]> git.proxmox.com Git - qemu.git/blob - migration-exec.c
global s/fflush(logfile)/qemu_log_flush()/ (Eduardo Habkost)
[qemu.git] / migration-exec.c
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"
21 #include "console.h"
22 #include "buffered_file.h"
23 #include "block.h"
24
25 //#define DEBUG_MIGRATION_EXEC
26
27 #ifdef DEBUG_MIGRATION_EXEC
28 #define dprintf(fmt, ...) \
29 do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
30 #else
31 #define dprintf(fmt, ...) \
32 do { } while (0)
33 #endif
34
35 static int file_errno(FdMigrationState *s)
36 {
37 return errno;
38 }
39
40 static int file_write(FdMigrationState *s, const void * buf, size_t size)
41 {
42 return write(s->fd, buf, size);
43 }
44
45 static int exec_close(FdMigrationState *s)
46 {
47 dprintf("exec_close\n");
48 if (s->opaque) {
49 qemu_fclose(s->opaque);
50 s->opaque = NULL;
51 s->fd = -1;
52 }
53 return 0;
54 }
55
56 MigrationState *exec_start_outgoing_migration(const char *command,
57 int64_t bandwidth_limit,
58 int async)
59 {
60 FdMigrationState *s;
61 FILE *f;
62
63 s = qemu_mallocz(sizeof(*s));
64 if (s == NULL) {
65 dprintf("Unable to allocate FdMigrationState\n");
66 goto err;
67 }
68
69 f = popen(command, "w");
70 if (f == NULL) {
71 dprintf("Unable to popen exec target\n");
72 goto err_after_alloc;
73 }
74
75 s->fd = fileno(f);
76 if (s->fd == -1) {
77 dprintf("Unable to retrieve file descriptor for popen'd handle\n");
78 goto err_after_open;
79 }
80
81 if (fcntl(s->fd, F_SETFD, O_NONBLOCK) == -1) {
82 dprintf("Unable to set nonblocking mode on file descriptor\n");
83 goto err_after_open;
84 }
85
86 s->opaque = qemu_popen(f, "w");
87
88 s->close = exec_close;
89 s->get_error = file_errno;
90 s->write = file_write;
91 s->mig_state.cancel = migrate_fd_cancel;
92 s->mig_state.get_status = migrate_fd_get_status;
93 s->mig_state.release = migrate_fd_release;
94
95 s->state = MIG_STATE_ACTIVE;
96 s->detach = !async;
97 s->bandwidth_limit = bandwidth_limit;
98
99 if (s->detach == 1) {
100 dprintf("detaching from monitor\n");
101 monitor_suspend();
102 s->detach = 2;
103 }
104
105 migrate_fd_connect(s);
106 return &s->mig_state;
107
108 err_after_open:
109 pclose(f);
110 err_after_alloc:
111 qemu_free(s);
112 err:
113 return NULL;
114 }
115
116 int exec_start_incoming_migration(const char *command)
117 {
118 int ret;
119 QEMUFile *f;
120
121 dprintf("Attempting to start an incoming migration\n");
122 f = qemu_popen_cmd(command, "r");
123 if(f == NULL) {
124 dprintf("Unable to apply qemu wrapper to popen file\n");
125 return -errno;
126 }
127 vm_stop(0); /* just in case */
128 ret = qemu_loadvm_state(f);
129 if (ret < 0) {
130 fprintf(stderr, "load of migration failed\n");
131 goto err;
132 }
133 qemu_announce_self();
134 dprintf("successfully loaded vm state\n");
135 vm_start();
136 qemu_fclose(f);
137 return 0;
138
139 err:
140 qemu_fclose(f);
141 return -errno;
142 }