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