@samitouri / QOSamiQemu
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1 /*
2 * Copyright © 2020, 2021 Oracle and/or its affiliates.
3 *
4 * This work is licensed under the terms of the GNU GPL-v2, version 2 or later.
5 *
6 * See the COPYING file in the top-level directory.
7 *
8 */
9
10 #include "qemu/osdep.h"
11
12 #include "qemu/error-report.h"
13 #include "qemu/notify.h"
14 #include "qom/object_interfaces.h"
15 #include "io/channel.h"
16 #include "hw/core/qdev.h"
17 #include "hw/remote/machine.h"
18 #include "io/channel-util.h"
19 #include "qapi/error.h"
20 #include "system/system.h"
21 #include "hw/pci/pci.h"
22 #include "qemu/sockets.h"
23 #include "monitor/monitor.h"
24
25 #define TYPE_REMOTE_OBJECT "x-remote-object"
26 OBJECT_DECLARE_TYPE(RemoteObject, RemoteObjectClass, REMOTE_OBJECT)
27
28 struct RemoteObjectClass {
29 ObjectClass parent_class;
30
31 unsigned int nr_devs;
32 unsigned int max_devs;
33 };
34
35 struct RemoteObject {
36 /* private */
37 Object parent;
38
39 Notifier machine_done;
40
41 int32_t fd;
42 char *devid;
43
44 QIOChannel *ioc;
45
46 DeviceState *dev;
47 DeviceListener listener;
48 };
49
50 static void remote_object_set_fd(Object *obj, const char *str, Error **errp)
51 {
52 ERRP_GUARD();
53 RemoteObject *o = REMOTE_OBJECT(obj);
54 int fd = -1;
55
56 fd = monitor_fd_param(monitor_cur(), str, errp);
57 if (fd == -1) {
58 error_prepend(errp, "Could not parse remote object fd %s:", str);
59 return;
60 }
61
62 if (!fd_is_socket(fd)) {
63 error_setg(errp, "File descriptor '%s' is not a socket", str);
64 close(fd);
65 return;
66 }
67
68 o->fd = fd;
69 }
70
71 static void remote_object_set_devid(Object *obj, const char *str, Error **errp)
72 {
73 RemoteObject *o = REMOTE_OBJECT(obj);
74
75 g_free(o->devid);
76
77 o->devid = g_strdup(str);
78 }
79
80 static void remote_object_unrealize_listener(DeviceListener *listener,
81 DeviceState *dev)
82 {
83 RemoteObject *o = container_of(listener, RemoteObject, listener);
84
85 if (o->dev == dev) {
86 object_unref(OBJECT(o));
87 }
88 }
89
90 static void remote_object_machine_done(Notifier *notifier, void *data)
91 {
92 RemoteObject *o = container_of(notifier, RemoteObject, machine_done);
93 DeviceState *dev = NULL;
94 QIOChannel *ioc = NULL;
95 Coroutine *co = NULL;
96 RemoteCommDev *comdev = NULL;
97 Error *err = NULL;
98
99 dev = qdev_find_recursive(sysbus_get_default(), o->devid);
100 if (!dev || !object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
101 error_report("%s is not a PCI device", o->devid);
102 return;
103 }
104
105 ioc = qio_channel_new_fd(o->fd, &err);
106 if (!ioc) {
107 error_report_err(err);
108 return;
109 }
110 if (!qio_channel_set_blocking(ioc, false, &err)) {
111 error_report_err(err);
112 object_unref(OBJECT(ioc));
113 return;
114 }
115
116 o->dev = dev;
117
118 o->listener.unrealize = remote_object_unrealize_listener;
119 device_listener_register(&o->listener);
120
121 /* co-routine should free this. */
122 comdev = g_new0(RemoteCommDev, 1);
123 *comdev = (RemoteCommDev) {
124 .ioc = ioc,
125 .dev = PCI_DEVICE(dev),
126 };
127
128 co = qemu_coroutine_create(mpqemu_remote_msg_loop_co, comdev);
129 qemu_coroutine_enter(co);
130 }
131
132 static void remote_object_init(Object *obj)
133 {
134 RemoteObjectClass *k = REMOTE_OBJECT_GET_CLASS(obj);
135 RemoteObject *o = REMOTE_OBJECT(obj);
136
137 if (k->nr_devs >= k->max_devs) {
138 error_report("Reached maximum number of devices: %u", k->max_devs);
139 return;
140 }
141
142 o->ioc = NULL;
143 o->fd = -1;
144 o->devid = NULL;
145
146 k->nr_devs++;
147
148 o->machine_done.notify = remote_object_machine_done;
149 qemu_add_machine_init_done_notifier(&o->machine_done);
150 }
151
152 static void remote_object_finalize(Object *obj)
153 {
154 RemoteObjectClass *k = REMOTE_OBJECT_GET_CLASS(obj);
155 RemoteObject *o = REMOTE_OBJECT(obj);
156
157 if (o->listener.unrealize) {
158 device_listener_unregister(&o->listener);
159 }
160
161 if (o->ioc) {
162 qio_channel_shutdown(o->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
163 qio_channel_close(o->ioc, NULL);
164 }
165
166 object_unref(OBJECT(o->ioc));
167
168 k->nr_devs--;
169 g_free(o->devid);
170 }
171
172 static void remote_object_class_init(ObjectClass *klass, const void *data)
173 {
174 RemoteObjectClass *k = REMOTE_OBJECT_CLASS(klass);
175
176 /*
177 * Limit number of supported devices to 1. This is done to avoid devices
178 * from one VM accessing the RAM of another VM. This is done until we
179 * start using separate address spaces for individual devices.
180 */
181 k->max_devs = 1;
182 k->nr_devs = 0;
183
184 object_class_property_add_str(klass, "fd", NULL, remote_object_set_fd);
185 object_class_property_add_str(klass, "devid", NULL,
186 remote_object_set_devid);
187 }
188
189 static const TypeInfo remote_object_info = {
190 .name = TYPE_REMOTE_OBJECT,
191 .parent = TYPE_OBJECT,
192 .instance_size = sizeof(RemoteObject),
193 .instance_init = remote_object_init,
194 .instance_finalize = remote_object_finalize,
195 .class_size = sizeof(RemoteObjectClass),
196 .class_init = remote_object_class_init,
197 .interfaces = (const InterfaceInfo[]) {
198 { TYPE_USER_CREATABLE },
199 { }
200 }
201 };
202
203 static void register_types(void)
204 {
205 type_register_static(&remote_object_info);
206 }
207
208 type_init(register_types);