savevm.c 62.4 KB
Newer Older
aliguori's avatar
aliguori committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

blueswir1's avatar
blueswir1 committed
25
#include "config-host.h"
26 27
#include "qemu-common.h"
#include "hw/hw.h"
28
#include "hw/qdev.h"
Paolo Bonzini's avatar
Paolo Bonzini committed
29
#include "net/net.h"
30
#include "monitor/monitor.h"
31
#include "sysemu/sysemu.h"
32
#include "qemu/timer.h"
33
#include "audio/audio.h"
34
#include "migration/migration.h"
35 36
#include "qemu/sockets.h"
#include "qemu/queue.h"
37
#include "sysemu/cpus.h"
38
#include "exec/memory.h"
39
#include "qmp-commands.h"
40
#include "trace.h"
41
#include "qemu/bitops.h"
42
#include "qemu/iov.h"
43

aliguori's avatar
aliguori committed
44 45
#define SELF_ANNOUNCE_ROUNDS 5

Nolan's avatar
Nolan committed
46
#ifndef ETH_P_RARP
Stefan Berger's avatar
Stefan Berger committed
47
#define ETH_P_RARP 0x8035
Nolan's avatar
Nolan committed
48 49 50 51 52 53
#endif
#define ARP_HTYPE_ETH 0x0001
#define ARP_PTYPE_IP 0x0800
#define ARP_OP_REQUEST_REV 0x3

static int announce_self_create(uint8_t *buf,
aliguori's avatar
aliguori committed
54 55
				uint8_t *mac_addr)
{
Nolan's avatar
Nolan committed
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
    /* Ethernet header. */
    memset(buf, 0xff, 6);         /* destination MAC addr */
    memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
    *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */

    /* RARP header. */
    *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
    *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
    *(buf + 18) = 6; /* hardware addr length (ethernet) */
    *(buf + 19) = 4; /* protocol addr length (IPv4) */
    *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
    memcpy(buf + 22, mac_addr, 6); /* source hw addr */
    memset(buf + 28, 0x00, 4);     /* source protocol addr */
    memcpy(buf + 32, mac_addr, 6); /* target hw addr */
    memset(buf + 38, 0x00, 4);     /* target protocol addr */

    /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
    memset(buf + 42, 0x00, 18);

    return 60; /* len (FCS will be added by hardware) */
aliguori's avatar
aliguori committed
76 77
}

78
static void qemu_announce_self_iter(NICState *nic, void *opaque)
aliguori's avatar
aliguori committed
79
{
Nolan's avatar
Nolan committed
80
    uint8_t buf[60];
81 82 83 84
    int len;

    len = announce_self_create(buf, nic->conf->macaddr.a);

Jason Wang's avatar
Jason Wang committed
85
    qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
86 87 88 89 90
}


static void qemu_announce_self_once(void *opaque)
{
91 92
    static int count = SELF_ANNOUNCE_ROUNDS;
    QEMUTimer *timer = *(QEMUTimer **)opaque;
aliguori's avatar
aliguori committed
93

94 95
    qemu_foreach_nic(qemu_announce_self_iter, NULL);

Nolan's avatar
Nolan committed
96 97
    if (--count) {
        /* delay 50ms, 150ms, 250ms, ... */
98
        qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
Nolan's avatar
Nolan committed
99
                       50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
100 101 102 103 104 105 106 107 108
    } else {
	    qemu_del_timer(timer);
	    qemu_free_timer(timer);
    }
}

void qemu_announce_self(void)
{
	static QEMUTimer *timer;
109
	timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
110
	qemu_announce_self_once(&timer);
aliguori's avatar
aliguori committed
111 112 113 114 115 116
}

/***********************************************************/
/* savevm/loadvm support */

#define IO_BUF_SIZE 32768
117
#define MAX_IOV_SIZE MIN(IOV_MAX, 64)
aliguori's avatar
aliguori committed
118 119

struct QEMUFile {
120
    const QEMUFileOps *ops;
aliguori's avatar
aliguori committed
121 122
    void *opaque;

123 124 125
    int64_t bytes_xfer;
    int64_t xfer_limit;

126 127
    int64_t pos; /* start of buffer when writing, end of buffer
                    when reading */
aliguori's avatar
aliguori committed
128 129 130 131
    int buf_index;
    int buf_size; /* 0 when writing */
    uint8_t buf[IO_BUF_SIZE];

132 133 134
    struct iovec iov[MAX_IOV_SIZE];
    unsigned int iovcnt;

135
    int last_error;
aliguori's avatar
aliguori committed
136 137
};

138
typedef struct QEMUFileStdio
aliguori's avatar
aliguori committed
139
{
140
    FILE *stdio_file;
aliguori's avatar
aliguori committed
141
    QEMUFile *file;
142
} QEMUFileStdio;
aliguori's avatar
aliguori committed
143 144 145 146 147 148 149

typedef struct QEMUFileSocket
{
    int fd;
    QEMUFile *file;
} QEMUFileSocket;

150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177
typedef struct {
    Coroutine *co;
    int fd;
} FDYieldUntilData;

static void fd_coroutine_enter(void *opaque)
{
    FDYieldUntilData *data = opaque;
    qemu_set_fd_handler(data->fd, NULL, NULL, NULL);
    qemu_coroutine_enter(data->co, NULL);
}

/**
 * Yield until a file descriptor becomes readable
 *
 * Note that this function clobbers the handlers for the file descriptor.
 */
static void coroutine_fn yield_until_fd_readable(int fd)
{
    FDYieldUntilData data;

    assert(qemu_in_coroutine());
    data.co = qemu_coroutine_self();
    data.fd = fd;
    qemu_set_fd_handler(fd, fd_coroutine_enter, NULL, &data);
    qemu_coroutine_yield();
}

178 179 180 181 182 183 184 185 186 187 188 189 190
static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt)
{
    QEMUFileSocket *s = opaque;
    ssize_t len;
    ssize_t size = iov_size(iov, iovcnt);

    len = iov_send(s->fd, iov, iovcnt, 0, size);
    if (len < size) {
        len = -socket_error();
    }
    return len;
}

Paolo Bonzini's avatar
Paolo Bonzini committed
191 192 193 194 195 196 197
static int socket_get_fd(void *opaque)
{
    QEMUFileSocket *s = opaque;

    return s->fd;
}

aliguori's avatar
aliguori committed
198 199 200 201 202
static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
{
    QEMUFileSocket *s = opaque;
    ssize_t len;

203
    for (;;) {
Blue Swirl's avatar
Blue Swirl committed
204
        len = qemu_recv(s->fd, buf, size, 0);
205 206 207 208
        if (len != -1) {
            break;
        }
        if (socket_error() == EAGAIN) {
209
            yield_until_fd_readable(s->fd);
210 211 212 213
        } else if (socket_error() != EINTR) {
            break;
        }
    }
aliguori's avatar
aliguori committed
214

215
    if (len == -1) {
aliguori's avatar
aliguori committed
216
        len = -socket_error();
217
    }
aliguori's avatar
aliguori committed
218 219 220
    return len;
}

221 222 223 224 225 226 227 228 229 230 231 232
static int socket_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
{
    QEMUFileSocket *s = opaque;
    ssize_t len;

    len = qemu_send_full(s->fd, buf, size, 0);
    if (len < size) {
        len = -socket_error();
    }
    return len;
}

aliguori's avatar
aliguori committed
233 234 235
static int socket_close(void *opaque)
{
    QEMUFileSocket *s = opaque;
236
    closesocket(s->fd);
237
    g_free(s);
aliguori's avatar
aliguori committed
238 239 240
    return 0;
}

Paolo Bonzini's avatar
Paolo Bonzini committed
241 242 243 244 245 246 247
static int stdio_get_fd(void *opaque)
{
    QEMUFileStdio *s = opaque;

    return fileno(s->stdio_file);
}

248
static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
aliguori's avatar
aliguori committed
249
{
250 251
    QEMUFileStdio *s = opaque;
    return fwrite(buf, 1, size, s->stdio_file);
aliguori's avatar
aliguori committed
252 253
}

254
static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
aliguori's avatar
aliguori committed
255
{
256 257
    QEMUFileStdio *s = opaque;
    FILE *fp = s->stdio_file;
258 259
    int bytes;

260
    for (;;) {
261 262
        clearerr(fp);
        bytes = fread(buf, 1, size, fp);
263 264 265 266
        if (bytes != 0 || !ferror(fp)) {
            break;
        }
        if (errno == EAGAIN) {
267
            yield_until_fd_readable(fileno(fp));
268 269 270 271
        } else if (errno != EINTR) {
            break;
        }
    }
272
    return bytes;
aliguori's avatar
aliguori committed
273 274
}

275 276 277
static int stdio_pclose(void *opaque)
{
    QEMUFileStdio *s = opaque;
278 279
    int ret;
    ret = pclose(s->stdio_file);
280 281
    if (ret == -1) {
        ret = -errno;
282 283 284
    } else if (!WIFEXITED(ret) || WEXITSTATUS(ret) != 0) {
        /* close succeeded, but non-zero exit code: */
        ret = -EIO; /* fake errno value */
285
    }
286
    g_free(s);
287
    return ret;
288 289 290
}

static int stdio_fclose(void *opaque)
aliguori's avatar
aliguori committed
291
{
292
    QEMUFileStdio *s = opaque;
293
    int ret = 0;
294

Orit Wasserman's avatar
Orit Wasserman committed
295
    if (s->file->ops->put_buffer || s->file->ops->writev_buffer) {
296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
        int fd = fileno(s->stdio_file);
        struct stat st;

        ret = fstat(fd, &st);
        if (ret == 0 && S_ISREG(st.st_mode)) {
            /*
             * If the file handle is a regular file make sure the
             * data is flushed to disk before signaling success.
             */
            ret = fsync(fd);
            if (ret != 0) {
                ret = -errno;
                return ret;
            }
        }
    }
312 313 314
    if (fclose(s->stdio_file) == EOF) {
        ret = -errno;
    }
315
    g_free(s);
316
    return ret;
aliguori's avatar
aliguori committed
317 318
}

319
static const QEMUFileOps stdio_pipe_read_ops = {
Paolo Bonzini's avatar
Paolo Bonzini committed
320
    .get_fd =     stdio_get_fd,
321 322 323 324 325
    .get_buffer = stdio_get_buffer,
    .close =      stdio_pclose
};

static const QEMUFileOps stdio_pipe_write_ops = {
Paolo Bonzini's avatar
Paolo Bonzini committed
326
    .get_fd =     stdio_get_fd,
327 328 329 330
    .put_buffer = stdio_put_buffer,
    .close =      stdio_pclose
};

331
QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
aliguori's avatar
aliguori committed
332
{
333
    FILE *stdio_file;
334
    QEMUFileStdio *s;
aliguori's avatar
aliguori committed
335

336 337 338 339 340 341
    stdio_file = popen(command, mode);
    if (stdio_file == NULL) {
        return NULL;
    }

    if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
aliguori's avatar
aliguori committed
342 343 344 345
        fprintf(stderr, "qemu_popen: Argument validity check failed\n");
        return NULL;
    }

346
    s = g_malloc0(sizeof(QEMUFileStdio));
aliguori's avatar
aliguori committed
347

348
    s->stdio_file = stdio_file;
aliguori's avatar
aliguori committed
349 350

    if(mode[0] == 'r') {
351
        s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
aliguori's avatar
aliguori committed
352
    } else {
353
        s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
aliguori's avatar
aliguori committed
354 355 356 357
    }
    return s->file;
}

358
static const QEMUFileOps stdio_file_read_ops = {
Paolo Bonzini's avatar
Paolo Bonzini committed
359
    .get_fd =     stdio_get_fd,
360 361 362 363 364
    .get_buffer = stdio_get_buffer,
    .close =      stdio_fclose
};

static const QEMUFileOps stdio_file_write_ops = {
Paolo Bonzini's avatar
Paolo Bonzini committed
365
    .get_fd =     stdio_get_fd,
366 367 368 369
    .put_buffer = stdio_put_buffer,
    .close =      stdio_fclose
};

Paolo Bonzini's avatar
Paolo Bonzini committed
370 371 372 373 374 375 376 377 378 379 380
QEMUFile *qemu_fdopen(int fd, const char *mode)
{
    QEMUFileStdio *s;

    if (mode == NULL ||
	(mode[0] != 'r' && mode[0] != 'w') ||
	mode[1] != 'b' || mode[2] != 0) {
        fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
        return NULL;
    }

381
    s = g_malloc0(sizeof(QEMUFileStdio));
Paolo Bonzini's avatar
Paolo Bonzini committed
382 383 384 385 386
    s->stdio_file = fdopen(fd, mode);
    if (!s->stdio_file)
        goto fail;

    if(mode[0] == 'r') {
387
        s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
Paolo Bonzini's avatar
Paolo Bonzini committed
388
    } else {
389
        s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
Paolo Bonzini's avatar
Paolo Bonzini committed
390 391 392 393
    }
    return s->file;

fail:
394
    g_free(s);
Paolo Bonzini's avatar
Paolo Bonzini committed
395 396 397
    return NULL;
}

398
static const QEMUFileOps socket_read_ops = {
Paolo Bonzini's avatar
Paolo Bonzini committed
399
    .get_fd =     socket_get_fd,
400 401 402 403
    .get_buffer = socket_get_buffer,
    .close =      socket_close
};

404 405 406
static const QEMUFileOps socket_write_ops = {
    .get_fd =     socket_get_fd,
    .put_buffer = socket_put_buffer,
407
    .writev_buffer = socket_writev_buffer,
408 409 410 411
    .close =      socket_close
};

QEMUFile *qemu_fopen_socket(int fd, const char *mode)
aliguori's avatar
aliguori committed
412
{
413
    QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
aliguori's avatar
aliguori committed
414

415 416 417 418 419 420 421
    if (mode == NULL ||
        (mode[0] != 'r' && mode[0] != 'w') ||
        mode[1] != 'b' || mode[2] != 0) {
        fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
        return NULL;
    }

aliguori's avatar
aliguori committed
422
    s->fd = fd;
423
    if (mode[0] == 'w') {
424
        qemu_set_block(s->fd);
425 426 427 428
        s->file = qemu_fopen_ops(s, &socket_write_ops);
    } else {
        s->file = qemu_fopen_ops(s, &socket_read_ops);
    }
aliguori's avatar
aliguori committed
429 430 431 432 433 434 435
    return s->file;
}

QEMUFile *qemu_fopen(const char *filename, const char *mode)
{
    QEMUFileStdio *s;

436 437 438
    if (mode == NULL ||
	(mode[0] != 'r' && mode[0] != 'w') ||
	mode[1] != 'b' || mode[2] != 0) {
Blue Swirl's avatar
Blue Swirl committed
439
        fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
440 441 442
        return NULL;
    }

443
    s = g_malloc0(sizeof(QEMUFileStdio));
aliguori's avatar
aliguori committed
444

445 446
    s->stdio_file = fopen(filename, mode);
    if (!s->stdio_file)
aliguori's avatar
aliguori committed
447
        goto fail;
lirans@il.ibm.com's avatar
lirans@il.ibm.com committed
448
    
449
    if(mode[0] == 'w') {
450
        s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
451
    } else {
452
        s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
453 454
    }
    return s->file;
aliguori's avatar
aliguori committed
455
fail:
456
    g_free(s);
aliguori's avatar
aliguori committed
457 458 459
    return NULL;
}

460
static int block_put_buffer(void *opaque, const uint8_t *buf,
aliguori's avatar
aliguori committed
461 462
                           int64_t pos, int size)
{
463
    bdrv_save_vmstate(opaque, buf, pos, size);
aliguori's avatar
aliguori committed
464 465 466
    return size;
}

467
static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
aliguori's avatar
aliguori committed
468
{
469
    return bdrv_load_vmstate(opaque, buf, pos, size);
aliguori's avatar
aliguori committed
470 471 472 473
}

static int bdrv_fclose(void *opaque)
{
474
    return bdrv_flush(opaque);
aliguori's avatar
aliguori committed
475 476
}

477 478 479 480 481 482 483 484 485 486
static const QEMUFileOps bdrv_read_ops = {
    .get_buffer = block_get_buffer,
    .close =      bdrv_fclose
};

static const QEMUFileOps bdrv_write_ops = {
    .put_buffer = block_put_buffer,
    .close =      bdrv_fclose
};

487
static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
aliguori's avatar
aliguori committed
488 489
{
    if (is_writable)
490 491
        return qemu_fopen_ops(bs, &bdrv_write_ops);
    return qemu_fopen_ops(bs, &bdrv_read_ops);
aliguori's avatar
aliguori committed
492 493
}

494
QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
aliguori's avatar
aliguori committed
495 496 497
{
    QEMUFile *f;

498
    f = g_malloc0(sizeof(QEMUFile));
aliguori's avatar
aliguori committed
499 500

    f->opaque = opaque;
501
    f->ops = ops;
aliguori's avatar
aliguori committed
502 503 504
    return f;
}

505
int qemu_file_get_error(QEMUFile *f)
aliguori's avatar
aliguori committed
506
{
507
    return f->last_error;
aliguori's avatar
aliguori committed
508 509
}

510
static void qemu_file_set_error(QEMUFile *f, int ret)
511
{
512 513 514
    if (f->last_error == 0) {
        f->last_error = ret;
    }
515 516
}

517 518 519 520 521
static inline bool qemu_file_is_writable(QEMUFile *f)
{
    return f->ops->writev_buffer || f->ops->put_buffer;
}

Orit Wasserman's avatar
Orit Wasserman committed
522 523
/**
 * Flushes QEMUFile buffer
524
 *
Orit Wasserman's avatar
Orit Wasserman committed
525 526
 * If there is writev_buffer QEMUFileOps it uses it otherwise uses
 * put_buffer ops.
527
 */
528
static void qemu_fflush(QEMUFile *f)
aliguori's avatar
aliguori committed
529
{
Orit Wasserman's avatar
Orit Wasserman committed
530
    ssize_t ret = 0;
531

532
    if (!qemu_file_is_writable(f)) {
533 534
        return;
    }
Orit Wasserman's avatar
Orit Wasserman committed
535

536 537 538
    if (f->ops->writev_buffer) {
        if (f->iovcnt > 0) {
            ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt);
539
        }
540 541 542
    } else {
        if (f->buf_index > 0) {
            ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index);
543
        }
aliguori's avatar
aliguori committed
544
    }
545 546 547 548 549
    if (ret >= 0) {
        f->pos += ret;
    }
    f->buf_index = 0;
    f->iovcnt = 0;
550 551 552
    if (ret < 0) {
        qemu_file_set_error(f, ret);
    }
aliguori's avatar
aliguori committed
553 554 555 556 557
}

static void qemu_fill_buffer(QEMUFile *f)
{
    int len;
558
    int pending;
aliguori's avatar
aliguori committed
559

560
    assert(!qemu_file_is_writable(f));
aliguori's avatar
aliguori committed
561

562 563 564 565 566 567 568
    pending = f->buf_size - f->buf_index;
    if (pending > 0) {
        memmove(f->buf, f->buf + f->buf_index, pending);
    }
    f->buf_index = 0;
    f->buf_size = pending;

569
    len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
570
                        IO_BUF_SIZE - pending);
aliguori's avatar
aliguori committed
571
    if (len > 0) {
572
        f->buf_size += len;
573
        f->pos += len;
574
    } else if (len == 0) {
575
        qemu_file_set_error(f, -EIO);
aliguori's avatar
aliguori committed
576
    } else if (len != -EAGAIN)
577
        qemu_file_set_error(f, len);
aliguori's avatar
aliguori committed
578 579
}

Paolo Bonzini's avatar
Paolo Bonzini committed
580 581 582 583 584 585 586 587
int qemu_get_fd(QEMUFile *f)
{
    if (f->ops->get_fd) {
        return f->ops->get_fd(f->opaque);
    }
    return -1;
}

588 589 590 591 592 593 594 595 596 597
/** Closes the file
 *
 * Returns negative error value if any error happened on previous operations or
 * while closing the file. Returns 0 or positive number on success.
 *
 * The meaning of return value on success depends on the specific backend
 * being used.
 */
int qemu_fclose(QEMUFile *f)
{
598
    int ret;
599 600
    qemu_fflush(f);
    ret = qemu_file_get_error(f);
601

602 603
    if (f->ops->close) {
        int ret2 = f->ops->close(f->opaque);
604 605 606
        if (ret >= 0) {
            ret = ret2;
        }
607
    }
608 609 610 611 612 613
    /* If any error was spotted before closing, we should report it
     * instead of the close() return value.
     */
    if (f->last_error) {
        ret = f->last_error;
    }
614
    g_free(f);
aliguori's avatar
aliguori committed
615 616 617
    return ret;
}

618 619 620 621 622 623 624 625 626 627
static void add_to_iovec(QEMUFile *f, const uint8_t *buf, int size)
{
    /* check for adjacent buffer and coalesce them */
    if (f->iovcnt > 0 && buf == f->iov[f->iovcnt - 1].iov_base +
        f->iov[f->iovcnt - 1].iov_len) {
        f->iov[f->iovcnt - 1].iov_len += size;
    } else {
        f->iov[f->iovcnt].iov_base = (uint8_t *)buf;
        f->iov[f->iovcnt++].iov_len = size;
    }
628 629 630 631

    if (f->buf_index >= IO_BUF_SIZE || f->iovcnt >= MAX_IOV_SIZE) {
        qemu_fflush(f);
    }
632 633
}

Orit Wasserman's avatar
Orit Wasserman committed
634 635
void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size)
{
636 637 638 639 640
    if (!f->ops->writev_buffer) {
        qemu_put_buffer(f, buf, size);
        return;
    }

Orit Wasserman's avatar
Orit Wasserman committed
641 642 643 644 645
    if (f->last_error) {
        return;
    }

    f->bytes_xfer += size;
646
    add_to_iovec(f, buf, size);
Orit Wasserman's avatar
Orit Wasserman committed
647 648
}

aliguori's avatar
aliguori committed
649 650 651 652
void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
{
    int l;

653 654 655 656 657
    if (f->last_error) {
        return;
    }

    while (size > 0) {
aliguori's avatar
aliguori committed
658 659 660 661
        l = IO_BUF_SIZE - f->buf_index;
        if (l > size)
            l = size;
        memcpy(f->buf + f->buf_index, buf, l);
662 663 664 665 666 667 668 669 670 671
        f->bytes_xfer += size;
        if (f->ops->writev_buffer) {
            add_to_iovec(f, f->buf + f->buf_index, l);
            f->buf_index += l;
        } else {
            f->buf_index += l;
            if (f->buf_index == IO_BUF_SIZE) {
                qemu_fflush(f);
            }
        }
Orit Wasserman's avatar
Orit Wasserman committed
672 673 674
        if (qemu_file_get_error(f)) {
            break;
        }
aliguori's avatar
aliguori committed
675 676 677 678 679 680 681
        buf += l;
        size -= l;
    }
}

void qemu_put_byte(QEMUFile *f, int v)
{
682 683 684 685
    if (f->last_error) {
        return;
    }

686
    f->buf[f->buf_index] = v;
687
    f->bytes_xfer++;
688 689 690 691 692 693 694 695 696
    if (f->ops->writev_buffer) {
        add_to_iovec(f, f->buf + f->buf_index, 1);
        f->buf_index++;
    } else {
        f->buf_index++;
        if (f->buf_index == IO_BUF_SIZE) {
            qemu_fflush(f);
        }
    }
aliguori's avatar
aliguori committed
697 698
}

699
static void qemu_file_skip(QEMUFile *f, int size)
aliguori's avatar
aliguori committed
700
{
701 702 703 704 705 706
    if (f->buf_index + size <= f->buf_size) {
        f->buf_index += size;
    }
}

static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
aliguori's avatar
aliguori committed
707
{
708 709
    int pending;
    int index;
aliguori's avatar
aliguori committed
710

711
    assert(!qemu_file_is_writable(f));
aliguori's avatar
aliguori committed
712

713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742
    index = f->buf_index + offset;
    pending = f->buf_size - index;
    if (pending < size) {
        qemu_fill_buffer(f);
        index = f->buf_index + offset;
        pending = f->buf_size - index;
    }

    if (pending <= 0) {
        return 0;
    }
    if (size > pending) {
        size = pending;
    }

    memcpy(buf, f->buf + index, size);
    return size;
}

int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
{
    int pending = size;
    int done = 0;

    while (pending > 0) {
        int res;

        res = qemu_peek_buffer(f, buf, pending, 0);
        if (res == 0) {
            return done;
aliguori's avatar
aliguori committed
743
        }
744 745 746 747
        qemu_file_skip(f, res);
        buf += res;
        pending -= res;
        done += res;
aliguori's avatar
aliguori committed
748
    }
749
    return done;
aliguori's avatar
aliguori committed
750 751
}

752
static int qemu_peek_byte(QEMUFile *f, int offset)
Juan Quintela's avatar
Juan Quintela committed
753
{
754 755
    int index = f->buf_index + offset;

756
    assert(!qemu_file_is_writable(f));
Juan Quintela's avatar
Juan Quintela committed
757

758
    if (index >= f->buf_size) {
Juan Quintela's avatar
Juan Quintela committed
759
        qemu_fill_buffer(f);
760 761
        index = f->buf_index + offset;
        if (index >= f->buf_size) {
Juan Quintela's avatar
Juan Quintela committed
762
            return 0;
763
        }
Juan Quintela's avatar
Juan Quintela committed
764
    }
765
    return f->buf[index];
Juan Quintela's avatar
Juan Quintela committed
766 767
}

aliguori's avatar
aliguori committed
768 769
int qemu_get_byte(QEMUFile *f)
{
770
    int result;
aliguori's avatar
aliguori committed
771

772 773
    result = qemu_peek_byte(f, 0);
    qemu_file_skip(f, 1);
774
    return result;
aliguori's avatar
aliguori committed
775 776
}

777
int64_t qemu_ftell(QEMUFile *f)
aliguori's avatar
aliguori committed
778
{
779 780
    qemu_fflush(f);
    return f->pos;
aliguori's avatar
aliguori committed
781 782 783 784
}

int qemu_file_rate_limit(QEMUFile *f)
{
785 786 787 788 789 790
    if (qemu_file_get_error(f)) {
        return 1;
    }
    if (f->xfer_limit > 0 && f->bytes_xfer > f->xfer_limit) {
        return 1;
    }
aliguori's avatar
aliguori committed
791 792 793
    return 0;
}

794
int64_t qemu_file_get_rate_limit(QEMUFile *f)
lirans@il.ibm.com's avatar
lirans@il.ibm.com committed
795
{
796
    return f->xfer_limit;
lirans@il.ibm.com's avatar
lirans@il.ibm.com committed
797 798
}

799
void qemu_file_set_rate_limit(QEMUFile *f, int64_t limit)
800
{
801 802
    f->xfer_limit = limit;
}
803

804 805 806
void qemu_file_reset_rate_limit(QEMUFile *f)
{
    f->bytes_xfer = 0;
807 808
}

aliguori's avatar
aliguori committed
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
void qemu_put_be16(QEMUFile *f, unsigned int v)
{
    qemu_put_byte(f, v >> 8);
    qemu_put_byte(f, v);
}

void qemu_put_be32(QEMUFile *f, unsigned int v)
{
    qemu_put_byte(f, v >> 24);
    qemu_put_byte(f, v >> 16);
    qemu_put_byte(f, v >> 8);
    qemu_put_byte(f, v);
}

void qemu_put_be64(QEMUFile *f, uint64_t v)
{
    qemu_put_be32(f, v >> 32);
    qemu_put_be32(f, v);
}

unsigned int qemu_get_be16(QEMUFile *f)
{
    unsigned int v;
    v = qemu_get_byte(f) << 8;
    v |= qemu_get_byte(f);
    return v;
}

unsigned int qemu_get_be32(QEMUFile *f)
{
    unsigned int v;
    v = qemu_get_byte(f) << 24;
    v |= qemu_get_byte(f) << 16;
    v |= qemu_get_byte(f) << 8;
    v |= qemu_get_byte(f);
    return v;
}

uint64_t qemu_get_be64(QEMUFile *f)
{
    uint64_t v;
    v = (uint64_t)qemu_get_be32(f) << 32;
    v |= qemu_get_be32(f);
    return v;
}

855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878

/* timer */

void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
{
    uint64_t expire_time;

    expire_time = qemu_timer_expire_time_ns(ts);
    qemu_put_be64(f, expire_time);
}

void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
{
    uint64_t expire_time;

    expire_time = qemu_get_be64(f);
    if (expire_time != -1) {
        qemu_mod_timer_ns(ts, expire_time);
    } else {
        qemu_del_timer(ts);
    }
}


Gerd Hoffmann's avatar
Gerd Hoffmann committed
879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899
/* bool */

static int get_bool(QEMUFile *f, void *pv, size_t size)
{
    bool *v = pv;
    *v = qemu_get_byte(f);
    return 0;
}

static void put_bool(QEMUFile *f, void *pv, size_t size)
{
    bool *v = pv;
    qemu_put_byte(f, *v);
}

const VMStateInfo vmstate_info_bool = {
    .name = "bool",
    .get  = get_bool,
    .put  = put_bool,
};

900 901 902 903 904 905 906 907 908
/* 8 bit int */

static int get_int8(QEMUFile *f, void *pv, size_t size)
{
    int8_t *v = pv;
    qemu_get_s8s(f, v);
    return 0;
}

909
static void put_int8(QEMUFile *f, void *pv, size_t size)
910
{
911
    int8_t *v = pv;
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
    qemu_put_s8s(f, v);
}

const VMStateInfo vmstate_info_int8 = {
    .name = "int8",
    .get  = get_int8,
    .put  = put_int8,
};

/* 16 bit int */

static int get_int16(QEMUFile *f, void *pv, size_t size)
{
    int16_t *v = pv;
    qemu_get_sbe16s(f, v);
    return 0;
}

930
static void put_int16(QEMUFile *f, void *pv, size_t size)
931
{
932
    int16_t *v = pv;
933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
    qemu_put_sbe16s(f, v);
}

const VMStateInfo vmstate_info_int16 = {
    .name = "int16",
    .get  = get_int16,
    .put  = put_int16,
};

/* 32 bit int */

static int get_int32(QEMUFile *f, void *pv, size_t size)
{
    int32_t *v = pv;
    qemu_get_sbe32s(f, v);
    return 0;
}

951
static void put_int32(QEMUFile *f, void *pv, size_t size)
952
{
953
    int32_t *v = pv;
954 955 956 957 958 959 960 961 962
    qemu_put_sbe32s(f, v);
}

const VMStateInfo vmstate_info_int32 = {
    .name = "int32",
    .get  = get_int32,
    .put  = put_int32,
};

963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982
/* 32 bit int. See that the received value is the same than the one
   in the field */

static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
{
    int32_t *v = pv;
    int32_t v2;
    qemu_get_sbe32s(f, &v2);

    if (*v == v2)
        return 0;
    return -EINVAL;
}

const VMStateInfo vmstate_info_int32_equal = {
    .name = "int32 equal",
    .get  = get_int32_equal,
    .put  = put_int32,
};

983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
/* 32 bit int. See that the received value is the less or the same
   than the one in the field */

static int get_int32_le(QEMUFile *f, void *pv, size_t size)
{
    int32_t *old = pv;
    int32_t new;
    qemu_get_sbe32s(f, &new);

    if (*old <= new)
        return 0;
    return -EINVAL;
}

const VMStateInfo vmstate_info_int32_le = {
    .name = "int32 equal",
    .get  = get_int32_le,
    .put  = put_int32,
};

1003 1004 1005 1006 1007 1008 1009 1010 1011
/* 64 bit int */

static int get_int64(QEMUFile *f, void *pv, size_t size)
{
    int64_t *v = pv;
    qemu_get_sbe64s(f, v);
    return 0;
}

1012
static void put_int64(QEMUFile *f, void *pv, size_t size)
1013
{
1014
    int64_t *v = pv;
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
    qemu_put_sbe64s(f, v);
}

const VMStateInfo vmstate_info_int64 = {
    .name = "int64",
    .get  = get_int64,
    .put  = put_int64,
};

/* 8 bit unsigned int */

static int get_uint8(QEMUFile *f, void *pv, size_t size)
{
    uint8_t *v = pv;
    qemu_get_8s(f, v);
    return 0;
}

1033
static void put_uint8(QEMUFile *f, void *pv, size_t size)
1034
{
1035
    uint8_t *v = pv;
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
    qemu_put_8s(f, v);
}

const VMStateInfo vmstate_info_uint8 = {
    .name = "uint8",
    .get  = get_uint8,
    .put  = put_uint8,
};

/* 16 bit unsigned int */

static int get_uint16(QEMUFile *f, void *pv, size_t size)
{
    uint16_t *v = pv;
    qemu_get_be16s(f, v);
    return 0;
}