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global s/fflush(logfile)/qemu_log_flush()/ (Eduardo Habkost)
[qemu.git] / migration-tcp.c
CommitLineData
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1/*
2 * QEMU live migration
3 *
4 * Copyright IBM, Corp. 2008
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14#include "qemu-common.h"
15#include "qemu_socket.h"
16#include "migration.h"
17#include "qemu-char.h"
18#include "sysemu.h"
19#include "console.h"
20#include "buffered_file.h"
21#include "block.h"
22
23//#define DEBUG_MIGRATION_TCP
24
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25#ifdef DEBUG_MIGRATION_TCP
26#define dprintf(fmt, ...) \
27 do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
28#else
29#define dprintf(fmt, ...) \
30 do { } while (0)
31#endif
32
065e2813 33static int socket_errno(FdMigrationState *s)
34c9dd8e 34{
8ad9fa5d 35 return socket_error();
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36}
37
065e2813 38static int socket_write(FdMigrationState *s, const void * buf, size_t size)
34c9dd8e 39{
065e2813 40 return send(s->fd, buf, size, 0);
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41}
42
065e2813 43static int tcp_close(FdMigrationState *s)
34c9dd8e 44{
065e2813 45 dprintf("tcp_close\n");
34c9dd8e 46 if (s->fd != -1) {
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47 close(s->fd);
48 s->fd = -1;
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49 }
50 return 0;
51}
52
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53
54static void tcp_wait_for_connect(void *opaque)
55{
56 FdMigrationState *s = opaque;
57 int val, ret;
4761a48b 58 socklen_t valsize = sizeof(val);
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59
60 dprintf("connect completed\n");
61 do {
62 ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
065e2813 63 } while (ret == -1 && (s->get_error(s)) == EINTR);
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64
65 if (ret < 0) {
065e2813 66 migrate_fd_error(s);
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67 return;
68 }
69
70 qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
71
72 if (val == 0)
065e2813 73 migrate_fd_connect(s);
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74 else {
75 dprintf("error connecting %d\n", val);
065e2813 76 migrate_fd_error(s);
34c9dd8e 77 }
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78}
79
80MigrationState *tcp_start_outgoing_migration(const char *host_port,
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81 int64_t bandwidth_limit,
82 int async)
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83{
84 struct sockaddr_in addr;
85 FdMigrationState *s;
86 int ret;
87
88 if (parse_host_port(&addr, host_port) < 0)
89 return NULL;
90
91 s = qemu_mallocz(sizeof(*s));
92 if (s == NULL)
93 return NULL;
94
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95 s->get_error = socket_errno;
96 s->write = socket_write;
97 s->close = tcp_close;
98 s->mig_state.cancel = migrate_fd_cancel;
99 s->mig_state.get_status = migrate_fd_get_status;
100 s->mig_state.release = migrate_fd_release;
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101
102 s->state = MIG_STATE_ACTIVE;
103 s->detach = !async;
104 s->bandwidth_limit = bandwidth_limit;
105 s->fd = socket(PF_INET, SOCK_STREAM, 0);
106 if (s->fd == -1) {
107 qemu_free(s);
ff8d81d8 108 return NULL;
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109 }
110
17e90973 111 socket_set_nonblock(s->fd);
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112
113 if (s->detach == 1) {
114 dprintf("detaching from monitor\n");
115 monitor_suspend();
ff8d81d8 116 s->detach = 2;
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117 }
118
119 do {
120 ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
121 if (ret == -1)
065e2813 122 ret = -(s->get_error(s));
34c9dd8e 123
c1d36665 124 if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
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125 qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
126 } while (ret == -EINTR);
127
c1d36665 128 if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) {
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129 dprintf("connect failed\n");
130 close(s->fd);
131 qemu_free(s);
88d2d9e0 132 return NULL;
34c9dd8e 133 } else if (ret >= 0)
065e2813 134 migrate_fd_connect(s);
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135
136 return &s->mig_state;
137}
138
139static void tcp_accept_incoming_migration(void *opaque)
140{
141 struct sockaddr_in addr;
142 socklen_t addrlen = sizeof(addr);
143 int s = (unsigned long)opaque;
144 QEMUFile *f;
145 int c, ret;
146
147 do {
148 c = accept(s, (struct sockaddr *)&addr, &addrlen);
c1d36665 149 } while (c == -1 && socket_error() == EINTR);
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150
151 dprintf("accepted migration\n");
152
153 if (c == -1) {
154 fprintf(stderr, "could not accept migration connection\n");
155 return;
156 }
157
c1d36665 158 f = qemu_fopen_socket(c);
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159 if (f == NULL) {
160 fprintf(stderr, "could not qemu_fopen socket\n");
161 goto out;
162 }
163
164 vm_stop(0); /* just in case */
165 ret = qemu_loadvm_state(f);
166 if (ret < 0) {
167 fprintf(stderr, "load of migration failed\n");
168 goto out_fopen;
169 }
170 qemu_announce_self();
171 dprintf("successfully loaded vm state\n");
172
173 /* we've successfully migrated, close the server socket */
174 qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
175 close(s);
176
177 vm_start();
178
179out_fopen:
180 qemu_fclose(f);
181out:
182 close(c);
183}
184
185int tcp_start_incoming_migration(const char *host_port)
186{
187 struct sockaddr_in addr;
188 int val;
189 int s;
190
191 if (parse_host_port(&addr, host_port) < 0) {
192 fprintf(stderr, "invalid host/port combination: %s\n", host_port);
193 return -EINVAL;
194 }
195
196 s = socket(PF_INET, SOCK_STREAM, 0);
197 if (s == -1)
c1d36665 198 return -socket_error();
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199
200 val = 1;
201 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
202
203 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
204 goto err;
205
206 if (listen(s, 1) == -1)
207 goto err;
208
209 qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
210 (void *)(unsigned long)s);
211
212 return 0;
213
214err:
215 close(s);
c1d36665 216 return -socket_error();
34c9dd8e 217}