Archipelago » qemu

/*

 * 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.

 */

#include <unistd.h>

#include <fcntl.h>

#include <time.h>

#include <errno.h>

#include <sys/time.h>

#include <zlib.h>

/* Needed early for CONFIG_BSD etc. */

#include "config-host.h"

#ifndef _WIN32

#include <sys/times.h>

#include <sys/wait.h>

#include <termios.h>

#include <sys/mman.h>

#include <sys/ioctl.h>

#include <sys/resource.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <net/if.h>

#include <arpa/inet.h>

#include <dirent.h>

#include <netdb.h>

#include <sys/select.h>

#ifdef CONFIG_BSD

#include <sys/stat.h>

#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)

#include <libutil.h>

#else

#include <util.h>

#endif

#ifdef __linux__

#include <pty.h>

#include <malloc.h>

#include <linux/rtc.h>

#endif

#endif

#endif

#ifdef _WIN32

#include <windows.h>

#include <malloc.h>

#include <sys/timeb.h>

#include <mmsystem.h>

#define getopt_long_only getopt_long

#define memalign(align, size) malloc(size)

#endif

#include "qemu-common.h"

#include "hw/hw.h"

#include "hw/qdev.h"

#include "net.h"

#include "monitor.h"

#include "sysemu.h"

#include "qemu-timer.h"

#include "qemu-char.h"

#include "audio/audio.h"

#include "migration.h"

#include "qemu_socket.h"

#include "qemu-queue.h"

#include "qemu-timer.h"

#include "cpus.h"

#include "memory.h"

#include "qmp-commands.h"

#include "trace.h"

#define SELF_ANNOUNCE_ROUNDS 5

#ifndef ETH_P_RARP

#define ETH_P_RARP 0x8035

#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,

                                uint8_t *mac_addr)

{

    /* 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) */

}

static void qemu_announce_self_iter(NICState *nic, void *opaque)

{

    uint8_t buf[60];

    int len;

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

    qemu_send_packet_raw(&nic->nc, buf, len);

}

static void qemu_announce_self_once(void *opaque)

{

    static int count = SELF_ANNOUNCE_ROUNDS;

    QEMUTimer *timer = *(QEMUTimer **)opaque;

    qemu_foreach_nic(qemu_announce_self_iter, NULL);

    if (--count) {

        /* delay 50ms, 150ms, 250ms, ... */

        qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +

                       50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);

    } else {

            qemu_del_timer(timer);

            qemu_free_timer(timer);

    }

}

void qemu_announce_self(void)

{

        static QEMUTimer *timer;

        timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);

        qemu_announce_self_once(&timer);

}

/***********************************************************/

/* savevm/loadvm support */

#define IO_BUF_SIZE 32768

struct QEMUFile {

    QEMUFilePutBufferFunc *put_buffer;

    QEMUFileGetBufferFunc *get_buffer;

    QEMUFileCloseFunc *close;

    QEMUFileRateLimit *rate_limit;

    QEMUFileSetRateLimit *set_rate_limit;

    QEMUFileGetRateLimit *get_rate_limit;

    void *opaque;

    int is_write;

    int64_t buf_offset; /* start of buffer when writing, end of buffer

                           when reading */

    int buf_index;

    int buf_size; /* 0 when writing */

    uint8_t buf[IO_BUF_SIZE];

    int last_error;

};

typedef struct QEMUFileStdio

{

    FILE *stdio_file;

    QEMUFile *file;

} QEMUFileStdio;

typedef struct QEMUFileSocket

{

    int fd;

    QEMUFile *file;

} QEMUFileSocket;

static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)

{

    QEMUFileSocket *s = opaque;

    ssize_t len;

    do {

        len = qemu_recv(s->fd, buf, size, 0);

    } while (len == -1 && socket_error() == EINTR);

    if (len == -1)

        len = -socket_error();

    return len;

}

static int socket_close(void *opaque)

{

    QEMUFileSocket *s = opaque;

    g_free(s);

    return 0;

}

static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)

{

    QEMUFileStdio *s = opaque;

    return fwrite(buf, 1, size, s->stdio_file);

}

static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)

{

    QEMUFileStdio *s = opaque;

    FILE *fp = s->stdio_file;

    int bytes;

    do {

        clearerr(fp);

        bytes = fread(buf, 1, size, fp);

    } while ((bytes == 0) && ferror(fp) && (errno == EINTR));

    return bytes;

}

static int stdio_pclose(void *opaque)

{

    QEMUFileStdio *s = opaque;

    int ret;

    ret = pclose(s->stdio_file);

    if (ret == -1) {

        ret = -errno;

    }

    g_free(s);

    return ret;

}

static int stdio_fclose(void *opaque)

{

    QEMUFileStdio *s = opaque;

    int ret = 0;

    if (fclose(s->stdio_file) == EOF) {

        ret = -errno;

    }

    g_free(s);

    return ret;

}

QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)

{

    QEMUFileStdio *s;

    if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {

        fprintf(stderr, "qemu_popen: Argument validity check failed\n");

        return NULL;

    }

    s = g_malloc0(sizeof(QEMUFileStdio));

    s->stdio_file = stdio_file;

    if(mode[0] == 'r') {

        s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, 

                                 NULL, NULL, NULL);

    } else {

        s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, 

                                 NULL, NULL, NULL);

    }

    return s->file;

}

QEMUFile *qemu_popen_cmd(const char *command, const char *mode)

{

    FILE *popen_file;

    popen_file = popen(command, mode);

    if(popen_file == NULL) {

        return NULL;

    }

    return qemu_popen(popen_file, mode);

}

int qemu_stdio_fd(QEMUFile *f)

{

    QEMUFileStdio *p;

    int fd;

    p = (QEMUFileStdio *)f->opaque;

    fd = fileno(p->stdio_file);

    return fd;

}

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;

    }

    s = g_malloc0(sizeof(QEMUFileStdio));

    s->stdio_file = fdopen(fd, mode);

    if (!s->stdio_file)

        goto fail;

    if(mode[0] == 'r') {

        s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, 

                                 NULL, NULL, NULL);

    } else {

        s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, 

                                 NULL, NULL, NULL);

    }

    return s->file;

fail:

    g_free(s);

    return NULL;

}

QEMUFile *qemu_fopen_socket(int fd)

{

    QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));

    s->fd = fd;

    s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, 

                             NULL, NULL, NULL);

    return s->file;

}

static int file_put_buffer(void *opaque, const uint8_t *buf,

                            int64_t pos, int size)

{

    QEMUFileStdio *s = opaque;

    fseek(s->stdio_file, pos, SEEK_SET);

    return fwrite(buf, 1, size, s->stdio_file);

}

static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)

{

    QEMUFileStdio *s = opaque;

    fseek(s->stdio_file, pos, SEEK_SET);

    return fread(buf, 1, size, s->stdio_file);

}

QEMUFile *qemu_fopen(const char *filename, const char *mode)

{

    QEMUFileStdio *s;

    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;

    }

    s = g_malloc0(sizeof(QEMUFileStdio));

    s->stdio_file = fopen(filename, mode);

    if (!s->stdio_file)

        goto fail;

    if(mode[0] == 'w') {

        s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose, 

                                 NULL, NULL, NULL);

    } else {

        s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, 

                               NULL, NULL, NULL);

    }

    return s->file;

fail:

    g_free(s);

    return NULL;

}

static int block_put_buffer(void *opaque, const uint8_t *buf,

                           int64_t pos, int size)

{

    bdrv_save_vmstate(opaque, buf, pos, size);

    return size;

}

static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)

{

    return bdrv_load_vmstate(opaque, buf, pos, size);

}

static int bdrv_fclose(void *opaque)

{

    return bdrv_flush(opaque);

}

static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)

{

    if (is_writable)

        return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, 

                              NULL, NULL, NULL);

    return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);

}

QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,

                         QEMUFileGetBufferFunc *get_buffer,

                         QEMUFileCloseFunc *close,

                         QEMUFileRateLimit *rate_limit,

                         QEMUFileSetRateLimit *set_rate_limit,

                         QEMUFileGetRateLimit *get_rate_limit)

{

    QEMUFile *f;

    f = g_malloc0(sizeof(QEMUFile));

    f->opaque = opaque;

    f->put_buffer = put_buffer;

    f->get_buffer = get_buffer;

    f->close = close;

    f->rate_limit = rate_limit;

    f->set_rate_limit = set_rate_limit;

    f->get_rate_limit = get_rate_limit;

    f->is_write = 0;

    return f;

}

int qemu_file_get_error(QEMUFile *f)

{

    return f->last_error;

}

void qemu_file_set_error(QEMUFile *f, int ret)

{

    f->last_error = ret;

}

/** Sets last_error conditionally

 *

 * Sets last_error only if ret is negative _and_ no error

 * was set before.

 */

static void qemu_file_set_if_error(QEMUFile *f, int ret)

{

    if (ret < 0 && !f->last_error) {

        qemu_file_set_error(f, ret);

    }

}

/** Flushes QEMUFile buffer

 *

 * In case of error, last_error is set.

 */

void qemu_fflush(QEMUFile *f)

{

    if (!f->put_buffer)

        return;

    if (f->is_write && f->buf_index > 0) {

        int len;

        len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);

        if (len > 0)

            f->buf_offset += f->buf_index;

        else

            qemu_file_set_error(f, -EINVAL);

        f->buf_index = 0;

    }

}

static void qemu_fill_buffer(QEMUFile *f)

{

    int len;

    int pending;

    if (!f->get_buffer)

        return;

    if (f->is_write)

        abort();

    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;

    len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,

                        IO_BUF_SIZE - pending);

    if (len > 0) {

        f->buf_size += len;

        f->buf_offset += len;

    } else if (len == 0) {

        f->last_error = -EIO;

    } else if (len != -EAGAIN)

        qemu_file_set_error(f, len);

}

/** Calls close function and set last_error if needed

 *

 * Internal function. qemu_fflush() must be called before this.

 *

 * Returns f->close() return value, or 0 if close function is not set.

 */

static int qemu_fclose_internal(QEMUFile *f)

{

    int ret = 0;

    if (f->close) {

        ret = f->close(f->opaque);

        qemu_file_set_if_error(f, ret);

    }

    return ret;

}

/** 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)

{

    int ret;

    qemu_fflush(f);

    ret = qemu_fclose_internal(f);

    /* 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;

    }

    g_free(f);

    return ret;

}

void qemu_file_put_notify(QEMUFile *f)

{

    f->put_buffer(f->opaque, NULL, 0, 0);

}

void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)

{

    int l;

    if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {

        fprintf(stderr,

                "Attempted to write to buffer while read buffer is not empty\n");

        abort();

    }

    while (!f->last_error && size > 0) {

        l = IO_BUF_SIZE - f->buf_index;

        if (l > size)

            l = size;

        memcpy(f->buf + f->buf_index, buf, l);

        f->is_write = 1;

        f->buf_index += l;

        buf += l;

        size -= l;

        if (f->buf_index >= IO_BUF_SIZE)

            qemu_fflush(f);

    }

}

void qemu_put_byte(QEMUFile *f, int v)

{

    if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {

        fprintf(stderr,

                "Attempted to write to buffer while read buffer is not empty\n");

        abort();

    }

    f->buf[f->buf_index++] = v;

    f->is_write = 1;

    if (f->buf_index >= IO_BUF_SIZE)

        qemu_fflush(f);

}

static void qemu_file_skip(QEMUFile *f, int size)

{

    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)

{

    int pending;

    int index;

    if (f->is_write) {

        abort();

    }

    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;

        }

        qemu_file_skip(f, res);

        buf += res;

        pending -= res;

        done += res;

    }

    return done;

}

static int qemu_peek_byte(QEMUFile *f, int offset)

{

    int index = f->buf_index + offset;

    if (f->is_write) {

        abort();

    }

    if (index >= f->buf_size) {

        qemu_fill_buffer(f);

        index = f->buf_index + offset;

        if (index >= f->buf_size) {

            return 0;

        }

    }

    return f->buf[index];

}

int qemu_get_byte(QEMUFile *f)

{

    int result;

    result = qemu_peek_byte(f, 0);

    qemu_file_skip(f, 1);

    return result;

}

int64_t qemu_ftell(QEMUFile *f)

{

    return f->buf_offset - f->buf_size + f->buf_index;

}

int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)

{

    if (whence == SEEK_SET) {

        /* nothing to do */

    } else if (whence == SEEK_CUR) {

        pos += qemu_ftell(f);

    } else {

        /* SEEK_END not supported */

        return -1;

    }

    if (f->put_buffer) {

        qemu_fflush(f);

        f->buf_offset = pos;

    } else {

        f->buf_offset = pos;

        f->buf_index = 0;

        f->buf_size = 0;

    }

    return pos;

}

int qemu_file_rate_limit(QEMUFile *f)

{

    if (f->rate_limit)

        return f->rate_limit(f->opaque);

    return 0;

}

int64_t qemu_file_get_rate_limit(QEMUFile *f)

{

    if (f->get_rate_limit)

        return f->get_rate_limit(f->opaque);

    return 0;

}

int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)

{

    /* any failed or completed migration keeps its state to allow probing of

     * migration data, but has no associated file anymore */

    if (f && f->set_rate_limit)

        return f->set_rate_limit(f->opaque, new_rate);

    return 0;

}

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;

}

/* 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);

    }

}

/* 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,

};

/* 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;

}

static void put_int8(QEMUFile *f, void *pv, size_t size)

{

    int8_t *v = pv;

    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;

}

static void put_int16(QEMUFile *f, void *pv, size_t size)

{

    int16_t *v = pv;

    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;

}

static void put_int32(QEMUFile *f, void *pv, size_t size)

{

    int32_t *v = pv;

    qemu_put_sbe32s(f, v);

}

const VMStateInfo vmstate_info_int32 = {

    .name = "int32",

    .get  = get_int32,

    .put  = put_int32,

};

/* 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,

};