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e72f66a0 SH |
1 | /* |
2 | * Dedicated thread for virtio-blk I/O processing | |
3 | * | |
4 | * Copyright 2012 IBM, Corp. | |
5 | * Copyright 2012 Red Hat, Inc. and/or its affiliates | |
6 | * | |
7 | * Authors: | |
8 | * Stefan Hajnoczi <stefanha@redhat.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
11 | * See the COPYING file in the top-level directory. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include "trace.h" | |
16 | #include "qemu/iov.h" | |
e72f66a0 | 17 | #include "qemu/thread.h" |
b4a42f81 | 18 | #include "qemu/error-report.h" |
0d09e41a | 19 | #include "hw/virtio/dataplane/vring.h" |
e72f66a0 | 20 | #include "ioq.h" |
b4a42f81 | 21 | #include "block/block.h" |
0d09e41a PB |
22 | #include "hw/virtio/virtio-blk.h" |
23 | #include "virtio-blk.h" | |
2c20e711 | 24 | #include "block/aio.h" |
1c819449 | 25 | #include "hw/virtio/virtio-bus.h" |
e72f66a0 SH |
26 | |
27 | enum { | |
28 | SEG_MAX = 126, /* maximum number of I/O segments */ | |
29 | VRING_MAX = SEG_MAX + 2, /* maximum number of vring descriptors */ | |
30 | REQ_MAX = VRING_MAX, /* maximum number of requests in the vring, | |
31 | * is VRING_MAX / 2 with traditional and | |
32 | * VRING_MAX with indirect descriptors */ | |
33 | }; | |
34 | ||
35 | typedef struct { | |
36 | struct iocb iocb; /* Linux AIO control block */ | |
37 | QEMUIOVector *inhdr; /* iovecs for virtio_blk_inhdr */ | |
38 | unsigned int head; /* vring descriptor index */ | |
de0161c0 SH |
39 | struct iovec *bounce_iov; /* used if guest buffers are unaligned */ |
40 | QEMUIOVector *read_qiov; /* for read completion /w bounce buffer */ | |
e72f66a0 SH |
41 | } VirtIOBlockRequest; |
42 | ||
43 | struct VirtIOBlockDataPlane { | |
44 | bool started; | |
cd7fdfe5 | 45 | bool stopping; |
e72f66a0 SH |
46 | QEMUBH *start_bh; |
47 | QemuThread thread; | |
48 | ||
49 | VirtIOBlkConf *blk; | |
50 | int fd; /* image file descriptor */ | |
51 | ||
52 | VirtIODevice *vdev; | |
53 | Vring vring; /* virtqueue vring */ | |
54 | EventNotifier *guest_notifier; /* irq */ | |
55 | ||
2c20e711 PB |
56 | /* Note that these EventNotifiers are assigned by value. This is |
57 | * fine as long as you do not call event_notifier_cleanup on them | |
58 | * (because you don't own the file descriptor or handle; you just | |
59 | * use it). | |
60 | */ | |
61 | AioContext *ctx; | |
62 | EventNotifier io_notifier; /* Linux AIO completion */ | |
63 | EventNotifier host_notifier; /* doorbell */ | |
e72f66a0 SH |
64 | |
65 | IOQueue ioqueue; /* Linux AIO queue (should really be per | |
66 | dataplane thread) */ | |
67 | VirtIOBlockRequest requests[REQ_MAX]; /* pool of requests, managed by the | |
68 | queue */ | |
69 | ||
70 | unsigned int num_reqs; | |
e72f66a0 SH |
71 | }; |
72 | ||
73 | /* Raise an interrupt to signal guest, if necessary */ | |
74 | static void notify_guest(VirtIOBlockDataPlane *s) | |
75 | { | |
76 | if (!vring_should_notify(s->vdev, &s->vring)) { | |
77 | return; | |
78 | } | |
79 | ||
80 | event_notifier_set(s->guest_notifier); | |
81 | } | |
82 | ||
83 | static void complete_request(struct iocb *iocb, ssize_t ret, void *opaque) | |
84 | { | |
85 | VirtIOBlockDataPlane *s = opaque; | |
86 | VirtIOBlockRequest *req = container_of(iocb, VirtIOBlockRequest, iocb); | |
87 | struct virtio_blk_inhdr hdr; | |
88 | int len; | |
89 | ||
90 | if (likely(ret >= 0)) { | |
91 | hdr.status = VIRTIO_BLK_S_OK; | |
92 | len = ret; | |
93 | } else { | |
94 | hdr.status = VIRTIO_BLK_S_IOERR; | |
95 | len = 0; | |
96 | } | |
97 | ||
98 | trace_virtio_blk_data_plane_complete_request(s, req->head, ret); | |
99 | ||
de0161c0 SH |
100 | if (req->read_qiov) { |
101 | assert(req->bounce_iov); | |
102 | qemu_iovec_from_buf(req->read_qiov, 0, req->bounce_iov->iov_base, len); | |
103 | qemu_iovec_destroy(req->read_qiov); | |
104 | g_slice_free(QEMUIOVector, req->read_qiov); | |
105 | } | |
106 | ||
107 | if (req->bounce_iov) { | |
108 | qemu_vfree(req->bounce_iov->iov_base); | |
109 | g_slice_free(struct iovec, req->bounce_iov); | |
110 | } | |
111 | ||
e72f66a0 SH |
112 | qemu_iovec_from_buf(req->inhdr, 0, &hdr, sizeof(hdr)); |
113 | qemu_iovec_destroy(req->inhdr); | |
114 | g_slice_free(QEMUIOVector, req->inhdr); | |
115 | ||
116 | /* According to the virtio specification len should be the number of bytes | |
117 | * written to, but for virtio-blk it seems to be the number of bytes | |
118 | * transferred plus the status bytes. | |
119 | */ | |
120 | vring_push(&s->vring, req->head, len + sizeof(hdr)); | |
121 | ||
122 | s->num_reqs--; | |
123 | } | |
124 | ||
125 | static void complete_request_early(VirtIOBlockDataPlane *s, unsigned int head, | |
126 | QEMUIOVector *inhdr, unsigned char status) | |
127 | { | |
128 | struct virtio_blk_inhdr hdr = { | |
129 | .status = status, | |
130 | }; | |
131 | ||
132 | qemu_iovec_from_buf(inhdr, 0, &hdr, sizeof(hdr)); | |
133 | qemu_iovec_destroy(inhdr); | |
134 | g_slice_free(QEMUIOVector, inhdr); | |
135 | ||
136 | vring_push(&s->vring, head, sizeof(hdr)); | |
137 | notify_guest(s); | |
138 | } | |
139 | ||
140 | /* Get disk serial number */ | |
141 | static void do_get_id_cmd(VirtIOBlockDataPlane *s, | |
142 | struct iovec *iov, unsigned int iov_cnt, | |
143 | unsigned int head, QEMUIOVector *inhdr) | |
144 | { | |
145 | char id[VIRTIO_BLK_ID_BYTES]; | |
146 | ||
147 | /* Serial number not NUL-terminated when shorter than buffer */ | |
148 | strncpy(id, s->blk->serial ? s->blk->serial : "", sizeof(id)); | |
149 | iov_from_buf(iov, iov_cnt, 0, id, sizeof(id)); | |
150 | complete_request_early(s, head, inhdr, VIRTIO_BLK_S_OK); | |
151 | } | |
152 | ||
b5ef1aab SH |
153 | static int do_rdwr_cmd(VirtIOBlockDataPlane *s, bool read, |
154 | struct iovec *iov, unsigned int iov_cnt, | |
155 | long long offset, unsigned int head, | |
156 | QEMUIOVector *inhdr) | |
157 | { | |
158 | struct iocb *iocb; | |
de0161c0 SH |
159 | QEMUIOVector qiov; |
160 | struct iovec *bounce_iov = NULL; | |
161 | QEMUIOVector *read_qiov = NULL; | |
162 | ||
163 | qemu_iovec_init_external(&qiov, iov, iov_cnt); | |
164 | if (!bdrv_qiov_is_aligned(s->blk->conf.bs, &qiov)) { | |
165 | void *bounce_buffer = qemu_blockalign(s->blk->conf.bs, qiov.size); | |
166 | ||
167 | if (read) { | |
168 | /* Need to copy back from bounce buffer on completion */ | |
169 | read_qiov = g_slice_new(QEMUIOVector); | |
170 | qemu_iovec_init(read_qiov, iov_cnt); | |
171 | qemu_iovec_concat_iov(read_qiov, iov, iov_cnt, 0, qiov.size); | |
172 | } else { | |
173 | qemu_iovec_to_buf(&qiov, 0, bounce_buffer, qiov.size); | |
174 | } | |
175 | ||
176 | /* Redirect I/O to aligned bounce buffer */ | |
177 | bounce_iov = g_slice_new(struct iovec); | |
178 | bounce_iov->iov_base = bounce_buffer; | |
179 | bounce_iov->iov_len = qiov.size; | |
180 | iov = bounce_iov; | |
181 | iov_cnt = 1; | |
182 | } | |
b5ef1aab SH |
183 | |
184 | iocb = ioq_rdwr(&s->ioqueue, read, iov, iov_cnt, offset); | |
185 | ||
186 | /* Fill in virtio block metadata needed for completion */ | |
187 | VirtIOBlockRequest *req = container_of(iocb, VirtIOBlockRequest, iocb); | |
188 | req->head = head; | |
189 | req->inhdr = inhdr; | |
de0161c0 SH |
190 | req->bounce_iov = bounce_iov; |
191 | req->read_qiov = read_qiov; | |
b5ef1aab SH |
192 | return 0; |
193 | } | |
194 | ||
e72f66a0 SH |
195 | static int process_request(IOQueue *ioq, struct iovec iov[], |
196 | unsigned int out_num, unsigned int in_num, | |
197 | unsigned int head) | |
198 | { | |
199 | VirtIOBlockDataPlane *s = container_of(ioq, VirtIOBlockDataPlane, ioqueue); | |
200 | struct iovec *in_iov = &iov[out_num]; | |
201 | struct virtio_blk_outhdr outhdr; | |
202 | QEMUIOVector *inhdr; | |
203 | size_t in_size; | |
e72f66a0 SH |
204 | |
205 | /* Copy in outhdr */ | |
206 | if (unlikely(iov_to_buf(iov, out_num, 0, &outhdr, | |
207 | sizeof(outhdr)) != sizeof(outhdr))) { | |
208 | error_report("virtio-blk request outhdr too short"); | |
209 | return -EFAULT; | |
210 | } | |
211 | iov_discard_front(&iov, &out_num, sizeof(outhdr)); | |
212 | ||
213 | /* Grab inhdr for later */ | |
214 | in_size = iov_size(in_iov, in_num); | |
215 | if (in_size < sizeof(struct virtio_blk_inhdr)) { | |
216 | error_report("virtio_blk request inhdr too short"); | |
217 | return -EFAULT; | |
218 | } | |
219 | inhdr = g_slice_new(QEMUIOVector); | |
220 | qemu_iovec_init(inhdr, 1); | |
221 | qemu_iovec_concat_iov(inhdr, in_iov, in_num, | |
222 | in_size - sizeof(struct virtio_blk_inhdr), | |
223 | sizeof(struct virtio_blk_inhdr)); | |
224 | iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr)); | |
225 | ||
226 | /* TODO Linux sets the barrier bit even when not advertised! */ | |
227 | outhdr.type &= ~VIRTIO_BLK_T_BARRIER; | |
228 | ||
229 | switch (outhdr.type) { | |
230 | case VIRTIO_BLK_T_IN: | |
b5ef1aab SH |
231 | do_rdwr_cmd(s, true, in_iov, in_num, outhdr.sector * 512, head, inhdr); |
232 | return 0; | |
e72f66a0 SH |
233 | |
234 | case VIRTIO_BLK_T_OUT: | |
b5ef1aab SH |
235 | do_rdwr_cmd(s, false, iov, out_num, outhdr.sector * 512, head, inhdr); |
236 | return 0; | |
e72f66a0 SH |
237 | |
238 | case VIRTIO_BLK_T_SCSI_CMD: | |
239 | /* TODO support SCSI commands */ | |
240 | complete_request_early(s, head, inhdr, VIRTIO_BLK_S_UNSUPP); | |
241 | return 0; | |
242 | ||
243 | case VIRTIO_BLK_T_FLUSH: | |
244 | /* TODO fdsync not supported by Linux AIO, do it synchronously here! */ | |
245 | if (qemu_fdatasync(s->fd) < 0) { | |
246 | complete_request_early(s, head, inhdr, VIRTIO_BLK_S_IOERR); | |
247 | } else { | |
248 | complete_request_early(s, head, inhdr, VIRTIO_BLK_S_OK); | |
249 | } | |
250 | return 0; | |
251 | ||
252 | case VIRTIO_BLK_T_GET_ID: | |
253 | do_get_id_cmd(s, in_iov, in_num, head, inhdr); | |
254 | return 0; | |
255 | ||
256 | default: | |
257 | error_report("virtio-blk unsupported request type %#x", outhdr.type); | |
258 | qemu_iovec_destroy(inhdr); | |
259 | g_slice_free(QEMUIOVector, inhdr); | |
260 | return -EFAULT; | |
261 | } | |
e72f66a0 SH |
262 | } |
263 | ||
2c20e711 | 264 | static void handle_notify(EventNotifier *e) |
e72f66a0 | 265 | { |
2c20e711 PB |
266 | VirtIOBlockDataPlane *s = container_of(e, VirtIOBlockDataPlane, |
267 | host_notifier); | |
e72f66a0 SH |
268 | |
269 | /* There is one array of iovecs into which all new requests are extracted | |
270 | * from the vring. Requests are read from the vring and the translated | |
271 | * descriptors are written to the iovecs array. The iovecs do not have to | |
272 | * persist across handle_notify() calls because the kernel copies the | |
273 | * iovecs on io_submit(). | |
274 | * | |
275 | * Handling io_submit() EAGAIN may require storing the requests across | |
276 | * handle_notify() calls until the kernel has sufficient resources to | |
277 | * accept more I/O. This is not implemented yet. | |
278 | */ | |
279 | struct iovec iovec[VRING_MAX]; | |
280 | struct iovec *end = &iovec[VRING_MAX]; | |
281 | struct iovec *iov = iovec; | |
282 | ||
283 | /* When a request is read from the vring, the index of the first descriptor | |
284 | * (aka head) is returned so that the completed request can be pushed onto | |
285 | * the vring later. | |
286 | * | |
287 | * The number of hypervisor read-only iovecs is out_num. The number of | |
288 | * hypervisor write-only iovecs is in_num. | |
289 | */ | |
290 | int head; | |
291 | unsigned int out_num = 0, in_num = 0; | |
292 | unsigned int num_queued; | |
293 | ||
2c20e711 | 294 | event_notifier_test_and_clear(&s->host_notifier); |
e72f66a0 SH |
295 | for (;;) { |
296 | /* Disable guest->host notifies to avoid unnecessary vmexits */ | |
297 | vring_disable_notification(s->vdev, &s->vring); | |
298 | ||
299 | for (;;) { | |
300 | head = vring_pop(s->vdev, &s->vring, iov, end, &out_num, &in_num); | |
301 | if (head < 0) { | |
302 | break; /* no more requests */ | |
303 | } | |
304 | ||
305 | trace_virtio_blk_data_plane_process_request(s, out_num, in_num, | |
306 | head); | |
307 | ||
308 | if (process_request(&s->ioqueue, iov, out_num, in_num, head) < 0) { | |
309 | vring_set_broken(&s->vring); | |
310 | break; | |
311 | } | |
312 | iov += out_num + in_num; | |
313 | } | |
314 | ||
315 | if (likely(head == -EAGAIN)) { /* vring emptied */ | |
316 | /* Re-enable guest->host notifies and stop processing the vring. | |
317 | * But if the guest has snuck in more descriptors, keep processing. | |
318 | */ | |
319 | if (vring_enable_notification(s->vdev, &s->vring)) { | |
320 | break; | |
321 | } | |
322 | } else { /* head == -ENOBUFS or fatal error, iovecs[] is depleted */ | |
323 | /* Since there are no iovecs[] left, stop processing for now. Do | |
324 | * not re-enable guest->host notifies since the I/O completion | |
325 | * handler knows to check for more vring descriptors anyway. | |
326 | */ | |
327 | break; | |
328 | } | |
329 | } | |
330 | ||
331 | num_queued = ioq_num_queued(&s->ioqueue); | |
332 | if (num_queued > 0) { | |
333 | s->num_reqs += num_queued; | |
334 | ||
335 | int rc = ioq_submit(&s->ioqueue); | |
336 | if (unlikely(rc < 0)) { | |
337 | fprintf(stderr, "ioq_submit failed %d\n", rc); | |
338 | exit(1); | |
339 | } | |
340 | } | |
341 | } | |
342 | ||
2c20e711 | 343 | static void handle_io(EventNotifier *e) |
e72f66a0 | 344 | { |
2c20e711 PB |
345 | VirtIOBlockDataPlane *s = container_of(e, VirtIOBlockDataPlane, |
346 | io_notifier); | |
e72f66a0 | 347 | |
2c20e711 | 348 | event_notifier_test_and_clear(&s->io_notifier); |
e72f66a0 SH |
349 | if (ioq_run_completion(&s->ioqueue, complete_request, s) > 0) { |
350 | notify_guest(s); | |
351 | } | |
352 | ||
353 | /* If there were more requests than iovecs, the vring will not be empty yet | |
354 | * so check again. There should now be enough resources to process more | |
355 | * requests. | |
356 | */ | |
357 | if (unlikely(vring_more_avail(&s->vring))) { | |
2c20e711 | 358 | handle_notify(&s->host_notifier); |
e72f66a0 SH |
359 | } |
360 | } | |
361 | ||
362 | static void *data_plane_thread(void *opaque) | |
363 | { | |
364 | VirtIOBlockDataPlane *s = opaque; | |
365 | ||
bf0da4df | 366 | while (!s->stopping || s->num_reqs > 0) { |
2c20e711 | 367 | aio_poll(s->ctx, true); |
bf0da4df | 368 | } |
e72f66a0 SH |
369 | return NULL; |
370 | } | |
371 | ||
372 | static void start_data_plane_bh(void *opaque) | |
373 | { | |
374 | VirtIOBlockDataPlane *s = opaque; | |
375 | ||
376 | qemu_bh_delete(s->start_bh); | |
377 | s->start_bh = NULL; | |
378 | qemu_thread_create(&s->thread, data_plane_thread, | |
379 | s, QEMU_THREAD_JOINABLE); | |
380 | } | |
381 | ||
382 | bool virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk, | |
383 | VirtIOBlockDataPlane **dataplane) | |
384 | { | |
385 | VirtIOBlockDataPlane *s; | |
386 | int fd; | |
387 | ||
388 | *dataplane = NULL; | |
389 | ||
390 | if (!blk->data_plane) { | |
391 | return true; | |
392 | } | |
393 | ||
394 | if (blk->scsi) { | |
395 | error_report("device is incompatible with x-data-plane, use scsi=off"); | |
396 | return false; | |
397 | } | |
398 | ||
399 | if (blk->config_wce) { | |
400 | error_report("device is incompatible with x-data-plane, " | |
401 | "use config-wce=off"); | |
402 | return false; | |
403 | } | |
404 | ||
b0f2027c SH |
405 | /* If dataplane is (re-)enabled while the guest is running there could be |
406 | * block jobs that can conflict. | |
407 | */ | |
408 | if (bdrv_in_use(blk->conf.bs)) { | |
409 | error_report("cannot start dataplane thread while device is in use"); | |
410 | return false; | |
411 | } | |
412 | ||
e72f66a0 SH |
413 | fd = raw_get_aio_fd(blk->conf.bs); |
414 | if (fd < 0) { | |
415 | error_report("drive is incompatible with x-data-plane, " | |
416 | "use format=raw,cache=none,aio=native"); | |
417 | return false; | |
418 | } | |
419 | ||
420 | s = g_new0(VirtIOBlockDataPlane, 1); | |
421 | s->vdev = vdev; | |
422 | s->fd = fd; | |
423 | s->blk = blk; | |
424 | ||
425 | /* Prevent block operations that conflict with data plane thread */ | |
426 | bdrv_set_in_use(blk->conf.bs, 1); | |
427 | ||
e72f66a0 SH |
428 | *dataplane = s; |
429 | return true; | |
430 | } | |
431 | ||
432 | void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s) | |
433 | { | |
434 | if (!s) { | |
435 | return; | |
436 | } | |
437 | ||
438 | virtio_blk_data_plane_stop(s); | |
e72f66a0 SH |
439 | bdrv_set_in_use(s->blk->conf.bs, 0); |
440 | g_free(s); | |
441 | } | |
442 | ||
443 | void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s) | |
444 | { | |
1c819449 FK |
445 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s->vdev))); |
446 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
e72f66a0 SH |
447 | VirtQueue *vq; |
448 | int i; | |
449 | ||
450 | if (s->started) { | |
451 | return; | |
452 | } | |
453 | ||
454 | vq = virtio_get_queue(s->vdev, 0); | |
455 | if (!vring_setup(&s->vring, s->vdev, 0)) { | |
456 | return; | |
457 | } | |
458 | ||
2c20e711 | 459 | s->ctx = aio_context_new(); |
e72f66a0 SH |
460 | |
461 | /* Set up guest notifier (irq) */ | |
1c819449 | 462 | if (k->set_guest_notifiers(qbus->parent, 1, true) != 0) { |
e72f66a0 SH |
463 | fprintf(stderr, "virtio-blk failed to set guest notifier, " |
464 | "ensure -enable-kvm is set\n"); | |
465 | exit(1); | |
466 | } | |
467 | s->guest_notifier = virtio_queue_get_guest_notifier(vq); | |
468 | ||
469 | /* Set up virtqueue notify */ | |
1c819449 | 470 | if (k->set_host_notifier(qbus->parent, 0, true) != 0) { |
e72f66a0 SH |
471 | fprintf(stderr, "virtio-blk failed to set host notifier\n"); |
472 | exit(1); | |
473 | } | |
2c20e711 | 474 | s->host_notifier = *virtio_queue_get_host_notifier(vq); |
ce689368 | 475 | aio_set_event_notifier(s->ctx, &s->host_notifier, handle_notify, NULL); |
e72f66a0 SH |
476 | |
477 | /* Set up ioqueue */ | |
478 | ioq_init(&s->ioqueue, s->fd, REQ_MAX); | |
479 | for (i = 0; i < ARRAY_SIZE(s->requests); i++) { | |
480 | ioq_put_iocb(&s->ioqueue, &s->requests[i].iocb); | |
481 | } | |
2c20e711 | 482 | s->io_notifier = *ioq_get_notifier(&s->ioqueue); |
ce689368 | 483 | aio_set_event_notifier(s->ctx, &s->io_notifier, handle_io, NULL); |
e72f66a0 SH |
484 | |
485 | s->started = true; | |
486 | trace_virtio_blk_data_plane_start(s); | |
487 | ||
488 | /* Kick right away to begin processing requests already in vring */ | |
489 | event_notifier_set(virtio_queue_get_host_notifier(vq)); | |
490 | ||
491 | /* Spawn thread in BH so it inherits iothread cpusets */ | |
492 | s->start_bh = qemu_bh_new(start_data_plane_bh, s); | |
493 | qemu_bh_schedule(s->start_bh); | |
494 | } | |
495 | ||
496 | void virtio_blk_data_plane_stop(VirtIOBlockDataPlane *s) | |
497 | { | |
1c819449 FK |
498 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s->vdev))); |
499 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); | |
cd7fdfe5 | 500 | if (!s->started || s->stopping) { |
e72f66a0 SH |
501 | return; |
502 | } | |
cd7fdfe5 | 503 | s->stopping = true; |
e72f66a0 SH |
504 | trace_virtio_blk_data_plane_stop(s); |
505 | ||
506 | /* Stop thread or cancel pending thread creation BH */ | |
507 | if (s->start_bh) { | |
508 | qemu_bh_delete(s->start_bh); | |
509 | s->start_bh = NULL; | |
510 | } else { | |
2c20e711 | 511 | aio_notify(s->ctx); |
e72f66a0 SH |
512 | qemu_thread_join(&s->thread); |
513 | } | |
514 | ||
2c20e711 | 515 | aio_set_event_notifier(s->ctx, &s->io_notifier, NULL, NULL); |
e72f66a0 SH |
516 | ioq_cleanup(&s->ioqueue); |
517 | ||
2c20e711 | 518 | aio_set_event_notifier(s->ctx, &s->host_notifier, NULL, NULL); |
1c819449 | 519 | k->set_host_notifier(qbus->parent, 0, false); |
e72f66a0 | 520 | |
2c20e711 | 521 | aio_context_unref(s->ctx); |
e72f66a0 SH |
522 | |
523 | /* Clean up guest notifier (irq) */ | |
1c819449 | 524 | k->set_guest_notifiers(qbus->parent, 1, false); |
e72f66a0 | 525 | |
9154b02c | 526 | vring_teardown(&s->vring, s->vdev, 0); |
cd7fdfe5 SH |
527 | s->started = false; |
528 | s->stopping = false; | |
e72f66a0 | 529 | } |