]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/gpu/drm/i915/gvt/kvmgt.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge remote-tracking branches 'asoc/topic/adsp', 'asoc/topic/ak4613', 'asoc/topic...
[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / i915 / gvt / kvmgt.c
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 if (unlikely(!pfn_valid(pfn)))
100 return -EFAULT;
101
102 page = pfn_to_page(pfn);
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\nresolution: %s\n",
299 BYTES_TO_MB(type->low_gm_size),
300 BYTES_TO_MB(type->high_gm_size),
301 type->fence, vgpu_edid_str(type->resolution));
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 = NULL;
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_vgpu_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_vgpu_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_vgpu_err("vfio_register_notifier for iommu failed: %d\n",
530 ret);
531 goto out;
532 }
533
534 events = VFIO_GROUP_NOTIFY_SET_KVM;
535 ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &events,
536 &vgpu->vdev.group_notifier);
537 if (ret != 0) {
538 gvt_vgpu_err("vfio_register_notifier for group failed: %d\n",
539 ret);
540 goto undo_iommu;
541 }
542
543 ret = kvmgt_guest_init(mdev);
544 if (ret)
545 goto undo_group;
546
547 intel_gvt_ops->vgpu_activate(vgpu);
548
549 atomic_set(&vgpu->vdev.released, 0);
550 return ret;
551
552 undo_group:
553 vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
554 &vgpu->vdev.group_notifier);
555
556 undo_iommu:
557 vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
558 &vgpu->vdev.iommu_notifier);
559 out:
560 return ret;
561 }
562
563 static void __intel_vgpu_release(struct intel_vgpu *vgpu)
564 {
565 struct kvmgt_guest_info *info;
566 int ret;
567
568 if (!handle_valid(vgpu->handle))
569 return;
570
571 if (atomic_cmpxchg(&vgpu->vdev.released, 0, 1))
572 return;
573
574 intel_gvt_ops->vgpu_deactivate(vgpu);
575
576 ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_IOMMU_NOTIFY,
577 &vgpu->vdev.iommu_notifier);
578 WARN(ret, "vfio_unregister_notifier for iommu failed: %d\n", ret);
579
580 ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_GROUP_NOTIFY,
581 &vgpu->vdev.group_notifier);
582 WARN(ret, "vfio_unregister_notifier for group failed: %d\n", ret);
583
584 info = (struct kvmgt_guest_info *)vgpu->handle;
585 kvmgt_guest_exit(info);
586
587 vgpu->vdev.kvm = NULL;
588 vgpu->handle = 0;
589 }
590
591 static void intel_vgpu_release(struct mdev_device *mdev)
592 {
593 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
594
595 __intel_vgpu_release(vgpu);
596 }
597
598 static void intel_vgpu_release_work(struct work_struct *work)
599 {
600 struct intel_vgpu *vgpu = container_of(work, struct intel_vgpu,
601 vdev.release_work);
602
603 __intel_vgpu_release(vgpu);
604 }
605
606 static uint64_t intel_vgpu_get_bar0_addr(struct intel_vgpu *vgpu)
607 {
608 u32 start_lo, start_hi;
609 u32 mem_type;
610 int pos = PCI_BASE_ADDRESS_0;
611
612 start_lo = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + pos)) &
613 PCI_BASE_ADDRESS_MEM_MASK;
614 mem_type = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + pos)) &
615 PCI_BASE_ADDRESS_MEM_TYPE_MASK;
616
617 switch (mem_type) {
618 case PCI_BASE_ADDRESS_MEM_TYPE_64:
619 start_hi = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space
620 + pos + 4));
621 break;
622 case PCI_BASE_ADDRESS_MEM_TYPE_32:
623 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
624 /* 1M mem BAR treated as 32-bit BAR */
625 default:
626 /* mem unknown type treated as 32-bit BAR */
627 start_hi = 0;
628 break;
629 }
630
631 return ((u64)start_hi << 32) | start_lo;
632 }
633
634 static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
635 size_t count, loff_t *ppos, bool is_write)
636 {
637 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
638 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
639 uint64_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
640 int ret = -EINVAL;
641
642
643 if (index >= VFIO_PCI_NUM_REGIONS) {
644 gvt_vgpu_err("invalid index: %u\n", index);
645 return -EINVAL;
646 }
647
648 switch (index) {
649 case VFIO_PCI_CONFIG_REGION_INDEX:
650 if (is_write)
651 ret = intel_gvt_ops->emulate_cfg_write(vgpu, pos,
652 buf, count);
653 else
654 ret = intel_gvt_ops->emulate_cfg_read(vgpu, pos,
655 buf, count);
656 break;
657 case VFIO_PCI_BAR0_REGION_INDEX:
658 case VFIO_PCI_BAR1_REGION_INDEX:
659 if (is_write) {
660 uint64_t bar0_start = intel_vgpu_get_bar0_addr(vgpu);
661
662 ret = intel_gvt_ops->emulate_mmio_write(vgpu,
663 bar0_start + pos, buf, count);
664 } else {
665 uint64_t bar0_start = intel_vgpu_get_bar0_addr(vgpu);
666
667 ret = intel_gvt_ops->emulate_mmio_read(vgpu,
668 bar0_start + pos, buf, count);
669 }
670 break;
671 case VFIO_PCI_BAR2_REGION_INDEX:
672 case VFIO_PCI_BAR3_REGION_INDEX:
673 case VFIO_PCI_BAR4_REGION_INDEX:
674 case VFIO_PCI_BAR5_REGION_INDEX:
675 case VFIO_PCI_VGA_REGION_INDEX:
676 case VFIO_PCI_ROM_REGION_INDEX:
677 default:
678 gvt_vgpu_err("unsupported region: %u\n", index);
679 }
680
681 return ret == 0 ? count : ret;
682 }
683
684 static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
685 size_t count, loff_t *ppos)
686 {
687 unsigned int done = 0;
688 int ret;
689
690 while (count) {
691 size_t filled;
692
693 if (count >= 4 && !(*ppos % 4)) {
694 u32 val;
695
696 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
697 ppos, false);
698 if (ret <= 0)
699 goto read_err;
700
701 if (copy_to_user(buf, &val, sizeof(val)))
702 goto read_err;
703
704 filled = 4;
705 } else if (count >= 2 && !(*ppos % 2)) {
706 u16 val;
707
708 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
709 ppos, false);
710 if (ret <= 0)
711 goto read_err;
712
713 if (copy_to_user(buf, &val, sizeof(val)))
714 goto read_err;
715
716 filled = 2;
717 } else {
718 u8 val;
719
720 ret = intel_vgpu_rw(mdev, &val, sizeof(val), ppos,
721 false);
722 if (ret <= 0)
723 goto read_err;
724
725 if (copy_to_user(buf, &val, sizeof(val)))
726 goto read_err;
727
728 filled = 1;
729 }
730
731 count -= filled;
732 done += filled;
733 *ppos += filled;
734 buf += filled;
735 }
736
737 return done;
738
739 read_err:
740 return -EFAULT;
741 }
742
743 static ssize_t intel_vgpu_write(struct mdev_device *mdev,
744 const char __user *buf,
745 size_t count, loff_t *ppos)
746 {
747 unsigned int done = 0;
748 int ret;
749
750 while (count) {
751 size_t filled;
752
753 if (count >= 4 && !(*ppos % 4)) {
754 u32 val;
755
756 if (copy_from_user(&val, buf, sizeof(val)))
757 goto write_err;
758
759 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
760 ppos, true);
761 if (ret <= 0)
762 goto write_err;
763
764 filled = 4;
765 } else if (count >= 2 && !(*ppos % 2)) {
766 u16 val;
767
768 if (copy_from_user(&val, buf, sizeof(val)))
769 goto write_err;
770
771 ret = intel_vgpu_rw(mdev, (char *)&val,
772 sizeof(val), ppos, true);
773 if (ret <= 0)
774 goto write_err;
775
776 filled = 2;
777 } else {
778 u8 val;
779
780 if (copy_from_user(&val, buf, sizeof(val)))
781 goto write_err;
782
783 ret = intel_vgpu_rw(mdev, &val, sizeof(val),
784 ppos, true);
785 if (ret <= 0)
786 goto write_err;
787
788 filled = 1;
789 }
790
791 count -= filled;
792 done += filled;
793 *ppos += filled;
794 buf += filled;
795 }
796
797 return done;
798 write_err:
799 return -EFAULT;
800 }
801
802 static int intel_vgpu_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
803 {
804 unsigned int index;
805 u64 virtaddr;
806 unsigned long req_size, pgoff = 0;
807 pgprot_t pg_prot;
808 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
809
810 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
811 if (index >= VFIO_PCI_ROM_REGION_INDEX)
812 return -EINVAL;
813
814 if (vma->vm_end < vma->vm_start)
815 return -EINVAL;
816 if ((vma->vm_flags & VM_SHARED) == 0)
817 return -EINVAL;
818 if (index != VFIO_PCI_BAR2_REGION_INDEX)
819 return -EINVAL;
820
821 pg_prot = vma->vm_page_prot;
822 virtaddr = vma->vm_start;
823 req_size = vma->vm_end - vma->vm_start;
824 pgoff = vgpu_aperture_pa_base(vgpu) >> PAGE_SHIFT;
825
826 return remap_pfn_range(vma, virtaddr, pgoff, req_size, pg_prot);
827 }
828
829 static int intel_vgpu_get_irq_count(struct intel_vgpu *vgpu, int type)
830 {
831 if (type == VFIO_PCI_INTX_IRQ_INDEX || type == VFIO_PCI_MSI_IRQ_INDEX)
832 return 1;
833
834 return 0;
835 }
836
837 static int intel_vgpu_set_intx_mask(struct intel_vgpu *vgpu,
838 unsigned int index, unsigned int start,
839 unsigned int count, uint32_t flags,
840 void *data)
841 {
842 return 0;
843 }
844
845 static int intel_vgpu_set_intx_unmask(struct intel_vgpu *vgpu,
846 unsigned int index, unsigned int start,
847 unsigned int count, uint32_t flags, void *data)
848 {
849 return 0;
850 }
851
852 static int intel_vgpu_set_intx_trigger(struct intel_vgpu *vgpu,
853 unsigned int index, unsigned int start, unsigned int count,
854 uint32_t flags, void *data)
855 {
856 return 0;
857 }
858
859 static int intel_vgpu_set_msi_trigger(struct intel_vgpu *vgpu,
860 unsigned int index, unsigned int start, unsigned int count,
861 uint32_t flags, void *data)
862 {
863 struct eventfd_ctx *trigger;
864
865 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
866 int fd = *(int *)data;
867
868 trigger = eventfd_ctx_fdget(fd);
869 if (IS_ERR(trigger)) {
870 gvt_vgpu_err("eventfd_ctx_fdget failed\n");
871 return PTR_ERR(trigger);
872 }
873 vgpu->vdev.msi_trigger = trigger;
874 }
875
876 return 0;
877 }
878
879 static int intel_vgpu_set_irqs(struct intel_vgpu *vgpu, uint32_t flags,
880 unsigned int index, unsigned int start, unsigned int count,
881 void *data)
882 {
883 int (*func)(struct intel_vgpu *vgpu, unsigned int index,
884 unsigned int start, unsigned int count, uint32_t flags,
885 void *data) = NULL;
886
887 switch (index) {
888 case VFIO_PCI_INTX_IRQ_INDEX:
889 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
890 case VFIO_IRQ_SET_ACTION_MASK:
891 func = intel_vgpu_set_intx_mask;
892 break;
893 case VFIO_IRQ_SET_ACTION_UNMASK:
894 func = intel_vgpu_set_intx_unmask;
895 break;
896 case VFIO_IRQ_SET_ACTION_TRIGGER:
897 func = intel_vgpu_set_intx_trigger;
898 break;
899 }
900 break;
901 case VFIO_PCI_MSI_IRQ_INDEX:
902 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
903 case VFIO_IRQ_SET_ACTION_MASK:
904 case VFIO_IRQ_SET_ACTION_UNMASK:
905 /* XXX Need masking support exported */
906 break;
907 case VFIO_IRQ_SET_ACTION_TRIGGER:
908 func = intel_vgpu_set_msi_trigger;
909 break;
910 }
911 break;
912 }
913
914 if (!func)
915 return -ENOTTY;
916
917 return func(vgpu, index, start, count, flags, data);
918 }
919
920 static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
921 unsigned long arg)
922 {
923 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
924 unsigned long minsz;
925
926 gvt_dbg_core("vgpu%d ioctl, cmd: %d\n", vgpu->id, cmd);
927
928 if (cmd == VFIO_DEVICE_GET_INFO) {
929 struct vfio_device_info info;
930
931 minsz = offsetofend(struct vfio_device_info, num_irqs);
932
933 if (copy_from_user(&info, (void __user *)arg, minsz))
934 return -EFAULT;
935
936 if (info.argsz < minsz)
937 return -EINVAL;
938
939 info.flags = VFIO_DEVICE_FLAGS_PCI;
940 info.flags |= VFIO_DEVICE_FLAGS_RESET;
941 info.num_regions = VFIO_PCI_NUM_REGIONS;
942 info.num_irqs = VFIO_PCI_NUM_IRQS;
943
944 return copy_to_user((void __user *)arg, &info, minsz) ?
945 -EFAULT : 0;
946
947 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
948 struct vfio_region_info info;
949 struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
950 int i, ret;
951 struct vfio_region_info_cap_sparse_mmap *sparse = NULL;
952 size_t size;
953 int nr_areas = 1;
954 int cap_type_id;
955
956 minsz = offsetofend(struct vfio_region_info, offset);
957
958 if (copy_from_user(&info, (void __user *)arg, minsz))
959 return -EFAULT;
960
961 if (info.argsz < minsz)
962 return -EINVAL;
963
964 switch (info.index) {
965 case VFIO_PCI_CONFIG_REGION_INDEX:
966 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
967 info.size = INTEL_GVT_MAX_CFG_SPACE_SZ;
968 info.flags = VFIO_REGION_INFO_FLAG_READ |
969 VFIO_REGION_INFO_FLAG_WRITE;
970 break;
971 case VFIO_PCI_BAR0_REGION_INDEX:
972 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
973 info.size = vgpu->cfg_space.bar[info.index].size;
974 if (!info.size) {
975 info.flags = 0;
976 break;
977 }
978
979 info.flags = VFIO_REGION_INFO_FLAG_READ |
980 VFIO_REGION_INFO_FLAG_WRITE;
981 break;
982 case VFIO_PCI_BAR1_REGION_INDEX:
983 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
984 info.size = 0;
985 info.flags = 0;
986 break;
987 case VFIO_PCI_BAR2_REGION_INDEX:
988 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
989 info.flags = VFIO_REGION_INFO_FLAG_CAPS |
990 VFIO_REGION_INFO_FLAG_MMAP |
991 VFIO_REGION_INFO_FLAG_READ |
992 VFIO_REGION_INFO_FLAG_WRITE;
993 info.size = gvt_aperture_sz(vgpu->gvt);
994
995 size = sizeof(*sparse) +
996 (nr_areas * sizeof(*sparse->areas));
997 sparse = kzalloc(size, GFP_KERNEL);
998 if (!sparse)
999 return -ENOMEM;
1000
1001 sparse->nr_areas = nr_areas;
1002 cap_type_id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
1003 sparse->areas[0].offset =
1004 PAGE_ALIGN(vgpu_aperture_offset(vgpu));
1005 sparse->areas[0].size = vgpu_aperture_sz(vgpu);
1006 break;
1007
1008 case VFIO_PCI_BAR3_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
1009 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1010 info.size = 0;
1011
1012 info.flags = 0;
1013 gvt_dbg_core("get region info bar:%d\n", info.index);
1014 break;
1015
1016 case VFIO_PCI_ROM_REGION_INDEX:
1017 case VFIO_PCI_VGA_REGION_INDEX:
1018 gvt_dbg_core("get region info index:%d\n", info.index);
1019 break;
1020 default:
1021 {
1022 struct vfio_region_info_cap_type cap_type;
1023
1024 if (info.index >= VFIO_PCI_NUM_REGIONS +
1025 vgpu->vdev.num_regions)
1026 return -EINVAL;
1027
1028 i = info.index - VFIO_PCI_NUM_REGIONS;
1029
1030 info.offset =
1031 VFIO_PCI_INDEX_TO_OFFSET(info.index);
1032 info.size = vgpu->vdev.region[i].size;
1033 info.flags = vgpu->vdev.region[i].flags;
1034
1035 cap_type.type = vgpu->vdev.region[i].type;
1036 cap_type.subtype = vgpu->vdev.region[i].subtype;
1037
1038 ret = vfio_info_add_capability(&caps,
1039 VFIO_REGION_INFO_CAP_TYPE,
1040 &cap_type);
1041 if (ret)
1042 return ret;
1043 }
1044 }
1045
1046 if ((info.flags & VFIO_REGION_INFO_FLAG_CAPS) && sparse) {
1047 switch (cap_type_id) {
1048 case VFIO_REGION_INFO_CAP_SPARSE_MMAP:
1049 ret = vfio_info_add_capability(&caps,
1050 VFIO_REGION_INFO_CAP_SPARSE_MMAP,
1051 sparse);
1052 kfree(sparse);
1053 if (ret)
1054 return ret;
1055 break;
1056 default:
1057 return -EINVAL;
1058 }
1059 }
1060
1061 if (caps.size) {
1062 if (info.argsz < sizeof(info) + caps.size) {
1063 info.argsz = sizeof(info) + caps.size;
1064 info.cap_offset = 0;
1065 } else {
1066 vfio_info_cap_shift(&caps, sizeof(info));
1067 if (copy_to_user((void __user *)arg +
1068 sizeof(info), caps.buf,
1069 caps.size)) {
1070 kfree(caps.buf);
1071 return -EFAULT;
1072 }
1073 info.cap_offset = sizeof(info);
1074 }
1075
1076 kfree(caps.buf);
1077 }
1078
1079 return copy_to_user((void __user *)arg, &info, minsz) ?
1080 -EFAULT : 0;
1081 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
1082 struct vfio_irq_info info;
1083
1084 minsz = offsetofend(struct vfio_irq_info, count);
1085
1086 if (copy_from_user(&info, (void __user *)arg, minsz))
1087 return -EFAULT;
1088
1089 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
1090 return -EINVAL;
1091
1092 switch (info.index) {
1093 case VFIO_PCI_INTX_IRQ_INDEX:
1094 case VFIO_PCI_MSI_IRQ_INDEX:
1095 break;
1096 default:
1097 return -EINVAL;
1098 }
1099
1100 info.flags = VFIO_IRQ_INFO_EVENTFD;
1101
1102 info.count = intel_vgpu_get_irq_count(vgpu, info.index);
1103
1104 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
1105 info.flags |= (VFIO_IRQ_INFO_MASKABLE |
1106 VFIO_IRQ_INFO_AUTOMASKED);
1107 else
1108 info.flags |= VFIO_IRQ_INFO_NORESIZE;
1109
1110 return copy_to_user((void __user *)arg, &info, minsz) ?
1111 -EFAULT : 0;
1112 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
1113 struct vfio_irq_set hdr;
1114 u8 *data = NULL;
1115 int ret = 0;
1116 size_t data_size = 0;
1117
1118 minsz = offsetofend(struct vfio_irq_set, count);
1119
1120 if (copy_from_user(&hdr, (void __user *)arg, minsz))
1121 return -EFAULT;
1122
1123 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
1124 int max = intel_vgpu_get_irq_count(vgpu, hdr.index);
1125
1126 ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
1127 VFIO_PCI_NUM_IRQS, &data_size);
1128 if (ret) {
1129 gvt_vgpu_err("intel:vfio_set_irqs_validate_and_prepare failed\n");
1130 return -EINVAL;
1131 }
1132 if (data_size) {
1133 data = memdup_user((void __user *)(arg + minsz),
1134 data_size);
1135 if (IS_ERR(data))
1136 return PTR_ERR(data);
1137 }
1138 }
1139
1140 ret = intel_vgpu_set_irqs(vgpu, hdr.flags, hdr.index,
1141 hdr.start, hdr.count, data);
1142 kfree(data);
1143
1144 return ret;
1145 } else if (cmd == VFIO_DEVICE_RESET) {
1146 intel_gvt_ops->vgpu_reset(vgpu);
1147 return 0;
1148 }
1149
1150 return 0;
1151 }
1152
1153 static const struct mdev_parent_ops intel_vgpu_ops = {
1154 .supported_type_groups = intel_vgpu_type_groups,
1155 .create = intel_vgpu_create,
1156 .remove = intel_vgpu_remove,
1157
1158 .open = intel_vgpu_open,
1159 .release = intel_vgpu_release,
1160
1161 .read = intel_vgpu_read,
1162 .write = intel_vgpu_write,
1163 .mmap = intel_vgpu_mmap,
1164 .ioctl = intel_vgpu_ioctl,
1165 };
1166
1167 static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
1168 {
1169 if (!intel_gvt_init_vgpu_type_groups(gvt))
1170 return -EFAULT;
1171
1172 intel_gvt_ops = ops;
1173
1174 return mdev_register_device(dev, &intel_vgpu_ops);
1175 }
1176
1177 static void kvmgt_host_exit(struct device *dev, void *gvt)
1178 {
1179 intel_gvt_cleanup_vgpu_type_groups(gvt);
1180 mdev_unregister_device(dev);
1181 }
1182
1183 static int kvmgt_write_protect_add(unsigned long handle, u64 gfn)
1184 {
1185 struct kvmgt_guest_info *info;
1186 struct kvm *kvm;
1187 struct kvm_memory_slot *slot;
1188 int idx;
1189
1190 if (!handle_valid(handle))
1191 return -ESRCH;
1192
1193 info = (struct kvmgt_guest_info *)handle;
1194 kvm = info->kvm;
1195
1196 idx = srcu_read_lock(&kvm->srcu);
1197 slot = gfn_to_memslot(kvm, gfn);
1198 if (!slot) {
1199 srcu_read_unlock(&kvm->srcu, idx);
1200 return -EINVAL;
1201 }
1202
1203 spin_lock(&kvm->mmu_lock);
1204
1205 if (kvmgt_gfn_is_write_protected(info, gfn))
1206 goto out;
1207
1208 kvm_slot_page_track_add_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
1209 kvmgt_protect_table_add(info, gfn);
1210
1211 out:
1212 spin_unlock(&kvm->mmu_lock);
1213 srcu_read_unlock(&kvm->srcu, idx);
1214 return 0;
1215 }
1216
1217 static int kvmgt_write_protect_remove(unsigned long handle, u64 gfn)
1218 {
1219 struct kvmgt_guest_info *info;
1220 struct kvm *kvm;
1221 struct kvm_memory_slot *slot;
1222 int idx;
1223
1224 if (!handle_valid(handle))
1225 return 0;
1226
1227 info = (struct kvmgt_guest_info *)handle;
1228 kvm = info->kvm;
1229
1230 idx = srcu_read_lock(&kvm->srcu);
1231 slot = gfn_to_memslot(kvm, gfn);
1232 if (!slot) {
1233 srcu_read_unlock(&kvm->srcu, idx);
1234 return -EINVAL;
1235 }
1236
1237 spin_lock(&kvm->mmu_lock);
1238
1239 if (!kvmgt_gfn_is_write_protected(info, gfn))
1240 goto out;
1241
1242 kvm_slot_page_track_remove_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
1243 kvmgt_protect_table_del(info, gfn);
1244
1245 out:
1246 spin_unlock(&kvm->mmu_lock);
1247 srcu_read_unlock(&kvm->srcu, idx);
1248 return 0;
1249 }
1250
1251 static void kvmgt_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa,
1252 const u8 *val, int len,
1253 struct kvm_page_track_notifier_node *node)
1254 {
1255 struct kvmgt_guest_info *info = container_of(node,
1256 struct kvmgt_guest_info, track_node);
1257
1258 if (kvmgt_gfn_is_write_protected(info, gpa_to_gfn(gpa)))
1259 intel_gvt_ops->emulate_mmio_write(info->vgpu, gpa,
1260 (void *)val, len);
1261 }
1262
1263 static void kvmgt_page_track_flush_slot(struct kvm *kvm,
1264 struct kvm_memory_slot *slot,
1265 struct kvm_page_track_notifier_node *node)
1266 {
1267 int i;
1268 gfn_t gfn;
1269 struct kvmgt_guest_info *info = container_of(node,
1270 struct kvmgt_guest_info, track_node);
1271
1272 spin_lock(&kvm->mmu_lock);
1273 for (i = 0; i < slot->npages; i++) {
1274 gfn = slot->base_gfn + i;
1275 if (kvmgt_gfn_is_write_protected(info, gfn)) {
1276 kvm_slot_page_track_remove_page(kvm, slot, gfn,
1277 KVM_PAGE_TRACK_WRITE);
1278 kvmgt_protect_table_del(info, gfn);
1279 }
1280 }
1281 spin_unlock(&kvm->mmu_lock);
1282 }
1283
1284 static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
1285 {
1286 struct intel_vgpu *itr;
1287 struct kvmgt_guest_info *info;
1288 int id;
1289 bool ret = false;
1290
1291 mutex_lock(&vgpu->gvt->lock);
1292 for_each_active_vgpu(vgpu->gvt, itr, id) {
1293 if (!handle_valid(itr->handle))
1294 continue;
1295
1296 info = (struct kvmgt_guest_info *)itr->handle;
1297 if (kvm && kvm == info->kvm) {
1298 ret = true;
1299 goto out;
1300 }
1301 }
1302 out:
1303 mutex_unlock(&vgpu->gvt->lock);
1304 return ret;
1305 }
1306
1307 static int kvmgt_guest_init(struct mdev_device *mdev)
1308 {
1309 struct kvmgt_guest_info *info;
1310 struct intel_vgpu *vgpu;
1311 struct kvm *kvm;
1312
1313 vgpu = mdev_get_drvdata(mdev);
1314 if (handle_valid(vgpu->handle))
1315 return -EEXIST;
1316
1317 kvm = vgpu->vdev.kvm;
1318 if (!kvm || kvm->mm != current->mm) {
1319 gvt_vgpu_err("KVM is required to use Intel vGPU\n");
1320 return -ESRCH;
1321 }
1322
1323 if (__kvmgt_vgpu_exist(vgpu, kvm))
1324 return -EEXIST;
1325
1326 info = vzalloc(sizeof(struct kvmgt_guest_info));
1327 if (!info)
1328 return -ENOMEM;
1329
1330 vgpu->handle = (unsigned long)info;
1331 info->vgpu = vgpu;
1332 info->kvm = kvm;
1333 kvm_get_kvm(info->kvm);
1334
1335 kvmgt_protect_table_init(info);
1336 gvt_cache_init(vgpu);
1337
1338 info->track_node.track_write = kvmgt_page_track_write;
1339 info->track_node.track_flush_slot = kvmgt_page_track_flush_slot;
1340 kvm_page_track_register_notifier(kvm, &info->track_node);
1341
1342 return 0;
1343 }
1344
1345 static bool kvmgt_guest_exit(struct kvmgt_guest_info *info)
1346 {
1347 kvm_page_track_unregister_notifier(info->kvm, &info->track_node);
1348 kvm_put_kvm(info->kvm);
1349 kvmgt_protect_table_destroy(info);
1350 gvt_cache_destroy(info->vgpu);
1351 vfree(info);
1352
1353 return true;
1354 }
1355
1356 static int kvmgt_attach_vgpu(void *vgpu, unsigned long *handle)
1357 {
1358 /* nothing to do here */
1359 return 0;
1360 }
1361
1362 static void kvmgt_detach_vgpu(unsigned long handle)
1363 {
1364 /* nothing to do here */
1365 }
1366
1367 static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data)
1368 {
1369 struct kvmgt_guest_info *info;
1370 struct intel_vgpu *vgpu;
1371
1372 if (!handle_valid(handle))
1373 return -ESRCH;
1374
1375 info = (struct kvmgt_guest_info *)handle;
1376 vgpu = info->vgpu;
1377
1378 if (eventfd_signal(vgpu->vdev.msi_trigger, 1) == 1)
1379 return 0;
1380
1381 return -EFAULT;
1382 }
1383
1384 static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
1385 {
1386 unsigned long iova, pfn;
1387 struct kvmgt_guest_info *info;
1388 struct device *dev;
1389 struct intel_vgpu *vgpu;
1390 int rc;
1391
1392 if (!handle_valid(handle))
1393 return INTEL_GVT_INVALID_ADDR;
1394
1395 info = (struct kvmgt_guest_info *)handle;
1396 vgpu = info->vgpu;
1397 iova = gvt_cache_find(info->vgpu, gfn);
1398 if (iova != INTEL_GVT_INVALID_ADDR)
1399 return iova;
1400
1401 pfn = INTEL_GVT_INVALID_ADDR;
1402 dev = mdev_dev(info->vgpu->vdev.mdev);
1403 rc = vfio_pin_pages(dev, &gfn, 1, IOMMU_READ | IOMMU_WRITE, &pfn);
1404 if (rc != 1) {
1405 gvt_vgpu_err("vfio_pin_pages failed for gfn 0x%lx: %d\n",
1406 gfn, rc);
1407 return INTEL_GVT_INVALID_ADDR;
1408 }
1409 /* transfer to host iova for GFX to use DMA */
1410 rc = gvt_dma_map_iova(info->vgpu, pfn, &iova);
1411 if (rc) {
1412 gvt_vgpu_err("gvt_dma_map_iova failed for gfn: 0x%lx\n", gfn);
1413 vfio_unpin_pages(dev, &gfn, 1);
1414 return INTEL_GVT_INVALID_ADDR;
1415 }
1416
1417 gvt_cache_add(info->vgpu, gfn, iova);
1418 return iova;
1419 }
1420
1421 static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa,
1422 void *buf, unsigned long len, bool write)
1423 {
1424 struct kvmgt_guest_info *info;
1425 struct kvm *kvm;
1426 int idx, ret;
1427 bool kthread = current->mm == NULL;
1428
1429 if (!handle_valid(handle))
1430 return -ESRCH;
1431
1432 info = (struct kvmgt_guest_info *)handle;
1433 kvm = info->kvm;
1434
1435 if (kthread)
1436 use_mm(kvm->mm);
1437
1438 idx = srcu_read_lock(&kvm->srcu);
1439 ret = write ? kvm_write_guest(kvm, gpa, buf, len) :
1440 kvm_read_guest(kvm, gpa, buf, len);
1441 srcu_read_unlock(&kvm->srcu, idx);
1442
1443 if (kthread)
1444 unuse_mm(kvm->mm);
1445
1446 return ret;
1447 }
1448
1449 static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa,
1450 void *buf, unsigned long len)
1451 {
1452 return kvmgt_rw_gpa(handle, gpa, buf, len, false);
1453 }
1454
1455 static int kvmgt_write_gpa(unsigned long handle, unsigned long gpa,
1456 void *buf, unsigned long len)
1457 {
1458 return kvmgt_rw_gpa(handle, gpa, buf, len, true);
1459 }
1460
1461 static unsigned long kvmgt_virt_to_pfn(void *addr)
1462 {
1463 return PFN_DOWN(__pa(addr));
1464 }
1465
1466 struct intel_gvt_mpt kvmgt_mpt = {
1467 .host_init = kvmgt_host_init,
1468 .host_exit = kvmgt_host_exit,
1469 .attach_vgpu = kvmgt_attach_vgpu,
1470 .detach_vgpu = kvmgt_detach_vgpu,
1471 .inject_msi = kvmgt_inject_msi,
1472 .from_virt_to_mfn = kvmgt_virt_to_pfn,
1473 .set_wp_page = kvmgt_write_protect_add,
1474 .unset_wp_page = kvmgt_write_protect_remove,
1475 .read_gpa = kvmgt_read_gpa,
1476 .write_gpa = kvmgt_write_gpa,
1477 .gfn_to_mfn = kvmgt_gfn_to_pfn,
1478 };
1479 EXPORT_SYMBOL_GPL(kvmgt_mpt);
1480
1481 static int __init kvmgt_init(void)
1482 {
1483 return 0;
1484 }
1485
1486 static void __exit kvmgt_exit(void)
1487 {
1488 }
1489
1490 module_init(kvmgt_init);
1491 module_exit(kvmgt_exit);
1492
1493 MODULE_LICENSE("GPL and additional rights");
1494 MODULE_AUTHOR("Intel Corporation");
ubuntu-bionic-kernel mirror