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 VHOST_INVALID_FEATURE_BIT
25 };
26
vuv_get_config(VirtIODevice * vdev,uint8_t * config)27 static void vuv_get_config(VirtIODevice *vdev, uint8_t *config)
28 {
29 VHostUserVSock *vsock = VHOST_USER_VSOCK(vdev);
30
31 memcpy(config, &vsock->vsockcfg, sizeof(struct virtio_vsock_config));
32 }
33
vuv_handle_config_change(struct vhost_dev * dev)34 static int vuv_handle_config_change(struct vhost_dev *dev)
35 {
36 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev->vdev);
37 Error *local_err = NULL;
38 int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg,
39 sizeof(struct virtio_vsock_config),
40 &local_err);
41 if (ret < 0) {
42 error_report_err(local_err);
43 return -1;
44 }
45
46 virtio_notify_config(dev->vdev);
47
48 return 0;
49 }
50
51 const VhostDevConfigOps vsock_ops = {
52 .vhost_dev_config_notifier = vuv_handle_config_change,
53 };
54
vuv_set_status(VirtIODevice * vdev,uint8_t status)55 static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
56 {
57 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
58 bool should_start = virtio_device_should_start(vdev, status);
59
60 if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) {
61 return;
62 }
63
64 if (should_start) {
65 int ret = vhost_vsock_common_start(vdev);
66 if (ret < 0) {
67 return;
68 }
69 } else {
70 vhost_vsock_common_stop(vdev);
71 }
72 }
73
vuv_get_features(VirtIODevice * vdev,uint64_t features,Error ** errp)74 static uint64_t vuv_get_features(VirtIODevice *vdev,
75 uint64_t features,
76 Error **errp)
77 {
78 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
79
80 features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
81
82 return vhost_vsock_common_get_features(vdev, features, errp);
83 }
84
85 static const VMStateDescription vuv_vmstate = {
86 .name = "vhost-user-vsock",
87 .unmigratable = 1,
88 };
89
vuv_device_realize(DeviceState * dev,Error ** errp)90 static void vuv_device_realize(DeviceState *dev, Error **errp)
91 {
92 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
93 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
94 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
95 int ret;
96
97 if (!vsock->conf.chardev.chr) {
98 error_setg(errp, "missing chardev");
99 return;
100 }
101
102 if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) {
103 return;
104 }
105
106 vhost_vsock_common_realize(vdev);
107
108 vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
109
110 ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
111 VHOST_BACKEND_TYPE_USER, 0, errp);
112 if (ret < 0) {
113 goto err_virtio;
114 }
115
116 ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
117 sizeof(struct virtio_vsock_config), errp);
118 if (ret < 0) {
119 goto err_vhost_dev;
120 }
121
122 return;
123
124 err_vhost_dev:
125 vhost_dev_cleanup(&vvc->vhost_dev);
126 err_virtio:
127 vhost_vsock_common_unrealize(vdev);
128 vhost_user_cleanup(&vsock->vhost_user);
129 return;
130 }
131
vuv_device_unrealize(DeviceState * dev)132 static void vuv_device_unrealize(DeviceState *dev)
133 {
134 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
135 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
136 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
137
138 /* This will stop vhost backend if appropriate. */
139 vuv_set_status(vdev, 0);
140
141 vhost_dev_cleanup(&vvc->vhost_dev);
142
143 vhost_vsock_common_unrealize(vdev);
144
145 vhost_user_cleanup(&vsock->vhost_user);
146
147 }
148
149 static Property vuv_properties[] = {
150 DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
151 DEFINE_PROP_END_OF_LIST(),
152 };
153
vuv_class_init(ObjectClass * klass,void * data)154 static void vuv_class_init(ObjectClass *klass, void *data)
155 {
156 DeviceClass *dc = DEVICE_CLASS(klass);
157 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
158
159 device_class_set_props(dc, vuv_properties);
160 dc->vmsd = &vuv_vmstate;
161 vdc->realize = vuv_device_realize;
162 vdc->unrealize = vuv_device_unrealize;
163 vdc->get_features = vuv_get_features;
164 vdc->get_config = vuv_get_config;
165 vdc->set_status = vuv_set_status;
166 }
167
168 static const TypeInfo vuv_info = {
169 .name = TYPE_VHOST_USER_VSOCK,
170 .parent = TYPE_VHOST_VSOCK_COMMON,
171 .instance_size = sizeof(VHostUserVSock),
172 .class_init = vuv_class_init,
173 };
174
vuv_register_types(void)175 static void vuv_register_types(void)
176 {
177 type_register_static(&vuv_info);
178 }
179
180 type_init(vuv_register_types)
181