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c6136ec0 SG |
1 | /* |
2 | * Parent class for vhost-vsock devices | |
3 | * | |
4 | * Copyright 2015-2020 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 | #include "standard-headers/linux/virtio_vsock.h" | |
13 | #include "qapi/error.h" | |
14 | #include "hw/virtio/virtio-access.h" | |
15 | #include "qemu/error-report.h" | |
16 | #include "hw/qdev-properties.h" | |
17 | #include "hw/virtio/vhost-vsock.h" | |
18 | #include "qemu/iov.h" | |
19 | #include "monitor/monitor.h" | |
20 | ||
46ce0171 SG |
21 | const int feature_bits[] = { |
22 | VIRTIO_VSOCK_F_SEQPACKET, | |
23 | VHOST_INVALID_FEATURE_BIT | |
24 | }; | |
25 | ||
26 | uint64_t vhost_vsock_common_get_features(VirtIODevice *vdev, uint64_t features, | |
27 | Error **errp) | |
28 | { | |
29 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); | |
30 | ||
31 | if (vvc->seqpacket != ON_OFF_AUTO_OFF) { | |
32 | virtio_add_feature(&features, VIRTIO_VSOCK_F_SEQPACKET); | |
33 | } | |
34 | ||
35 | features = vhost_get_features(&vvc->vhost_dev, feature_bits, features); | |
36 | ||
37 | if (vvc->seqpacket == ON_OFF_AUTO_ON && | |
38 | !virtio_has_feature(features, VIRTIO_VSOCK_F_SEQPACKET)) { | |
39 | error_setg(errp, "vhost-vsock backend doesn't support seqpacket"); | |
40 | } | |
41 | ||
42 | return features; | |
43 | } | |
44 | ||
c6136ec0 SG |
45 | int vhost_vsock_common_start(VirtIODevice *vdev) |
46 | { | |
47 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); | |
48 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); | |
49 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
50 | int ret; | |
51 | int i; | |
52 | ||
53 | if (!k->set_guest_notifiers) { | |
54 | error_report("binding does not support guest notifiers"); | |
55 | return -ENOSYS; | |
56 | } | |
57 | ||
58 | ret = vhost_dev_enable_notifiers(&vvc->vhost_dev, vdev); | |
59 | if (ret < 0) { | |
60 | error_report("Error enabling host notifiers: %d", -ret); | |
61 | return ret; | |
62 | } | |
63 | ||
64 | ret = k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, true); | |
65 | if (ret < 0) { | |
66 | error_report("Error binding guest notifier: %d", -ret); | |
67 | goto err_host_notifiers; | |
68 | } | |
69 | ||
70 | vvc->vhost_dev.acked_features = vdev->guest_features; | |
71 | ret = vhost_dev_start(&vvc->vhost_dev, vdev); | |
72 | if (ret < 0) { | |
73 | error_report("Error starting vhost: %d", -ret); | |
74 | goto err_guest_notifiers; | |
75 | } | |
76 | ||
77 | /* | |
78 | * guest_notifier_mask/pending not used yet, so just unmask | |
79 | * everything here. virtio-pci will do the right thing by | |
80 | * enabling/disabling irqfd. | |
81 | */ | |
82 | for (i = 0; i < vvc->vhost_dev.nvqs; i++) { | |
83 | vhost_virtqueue_mask(&vvc->vhost_dev, vdev, i, false); | |
84 | } | |
85 | ||
86 | return 0; | |
87 | ||
88 | err_guest_notifiers: | |
89 | k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, false); | |
90 | err_host_notifiers: | |
91 | vhost_dev_disable_notifiers(&vvc->vhost_dev, vdev); | |
92 | return ret; | |
93 | } | |
94 | ||
95 | void vhost_vsock_common_stop(VirtIODevice *vdev) | |
96 | { | |
97 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); | |
98 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); | |
99 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
100 | int ret; | |
101 | ||
102 | if (!k->set_guest_notifiers) { | |
103 | return; | |
104 | } | |
105 | ||
106 | vhost_dev_stop(&vvc->vhost_dev, vdev); | |
107 | ||
108 | ret = k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, false); | |
109 | if (ret < 0) { | |
110 | error_report("vhost guest notifier cleanup failed: %d", ret); | |
111 | return; | |
112 | } | |
113 | ||
114 | vhost_dev_disable_notifiers(&vvc->vhost_dev, vdev); | |
115 | } | |
116 | ||
117 | ||
118 | static void vhost_vsock_common_handle_output(VirtIODevice *vdev, VirtQueue *vq) | |
119 | { | |
120 | /* Do nothing */ | |
121 | } | |
122 | ||
123 | static void vhost_vsock_common_guest_notifier_mask(VirtIODevice *vdev, int idx, | |
124 | bool mask) | |
125 | { | |
126 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); | |
127 | ||
128 | vhost_virtqueue_mask(&vvc->vhost_dev, vdev, idx, mask); | |
129 | } | |
130 | ||
131 | static bool vhost_vsock_common_guest_notifier_pending(VirtIODevice *vdev, | |
132 | int idx) | |
133 | { | |
134 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); | |
135 | ||
136 | return vhost_virtqueue_pending(&vvc->vhost_dev, idx); | |
137 | } | |
138 | ||
139 | static void vhost_vsock_common_send_transport_reset(VHostVSockCommon *vvc) | |
140 | { | |
141 | VirtQueueElement *elem; | |
142 | VirtQueue *vq = vvc->event_vq; | |
143 | struct virtio_vsock_event event = { | |
144 | .id = cpu_to_le32(VIRTIO_VSOCK_EVENT_TRANSPORT_RESET), | |
145 | }; | |
146 | ||
147 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); | |
148 | if (!elem) { | |
149 | error_report("vhost-vsock missed transport reset event"); | |
150 | return; | |
151 | } | |
152 | ||
153 | if (elem->out_num) { | |
154 | error_report("invalid vhost-vsock event virtqueue element with " | |
155 | "out buffers"); | |
156 | goto out; | |
157 | } | |
158 | ||
159 | if (iov_from_buf(elem->in_sg, elem->in_num, 0, | |
160 | &event, sizeof(event)) != sizeof(event)) { | |
161 | error_report("vhost-vsock event virtqueue element is too short"); | |
162 | goto out; | |
163 | } | |
164 | ||
165 | virtqueue_push(vq, elem, sizeof(event)); | |
166 | virtio_notify(VIRTIO_DEVICE(vvc), vq); | |
167 | ||
168 | out: | |
169 | g_free(elem); | |
170 | } | |
171 | ||
172 | static void vhost_vsock_common_post_load_timer_cleanup(VHostVSockCommon *vvc) | |
173 | { | |
174 | if (!vvc->post_load_timer) { | |
175 | return; | |
176 | } | |
177 | ||
c6136ec0 SG |
178 | timer_free(vvc->post_load_timer); |
179 | vvc->post_load_timer = NULL; | |
180 | } | |
181 | ||
182 | static void vhost_vsock_common_post_load_timer_cb(void *opaque) | |
183 | { | |
184 | VHostVSockCommon *vvc = opaque; | |
185 | ||
186 | vhost_vsock_common_post_load_timer_cleanup(vvc); | |
187 | vhost_vsock_common_send_transport_reset(vvc); | |
188 | } | |
189 | ||
190 | int vhost_vsock_common_pre_save(void *opaque) | |
191 | { | |
192 | VHostVSockCommon *vvc = opaque; | |
193 | ||
194 | /* | |
195 | * At this point, backend must be stopped, otherwise | |
196 | * it might keep writing to memory. | |
197 | */ | |
198 | assert(!vvc->vhost_dev.started); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | int vhost_vsock_common_post_load(void *opaque, int version_id) | |
204 | { | |
205 | VHostVSockCommon *vvc = opaque; | |
206 | VirtIODevice *vdev = VIRTIO_DEVICE(vvc); | |
207 | ||
208 | if (virtio_queue_get_addr(vdev, 2)) { | |
209 | /* | |
210 | * Defer transport reset event to a vm clock timer so that virtqueue | |
211 | * changes happen after migration has completed. | |
212 | */ | |
213 | assert(!vvc->post_load_timer); | |
214 | vvc->post_load_timer = | |
215 | timer_new_ns(QEMU_CLOCK_VIRTUAL, | |
216 | vhost_vsock_common_post_load_timer_cb, | |
217 | vvc); | |
218 | timer_mod(vvc->post_load_timer, 1); | |
219 | } | |
220 | return 0; | |
221 | } | |
222 | ||
223 | void vhost_vsock_common_realize(VirtIODevice *vdev, const char *name) | |
224 | { | |
225 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); | |
226 | ||
227 | virtio_init(vdev, name, VIRTIO_ID_VSOCK, | |
228 | sizeof(struct virtio_vsock_config)); | |
229 | ||
230 | /* Receive and transmit queues belong to vhost */ | |
231 | vvc->recv_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, | |
232 | vhost_vsock_common_handle_output); | |
233 | vvc->trans_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, | |
234 | vhost_vsock_common_handle_output); | |
235 | ||
236 | /* The event queue belongs to QEMU */ | |
237 | vvc->event_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, | |
238 | vhost_vsock_common_handle_output); | |
239 | ||
240 | vvc->vhost_dev.nvqs = ARRAY_SIZE(vvc->vhost_vqs); | |
241 | vvc->vhost_dev.vqs = vvc->vhost_vqs; | |
242 | ||
243 | vvc->post_load_timer = NULL; | |
244 | } | |
245 | ||
246 | void vhost_vsock_common_unrealize(VirtIODevice *vdev) | |
247 | { | |
248 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); | |
249 | ||
250 | vhost_vsock_common_post_load_timer_cleanup(vvc); | |
251 | ||
252 | virtio_delete_queue(vvc->recv_vq); | |
253 | virtio_delete_queue(vvc->trans_vq); | |
254 | virtio_delete_queue(vvc->event_vq); | |
255 | virtio_cleanup(vdev); | |
256 | } | |
257 | ||
46ce0171 SG |
258 | static Property vhost_vsock_common_properties[] = { |
259 | DEFINE_PROP_ON_OFF_AUTO("seqpacket", VHostVSockCommon, seqpacket, | |
260 | ON_OFF_AUTO_AUTO), | |
261 | DEFINE_PROP_END_OF_LIST(), | |
262 | }; | |
263 | ||
c6136ec0 SG |
264 | static void vhost_vsock_common_class_init(ObjectClass *klass, void *data) |
265 | { | |
266 | DeviceClass *dc = DEVICE_CLASS(klass); | |
267 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
268 | ||
46ce0171 | 269 | device_class_set_props(dc, vhost_vsock_common_properties); |
c6136ec0 SG |
270 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
271 | vdc->guest_notifier_mask = vhost_vsock_common_guest_notifier_mask; | |
272 | vdc->guest_notifier_pending = vhost_vsock_common_guest_notifier_pending; | |
273 | } | |
274 | ||
275 | static const TypeInfo vhost_vsock_common_info = { | |
276 | .name = TYPE_VHOST_VSOCK_COMMON, | |
277 | .parent = TYPE_VIRTIO_DEVICE, | |
278 | .instance_size = sizeof(VHostVSockCommon), | |
279 | .class_init = vhost_vsock_common_class_init, | |
280 | .abstract = true, | |
281 | }; | |
282 | ||
283 | static void vhost_vsock_common_register_types(void) | |
284 | { | |
285 | type_register_static(&vhost_vsock_common_info); | |
286 | } | |
287 | ||
288 | type_init(vhost_vsock_common_register_types) |