xref: /openbmc/qemu/hw/virtio/vhost-user-vsock.c (revision 05caa062)
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 
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 
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 
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 
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 
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 
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 
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 
177 static void vuv_register_types(void)
178 {
179     type_register_static(&vuv_info);
180 }
181 
182 type_init(vuv_register_types)
183