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14#include "qemu/osdep.h"
15#include <sys/ioctl.h>
16#include "standard-headers/linux/virtio_vsock.h"
17#include "qapi/error.h"
18#include "hw/virtio/virtio-bus.h"
19#include "hw/virtio/virtio-access.h"
20#include "qemu/error-report.h"
21#include "hw/virtio/vhost-vsock.h"
22#include "qemu/iov.h"
23#include "qemu/module.h"
24#include "monitor/monitor.h"
25
26enum {
27 VHOST_VSOCK_SAVEVM_VERSION = 0,
28
29 VHOST_VSOCK_QUEUE_SIZE = 128,
30};
31
32static void vhost_vsock_get_config(VirtIODevice *vdev, uint8_t *config)
33{
34 VHostVSock *vsock = VHOST_VSOCK(vdev);
35 struct virtio_vsock_config vsockcfg = {};
36
37 virtio_stq_p(vdev, &vsockcfg.guest_cid, vsock->conf.guest_cid);
38 memcpy(config, &vsockcfg, sizeof(vsockcfg));
39}
40
41static int vhost_vsock_set_guest_cid(VHostVSock *vsock)
42{
43 const VhostOps *vhost_ops = vsock->vhost_dev.vhost_ops;
44 int ret;
45
46 if (!vhost_ops->vhost_vsock_set_guest_cid) {
47 return -ENOSYS;
48 }
49
50 ret = vhost_ops->vhost_vsock_set_guest_cid(&vsock->vhost_dev,
51 vsock->conf.guest_cid);
52 if (ret < 0) {
53 return -errno;
54 }
55 return 0;
56}
57
58static int vhost_vsock_set_running(VHostVSock *vsock, int start)
59{
60 const VhostOps *vhost_ops = vsock->vhost_dev.vhost_ops;
61 int ret;
62
63 if (!vhost_ops->vhost_vsock_set_running) {
64 return -ENOSYS;
65 }
66
67 ret = vhost_ops->vhost_vsock_set_running(&vsock->vhost_dev, start);
68 if (ret < 0) {
69 return -errno;
70 }
71 return 0;
72}
73
74static void vhost_vsock_start(VirtIODevice *vdev)
75{
76 VHostVSock *vsock = VHOST_VSOCK(vdev);
77 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
78 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
79 int ret;
80 int i;
81
82 if (!k->set_guest_notifiers) {
83 error_report("binding does not support guest notifiers");
84 return;
85 }
86
87 ret = vhost_dev_enable_notifiers(&vsock->vhost_dev, vdev);
88 if (ret < 0) {
89 error_report("Error enabling host notifiers: %d", -ret);
90 return;
91 }
92
93 ret = k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, true);
94 if (ret < 0) {
95 error_report("Error binding guest notifier: %d", -ret);
96 goto err_host_notifiers;
97 }
98
99 vsock->vhost_dev.acked_features = vdev->guest_features;
100 ret = vhost_dev_start(&vsock->vhost_dev, vdev);
101 if (ret < 0) {
102 error_report("Error starting vhost: %d", -ret);
103 goto err_guest_notifiers;
104 }
105
106 ret = vhost_vsock_set_running(vsock, 1);
107 if (ret < 0) {
108 error_report("Error starting vhost vsock: %d", -ret);
109 goto err_dev_start;
110 }
111
112
113
114
115
116 for (i = 0; i < vsock->vhost_dev.nvqs; i++) {
117 vhost_virtqueue_mask(&vsock->vhost_dev, vdev, i, false);
118 }
119
120 return;
121
122err_dev_start:
123 vhost_dev_stop(&vsock->vhost_dev, vdev);
124err_guest_notifiers:
125 k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, false);
126err_host_notifiers:
127 vhost_dev_disable_notifiers(&vsock->vhost_dev, vdev);
128}
129
130static void vhost_vsock_stop(VirtIODevice *vdev)
131{
132 VHostVSock *vsock = VHOST_VSOCK(vdev);
133 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
134 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
135 int ret;
136
137 if (!k->set_guest_notifiers) {
138 return;
139 }
140
141 ret = vhost_vsock_set_running(vsock, 0);
142 if (ret < 0) {
143 error_report("vhost vsock set running failed: %d", ret);
144 return;
145 }
146
147 vhost_dev_stop(&vsock->vhost_dev, vdev);
148
149 ret = k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, false);
150 if (ret < 0) {
151 error_report("vhost guest notifier cleanup failed: %d", ret);
152 return;
153 }
154
155 vhost_dev_disable_notifiers(&vsock->vhost_dev, vdev);
156}
157
158static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status)
159{
160 VHostVSock *vsock = VHOST_VSOCK(vdev);
161 bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
162
163 if (!vdev->vm_running) {
164 should_start = false;
165 }
166
167 if (vsock->vhost_dev.started == should_start) {
168 return;
169 }
170
171 if (should_start) {
172 vhost_vsock_start(vdev);
173 } else {
174 vhost_vsock_stop(vdev);
175 }
176}
177
178static uint64_t vhost_vsock_get_features(VirtIODevice *vdev,
179 uint64_t requested_features,
180 Error **errp)
181{
182
183 return requested_features;
184}
185
186static void vhost_vsock_handle_output(VirtIODevice *vdev, VirtQueue *vq)
187{
188
189}
190
191static void vhost_vsock_guest_notifier_mask(VirtIODevice *vdev, int idx,
192 bool mask)
193{
194 VHostVSock *vsock = VHOST_VSOCK(vdev);
195
196 vhost_virtqueue_mask(&vsock->vhost_dev, vdev, idx, mask);
197}
198
199static bool vhost_vsock_guest_notifier_pending(VirtIODevice *vdev, int idx)
200{
201 VHostVSock *vsock = VHOST_VSOCK(vdev);
202
203 return vhost_virtqueue_pending(&vsock->vhost_dev, idx);
204}
205
206static void vhost_vsock_send_transport_reset(VHostVSock *vsock)
207{
208 VirtQueueElement *elem;
209 VirtQueue *vq = vsock->event_vq;
210 struct virtio_vsock_event event = {
211 .id = cpu_to_le32(VIRTIO_VSOCK_EVENT_TRANSPORT_RESET),
212 };
213
214 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
215 if (!elem) {
216 error_report("vhost-vsock missed transport reset event");
217 return;
218 }
219
220 if (elem->out_num) {
221 error_report("invalid vhost-vsock event virtqueue element with "
222 "out buffers");
223 goto out;
224 }
225
226 if (iov_from_buf(elem->in_sg, elem->in_num, 0,
227 &event, sizeof(event)) != sizeof(event)) {
228 error_report("vhost-vsock event virtqueue element is too short");
229 goto out;
230 }
231
232 virtqueue_push(vq, elem, sizeof(event));
233 virtio_notify(VIRTIO_DEVICE(vsock), vq);
234
235out:
236 g_free(elem);
237}
238
239static void vhost_vsock_post_load_timer_cleanup(VHostVSock *vsock)
240{
241 if (!vsock->post_load_timer) {
242 return;
243 }
244
245 timer_del(vsock->post_load_timer);
246 timer_free(vsock->post_load_timer);
247 vsock->post_load_timer = NULL;
248}
249
250static void vhost_vsock_post_load_timer_cb(void *opaque)
251{
252 VHostVSock *vsock = opaque;
253
254 vhost_vsock_post_load_timer_cleanup(vsock);
255 vhost_vsock_send_transport_reset(vsock);
256}
257
258static int vhost_vsock_pre_save(void *opaque)
259{
260 VHostVSock *vsock = opaque;
261
262
263
264 assert(!vsock->vhost_dev.started);
265
266 return 0;
267}
268
269static int vhost_vsock_post_load(void *opaque, int version_id)
270{
271 VHostVSock *vsock = opaque;
272 VirtIODevice *vdev = VIRTIO_DEVICE(vsock);
273
274 if (virtio_queue_get_addr(vdev, 2)) {
275
276
277
278 assert(!vsock->post_load_timer);
279 vsock->post_load_timer =
280 timer_new_ns(QEMU_CLOCK_VIRTUAL,
281 vhost_vsock_post_load_timer_cb,
282 vsock);
283 timer_mod(vsock->post_load_timer, 1);
284 }
285 return 0;
286}
287
288static const VMStateDescription vmstate_virtio_vhost_vsock = {
289 .name = "virtio-vhost_vsock",
290 .minimum_version_id = VHOST_VSOCK_SAVEVM_VERSION,
291 .version_id = VHOST_VSOCK_SAVEVM_VERSION,
292 .fields = (VMStateField[]) {
293 VMSTATE_VIRTIO_DEVICE,
294 VMSTATE_END_OF_LIST()
295 },
296 .pre_save = vhost_vsock_pre_save,
297 .post_load = vhost_vsock_post_load,
298};
299
300static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
301{
302 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
303 VHostVSock *vsock = VHOST_VSOCK(dev);
304 int vhostfd;
305 int ret;
306
307
308 if (vsock->conf.guest_cid <= 2) {
309 error_setg(errp, "guest-cid property must be greater than 2");
310 return;
311 }
312
313 if (vsock->conf.guest_cid > UINT32_MAX) {
314 error_setg(errp, "guest-cid property must be a 32-bit number");
315 return;
316 }
317
318 if (vsock->conf.vhostfd) {
319 vhostfd = monitor_fd_param(cur_mon, vsock->conf.vhostfd, errp);
320 if (vhostfd == -1) {
321 error_prepend(errp, "vhost-vsock: unable to parse vhostfd: ");
322 return;
323 }
324 } else {
325 vhostfd = open("/dev/vhost-vsock", O_RDWR);
326 if (vhostfd < 0) {
327 error_setg_errno(errp, -errno,
328 "vhost-vsock: failed to open vhost device");
329 return;
330 }
331 }
332
333 virtio_init(vdev, "vhost-vsock", VIRTIO_ID_VSOCK,
334 sizeof(struct virtio_vsock_config));
335
336
337 virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
338 virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
339
340
341 vsock->event_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
342 vhost_vsock_handle_output);
343
344 vsock->vhost_dev.nvqs = ARRAY_SIZE(vsock->vhost_vqs);
345 vsock->vhost_dev.vqs = vsock->vhost_vqs;
346 ret = vhost_dev_init(&vsock->vhost_dev, (void *)(uintptr_t)vhostfd,
347 VHOST_BACKEND_TYPE_KERNEL, 0);
348 if (ret < 0) {
349 error_setg_errno(errp, -ret, "vhost-vsock: vhost_dev_init failed");
350 goto err_virtio;
351 }
352
353 ret = vhost_vsock_set_guest_cid(vsock);
354 if (ret < 0) {
355 error_setg_errno(errp, -ret, "vhost-vsock: unable to set guest cid");
356 goto err_vhost_dev;
357 }
358
359 vsock->post_load_timer = NULL;
360 return;
361
362err_vhost_dev:
363 vhost_dev_cleanup(&vsock->vhost_dev);
364err_virtio:
365 virtio_cleanup(vdev);
366 close(vhostfd);
367 return;
368}
369
370static void vhost_vsock_device_unrealize(DeviceState *dev, Error **errp)
371{
372 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
373 VHostVSock *vsock = VHOST_VSOCK(dev);
374
375 vhost_vsock_post_load_timer_cleanup(vsock);
376
377
378 vhost_vsock_set_status(vdev, 0);
379
380 vhost_dev_cleanup(&vsock->vhost_dev);
381 virtio_cleanup(vdev);
382}
383
384static Property vhost_vsock_properties[] = {
385 DEFINE_PROP_UINT64("guest-cid", VHostVSock, conf.guest_cid, 0),
386 DEFINE_PROP_STRING("vhostfd", VHostVSock, conf.vhostfd),
387 DEFINE_PROP_END_OF_LIST(),
388};
389
390static void vhost_vsock_class_init(ObjectClass *klass, void *data)
391{
392 DeviceClass *dc = DEVICE_CLASS(klass);
393 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
394
395 dc->props = vhost_vsock_properties;
396 dc->vmsd = &vmstate_virtio_vhost_vsock;
397 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
398 vdc->realize = vhost_vsock_device_realize;
399 vdc->unrealize = vhost_vsock_device_unrealize;
400 vdc->get_features = vhost_vsock_get_features;
401 vdc->get_config = vhost_vsock_get_config;
402 vdc->set_status = vhost_vsock_set_status;
403 vdc->guest_notifier_mask = vhost_vsock_guest_notifier_mask;
404 vdc->guest_notifier_pending = vhost_vsock_guest_notifier_pending;
405}
406
407static const TypeInfo vhost_vsock_info = {
408 .name = TYPE_VHOST_VSOCK,
409 .parent = TYPE_VIRTIO_DEVICE,
410 .instance_size = sizeof(VHostVSock),
411 .class_init = vhost_vsock_class_init,
412};
413
414static void vhost_vsock_register_types(void)
415{
416 type_register_static(&vhost_vsock_info);
417}
418
419type_init(vhost_vsock_register_types)
420
