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
modify_region(struct acrn_vm * vm,struct vm_memory_region_op * region)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 */
acrn_mm_region_add(struct acrn_vm * vm,u64 user_gpa,u64 service_gpa,u64 size,u32 mem_type,u32 mem_access_right)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 */
acrn_mm_region_del(struct acrn_vm * vm,u64 user_gpa,u64 size)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
acrn_vm_memseg_map(struct acrn_vm * vm,struct acrn_vm_memmap * memmap)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
acrn_vm_memseg_unmap(struct acrn_vm * vm,struct acrn_vm_memmap * memmap)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 */
acrn_vm_ram_map(struct acrn_vm * vm,struct acrn_vm_memmap * memmap)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 */
acrn_vm_all_ram_unmap(struct acrn_vm * vm)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 }
307
