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");