xref: /illumos-kvm-cmd/migration-tcp.c (revision 68396ea9)
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 "buffered_file.h"
20 #include "block.h"
21 
22 //#define DEBUG_MIGRATION_TCP
23 
24 #ifdef DEBUG_MIGRATION_TCP
25 #define DPRINTF(fmt, ...) \
26     do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
27 #else
28 #define DPRINTF(fmt, ...) \
29     do { } while (0)
30 #endif
31 
socket_errno(FdMigrationState * s)32 static int socket_errno(FdMigrationState *s)
33 {
34     return socket_error();
35 }
36 
socket_write(FdMigrationState * s,const void * buf,size_t size)37 static int socket_write(FdMigrationState *s, const void * buf, size_t size)
38 {
39     return send(s->fd, buf, size, 0);
40 }
41 
tcp_close(FdMigrationState * s)42 static int tcp_close(FdMigrationState *s)
43 {
44     DPRINTF("tcp_close\n");
45     if (s->fd != -1) {
46         close(s->fd);
47         s->fd = -1;
48     }
49     return 0;
50 }
51 
52 
tcp_wait_for_connect(void * opaque)53 static void tcp_wait_for_connect(void *opaque)
54 {
55     FdMigrationState *s = opaque;
56     int val, ret;
57     socklen_t valsize = sizeof(val);
58 
59     DPRINTF("connect completed\n");
60     do {
61         ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
62     } while (ret == -1 && (s->get_error(s)) == EINTR);
63 
64     if (ret < 0) {
65         migrate_fd_error(s);
66         return;
67     }
68 
69     qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
70 
71     if (val == 0)
72         migrate_fd_connect(s);
73     else {
74         DPRINTF("error connecting %d\n", val);
75         migrate_fd_error(s);
76     }
77 }
78 
tcp_start_outgoing_migration(Monitor * mon,const char * host_port,int64_t bandwidth_limit,int detach,int blk,int inc)79 MigrationState *tcp_start_outgoing_migration(Monitor *mon,
80                                              const char *host_port,
81                                              int64_t bandwidth_limit,
82                                              int detach,
83 					     int blk,
84 					     int inc)
85 {
86     struct sockaddr_in addr;
87     FdMigrationState *s;
88     int ret;
89 
90     if (parse_host_port(&addr, host_port) < 0)
91         return NULL;
92 
93     s = qemu_mallocz(sizeof(*s));
94 
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;
101 
102     s->mig_state.blk = blk;
103     s->mig_state.shared = inc;
104 
105     s->state = MIG_STATE_ACTIVE;
106     s->mon = NULL;
107     s->bandwidth_limit = bandwidth_limit;
108     s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
109     if (s->fd == -1) {
110         qemu_free(s);
111         return NULL;
112     }
113 
114     socket_set_nonblock(s->fd);
115 
116     if (!detach) {
117         migrate_fd_monitor_suspend(s, mon);
118     }
119 
120     do {
121         ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
122         if (ret == -1)
123             ret = -(s->get_error(s));
124 
125         if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
126             qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
127     } while (ret == -EINTR);
128 
129     if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) {
130         DPRINTF("connect failed\n");
131         migrate_fd_error(s);
132     } else if (ret >= 0)
133         migrate_fd_connect(s);
134 
135     return &s->mig_state;
136 }
137 
tcp_accept_incoming_migration(void * opaque)138 static void tcp_accept_incoming_migration(void *opaque)
139 {
140     struct sockaddr_in addr;
141     socklen_t addrlen = sizeof(addr);
142     int s = (unsigned long)opaque;
143     QEMUFile *f;
144     int c;
145 
146     do {
147         c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
148     } while (c == -1 && socket_error() == EINTR);
149 
150     DPRINTF("accepted migration\n");
151 
152     if (c == -1) {
153         fprintf(stderr, "could not accept migration connection\n");
154         goto out2;
155     }
156 
157     f = qemu_fopen_socket(c);
158     if (f == NULL) {
159         fprintf(stderr, "could not qemu_fopen socket\n");
160         goto out;
161     }
162 
163     process_incoming_migration(f);
164     qemu_fclose(f);
165 out:
166     close(c);
167 out2:
168     qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
169     close(s);
170 }
171 
tcp_start_incoming_migration(const char * host_port)172 int tcp_start_incoming_migration(const char *host_port)
173 {
174     struct sockaddr_in addr;
175     int val;
176     int s;
177 
178     if (parse_host_port(&addr, host_port) < 0) {
179         fprintf(stderr, "invalid host/port combination: %s\n", host_port);
180         return -EINVAL;
181     }
182 
183     s = qemu_socket(PF_INET, SOCK_STREAM, 0);
184     if (s == -1)
185         return -socket_error();
186 
187     val = 1;
188     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
189 
190     if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
191         goto err;
192 
193     if (listen(s, 1) == -1)
194         goto err;
195 
196     qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
197                          (void *)(unsigned long)s);
198 
199     return 0;
200 
201 err:
202     close(s);
203     return -socket_error();
204 }
205