Merge remote-tracking branch 'remotes/alistair23/tags/pull-riscv-to-apply-20211022...
[qemu.git] / migration / channel.c
1 /*
2 * QEMU live migration channel operations
3 *
4 * Copyright Red Hat, Inc. 2016
5 *
6 * Authors:
7 * Daniel P. Berrange <berrange@redhat.com>
8 *
9 * Contributions after 2012-01-13 are licensed under the terms of the
10 * GNU GPL, version 2 or (at your option) any later version.
11 */
12
13 #include "qemu/osdep.h"
14 #include "channel.h"
15 #include "tls.h"
16 #include "migration.h"
17 #include "qemu-file-channel.h"
18 #include "trace.h"
19 #include "qapi/error.h"
20 #include "io/channel-tls.h"
21 #include "io/channel-socket.h"
22 #include "qemu/yank.h"
23 #include "yank_functions.h"
24
25 /**
26 * @migration_channel_process_incoming - Create new incoming migration channel
27 *
28 * Notice that TLS is special. For it we listen in a listener socket,
29 * and then create a new client socket from the TLS library.
30 *
31 * @ioc: Channel to which we are connecting
32 */
33 void migration_channel_process_incoming(QIOChannel *ioc)
34 {
35 MigrationState *s = migrate_get_current();
36 Error *local_err = NULL;
37
38 trace_migration_set_incoming_channel(
39 ioc, object_get_typename(OBJECT(ioc)));
40
41 if (s->parameters.tls_creds &&
42 *s->parameters.tls_creds &&
43 !object_dynamic_cast(OBJECT(ioc),
44 TYPE_QIO_CHANNEL_TLS)) {
45 migration_tls_channel_process_incoming(s, ioc, &local_err);
46 } else {
47 if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET) ||
48 object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS)) {
49 yank_register_function(MIGRATION_YANK_INSTANCE,
50 migration_yank_iochannel,
51 QIO_CHANNEL(ioc));
52 }
53
54 migration_ioc_process_incoming(ioc, &local_err);
55 }
56
57 if (local_err) {
58 error_report_err(local_err);
59 }
60 }
61
62
63 /**
64 * @migration_channel_connect - Create new outgoing migration channel
65 *
66 * @s: Current migration state
67 * @ioc: Channel to which we are connecting
68 * @hostname: Where we want to connect
69 * @error: Error indicating failure to connect, free'd here
70 */
71 void migration_channel_connect(MigrationState *s,
72 QIOChannel *ioc,
73 const char *hostname,
74 Error *error)
75 {
76 trace_migration_set_outgoing_channel(
77 ioc, object_get_typename(OBJECT(ioc)), hostname, error);
78
79 if (!error) {
80 if (s->parameters.tls_creds &&
81 *s->parameters.tls_creds &&
82 !object_dynamic_cast(OBJECT(ioc),
83 TYPE_QIO_CHANNEL_TLS)) {
84 migration_tls_channel_connect(s, ioc, hostname, &error);
85
86 if (!error) {
87 /* tls_channel_connect will call back to this
88 * function after the TLS handshake,
89 * so we mustn't call migrate_fd_connect until then
90 */
91
92 return;
93 }
94 } else {
95 QEMUFile *f = qemu_fopen_channel_output(ioc);
96
97 if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET) ||
98 object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS)) {
99 yank_register_function(MIGRATION_YANK_INSTANCE,
100 migration_yank_iochannel,
101 QIO_CHANNEL(ioc));
102 }
103
104 qemu_mutex_lock(&s->qemu_file_lock);
105 s->to_dst_file = f;
106 qemu_mutex_unlock(&s->qemu_file_lock);
107 }
108 }
109 migrate_fd_connect(s, error);
110 g_free(s->hostname);
111 error_free(error);
112 }