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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/s390/cio/vfio_ccw_ops.c
....@@ -3,13 +3,17 @@
33  * Physical device callbacks for vfio_ccw
44  *
55  * Copyright IBM Corp. 2017
6
+ * Copyright Red Hat, Inc. 2019
67  *
78  * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
89  *            Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
10
+ *            Cornelia Huck <cohuck@redhat.com>
911  */
1012 
1113 #include <linux/vfio.h>
1214 #include <linux/mdev.h>
15
+#include <linux/nospec.h>
16
+#include <linux/slab.h>
1317 
1418 #include "vfio_ccw_private.h"
1519 
....@@ -120,6 +124,11 @@
120124 	private->mdev = mdev;
121125 	private->state = VFIO_CCW_STATE_IDLE;
122126 
127
+	VFIO_CCW_MSG_EVENT(2, "mdev %pUl, sch %x.%x.%04x: create\n",
128
+			   mdev_uuid(mdev), private->sch->schid.cssid,
129
+			   private->sch->schid.ssid,
130
+			   private->sch->schid.sch_no);
131
+
123132 	return 0;
124133 }
125134 
....@@ -127,6 +136,11 @@
127136 {
128137 	struct vfio_ccw_private *private =
129138 		dev_get_drvdata(mdev_parent_dev(mdev));
139
+
140
+	VFIO_CCW_MSG_EVENT(2, "mdev %pUl, sch %x.%x.%04x: remove\n",
141
+			   mdev_uuid(mdev), private->sch->schid.cssid,
142
+			   private->sch->schid.ssid,
143
+			   private->sch->schid.sch_no);
130144 
131145 	if ((private->state != VFIO_CCW_STATE_NOT_OPER) &&
132146 	    (private->state != VFIO_CCW_STATE_STANDBY)) {
....@@ -147,11 +161,34 @@
147161 	struct vfio_ccw_private *private =
148162 		dev_get_drvdata(mdev_parent_dev(mdev));
149163 	unsigned long events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
164
+	int ret;
150165 
151166 	private->nb.notifier_call = vfio_ccw_mdev_notifier;
152167 
153
-	return vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
154
-				      &events, &private->nb);
168
+	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
169
+				     &events, &private->nb);
170
+	if (ret)
171
+		return ret;
172
+
173
+	ret = vfio_ccw_register_async_dev_regions(private);
174
+	if (ret)
175
+		goto out_unregister;
176
+
177
+	ret = vfio_ccw_register_schib_dev_regions(private);
178
+	if (ret)
179
+		goto out_unregister;
180
+
181
+	ret = vfio_ccw_register_crw_dev_regions(private);
182
+	if (ret)
183
+		goto out_unregister;
184
+
185
+	return ret;
186
+
187
+out_unregister:
188
+	vfio_ccw_unregister_dev_regions(private);
189
+	vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
190
+				 &private->nb);
191
+	return ret;
155192 }
156193 
157194 static void vfio_ccw_mdev_release(struct mdev_device *mdev)
....@@ -167,8 +204,30 @@
167204 	}
168205 
169206 	cp_free(&private->cp);
207
+	vfio_ccw_unregister_dev_regions(private);
170208 	vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
171209 				 &private->nb);
210
+}
211
+
212
+static ssize_t vfio_ccw_mdev_read_io_region(struct vfio_ccw_private *private,
213
+					    char __user *buf, size_t count,
214
+					    loff_t *ppos)
215
+{
216
+	loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
217
+	struct ccw_io_region *region;
218
+	int ret;
219
+
220
+	if (pos + count > sizeof(*region))
221
+		return -EINVAL;
222
+
223
+	mutex_lock(&private->io_mutex);
224
+	region = private->io_region;
225
+	if (copy_to_user(buf, (void *)region + pos, count))
226
+		ret = -EFAULT;
227
+	else
228
+		ret = count;
229
+	mutex_unlock(&private->io_mutex);
230
+	return ret;
172231 }
173232 
174233 static ssize_t vfio_ccw_mdev_read(struct mdev_device *mdev,
....@@ -176,18 +235,52 @@
176235 				  size_t count,
177236 				  loff_t *ppos)
178237 {
238
+	unsigned int index = VFIO_CCW_OFFSET_TO_INDEX(*ppos);
179239 	struct vfio_ccw_private *private;
180
-	struct ccw_io_region *region;
181
-
182
-	if (*ppos + count > sizeof(*region))
183
-		return -EINVAL;
184240 
185241 	private = dev_get_drvdata(mdev_parent_dev(mdev));
186
-	region = private->io_region;
187
-	if (copy_to_user(buf, (void *)region + *ppos, count))
188
-		return -EFAULT;
189242 
190
-	return count;
243
+	if (index >= VFIO_CCW_NUM_REGIONS + private->num_regions)
244
+		return -EINVAL;
245
+
246
+	switch (index) {
247
+	case VFIO_CCW_CONFIG_REGION_INDEX:
248
+		return vfio_ccw_mdev_read_io_region(private, buf, count, ppos);
249
+	default:
250
+		index -= VFIO_CCW_NUM_REGIONS;
251
+		return private->region[index].ops->read(private, buf, count,
252
+							ppos);
253
+	}
254
+
255
+	return -EINVAL;
256
+}
257
+
258
+static ssize_t vfio_ccw_mdev_write_io_region(struct vfio_ccw_private *private,
259
+					     const char __user *buf,
260
+					     size_t count, loff_t *ppos)
261
+{
262
+	loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
263
+	struct ccw_io_region *region;
264
+	int ret;
265
+
266
+	if (pos + count > sizeof(*region))
267
+		return -EINVAL;
268
+
269
+	if (!mutex_trylock(&private->io_mutex))
270
+		return -EAGAIN;
271
+
272
+	region = private->io_region;
273
+	if (copy_from_user((void *)region + pos, buf, count)) {
274
+		ret = -EFAULT;
275
+		goto out_unlock;
276
+	}
277
+
278
+	vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_IO_REQ);
279
+	ret = (region->ret_code != 0) ? region->ret_code : count;
280
+
281
+out_unlock:
282
+	mutex_unlock(&private->io_mutex);
283
+	return ret;
191284 }
192285 
193286 static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev,
....@@ -195,42 +288,47 @@
195288 				   size_t count,
196289 				   loff_t *ppos)
197290 {
291
+	unsigned int index = VFIO_CCW_OFFSET_TO_INDEX(*ppos);
198292 	struct vfio_ccw_private *private;
199
-	struct ccw_io_region *region;
200
-
201
-	if (*ppos + count > sizeof(*region))
202
-		return -EINVAL;
203293 
204294 	private = dev_get_drvdata(mdev_parent_dev(mdev));
205
-	if (private->state != VFIO_CCW_STATE_IDLE)
206
-		return -EACCES;
207295 
208
-	region = private->io_region;
209
-	if (copy_from_user((void *)region + *ppos, buf, count))
210
-		return -EFAULT;
296
+	if (index >= VFIO_CCW_NUM_REGIONS + private->num_regions)
297
+		return -EINVAL;
211298 
212
-	vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_IO_REQ);
213
-	if (region->ret_code != 0) {
214
-		private->state = VFIO_CCW_STATE_IDLE;
215
-		return region->ret_code;
299
+	switch (index) {
300
+	case VFIO_CCW_CONFIG_REGION_INDEX:
301
+		return vfio_ccw_mdev_write_io_region(private, buf, count, ppos);
302
+	default:
303
+		index -= VFIO_CCW_NUM_REGIONS;
304
+		return private->region[index].ops->write(private, buf, count,
305
+							 ppos);
216306 	}
217307 
218
-	return count;
308
+	return -EINVAL;
219309 }
220310 
221
-static int vfio_ccw_mdev_get_device_info(struct vfio_device_info *info)
311
+static int vfio_ccw_mdev_get_device_info(struct vfio_device_info *info,
312
+					 struct mdev_device *mdev)
222313 {
314
+	struct vfio_ccw_private *private;
315
+
316
+	private = dev_get_drvdata(mdev_parent_dev(mdev));
223317 	info->flags = VFIO_DEVICE_FLAGS_CCW | VFIO_DEVICE_FLAGS_RESET;
224
-	info->num_regions = VFIO_CCW_NUM_REGIONS;
318
+	info->num_regions = VFIO_CCW_NUM_REGIONS + private->num_regions;
225319 	info->num_irqs = VFIO_CCW_NUM_IRQS;
226320 
227321 	return 0;
228322 }
229323 
230324 static int vfio_ccw_mdev_get_region_info(struct vfio_region_info *info,
231
-					 u16 *cap_type_id,
232
-					 void **cap_type)
325
+					 struct mdev_device *mdev,
326
+					 unsigned long arg)
233327 {
328
+	struct vfio_ccw_private *private;
329
+	int i;
330
+
331
+	private = dev_get_drvdata(mdev_parent_dev(mdev));
234332 	switch (info->index) {
235333 	case VFIO_CCW_CONFIG_REGION_INDEX:
236334 		info->offset = 0;
....@@ -238,24 +336,75 @@
238336 		info->flags = VFIO_REGION_INFO_FLAG_READ
239337 			      | VFIO_REGION_INFO_FLAG_WRITE;
240338 		return 0;
241
-	default:
242
-		return -EINVAL;
339
+	default: /* all other regions are handled via capability chain */
340
+	{
341
+		struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
342
+		struct vfio_region_info_cap_type cap_type = {
343
+			.header.id = VFIO_REGION_INFO_CAP_TYPE,
344
+			.header.version = 1 };
345
+		int ret;
346
+
347
+		if (info->index >=
348
+		    VFIO_CCW_NUM_REGIONS + private->num_regions)
349
+			return -EINVAL;
350
+
351
+		info->index = array_index_nospec(info->index,
352
+						 VFIO_CCW_NUM_REGIONS +
353
+						 private->num_regions);
354
+
355
+		i = info->index - VFIO_CCW_NUM_REGIONS;
356
+
357
+		info->offset = VFIO_CCW_INDEX_TO_OFFSET(info->index);
358
+		info->size = private->region[i].size;
359
+		info->flags = private->region[i].flags;
360
+
361
+		cap_type.type = private->region[i].type;
362
+		cap_type.subtype = private->region[i].subtype;
363
+
364
+		ret = vfio_info_add_capability(&caps, &cap_type.header,
365
+					       sizeof(cap_type));
366
+		if (ret)
367
+			return ret;
368
+
369
+		info->flags |= VFIO_REGION_INFO_FLAG_CAPS;
370
+		if (info->argsz < sizeof(*info) + caps.size) {
371
+			info->argsz = sizeof(*info) + caps.size;
372
+			info->cap_offset = 0;
373
+		} else {
374
+			vfio_info_cap_shift(&caps, sizeof(*info));
375
+			if (copy_to_user((void __user *)arg + sizeof(*info),
376
+					 caps.buf, caps.size)) {
377
+				kfree(caps.buf);
378
+				return -EFAULT;
379
+			}
380
+			info->cap_offset = sizeof(*info);
381
+		}
382
+
383
+		kfree(caps.buf);
384
+
243385 	}
386
+	}
387
+	return 0;
244388 }
245389 
246390 static int vfio_ccw_mdev_get_irq_info(struct vfio_irq_info *info)
247391 {
248
-	if (info->index != VFIO_CCW_IO_IRQ_INDEX)
392
+	switch (info->index) {
393
+	case VFIO_CCW_IO_IRQ_INDEX:
394
+	case VFIO_CCW_CRW_IRQ_INDEX:
395
+		info->count = 1;
396
+		info->flags = VFIO_IRQ_INFO_EVENTFD;
397
+		break;
398
+	default:
249399 		return -EINVAL;
250
-
251
-	info->count = 1;
252
-	info->flags = VFIO_IRQ_INFO_EVENTFD;
400
+	}
253401 
254402 	return 0;
255403 }
256404 
257405 static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
258406 				  uint32_t flags,
407
+				  uint32_t index,
259408 				  void __user *data)
260409 {
261410 	struct vfio_ccw_private *private;
....@@ -265,7 +414,17 @@
265414 		return -EINVAL;
266415 
267416 	private = dev_get_drvdata(mdev_parent_dev(mdev));
268
-	ctx = &private->io_trigger;
417
+
418
+	switch (index) {
419
+	case VFIO_CCW_IO_IRQ_INDEX:
420
+		ctx = &private->io_trigger;
421
+		break;
422
+	case VFIO_CCW_CRW_IRQ_INDEX:
423
+		ctx = &private->crw_trigger;
424
+		break;
425
+	default:
426
+		return -EINVAL;
427
+	}
269428 
270429 	switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
271430 	case VFIO_IRQ_SET_DATA_NONE:
....@@ -317,6 +476,43 @@
317476 	}
318477 }
319478 
479
+int vfio_ccw_register_dev_region(struct vfio_ccw_private *private,
480
+				 unsigned int subtype,
481
+				 const struct vfio_ccw_regops *ops,
482
+				 size_t size, u32 flags, void *data)
483
+{
484
+	struct vfio_ccw_region *region;
485
+
486
+	region = krealloc(private->region,
487
+			  (private->num_regions + 1) * sizeof(*region),
488
+			  GFP_KERNEL);
489
+	if (!region)
490
+		return -ENOMEM;
491
+
492
+	private->region = region;
493
+	private->region[private->num_regions].type = VFIO_REGION_TYPE_CCW;
494
+	private->region[private->num_regions].subtype = subtype;
495
+	private->region[private->num_regions].ops = ops;
496
+	private->region[private->num_regions].size = size;
497
+	private->region[private->num_regions].flags = flags;
498
+	private->region[private->num_regions].data = data;
499
+
500
+	private->num_regions++;
501
+
502
+	return 0;
503
+}
504
+
505
+void vfio_ccw_unregister_dev_regions(struct vfio_ccw_private *private)
506
+{
507
+	int i;
508
+
509
+	for (i = 0; i < private->num_regions; i++)
510
+		private->region[i].ops->release(private, &private->region[i]);
511
+	private->num_regions = 0;
512
+	kfree(private->region);
513
+	private->region = NULL;
514
+}
515
+
320516 static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
321517 				   unsigned int cmd,
322518 				   unsigned long arg)
....@@ -337,7 +533,7 @@
337533 		if (info.argsz < minsz)
338534 			return -EINVAL;
339535 
340
-		ret = vfio_ccw_mdev_get_device_info(&info);
536
+		ret = vfio_ccw_mdev_get_device_info(&info, mdev);
341537 		if (ret)
342538 			return ret;
343539 
....@@ -346,8 +542,6 @@
346542 	case VFIO_DEVICE_GET_REGION_INFO:
347543 	{
348544 		struct vfio_region_info info;
349
-		u16 cap_type_id = 0;
350
-		void *cap_type = NULL;
351545 
352546 		minsz = offsetofend(struct vfio_region_info, offset);
353547 
....@@ -357,8 +551,7 @@
357551 		if (info.argsz < minsz)
358552 			return -EINVAL;
359553 
360
-		ret = vfio_ccw_mdev_get_region_info(&info, &cap_type_id,
361
-						    &cap_type);
554
+		ret = vfio_ccw_mdev_get_region_info(&info, mdev, arg);
362555 		if (ret)
363556 			return ret;
364557 
....@@ -403,7 +596,7 @@
403596 			return ret;
404597 
405598 		data = (void __user *)(arg + minsz);
406
-		return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, data);
599
+		return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, hdr.index, data);
407600 	}
408601 	case VFIO_DEVICE_RESET:
409602 		return vfio_ccw_mdev_reset(mdev);