1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*
* QEMU live migration channel operations
*
* Copyright Red Hat, Inc. 2016
*
* Authors:
* Daniel P. Berrange <berrange@redhat.com>
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "channel.h"
#include "tls.h"
#include "migration.h"
#include "qemu-file.h"
#include "trace.h"
#include "qapi/error.h"
#include "io/channel-tls.h"
#include "io/channel-socket.h"
#include "qemu/yank.h"
#include "yank_functions.h"
/**
* @migration_channel_process_incoming - Create new incoming migration channel
*
* Notice that TLS is special. For it we listen in a listener socket,
* and then create a new client socket from the TLS library.
*
* @ioc: Channel to which we are connecting
*/
void migration_channel_process_incoming(QIOChannel *ioc)
{
MigrationState *s = migrate_get_current();
Error *local_err = NULL;
trace_migration_set_incoming_channel(
ioc, object_get_typename(OBJECT(ioc)));
if (migrate_channel_requires_tls_upgrade(ioc)) {
migration_tls_channel_process_incoming(s, ioc, &local_err);
} else {
migration_ioc_register_yank(ioc);
migration_ioc_process_incoming(ioc, &local_err);
}
if (local_err) {
error_report_err(local_err);
}
}
/**
* @migration_channel_connect - Create new outgoing migration channel
*
* @s: Current migration state
* @ioc: Channel to which we are connecting
* @hostname: Where we want to connect
* @error: Error indicating failure to connect, free'd here
*/
void migration_channel_connect(MigrationState *s,
QIOChannel *ioc,
const char *hostname,
Error *error)
{
trace_migration_set_outgoing_channel(
ioc, object_get_typename(OBJECT(ioc)), hostname, error);
if (!error) {
if (migrate_channel_requires_tls_upgrade(ioc)) {
migration_tls_channel_connect(s, ioc, hostname, &error);
if (!error) {
/* tls_channel_connect will call back to this
* function after the TLS handshake,
* so we mustn't call migrate_fd_connect until then
*/
return;
}
} else {
QEMUFile *f = qemu_file_new_output(ioc);
migration_ioc_register_yank(ioc);
qemu_mutex_lock(&s->qemu_file_lock);
s->to_dst_file = f;
qemu_mutex_unlock(&s->qemu_file_lock);
}
}
migrate_fd_connect(s, error);
error_free(error);
}
/**
* @migration_channel_read_peek - Peek at migration channel, without
* actually removing it from channel buffer.
*
* @ioc: the channel object
* @buf: the memory region to read data into
* @buflen: the number of bytes to read in @buf
* @errp: pointer to a NULL-initialized error object
*
* Returns 0 if successful, returns -1 and sets @errp if fails.
*/
int migration_channel_read_peek(QIOChannel *ioc,
const char *buf,
const size_t buflen,
Error **errp)
{
ssize_t len = 0;
struct iovec iov = { .iov_base = (char *)buf, .iov_len = buflen };
while (true) {
len = qio_channel_readv_full(ioc, &iov, 1, NULL, NULL,
QIO_CHANNEL_READ_FLAG_MSG_PEEK, errp);
if (len < 0 && len != QIO_CHANNEL_ERR_BLOCK) {
return -1;
}
if (len == 0) {
error_setg(errp, "Failed to peek at channel");
return -1;
}
if (len == buflen) {
break;
}
/* 1ms sleep. */
if (qemu_in_coroutine()) {
qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 1000000);
} else {
g_usleep(1000);
}
}
return 0;
}
|
