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065e2813 AL |
1 | /* |
2 | * QEMU live migration | |
3 | * | |
4 | * Copyright IBM, Corp. 2008 | |
5 | * Copyright Dell MessageOne 2008 | |
6 | * | |
7 | * Authors: | |
8 | * Anthony Liguori <aliguori@us.ibm.com> | |
9 | * Charles Duffy <charles_duffy@messageone.com> | |
10 | * | |
11 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
12 | * the COPYING file in the top-level directory. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include "qemu-common.h" | |
17 | #include "qemu_socket.h" | |
18 | #include "migration.h" | |
19 | #include "qemu-char.h" | |
20 | #include "sysemu.h" | |
065e2813 AL |
21 | #include "buffered_file.h" |
22 | #include "block.h" | |
23 | ||
24 | //#define DEBUG_MIGRATION_EXEC | |
25 | ||
26 | #ifdef DEBUG_MIGRATION_EXEC | |
27 | #define dprintf(fmt, ...) \ | |
28 | do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0) | |
29 | #else | |
30 | #define dprintf(fmt, ...) \ | |
31 | do { } while (0) | |
32 | #endif | |
33 | ||
34 | static int file_errno(FdMigrationState *s) | |
35 | { | |
36 | return errno; | |
37 | } | |
38 | ||
39 | static int file_write(FdMigrationState *s, const void * buf, size_t size) | |
40 | { | |
41 | return write(s->fd, buf, size); | |
42 | } | |
43 | ||
44 | static int exec_close(FdMigrationState *s) | |
45 | { | |
46 | dprintf("exec_close\n"); | |
47 | if (s->opaque) { | |
48 | qemu_fclose(s->opaque); | |
49 | s->opaque = NULL; | |
50 | s->fd = -1; | |
51 | } | |
52 | return 0; | |
53 | } | |
54 | ||
55 | MigrationState *exec_start_outgoing_migration(const char *command, | |
56 | int64_t bandwidth_limit, | |
731b0364 | 57 | int detach) |
065e2813 AL |
58 | { |
59 | FdMigrationState *s; | |
60 | FILE *f; | |
61 | ||
62 | s = qemu_mallocz(sizeof(*s)); | |
065e2813 AL |
63 | |
64 | f = popen(command, "w"); | |
65 | if (f == NULL) { | |
66 | dprintf("Unable to popen exec target\n"); | |
67 | goto err_after_alloc; | |
68 | } | |
69 | ||
70 | s->fd = fileno(f); | |
71 | if (s->fd == -1) { | |
72 | dprintf("Unable to retrieve file descriptor for popen'd handle\n"); | |
73 | goto err_after_open; | |
74 | } | |
75 | ||
90750009 | 76 | socket_set_nonblock(s->fd); |
065e2813 AL |
77 | |
78 | s->opaque = qemu_popen(f, "w"); | |
79 | ||
8ad9fa5d | 80 | s->close = exec_close; |
065e2813 AL |
81 | s->get_error = file_errno; |
82 | s->write = file_write; | |
83 | s->mig_state.cancel = migrate_fd_cancel; | |
84 | s->mig_state.get_status = migrate_fd_get_status; | |
85 | s->mig_state.release = migrate_fd_release; | |
86 | ||
87 | s->state = MIG_STATE_ACTIVE; | |
731b0364 | 88 | s->mon_resume = NULL; |
065e2813 AL |
89 | s->bandwidth_limit = bandwidth_limit; |
90 | ||
731b0364 AL |
91 | if (!detach) |
92 | migrate_fd_monitor_suspend(s); | |
065e2813 AL |
93 | |
94 | migrate_fd_connect(s); | |
95 | return &s->mig_state; | |
96 | ||
97 | err_after_open: | |
98 | pclose(f); | |
99 | err_after_alloc: | |
100 | qemu_free(s); | |
065e2813 AL |
101 | return NULL; |
102 | } | |
103 | ||
8a43b1ea | 104 | static void exec_accept_incoming_migration(void *opaque) |
065e2813 | 105 | { |
8a43b1ea | 106 | QEMUFile *f = opaque; |
065e2813 | 107 | int ret; |
065e2813 | 108 | |
065e2813 AL |
109 | ret = qemu_loadvm_state(f); |
110 | if (ret < 0) { | |
111 | fprintf(stderr, "load of migration failed\n"); | |
112 | goto err; | |
113 | } | |
114 | qemu_announce_self(); | |
115 | dprintf("successfully loaded vm state\n"); | |
8a43b1ea | 116 | /* we've successfully migrated, close the fd */ |
7f79dd28 | 117 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); |
d399f677 PB |
118 | if (autostart) |
119 | vm_start(); | |
065e2813 AL |
120 | |
121 | err: | |
122 | qemu_fclose(f); | |
8a43b1ea CL |
123 | } |
124 | ||
125 | int exec_start_incoming_migration(const char *command) | |
126 | { | |
127 | QEMUFile *f; | |
128 | ||
129 | dprintf("Attempting to start an incoming migration\n"); | |
130 | f = qemu_popen_cmd(command, "r"); | |
131 | if(f == NULL) { | |
132 | dprintf("Unable to apply qemu wrapper to popen file\n"); | |
133 | return -errno; | |
134 | } | |
135 | ||
7f79dd28 | 136 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, |
8a43b1ea CL |
137 | exec_accept_incoming_migration, NULL, |
138 | (void *)(unsigned long)f); | |
139 | ||
140 | return 0; | |
065e2813 | 141 | } |