Merge tag 'kraxel-20220704-pull-request' of https://gitlab.com/kraxel/qemu into staging
[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.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 (migrate_use_tls() &&
42 !object_dynamic_cast(OBJECT(ioc),
43 TYPE_QIO_CHANNEL_TLS)) {
44 migration_tls_channel_process_incoming(s, ioc, &local_err);
45 } else {
46 migration_ioc_register_yank(ioc);
47 migration_ioc_process_incoming(ioc, &local_err);
48 }
49
50 if (local_err) {
51 error_report_err(local_err);
52 }
53 }
54
55
56 /**
57 * @migration_channel_connect - Create new outgoing migration channel
58 *
59 * @s: Current migration state
60 * @ioc: Channel to which we are connecting
61 * @hostname: Where we want to connect
62 * @error: Error indicating failure to connect, free'd here
63 */
64 void migration_channel_connect(MigrationState *s,
65 QIOChannel *ioc,
66 const char *hostname,
67 Error *error)
68 {
69 trace_migration_set_outgoing_channel(
70 ioc, object_get_typename(OBJECT(ioc)), hostname, error);
71
72 if (!error) {
73 if (s->parameters.tls_creds &&
74 *s->parameters.tls_creds &&
75 !object_dynamic_cast(OBJECT(ioc),
76 TYPE_QIO_CHANNEL_TLS)) {
77 migration_tls_channel_connect(s, ioc, hostname, &error);
78
79 if (!error) {
80 /* tls_channel_connect will call back to this
81 * function after the TLS handshake,
82 * so we mustn't call migrate_fd_connect until then
83 */
84
85 return;
86 }
87 } else {
88 QEMUFile *f = qemu_file_new_output(ioc);
89
90 migration_ioc_register_yank(ioc);
91
92 qemu_mutex_lock(&s->qemu_file_lock);
93 s->to_dst_file = f;
94 qemu_mutex_unlock(&s->qemu_file_lock);
95 }
96 }
97 migrate_fd_connect(s, error);
98 error_free(error);
99 }