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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/*
* Copyright (c) 2021-2024 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "migration/cpr.h"
#include "migration/misc.h"
#include "migration/options.h"
#include "migration/qemu-file.h"
#include "migration/savevm.h"
#include "migration/vmstate.h"
#include "system/runstate.h"
#include "trace.h"
/*************************************************************************/
/* cpr state container for all information to be saved. */
typedef QLIST_HEAD(CprFdList, CprFd) CprFdList;
typedef struct CprState {
CprFdList fds;
} CprState;
static CprState cpr_state;
/****************************************************************************/
typedef struct CprFd {
char *name;
unsigned int namelen;
int id;
int fd;
QLIST_ENTRY(CprFd) next;
} CprFd;
static const VMStateDescription vmstate_cpr_fd = {
.name = "cpr fd",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(namelen, CprFd),
VMSTATE_VBUFFER_ALLOC_UINT32(name, CprFd, 0, NULL, namelen),
VMSTATE_INT32(id, CprFd),
VMSTATE_FD(fd, CprFd),
VMSTATE_END_OF_LIST()
}
};
void cpr_save_fd(const char *name, int id, int fd)
{
CprFd *elem = g_new0(CprFd, 1);
trace_cpr_save_fd(name, id, fd);
elem->name = g_strdup(name);
elem->namelen = strlen(name) + 1;
elem->id = id;
elem->fd = fd;
QLIST_INSERT_HEAD(&cpr_state.fds, elem, next);
}
static CprFd *find_fd(CprFdList *head, const char *name, int id)
{
CprFd *elem;
QLIST_FOREACH(elem, head, next) {
if (!strcmp(elem->name, name) && elem->id == id) {
return elem;
}
}
return NULL;
}
void cpr_delete_fd(const char *name, int id)
{
CprFd *elem = find_fd(&cpr_state.fds, name, id);
if (elem) {
QLIST_REMOVE(elem, next);
g_free(elem->name);
g_free(elem);
}
trace_cpr_delete_fd(name, id);
}
int cpr_find_fd(const char *name, int id)
{
CprFd *elem = find_fd(&cpr_state.fds, name, id);
int fd = elem ? elem->fd : -1;
trace_cpr_find_fd(name, id, fd);
return fd;
}
/*************************************************************************/
#define CPR_STATE "CprState"
static const VMStateDescription vmstate_cpr_state = {
.name = CPR_STATE,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_QLIST_V(fds, CprState, 1, vmstate_cpr_fd, CprFd, next),
VMSTATE_END_OF_LIST()
}
};
/*************************************************************************/
static QEMUFile *cpr_state_file;
QIOChannel *cpr_state_ioc(void)
{
return qemu_file_get_ioc(cpr_state_file);
}
static MigMode incoming_mode = MIG_MODE_NONE;
MigMode cpr_get_incoming_mode(void)
{
return incoming_mode;
}
void cpr_set_incoming_mode(MigMode mode)
{
incoming_mode = mode;
}
bool cpr_is_incoming(void)
{
return incoming_mode != MIG_MODE_NONE;
}
int cpr_state_save(MigrationChannel *channel, Error **errp)
{
int ret;
QEMUFile *f;
MigMode mode = migrate_mode();
trace_cpr_state_save(MigMode_str(mode));
if (mode == MIG_MODE_CPR_TRANSFER) {
g_assert(channel);
f = cpr_transfer_output(channel, errp);
} else {
return 0;
}
if (!f) {
return -1;
}
qemu_put_be32(f, QEMU_CPR_FILE_MAGIC);
qemu_put_be32(f, QEMU_CPR_FILE_VERSION);
ret = vmstate_save_state(f, &vmstate_cpr_state, &cpr_state, 0);
if (ret) {
error_setg(errp, "vmstate_save_state error %d", ret);
qemu_fclose(f);
return ret;
}
/*
* Close the socket only partially so we can later detect when the other
* end closes by getting a HUP event.
*/
qemu_fflush(f);
qio_channel_shutdown(qemu_file_get_ioc(f), QIO_CHANNEL_SHUTDOWN_WRITE,
NULL);
cpr_state_file = f;
return 0;
}
int cpr_state_load(MigrationChannel *channel, Error **errp)
{
int ret;
uint32_t v;
QEMUFile *f;
MigMode mode = 0;
if (channel) {
mode = MIG_MODE_CPR_TRANSFER;
cpr_set_incoming_mode(mode);
f = cpr_transfer_input(channel, errp);
} else {
return 0;
}
if (!f) {
return -1;
}
trace_cpr_state_load(MigMode_str(mode));
v = qemu_get_be32(f);
if (v != QEMU_CPR_FILE_MAGIC) {
error_setg(errp, "Not a migration stream (bad magic %x)", v);
qemu_fclose(f);
return -EINVAL;
}
v = qemu_get_be32(f);
if (v != QEMU_CPR_FILE_VERSION) {
error_setg(errp, "Unsupported migration stream version %d", v);
qemu_fclose(f);
return -ENOTSUP;
}
ret = vmstate_load_state(f, &vmstate_cpr_state, &cpr_state, 1);
if (ret) {
error_setg(errp, "vmstate_load_state error %d", ret);
qemu_fclose(f);
return ret;
}
/*
* Let the caller decide when to close the socket (and generate a HUP event
* for the sending side).
*/
cpr_state_file = f;
return ret;
}
void cpr_state_close(void)
{
if (cpr_state_file) {
qemu_fclose(cpr_state_file);
cpr_state_file = NULL;
}
}
|
