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
|
/*
* Copyright © 2020, 2021 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL-v2, version 2 or later.
*
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/notify.h"
#include "qom/object_interfaces.h"
#include "io/channel.h"
#include "hw/qdev-core.h"
#include "hw/remote/machine.h"
#include "io/channel-util.h"
#include "qapi/error.h"
#include "sysemu/sysemu.h"
#include "hw/pci/pci.h"
#include "qemu/sockets.h"
#include "monitor/monitor.h"
#define TYPE_REMOTE_OBJECT "x-remote-object"
OBJECT_DECLARE_TYPE(RemoteObject, RemoteObjectClass, REMOTE_OBJECT)
struct RemoteObjectClass {
ObjectClass parent_class;
unsigned int nr_devs;
unsigned int max_devs;
};
struct RemoteObject {
/* private */
Object parent;
Notifier machine_done;
int32_t fd;
char *devid;
QIOChannel *ioc;
DeviceState *dev;
DeviceListener listener;
};
static void remote_object_set_fd(Object *obj, const char *str, Error **errp)
{
ERRP_GUARD();
RemoteObject *o = REMOTE_OBJECT(obj);
int fd = -1;
fd = monitor_fd_param(monitor_cur(), str, errp);
if (fd == -1) {
error_prepend(errp, "Could not parse remote object fd %s:", str);
return;
}
if (!fd_is_socket(fd)) {
error_setg(errp, "File descriptor '%s' is not a socket", str);
close(fd);
return;
}
o->fd = fd;
}
static void remote_object_set_devid(Object *obj, const char *str, Error **errp)
{
RemoteObject *o = REMOTE_OBJECT(obj);
g_free(o->devid);
o->devid = g_strdup(str);
}
static void remote_object_unrealize_listener(DeviceListener *listener,
DeviceState *dev)
{
RemoteObject *o = container_of(listener, RemoteObject, listener);
if (o->dev == dev) {
object_unref(OBJECT(o));
}
}
static void remote_object_machine_done(Notifier *notifier, void *data)
{
RemoteObject *o = container_of(notifier, RemoteObject, machine_done);
DeviceState *dev = NULL;
QIOChannel *ioc = NULL;
Coroutine *co = NULL;
RemoteCommDev *comdev = NULL;
Error *err = NULL;
dev = qdev_find_recursive(sysbus_get_default(), o->devid);
if (!dev || !object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
error_report("%s is not a PCI device", o->devid);
return;
}
ioc = qio_channel_new_fd(o->fd, &err);
if (!ioc) {
error_report_err(err);
return;
}
qio_channel_set_blocking(ioc, false, NULL);
o->dev = dev;
o->listener.unrealize = remote_object_unrealize_listener;
device_listener_register(&o->listener);
/* co-routine should free this. */
comdev = g_new0(RemoteCommDev, 1);
*comdev = (RemoteCommDev) {
.ioc = ioc,
.dev = PCI_DEVICE(dev),
};
co = qemu_coroutine_create(mpqemu_remote_msg_loop_co, comdev);
qemu_coroutine_enter(co);
}
static void remote_object_init(Object *obj)
{
RemoteObjectClass *k = REMOTE_OBJECT_GET_CLASS(obj);
RemoteObject *o = REMOTE_OBJECT(obj);
if (k->nr_devs >= k->max_devs) {
error_report("Reached maximum number of devices: %u", k->max_devs);
return;
}
o->ioc = NULL;
o->fd = -1;
o->devid = NULL;
k->nr_devs++;
o->machine_done.notify = remote_object_machine_done;
qemu_add_machine_init_done_notifier(&o->machine_done);
}
static void remote_object_finalize(Object *obj)
{
RemoteObjectClass *k = REMOTE_OBJECT_GET_CLASS(obj);
RemoteObject *o = REMOTE_OBJECT(obj);
device_listener_unregister(&o->listener);
if (o->ioc) {
qio_channel_shutdown(o->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
qio_channel_close(o->ioc, NULL);
}
object_unref(OBJECT(o->ioc));
k->nr_devs--;
g_free(o->devid);
}
static void remote_object_class_init(ObjectClass *klass, void *data)
{
RemoteObjectClass *k = REMOTE_OBJECT_CLASS(klass);
/*
* Limit number of supported devices to 1. This is done to avoid devices
* from one VM accessing the RAM of another VM. This is done until we
* start using separate address spaces for individual devices.
*/
k->max_devs = 1;
k->nr_devs = 0;
object_class_property_add_str(klass, "fd", NULL, remote_object_set_fd);
object_class_property_add_str(klass, "devid", NULL,
remote_object_set_devid);
}
static const TypeInfo remote_object_info = {
.name = TYPE_REMOTE_OBJECT,
.parent = TYPE_OBJECT,
.instance_size = sizeof(RemoteObject),
.instance_init = remote_object_init,
.instance_finalize = remote_object_finalize,
.class_size = sizeof(RemoteObjectClass),
.class_init = remote_object_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }
}
};
static void register_types(void)
{
type_register_static(&remote_object_info);
}
type_init(register_types);
|
