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1 /*
2 * vfio based subchannel assignment support
3 *
4 * Copyright 2017 IBM Corp.
5 * Copyright 2019 Red Hat, Inc.
6 *
7 * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
8 * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
9 * Pierre Morel <pmorel@linux.vnet.ibm.com>
10 * Cornelia Huck <cohuck@redhat.com>
11 *
12 * This work is licensed under the terms of the GNU GPL, version 2 or (at
13 * your option) any later version. See the COPYING file in the top-level
14 * directory.
15 */
16
17 #include "qemu/osdep.h"
18 #include <linux/vfio.h>
19 #include <linux/vfio_ccw.h>
20 #include <sys/ioctl.h>
21
22 #include "qapi/error.h"
23 #include "hw/vfio/vfio-device.h"
24 #include "system/iommufd.h"
25 #include "hw/s390x/s390-ccw.h"
26 #include "hw/s390x/vfio-ccw.h"
27 #include "hw/core/qdev-properties.h"
28 #include "hw/s390x/ccw-device.h"
29 #include "system/address-spaces.h"
30 #include "qemu/error-report.h"
31 #include "qemu/main-loop.h"
32 #include "qemu/module.h"
33
34 struct VFIOCCWDevice {
35 S390CCWDevice cdev;
36 VFIODevice vdev;
37 uint64_t io_region_size;
38 uint64_t io_region_offset;
39 struct ccw_io_region *io_region;
40 uint64_t async_cmd_region_size;
41 uint64_t async_cmd_region_offset;
42 struct ccw_cmd_region *async_cmd_region;
43 uint64_t schib_region_size;
44 uint64_t schib_region_offset;
45 struct ccw_schib_region *schib_region;
46 uint64_t crw_region_size;
47 uint64_t crw_region_offset;
48 struct ccw_crw_region *crw_region;
49 EventNotifier io_notifier;
50 EventNotifier crw_notifier;
51 EventNotifier req_notifier;
52 bool force_orb_pfch;
53 };
54
55 static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
56 {
57 vdev->needs_reset = false;
58 }
59
60 /*
61 * We don't need vfio_hot_reset_multi and vfio_eoi operations for
62 * vfio_ccw device now.
63 */
64 struct VFIODeviceOps vfio_ccw_ops = {
65 .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
66 };
67
68 static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
69 {
70 VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
71 struct ccw_io_region *region = vcdev->io_region;
72 int ret;
73
74 if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH) && vcdev->force_orb_pfch) {
75 sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
76 warn_report_once("vfio-ccw (devno %x.%x.%04x): PFCH flag forced",
77 sch->cssid, sch->ssid, sch->devno);
78 }
79
80 QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
81 QEMU_BUILD_BUG_ON(sizeof(region->scsw_area) != sizeof(SCSW));
82 QEMU_BUILD_BUG_ON(sizeof(region->irb_area) != sizeof(IRB));
83
84 memset(region, 0, sizeof(*region));
85
86 memcpy(region->orb_area, &sch->orb, sizeof(ORB));
87 memcpy(region->scsw_area, &sch->curr_status.scsw, sizeof(SCSW));
88
89 again:
90 ret = pwrite(vcdev->vdev.fd, region,
91 vcdev->io_region_size, vcdev->io_region_offset);
92 if (ret != vcdev->io_region_size) {
93 if (errno == EAGAIN) {
94 goto again;
95 }
96 error_report("vfio-ccw: write I/O region failed with errno=%d", errno);
97 ret = errno ? -errno : -EFAULT;
98 } else {
99 ret = 0;
100 }
101 switch (ret) {
102 case 0:
103 return IOINST_CC_EXPECTED;
104 case -EBUSY:
105 return IOINST_CC_BUSY;
106 case -ENODEV:
107 case -EACCES:
108 return IOINST_CC_NOT_OPERATIONAL;
109 case -EFAULT:
110 default:
111 sch_gen_unit_exception(sch);
112 css_inject_io_interrupt(sch);
113 return IOINST_CC_EXPECTED;
114 }
115 }
116
117 static IOInstEnding vfio_ccw_handle_store(SubchDev *sch)
118 {
119 VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
120 SCHIB *schib = &sch->curr_status;
121 struct ccw_schib_region *region = vcdev->schib_region;
122 SCHIB *s;
123 int ret;
124
125 /* schib region not available so nothing else to do */
126 if (!region) {
127 return IOINST_CC_EXPECTED;
128 }
129
130 memset(region, 0, sizeof(*region));
131 ret = pread(vcdev->vdev.fd, region, vcdev->schib_region_size,
132 vcdev->schib_region_offset);
133
134 if (ret == -1) {
135 /*
136 * Device is probably damaged, but store subchannel does not
137 * have a nonzero cc defined for this scenario. Log an error,
138 * and presume things are otherwise fine.
139 */
140 error_report("vfio-ccw: store region read failed with errno=%d", errno);
141 return IOINST_CC_EXPECTED;
142 }
143
144 /*
145 * Selectively copy path-related bits of the SCHIB,
146 * rather than copying the entire struct.
147 */
148 s = (SCHIB *)region->schib_area;
149 schib->pmcw.pnom = s->pmcw.pnom;
150 schib->pmcw.lpum = s->pmcw.lpum;
151 schib->pmcw.pam = s->pmcw.pam;
152 schib->pmcw.pom = s->pmcw.pom;
153
154 if (s->scsw.flags & SCSW_FLAGS_MASK_PNO) {
155 schib->scsw.flags |= SCSW_FLAGS_MASK_PNO;
156 }
157
158 return IOINST_CC_EXPECTED;
159 }
160
161 static int vfio_ccw_handle_clear(SubchDev *sch)
162 {
163 VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
164 struct ccw_cmd_region *region = vcdev->async_cmd_region;
165 int ret;
166
167 if (!vcdev->async_cmd_region) {
168 /* Async command region not available, fall back to emulation */
169 return -ENOSYS;
170 }
171
172 memset(region, 0, sizeof(*region));
173 region->command = VFIO_CCW_ASYNC_CMD_CSCH;
174
175 again:
176 ret = pwrite(vcdev->vdev.fd, region,
177 vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
178 if (ret != vcdev->async_cmd_region_size) {
179 if (errno == EAGAIN) {
180 goto again;
181 }
182 error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
183 ret = errno ? -errno : -EFAULT;
184 } else {
185 ret = 0;
186 }
187 switch (ret) {
188 case 0:
189 case -ENODEV:
190 case -EACCES:
191 return ret;
192 case -EFAULT:
193 default:
194 sch_gen_unit_exception(sch);
195 css_inject_io_interrupt(sch);
196 return 0;
197 }
198 }
199
200 static int vfio_ccw_handle_halt(SubchDev *sch)
201 {
202 VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
203 struct ccw_cmd_region *region = vcdev->async_cmd_region;
204 int ret;
205
206 if (!vcdev->async_cmd_region) {
207 /* Async command region not available, fall back to emulation */
208 return -ENOSYS;
209 }
210
211 memset(region, 0, sizeof(*region));
212 region->command = VFIO_CCW_ASYNC_CMD_HSCH;
213
214 again:
215 ret = pwrite(vcdev->vdev.fd, region,
216 vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
217 if (ret != vcdev->async_cmd_region_size) {
218 if (errno == EAGAIN) {
219 goto again;
220 }
221 error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
222 ret = errno ? -errno : -EFAULT;
223 } else {
224 ret = 0;
225 }
226 switch (ret) {
227 case 0:
228 case -EBUSY:
229 case -ENODEV:
230 case -EACCES:
231 return ret;
232 case -EFAULT:
233 default:
234 sch_gen_unit_exception(sch);
235 css_inject_io_interrupt(sch);
236 return 0;
237 }
238 }
239
240 static void vfio_ccw_reset(DeviceState *dev)
241 {
242 VFIOCCWDevice *vcdev = VFIO_CCW(dev);
243
244 ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
245 }
246
247 static void vfio_ccw_crw_read(VFIOCCWDevice *vcdev)
248 {
249 struct ccw_crw_region *region = vcdev->crw_region;
250 CRW crw;
251 int size;
252
253 /* Keep reading CRWs as long as data is returned */
254 do {
255 memset(region, 0, sizeof(*region));
256 size = pread(vcdev->vdev.fd, region, vcdev->crw_region_size,
257 vcdev->crw_region_offset);
258
259 if (size == -1) {
260 error_report("vfio-ccw: Read crw region failed with errno=%d",
261 errno);
262 break;
263 }
264
265 if (region->crw == 0) {
266 /* No more CRWs to queue */
267 break;
268 }
269
270 memcpy(&crw, &region->crw, sizeof(CRW));
271
272 css_crw_add_to_queue(crw);
273 } while (1);
274 }
275
276 static void vfio_ccw_req_notifier_handler(void *opaque)
277 {
278 VFIOCCWDevice *vcdev = opaque;
279 Error *err = NULL;
280
281 if (!event_notifier_test_and_clear(&vcdev->req_notifier)) {
282 return;
283 }
284
285 qdev_unplug(DEVICE(vcdev), &err);
286 if (err) {
287 warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
288 }
289 }
290
291 static void vfio_ccw_crw_notifier_handler(void *opaque)
292 {
293 VFIOCCWDevice *vcdev = opaque;
294
295 while (event_notifier_test_and_clear(&vcdev->crw_notifier)) {
296 vfio_ccw_crw_read(vcdev);
297 }
298 }
299
300 static void vfio_ccw_io_notifier_handler(void *opaque)
301 {
302 VFIOCCWDevice *vcdev = opaque;
303 struct ccw_io_region *region = vcdev->io_region;
304 CcwDevice *ccw_dev = CCW_DEVICE(vcdev);
305 SubchDev *sch = ccw_dev->sch;
306 SCHIB *schib = &sch->curr_status;
307 SCSW s;
308 IRB irb;
309 ESW esw;
310 int size;
311
312 if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
313 return;
314 }
315
316 size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
317 vcdev->io_region_offset);
318 if (size == -1) {
319 switch (errno) {
320 case ENODEV:
321 /* Generate a deferred cc 3 condition. */
322 schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
323 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
324 schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
325 goto read_err;
326 case EFAULT:
327 /* Memory problem, generate channel data check. */
328 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
329 schib->scsw.cstat = SCSW_CSTAT_DATA_CHECK;
330 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
331 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
332 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
333 goto read_err;
334 default:
335 /* Error, generate channel program check. */
336 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
337 schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
338 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
339 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
340 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
341 goto read_err;
342 }
343 } else if (size != vcdev->io_region_size) {
344 /* Information transfer error, generate channel-control check. */
345 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
346 schib->scsw.cstat = SCSW_CSTAT_CHN_CTRL_CHK;
347 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
348 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
349 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
350 goto read_err;
351 }
352
353 memcpy(&irb, region->irb_area, sizeof(IRB));
354
355 /* Update control block via irb. */
356 s = schib->scsw;
357 copy_scsw_to_guest(&s, &irb.scsw);
358 schib->scsw = s;
359
360 copy_esw_to_guest(&esw, &irb.esw);
361 sch->esw = esw;
362
363 /* If a uint check is pending, copy sense data. */
364 if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
365 (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
366 memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
367 }
368
369 read_err:
370 css_inject_io_interrupt(sch);
371 }
372
373 static bool vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
374 unsigned int irq,
375 Error **errp)
376 {
377 VFIODevice *vdev = &vcdev->vdev;
378 struct vfio_irq_info irq_info;
379 int ret;
380 int fd;
381 EventNotifier *notifier;
382 IOHandler *fd_read;
383
384 switch (irq) {
385 case VFIO_CCW_IO_IRQ_INDEX:
386 notifier = &vcdev->io_notifier;
387 fd_read = vfio_ccw_io_notifier_handler;
388 break;
389 case VFIO_CCW_CRW_IRQ_INDEX:
390 notifier = &vcdev->crw_notifier;
391 fd_read = vfio_ccw_crw_notifier_handler;
392 break;
393 case VFIO_CCW_REQ_IRQ_INDEX:
394 notifier = &vcdev->req_notifier;
395 fd_read = vfio_ccw_req_notifier_handler;
396 break;
397 default:
398 error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
399 return false;
400 }
401
402 if (vdev->num_irqs < irq + 1) {
403 error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
404 irq, vdev->num_irqs);
405 return false;
406 }
407
408 ret = vfio_device_get_irq_info(vdev, irq, &irq_info);
409
410 if (ret < 0) {
411 error_setg_errno(errp, -ret, "vfio: Error getting irq info");
412 return false;
413 }
414
415 if (irq_info.count < 1) {
416 error_setg(errp, "vfio: Error getting irq info, count=0");
417 return false;
418 }
419
420 if (event_notifier_init(notifier, 0) < 0) {
421 error_setg_errno(errp, errno,
422 "vfio: Unable to init event notifier for irq (%d)",
423 irq);
424 return false;
425 }
426
427 fd = event_notifier_get_fd(notifier);
428 qemu_set_fd_handler(fd, fd_read, NULL, vcdev);
429
430 if (!vfio_device_irq_set_signaling(vdev, irq, 0,
431 VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
432 qemu_set_fd_handler(fd, NULL, NULL, vcdev);
433 event_notifier_cleanup(notifier);
434 return false;
435 }
436
437 return true;
438 }
439
440 static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
441 unsigned int irq)
442 {
443 Error *err = NULL;
444 EventNotifier *notifier;
445
446 switch (irq) {
447 case VFIO_CCW_IO_IRQ_INDEX:
448 notifier = &vcdev->io_notifier;
449 break;
450 case VFIO_CCW_CRW_IRQ_INDEX:
451 notifier = &vcdev->crw_notifier;
452 break;
453 case VFIO_CCW_REQ_IRQ_INDEX:
454 notifier = &vcdev->req_notifier;
455 break;
456 default:
457 error_report("vfio: Unsupported device irq(%d)", irq);
458 return;
459 }
460
461 if (!vfio_device_irq_set_signaling(&vcdev->vdev, irq, 0,
462 VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
463 warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
464 }
465
466 qemu_set_fd_handler(event_notifier_get_fd(notifier),
467 NULL, NULL, vcdev);
468 event_notifier_cleanup(notifier);
469 }
470
471 static bool vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
472 {
473 VFIODevice *vdev = &vcdev->vdev;
474 struct vfio_region_info *info;
475 int ret;
476
477 /* Sanity check device */
478 if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
479 error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
480 return false;
481 }
482
483 /*
484 * We always expect at least the I/O region to be present. We also
485 * may have a variable number of regions governed by capabilities.
486 */
487 if (vdev->num_initial_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
488 error_setg(errp, "vfio: too few regions (%u), expected at least %u",
489 vdev->num_initial_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
490 return false;
491 }
492
493 ret = vfio_device_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
494 if (ret) {
495 error_setg_errno(errp, -ret, "vfio: Error getting config info");
496 return false;
497 }
498
499 vcdev->io_region_size = info->size;
500 if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
501 error_setg(errp, "vfio: Unexpected size of the I/O region");
502 goto out_err;
503 }
504
505 vcdev->io_region_offset = info->offset;
506 vcdev->io_region = g_malloc0(info->size);
507
508 /* check for the optional async command region */
509 ret = vfio_device_get_region_info_type(vdev, VFIO_REGION_TYPE_CCW,
510 VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &info);
511 if (!ret) {
512 vcdev->async_cmd_region_size = info->size;
513 if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
514 error_setg(errp, "vfio: Unexpected size of the async cmd region");
515 goto out_err;
516 }
517 vcdev->async_cmd_region_offset = info->offset;
518 vcdev->async_cmd_region = g_malloc0(info->size);
519 }
520
521 ret = vfio_device_get_region_info_type(vdev, VFIO_REGION_TYPE_CCW,
522 VFIO_REGION_SUBTYPE_CCW_SCHIB, &info);
523 if (!ret) {
524 vcdev->schib_region_size = info->size;
525 if (sizeof(*vcdev->schib_region) != vcdev->schib_region_size) {
526 error_setg(errp, "vfio: Unexpected size of the schib region");
527 goto out_err;
528 }
529 vcdev->schib_region_offset = info->offset;
530 vcdev->schib_region = g_malloc(info->size);
531 }
532
533 ret = vfio_device_get_region_info_type(vdev, VFIO_REGION_TYPE_CCW,
534 VFIO_REGION_SUBTYPE_CCW_CRW, &info);
535
536 if (!ret) {
537 vcdev->crw_region_size = info->size;
538 if (sizeof(*vcdev->crw_region) != vcdev->crw_region_size) {
539 error_setg(errp, "vfio: Unexpected size of the CRW region");
540 goto out_err;
541 }
542 vcdev->crw_region_offset = info->offset;
543 vcdev->crw_region = g_malloc(info->size);
544 }
545
546 return true;
547
548 out_err:
549 g_free(vcdev->crw_region);
550 g_free(vcdev->schib_region);
551 g_free(vcdev->async_cmd_region);
552 g_free(vcdev->io_region);
553 return false;
554 }
555
556 static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
557 {
558 g_free(vcdev->crw_region);
559 g_free(vcdev->schib_region);
560 g_free(vcdev->async_cmd_region);
561 g_free(vcdev->io_region);
562 }
563
564 static void vfio_ccw_realize(DeviceState *dev, Error **errp)
565 {
566 S390CCWDevice *cdev = S390_CCW_DEVICE(dev);
567 VFIOCCWDevice *vcdev = VFIO_CCW(cdev);
568 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
569 VFIODevice *vbasedev = &vcdev->vdev;
570 Error *err = NULL;
571
572 /* Call the class init function for subchannel. */
573 if (cdc->realize) {
574 if (!cdc->realize(cdev, vcdev->vdev.sysfsdev, errp)) {
575 return;
576 }
577 }
578
579 if (!vfio_device_get_name(vbasedev, errp)) {
580 goto out_unrealize;
581 }
582
583 if (!vfio_device_attach(cdev->mdevid, vbasedev,
584 &address_space_memory, errp)) {
585 goto out_attach_dev_err;
586 }
587
588 if (!vfio_ccw_get_region(vcdev, errp)) {
589 goto out_region_err;
590 }
591
592 if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, errp)) {
593 goto out_io_notifier_err;
594 }
595
596 if (vcdev->crw_region) {
597 if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX,
598 errp)) {
599 goto out_irq_notifier_err;
600 }
601 }
602
603 if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX, &err)) {
604 /*
605 * Report this error, but do not make it a failing condition.
606 * Lack of this IRQ in the host does not prevent normal operation.
607 */
608 warn_report_err(err);
609 }
610
611 return;
612
613 out_irq_notifier_err:
614 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
615 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
616 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
617 out_io_notifier_err:
618 vfio_ccw_put_region(vcdev);
619 out_region_err:
620 vfio_device_detach(vbasedev);
621 out_attach_dev_err:
622 vfio_device_free_name(vbasedev);
623 out_unrealize:
624 if (cdc->unrealize) {
625 cdc->unrealize(cdev);
626 }
627 }
628
629 static void vfio_ccw_unrealize(DeviceState *dev)
630 {
631 S390CCWDevice *cdev = S390_CCW_DEVICE(dev);
632 VFIOCCWDevice *vcdev = VFIO_CCW(cdev);
633 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
634
635 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
636 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
637 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
638 vfio_ccw_put_region(vcdev);
639 vfio_device_detach(&vcdev->vdev);
640 vfio_device_free_name(&vcdev->vdev);
641
642 if (cdc->unrealize) {
643 cdc->unrealize(cdev);
644 }
645 }
646
647 static const Property vfio_ccw_properties[] = {
648 DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
649 DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
650 DEFINE_PROP_LINK("iommufd", VFIOCCWDevice, vdev.iommufd,
651 TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *),
652 DEFINE_PROP_CCW_LOADPARM("loadparm", CcwDevice, loadparm),
653 };
654
655 static const VMStateDescription vfio_ccw_vmstate = {
656 .name = "vfio-ccw",
657 .unmigratable = 1,
658 };
659
660 static void vfio_ccw_instance_init(Object *obj)
661 {
662 VFIOCCWDevice *vcdev = VFIO_CCW(obj);
663 VFIODevice *vbasedev = &vcdev->vdev;
664
665 /* CCW device is mdev type device */
666 vbasedev->mdev = true;
667
668 /*
669 * All vfio-ccw devices are believed to operate in a way compatible with
670 * discarding of memory in RAM blocks, ie. pages pinned in the host are
671 * in the current working set of the guest driver and therefore never
672 * overlap e.g., with pages available to the guest balloon driver. This
673 * needs to be set before vfio_get_device() for vfio common to handle
674 * ram_block_discard_disable().
675 */
676 vfio_device_init(vbasedev, VFIO_DEVICE_TYPE_CCW, &vfio_ccw_ops,
677 DEVICE(vcdev), true);
678 }
679
680 static void vfio_ccw_set_fd(Object *obj, const char *str, Error **errp)
681 {
682 vfio_device_set_fd(&VFIO_CCW(obj)->vdev, str, errp);
683 }
684
685 static void vfio_ccw_class_init(ObjectClass *klass, const void *data)
686 {
687 DeviceClass *dc = DEVICE_CLASS(klass);
688 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
689
690 device_class_set_props(dc, vfio_ccw_properties);
691 object_class_property_add_str(klass, "fd", NULL, vfio_ccw_set_fd);
692 dc->vmsd = &vfio_ccw_vmstate;
693 dc->desc = "VFIO-based subchannel assignment";
694 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
695 dc->realize = vfio_ccw_realize;
696 dc->unrealize = vfio_ccw_unrealize;
697 device_class_set_legacy_reset(dc, vfio_ccw_reset);
698
699 cdc->handle_request = vfio_ccw_handle_request;
700 cdc->handle_halt = vfio_ccw_handle_halt;
701 cdc->handle_clear = vfio_ccw_handle_clear;
702 cdc->handle_store = vfio_ccw_handle_store;
703
704 object_class_property_set_description(klass, /* 2.10 */
705 "sysfsdev",
706 "Host sysfs path of assigned device");
707 object_class_property_set_description(klass, /* 3.0 */
708 "force-orb-pfch",
709 "Force unlimited prefetch");
710 object_class_property_set_description(klass, /* 9.0 */
711 "iommufd",
712 "Set host IOMMUFD backend device");
713 object_class_property_set_description(klass, /* 9.2 */
714 "loadparm",
715 "Define which devices that can be used for booting");
716 }
717
718 static const TypeInfo vfio_ccw_info = {
719 .name = TYPE_VFIO_CCW,
720 .parent = TYPE_S390_CCW,
721 .instance_size = sizeof(VFIOCCWDevice),
722 .instance_init = vfio_ccw_instance_init,
723 .class_init = vfio_ccw_class_init,
724 };
725
726 static void register_vfio_ccw_type(void)
727 {
728 type_register_static(&vfio_ccw_info);
729 }
730
731 type_init(register_vfio_ccw_type)