Merge remote-tracking branch 'remotes/konstantin/tags/qga-win32-pull-2022-01-10'...
[qemu.git] / hw / input / vhost-user-input.c
1 /*
2 * This work is licensed under the terms of the GNU GPL, version 2 or
3 * (at your option) any later version. See the COPYING file in the
4 * top-level directory.
5 */
6
7 #include "qemu/osdep.h"
8 #include "qemu/error-report.h"
9 #include "qapi/error.h"
10 #include "qemu-common.h"
11
12 #include "hw/virtio/virtio-input.h"
13
14 static int vhost_input_config_change(struct vhost_dev *dev)
15 {
16 error_report("vhost-user-input: unhandled backend config change");
17 return -1;
18 }
19
20 static const VhostDevConfigOps config_ops = {
21 .vhost_dev_config_notifier = vhost_input_config_change,
22 };
23
24 static void vhost_input_realize(DeviceState *dev, Error **errp)
25 {
26 VHostUserInput *vhi = VHOST_USER_INPUT(dev);
27 VirtIOInput *vinput = VIRTIO_INPUT(dev);
28 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
29
30 vhost_dev_set_config_notifier(&vhi->vhost->dev, &config_ops);
31 vinput->cfg_size = sizeof_field(virtio_input_config, u);
32 if (vhost_user_backend_dev_init(vhi->vhost, vdev, 2, errp) == -1) {
33 return;
34 }
35 }
36
37 static void vhost_input_change_active(VirtIOInput *vinput)
38 {
39 VHostUserInput *vhi = VHOST_USER_INPUT(vinput);
40
41 if (vinput->active) {
42 vhost_user_backend_start(vhi->vhost);
43 } else {
44 vhost_user_backend_stop(vhi->vhost);
45 }
46 }
47
48 static void vhost_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
49 {
50 VirtIOInput *vinput = VIRTIO_INPUT(vdev);
51 VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
52 Error *local_err = NULL;
53 int ret;
54
55 memset(config_data, 0, vinput->cfg_size);
56
57 ret = vhost_dev_get_config(&vhi->vhost->dev, config_data, vinput->cfg_size,
58 &local_err);
59 if (ret) {
60 error_report_err(local_err);
61 return;
62 }
63 }
64
65 static void vhost_input_set_config(VirtIODevice *vdev,
66 const uint8_t *config_data)
67 {
68 VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
69 int ret;
70
71 ret = vhost_dev_set_config(&vhi->vhost->dev, config_data,
72 0, sizeof(virtio_input_config),
73 VHOST_SET_CONFIG_TYPE_MASTER);
74 if (ret) {
75 error_report("vhost-user-input: set device config space failed");
76 return;
77 }
78
79 virtio_notify_config(vdev);
80 }
81
82 static const VMStateDescription vmstate_vhost_input = {
83 .name = "vhost-user-input",
84 .unmigratable = 1,
85 };
86
87 static void vhost_input_class_init(ObjectClass *klass, void *data)
88 {
89 VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
90 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
91 DeviceClass *dc = DEVICE_CLASS(klass);
92
93 dc->vmsd = &vmstate_vhost_input;
94 vdc->get_config = vhost_input_get_config;
95 vdc->set_config = vhost_input_set_config;
96 vic->realize = vhost_input_realize;
97 vic->change_active = vhost_input_change_active;
98 }
99
100 static void vhost_input_init(Object *obj)
101 {
102 VHostUserInput *vhi = VHOST_USER_INPUT(obj);
103
104 vhi->vhost = VHOST_USER_BACKEND(object_new(TYPE_VHOST_USER_BACKEND));
105 object_property_add_alias(obj, "chardev",
106 OBJECT(vhi->vhost), "chardev");
107 }
108
109 static void vhost_input_finalize(Object *obj)
110 {
111 VHostUserInput *vhi = VHOST_USER_INPUT(obj);
112
113 object_unref(OBJECT(vhi->vhost));
114 }
115
116 static const TypeInfo vhost_input_info = {
117 .name = TYPE_VHOST_USER_INPUT,
118 .parent = TYPE_VIRTIO_INPUT,
119 .instance_size = sizeof(VHostUserInput),
120 .instance_init = vhost_input_init,
121 .instance_finalize = vhost_input_finalize,
122 .class_init = vhost_input_class_init,
123 };
124
125 static void vhost_input_register_types(void)
126 {
127 type_register_static(&vhost_input_info);
128 }
129
130 type_init(vhost_input_register_types)