root / migration-fd.c @ 4dad7f1e
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1 | 5ac1fad3 | Paolo Bonzini | /*
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2 | 5ac1fad3 | Paolo Bonzini | * QEMU live migration via generic fd
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3 | 5ac1fad3 | Paolo Bonzini | *
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4 | 5ac1fad3 | Paolo Bonzini | * Copyright Red Hat, Inc. 2009
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5 | 5ac1fad3 | Paolo Bonzini | *
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6 | 5ac1fad3 | Paolo Bonzini | * Authors:
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7 | 5ac1fad3 | Paolo Bonzini | * Chris Lalancette <clalance@redhat.com>
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8 | 5ac1fad3 | Paolo Bonzini | *
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9 | 5ac1fad3 | Paolo Bonzini | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 5ac1fad3 | Paolo Bonzini | * the COPYING file in the top-level directory.
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11 | 5ac1fad3 | Paolo Bonzini | *
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12 | 5ac1fad3 | Paolo Bonzini | */
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13 | 5ac1fad3 | Paolo Bonzini | |
14 | 5ac1fad3 | Paolo Bonzini | #include "qemu-common.h" |
15 | 5ac1fad3 | Paolo Bonzini | #include "qemu_socket.h" |
16 | 5ac1fad3 | Paolo Bonzini | #include "migration.h" |
17 | 5ac1fad3 | Paolo Bonzini | #include "monitor.h" |
18 | 5ac1fad3 | Paolo Bonzini | #include "qemu-char.h" |
19 | 5ac1fad3 | Paolo Bonzini | #include "buffered_file.h" |
20 | 5ac1fad3 | Paolo Bonzini | #include "block.h" |
21 | 5ac1fad3 | Paolo Bonzini | #include "qemu_socket.h" |
22 | 5ac1fad3 | Paolo Bonzini | |
23 | 5ac1fad3 | Paolo Bonzini | //#define DEBUG_MIGRATION_FD
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24 | 5ac1fad3 | Paolo Bonzini | |
25 | 5ac1fad3 | Paolo Bonzini | #ifdef DEBUG_MIGRATION_FD
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26 | d0f2c4c6 | malc | #define DPRINTF(fmt, ...) \
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27 | 5ac1fad3 | Paolo Bonzini | do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0) |
28 | 5ac1fad3 | Paolo Bonzini | #else
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29 | d0f2c4c6 | malc | #define DPRINTF(fmt, ...) \
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30 | 5ac1fad3 | Paolo Bonzini | do { } while (0) |
31 | 5ac1fad3 | Paolo Bonzini | #endif
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32 | 5ac1fad3 | Paolo Bonzini | |
33 | 5ac1fad3 | Paolo Bonzini | static int fd_errno(FdMigrationState *s) |
34 | 5ac1fad3 | Paolo Bonzini | { |
35 | 5ac1fad3 | Paolo Bonzini | return errno;
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36 | 5ac1fad3 | Paolo Bonzini | } |
37 | 5ac1fad3 | Paolo Bonzini | |
38 | 5ac1fad3 | Paolo Bonzini | static int fd_write(FdMigrationState *s, const void * buf, size_t size) |
39 | 5ac1fad3 | Paolo Bonzini | { |
40 | 5ac1fad3 | Paolo Bonzini | return write(s->fd, buf, size);
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41 | 5ac1fad3 | Paolo Bonzini | } |
42 | 5ac1fad3 | Paolo Bonzini | |
43 | 5ac1fad3 | Paolo Bonzini | static int fd_close(FdMigrationState *s) |
44 | 5ac1fad3 | Paolo Bonzini | { |
45 | d0f2c4c6 | malc | DPRINTF("fd_close\n");
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46 | 5ac1fad3 | Paolo Bonzini | if (s->fd != -1) { |
47 | 5ac1fad3 | Paolo Bonzini | close(s->fd); |
48 | 5ac1fad3 | Paolo Bonzini | s->fd = -1;
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49 | 5ac1fad3 | Paolo Bonzini | } |
50 | 5ac1fad3 | Paolo Bonzini | return 0; |
51 | 5ac1fad3 | Paolo Bonzini | } |
52 | 5ac1fad3 | Paolo Bonzini | |
53 | 5ac1fad3 | Paolo Bonzini | MigrationState *fd_start_outgoing_migration(Monitor *mon, |
54 | 5ac1fad3 | Paolo Bonzini | const char *fdname, |
55 | 5ac1fad3 | Paolo Bonzini | int64_t bandwidth_limit, |
56 | c163b5ca | lirans@il.ibm.com | int detach,
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57 | c163b5ca | lirans@il.ibm.com | int blk,
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58 | c163b5ca | lirans@il.ibm.com | int inc)
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59 | 5ac1fad3 | Paolo Bonzini | { |
60 | 5ac1fad3 | Paolo Bonzini | FdMigrationState *s; |
61 | 5ac1fad3 | Paolo Bonzini | |
62 | 5ac1fad3 | Paolo Bonzini | s = qemu_mallocz(sizeof(*s));
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63 | 5ac1fad3 | Paolo Bonzini | |
64 | 5ac1fad3 | Paolo Bonzini | s->fd = monitor_get_fd(mon, fdname); |
65 | 5ac1fad3 | Paolo Bonzini | if (s->fd == -1) { |
66 | d0f2c4c6 | malc | DPRINTF("fd_migration: invalid file descriptor identifier\n");
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67 | 5ac1fad3 | Paolo Bonzini | goto err_after_alloc;
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68 | 5ac1fad3 | Paolo Bonzini | } |
69 | 5ac1fad3 | Paolo Bonzini | |
70 | 5ac1fad3 | Paolo Bonzini | if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) { |
71 | d0f2c4c6 | malc | DPRINTF("Unable to set nonblocking mode on file descriptor\n");
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72 | 5ac1fad3 | Paolo Bonzini | goto err_after_open;
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73 | 5ac1fad3 | Paolo Bonzini | } |
74 | 5ac1fad3 | Paolo Bonzini | |
75 | 5ac1fad3 | Paolo Bonzini | s->get_error = fd_errno; |
76 | 5ac1fad3 | Paolo Bonzini | s->write = fd_write; |
77 | 5ac1fad3 | Paolo Bonzini | s->close = fd_close; |
78 | 5ac1fad3 | Paolo Bonzini | s->mig_state.cancel = migrate_fd_cancel; |
79 | 5ac1fad3 | Paolo Bonzini | s->mig_state.get_status = migrate_fd_get_status; |
80 | 5ac1fad3 | Paolo Bonzini | s->mig_state.release = migrate_fd_release; |
81 | 5ac1fad3 | Paolo Bonzini | |
82 | c163b5ca | lirans@il.ibm.com | s->mig_state.blk = blk; |
83 | c163b5ca | lirans@il.ibm.com | s->mig_state.shared = inc; |
84 | f327aa0c | Jan Kiszka | |
85 | 5ac1fad3 | Paolo Bonzini | s->state = MIG_STATE_ACTIVE; |
86 | f327aa0c | Jan Kiszka | s->mon = NULL;
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87 | 5ac1fad3 | Paolo Bonzini | s->bandwidth_limit = bandwidth_limit; |
88 | 5ac1fad3 | Paolo Bonzini | |
89 | f327aa0c | Jan Kiszka | if (!detach) {
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90 | f327aa0c | Jan Kiszka | migrate_fd_monitor_suspend(s, mon); |
91 | f327aa0c | Jan Kiszka | } |
92 | 5ac1fad3 | Paolo Bonzini | |
93 | 5ac1fad3 | Paolo Bonzini | migrate_fd_connect(s); |
94 | 5ac1fad3 | Paolo Bonzini | return &s->mig_state;
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95 | 5ac1fad3 | Paolo Bonzini | |
96 | 5ac1fad3 | Paolo Bonzini | err_after_open:
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97 | 5ac1fad3 | Paolo Bonzini | close(s->fd); |
98 | 5ac1fad3 | Paolo Bonzini | err_after_alloc:
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99 | 5ac1fad3 | Paolo Bonzini | qemu_free(s); |
100 | 5ac1fad3 | Paolo Bonzini | return NULL; |
101 | 5ac1fad3 | Paolo Bonzini | } |
102 | 5ac1fad3 | Paolo Bonzini | |
103 | 5ac1fad3 | Paolo Bonzini | static void fd_accept_incoming_migration(void *opaque) |
104 | 5ac1fad3 | Paolo Bonzini | { |
105 | 5ac1fad3 | Paolo Bonzini | QEMUFile *f = opaque; |
106 | 5ac1fad3 | Paolo Bonzini | |
107 | 511c0231 | Juan Quintela | process_incoming_migration(f); |
108 | cfaf6d36 | Juan Quintela | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); |
109 | 5ac1fad3 | Paolo Bonzini | qemu_fclose(f); |
110 | 5ac1fad3 | Paolo Bonzini | } |
111 | 5ac1fad3 | Paolo Bonzini | |
112 | 5ac1fad3 | Paolo Bonzini | int fd_start_incoming_migration(const char *infd) |
113 | 5ac1fad3 | Paolo Bonzini | { |
114 | 5ac1fad3 | Paolo Bonzini | int fd;
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115 | 5ac1fad3 | Paolo Bonzini | QEMUFile *f; |
116 | 5ac1fad3 | Paolo Bonzini | |
117 | d0f2c4c6 | malc | DPRINTF("Attempting to start an incoming migration via fd\n");
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118 | 5ac1fad3 | Paolo Bonzini | |
119 | 5ac1fad3 | Paolo Bonzini | fd = strtol(infd, NULL, 0); |
120 | 5ac1fad3 | Paolo Bonzini | f = qemu_fdopen(fd, "rb");
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121 | 5ac1fad3 | Paolo Bonzini | if(f == NULL) { |
122 | d0f2c4c6 | malc | DPRINTF("Unable to apply qemu wrapper to file descriptor\n");
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123 | 5ac1fad3 | Paolo Bonzini | return -errno;
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124 | 5ac1fad3 | Paolo Bonzini | } |
125 | 5ac1fad3 | Paolo Bonzini | |
126 | 1c39e2a2 | Juan Quintela | qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f); |
127 | 5ac1fad3 | Paolo Bonzini | |
128 | 5ac1fad3 | Paolo Bonzini | return 0; |
129 | 5ac1fad3 | Paolo Bonzini | } |