Merge remote-tracking branch 'remotes/legoater/tags/pull-ppc-20220118' into staging
[qemu.git] / hw / virtio / vhost-user-vsock.c
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
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
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
55 static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
56 {
57 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
58 bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
59
60 if (!vdev->vm_running) {
61 should_start = false;
62 }
63
64 if (vvc->vhost_dev.started == should_start) {
65 return;
66 }
67
68 if (should_start) {
69 int ret = vhost_vsock_common_start(vdev);
70 if (ret < 0) {
71 return;
72 }
73 } else {
74 vhost_vsock_common_stop(vdev);
75 }
76 }
77
78 static uint64_t vuv_get_features(VirtIODevice *vdev,
79 uint64_t features,
80 Error **errp)
81 {
82 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
83
84 features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
85
86 return vhost_vsock_common_get_features(vdev, features, errp);
87 }
88
89 static const VMStateDescription vuv_vmstate = {
90 .name = "vhost-user-vsock",
91 .unmigratable = 1,
92 };
93
94 static void vuv_device_realize(DeviceState *dev, Error **errp)
95 {
96 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
97 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
98 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
99 int ret;
100
101 if (!vsock->conf.chardev.chr) {
102 error_setg(errp, "missing chardev");
103 return;
104 }
105
106 if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) {
107 return;
108 }
109
110 vhost_vsock_common_realize(vdev, "vhost-user-vsock");
111
112 vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
113
114 ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
115 VHOST_BACKEND_TYPE_USER, 0, errp);
116 if (ret < 0) {
117 goto err_virtio;
118 }
119
120 ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
121 sizeof(struct virtio_vsock_config), errp);
122 if (ret < 0) {
123 goto err_vhost_dev;
124 }
125
126 return;
127
128 err_vhost_dev:
129 vhost_dev_cleanup(&vvc->vhost_dev);
130 err_virtio:
131 vhost_vsock_common_unrealize(vdev);
132 vhost_user_cleanup(&vsock->vhost_user);
133 return;
134 }
135
136 static void vuv_device_unrealize(DeviceState *dev)
137 {
138 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
139 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
140 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
141
142 /* This will stop vhost backend if appropriate. */
143 vuv_set_status(vdev, 0);
144
145 vhost_dev_cleanup(&vvc->vhost_dev);
146
147 vhost_vsock_common_unrealize(vdev);
148
149 vhost_user_cleanup(&vsock->vhost_user);
150
151 }
152
153 static Property vuv_properties[] = {
154 DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
155 DEFINE_PROP_END_OF_LIST(),
156 };
157
158 static void vuv_class_init(ObjectClass *klass, void *data)
159 {
160 DeviceClass *dc = DEVICE_CLASS(klass);
161 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
162
163 device_class_set_props(dc, vuv_properties);
164 dc->vmsd = &vuv_vmstate;
165 vdc->realize = vuv_device_realize;
166 vdc->unrealize = vuv_device_unrealize;
167 vdc->get_features = vuv_get_features;
168 vdc->get_config = vuv_get_config;
169 vdc->set_status = vuv_set_status;
170 }
171
172 static const TypeInfo vuv_info = {
173 .name = TYPE_VHOST_USER_VSOCK,
174 .parent = TYPE_VHOST_VSOCK_COMMON,
175 .instance_size = sizeof(VHostUserVSock),
176 .class_init = vuv_class_init,
177 };
178
179 static void vuv_register_types(void)
180 {
181 type_register_static(&vuv_info);
182 }
183
184 type_init(vuv_register_types)