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1/*
2 * QEMU memory mapping
3 *
4 * Copyright Fujitsu, Corp. 2011, 2012
5 *
6 * Authors:
7 * Wen Congyang <wency@cn.fujitsu.com>
8 *
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9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
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11 *
12 */
13
14#include "cpu.h"
15#include "cpu-all.h"
16#include "memory_mapping.h"
17
18static void memory_mapping_list_add_mapping_sorted(MemoryMappingList *list,
19 MemoryMapping *mapping)
20{
21 MemoryMapping *p;
22
23 QTAILQ_FOREACH(p, &list->head, next) {
24 if (p->phys_addr >= mapping->phys_addr) {
25 QTAILQ_INSERT_BEFORE(p, mapping, next);
26 return;
27 }
28 }
29 QTAILQ_INSERT_TAIL(&list->head, mapping, next);
30}
31
32static void create_new_memory_mapping(MemoryMappingList *list,
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33 hwaddr phys_addr,
34 hwaddr virt_addr,
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35 ram_addr_t length)
36{
37 MemoryMapping *memory_mapping;
38
39 memory_mapping = g_malloc(sizeof(MemoryMapping));
40 memory_mapping->phys_addr = phys_addr;
41 memory_mapping->virt_addr = virt_addr;
42 memory_mapping->length = length;
43 list->last_mapping = memory_mapping;
44 list->num++;
45 memory_mapping_list_add_mapping_sorted(list, memory_mapping);
46}
47
48static inline bool mapping_contiguous(MemoryMapping *map,
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49 hwaddr phys_addr,
50 hwaddr virt_addr)
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51{
52 return phys_addr == map->phys_addr + map->length &&
53 virt_addr == map->virt_addr + map->length;
54}
55
56/*
57 * [map->phys_addr, map->phys_addr + map->length) and
58 * [phys_addr, phys_addr + length) have intersection?
59 */
60static inline bool mapping_have_same_region(MemoryMapping *map,
a8170e5e 61 hwaddr phys_addr,
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62 ram_addr_t length)
63{
64 return !(phys_addr + length < map->phys_addr ||
65 phys_addr >= map->phys_addr + map->length);
66}
67
68/*
69 * [map->phys_addr, map->phys_addr + map->length) and
70 * [phys_addr, phys_addr + length) have intersection. The virtual address in the
71 * intersection are the same?
72 */
73static inline bool mapping_conflict(MemoryMapping *map,
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74 hwaddr phys_addr,
75 hwaddr virt_addr)
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76{
77 return virt_addr - map->virt_addr != phys_addr - map->phys_addr;
78}
79
80/*
81 * [map->virt_addr, map->virt_addr + map->length) and
82 * [virt_addr, virt_addr + length) have intersection. And the physical address
83 * in the intersection are the same.
84 */
85static inline void mapping_merge(MemoryMapping *map,
a8170e5e 86 hwaddr virt_addr,
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87 ram_addr_t length)
88{
89 if (virt_addr < map->virt_addr) {
90 map->length += map->virt_addr - virt_addr;
91 map->virt_addr = virt_addr;
92 }
93
94 if ((virt_addr + length) >
95 (map->virt_addr + map->length)) {
96 map->length = virt_addr + length - map->virt_addr;
97 }
98}
99
100void memory_mapping_list_add_merge_sorted(MemoryMappingList *list,
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101 hwaddr phys_addr,
102 hwaddr virt_addr,
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103 ram_addr_t length)
104{
105 MemoryMapping *memory_mapping, *last_mapping;
106
107 if (QTAILQ_EMPTY(&list->head)) {
108 create_new_memory_mapping(list, phys_addr, virt_addr, length);
109 return;
110 }
111
112 last_mapping = list->last_mapping;
113 if (last_mapping) {
114 if (mapping_contiguous(last_mapping, phys_addr, virt_addr)) {
115 last_mapping->length += length;
116 return;
117 }
118 }
119
120 QTAILQ_FOREACH(memory_mapping, &list->head, next) {
121 if (mapping_contiguous(memory_mapping, phys_addr, virt_addr)) {
122 memory_mapping->length += length;
123 list->last_mapping = memory_mapping;
124 return;
125 }
126
127 if (phys_addr + length < memory_mapping->phys_addr) {
128 /* create a new region before memory_mapping */
129 break;
130 }
131
132 if (mapping_have_same_region(memory_mapping, phys_addr, length)) {
133 if (mapping_conflict(memory_mapping, phys_addr, virt_addr)) {
134 continue;
135 }
136
137 /* merge this region into memory_mapping */
138 mapping_merge(memory_mapping, virt_addr, length);
139 list->last_mapping = memory_mapping;
140 return;
141 }
142 }
143
144 /* this region can not be merged into any existed memory mapping. */
145 create_new_memory_mapping(list, phys_addr, virt_addr, length);
146}
147
148void memory_mapping_list_free(MemoryMappingList *list)
149{
150 MemoryMapping *p, *q;
151
152 QTAILQ_FOREACH_SAFE(p, &list->head, next, q) {
153 QTAILQ_REMOVE(&list->head, p, next);
154 g_free(p);
155 }
156
157 list->num = 0;
158 list->last_mapping = NULL;
159}
160
161void memory_mapping_list_init(MemoryMappingList *list)
162{
163 list->num = 0;
164 list->last_mapping = NULL;
165 QTAILQ_INIT(&list->head);
166}
c517076d 167
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168static CPUArchState *find_paging_enabled_cpu(CPUArchState *start_cpu)
169{
170 CPUArchState *env;
171
172 for (env = start_cpu; env != NULL; env = env->next_cpu) {
173 if (cpu_paging_enabled(env)) {
174 return env;
175 }
176 }
177
178 return NULL;
179}
180
181int qemu_get_guest_memory_mapping(MemoryMappingList *list)
182{
183 CPUArchState *env, *first_paging_enabled_cpu;
184 RAMBlock *block;
185 ram_addr_t offset, length;
186 int ret;
187
188 first_paging_enabled_cpu = find_paging_enabled_cpu(first_cpu);
189 if (first_paging_enabled_cpu) {
190 for (env = first_paging_enabled_cpu; env != NULL; env = env->next_cpu) {
191 ret = cpu_get_memory_mapping(list, env);
192 if (ret < 0) {
193 return -1;
194 }
195 }
196 return 0;
197 }
198
199 /*
200 * If the guest doesn't use paging, the virtual address is equal to physical
201 * address.
202 */
203 QLIST_FOREACH(block, &ram_list.blocks, next) {
204 offset = block->offset;
205 length = block->length;
206 create_new_memory_mapping(list, offset, offset, length);
207 }
208
209 return 0;
210}
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211
212void qemu_get_guest_simple_memory_mapping(MemoryMappingList *list)
213{
214 RAMBlock *block;
215
216 QLIST_FOREACH(block, &ram_list.blocks, next) {
217 create_new_memory_mapping(list, block->offset, 0, block->length);
218 }
219}
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220
221void memory_mapping_filter(MemoryMappingList *list, int64_t begin,
222 int64_t length)
223{
224 MemoryMapping *cur, *next;
225
226 QTAILQ_FOREACH_SAFE(cur, &list->head, next, next) {
227 if (cur->phys_addr >= begin + length ||
228 cur->phys_addr + cur->length <= begin) {
229 QTAILQ_REMOVE(&list->head, cur, next);
230 list->num--;
231 continue;
232 }
233
234 if (cur->phys_addr < begin) {
235 cur->length -= begin - cur->phys_addr;
236 if (cur->virt_addr) {
237 cur->virt_addr += begin - cur->phys_addr;
238 }
239 cur->phys_addr = begin;
240 }
241
242 if (cur->phys_addr + cur->length > begin + length) {
243 cur->length -= cur->phys_addr + cur->length - begin - length;
244 }
245 }
246}