 156  *  > irq_intercept_out QOM-PATH
 157  *  < OK
 158  *
 159  * Attach to the gpio-in (resp. gpio-out) pins exported by the device at
 160  * QOM-PATH.  When the pin is triggered, one of the following async messages
 161  * will be printed to the qtest stream:
 162  *
 163  *  IRQ raise NUM
 164  *  IRQ lower NUM
 165  *
 166  * where NUM is an IRQ number.  For the PC, interrupts can be intercepted
 167  * simply with "irq_intercept_in ioapic" (note that IRQ0 comes out with
 168  * NUM=0 even though it is remapped to GSI 2).
 169  *
 170  * Setting interrupt level:
 171  *
 172  *  > set_irq_in QOM-PATH NAME NUM LEVEL
 173  *  < OK
 174  *
 175  *  where NAME is the name of the irq/gpio list, NUM is an IRQ number and
 176  *  LEVEL is an signed integer IRQ level.
 177  *
 178  * Forcibly set the given interrupt pin to the given level.
 179  *
 180  */
 181
 182 static int hex2nib(char ch)
 183 {
 184     if (ch >= '0' && ch <= '9') {
 185         return ch - '0';
 186     } else if (ch >= 'a' && ch <= 'f') {
 187         return 10 + (ch - 'a');
 188     } else if (ch >= 'A' && ch <= 'F') {
 189         return 10 + (ch - 'A');
 190     } else {
 191         return -1;
 192     }
 193 }
 194
 195 static void qtest_get_time(qemu_timeval *tv)
 196 {
 197     qemu_gettimeofday(tv);
 198     tv->tv_sec -= start_time.tv_sec;
 199     tv->tv_usec -= start_time.tv_usec;
 200     if (tv->tv_usec < 0) {
 201         tv->tv_usec += 1000000;
 202         tv->tv_sec -= 1;
 203     }
 204 }
 205
 206 static void qtest_send_prefix(CharBackend *chr)
 207 {
 208     qemu_timeval tv;
 209
 210     if (!qtest_log_fp || !qtest_opened) {
 211         return;
 212     }
 213
 214     qtest_get_time(&tv);
 215     fprintf(qtest_log_fp, "[S +" FMT_timeval "] ",
 216             (long) tv.tv_sec, (long) tv.tv_usec);
 217 }
 218
 219 static void GCC_FMT_ATTR(1, 2) qtest_log_send(const char *fmt, ...)
 220 {
 221     va_list ap;
 222
 223     if (!qtest_log_fp || !qtest_opened) {
 224         return;
 225     }
 226
 227     qtest_send_prefix(NULL);
 228
 229     va_start(ap, fmt);
 230     vfprintf(qtest_log_fp, fmt, ap);
 231     va_end(ap);
 232 }
 233
 234 static void qtest_server_char_be_send(void *opaque, const char *str)
 235 {
 236     size_t len = strlen(str);
 237     CharBackend* chr = (CharBackend *)opaque;
 238     qemu_chr_fe_write_all(chr, (uint8_t *)str, len);
 239     if (qtest_log_fp && qtest_opened) {
 240         fprintf(qtest_log_fp, "%s", str);
 241     }
 242 }
 243
 244 static void qtest_send(CharBackend *chr, const char *str)
 245 {
 246     qtest_server_send(qtest_server_send_opaque, str);
 247 }
 248
 249 static void GCC_FMT_ATTR(2, 3) qtest_sendf(CharBackend *chr,
 250                                            const char *fmt, ...)
 251 {
 252     va_list ap;
 253     gchar *buffer;
 254
 255     va_start(ap, fmt);
 256     buffer = g_strdup_vprintf(fmt, ap);
 257     qtest_send(chr, buffer);
 258     g_free(buffer);
 259     va_end(ap);
 260 }
 261
 262 static void qtest_irq_handler(void *opaque, int n, int level)
 263 {
 264     qemu_irq old_irq = *(qemu_irq *)opaque;
 265     qemu_set_irq(old_irq, level);
 266
 267     if (irq_levels[n] != level) {
 268         CharBackend *chr = &qtest_chr;
 269         irq_levels[n] = level;
 270         qtest_send_prefix(chr);
 271         qtest_sendf(chr, "IRQ %s %d\n",
 272                     level ? "raise" : "lower", n);
 273     }
 274 }
 275
 276 static void qtest_process_command(CharBackend *chr, gchar **words)
 277 {
 278     const gchar *command;
 279
 280     g_assert(words);
 281
 282     command = words[0];
 283
 284     if (qtest_log_fp) {
 285         qemu_timeval tv;
 286         int i;
 287
 288         qtest_get_time(&tv);
 289         fprintf(qtest_log_fp, "[R +" FMT_timeval "]",
 290                 (long) tv.tv_sec, (long) tv.tv_usec);
 291         for (i = 0; words[i]; i++) {
 292             fprintf(qtest_log_fp, " %s", words[i]);
 293         }
 294         fprintf(qtest_log_fp, "\n");
 295     }
 296
 297     g_assert(command);
 298     if (strcmp(words[0], "irq_intercept_out") == 0
 299         || strcmp(words[0], "irq_intercept_in") == 0) {
 300         DeviceState *dev;
 301         NamedGPIOList *ngl;
 302
 303         g_assert(words[1]);
 304         dev = DEVICE(object_resolve_path(words[1], NULL));
 305         if (!dev) {
 306             qtest_send_prefix(chr);
 307             qtest_send(chr, "FAIL Unknown device\n");
 308             return;
 309         }
 310
 311         if (irq_intercept_dev) {
 312             qtest_send_prefix(chr);
 313             if (irq_intercept_dev != dev) {
 314                 qtest_send(chr, "FAIL IRQ intercept already enabled\n");
 315             } else {
 316                 qtest_send(chr, "OK\n");
 317             }
 318             return;
 319         }
 320
 321         QLIST_FOREACH(ngl, &dev->gpios, node) {
 322             /* We don't support intercept of named GPIOs yet */
 323             if (ngl->name) {
 324                 continue;
 325             }
 326             if (words[0][14] == 'o') {
 327                 int i;
 328                 for (i = 0; i < ngl->num_out; ++i) {
 329                     qemu_irq *disconnected = g_new0(qemu_irq, 1);
 330                     qemu_irq icpt = qemu_allocate_irq(qtest_irq_handler,
 331                                                       disconnected, i);
 332
 333                     *disconnected = qdev_intercept_gpio_out(dev, icpt,
 334                                                             ngl->name, i);
 335                 }
 336             } else {
 337                 qemu_irq_intercept_in(ngl->in, qtest_irq_handler,
 338                                       ngl->num_in);
 339             }
 340         }
 341         irq_intercept_dev = dev;
 342         qtest_send_prefix(chr);
 343         qtest_send(chr, "OK\n");
 344     } else if (strcmp(words[0], "set_irq_in") == 0) {
 345         DeviceState *dev;
 346         qemu_irq irq;
 347         char *name;
 348         int ret;
 349         int num;
 350         int level;
 351
 352         g_assert(words[1] && words[2] && words[3] && words[4]);
 353
 354         dev = DEVICE(object_resolve_path(words[1], NULL));
 355         if (!dev) {
 356             qtest_send_prefix(chr);
 357             qtest_send(chr, "FAIL Unknown device\n");
 358             return;
 359         }
 360
 361         if (strcmp(words[2], "unnamed-gpio-in") == 0) {
 362             name = NULL;
 363         } else {
 364             name = words[2];
 365         }
 366
 367         ret = qemu_strtoi(words[3], NULL, 0, &num);
 368         g_assert(!ret);
 369         ret = qemu_strtoi(words[4], NULL, 0, &level);
 370         g_assert(!ret);
 371
 372         irq = qdev_get_gpio_in_named(dev, name, num);
 373
 374         qemu_set_irq(irq, level);
 375         qtest_send_prefix(chr);
 376         qtest_send(chr, "OK\n");
 377     } else if (strcmp(words[0], "outb") == 0 ||
 378                strcmp(words[0], "outw") == 0 ||
 379                strcmp(words[0], "outl") == 0) {
 380         unsigned long addr;
 381         unsigned long value;
 382         int ret;
 383
 384         g_assert(words[1] && words[2]);
 385         ret = qemu_strtoul(words[1], NULL, 0, &addr);
 386         g_assert(ret == 0);
 387         ret = qemu_strtoul(words[2], NULL, 0, &value);
 388         g_assert(ret == 0);
 389         g_assert(addr <= 0xffff);
 390
 391         if (words[0][3] == 'b') {
 392             cpu_outb(addr, value);
 393         } else if (words[0][3] == 'w') {
 394             cpu_outw(addr, value);
 395         } else if (words[0][3] == 'l') {
 396             cpu_outl(addr, value);
 397         }
 398         qtest_send_prefix(chr);
 399         qtest_send(chr, "OK\n");
 400     } else if (strcmp(words[0], "inb") == 0 ||
 401         strcmp(words[0], "inw") == 0 ||
 402         strcmp(words[0], "inl") == 0) {
 403         unsigned long addr;
 404         uint32_t value = -1U;
 405         int ret;
 406
 407         g_assert(words[1]);
 408         ret = qemu_strtoul(words[1], NULL, 0, &addr);
 409         g_assert(ret == 0);
 410         g_assert(addr <= 0xffff);
 411
 412         if (words[0][2] == 'b') {
 413             value = cpu_inb(addr);
 414         } else if (words[0][2] == 'w') {
 415             value = cpu_inw(addr);
 416         } else if (words[0][2] == 'l') {
 417             value = cpu_inl(addr);
 418         }
 419         qtest_send_prefix(chr);
 420         qtest_sendf(chr, "OK 0x%04x\n", value);
 421     } else if (strcmp(words[0], "writeb") == 0 ||
 422                strcmp(words[0], "writew") == 0 ||
 423                strcmp(words[0], "writel") == 0 ||
 424                strcmp(words[0], "writeq") == 0) {
 425         uint64_t addr;
 426         uint64_t value;
 427         int ret;
 428
 429         g_assert(words[1] && words[2]);
 430         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 431         g_assert(ret == 0);
 432         ret = qemu_strtou64(words[2], NULL, 0, &value);
 433         g_assert(ret == 0);
 434
 435         if (words[0][5] == 'b') {
 436             uint8_t data = value;
 437             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 438                                 &data, 1);
 439         } else if (words[0][5] == 'w') {
 440             uint16_t data = value;
 441             tswap16s(&data);
 442             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 443                                 &data, 2);
 444         } else if (words[0][5] == 'l') {
 445             uint32_t data = value;
 446             tswap32s(&data);
 447             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 448                                 &data, 4);
 449         } else if (words[0][5] == 'q') {
 450             uint64_t data = value;
 451             tswap64s(&data);
 452             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 453                                 &data, 8);
 454         }
 455         qtest_send_prefix(chr);
 456         qtest_send(chr, "OK\n");
 457     } else if (strcmp(words[0], "readb") == 0 ||
 458                strcmp(words[0], "readw") == 0 ||
 459                strcmp(words[0], "readl") == 0 ||
 460                strcmp(words[0], "readq") == 0) {
 461         uint64_t addr;
 462         uint64_t value = UINT64_C(-1);
 463         int ret;
 464
 465         g_assert(words[1]);
 466         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 467         g_assert(ret == 0);
 468
 469         if (words[0][4] == 'b') {
 470             uint8_t data;
 471             address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 472                                &data, 1);
 473             value = data;
 474         } else if (words[0][4] == 'w') {
 475             uint16_t data;
 476             address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 477                                &data, 2);
 478             value = tswap16(data);
 479         } else if (words[0][4] == 'l') {
 480             uint32_t data;
 481             address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 482                                &data, 4);
 483             value = tswap32(data);
 484         } else if (words[0][4] == 'q') {
 485             address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 486                                &value, 8);
 487             tswap64s(&value);
 488         }
 489         qtest_send_prefix(chr);
 490         qtest_sendf(chr, "OK 0x%016" PRIx64 "\n", value);
 491     } else if (strcmp(words[0], "read") == 0) {
 492         uint64_t addr, len, i;
 493         uint8_t *data;
 494         char *enc;
 495         int ret;
 496
 497         g_assert(words[1] && words[2]);
 498         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 499         g_assert(ret == 0);
 500         ret = qemu_strtou64(words[2], NULL, 0, &len);
 501         g_assert(ret == 0);
 502         /* We'd send garbage to libqtest if len is 0 */
 503         g_assert(len);
 504
 505         data = g_malloc(len);
 506         address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
 507                            len);
 508
 509         enc = g_malloc(2 * len + 1);
 510         for (i = 0; i < len; i++) {
 511             sprintf(&enc[i * 2], "%02x", data[i]);
 512         }
 513
 514         qtest_send_prefix(chr);
 515         qtest_sendf(chr, "OK 0x%s\n", enc);
 516
 517         g_free(data);
 518         g_free(enc);
 519     } else if (strcmp(words[0], "b64read") == 0) {
 520         uint64_t addr, len;
 521         uint8_t *data;
 522         gchar *b64_data;
 523         int ret;
 524
 525         g_assert(words[1] && words[2]);
 526         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 527         g_assert(ret == 0);
 528         ret = qemu_strtou64(words[2], NULL, 0, &len);
 529         g_assert(ret == 0);
 530
 531         data = g_malloc(len);
 532         address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
 533                            len);
 534         b64_data = g_base64_encode(data, len);
 535         qtest_send_prefix(chr);
 536         qtest_sendf(chr, "OK %s\n", b64_data);
 537
 538         g_free(data);
 539         g_free(b64_data);
 540     } else if (strcmp(words[0], "write") == 0) {
 541         uint64_t addr, len, i;
 542         uint8_t *data;
 543         size_t data_len;
 544         int ret;
 545
 546         g_assert(words[1] && words[2] && words[3]);
 547         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 548         g_assert(ret == 0);
 549         ret = qemu_strtou64(words[2], NULL, 0, &len);
 550         g_assert(ret == 0);
 551
 552         data_len = strlen(words[3]);
 553         if (data_len < 3) {
 554             qtest_send(chr, "ERR invalid argument size\n");
 555             return;
 556         }
 557
 558         data = g_malloc(len);
 559         for (i = 0; i < len; i++) {
 560             if ((i * 2 + 4) <= data_len) {
 561                 data[i] = hex2nib(words[3][i * 2 + 2]) << 4;
 562                 data[i] |= hex2nib(words[3][i * 2 + 3]);
 563             } else {
 564                 data[i] = 0;
 565             }
 566         }
 567         address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
 568                             len);
 569         g_free(data);
 570
 571         qtest_send_prefix(chr);
 572         qtest_send(chr, "OK\n");
 573     } else if (strcmp(words[0], "memset") == 0) {
 574         uint64_t addr, len;
 575         uint8_t *data;
 576         unsigned long pattern;
 577         int ret;
 578
 579         g_assert(words[1] && words[2] && words[3]);
 580         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 581         g_assert(ret == 0);
 582         ret = qemu_strtou64(words[2], NULL, 0, &len);
 583         g_assert(ret == 0);
 584         ret = qemu_strtoul(words[3], NULL, 0, &pattern);
 585         g_assert(ret == 0);
 586
 587         if (len) {
 588             data = g_malloc(len);
 589             memset(data, pattern, len);
 590             address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
 591                                 data, len);
 592             g_free(data);
 593         }
 594
 595         qtest_send_prefix(chr);
 596         qtest_send(chr, "OK\n");
 597     }  else if (strcmp(words[0], "b64write") == 0) {
 598         uint64_t addr, len;
 599         uint8_t *data;
 600         size_t data_len;
 601         gsize out_len;
 602         int ret;
 603
 604         g_assert(words[1] && words[2] && words[3]);
 605         ret = qemu_strtou64(words[1], NULL, 0, &addr);
 606         g_assert(ret == 0);
 607         ret = qemu_strtou64(words[2], NULL, 0, &len);
 608         g_assert(ret == 0);
 609
 610         data_len = strlen(words[3]);
 611         if (data_len < 3) {
 612             qtest_send(chr, "ERR invalid argument size\n");
 613             return;
 614         }
 615
 616         data = g_base64_decode_inplace(words[3], &out_len);
 617         if (out_len != len) {
 618             qtest_log_send("b64write: data length mismatch (told %"PRIu64", "
 619                            "found %zu)\n",
 620                            len, out_len);
 621             out_len = MIN(out_len, len);
 622         }
 623
 624         address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
 625                             len);
 626
 627         qtest_send_prefix(chr);
 628         qtest_send(chr, "OK\n");
 629     } else if (strcmp(words[0], "endianness") == 0) {
 630         qtest_send_prefix(chr);
 631 #if defined(TARGET_WORDS_BIGENDIAN)
 632         qtest_sendf(chr, "OK big\n");
 633 #else
 634         qtest_sendf(chr, "OK little\n");
 635 #endif
 636 #ifdef CONFIG_PSERIES
 637     } else if (strcmp(words[0], "rtas") == 0) {
 638         uint64_t res, args, ret;
 639         unsigned long nargs, nret;
 640         int rc;
 641
 642         rc = qemu_strtoul(words[2], NULL, 0, &nargs);
 643         g_assert(rc == 0);
 644         rc = qemu_strtou64(words[3], NULL, 0, &args);
 645         g_assert(rc == 0);
 646         rc = qemu_strtoul(words[4], NULL, 0, &nret);
 647         g_assert(rc == 0);
 648         rc = qemu_strtou64(words[5], NULL, 0, &ret);
 649         g_assert(rc == 0);
 650         res = qtest_rtas_call(words[1], nargs, args, nret, ret);
 651
 652         qtest_send_prefix(chr);
 653         qtest_sendf(chr, "OK %"PRIu64"\n", res);
 654 #endif
 655     } else if (qtest_enabled() && strcmp(words[0], "clock_step") == 0) {
 656         int64_t ns;
 657
 658         if (words[1]) {
 659             int ret = qemu_strtoi64(words[1], NULL, 0, &ns);
 660             g_assert(ret == 0);
 661         } else {
 662             ns = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
 663                                             QEMU_TIMER_ATTR_ALL);
 664         }
 665         qtest_clock_warp(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + ns);
 666         qtest_send_prefix(chr);
 667         qtest_sendf(chr, "OK %"PRIi64"\n",
 668                     (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 669     } else if (strcmp(words[0], "module_load") == 0) {
 670         g_assert(words[1] && words[2]);
 671
 672         qtest_send_prefix(chr);
 673         if (module_load_one(words[1], words[2])) {
 674             qtest_sendf(chr, "OK\n");
 675         } else {
 676             qtest_sendf(chr, "FAIL\n");
 677         }
 678     } else if (qtest_enabled() && strcmp(words[0], "clock_set") == 0) {
 679         int64_t ns;
 680         int ret;
 681
 682         g_assert(words[1]);
 683         ret = qemu_strtoi64(words[1], NULL, 0, &ns);
 684         g_assert(ret == 0);
 685         qtest_clock_warp(ns);
 686         qtest_send_prefix(chr);
 687         qtest_sendf(chr, "OK %"PRIi64"\n",
 688                     (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 689     } else {
 690         qtest_send_prefix(chr);
 691         qtest_sendf(chr, "FAIL Unknown command '%s'\n", words[0]);
 692     }
 693 }
 694
 695 static void qtest_process_inbuf(CharBackend *chr, GString *inbuf)
 696 {
 697     char *end;
 698
 699     while ((end = strchr(inbuf->str, '\n')) != NULL) {
 700         size_t offset;
 701         GString *cmd;
 702         gchar **words;
 703
 704         offset = end - inbuf->str;
 705
 706         cmd = g_string_new_len(inbuf->str, offset);
 707         g_string_erase(inbuf, 0, offset + 1);
 708
 709         words = g_strsplit(cmd->str, " ", 0);
 710         qtest_process_command(chr, words);
 711         g_strfreev(words);
 712
 713         g_string_free(cmd, TRUE);
 714     }
 715 }
 716
 717 static void qtest_read(void *opaque, const uint8_t *buf, int size)
 718 {
 719     CharBackend *chr = opaque;
 720
 721     g_string_append_len(inbuf, (const gchar *)buf, size);
 722     qtest_process_inbuf(chr, inbuf);
 723 }
 724
 725 static int qtest_can_read(void *opaque)
 726 {
 727     return 1024;
 728 }
 729
 730 static void qtest_event(void *opaque, QEMUChrEvent event)
 731 {
 732     int i;
 733
 734     switch (event) {
 735     case CHR_EVENT_OPENED:
 736         /*
 737          * We used to call qemu_system_reset() here, hoping we could
 738          * use the same process for multiple tests that way.  Never
 739          * used.  Injects an extra reset even when it's not used, and
 740          * that can mess up tests, e.g. -boot once.
 741          */
 742         for (i = 0; i < ARRAY_SIZE(irq_levels); i++) {
 743             irq_levels[i] = 0;
 744         }
 745         qemu_gettimeofday(&start_time);
 746         qtest_opened = true;
 747         if (qtest_log_fp) {
 748             fprintf(qtest_log_fp, "[I " FMT_timeval "] OPENED\n",
 749                     (long) start_time.tv_sec, (long) start_time.tv_usec);
 750         }
 751         break;
 752     case CHR_EVENT_CLOSED:
 753         qtest_opened = false;
 754         if (qtest_log_fp) {
 755             qemu_timeval tv;
 756             qtest_get_time(&tv);
 757             fprintf(qtest_log_fp, "[I +" FMT_timeval "] CLOSED\n",
 758                     (long) tv.tv_sec, (long) tv.tv_usec);
 759         }
 760         break;
 761     default:
 762         break;
 763     }
 764 }
 765 void qtest_server_init(const char *qtest_chrdev, const char *qtest_log, Error **errp)
 766 {
 767     Chardev *chr;
 768
 769     chr = qemu_chr_new("qtest", qtest_chrdev, NULL);
 770
 771     if (chr == NULL) {
 772         error_setg(errp, "Failed to initialize device for qtest: \"%s\"",
 773                    qtest_chrdev);
 774         return;
 775     }
 776
 777     if (qtest_log) {
 778         if (strcmp(qtest_log, "none") != 0) {
 779             qtest_log_fp = fopen(qtest_log, "w+");
 780         }
 781     } else {
 782         qtest_log_fp = stderr;
 783     }
 784
 785     qemu_chr_fe_init(&qtest_chr, chr, errp);
 786     qemu_chr_fe_set_handlers(&qtest_chr, qtest_can_read, qtest_read,
 787                              qtest_event, NULL, &qtest_chr, NULL, true);
 788     qemu_chr_fe_set_echo(&qtest_chr, true);
 789
 790     inbuf = g_string_new("");
 791
 792     if (!qtest_server_send) {
 793         qtest_server_set_send_handler(qtest_server_char_be_send, &qtest_chr);
 794     }
 795 }
 796
 797 void qtest_server_set_send_handler(void (*send)(void*, const char*),
 798                                    void *opaque)
 799 {
 800     qtest_server_send = send;
 801     qtest_server_send_opaque = opaque;
 802 }
 803
 804 bool qtest_driver(void)
 805 {
 806     return qtest_chr.chr != NULL;
 807 }
 808
 809 void qtest_server_inproc_recv(void *dummy, const char *buf)
 810 {
 811     static GString *gstr;
 812     if (!gstr) {
 813         gstr = g_string_new(NULL);
 814     }
 815     g_string_append(gstr, buf);
 816     if (gstr->str[gstr->len - 1] == '\n') {
 817         qtest_process_inbuf(NULL, gstr);
 818         g_string_truncate(gstr, 0);
 819     }
 820 }