xref: /openbmc/linux/drivers/gpu/drm/i915/gvt/kvmgt.c (revision 7bcae826)
1 /*
2  * KVMGT - the implementation of Intel mediated pass-through framework for KVM
3  *
4  * Copyright(c) 2014-2016 Intel Corporation. All rights reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice (including the next
14  * paragraph) shall be included in all copies or substantial portions of the
15  * Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23  * SOFTWARE.
24  *
25  * Authors:
26  *    Kevin Tian <kevin.tian@intel.com>
27  *    Jike Song <jike.song@intel.com>
28  *    Xiaoguang Chen <xiaoguang.chen@intel.com>
29  */
30 
31 #include <linux/init.h>
32 #include <linux/device.h>
33 #include <linux/mm.h>
34 #include <linux/mmu_context.h>
35 #include <linux/types.h>
36 #include <linux/list.h>
37 #include <linux/rbtree.h>
38 #include <linux/spinlock.h>
39 #include <linux/eventfd.h>
40 #include <linux/uuid.h>
41 #include <linux/kvm_host.h>
42 #include <linux/vfio.h>
43 #include <linux/mdev.h>
44 
45 #include "i915_drv.h"
46 #include "gvt.h"
47 
48 static const struct intel_gvt_ops *intel_gvt_ops;
49 
50 /* helper macros copied from vfio-pci */
51 #define VFIO_PCI_OFFSET_SHIFT   40
52 #define VFIO_PCI_OFFSET_TO_INDEX(off)   (off >> VFIO_PCI_OFFSET_SHIFT)
53 #define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
54 #define VFIO_PCI_OFFSET_MASK    (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
55 
56 struct vfio_region {
57 	u32				type;
58 	u32				subtype;
59 	size_t				size;
60 	u32				flags;
61 };
62 
63 struct kvmgt_pgfn {
64 	gfn_t gfn;
65 	struct hlist_node hnode;
66 };
67 
68 struct kvmgt_guest_info {
69 	struct kvm *kvm;
70 	struct intel_vgpu *vgpu;
71 	struct kvm_page_track_notifier_node track_node;
72 #define NR_BKT (1 << 18)
73 	struct hlist_head ptable[NR_BKT];
74 #undef NR_BKT
75 };
76 
77 struct gvt_dma {
78 	struct rb_node node;
79 	gfn_t gfn;
80 	unsigned long iova;
81 };
82 
83 static inline bool handle_valid(unsigned long handle)
84 {
85 	return !!(handle & ~0xff);
86 }
87 
88 static int kvmgt_guest_init(struct mdev_device *mdev);
89 static void intel_vgpu_release_work(struct work_struct *work);
90 static bool kvmgt_guest_exit(struct kvmgt_guest_info *info);
91 
92 static int gvt_dma_map_iova(struct intel_vgpu *vgpu, kvm_pfn_t pfn,
93 		unsigned long *iova)
94 {
95 	struct page *page;
96 	struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
97 	dma_addr_t daddr;
98 
99 	page = pfn_to_page(pfn);
100 	if (is_error_page(page))
101 		return -EFAULT;
102 
103 	daddr = dma_map_page(dev, page, 0, PAGE_SIZE,
104 			PCI_DMA_BIDIRECTIONAL);
105 	if (dma_mapping_error(dev, daddr))
106 		return -ENOMEM;
107 
108 	*iova = (unsigned long)(daddr >> PAGE_SHIFT);
109 	return 0;
110 }
111 
112 static void gvt_dma_unmap_iova(struct intel_vgpu *vgpu, unsigned long iova)
113 {
114 	struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
115 	dma_addr_t daddr;
116 
117 	daddr = (dma_addr_t)(iova << PAGE_SHIFT);
118 	dma_unmap_page(dev, daddr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
119 }
120 
121 static struct gvt_dma *__gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)
122 {
123 	struct rb_node *node = vgpu->vdev.cache.rb_node;
124 	struct gvt_dma *ret = NULL;
125 
126 	while (node) {
127 		struct gvt_dma *itr = rb_entry(node, struct gvt_dma, node);
128 
129 		if (gfn < itr->gfn)
130 			node = node->rb_left;
131 		else if (gfn > itr->gfn)
132 			node = node->rb_right;
133 		else {
134 			ret = itr;
135 			goto out;
136 		}
137 	}
138 
139 out:
140 	return ret;
141 }
142 
143 static unsigned long gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)
144 {
145 	struct gvt_dma *entry;
146 	unsigned long iova;
147 
148 	mutex_lock(&vgpu->vdev.cache_lock);
149 
150 	entry = __gvt_cache_find(vgpu, gfn);
151 	iova = (entry == NULL) ? INTEL_GVT_INVALID_ADDR : entry->iova;
152 
153 	mutex_unlock(&vgpu->vdev.cache_lock);
154 	return iova;
155 }
156 
157 static void gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
158 		unsigned long iova)
159 {
160 	struct gvt_dma *new, *itr;
161 	struct rb_node **link = &vgpu->vdev.cache.rb_node, *parent = NULL;
162 
163 	new = kzalloc(sizeof(struct gvt_dma), GFP_KERNEL);
164 	if (!new)
165 		return;
166 
167 	new->gfn = gfn;
168 	new->iova = iova;
169 
170 	mutex_lock(&vgpu->vdev.cache_lock);
171 	while (*link) {
172 		parent = *link;
173 		itr = rb_entry(parent, struct gvt_dma, node);
174 
175 		if (gfn == itr->gfn)
176 			goto out;
177 		else if (gfn < itr->gfn)
178 			link = &parent->rb_left;
179 		else
180 			link = &parent->rb_right;
181 	}
182 
183 	rb_link_node(&new->node, parent, link);
184 	rb_insert_color(&new->node, &vgpu->vdev.cache);
185 	mutex_unlock(&vgpu->vdev.cache_lock);
186 	return;
187 
188 out:
189 	mutex_unlock(&vgpu->vdev.cache_lock);
190 	kfree(new);
191 }
192 
193 static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
194 				struct gvt_dma *entry)
195 {
196 	rb_erase(&entry->node, &vgpu->vdev.cache);
197 	kfree(entry);
198 }
199 
200 static void gvt_cache_remove(struct intel_vgpu *vgpu, gfn_t gfn)
201 {
202 	struct device *dev = mdev_dev(vgpu->vdev.mdev);
203 	struct gvt_dma *this;
204 	unsigned long g1;
205 	int rc;
206 
207 	mutex_lock(&vgpu->vdev.cache_lock);
208 	this  = __gvt_cache_find(vgpu, gfn);
209 	if (!this) {
210 		mutex_unlock(&vgpu->vdev.cache_lock);
211 		return;
212 	}
213 
214 	g1 = gfn;
215 	gvt_dma_unmap_iova(vgpu, this->iova);
216 	rc = vfio_unpin_pages(dev, &g1, 1);
217 	WARN_ON(rc != 1);
218 	__gvt_cache_remove_entry(vgpu, this);
219 	mutex_unlock(&vgpu->vdev.cache_lock);
220 }
221 
222 static void gvt_cache_init(struct intel_vgpu *vgpu)
223 {
224 	vgpu->vdev.cache = RB_ROOT;
225 	mutex_init(&vgpu->vdev.cache_lock);
226 }
227 
228 static void gvt_cache_destroy(struct intel_vgpu *vgpu)
229 {
230 	struct gvt_dma *dma;
231 	struct rb_node *node = NULL;
232 	struct device *dev = mdev_dev(vgpu->vdev.mdev);
233 	unsigned long gfn;
234 
235 	mutex_lock(&vgpu->vdev.cache_lock);
236 	while ((node = rb_first(&vgpu->vdev.cache))) {
237 		dma = rb_entry(node, struct gvt_dma, node);
238 		gvt_dma_unmap_iova(vgpu, dma->iova);
239 		gfn = dma->gfn;
240 
241 		vfio_unpin_pages(dev, &gfn, 1);
242 		__gvt_cache_remove_entry(vgpu, dma);
243 	}
244 	mutex_unlock(&vgpu->vdev.cache_lock);
245 }
246 
247 static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
248 		const char *name)
249 {
250 	int i;
251 	struct intel_vgpu_type *t;
252 	const char *driver_name = dev_driver_string(
253 			&gvt->dev_priv->drm.pdev->dev);
254 
255 	for (i = 0; i < gvt->num_types; i++) {
256 		t = &gvt->types[i];
257 		if (!strncmp(t->name, name + strlen(driver_name) + 1,
258 			sizeof(t->name)))
259 			return t;
260 	}
261 
262 	return NULL;
263 }
264 
265 static ssize_t available_instances_show(struct kobject *kobj,
266 					struct device *dev, char *buf)
267 {
268 	struct intel_vgpu_type *type;
269 	unsigned int num = 0;
270 	void *gvt = kdev_to_i915(dev)->gvt;
271 
272 	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
273 	if (!type)
274 		num = 0;
275 	else
276 		num = type->avail_instance;
277 
278 	return sprintf(buf, "%u\n", num);
279 }
280 
281 static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
282 		char *buf)
283 {
284 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
285 }
286 
287 static ssize_t description_show(struct kobject *kobj, struct device *dev,
288 		char *buf)
289 {
290 	struct intel_vgpu_type *type;
291 	void *gvt = kdev_to_i915(dev)->gvt;
292 
293 	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
294 	if (!type)
295 		return 0;
296 
297 	return sprintf(buf, "low_gm_size: %dMB\nhigh_gm_size: %dMB\n"
298 				"fence: %d\n",
299 				BYTES_TO_MB(type->low_gm_size),
300 				BYTES_TO_MB(type->high_gm_size),
301 				type->fence);
302 }
303 
304 static MDEV_TYPE_ATTR_RO(available_instances);
305 static MDEV_TYPE_ATTR_RO(device_api);
306 static MDEV_TYPE_ATTR_RO(description);
307 
308 static struct attribute *type_attrs[] = {
309 	&mdev_type_attr_available_instances.attr,
310 	&mdev_type_attr_device_api.attr,
311 	&mdev_type_attr_description.attr,
312 	NULL,
313 };
314 
315 static struct attribute_group *intel_vgpu_type_groups[] = {
316 	[0 ... NR_MAX_INTEL_VGPU_TYPES - 1] = NULL,
317 };
318 
319 static bool intel_gvt_init_vgpu_type_groups(struct intel_gvt *gvt)
320 {
321 	int i, j;
322 	struct intel_vgpu_type *type;
323 	struct attribute_group *group;
324 
325 	for (i = 0; i < gvt->num_types; i++) {
326 		type = &gvt->types[i];
327 
328 		group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
329 		if (WARN_ON(!group))
330 			goto unwind;
331 
332 		group->name = type->name;
333 		group->attrs = type_attrs;
334 		intel_vgpu_type_groups[i] = group;
335 	}
336 
337 	return true;
338 
339 unwind:
340 	for (j = 0; j < i; j++) {
341 		group = intel_vgpu_type_groups[j];
342 		kfree(group);
343 	}
344 
345 	return false;
346 }
347 
348 static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
349 {
350 	int i;
351 	struct attribute_group *group;
352 
353 	for (i = 0; i < gvt->num_types; i++) {
354 		group = intel_vgpu_type_groups[i];
355 		kfree(group);
356 	}
357 }
358 
359 static void kvmgt_protect_table_init(struct kvmgt_guest_info *info)
360 {
361 	hash_init(info->ptable);
362 }
363 
364 static void kvmgt_protect_table_destroy(struct kvmgt_guest_info *info)
365 {
366 	struct kvmgt_pgfn *p;
367 	struct hlist_node *tmp;
368 	int i;
369 
370 	hash_for_each_safe(info->ptable, i, tmp, p, hnode) {
371 		hash_del(&p->hnode);
372 		kfree(p);
373 	}
374 }
375 
376 static struct kvmgt_pgfn *
377 __kvmgt_protect_table_find(struct kvmgt_guest_info *info, gfn_t gfn)
378 {
379 	struct kvmgt_pgfn *p, *res = NULL;
380 
381 	hash_for_each_possible(info->ptable, p, hnode, gfn) {
382 		if (gfn == p->gfn) {
383 			res = p;
384 			break;
385 		}
386 	}
387 
388 	return res;
389 }
390 
391 static bool kvmgt_gfn_is_write_protected(struct kvmgt_guest_info *info,
392 				gfn_t gfn)
393 {
394 	struct kvmgt_pgfn *p;
395 
396 	p = __kvmgt_protect_table_find(info, gfn);
397 	return !!p;
398 }
399 
400 static void kvmgt_protect_table_add(struct kvmgt_guest_info *info, gfn_t gfn)
401 {
402 	struct kvmgt_pgfn *p;
403 
404 	if (kvmgt_gfn_is_write_protected(info, gfn))
405 		return;
406 
407 	p = kzalloc(sizeof(struct kvmgt_pgfn), GFP_ATOMIC);
408 	if (WARN(!p, "gfn: 0x%llx\n", gfn))
409 		return;
410 
411 	p->gfn = gfn;
412 	hash_add(info->ptable, &p->hnode, gfn);
413 }
414 
415 static void kvmgt_protect_table_del(struct kvmgt_guest_info *info,
416 				gfn_t gfn)
417 {
418 	struct kvmgt_pgfn *p;
419 
420 	p = __kvmgt_protect_table_find(info, gfn);
421 	if (p) {
422 		hash_del(&p->hnode);
423 		kfree(p);
424 	}
425 }
426 
427 static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
428 {
429 	struct intel_vgpu *vgpu;
430 	struct intel_vgpu_type *type;
431 	struct device *pdev;
432 	void *gvt;
433 	int ret;
434 
435 	pdev = mdev_parent_dev(mdev);
436 	gvt = kdev_to_i915(pdev)->gvt;
437 
438 	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
439 	if (!type) {
440 		gvt_err("failed to find type %s to create\n",
441 						kobject_name(kobj));
442 		ret = -EINVAL;
443 		goto out;
444 	}
445 
446 	vgpu = intel_gvt_ops->vgpu_create(gvt, type);
447 	if (IS_ERR_OR_NULL(vgpu)) {
448 		ret = vgpu == NULL ? -EFAULT : PTR_ERR(vgpu);
449 		gvt_err("failed to create intel vgpu: %d\n", ret);
450 		goto out;
451 	}
452 
453 	INIT_WORK(&vgpu->vdev.release_work, intel_vgpu_release_work);
454 
455 	vgpu->vdev.mdev = mdev;
456 	mdev_set_drvdata(mdev, vgpu);
457 
458 	gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
459 		     dev_name(mdev_dev(mdev)));
460 	ret = 0;
461 
462 out:
463 	return ret;
464 }
465 
466 static int intel_vgpu_remove(struct mdev_device *mdev)
467 {
468 	struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
469 
470 	if (handle_valid(vgpu->handle))
471 		return -EBUSY;
472 
473 	intel_gvt_ops->vgpu_destroy(vgpu);
474 	return 0;
475 }
476 
477 static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
478 				     unsigned long action, void *data)
479 {
480 	struct intel_vgpu *vgpu = container_of(nb,
481 					struct intel_vgpu,
482 					vdev.iommu_notifier);
483 
484 	if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
485 		struct vfio_iommu_type1_dma_unmap *unmap = data;
486 		unsigned long gfn, end_gfn;
487 
488 		gfn = unmap->iova >> PAGE_SHIFT;
489 		end_gfn = gfn + unmap->size / PAGE_SIZE;
490 
491 		while (gfn < end_gfn)
492 			gvt_cache_remove(vgpu, gfn++);
493 	}
494 
495 	return NOTIFY_OK;
496 }
497 
498 static int intel_vgpu_group_notifier(struct notifier_block *nb,
499 				     unsigned long action, void *data)
500 {
501 	struct intel_vgpu *vgpu = container_of(nb,
502 					struct intel_vgpu,
503 					vdev.group_notifier);
504 
505 	/* the only action we care about */
506 	if (action == VFIO_GROUP_NOTIFY_SET_KVM) {
507 		vgpu->vdev.kvm = data;
508 
509 		if (!data)
510 			schedule_work(&vgpu->vdev.release_work);
511 	}
512 
513 	return NOTIFY_OK;
514 }
515 
516 static int intel_vgpu_open(struct mdev_device *mdev)
517 {
518 	struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
519 	unsigned long events;
520 	int ret;
521 
522 	vgpu->vdev.iommu_notifier.notifier_call = intel_vgpu_iommu_notifier;
523 	vgpu->vdev.group_notifier.notifier_call = intel_vgpu_group_notifier;
524 
525 	events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
526 	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, &events,
527 				&vgpu->vdev.iommu_notifier);
528 	if (ret != 0) {
529 		gvt_err("vfio_register_notifier for iommu failed: %d\n", ret);
530 		goto out;
531 	}
532 
533 	events = VFIO_GROUP_NOTIFY_SET_KVM;
534 	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &events,
535 				&vgpu->vdev.group_notifier);
536 	if (ret != 0) {
537 		gvt_err("vfio_register_notifier for group failed: %d\n", ret);
538 		goto undo_iommu;
539 	}
540 
541 	ret = kvmgt_guest_init(mdev);
542 	if (ret)
543 		goto undo_group;
544 
545 	atomic_set(&vgpu->vdev.released, 0);
546 	return ret;
547 
548 undo_group:
549 	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
550 					&vgpu->vdev.group_notifier);
551 
552 undo_iommu:
553 	vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
554 					&vgpu->vdev.iommu_notifier);
555 out:
556 	return ret;
557 }
558 
559 static void __intel_vgpu_release(struct intel_vgpu *vgpu)
560 {
561 	struct kvmgt_guest_info *info;
562 	int ret;
563 
564 	if (!handle_valid(vgpu->handle))
565 		return;
566 
567 	if (atomic_cmpxchg(&vgpu->vdev.released, 0, 1))
568 		return;
569 
570 	ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_IOMMU_NOTIFY,
571 					&vgpu->vdev.iommu_notifier);
572 	WARN(ret, "vfio_unregister_notifier for iommu failed: %d\n", ret);
573 
574 	ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_GROUP_NOTIFY,
575 					&vgpu->vdev.group_notifier);
576 	WARN(ret, "vfio_unregister_notifier for group failed: %d\n", ret);
577 
578 	info = (struct kvmgt_guest_info *)vgpu->handle;
579 	kvmgt_guest_exit(info);
580 
581 	vgpu->vdev.kvm = NULL;
582 	vgpu->handle = 0;
583 }
584 
585 static void intel_vgpu_release(struct mdev_device *mdev)
586 {
587 	struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
588 
589 	__intel_vgpu_release(vgpu);
590 }
591 
592 static void intel_vgpu_release_work(struct work_struct *work)
593 {
594 	struct intel_vgpu *vgpu = container_of(work, struct intel_vgpu,
595 					vdev.release_work);
596 
597 	__intel_vgpu_release(vgpu);
598 }
599 
600 static uint64_t intel_vgpu_get_bar0_addr(struct intel_vgpu *vgpu)
601 {
602 	u32 start_lo, start_hi;
603 	u32 mem_type;
604 	int pos = PCI_BASE_ADDRESS_0;
605 
606 	start_lo = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + pos)) &
607 			PCI_BASE_ADDRESS_MEM_MASK;
608 	mem_type = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + pos)) &
609 			PCI_BASE_ADDRESS_MEM_TYPE_MASK;
610 
611 	switch (mem_type) {
612 	case PCI_BASE_ADDRESS_MEM_TYPE_64:
613 		start_hi = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space
614 						+ pos + 4));
615 		break;
616 	case PCI_BASE_ADDRESS_MEM_TYPE_32:
617 	case PCI_BASE_ADDRESS_MEM_TYPE_1M:
618 		/* 1M mem BAR treated as 32-bit BAR */
619 	default:
620 		/* mem unknown type treated as 32-bit BAR */
621 		start_hi = 0;
622 		break;
623 	}
624 
625 	return ((u64)start_hi << 32) | start_lo;
626 }
627 
628 static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
629 			size_t count, loff_t *ppos, bool is_write)
630 {
631 	struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
632 	unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
633 	uint64_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
634 	int ret = -EINVAL;
635 
636 
637 	if (index >= VFIO_PCI_NUM_REGIONS) {
638 		gvt_err("invalid index: %u\n", index);
639 		return -EINVAL;
640 	}
641 
642 	switch (index) {
643 	case VFIO_PCI_CONFIG_REGION_INDEX:
644 		if (is_write)
645 			ret = intel_gvt_ops->emulate_cfg_write(vgpu, pos,
646 						buf, count);
647 		else
648 			ret = intel_gvt_ops->emulate_cfg_read(vgpu, pos,
649 						buf, count);
650 		break;
651 	case VFIO_PCI_BAR0_REGION_INDEX:
652 	case VFIO_PCI_BAR1_REGION_INDEX:
653 		if (is_write) {
654 			uint64_t bar0_start = intel_vgpu_get_bar0_addr(vgpu);
655 
656 			ret = intel_gvt_ops->emulate_mmio_write(vgpu,
657 						bar0_start + pos, buf, count);
658 		} else {
659 			uint64_t bar0_start = intel_vgpu_get_bar0_addr(vgpu);
660 
661 			ret = intel_gvt_ops->emulate_mmio_read(vgpu,
662 						bar0_start + pos, buf, count);
663 		}
664 		break;
665 	case VFIO_PCI_BAR2_REGION_INDEX:
666 	case VFIO_PCI_BAR3_REGION_INDEX:
667 	case VFIO_PCI_BAR4_REGION_INDEX:
668 	case VFIO_PCI_BAR5_REGION_INDEX:
669 	case VFIO_PCI_VGA_REGION_INDEX:
670 	case VFIO_PCI_ROM_REGION_INDEX:
671 	default:
672 		gvt_err("unsupported region: %u\n", index);
673 	}
674 
675 	return ret == 0 ? count : ret;
676 }
677 
678 static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
679 			size_t count, loff_t *ppos)
680 {
681 	unsigned int done = 0;
682 	int ret;
683 
684 	while (count) {
685 		size_t filled;
686 
687 		if (count >= 4 && !(*ppos % 4)) {
688 			u32 val;
689 
690 			ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
691 					ppos, false);
692 			if (ret <= 0)
693 				goto read_err;
694 
695 			if (copy_to_user(buf, &val, sizeof(val)))
696 				goto read_err;
697 
698 			filled = 4;
699 		} else if (count >= 2 && !(*ppos % 2)) {
700 			u16 val;
701 
702 			ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
703 					ppos, false);
704 			if (ret <= 0)
705 				goto read_err;
706 
707 			if (copy_to_user(buf, &val, sizeof(val)))
708 				goto read_err;
709 
710 			filled = 2;
711 		} else {
712 			u8 val;
713 
714 			ret = intel_vgpu_rw(mdev, &val, sizeof(val), ppos,
715 					false);
716 			if (ret <= 0)
717 				goto read_err;
718 
719 			if (copy_to_user(buf, &val, sizeof(val)))
720 				goto read_err;
721 
722 			filled = 1;
723 		}
724 
725 		count -= filled;
726 		done += filled;
727 		*ppos += filled;
728 		buf += filled;
729 	}
730 
731 	return done;
732 
733 read_err:
734 	return -EFAULT;
735 }
736 
737 static ssize_t intel_vgpu_write(struct mdev_device *mdev,
738 				const char __user *buf,
739 				size_t count, loff_t *ppos)
740 {
741 	unsigned int done = 0;
742 	int ret;
743 
744 	while (count) {
745 		size_t filled;
746 
747 		if (count >= 4 && !(*ppos % 4)) {
748 			u32 val;
749 
750 			if (copy_from_user(&val, buf, sizeof(val)))
751 				goto write_err;
752 
753 			ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
754 					ppos, true);
755 			if (ret <= 0)
756 				goto write_err;
757 
758 			filled = 4;
759 		} else if (count >= 2 && !(*ppos % 2)) {
760 			u16 val;
761 
762 			if (copy_from_user(&val, buf, sizeof(val)))
763 				goto write_err;
764 
765 			ret = intel_vgpu_rw(mdev, (char *)&val,
766 					sizeof(val), ppos, true);
767 			if (ret <= 0)
768 				goto write_err;
769 
770 			filled = 2;
771 		} else {
772 			u8 val;
773 
774 			if (copy_from_user(&val, buf, sizeof(val)))
775 				goto write_err;
776 
777 			ret = intel_vgpu_rw(mdev, &val, sizeof(val),
778 					ppos, true);
779 			if (ret <= 0)
780 				goto write_err;
781 
782 			filled = 1;
783 		}
784 
785 		count -= filled;
786 		done += filled;
787 		*ppos += filled;
788 		buf += filled;
789 	}
790 
791 	return done;
792 write_err:
793 	return -EFAULT;
794 }
795 
796 static int intel_vgpu_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
797 {
798 	unsigned int index;
799 	u64 virtaddr;
800 	unsigned long req_size, pgoff = 0;
801 	pgprot_t pg_prot;
802 	struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
803 
804 	index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
805 	if (index >= VFIO_PCI_ROM_REGION_INDEX)
806 		return -EINVAL;
807 
808 	if (vma->vm_end < vma->vm_start)
809 		return -EINVAL;
810 	if ((vma->vm_flags & VM_SHARED) == 0)
811 		return -EINVAL;
812 	if (index != VFIO_PCI_BAR2_REGION_INDEX)
813 		return -EINVAL;
814 
815 	pg_prot = vma->vm_page_prot;
816 	virtaddr = vma->vm_start;
817 	req_size = vma->vm_end - vma->vm_start;
818 	pgoff = vgpu_aperture_pa_base(vgpu) >> PAGE_SHIFT;
819 
820 	return remap_pfn_range(vma, virtaddr, pgoff, req_size, pg_prot);
821 }
822 
823 static int intel_vgpu_get_irq_count(struct intel_vgpu *vgpu, int type)
824 {
825 	if (type == VFIO_PCI_INTX_IRQ_INDEX || type == VFIO_PCI_MSI_IRQ_INDEX)
826 		return 1;
827 
828 	return 0;
829 }
830 
831 static int intel_vgpu_set_intx_mask(struct intel_vgpu *vgpu,
832 			unsigned int index, unsigned int start,
833 			unsigned int count, uint32_t flags,
834 			void *data)
835 {
836 	return 0;
837 }
838 
839 static int intel_vgpu_set_intx_unmask(struct intel_vgpu *vgpu,
840 			unsigned int index, unsigned int start,
841 			unsigned int count, uint32_t flags, void *data)
842 {
843 	return 0;
844 }
845 
846 static int intel_vgpu_set_intx_trigger(struct intel_vgpu *vgpu,
847 		unsigned int index, unsigned int start, unsigned int count,
848 		uint32_t flags, void *data)
849 {
850 	return 0;
851 }
852 
853 static int intel_vgpu_set_msi_trigger(struct intel_vgpu *vgpu,
854 		unsigned int index, unsigned int start, unsigned int count,
855 		uint32_t flags, void *data)
856 {
857 	struct eventfd_ctx *trigger;
858 
859 	if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
860 		int fd = *(int *)data;
861 
862 		trigger = eventfd_ctx_fdget(fd);
863 		if (IS_ERR(trigger)) {
864 			gvt_err("eventfd_ctx_fdget failed\n");
865 			return PTR_ERR(trigger);
866 		}
867 		vgpu->vdev.msi_trigger = trigger;
868 	}
869 
870 	return 0;
871 }
872 
873 static int intel_vgpu_set_irqs(struct intel_vgpu *vgpu, uint32_t flags,
874 		unsigned int index, unsigned int start, unsigned int count,
875 		void *data)
876 {
877 	int (*func)(struct intel_vgpu *vgpu, unsigned int index,
878 			unsigned int start, unsigned int count, uint32_t flags,
879 			void *data) = NULL;
880 
881 	switch (index) {
882 	case VFIO_PCI_INTX_IRQ_INDEX:
883 		switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
884 		case VFIO_IRQ_SET_ACTION_MASK:
885 			func = intel_vgpu_set_intx_mask;
886 			break;
887 		case VFIO_IRQ_SET_ACTION_UNMASK:
888 			func = intel_vgpu_set_intx_unmask;
889 			break;
890 		case VFIO_IRQ_SET_ACTION_TRIGGER:
891 			func = intel_vgpu_set_intx_trigger;
892 			break;
893 		}
894 		break;
895 	case VFIO_PCI_MSI_IRQ_INDEX:
896 		switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
897 		case VFIO_IRQ_SET_ACTION_MASK:
898 		case VFIO_IRQ_SET_ACTION_UNMASK:
899 			/* XXX Need masking support exported */
900 			break;
901 		case VFIO_IRQ_SET_ACTION_TRIGGER:
902 			func = intel_vgpu_set_msi_trigger;
903 			break;
904 		}
905 		break;
906 	}
907 
908 	if (!func)
909 		return -ENOTTY;
910 
911 	return func(vgpu, index, start, count, flags, data);
912 }
913 
914 static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
915 			     unsigned long arg)
916 {
917 	struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
918 	unsigned long minsz;
919 
920 	gvt_dbg_core("vgpu%d ioctl, cmd: %d\n", vgpu->id, cmd);
921 
922 	if (cmd == VFIO_DEVICE_GET_INFO) {
923 		struct vfio_device_info info;
924 
925 		minsz = offsetofend(struct vfio_device_info, num_irqs);
926 
927 		if (copy_from_user(&info, (void __user *)arg, minsz))
928 			return -EFAULT;
929 
930 		if (info.argsz < minsz)
931 			return -EINVAL;
932 
933 		info.flags = VFIO_DEVICE_FLAGS_PCI;
934 		info.flags |= VFIO_DEVICE_FLAGS_RESET;
935 		info.num_regions = VFIO_PCI_NUM_REGIONS;
936 		info.num_irqs = VFIO_PCI_NUM_IRQS;
937 
938 		return copy_to_user((void __user *)arg, &info, minsz) ?
939 			-EFAULT : 0;
940 
941 	} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
942 		struct vfio_region_info info;
943 		struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
944 		int i, ret;
945 		struct vfio_region_info_cap_sparse_mmap *sparse = NULL;
946 		size_t size;
947 		int nr_areas = 1;
948 		int cap_type_id;
949 
950 		minsz = offsetofend(struct vfio_region_info, offset);
951 
952 		if (copy_from_user(&info, (void __user *)arg, minsz))
953 			return -EFAULT;
954 
955 		if (info.argsz < minsz)
956 			return -EINVAL;
957 
958 		switch (info.index) {
959 		case VFIO_PCI_CONFIG_REGION_INDEX:
960 			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
961 			info.size = INTEL_GVT_MAX_CFG_SPACE_SZ;
962 			info.flags = VFIO_REGION_INFO_FLAG_READ |
963 				     VFIO_REGION_INFO_FLAG_WRITE;
964 			break;
965 		case VFIO_PCI_BAR0_REGION_INDEX:
966 			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
967 			info.size = vgpu->cfg_space.bar[info.index].size;
968 			if (!info.size) {
969 				info.flags = 0;
970 				break;
971 			}
972 
973 			info.flags = VFIO_REGION_INFO_FLAG_READ |
974 				     VFIO_REGION_INFO_FLAG_WRITE;
975 			break;
976 		case VFIO_PCI_BAR1_REGION_INDEX:
977 			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
978 			info.size = 0;
979 			info.flags = 0;
980 			break;
981 		case VFIO_PCI_BAR2_REGION_INDEX:
982 			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
983 			info.flags = VFIO_REGION_INFO_FLAG_CAPS |
984 					VFIO_REGION_INFO_FLAG_MMAP |
985 					VFIO_REGION_INFO_FLAG_READ |
986 					VFIO_REGION_INFO_FLAG_WRITE;
987 			info.size = gvt_aperture_sz(vgpu->gvt);
988 
989 			size = sizeof(*sparse) +
990 					(nr_areas * sizeof(*sparse->areas));
991 			sparse = kzalloc(size, GFP_KERNEL);
992 			if (!sparse)
993 				return -ENOMEM;
994 
995 			sparse->nr_areas = nr_areas;
996 			cap_type_id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
997 			sparse->areas[0].offset =
998 					PAGE_ALIGN(vgpu_aperture_offset(vgpu));
999 			sparse->areas[0].size = vgpu_aperture_sz(vgpu);
1000 			break;
1001 
1002 		case VFIO_PCI_BAR3_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
1003 			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1004 			info.size = 0;
1005 
1006 			info.flags = 0;
1007 			gvt_dbg_core("get region info bar:%d\n", info.index);
1008 			break;
1009 
1010 		case VFIO_PCI_ROM_REGION_INDEX:
1011 		case VFIO_PCI_VGA_REGION_INDEX:
1012 			gvt_dbg_core("get region info index:%d\n", info.index);
1013 			break;
1014 		default:
1015 			{
1016 				struct vfio_region_info_cap_type cap_type;
1017 
1018 				if (info.index >= VFIO_PCI_NUM_REGIONS +
1019 						vgpu->vdev.num_regions)
1020 					return -EINVAL;
1021 
1022 				i = info.index - VFIO_PCI_NUM_REGIONS;
1023 
1024 				info.offset =
1025 					VFIO_PCI_INDEX_TO_OFFSET(info.index);
1026 				info.size = vgpu->vdev.region[i].size;
1027 				info.flags = vgpu->vdev.region[i].flags;
1028 
1029 				cap_type.type = vgpu->vdev.region[i].type;
1030 				cap_type.subtype = vgpu->vdev.region[i].subtype;
1031 
1032 				ret = vfio_info_add_capability(&caps,
1033 						VFIO_REGION_INFO_CAP_TYPE,
1034 						&cap_type);
1035 				if (ret)
1036 					return ret;
1037 			}
1038 		}
1039 
1040 		if ((info.flags & VFIO_REGION_INFO_FLAG_CAPS) && sparse) {
1041 			switch (cap_type_id) {
1042 			case VFIO_REGION_INFO_CAP_SPARSE_MMAP:
1043 				ret = vfio_info_add_capability(&caps,
1044 					VFIO_REGION_INFO_CAP_SPARSE_MMAP,
1045 					sparse);
1046 				kfree(sparse);
1047 				if (ret)
1048 					return ret;
1049 				break;
1050 			default:
1051 				return -EINVAL;
1052 			}
1053 		}
1054 
1055 		if (caps.size) {
1056 			if (info.argsz < sizeof(info) + caps.size) {
1057 				info.argsz = sizeof(info) + caps.size;
1058 				info.cap_offset = 0;
1059 			} else {
1060 				vfio_info_cap_shift(&caps, sizeof(info));
1061 				if (copy_to_user((void __user *)arg +
1062 						  sizeof(info), caps.buf,
1063 						  caps.size)) {
1064 					kfree(caps.buf);
1065 					return -EFAULT;
1066 				}
1067 				info.cap_offset = sizeof(info);
1068 			}
1069 
1070 			kfree(caps.buf);
1071 		}
1072 
1073 		return copy_to_user((void __user *)arg, &info, minsz) ?
1074 			-EFAULT : 0;
1075 	} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
1076 		struct vfio_irq_info info;
1077 
1078 		minsz = offsetofend(struct vfio_irq_info, count);
1079 
1080 		if (copy_from_user(&info, (void __user *)arg, minsz))
1081 			return -EFAULT;
1082 
1083 		if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
1084 			return -EINVAL;
1085 
1086 		switch (info.index) {
1087 		case VFIO_PCI_INTX_IRQ_INDEX:
1088 		case VFIO_PCI_MSI_IRQ_INDEX:
1089 			break;
1090 		default:
1091 			return -EINVAL;
1092 		}
1093 
1094 		info.flags = VFIO_IRQ_INFO_EVENTFD;
1095 
1096 		info.count = intel_vgpu_get_irq_count(vgpu, info.index);
1097 
1098 		if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
1099 			info.flags |= (VFIO_IRQ_INFO_MASKABLE |
1100 				       VFIO_IRQ_INFO_AUTOMASKED);
1101 		else
1102 			info.flags |= VFIO_IRQ_INFO_NORESIZE;
1103 
1104 		return copy_to_user((void __user *)arg, &info, minsz) ?
1105 			-EFAULT : 0;
1106 	} else if (cmd == VFIO_DEVICE_SET_IRQS) {
1107 		struct vfio_irq_set hdr;
1108 		u8 *data = NULL;
1109 		int ret = 0;
1110 		size_t data_size = 0;
1111 
1112 		minsz = offsetofend(struct vfio_irq_set, count);
1113 
1114 		if (copy_from_user(&hdr, (void __user *)arg, minsz))
1115 			return -EFAULT;
1116 
1117 		if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
1118 			int max = intel_vgpu_get_irq_count(vgpu, hdr.index);
1119 
1120 			ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
1121 						VFIO_PCI_NUM_IRQS, &data_size);
1122 			if (ret) {
1123 				gvt_err("intel:vfio_set_irqs_validate_and_prepare failed\n");
1124 				return -EINVAL;
1125 			}
1126 			if (data_size) {
1127 				data = memdup_user((void __user *)(arg + minsz),
1128 						   data_size);
1129 				if (IS_ERR(data))
1130 					return PTR_ERR(data);
1131 			}
1132 		}
1133 
1134 		ret = intel_vgpu_set_irqs(vgpu, hdr.flags, hdr.index,
1135 					hdr.start, hdr.count, data);
1136 		kfree(data);
1137 
1138 		return ret;
1139 	} else if (cmd == VFIO_DEVICE_RESET) {
1140 		intel_gvt_ops->vgpu_reset(vgpu);
1141 		return 0;
1142 	}
1143 
1144 	return 0;
1145 }
1146 
1147 static const struct mdev_parent_ops intel_vgpu_ops = {
1148 	.supported_type_groups	= intel_vgpu_type_groups,
1149 	.create			= intel_vgpu_create,
1150 	.remove			= intel_vgpu_remove,
1151 
1152 	.open			= intel_vgpu_open,
1153 	.release		= intel_vgpu_release,
1154 
1155 	.read			= intel_vgpu_read,
1156 	.write			= intel_vgpu_write,
1157 	.mmap			= intel_vgpu_mmap,
1158 	.ioctl			= intel_vgpu_ioctl,
1159 };
1160 
1161 static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
1162 {
1163 	if (!intel_gvt_init_vgpu_type_groups(gvt))
1164 		return -EFAULT;
1165 
1166 	intel_gvt_ops = ops;
1167 
1168 	return mdev_register_device(dev, &intel_vgpu_ops);
1169 }
1170 
1171 static void kvmgt_host_exit(struct device *dev, void *gvt)
1172 {
1173 	intel_gvt_cleanup_vgpu_type_groups(gvt);
1174 	mdev_unregister_device(dev);
1175 }
1176 
1177 static int kvmgt_write_protect_add(unsigned long handle, u64 gfn)
1178 {
1179 	struct kvmgt_guest_info *info;
1180 	struct kvm *kvm;
1181 	struct kvm_memory_slot *slot;
1182 	int idx;
1183 
1184 	if (!handle_valid(handle))
1185 		return -ESRCH;
1186 
1187 	info = (struct kvmgt_guest_info *)handle;
1188 	kvm = info->kvm;
1189 
1190 	idx = srcu_read_lock(&kvm->srcu);
1191 	slot = gfn_to_memslot(kvm, gfn);
1192 	if (!slot) {
1193 		srcu_read_unlock(&kvm->srcu, idx);
1194 		return -EINVAL;
1195 	}
1196 
1197 	spin_lock(&kvm->mmu_lock);
1198 
1199 	if (kvmgt_gfn_is_write_protected(info, gfn))
1200 		goto out;
1201 
1202 	kvm_slot_page_track_add_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
1203 	kvmgt_protect_table_add(info, gfn);
1204 
1205 out:
1206 	spin_unlock(&kvm->mmu_lock);
1207 	srcu_read_unlock(&kvm->srcu, idx);
1208 	return 0;
1209 }
1210 
1211 static int kvmgt_write_protect_remove(unsigned long handle, u64 gfn)
1212 {
1213 	struct kvmgt_guest_info *info;
1214 	struct kvm *kvm;
1215 	struct kvm_memory_slot *slot;
1216 	int idx;
1217 
1218 	if (!handle_valid(handle))
1219 		return 0;
1220 
1221 	info = (struct kvmgt_guest_info *)handle;
1222 	kvm = info->kvm;
1223 
1224 	idx = srcu_read_lock(&kvm->srcu);
1225 	slot = gfn_to_memslot(kvm, gfn);
1226 	if (!slot) {
1227 		srcu_read_unlock(&kvm->srcu, idx);
1228 		return -EINVAL;
1229 	}
1230 
1231 	spin_lock(&kvm->mmu_lock);
1232 
1233 	if (!kvmgt_gfn_is_write_protected(info, gfn))
1234 		goto out;
1235 
1236 	kvm_slot_page_track_remove_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
1237 	kvmgt_protect_table_del(info, gfn);
1238 
1239 out:
1240 	spin_unlock(&kvm->mmu_lock);
1241 	srcu_read_unlock(&kvm->srcu, idx);
1242 	return 0;
1243 }
1244 
1245 static void kvmgt_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa,
1246 		const u8 *val, int len,
1247 		struct kvm_page_track_notifier_node *node)
1248 {
1249 	struct kvmgt_guest_info *info = container_of(node,
1250 					struct kvmgt_guest_info, track_node);
1251 
1252 	if (kvmgt_gfn_is_write_protected(info, gpa_to_gfn(gpa)))
1253 		intel_gvt_ops->emulate_mmio_write(info->vgpu, gpa,
1254 					(void *)val, len);
1255 }
1256 
1257 static void kvmgt_page_track_flush_slot(struct kvm *kvm,
1258 		struct kvm_memory_slot *slot,
1259 		struct kvm_page_track_notifier_node *node)
1260 {
1261 	int i;
1262 	gfn_t gfn;
1263 	struct kvmgt_guest_info *info = container_of(node,
1264 					struct kvmgt_guest_info, track_node);
1265 
1266 	spin_lock(&kvm->mmu_lock);
1267 	for (i = 0; i < slot->npages; i++) {
1268 		gfn = slot->base_gfn + i;
1269 		if (kvmgt_gfn_is_write_protected(info, gfn)) {
1270 			kvm_slot_page_track_remove_page(kvm, slot, gfn,
1271 						KVM_PAGE_TRACK_WRITE);
1272 			kvmgt_protect_table_del(info, gfn);
1273 		}
1274 	}
1275 	spin_unlock(&kvm->mmu_lock);
1276 }
1277 
1278 static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
1279 {
1280 	struct intel_vgpu *itr;
1281 	struct kvmgt_guest_info *info;
1282 	int id;
1283 	bool ret = false;
1284 
1285 	mutex_lock(&vgpu->gvt->lock);
1286 	for_each_active_vgpu(vgpu->gvt, itr, id) {
1287 		if (!handle_valid(itr->handle))
1288 			continue;
1289 
1290 		info = (struct kvmgt_guest_info *)itr->handle;
1291 		if (kvm && kvm == info->kvm) {
1292 			ret = true;
1293 			goto out;
1294 		}
1295 	}
1296 out:
1297 	mutex_unlock(&vgpu->gvt->lock);
1298 	return ret;
1299 }
1300 
1301 static int kvmgt_guest_init(struct mdev_device *mdev)
1302 {
1303 	struct kvmgt_guest_info *info;
1304 	struct intel_vgpu *vgpu;
1305 	struct kvm *kvm;
1306 
1307 	vgpu = mdev_get_drvdata(mdev);
1308 	if (handle_valid(vgpu->handle))
1309 		return -EEXIST;
1310 
1311 	kvm = vgpu->vdev.kvm;
1312 	if (!kvm || kvm->mm != current->mm) {
1313 		gvt_err("KVM is required to use Intel vGPU\n");
1314 		return -ESRCH;
1315 	}
1316 
1317 	if (__kvmgt_vgpu_exist(vgpu, kvm))
1318 		return -EEXIST;
1319 
1320 	info = vzalloc(sizeof(struct kvmgt_guest_info));
1321 	if (!info)
1322 		return -ENOMEM;
1323 
1324 	vgpu->handle = (unsigned long)info;
1325 	info->vgpu = vgpu;
1326 	info->kvm = kvm;
1327 
1328 	kvmgt_protect_table_init(info);
1329 	gvt_cache_init(vgpu);
1330 
1331 	info->track_node.track_write = kvmgt_page_track_write;
1332 	info->track_node.track_flush_slot = kvmgt_page_track_flush_slot;
1333 	kvm_page_track_register_notifier(kvm, &info->track_node);
1334 
1335 	return 0;
1336 }
1337 
1338 static bool kvmgt_guest_exit(struct kvmgt_guest_info *info)
1339 {
1340 	if (!info) {
1341 		gvt_err("kvmgt_guest_info invalid\n");
1342 		return false;
1343 	}
1344 
1345 	kvm_page_track_unregister_notifier(info->kvm, &info->track_node);
1346 	kvmgt_protect_table_destroy(info);
1347 	gvt_cache_destroy(info->vgpu);
1348 	vfree(info);
1349 
1350 	return true;
1351 }
1352 
1353 static int kvmgt_attach_vgpu(void *vgpu, unsigned long *handle)
1354 {
1355 	/* nothing to do here */
1356 	return 0;
1357 }
1358 
1359 static void kvmgt_detach_vgpu(unsigned long handle)
1360 {
1361 	/* nothing to do here */
1362 }
1363 
1364 static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data)
1365 {
1366 	struct kvmgt_guest_info *info;
1367 	struct intel_vgpu *vgpu;
1368 
1369 	if (!handle_valid(handle))
1370 		return -ESRCH;
1371 
1372 	info = (struct kvmgt_guest_info *)handle;
1373 	vgpu = info->vgpu;
1374 
1375 	if (eventfd_signal(vgpu->vdev.msi_trigger, 1) == 1)
1376 		return 0;
1377 
1378 	return -EFAULT;
1379 }
1380 
1381 static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
1382 {
1383 	unsigned long iova, pfn;
1384 	struct kvmgt_guest_info *info;
1385 	struct device *dev;
1386 	int rc;
1387 
1388 	if (!handle_valid(handle))
1389 		return INTEL_GVT_INVALID_ADDR;
1390 
1391 	info = (struct kvmgt_guest_info *)handle;
1392 	iova = gvt_cache_find(info->vgpu, gfn);
1393 	if (iova != INTEL_GVT_INVALID_ADDR)
1394 		return iova;
1395 
1396 	pfn = INTEL_GVT_INVALID_ADDR;
1397 	dev = mdev_dev(info->vgpu->vdev.mdev);
1398 	rc = vfio_pin_pages(dev, &gfn, 1, IOMMU_READ | IOMMU_WRITE, &pfn);
1399 	if (rc != 1) {
1400 		gvt_err("vfio_pin_pages failed for gfn 0x%lx: %d\n", gfn, rc);
1401 		return INTEL_GVT_INVALID_ADDR;
1402 	}
1403 	/* transfer to host iova for GFX to use DMA */
1404 	rc = gvt_dma_map_iova(info->vgpu, pfn, &iova);
1405 	if (rc) {
1406 		gvt_err("gvt_dma_map_iova failed for gfn: 0x%lx\n", gfn);
1407 		vfio_unpin_pages(dev, &gfn, 1);
1408 		return INTEL_GVT_INVALID_ADDR;
1409 	}
1410 
1411 	gvt_cache_add(info->vgpu, gfn, iova);
1412 	return iova;
1413 }
1414 
1415 static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa,
1416 			void *buf, unsigned long len, bool write)
1417 {
1418 	struct kvmgt_guest_info *info;
1419 	struct kvm *kvm;
1420 	int ret;
1421 	bool kthread = current->mm == NULL;
1422 
1423 	if (!handle_valid(handle))
1424 		return -ESRCH;
1425 
1426 	info = (struct kvmgt_guest_info *)handle;
1427 	kvm = info->kvm;
1428 
1429 	if (kthread)
1430 		use_mm(kvm->mm);
1431 
1432 	ret = write ? kvm_write_guest(kvm, gpa, buf, len) :
1433 		      kvm_read_guest(kvm, gpa, buf, len);
1434 
1435 	if (kthread)
1436 		unuse_mm(kvm->mm);
1437 
1438 	return ret;
1439 }
1440 
1441 static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa,
1442 			void *buf, unsigned long len)
1443 {
1444 	return kvmgt_rw_gpa(handle, gpa, buf, len, false);
1445 }
1446 
1447 static int kvmgt_write_gpa(unsigned long handle, unsigned long gpa,
1448 			void *buf, unsigned long len)
1449 {
1450 	return kvmgt_rw_gpa(handle, gpa, buf, len, true);
1451 }
1452 
1453 static unsigned long kvmgt_virt_to_pfn(void *addr)
1454 {
1455 	return PFN_DOWN(__pa(addr));
1456 }
1457 
1458 struct intel_gvt_mpt kvmgt_mpt = {
1459 	.host_init = kvmgt_host_init,
1460 	.host_exit = kvmgt_host_exit,
1461 	.attach_vgpu = kvmgt_attach_vgpu,
1462 	.detach_vgpu = kvmgt_detach_vgpu,
1463 	.inject_msi = kvmgt_inject_msi,
1464 	.from_virt_to_mfn = kvmgt_virt_to_pfn,
1465 	.set_wp_page = kvmgt_write_protect_add,
1466 	.unset_wp_page = kvmgt_write_protect_remove,
1467 	.read_gpa = kvmgt_read_gpa,
1468 	.write_gpa = kvmgt_write_gpa,
1469 	.gfn_to_mfn = kvmgt_gfn_to_pfn,
1470 };
1471 EXPORT_SYMBOL_GPL(kvmgt_mpt);
1472 
1473 static int __init kvmgt_init(void)
1474 {
1475 	return 0;
1476 }
1477 
1478 static void __exit kvmgt_exit(void)
1479 {
1480 }
1481 
1482 module_init(kvmgt_init);
1483 module_exit(kvmgt_exit);
1484 
1485 MODULE_LICENSE("GPL and additional rights");
1486 MODULE_AUTHOR("Intel Corporation");
1487