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/sched/mm.h>
  36 #include <linux/types.h>
  37 #include <linux/list.h>
  38 #include <linux/rbtree.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/eventfd.h>
  41 #include <linux/uuid.h>
  42 #include <linux/kvm_host.h>
  43 #include <linux/vfio.h>
  44 #include <linux/mdev.h>
  45 #include <linux/debugfs.h>
  46
  47 #include <linux/nospec.h>
  48
  49 #include "i915_drv.h"
  50 #include "gvt.h"
  51
  52 static const struct intel_gvt_ops *intel_gvt_ops;
  53
  54 /* helper macros copied from vfio-pci */
  55 #define VFIO_PCI_OFFSET_SHIFT   40
  56 #define VFIO_PCI_OFFSET_TO_INDEX(off)   (off >> VFIO_PCI_OFFSET_SHIFT)
  57 #define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
  58 #define VFIO_PCI_OFFSET_MASK    (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
  59
  60 #define EDID_BLOB_OFFSET (PAGE_SIZE/2)
  61
  62 #define OPREGION_SIGNATURE "IntelGraphicsMem"
  63
  64 struct vfio_region;
  65 struct intel_vgpu_regops {
  66         size_t (*rw)(struct intel_vgpu *vgpu, char *buf,
  67                         size_t count, loff_t *ppos, bool iswrite);
  68         void (*release)(struct intel_vgpu *vgpu,
  69                         struct vfio_region *region);
  70 };
  71
  72 struct vfio_region {
  73         u32                             type;
  74         u32                             subtype;
  75         size_t                          size;
  76         u32                             flags;
  77         const struct intel_vgpu_regops  *ops;
  78         void                            *data;
  79 };
  80
  81 struct vfio_edid_region {
  82         struct vfio_region_gfx_edid vfio_edid_regs;
  83         void *edid_blob;
  84 };
  85
  86 struct kvmgt_pgfn {
  87         gfn_t gfn;
  88         struct hlist_node hnode;
  89 };
  90
  91 struct kvmgt_guest_info {
  92         struct kvm *kvm;
  93         struct intel_vgpu *vgpu;
  94         struct kvm_page_track_notifier_node track_node;
  95 #define NR_BKT (1 << 18)
  96         struct hlist_head ptable[NR_BKT];
  97 #undef NR_BKT
  98         struct dentry *debugfs_cache_entries;
  99 };
 100
 101 struct gvt_dma {
 102         struct intel_vgpu *vgpu;
 103         struct rb_node gfn_node;
 104         struct rb_node dma_addr_node;
 105         gfn_t gfn;
 106         dma_addr_t dma_addr;
 107         unsigned long size;
 108         struct kref ref;
 109 };
 110
 111 static inline bool handle_valid(unsigned long handle)
 112 {
 113         return !!(handle & ~0xff);
 114 }
 115
 116 static int kvmgt_guest_init(struct mdev_device *mdev);
 117 static void intel_vgpu_release_work(struct work_struct *work);
 118 static bool kvmgt_guest_exit(struct kvmgt_guest_info *info);
 119
 120 static void gvt_unpin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
 121                 unsigned long size)
 122 {
 123         int total_pages;
 124         int npage;
 125         int ret;
 126
 127         total_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
 128
 129         for (npage = 0; npage < total_pages; npage++) {
 130                 unsigned long cur_gfn = gfn + npage;
 131
 132                 ret = vfio_unpin_pages(mdev_dev(vgpu->vdev.mdev), &cur_gfn, 1);
 133                 WARN_ON(ret != 1);
 134         }
 135 }
 136
 137 /* Pin a normal or compound guest page for dma. */
 138 static int gvt_pin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
 139                 unsigned long size, struct page **page)
 140 {
 141         unsigned long base_pfn = 0;
 142         int total_pages;
 143         int npage;
 144         int ret;
 145
 146         total_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
 147         /*
 148          * We pin the pages one-by-one to avoid allocating a big arrary
 149          * on stack to hold pfns.
 150          */
 151         for (npage = 0; npage < total_pages; npage++) {
 152                 unsigned long cur_gfn = gfn + npage;
 153                 unsigned long pfn;
 154
 155                 ret = vfio_pin_pages(mdev_dev(vgpu->vdev.mdev), &cur_gfn, 1,
 156                                      IOMMU_READ | IOMMU_WRITE, &pfn);
 157                 if (ret != 1) {
 158                         gvt_vgpu_err("vfio_pin_pages failed for gfn 0x%lx, ret %d\n",
 159                                      cur_gfn, ret);
 160                         goto err;
 161                 }
 162
 163                 if (!pfn_valid(pfn)) {
 164                         gvt_vgpu_err("pfn 0x%lx is not mem backed\n", pfn);
 165                         npage++;
 166                         ret = -EFAULT;
 167                         goto err;
 168                 }
 169
 170                 if (npage == 0)
 171                         base_pfn = pfn;
 172                 else if (base_pfn + npage != pfn) {
 173                         gvt_vgpu_err("The pages are not continuous\n");
 174                         ret = -EINVAL;
 175                         npage++;
 176                         goto err;
 177                 }
 178         }
 179
 180         *page = pfn_to_page(base_pfn);
 181         return 0;
 182 err:
 183         gvt_unpin_guest_page(vgpu, gfn, npage * PAGE_SIZE);
 184         return ret;
 185 }
 186
 187 static int gvt_dma_map_page(struct intel_vgpu *vgpu, unsigned long gfn,
 188                 dma_addr_t *dma_addr, unsigned long size)
 189 {
 190         struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
 191         struct page *page = NULL;
 192         int ret;
 193
 194         ret = gvt_pin_guest_page(vgpu, gfn, size, &page);
 195         if (ret)
 196                 return ret;
 197
 198         /* Setup DMA mapping. */
 199         *dma_addr = dma_map_page(dev, page, 0, size, PCI_DMA_BIDIRECTIONAL);
 200         if (dma_mapping_error(dev, *dma_addr)) {
 201                 gvt_vgpu_err("DMA mapping failed for pfn 0x%lx, ret %d\n",
 202                              page_to_pfn(page), ret);
 203                 gvt_unpin_guest_page(vgpu, gfn, size);
 204                 return -ENOMEM;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static void gvt_dma_unmap_page(struct intel_vgpu *vgpu, unsigned long gfn,
 211                 dma_addr_t dma_addr, unsigned long size)
 212 {
 213         struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
 214
 215         dma_unmap_page(dev, dma_addr, size, PCI_DMA_BIDIRECTIONAL);
 216         gvt_unpin_guest_page(vgpu, gfn, size);
 217 }
 218
 219 static struct gvt_dma *__gvt_cache_find_dma_addr(struct intel_vgpu *vgpu,
 220                 dma_addr_t dma_addr)
 221 {
 222         struct rb_node *node = vgpu->vdev.dma_addr_cache.rb_node;
 223         struct gvt_dma *itr;
 224
 225         while (node) {
 226                 itr = rb_entry(node, struct gvt_dma, dma_addr_node);
 227
 228                 if (dma_addr < itr->dma_addr)
 229                         node = node->rb_left;
 230                 else if (dma_addr > itr->dma_addr)
 231                         node = node->rb_right;
 232                 else
 233                         return itr;
 234         }
 235         return NULL;
 236 }
 237
 238 static struct gvt_dma *__gvt_cache_find_gfn(struct intel_vgpu *vgpu, gfn_t gfn)
 239 {
 240         struct rb_node *node = vgpu->vdev.gfn_cache.rb_node;
 241         struct gvt_dma *itr;
 242
 243         while (node) {
 244                 itr = rb_entry(node, struct gvt_dma, gfn_node);
 245
 246                 if (gfn < itr->gfn)
 247                         node = node->rb_left;
 248                 else if (gfn > itr->gfn)
 249                         node = node->rb_right;
 250                 else
 251                         return itr;
 252         }
 253         return NULL;
 254 }
 255
 256 static int __gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
 257                 dma_addr_t dma_addr, unsigned long size)
 258 {
 259         struct gvt_dma *new, *itr;
 260         struct rb_node **link, *parent = NULL;
 261
 262         new = kzalloc(sizeof(struct gvt_dma), GFP_KERNEL);
 263         if (!new)
 264                 return -ENOMEM;
 265
 266         new->vgpu = vgpu;
 267         new->gfn = gfn;
 268         new->dma_addr = dma_addr;
 269         new->size = size;
 270         kref_init(&new->ref);
 271
 272         /* gfn_cache maps gfn to struct gvt_dma. */
 273         link = &vgpu->vdev.gfn_cache.rb_node;
 274         while (*link) {
 275                 parent = *link;
 276                 itr = rb_entry(parent, struct gvt_dma, gfn_node);
 277
 278                 if (gfn < itr->gfn)
 279                         link = &parent->rb_left;
 280                 else
 281                         link = &parent->rb_right;
 282         }
 283         rb_link_node(&new->gfn_node, parent, link);
 284         rb_insert_color(&new->gfn_node, &vgpu->vdev.gfn_cache);
 285
 286         /* dma_addr_cache maps dma addr to struct gvt_dma. */
 287         parent = NULL;
 288         link = &vgpu->vdev.dma_addr_cache.rb_node;
 289         while (*link) {
 290                 parent = *link;
 291                 itr = rb_entry(parent, struct gvt_dma, dma_addr_node);
 292
 293                 if (dma_addr < itr->dma_addr)
 294                         link = &parent->rb_left;
 295                 else
 296                         link = &parent->rb_right;
 297         }
 298         rb_link_node(&new->dma_addr_node, parent, link);
 299         rb_insert_color(&new->dma_addr_node, &vgpu->vdev.dma_addr_cache);
 300
 301         vgpu->vdev.nr_cache_entries++;
 302         return 0;
 303 }
 304
 305 static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
 306                                 struct gvt_dma *entry)
 307 {
 308         rb_erase(&entry->gfn_node, &vgpu->vdev.gfn_cache);
 309         rb_erase(&entry->dma_addr_node, &vgpu->vdev.dma_addr_cache);
 310         kfree(entry);
 311         vgpu->vdev.nr_cache_entries--;
 312 }
 313
 314 static void gvt_cache_destroy(struct intel_vgpu *vgpu)
 315 {
 316         struct gvt_dma *dma;
 317         struct rb_node *node = NULL;
 318
 319         for (;;) {
 320                 mutex_lock(&vgpu->vdev.cache_lock);
 321                 node = rb_first(&vgpu->vdev.gfn_cache);
 322                 if (!node) {
 323                         mutex_unlock(&vgpu->vdev.cache_lock);
 324                         break;
 325                 }
 326                 dma = rb_entry(node, struct gvt_dma, gfn_node);
 327                 gvt_dma_unmap_page(vgpu, dma->gfn, dma->dma_addr, dma->size);
 328                 __gvt_cache_remove_entry(vgpu, dma);
 329                 mutex_unlock(&vgpu->vdev.cache_lock);
 330         }
 331 }
 332
 333 static void gvt_cache_init(struct intel_vgpu *vgpu)
 334 {
 335         vgpu->vdev.gfn_cache = RB_ROOT;
 336         vgpu->vdev.dma_addr_cache = RB_ROOT;
 337         vgpu->vdev.nr_cache_entries = 0;
 338         mutex_init(&vgpu->vdev.cache_lock);
 339 }
 340
 341 static void kvmgt_protect_table_init(struct kvmgt_guest_info *info)
 342 {
 343         hash_init(info->ptable);
 344 }
 345
 346 static void kvmgt_protect_table_destroy(struct kvmgt_guest_info *info)
 347 {
 348         struct kvmgt_pgfn *p;
 349         struct hlist_node *tmp;
 350         int i;
 351
 352         hash_for_each_safe(info->ptable, i, tmp, p, hnode) {
 353                 hash_del(&p->hnode);
 354                 kfree(p);
 355         }
 356 }
 357
 358 static struct kvmgt_pgfn *
 359 __kvmgt_protect_table_find(struct kvmgt_guest_info *info, gfn_t gfn)
 360 {
 361         struct kvmgt_pgfn *p, *res = NULL;
 362
 363         hash_for_each_possible(info->ptable, p, hnode, gfn) {
 364                 if (gfn == p->gfn) {
 365                         res = p;
 366                         break;
 367                 }
 368         }
 369
 370         return res;
 371 }
 372
 373 static bool kvmgt_gfn_is_write_protected(struct kvmgt_guest_info *info,
 374                                 gfn_t gfn)
 375 {
 376         struct kvmgt_pgfn *p;
 377
 378         p = __kvmgt_protect_table_find(info, gfn);
 379         return !!p;
 380 }
 381
 382 static void kvmgt_protect_table_add(struct kvmgt_guest_info *info, gfn_t gfn)
 383 {
 384         struct kvmgt_pgfn *p;
 385
 386         if (kvmgt_gfn_is_write_protected(info, gfn))
 387                 return;
 388
 389         p = kzalloc(sizeof(struct kvmgt_pgfn), GFP_ATOMIC);
 390         if (WARN(!p, "gfn: 0x%llx\n", gfn))
 391                 return;
 392
 393         p->gfn = gfn;
 394         hash_add(info->ptable, &p->hnode, gfn);
 395 }
 396
 397 static void kvmgt_protect_table_del(struct kvmgt_guest_info *info,
 398                                 gfn_t gfn)
 399 {
 400         struct kvmgt_pgfn *p;
 401
 402         p = __kvmgt_protect_table_find(info, gfn);
 403         if (p) {
 404                 hash_del(&p->hnode);
 405                 kfree(p);
 406         }
 407 }
 408
 409 static size_t intel_vgpu_reg_rw_opregion(struct intel_vgpu *vgpu, char *buf,
 410                 size_t count, loff_t *ppos, bool iswrite)
 411 {
 412         unsigned int i = VFIO_PCI_OFFSET_TO_INDEX(*ppos) -
 413                         VFIO_PCI_NUM_REGIONS;
 414         void *base = vgpu->vdev.region[i].data;
 415         loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
 416
 417         if (pos >= vgpu->vdev.region[i].size || iswrite) {
 418                 gvt_vgpu_err("invalid op or offset for Intel vgpu OpRegion\n");
 419                 return -EINVAL;
 420         }
 421         count = min(count, (size_t)(vgpu->vdev.region[i].size - pos));
 422         memcpy(buf, base + pos, count);
 423
 424         return count;
 425 }
 426
 427 static void intel_vgpu_reg_release_opregion(struct intel_vgpu *vgpu,
 428                 struct vfio_region *region)
 429 {
 430 }
 431
 432 static const struct intel_vgpu_regops intel_vgpu_regops_opregion = {
 433         .rw = intel_vgpu_reg_rw_opregion,
 434         .release = intel_vgpu_reg_release_opregion,
 435 };
 436
 437 static int handle_edid_regs(struct intel_vgpu *vgpu,
 438                         struct vfio_edid_region *region, char *buf,
 439                         size_t count, u16 offset, bool is_write)
 440 {
 441         struct vfio_region_gfx_edid *regs = &region->vfio_edid_regs;
 442         unsigned int data;
 443
 444         if (offset + count > sizeof(*regs))
 445                 return -EINVAL;
 446
 447         if (count != 4)
 448                 return -EINVAL;
 449
 450         if (is_write) {
 451                 data = *((unsigned int *)buf);
 452                 switch (offset) {
 453                 case offsetof(struct vfio_region_gfx_edid, link_state):
 454                         if (data == VFIO_DEVICE_GFX_LINK_STATE_UP) {
 455                                 if (!drm_edid_block_valid(
 456                                         (u8 *)region->edid_blob,
 457                                         0,
 458                                         true,
 459                                         NULL)) {
 460                                         gvt_vgpu_err("invalid EDID blob\n");
 461                                         return -EINVAL;
 462                                 }
 463                                 intel_gvt_ops->emulate_hotplug(vgpu, true);
 464                         } else if (data == VFIO_DEVICE_GFX_LINK_STATE_DOWN)
 465                                 intel_gvt_ops->emulate_hotplug(vgpu, false);
 466                         else {
 467                                 gvt_vgpu_err("invalid EDID link state %d\n",
 468                                         regs->link_state);
 469                                 return -EINVAL;
 470                         }
 471                         regs->link_state = data;
 472                         break;
 473                 case offsetof(struct vfio_region_gfx_edid, edid_size):
 474                         if (data > regs->edid_max_size) {
 475                                 gvt_vgpu_err("EDID size is bigger than %d!\n",
 476                                         regs->edid_max_size);
 477                                 return -EINVAL;
 478                         }
 479                         regs->edid_size = data;
 480                         break;
 481                 default:
 482                         /* read-only regs */
 483                         gvt_vgpu_err("write read-only EDID region at offset %d\n",
 484                                 offset);
 485                         return -EPERM;
 486                 }
 487         } else {
 488                 memcpy(buf, (char *)regs + offset, count);
 489         }
 490
 491         return count;
 492 }
 493
 494 static int handle_edid_blob(struct vfio_edid_region *region, char *buf,
 495                         size_t count, u16 offset, bool is_write)
 496 {
 497         if (offset + count > region->vfio_edid_regs.edid_size)
 498                 return -EINVAL;
 499
 500         if (is_write)
 501                 memcpy(region->edid_blob + offset, buf, count);
 502         else
 503                 memcpy(buf, region->edid_blob + offset, count);
 504
 505         return count;
 506 }
 507
 508 static size_t intel_vgpu_reg_rw_edid(struct intel_vgpu *vgpu, char *buf,
 509                 size_t count, loff_t *ppos, bool iswrite)
 510 {
 511         int ret;
 512         unsigned int i = VFIO_PCI_OFFSET_TO_INDEX(*ppos) -
 513                         VFIO_PCI_NUM_REGIONS;
 514         struct vfio_edid_region *region =
 515                 (struct vfio_edid_region *)vgpu->vdev.region[i].data;
 516         loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
 517
 518         if (pos < region->vfio_edid_regs.edid_offset) {
 519                 ret = handle_edid_regs(vgpu, region, buf, count, pos, iswrite);
 520         } else {
 521                 pos -= EDID_BLOB_OFFSET;
 522                 ret = handle_edid_blob(region, buf, count, pos, iswrite);
 523         }
 524
 525         if (ret < 0)
 526                 gvt_vgpu_err("failed to access EDID region\n");
 527
 528         return ret;
 529 }
 530
 531 static void intel_vgpu_reg_release_edid(struct intel_vgpu *vgpu,
 532                                         struct vfio_region *region)
 533 {
 534         kfree(region->data);
 535 }
 536
 537 static const struct intel_vgpu_regops intel_vgpu_regops_edid = {
 538         .rw = intel_vgpu_reg_rw_edid,
 539         .release = intel_vgpu_reg_release_edid,
 540 };
 541
 542 static int intel_vgpu_register_reg(struct intel_vgpu *vgpu,
 543                 unsigned int type, unsigned int subtype,
 544                 const struct intel_vgpu_regops *ops,
 545                 size_t size, u32 flags, void *data)
 546 {
 547         struct vfio_region *region;
 548
 549         region = krealloc(vgpu->vdev.region,
 550                         (vgpu->vdev.num_regions + 1) * sizeof(*region),
 551                         GFP_KERNEL);
 552         if (!region)
 553                 return -ENOMEM;
 554
 555         vgpu->vdev.region = region;
 556         vgpu->vdev.region[vgpu->vdev.num_regions].type = type;
 557         vgpu->vdev.region[vgpu->vdev.num_regions].subtype = subtype;
 558         vgpu->vdev.region[vgpu->vdev.num_regions].ops = ops;
 559         vgpu->vdev.region[vgpu->vdev.num_regions].size = size;
 560         vgpu->vdev.region[vgpu->vdev.num_regions].flags = flags;
 561         vgpu->vdev.region[vgpu->vdev.num_regions].data = data;
 562         vgpu->vdev.num_regions++;
 563         return 0;
 564 }
 565
 566 static int kvmgt_get_vfio_device(void *p_vgpu)
 567 {
 568         struct intel_vgpu *vgpu = (struct intel_vgpu *)p_vgpu;
 569
 570         vgpu->vdev.vfio_device = vfio_device_get_from_dev(
 571                 mdev_dev(vgpu->vdev.mdev));
 572         if (!vgpu->vdev.vfio_device) {
 573                 gvt_vgpu_err("failed to get vfio device\n");
 574                 return -ENODEV;
 575         }
 576         return 0;
 577 }
 578
 579
 580 static int kvmgt_set_opregion(void *p_vgpu)
 581 {
 582         struct intel_vgpu *vgpu = (struct intel_vgpu *)p_vgpu;
 583         void *base;
 584         int ret;
 585
 586         /* Each vgpu has its own opregion, although VFIO would create another
 587          * one later. This one is used to expose opregion to VFIO. And the
 588          * other one created by VFIO later, is used by guest actually.
 589          */
 590         base = vgpu_opregion(vgpu)->va;
 591         if (!base)
 592                 return -ENOMEM;
 593
 594         if (memcmp(base, OPREGION_SIGNATURE, 16)) {
 595                 memunmap(base);
 596                 return -EINVAL;
 597         }
 598
 599         ret = intel_vgpu_register_reg(vgpu,
 600                         PCI_VENDOR_ID_INTEL | VFIO_REGION_TYPE_PCI_VENDOR_TYPE,
 601                         VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION,
 602                         &intel_vgpu_regops_opregion, OPREGION_SIZE,
 603                         VFIO_REGION_INFO_FLAG_READ, base);
 604
 605         return ret;
 606 }
 607
 608 static int kvmgt_set_edid(void *p_vgpu, int port_num)
 609 {
 610         struct intel_vgpu *vgpu = (struct intel_vgpu *)p_vgpu;
 611         struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);
 612         struct vfio_edid_region *base;
 613         int ret;
 614
 615         base = kzalloc(sizeof(*base), GFP_KERNEL);
 616         if (!base)
 617                 return -ENOMEM;
 618
 619         /* TODO: Add multi-port and EDID extension block support */
 620         base->vfio_edid_regs.edid_offset = EDID_BLOB_OFFSET;
 621         base->vfio_edid_regs.edid_max_size = EDID_SIZE;
 622         base->vfio_edid_regs.edid_size = EDID_SIZE;
 623         base->vfio_edid_regs.max_xres = vgpu_edid_xres(port->id);
 624         base->vfio_edid_regs.max_yres = vgpu_edid_yres(port->id);
 625         base->edid_blob = port->edid->edid_block;
 626
 627         ret = intel_vgpu_register_reg(vgpu,
 628                         VFIO_REGION_TYPE_GFX,
 629                         VFIO_REGION_SUBTYPE_GFX_EDID,
 630                         &intel_vgpu_regops_edid, EDID_SIZE,
 631                         VFIO_REGION_INFO_FLAG_READ |
 632                         VFIO_REGION_INFO_FLAG_WRITE |
 633                         VFIO_REGION_INFO_FLAG_CAPS, base);
 634
 635         return ret;
 636 }
 637
 638 static void kvmgt_put_vfio_device(void *vgpu)
 639 {
 640         if (WARN_ON(!((struct intel_vgpu *)vgpu)->vdev.vfio_device))
 641                 return;
 642
 643         vfio_device_put(((struct intel_vgpu *)vgpu)->vdev.vfio_device);
 644 }
 645
 646 static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
 647 {
 648         struct intel_vgpu *vgpu = NULL;
 649         struct intel_vgpu_type *type;
 650         struct device *pdev;
 651         void *gvt;
 652         int ret;
 653
 654         pdev = mdev_parent_dev(mdev);
 655         gvt = kdev_to_i915(pdev)->gvt;
 656
 657         type = intel_gvt_ops->gvt_find_vgpu_type(gvt, kobject_name(kobj));
 658         if (!type) {
 659                 gvt_vgpu_err("failed to find type %s to create\n",
 660                                                 kobject_name(kobj));
 661                 ret = -EINVAL;
 662                 goto out;
 663         }
 664
 665         vgpu = intel_gvt_ops->vgpu_create(gvt, type);
 666         if (IS_ERR_OR_NULL(vgpu)) {
 667                 ret = vgpu == NULL ? -EFAULT : PTR_ERR(vgpu);
 668                 gvt_err("failed to create intel vgpu: %d\n", ret);
 669                 goto out;
 670         }
 671
 672         INIT_WORK(&vgpu->vdev.release_work, intel_vgpu_release_work);
 673
 674         vgpu->vdev.mdev = mdev;
 675         mdev_set_drvdata(mdev, vgpu);
 676
 677         gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
 678                      dev_name(mdev_dev(mdev)));
 679         ret = 0;
 680
 681 out:
 682         return ret;
 683 }
 684
 685 static int intel_vgpu_remove(struct mdev_device *mdev)
 686 {
 687         struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
 688
 689         if (handle_valid(vgpu->handle))
 690                 return -EBUSY;
 691
 692         intel_gvt_ops->vgpu_destroy(vgpu);
 693         return 0;
 694 }
 695
 696 static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
 697                                      unsigned long action, void *data)
 698 {
 699         struct intel_vgpu *vgpu = container_of(nb,
 700                                         struct intel_vgpu,
 701                                         vdev.iommu_notifier);
 702
 703         if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
 704                 struct vfio_iommu_type1_dma_unmap *unmap = data;
 705                 struct gvt_dma *entry;
 706                 unsigned long iov_pfn, end_iov_pfn;
 707
 708                 iov_pfn = unmap->iova >> PAGE_SHIFT;
 709                 end_iov_pfn = iov_pfn + unmap->size / PAGE_SIZE;
 710
 711                 mutex_lock(&vgpu->vdev.cache_lock);
 712                 for (; iov_pfn < end_iov_pfn; iov_pfn++) {
 713                         entry = __gvt_cache_find_gfn(vgpu, iov_pfn);
 714                         if (!entry)
 715                                 continue;
 716
 717                         gvt_dma_unmap_page(vgpu, entry->gfn, entry->dma_addr,
 718                                            entry->size);
 719                         __gvt_cache_remove_entry(vgpu, entry);
 720                 }
 721                 mutex_unlock(&vgpu->vdev.cache_lock);
 722         }
 723
 724         return NOTIFY_OK;
 725 }
 726
 727 static int intel_vgpu_group_notifier(struct notifier_block *nb,
 728                                      unsigned long action, void *data)
 729 {
 730         struct intel_vgpu *vgpu = container_of(nb,
 731                                         struct intel_vgpu,
 732                                         vdev.group_notifier);
 733
 734         /* the only action we care about */
 735         if (action == VFIO_GROUP_NOTIFY_SET_KVM) {
 736                 vgpu->vdev.kvm = data;
 737
 738                 if (!data)
 739                         schedule_work(&vgpu->vdev.release_work);
 740         }
 741
 742         return NOTIFY_OK;
 743 }
 744
 745 static int intel_vgpu_open(struct mdev_device *mdev)
 746 {
 747         struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
 748         unsigned long events;
 749         int ret;
 750
 751         vgpu->vdev.iommu_notifier.notifier_call = intel_vgpu_iommu_notifier;
 752         vgpu->vdev.group_notifier.notifier_call = intel_vgpu_group_notifier;
 753
 754         events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
 755         ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, &events,
 756                                 &vgpu->vdev.iommu_notifier);
 757         if (ret != 0) {
 758                 gvt_vgpu_err("vfio_register_notifier for iommu failed: %d\n",
 759                         ret);
 760                 goto out;
 761         }
 762
 763         events = VFIO_GROUP_NOTIFY_SET_KVM;
 764         ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &events,
 765                                 &vgpu->vdev.group_notifier);
 766         if (ret != 0) {
 767                 gvt_vgpu_err("vfio_register_notifier for group failed: %d\n",
 768                         ret);
 769                 goto undo_iommu;
 770         }
 771
 772         /* Take a module reference as mdev core doesn't take
 773          * a reference for vendor driver.
 774          */
 775         if (!try_module_get(THIS_MODULE))
 776                 goto undo_group;
 777
 778         ret = kvmgt_guest_init(mdev);
 779         if (ret)
 780                 goto undo_group;
 781
 782         intel_gvt_ops->vgpu_activate(vgpu);
 783
 784         atomic_set(&vgpu->vdev.released, 0);
 785         return ret;
 786
 787 undo_group:
 788         vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
 789                                         &vgpu->vdev.group_notifier);
 790
 791 undo_iommu:
 792         vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
 793                                         &vgpu->vdev.iommu_notifier);
 794 out:
 795         return ret;
 796 }
 797
 798 static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu)
 799 {
 800         struct eventfd_ctx *trigger;
 801
 802         trigger = vgpu->vdev.msi_trigger;
 803         if (trigger) {
 804                 eventfd_ctx_put(trigger);
 805                 vgpu->vdev.msi_trigger = NULL;
 806         }
 807 }
 808
 809 static void __intel_vgpu_release(struct intel_vgpu *vgpu)
 810 {
 811         struct kvmgt_guest_info *info;
 812         int ret;
 813
 814         if (!handle_valid(vgpu->handle))
 815                 return;
 816
 817         if (atomic_cmpxchg(&vgpu->vdev.released, 0, 1))
 818                 return;
 819
 820         intel_gvt_ops->vgpu_release(vgpu);
 821
 822         ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_IOMMU_NOTIFY,
 823                                         &vgpu->vdev.iommu_notifier);
 824         WARN(ret, "vfio_unregister_notifier for iommu failed: %d\n", ret);
 825
 826         ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_GROUP_NOTIFY,
 827                                         &vgpu->vdev.group_notifier);
 828         WARN(ret, "vfio_unregister_notifier for group failed: %d\n", ret);
 829
 830         /* dereference module reference taken at open */
 831         module_put(THIS_MODULE);
 832
 833         info = (struct kvmgt_guest_info *)vgpu->handle;
 834         kvmgt_guest_exit(info);
 835
 836         intel_vgpu_release_msi_eventfd_ctx(vgpu);
 837
 838         vgpu->vdev.kvm = NULL;
 839         vgpu->handle = 0;
 840 }
 841
 842 static void intel_vgpu_release(struct mdev_device *mdev)
 843 {
 844         struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
 845
 846         __intel_vgpu_release(vgpu);
 847 }
 848
 849 static void intel_vgpu_release_work(struct work_struct *work)
 850 {
 851         struct intel_vgpu *vgpu = container_of(work, struct intel_vgpu,
 852                                         vdev.release_work);
 853
 854         __intel_vgpu_release(vgpu);
 855 }
 856
 857 static u64 intel_vgpu_get_bar_addr(struct intel_vgpu *vgpu, int bar)
 858 {
 859         u32 start_lo, start_hi;
 860         u32 mem_type;
 861
 862         start_lo = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + bar)) &
 863                         PCI_BASE_ADDRESS_MEM_MASK;
 864         mem_type = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + bar)) &
 865                         PCI_BASE_ADDRESS_MEM_TYPE_MASK;
 866
 867         switch (mem_type) {
 868         case PCI_BASE_ADDRESS_MEM_TYPE_64:
 869                 start_hi = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space
 870                                                 + bar + 4));
 871                 break;
 872         case PCI_BASE_ADDRESS_MEM_TYPE_32:
 873         case PCI_BASE_ADDRESS_MEM_TYPE_1M:
 874                 /* 1M mem BAR treated as 32-bit BAR */
 875         default:
 876                 /* mem unknown type treated as 32-bit BAR */
 877                 start_hi = 0;
 878                 break;
 879         }
 880
 881         return ((u64)start_hi << 32) | start_lo;
 882 }
 883
 884 static int intel_vgpu_bar_rw(struct intel_vgpu *vgpu, int bar, u64 off,
 885                              void *buf, unsigned int count, bool is_write)
 886 {
 887         u64 bar_start = intel_vgpu_get_bar_addr(vgpu, bar);
 888         int ret;
 889
 890         if (is_write)
 891                 ret = intel_gvt_ops->emulate_mmio_write(vgpu,
 892                                         bar_start + off, buf, count);
 893         else
 894                 ret = intel_gvt_ops->emulate_mmio_read(vgpu,
 895                                         bar_start + off, buf, count);
 896         return ret;
 897 }
 898
 899 static inline bool intel_vgpu_in_aperture(struct intel_vgpu *vgpu, u64 off)
 900 {
 901         return off >= vgpu_aperture_offset(vgpu) &&
 902                off < vgpu_aperture_offset(vgpu) + vgpu_aperture_sz(vgpu);
 903 }
 904
 905 static int intel_vgpu_aperture_rw(struct intel_vgpu *vgpu, u64 off,
 906                 void *buf, unsigned long count, bool is_write)
 907 {
 908         void __iomem *aperture_va;
 909
 910         if (!intel_vgpu_in_aperture(vgpu, off) ||
 911             !intel_vgpu_in_aperture(vgpu, off + count)) {
 912                 gvt_vgpu_err("Invalid aperture offset %llu\n", off);
 913                 return -EINVAL;
 914         }
 915
 916         aperture_va = io_mapping_map_wc(&vgpu->gvt->dev_priv->ggtt.iomap,
 917                                         ALIGN_DOWN(off, PAGE_SIZE),
 918                                         count + offset_in_page(off));
 919         if (!aperture_va)
 920                 return -EIO;
 921
 922         if (is_write)
 923                 memcpy_toio(aperture_va + offset_in_page(off), buf, count);
 924         else
 925                 memcpy_fromio(buf, aperture_va + offset_in_page(off), count);
 926
 927         io_mapping_unmap(aperture_va);
 928
 929         return 0;
 930 }
 931
 932 static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
 933                         size_t count, loff_t *ppos, bool is_write)
 934 {
 935         struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
 936         unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
 937         u64 pos = *ppos & VFIO_PCI_OFFSET_MASK;
 938         int ret = -EINVAL;
 939
 940
 941         if (index >= VFIO_PCI_NUM_REGIONS + vgpu->vdev.num_regions) {
 942                 gvt_vgpu_err("invalid index: %u\n", index);
 943                 return -EINVAL;
 944         }
 945
 946         switch (index) {
 947         case VFIO_PCI_CONFIG_REGION_INDEX:
 948                 if (is_write)
 949                         ret = intel_gvt_ops->emulate_cfg_write(vgpu, pos,
 950                                                 buf, count);
 951                 else
 952                         ret = intel_gvt_ops->emulate_cfg_read(vgpu, pos,
 953                                                 buf, count);
 954                 break;
 955         case VFIO_PCI_BAR0_REGION_INDEX:
 956                 ret = intel_vgpu_bar_rw(vgpu, PCI_BASE_ADDRESS_0, pos,
 957                                         buf, count, is_write);
 958                 break;
 959         case VFIO_PCI_BAR2_REGION_INDEX:
 960                 ret = intel_vgpu_aperture_rw(vgpu, pos, buf, count, is_write);
 961                 break;
 962         case VFIO_PCI_BAR1_REGION_INDEX:
 963         case VFIO_PCI_BAR3_REGION_INDEX:
 964         case VFIO_PCI_BAR4_REGION_INDEX:
 965         case VFIO_PCI_BAR5_REGION_INDEX:
 966         case VFIO_PCI_VGA_REGION_INDEX:
 967         case VFIO_PCI_ROM_REGION_INDEX:
 968                 break;
 969         default:
 970                 if (index >= VFIO_PCI_NUM_REGIONS + vgpu->vdev.num_regions)
 971                         return -EINVAL;
 972
 973                 index -= VFIO_PCI_NUM_REGIONS;
 974                 return vgpu->vdev.region[index].ops->rw(vgpu, buf, count,
 975                                 ppos, is_write);
 976         }
 977
 978         return ret == 0 ? count : ret;
 979 }
 980
 981 static bool gtt_entry(struct mdev_device *mdev, loff_t *ppos)
 982 {
 983         struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
 984         unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
 985         struct intel_gvt *gvt = vgpu->gvt;
 986         int offset;
 987
 988         /* Only allow MMIO GGTT entry access */
 989         if (index != PCI_BASE_ADDRESS_0)
 990                 return false;
 991
 992         offset = (u64)(*ppos & VFIO_PCI_OFFSET_MASK) -
 993                 intel_vgpu_get_bar_gpa(vgpu, PCI_BASE_ADDRESS_0);
 994
 995         return (offset >= gvt->device_info.gtt_start_offset &&
 996                 offset < gvt->device_info.gtt_start_offset + gvt_ggtt_sz(gvt)) ?
 997                         true : false;
 998 }
 999
1000 static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
1001                         size_t count, loff_t *ppos)
1002 {
1003         unsigned int done = 0;
1004         int ret;
1005
1006         while (count) {
1007                 size_t filled;
1008
1009                 /* Only support GGTT entry 8 bytes read */
1010                 if (count >= 8 && !(*ppos % 8) &&
1011                         gtt_entry(mdev, ppos)) {
1012                         u64 val;
1013
1014                         ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
1015                                         ppos, false);
1016                         if (ret <= 0)
1017                                 goto read_err;
1018
1019                         if (copy_to_user(buf, &val, sizeof(val)))
1020                                 goto read_err;
1021
1022                         filled = 8;
1023                 } else if (count >= 4 && !(*ppos % 4)) {
1024                         u32 val;
1025
1026                         ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
1027                                         ppos, false);
1028                         if (ret <= 0)
1029                                 goto read_err;
1030
1031                         if (copy_to_user(buf, &val, sizeof(val)))
1032                                 goto read_err;
1033
1034                         filled = 4;
1035                 } else if (count >= 2 && !(*ppos % 2)) {
1036                         u16 val;
1037
1038                         ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
1039                                         ppos, false);
1040                         if (ret <= 0)
1041                                 goto read_err;
1042
1043                         if (copy_to_user(buf, &val, sizeof(val)))
1044                                 goto read_err;
1045
1046                         filled = 2;
1047                 } else {
1048                         u8 val;
1049
1050                         ret = intel_vgpu_rw(mdev, &val, sizeof(val), ppos,
1051                                         false);
1052                         if (ret <= 0)
1053                                 goto read_err;
1054
1055                         if (copy_to_user(buf, &val, sizeof(val)))
1056                                 goto read_err;
1057
1058                         filled = 1;
1059                 }
1060
1061                 count -= filled;
1062                 done += filled;
1063                 *ppos += filled;
1064                 buf += filled;
1065         }
1066
1067         return done;
1068
1069 read_err:
1070         return -EFAULT;
1071 }
1072
1073 static ssize_t intel_vgpu_write(struct mdev_device *mdev,
1074                                 const char __user *buf,
1075                                 size_t count, loff_t *ppos)
1076 {
1077         unsigned int done = 0;
1078         int ret;
1079
1080         while (count) {
1081                 size_t filled;
1082
1083                 /* Only support GGTT entry 8 bytes write */
1084                 if (count >= 8 && !(*ppos % 8) &&
1085                         gtt_entry(mdev, ppos)) {
1086                         u64 val;
1087
1088                         if (copy_from_user(&val, buf, sizeof(val)))
1089                                 goto write_err;
1090
1091                         ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
1092                                         ppos, true);
1093                         if (ret <= 0)
1094                                 goto write_err;
1095
1096                         filled = 8;
1097                 } else if (count >= 4 && !(*ppos % 4)) {
1098                         u32 val;
1099
1100                         if (copy_from_user(&val, buf, sizeof(val)))
1101                                 goto write_err;
1102
1103                         ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
1104                                         ppos, true);
1105                         if (ret <= 0)
1106                                 goto write_err;
1107
1108                         filled = 4;
1109                 } else if (count >= 2 && !(*ppos % 2)) {
1110                         u16 val;
1111
1112                         if (copy_from_user(&val, buf, sizeof(val)))
1113                                 goto write_err;
1114
1115                         ret = intel_vgpu_rw(mdev, (char *)&val,
1116                                         sizeof(val), ppos, true);
1117                         if (ret <= 0)
1118                                 goto write_err;
1119
1120                         filled = 2;
1121                 } else {
1122                         u8 val;
1123
1124                         if (copy_from_user(&val, buf, sizeof(val)))
1125                                 goto write_err;
1126
1127                         ret = intel_vgpu_rw(mdev, &val, sizeof(val),
1128                                         ppos, true);
1129                         if (ret <= 0)
1130                                 goto write_err;
1131
1132                         filled = 1;
1133                 }
1134
1135                 count -= filled;
1136                 done += filled;
1137                 *ppos += filled;
1138                 buf += filled;
1139         }
1140
1141         return done;
1142 write_err:
1143         return -EFAULT;
1144 }
1145
1146 static int intel_vgpu_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
1147 {
1148         unsigned int index;
1149         u64 virtaddr;
1150         unsigned long req_size, pgoff, req_start;
1151         pgprot_t pg_prot;
1152         struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
1153
1154         index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
1155         if (index >= VFIO_PCI_ROM_REGION_INDEX)
1156                 return -EINVAL;
1157
1158         if (vma->vm_end < vma->vm_start)
1159                 return -EINVAL;
1160         if ((vma->vm_flags & VM_SHARED) == 0)
1161                 return -EINVAL;
1162         if (index != VFIO_PCI_BAR2_REGION_INDEX)
1163                 return -EINVAL;
1164
1165         pg_prot = vma->vm_page_prot;
1166         virtaddr = vma->vm_start;
1167         req_size = vma->vm_end - vma->vm_start;
1168         pgoff = vma->vm_pgoff &
1169                 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
1170         req_start = pgoff << PAGE_SHIFT;
1171
1172         if (!intel_vgpu_in_aperture(vgpu, req_start))
1173                 return -EINVAL;
1174         if (req_start + req_size >
1175             vgpu_aperture_offset(vgpu) + vgpu_aperture_sz(vgpu))
1176                 return -EINVAL;
1177
1178         pgoff = (gvt_aperture_pa_base(vgpu->gvt) >> PAGE_SHIFT) + pgoff;
1179
1180         return remap_pfn_range(vma, virtaddr, pgoff, req_size, pg_prot);
1181 }
1182
1183 static int intel_vgpu_get_irq_count(struct intel_vgpu *vgpu, int type)
1184 {
1185         if (type == VFIO_PCI_INTX_IRQ_INDEX || type == VFIO_PCI_MSI_IRQ_INDEX)
1186                 return 1;
1187
1188         return 0;
1189 }
1190
1191 static int intel_vgpu_set_intx_mask(struct intel_vgpu *vgpu,
1192                         unsigned int index, unsigned int start,
1193                         unsigned int count, u32 flags,
1194                         void *data)
1195 {
1196         return 0;
1197 }
1198
1199 static int intel_vgpu_set_intx_unmask(struct intel_vgpu *vgpu,
1200                         unsigned int index, unsigned int start,
1201                         unsigned int count, u32 flags, void *data)
1202 {
1203         return 0;
1204 }
1205
1206 static int intel_vgpu_set_intx_trigger(struct intel_vgpu *vgpu,
1207                 unsigned int index, unsigned int start, unsigned int count,
1208                 u32 flags, void *data)
1209 {
1210         return 0;
1211 }
1212
1213 static int intel_vgpu_set_msi_trigger(struct intel_vgpu *vgpu,
1214                 unsigned int index, unsigned int start, unsigned int count,
1215                 u32 flags, void *data)
1216 {
1217         struct eventfd_ctx *trigger;
1218
1219         if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
1220                 int fd = *(int *)data;
1221
1222                 trigger = eventfd_ctx_fdget(fd);
1223                 if (IS_ERR(trigger)) {
1224                         gvt_vgpu_err("eventfd_ctx_fdget failed\n");
1225                         return PTR_ERR(trigger);
1226                 }
1227                 vgpu->vdev.msi_trigger = trigger;
1228         } else if ((flags & VFIO_IRQ_SET_DATA_NONE) && !count)
1229                 intel_vgpu_release_msi_eventfd_ctx(vgpu);
1230
1231         return 0;
1232 }
1233
1234 static int intel_vgpu_set_irqs(struct intel_vgpu *vgpu, u32 flags,
1235                 unsigned int index, unsigned int start, unsigned int count,
1236                 void *data)
1237 {
1238         int (*func)(struct intel_vgpu *vgpu, unsigned int index,
1239                         unsigned int start, unsigned int count, u32 flags,
1240                         void *data) = NULL;
1241
1242         switch (index) {
1243         case VFIO_PCI_INTX_IRQ_INDEX:
1244                 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
1245                 case VFIO_IRQ_SET_ACTION_MASK:
1246                         func = intel_vgpu_set_intx_mask;
1247                         break;
1248                 case VFIO_IRQ_SET_ACTION_UNMASK:
1249                         func = intel_vgpu_set_intx_unmask;
1250                         break;
1251                 case VFIO_IRQ_SET_ACTION_TRIGGER:
1252                         func = intel_vgpu_set_intx_trigger;
1253                         break;
1254                 }
1255                 break;
1256         case VFIO_PCI_MSI_IRQ_INDEX:
1257                 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
1258                 case VFIO_IRQ_SET_ACTION_MASK:
1259                 case VFIO_IRQ_SET_ACTION_UNMASK:
1260                         /* XXX Need masking support exported */
1261                         break;
1262                 case VFIO_IRQ_SET_ACTION_TRIGGER:
1263                         func = intel_vgpu_set_msi_trigger;
1264                         break;
1265                 }
1266                 break;
1267         }
1268
1269         if (!func)
1270                 return -ENOTTY;
1271
1272         return func(vgpu, index, start, count, flags, data);
1273 }
1274
1275 static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
1276                              unsigned long arg)
1277 {
1278         struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
1279         unsigned long minsz;
1280
1281         gvt_dbg_core("vgpu%d ioctl, cmd: %d\n", vgpu->id, cmd);
1282
1283         if (cmd == VFIO_DEVICE_GET_INFO) {
1284                 struct vfio_device_info info;
1285
1286                 minsz = offsetofend(struct vfio_device_info, num_irqs);
1287
1288                 if (copy_from_user(&info, (void __user *)arg, minsz))
1289                         return -EFAULT;
1290
1291                 if (info.argsz < minsz)
1292                         return -EINVAL;
1293
1294                 info.flags = VFIO_DEVICE_FLAGS_PCI;
1295                 info.flags |= VFIO_DEVICE_FLAGS_RESET;
1296                 info.num_regions = VFIO_PCI_NUM_REGIONS +
1297                                 vgpu->vdev.num_regions;
1298                 info.num_irqs = VFIO_PCI_NUM_IRQS;
1299
1300                 return copy_to_user((void __user *)arg, &info, minsz) ?
1301                         -EFAULT : 0;
1302
1303         } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
1304                 struct vfio_region_info info;
1305                 struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
1306                 unsigned int i;
1307                 int ret;
1308                 struct vfio_region_info_cap_sparse_mmap *sparse = NULL;
1309                 size_t size;
1310                 int nr_areas = 1;
1311                 int cap_type_id;
1312
1313                 minsz = offsetofend(struct vfio_region_info, offset);
1314
1315                 if (copy_from_user(&info, (void __user *)arg, minsz))
1316                         return -EFAULT;
1317
1318                 if (info.argsz < minsz)
1319                         return -EINVAL;
1320
1321                 switch (info.index) {
1322                 case VFIO_PCI_CONFIG_REGION_INDEX:
1323                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1324                         info.size = vgpu->gvt->device_info.cfg_space_size;
1325                         info.flags = VFIO_REGION_INFO_FLAG_READ |
1326                                      VFIO_REGION_INFO_FLAG_WRITE;
1327                         break;
1328                 case VFIO_PCI_BAR0_REGION_INDEX:
1329                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1330                         info.size = vgpu->cfg_space.bar[info.index].size;
1331                         if (!info.size) {
1332                                 info.flags = 0;
1333                                 break;
1334                         }
1335
1336                         info.flags = VFIO_REGION_INFO_FLAG_READ |
1337                                      VFIO_REGION_INFO_FLAG_WRITE;
1338                         break;
1339                 case VFIO_PCI_BAR1_REGION_INDEX:
1340                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1341                         info.size = 0;
1342                         info.flags = 0;
1343                         break;
1344                 case VFIO_PCI_BAR2_REGION_INDEX:
1345                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1346                         info.flags = VFIO_REGION_INFO_FLAG_CAPS |
1347                                         VFIO_REGION_INFO_FLAG_MMAP |
1348                                         VFIO_REGION_INFO_FLAG_READ |
1349                                         VFIO_REGION_INFO_FLAG_WRITE;
1350                         info.size = gvt_aperture_sz(vgpu->gvt);
1351
1352                         size = sizeof(*sparse) +
1353                                         (nr_areas * sizeof(*sparse->areas));
1354                         sparse = kzalloc(size, GFP_KERNEL);
1355                         if (!sparse)
1356                                 return -ENOMEM;
1357
1358                         sparse->header.id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
1359                         sparse->header.version = 1;
1360                         sparse->nr_areas = nr_areas;
1361                         cap_type_id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
1362                         sparse->areas[0].offset =
1363                                         PAGE_ALIGN(vgpu_aperture_offset(vgpu));
1364                         sparse->areas[0].size = vgpu_aperture_sz(vgpu);
1365                         break;
1366
1367                 case VFIO_PCI_BAR3_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
1368                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1369                         info.size = 0;
1370                         info.flags = 0;
1371
1372                         gvt_dbg_core("get region info bar:%d\n", info.index);
1373                         break;
1374
1375                 case VFIO_PCI_ROM_REGION_INDEX:
1376                 case VFIO_PCI_VGA_REGION_INDEX:
1377                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1378                         info.size = 0;
1379                         info.flags = 0;
1380
1381                         gvt_dbg_core("get region info index:%d\n", info.index);
1382                         break;
1383                 default:
1384                         {
1385                                 struct vfio_region_info_cap_type cap_type = {
1386                                         .header.id = VFIO_REGION_INFO_CAP_TYPE,
1387                                         .header.version = 1 };
1388
1389                                 if (info.index >= VFIO_PCI_NUM_REGIONS +
1390                                                 vgpu->vdev.num_regions)
1391                                         return -EINVAL;
1392                                 info.index =
1393                                         array_index_nospec(info.index,
1394                                                         VFIO_PCI_NUM_REGIONS +
1395                                                         vgpu->vdev.num_regions);
1396
1397                                 i = info.index - VFIO_PCI_NUM_REGIONS;
1398
1399                                 info.offset =
1400                                         VFIO_PCI_INDEX_TO_OFFSET(info.index);
1401                                 info.size = vgpu->vdev.region[i].size;
1402                                 info.flags = vgpu->vdev.region[i].flags;
1403
1404                                 cap_type.type = vgpu->vdev.region[i].type;
1405                                 cap_type.subtype = vgpu->vdev.region[i].subtype;
1406
1407                                 ret = vfio_info_add_capability(&caps,
1408                                                         &cap_type.header,
1409                                                         sizeof(cap_type));
1410                                 if (ret)
1411                                         return ret;
1412                         }
1413                 }
1414
1415                 if ((info.flags & VFIO_REGION_INFO_FLAG_CAPS) && sparse) {
1416                         switch (cap_type_id) {
1417                         case VFIO_REGION_INFO_CAP_SPARSE_MMAP:
1418                                 ret = vfio_info_add_capability(&caps,
1419                                         &sparse->header, sizeof(*sparse) +
1420                                         (sparse->nr_areas *
1421                                                 sizeof(*sparse->areas)));
1422                                 if (ret) {
1423                                         kfree(sparse);
1424                                         return ret;
1425                                 }
1426                                 break;
1427                         default:
1428                                 kfree(sparse);
1429                                 return -EINVAL;
1430                         }
1431                 }
1432
1433                 if (caps.size) {
1434                         info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
1435                         if (info.argsz < sizeof(info) + caps.size) {
1436                                 info.argsz = sizeof(info) + caps.size;
1437                                 info.cap_offset = 0;
1438                         } else {
1439                                 vfio_info_cap_shift(&caps, sizeof(info));
1440                                 if (copy_to_user((void __user *)arg +
1441                                                   sizeof(info), caps.buf,
1442                                                   caps.size)) {
1443                                         kfree(caps.buf);
1444                                         kfree(sparse);
1445                                         return -EFAULT;
1446                                 }
1447                                 info.cap_offset = sizeof(info);
1448                         }
1449
1450                         kfree(caps.buf);
1451                 }
1452
1453                 kfree(sparse);
1454                 return copy_to_user((void __user *)arg, &info, minsz) ?
1455                         -EFAULT : 0;
1456         } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
1457                 struct vfio_irq_info info;
1458
1459                 minsz = offsetofend(struct vfio_irq_info, count);
1460
1461                 if (copy_from_user(&info, (void __user *)arg, minsz))
1462                         return -EFAULT;
1463
1464                 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
1465                         return -EINVAL;
1466
1467                 switch (info.index) {
1468                 case VFIO_PCI_INTX_IRQ_INDEX:
1469                 case VFIO_PCI_MSI_IRQ_INDEX:
1470                         break;
1471                 default:
1472                         return -EINVAL;
1473                 }
1474
1475                 info.flags = VFIO_IRQ_INFO_EVENTFD;
1476
1477                 info.count = intel_vgpu_get_irq_count(vgpu, info.index);
1478
1479                 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
1480                         info.flags |= (VFIO_IRQ_INFO_MASKABLE |
1481                                        VFIO_IRQ_INFO_AUTOMASKED);
1482                 else
1483                         info.flags |= VFIO_IRQ_INFO_NORESIZE;
1484
1485                 return copy_to_user((void __user *)arg, &info, minsz) ?
1486                         -EFAULT : 0;
1487         } else if (cmd == VFIO_DEVICE_SET_IRQS) {
1488                 struct vfio_irq_set hdr;
1489                 u8 *data = NULL;
1490                 int ret = 0;
1491                 size_t data_size = 0;
1492
1493                 minsz = offsetofend(struct vfio_irq_set, count);
1494
1495                 if (copy_from_user(&hdr, (void __user *)arg, minsz))
1496                         return -EFAULT;
1497
1498                 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
1499                         int max = intel_vgpu_get_irq_count(vgpu, hdr.index);
1500
1501                         ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
1502                                                 VFIO_PCI_NUM_IRQS, &data_size);
1503                         if (ret) {
1504                                 gvt_vgpu_err("intel:vfio_set_irqs_validate_and_prepare failed\n");
1505                                 return -EINVAL;
1506                         }
1507                         if (data_size) {
1508                                 data = memdup_user((void __user *)(arg + minsz),
1509                                                    data_size);
1510                                 if (IS_ERR(data))
1511                                         return PTR_ERR(data);
1512                         }
1513                 }
1514
1515                 ret = intel_vgpu_set_irqs(vgpu, hdr.flags, hdr.index,
1516                                         hdr.start, hdr.count, data);
1517                 kfree(data);
1518
1519                 return ret;
1520         } else if (cmd == VFIO_DEVICE_RESET) {
1521                 intel_gvt_ops->vgpu_reset(vgpu);
1522                 return 0;
1523         } else if (cmd == VFIO_DEVICE_QUERY_GFX_PLANE) {
1524                 struct vfio_device_gfx_plane_info dmabuf;
1525                 int ret = 0;
1526
1527                 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1528                                     dmabuf_id);
1529                 if (copy_from_user(&dmabuf, (void __user *)arg, minsz))
1530                         return -EFAULT;
1531                 if (dmabuf.argsz < minsz)
1532                         return -EINVAL;
1533
1534                 ret = intel_gvt_ops->vgpu_query_plane(vgpu, &dmabuf);
1535                 if (ret != 0)
1536                         return ret;
1537
1538                 return copy_to_user((void __user *)arg, &dmabuf, minsz) ?
1539                                                                 -EFAULT : 0;
1540         } else if (cmd == VFIO_DEVICE_GET_GFX_DMABUF) {
1541                 __u32 dmabuf_id;
1542                 __s32 dmabuf_fd;
1543
1544                 if (get_user(dmabuf_id, (__u32 __user *)arg))
1545                         return -EFAULT;
1546
1547                 dmabuf_fd = intel_gvt_ops->vgpu_get_dmabuf(vgpu, dmabuf_id);
1548                 return dmabuf_fd;
1549
1550         }
1551
1552         return -ENOTTY;
1553 }
1554
1555 static ssize_t
1556 vgpu_id_show(struct device *dev, struct device_attribute *attr,
1557              char *buf)
1558 {
1559         struct mdev_device *mdev = mdev_from_dev(dev);
1560
1561         if (mdev) {
1562                 struct intel_vgpu *vgpu = (struct intel_vgpu *)
1563                         mdev_get_drvdata(mdev);
1564                 return sprintf(buf, "%d\n", vgpu->id);
1565         }
1566         return sprintf(buf, "\n");
1567 }
1568
1569 static ssize_t
1570 hw_id_show(struct device *dev, struct device_attribute *attr,
1571            char *buf)
1572 {
1573         struct mdev_device *mdev = mdev_from_dev(dev);
1574
1575         if (mdev) {
1576                 struct intel_vgpu *vgpu = (struct intel_vgpu *)
1577                         mdev_get_drvdata(mdev);
1578                 return sprintf(buf, "%u\n",
1579                                vgpu->submission.shadow_ctx->hw_id);
1580         }
1581         return sprintf(buf, "\n");
1582 }
1583
1584 static DEVICE_ATTR_RO(vgpu_id);
1585 static DEVICE_ATTR_RO(hw_id);
1586
1587 static struct attribute *intel_vgpu_attrs[] = {
1588         &dev_attr_vgpu_id.attr,
1589         &dev_attr_hw_id.attr,
1590         NULL
1591 };
1592
1593 static const struct attribute_group intel_vgpu_group = {
1594         .name = "intel_vgpu",
1595         .attrs = intel_vgpu_attrs,
1596 };
1597
1598 static const struct attribute_group *intel_vgpu_groups[] = {
1599         &intel_vgpu_group,
1600         NULL,
1601 };
1602
1603 static struct mdev_parent_ops intel_vgpu_ops = {
1604         .mdev_attr_groups       = intel_vgpu_groups,
1605         .create                 = intel_vgpu_create,
1606         .remove                 = intel_vgpu_remove,
1607
1608         .open                   = intel_vgpu_open,
1609         .release                = intel_vgpu_release,
1610
1611         .read                   = intel_vgpu_read,
1612         .write                  = intel_vgpu_write,
1613         .mmap                   = intel_vgpu_mmap,
1614         .ioctl                  = intel_vgpu_ioctl,
1615 };
1616
1617 static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
1618 {
1619         struct attribute **kvm_type_attrs;
1620         struct attribute_group **kvm_vgpu_type_groups;
1621
1622         intel_gvt_ops = ops;
1623         if (!intel_gvt_ops->get_gvt_attrs(&kvm_type_attrs,
1624                         &kvm_vgpu_type_groups))
1625                 return -EFAULT;
1626         intel_vgpu_ops.supported_type_groups = kvm_vgpu_type_groups;
1627
1628         return mdev_register_device(dev, &intel_vgpu_ops);
1629 }
1630
1631 static void kvmgt_host_exit(struct device *dev)
1632 {
1633         mdev_unregister_device(dev);
1634 }
1635
1636 static int kvmgt_page_track_add(unsigned long handle, u64 gfn)
1637 {
1638         struct kvmgt_guest_info *info;
1639         struct kvm *kvm;
1640         struct kvm_memory_slot *slot;
1641         int idx;
1642
1643         if (!handle_valid(handle))
1644                 return -ESRCH;
1645
1646         info = (struct kvmgt_guest_info *)handle;
1647         kvm = info->kvm;
1648
1649         idx = srcu_read_lock(&kvm->srcu);
1650         slot = gfn_to_memslot(kvm, gfn);
1651         if (!slot) {
1652                 srcu_read_unlock(&kvm->srcu, idx);
1653                 return -EINVAL;
1654         }
1655
1656         spin_lock(&kvm->mmu_lock);
1657
1658         if (kvmgt_gfn_is_write_protected(info, gfn))
1659                 goto out;
1660
1661         kvm_slot_page_track_add_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
1662         kvmgt_protect_table_add(info, gfn);
1663
1664 out:
1665         spin_unlock(&kvm->mmu_lock);
1666         srcu_read_unlock(&kvm->srcu, idx);
1667         return 0;
1668 }
1669
1670 static int kvmgt_page_track_remove(unsigned long handle, u64 gfn)
1671 {
1672         struct kvmgt_guest_info *info;
1673         struct kvm *kvm;
1674         struct kvm_memory_slot *slot;
1675         int idx;
1676
1677         if (!handle_valid(handle))
1678                 return 0;
1679
1680         info = (struct kvmgt_guest_info *)handle;
1681         kvm = info->kvm;
1682
1683         idx = srcu_read_lock(&kvm->srcu);
1684         slot = gfn_to_memslot(kvm, gfn);
1685         if (!slot) {
1686                 srcu_read_unlock(&kvm->srcu, idx);
1687                 return -EINVAL;
1688         }
1689
1690         spin_lock(&kvm->mmu_lock);
1691
1692         if (!kvmgt_gfn_is_write_protected(info, gfn))
1693                 goto out;
1694
1695         kvm_slot_page_track_remove_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
1696         kvmgt_protect_table_del(info, gfn);
1697
1698 out:
1699         spin_unlock(&kvm->mmu_lock);
1700         srcu_read_unlock(&kvm->srcu, idx);
1701         return 0;
1702 }
1703
1704 static void kvmgt_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa,
1705                 const u8 *val, int len,
1706                 struct kvm_page_track_notifier_node *node)
1707 {
1708         struct kvmgt_guest_info *info = container_of(node,
1709                                         struct kvmgt_guest_info, track_node);
1710
1711         if (kvmgt_gfn_is_write_protected(info, gpa_to_gfn(gpa)))
1712                 intel_gvt_ops->write_protect_handler(info->vgpu, gpa,
1713                                                      (void *)val, len);
1714 }
1715
1716 static void kvmgt_page_track_flush_slot(struct kvm *kvm,
1717                 struct kvm_memory_slot *slot,
1718                 struct kvm_page_track_notifier_node *node)
1719 {
1720         int i;
1721         gfn_t gfn;
1722         struct kvmgt_guest_info *info = container_of(node,
1723                                         struct kvmgt_guest_info, track_node);
1724
1725         spin_lock(&kvm->mmu_lock);
1726         for (i = 0; i < slot->npages; i++) {
1727                 gfn = slot->base_gfn + i;
1728                 if (kvmgt_gfn_is_write_protected(info, gfn)) {
1729                         kvm_slot_page_track_remove_page(kvm, slot, gfn,
1730                                                 KVM_PAGE_TRACK_WRITE);
1731                         kvmgt_protect_table_del(info, gfn);
1732                 }
1733         }
1734         spin_unlock(&kvm->mmu_lock);
1735 }
1736
1737 static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
1738 {
1739         struct intel_vgpu *itr;
1740         struct kvmgt_guest_info *info;
1741         int id;
1742         bool ret = false;
1743
1744         mutex_lock(&vgpu->gvt->lock);
1745         for_each_active_vgpu(vgpu->gvt, itr, id) {
1746                 if (!handle_valid(itr->handle))
1747                         continue;
1748
1749                 info = (struct kvmgt_guest_info *)itr->handle;
1750                 if (kvm && kvm == info->kvm) {
1751                         ret = true;
1752                         goto out;
1753                 }
1754         }
1755 out:
1756         mutex_unlock(&vgpu->gvt->lock);
1757         return ret;
1758 }
1759
1760 static int kvmgt_guest_init(struct mdev_device *mdev)
1761 {
1762         struct kvmgt_guest_info *info;
1763         struct intel_vgpu *vgpu;
1764         struct kvm *kvm;
1765
1766         vgpu = mdev_get_drvdata(mdev);
1767         if (handle_valid(vgpu->handle))
1768                 return -EEXIST;
1769
1770         kvm = vgpu->vdev.kvm;
1771         if (!kvm || kvm->mm != current->mm) {
1772                 gvt_vgpu_err("KVM is required to use Intel vGPU\n");
1773                 return -ESRCH;
1774         }
1775
1776         if (__kvmgt_vgpu_exist(vgpu, kvm))
1777                 return -EEXIST;
1778
1779         info = vzalloc(sizeof(struct kvmgt_guest_info));
1780         if (!info)
1781                 return -ENOMEM;
1782
1783         vgpu->handle = (unsigned long)info;
1784         info->vgpu = vgpu;
1785         info->kvm = kvm;
1786         kvm_get_kvm(info->kvm);
1787
1788         kvmgt_protect_table_init(info);
1789         gvt_cache_init(vgpu);
1790
1791         init_completion(&vgpu->vblank_done);
1792
1793         info->track_node.track_write = kvmgt_page_track_write;
1794         info->track_node.track_flush_slot = kvmgt_page_track_flush_slot;
1795         kvm_page_track_register_notifier(kvm, &info->track_node);
1796
1797         info->debugfs_cache_entries = debugfs_create_ulong(
1798                                                 "kvmgt_nr_cache_entries",
1799                                                 0444, vgpu->debugfs,
1800                                                 &vgpu->vdev.nr_cache_entries);
1801         if (!info->debugfs_cache_entries)
1802                 gvt_vgpu_err("Cannot create kvmgt debugfs entry\n");
1803
1804         return 0;
1805 }
1806
1807 static bool kvmgt_guest_exit(struct kvmgt_guest_info *info)
1808 {
1809         debugfs_remove(info->debugfs_cache_entries);
1810
1811         kvm_page_track_unregister_notifier(info->kvm, &info->track_node);
1812         kvm_put_kvm(info->kvm);
1813         kvmgt_protect_table_destroy(info);
1814         gvt_cache_destroy(info->vgpu);
1815         vfree(info);
1816
1817         return true;
1818 }
1819
1820 static int kvmgt_attach_vgpu(void *vgpu, unsigned long *handle)
1821 {
1822         /* nothing to do here */
1823         return 0;
1824 }
1825
1826 static void kvmgt_detach_vgpu(void *p_vgpu)
1827 {
1828         int i;
1829         struct intel_vgpu *vgpu = (struct intel_vgpu *)p_vgpu;
1830
1831         if (!vgpu->vdev.region)
1832                 return;
1833
1834         for (i = 0; i < vgpu->vdev.num_regions; i++)
1835                 if (vgpu->vdev.region[i].ops->release)
1836                         vgpu->vdev.region[i].ops->release(vgpu,
1837                                         &vgpu->vdev.region[i]);
1838         vgpu->vdev.num_regions = 0;
1839         kfree(vgpu->vdev.region);
1840         vgpu->vdev.region = NULL;
1841 }
1842
1843 static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data)
1844 {
1845         struct kvmgt_guest_info *info;
1846         struct intel_vgpu *vgpu;
1847
1848         if (!handle_valid(handle))
1849                 return -ESRCH;
1850
1851         info = (struct kvmgt_guest_info *)handle;
1852         vgpu = info->vgpu;
1853
1854         /*
1855          * When guest is poweroff, msi_trigger is set to NULL, but vgpu's
1856          * config and mmio register isn't restored to default during guest
1857          * poweroff. If this vgpu is still used in next vm, this vgpu's pipe
1858          * may be enabled, then once this vgpu is active, it will get inject
1859          * vblank interrupt request. But msi_trigger is null until msi is
1860          * enabled by guest. so if msi_trigger is null, success is still
1861          * returned and don't inject interrupt into guest.
1862          */
1863         if (vgpu->vdev.msi_trigger == NULL)
1864                 return 0;
1865
1866         if (eventfd_signal(vgpu->vdev.msi_trigger, 1) == 1)
1867                 return 0;
1868
1869         return -EFAULT;
1870 }
1871
1872 static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
1873 {
1874         struct kvmgt_guest_info *info;
1875         kvm_pfn_t pfn;
1876
1877         if (!handle_valid(handle))
1878                 return INTEL_GVT_INVALID_ADDR;
1879
1880         info = (struct kvmgt_guest_info *)handle;
1881
1882         pfn = gfn_to_pfn(info->kvm, gfn);
1883         if (is_error_noslot_pfn(pfn))
1884                 return INTEL_GVT_INVALID_ADDR;
1885
1886         return pfn;
1887 }
1888
1889 static int kvmgt_dma_map_guest_page(unsigned long handle, unsigned long gfn,
1890                 unsigned long size, dma_addr_t *dma_addr)
1891 {
1892         struct kvmgt_guest_info *info;
1893         struct intel_vgpu *vgpu;
1894         struct gvt_dma *entry;
1895         int ret;
1896
1897         if (!handle_valid(handle))
1898                 return -EINVAL;
1899
1900         info = (struct kvmgt_guest_info *)handle;
1901         vgpu = info->vgpu;
1902
1903         mutex_lock(&info->vgpu->vdev.cache_lock);
1904
1905         entry = __gvt_cache_find_gfn(info->vgpu, gfn);
1906         if (!entry) {
1907                 ret = gvt_dma_map_page(vgpu, gfn, dma_addr, size);
1908                 if (ret)
1909                         goto err_unlock;
1910
1911                 ret = __gvt_cache_add(info->vgpu, gfn, *dma_addr, size);
1912                 if (ret)
1913                         goto err_unmap;
1914         } else {
1915                 kref_get(&entry->ref);
1916                 *dma_addr = entry->dma_addr;
1917         }
1918
1919         mutex_unlock(&info->vgpu->vdev.cache_lock);
1920         return 0;
1921
1922 err_unmap:
1923         gvt_dma_unmap_page(vgpu, gfn, *dma_addr, size);
1924 err_unlock:
1925         mutex_unlock(&info->vgpu->vdev.cache_lock);
1926         return ret;
1927 }
1928
1929 static void __gvt_dma_release(struct kref *ref)
1930 {
1931         struct gvt_dma *entry = container_of(ref, typeof(*entry), ref);
1932
1933         gvt_dma_unmap_page(entry->vgpu, entry->gfn, entry->dma_addr,
1934                            entry->size);
1935         __gvt_cache_remove_entry(entry->vgpu, entry);
1936 }
1937
1938 static void kvmgt_dma_unmap_guest_page(unsigned long handle, dma_addr_t dma_addr)
1939 {
1940         struct kvmgt_guest_info *info;
1941         struct gvt_dma *entry;
1942
1943         if (!handle_valid(handle))
1944                 return;
1945
1946         info = (struct kvmgt_guest_info *)handle;
1947
1948         mutex_lock(&info->vgpu->vdev.cache_lock);
1949         entry = __gvt_cache_find_dma_addr(info->vgpu, dma_addr);
1950         if (entry)
1951                 kref_put(&entry->ref, __gvt_dma_release);
1952         mutex_unlock(&info->vgpu->vdev.cache_lock);
1953 }
1954
1955 static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa,
1956                         void *buf, unsigned long len, bool write)
1957 {
1958         struct kvmgt_guest_info *info;
1959         struct kvm *kvm;
1960         int idx, ret;
1961         bool kthread = current->mm == NULL;
1962
1963         if (!handle_valid(handle))
1964                 return -ESRCH;
1965
1966         info = (struct kvmgt_guest_info *)handle;
1967         kvm = info->kvm;
1968
1969         if (kthread) {
1970                 if (!mmget_not_zero(kvm->mm))
1971                         return -EFAULT;
1972                 use_mm(kvm->mm);
1973         }
1974
1975         idx = srcu_read_lock(&kvm->srcu);
1976         ret = write ? kvm_write_guest(kvm, gpa, buf, len) :
1977                       kvm_read_guest(kvm, gpa, buf, len);
1978         srcu_read_unlock(&kvm->srcu, idx);
1979
1980         if (kthread) {
1981                 unuse_mm(kvm->mm);
1982                 mmput(kvm->mm);
1983         }
1984
1985         return ret;
1986 }
1987
1988 static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa,
1989                         void *buf, unsigned long len)
1990 {
1991         return kvmgt_rw_gpa(handle, gpa, buf, len, false);
1992 }
1993
1994 static int kvmgt_write_gpa(unsigned long handle, unsigned long gpa,
1995                         void *buf, unsigned long len)
1996 {
1997         return kvmgt_rw_gpa(handle, gpa, buf, len, true);
1998 }
1999
2000 static unsigned long kvmgt_virt_to_pfn(void *addr)
2001 {
2002         return PFN_DOWN(__pa(addr));
2003 }
2004
2005 static bool kvmgt_is_valid_gfn(unsigned long handle, unsigned long gfn)
2006 {
2007         struct kvmgt_guest_info *info;
2008         struct kvm *kvm;
2009         int idx;
2010         bool ret;
2011
2012         if (!handle_valid(handle))
2013                 return false;
2014
2015         info = (struct kvmgt_guest_info *)handle;
2016         kvm = info->kvm;
2017
2018         idx = srcu_read_lock(&kvm->srcu);
2019         ret = kvm_is_visible_gfn(kvm, gfn);
2020         srcu_read_unlock(&kvm->srcu, idx);
2021
2022         return ret;
2023 }
2024
2025 static struct intel_gvt_mpt kvmgt_mpt = {
2026         .type = INTEL_GVT_HYPERVISOR_KVM,
2027         .host_init = kvmgt_host_init,
2028         .host_exit = kvmgt_host_exit,
2029         .attach_vgpu = kvmgt_attach_vgpu,
2030         .detach_vgpu = kvmgt_detach_vgpu,
2031         .inject_msi = kvmgt_inject_msi,
2032         .from_virt_to_mfn = kvmgt_virt_to_pfn,
2033         .enable_page_track = kvmgt_page_track_add,
2034         .disable_page_track = kvmgt_page_track_remove,
2035         .read_gpa = kvmgt_read_gpa,
2036         .write_gpa = kvmgt_write_gpa,
2037         .gfn_to_mfn = kvmgt_gfn_to_pfn,
2038         .dma_map_guest_page = kvmgt_dma_map_guest_page,
2039         .dma_unmap_guest_page = kvmgt_dma_unmap_guest_page,
2040         .set_opregion = kvmgt_set_opregion,
2041         .set_edid = kvmgt_set_edid,
2042         .get_vfio_device = kvmgt_get_vfio_device,
2043         .put_vfio_device = kvmgt_put_vfio_device,
2044         .is_valid_gfn = kvmgt_is_valid_gfn,
2045 };
2046
2047 static int __init kvmgt_init(void)
2048 {
2049         if (intel_gvt_register_hypervisor(&kvmgt_mpt) < 0)
2050                 return -ENODEV;
2051         return 0;
2052 }
2053
2054 static void __exit kvmgt_exit(void)
2055 {
2056         intel_gvt_unregister_hypervisor();
2057 }
2058
2059 module_init(kvmgt_init);
2060 module_exit(kvmgt_exit);
2061
2062 MODULE_LICENSE("GPL and additional rights");
2063 MODULE_AUTHOR("Intel Corporation");