drivers/virt/acrn/mm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ACRN: Memory mapping management
   4  *
   5  * Copyright (C) 2020 Intel Corporation. All rights reserved.
   6  *
   7  * Authors:
   8  *      Fei Li <lei1.li@intel.com>
   9  *      Shuo Liu <shuo.a.liu@intel.com>
  10  */
  11
  12 #include <linux/io.h>
  13 #include <linux/mm.h>
  14 #include <linux/slab.h>
  15
  16 #include "acrn_drv.h"
  17
  18 static int modify_region(struct acrn_vm *vm, struct vm_memory_region_op *region)
  19 {
  20         struct vm_memory_region_batch *regions;
  21         int ret;
  22
  23         regions = kzalloc(sizeof(*regions), GFP_KERNEL);
  24         if (!regions)
  25                 return -ENOMEM;
  26
  27         regions->vmid = vm->vmid;
  28         regions->regions_num = 1;
  29         regions->regions_gpa = virt_to_phys(region);
  30
  31         ret = hcall_set_memory_regions(virt_to_phys(regions));
  32         if (ret < 0)
  33                 dev_dbg(acrn_dev.this_device,
  34                         "Failed to set memory region for VM[%u]!\n", vm->vmid);
  35
  36         kfree(regions);
  37         return ret;
  38 }
  39
  40 /**
  41  * acrn_mm_region_add() - Set up the EPT mapping of a memory region.
  42  * @vm:                 User VM.
  43  * @user_gpa:           A GPA of User VM.
  44  * @service_gpa:        A GPA of Service VM.
  45  * @size:               Size of the region.
  46  * @mem_type:           Combination of ACRN_MEM_TYPE_*.
  47  * @mem_access_right:   Combination of ACRN_MEM_ACCESS_*.
  48  *
  49  * Return: 0 on success, <0 on error.
  50  */
  51 int acrn_mm_region_add(struct acrn_vm *vm, u64 user_gpa, u64 service_gpa,
  52                        u64 size, u32 mem_type, u32 mem_access_right)
  53 {
  54         struct vm_memory_region_op *region;
  55         int ret = 0;
  56
  57         region = kzalloc(sizeof(*region), GFP_KERNEL);
  58         if (!region)
  59                 return -ENOMEM;
  60
  61         region->type = ACRN_MEM_REGION_ADD;
  62         region->user_vm_pa = user_gpa;
  63         region->service_vm_pa = service_gpa;
  64         region->size = size;
  65         region->attr = ((mem_type & ACRN_MEM_TYPE_MASK) |
  66                         (mem_access_right & ACRN_MEM_ACCESS_RIGHT_MASK));
  67         ret = modify_region(vm, region);
  68
  69         dev_dbg(acrn_dev.this_device,
  70                 "%s: user-GPA[%pK] service-GPA[%pK] size[0x%llx].\n",
  71                 __func__, (void *)user_gpa, (void *)service_gpa, size);
  72         kfree(region);
  73         return ret;
  74 }
  75
  76 /**
  77  * acrn_mm_region_del() - Del the EPT mapping of a memory region.
  78  * @vm:         User VM.
  79  * @user_gpa:   A GPA of the User VM.
  80  * @size:       Size of the region.
  81  *
  82  * Return: 0 on success, <0 for error.
  83  */
  84 int acrn_mm_region_del(struct acrn_vm *vm, u64 user_gpa, u64 size)
  85 {
  86         struct vm_memory_region_op *region;
  87         int ret = 0;
  88
  89         region = kzalloc(sizeof(*region), GFP_KERNEL);
  90         if (!region)
  91                 return -ENOMEM;
  92
  93         region->type = ACRN_MEM_REGION_DEL;
  94         region->user_vm_pa = user_gpa;
  95         region->service_vm_pa = 0UL;
  96         region->size = size;
  97         region->attr = 0U;
  98
  99         ret = modify_region(vm, region);
 100
 101         dev_dbg(acrn_dev.this_device, "%s: user-GPA[%pK] size[0x%llx].\n",
 102                 __func__, (void *)user_gpa, size);
 103         kfree(region);
 104         return ret;
 105 }
 106
 107 int acrn_vm_memseg_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
 108 {
 109         int ret;
 110
 111         if (memmap->type == ACRN_MEMMAP_RAM)
 112                 return acrn_vm_ram_map(vm, memmap);
 113
 114         if (memmap->type != ACRN_MEMMAP_MMIO) {
 115                 dev_dbg(acrn_dev.this_device,
 116                         "Invalid memmap type: %u\n", memmap->type);
 117                 return -EINVAL;
 118         }
 119
 120         ret = acrn_mm_region_add(vm, memmap->user_vm_pa,
 121                                  memmap->service_vm_pa, memmap->len,
 122                                  ACRN_MEM_TYPE_UC, memmap->attr);
 123         if (ret < 0)
 124                 dev_dbg(acrn_dev.this_device,
 125                         "Add memory region failed, VM[%u]!\n", vm->vmid);
 126
 127         return ret;
 128 }
 129
 130 int acrn_vm_memseg_unmap(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
 131 {
 132         int ret;
 133
 134         if (memmap->type != ACRN_MEMMAP_MMIO) {
 135                 dev_dbg(acrn_dev.this_device,
 136                         "Invalid memmap type: %u\n", memmap->type);
 137                 return -EINVAL;
 138         }
 139
 140         ret = acrn_mm_region_del(vm, memmap->user_vm_pa, memmap->len);
 141         if (ret < 0)
 142                 dev_dbg(acrn_dev.this_device,
 143                         "Del memory region failed, VM[%u]!\n", vm->vmid);
 144
 145         return ret;
 146 }
 147
 148 /**
 149  * acrn_vm_ram_map() - Create a RAM EPT mapping of User VM.
 150  * @vm:         The User VM pointer
 151  * @memmap:     Info of the EPT mapping
 152  *
 153  * Return: 0 on success, <0 for error.
 154  */
 155 int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
 156 {
 157         struct vm_memory_region_batch *regions_info;
 158         int nr_pages, i = 0, order, nr_regions = 0;
 159         struct vm_memory_mapping *region_mapping;
 160         struct vm_memory_region_op *vm_region;
 161         struct page **pages = NULL, *page;
 162         void *remap_vaddr;
 163         int ret, pinned;
 164         u64 user_vm_pa;
 165
 166         if (!vm || !memmap)
 167                 return -EINVAL;
 168
 169         /* Get the page number of the map region */
 170         nr_pages = memmap->len >> PAGE_SHIFT;
 171         pages = vzalloc(nr_pages * sizeof(struct page *));
 172         if (!pages)
 173                 return -ENOMEM;
 174
 175         /* Lock the pages of user memory map region */
 176         pinned = pin_user_pages_fast(memmap->vma_base,
 177                                      nr_pages, FOLL_WRITE | FOLL_LONGTERM,
 178                                      pages);
 179         if (pinned < 0) {
 180                 ret = pinned;
 181                 goto free_pages;
 182         } else if (pinned != nr_pages) {
 183                 ret = -EFAULT;
 184                 goto put_pages;
 185         }
 186
 187         /* Create a kernel map for the map region */
 188         remap_vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
 189         if (!remap_vaddr) {
 190                 ret = -ENOMEM;
 191                 goto put_pages;
 192         }
 193
 194         /* Record Service VM va <-> User VM pa mapping */
 195         mutex_lock(&vm->regions_mapping_lock);
 196         region_mapping = &vm->regions_mapping[vm->regions_mapping_count];
 197         if (vm->regions_mapping_count < ACRN_MEM_MAPPING_MAX) {
 198                 region_mapping->pages = pages;
 199                 region_mapping->npages = nr_pages;
 200                 region_mapping->size = memmap->len;
 201                 region_mapping->service_vm_va = remap_vaddr;
 202                 region_mapping->user_vm_pa = memmap->user_vm_pa;
 203                 vm->regions_mapping_count++;
 204         } else {
 205                 dev_warn(acrn_dev.this_device,
 206                         "Run out of memory mapping slots!\n");
 207                 ret = -ENOMEM;
 208                 mutex_unlock(&vm->regions_mapping_lock);
 209                 goto unmap_no_count;
 210         }
 211         mutex_unlock(&vm->regions_mapping_lock);
 212
 213         /* Calculate count of vm_memory_region_op */
 214         while (i < nr_pages) {
 215                 page = pages[i];
 216                 VM_BUG_ON_PAGE(PageTail(page), page);
 217                 order = compound_order(page);
 218                 nr_regions++;
 219                 i += 1 << order;
 220         }
 221
 222         /* Prepare the vm_memory_region_batch */
 223         regions_info = kzalloc(sizeof(*regions_info) +
 224                                sizeof(*vm_region) * nr_regions,
 225                                GFP_KERNEL);
 226         if (!regions_info) {
 227                 ret = -ENOMEM;
 228                 goto unmap_kernel_map;
 229         }
 230
 231         /* Fill each vm_memory_region_op */
 232         vm_region = (struct vm_memory_region_op *)(regions_info + 1);
 233         regions_info->vmid = vm->vmid;
 234         regions_info->regions_num = nr_regions;
 235         regions_info->regions_gpa = virt_to_phys(vm_region);
 236         user_vm_pa = memmap->user_vm_pa;
 237         i = 0;
 238         while (i < nr_pages) {
 239                 u32 region_size;
 240
 241                 page = pages[i];
 242                 VM_BUG_ON_PAGE(PageTail(page), page);
 243                 order = compound_order(page);
 244                 region_size = PAGE_SIZE << order;
 245                 vm_region->type = ACRN_MEM_REGION_ADD;
 246                 vm_region->user_vm_pa = user_vm_pa;
 247                 vm_region->service_vm_pa = page_to_phys(page);
 248                 vm_region->size = region_size;
 249                 vm_region->attr = (ACRN_MEM_TYPE_WB & ACRN_MEM_TYPE_MASK) |
 250                                   (memmap->attr & ACRN_MEM_ACCESS_RIGHT_MASK);
 251
 252                 vm_region++;
 253                 user_vm_pa += region_size;
 254                 i += 1 << order;
 255         }
 256
 257         /* Inform the ACRN Hypervisor to set up EPT mappings */
 258         ret = hcall_set_memory_regions(virt_to_phys(regions_info));
 259         if (ret < 0) {
 260                 dev_dbg(acrn_dev.this_device,
 261                         "Failed to set regions, VM[%u]!\n", vm->vmid);
 262                 goto unset_region;
 263         }
 264         kfree(regions_info);
 265
 266         dev_dbg(acrn_dev.this_device,
 267                 "%s: VM[%u] service-GVA[%pK] user-GPA[%pK] size[0x%llx]\n",
 268                 __func__, vm->vmid,
 269                 remap_vaddr, (void *)memmap->user_vm_pa, memmap->len);
 270         return ret;
 271
 272 unset_region:
 273         kfree(regions_info);
 274 unmap_kernel_map:
 275         mutex_lock(&vm->regions_mapping_lock);
 276         vm->regions_mapping_count--;
 277         mutex_unlock(&vm->regions_mapping_lock);
 278 unmap_no_count:
 279         vunmap(remap_vaddr);
 280 put_pages:
 281         for (i = 0; i < pinned; i++)
 282                 unpin_user_page(pages[i]);
 283 free_pages:
 284         vfree(pages);
 285         return ret;
 286 }
 287
 288 /**
 289  * acrn_vm_all_ram_unmap() - Destroy a RAM EPT mapping of User VM.
 290  * @vm: The User VM
 291  */
 292 void acrn_vm_all_ram_unmap(struct acrn_vm *vm)
 293 {
 294         struct vm_memory_mapping *region_mapping;
 295         int i, j;
 296
 297         mutex_lock(&vm->regions_mapping_lock);
 298         for (i = 0; i < vm->regions_mapping_count; i++) {
 299                 region_mapping = &vm->regions_mapping[i];
 300                 vunmap(region_mapping->service_vm_va);
 301                 for (j = 0; j < region_mapping->npages; j++)
 302                         unpin_user_page(region_mapping->pages[j]);
 303                 vfree(region_mapping->pages);
 304         }
 305         mutex_unlock(&vm->regions_mapping_lock);
 306 }