1 /*
2 * Vhost-user vsock virtio device
3 *
4 * Copyright 2020 Red Hat, Inc.
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * (at your option) any later version. See the COPYING file in the
8 * top-level directory.
9 */
10
11 #include "qemu/osdep.h"
12
13 #include "qapi/error.h"
14 #include "qemu/error-report.h"
15 #include "hw/qdev-properties.h"
16 #include "hw/qdev-properties-system.h"
17 #include "hw/virtio/vhost-user-vsock.h"
18
19 static const int user_feature_bits[] = {
20 VIRTIO_F_VERSION_1,
21 VIRTIO_RING_F_INDIRECT_DESC,
22 VIRTIO_RING_F_EVENT_IDX,
23 VIRTIO_F_NOTIFY_ON_EMPTY,
24 VIRTIO_F_IN_ORDER,
25 VIRTIO_F_NOTIFICATION_DATA,
26 VHOST_INVALID_FEATURE_BIT
27 };
28
vuv_get_config(VirtIODevice * vdev,uint8_t * config)29 static void vuv_get_config(VirtIODevice *vdev, uint8_t *config)
30 {
31 VHostUserVSock *vsock = VHOST_USER_VSOCK(vdev);
32
33 memcpy(config, &vsock->vsockcfg, sizeof(struct virtio_vsock_config));
34 }
35
vuv_handle_config_change(struct vhost_dev * dev)36 static int vuv_handle_config_change(struct vhost_dev *dev)
37 {
38 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev->vdev);
39 Error *local_err = NULL;
40 int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg,
41 sizeof(struct virtio_vsock_config),
42 &local_err);
43 if (ret < 0) {
44 error_report_err(local_err);
45 return -1;
46 }
47
48 virtio_notify_config(dev->vdev);
49
50 return 0;
51 }
52
53 const VhostDevConfigOps vsock_ops = {
54 .vhost_dev_config_notifier = vuv_handle_config_change,
55 };
56
vuv_set_status(VirtIODevice * vdev,uint8_t status)57 static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
58 {
59 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
60 bool should_start = virtio_device_should_start(vdev, status);
61
62 if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) {
63 return;
64 }
65
66 if (should_start) {
67 int ret = vhost_vsock_common_start(vdev);
68 if (ret < 0) {
69 return;
70 }
71 } else {
72 vhost_vsock_common_stop(vdev);
73 }
74 }
75
vuv_get_features(VirtIODevice * vdev,uint64_t features,Error ** errp)76 static uint64_t vuv_get_features(VirtIODevice *vdev,
77 uint64_t features,
78 Error **errp)
79 {
80 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
81
82 features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
83
84 return vhost_vsock_common_get_features(vdev, features, errp);
85 }
86
87 static const VMStateDescription vuv_vmstate = {
88 .name = "vhost-user-vsock",
89 .unmigratable = 1,
90 };
91
vuv_device_realize(DeviceState * dev,Error ** errp)92 static void vuv_device_realize(DeviceState *dev, Error **errp)
93 {
94 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
95 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
96 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
97 int ret;
98
99 if (!vsock->conf.chardev.chr) {
100 error_setg(errp, "missing chardev");
101 return;
102 }
103
104 if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) {
105 return;
106 }
107
108 vhost_vsock_common_realize(vdev);
109
110 vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
111
112 ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
113 VHOST_BACKEND_TYPE_USER, 0, errp);
114 if (ret < 0) {
115 goto err_virtio;
116 }
117
118 ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
119 sizeof(struct virtio_vsock_config), errp);
120 if (ret < 0) {
121 goto err_vhost_dev;
122 }
123
124 return;
125
126 err_vhost_dev:
127 vhost_dev_cleanup(&vvc->vhost_dev);
128 err_virtio:
129 vhost_vsock_common_unrealize(vdev);
130 vhost_user_cleanup(&vsock->vhost_user);
131 return;
132 }
133
vuv_device_unrealize(DeviceState * dev)134 static void vuv_device_unrealize(DeviceState *dev)
135 {
136 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
137 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
138 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
139
140 /* This will stop vhost backend if appropriate. */
141 vuv_set_status(vdev, 0);
142
143 vhost_dev_cleanup(&vvc->vhost_dev);
144
145 vhost_vsock_common_unrealize(vdev);
146
147 vhost_user_cleanup(&vsock->vhost_user);
148
149 }
150
151 static Property vuv_properties[] = {
152 DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
153 DEFINE_PROP_END_OF_LIST(),
154 };
155
vuv_class_init(ObjectClass * klass,void * data)156 static void vuv_class_init(ObjectClass *klass, void *data)
157 {
158 DeviceClass *dc = DEVICE_CLASS(klass);
159 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
160
161 device_class_set_props(dc, vuv_properties);
162 dc->vmsd = &vuv_vmstate;
163 vdc->realize = vuv_device_realize;
164 vdc->unrealize = vuv_device_unrealize;
165 vdc->get_features = vuv_get_features;
166 vdc->get_config = vuv_get_config;
167 vdc->set_status = vuv_set_status;
168 }
169
170 static const TypeInfo vuv_info = {
171 .name = TYPE_VHOST_USER_VSOCK,
172 .parent = TYPE_VHOST_VSOCK_COMMON,
173 .instance_size = sizeof(VHostUserVSock),
174 .class_init = vuv_class_init,
175 };
176
vuv_register_types(void)177 static void vuv_register_types(void)
178 {
179 type_register_static(&vuv_info);
180 }
181
182 type_init(vuv_register_types)
183