summaryrefslogtreecommitdiff
path: root/migration-exec.c
blob: 6ed322a9894df8de6fd807ca7058f44c19e5fe11 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 * QEMU live migration
 *
 * Copyright IBM, Corp. 2008
 * Copyright Dell MessageOne 2008
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *  Charles Duffy     <charles_duffy@messageone.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#include "qemu-common.h"
#include "qemu_socket.h"
#include "migration.h"
#include "qemu-char.h"
#include "sysemu.h"
#include "console.h"
#include "buffered_file.h"
#include "block.h"

//#define DEBUG_MIGRATION_EXEC

#ifdef DEBUG_MIGRATION_EXEC
#define dprintf(fmt, ...) \
    do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
    do { } while (0)
#endif

static int file_errno(FdMigrationState *s)
{
    return errno;
}

static int file_write(FdMigrationState *s, const void * buf, size_t size)
{
    return write(s->fd, buf, size);
}

static int exec_close(FdMigrationState *s)
{
    dprintf("exec_close\n");
    if (s->opaque) {
        qemu_fclose(s->opaque);
        s->opaque = NULL;
        s->fd = -1;
    }
    return 0;
}

MigrationState *exec_start_outgoing_migration(const char *command,
                                             int64_t bandwidth_limit,
                                             int async)
{
    FdMigrationState *s;
    FILE *f;

    s = qemu_mallocz(sizeof(*s));

    f = popen(command, "w");
    if (f == NULL) {
        dprintf("Unable to popen exec target\n");
        goto err_after_alloc;
    }

    s->fd = fileno(f);
    if (s->fd == -1) {
        dprintf("Unable to retrieve file descriptor for popen'd handle\n");
        goto err_after_open;
    }

    if (fcntl(s->fd, F_SETFD, O_NONBLOCK) == -1) {
        dprintf("Unable to set nonblocking mode on file descriptor\n");
        goto err_after_open;
    }

    s->opaque = qemu_popen(f, "w");

    s->close = exec_close;
    s->get_error = file_errno;
    s->write = file_write;
    s->mig_state.cancel = migrate_fd_cancel;
    s->mig_state.get_status = migrate_fd_get_status;
    s->mig_state.release = migrate_fd_release;

    s->state = MIG_STATE_ACTIVE;
    s->detach = !async;
    s->bandwidth_limit = bandwidth_limit;

    if (s->detach == 1) {
        dprintf("detaching from monitor\n");
        monitor_suspend();
        s->detach = 2;
    }

    migrate_fd_connect(s);
    return &s->mig_state;

err_after_open:
    pclose(f);
err_after_alloc:
    qemu_free(s);
    return NULL;
}

int exec_start_incoming_migration(const char *command)
{
    int ret;
    QEMUFile *f;

    dprintf("Attempting to start an incoming migration\n");
    f = qemu_popen_cmd(command, "r");
    if(f == NULL) {
        dprintf("Unable to apply qemu wrapper to popen file\n");
        return -errno;
    }
    vm_stop(0); /* just in case */
    ret = qemu_loadvm_state(f);
    if (ret < 0) {
        fprintf(stderr, "load of migration failed\n");
        goto err;
    }
    qemu_announce_self();
    dprintf("successfully loaded vm state\n");
    vm_start();
    qemu_fclose(f);
    return 0;

err:
    qemu_fclose(f);
    return -errno;
}