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-rw-r--r--arch/um/kernel/tlb.c267
1 files changed, 142 insertions, 125 deletions
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 83ec8d4747fd..80ed6188e8a2 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -15,12 +15,118 @@
15#include "mem_user.h" 15#include "mem_user.h"
16#include "os.h" 16#include "os.h"
17 17
18static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
19 int r, int w, int x, struct host_vm_op *ops, int *index,
20 int last_filled, union mm_context *mmu, void **flush,
21 int (*do_ops)(union mm_context *, struct host_vm_op *,
22 int, int, void **))
23{
24 __u64 offset;
25 struct host_vm_op *last;
26 int fd, ret = 0;
27
28 fd = phys_mapping(phys, &offset);
29 if(*index != -1){
30 last = &ops[*index];
31 if((last->type == MMAP) &&
32 (last->u.mmap.addr + last->u.mmap.len == virt) &&
33 (last->u.mmap.r == r) && (last->u.mmap.w == w) &&
34 (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
35 (last->u.mmap.offset + last->u.mmap.len == offset)){
36 last->u.mmap.len += len;
37 return 0;
38 }
39 }
40
41 if(*index == last_filled){
42 ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
43 *index = -1;
44 }
45
46 ops[++*index] = ((struct host_vm_op) { .type = MMAP,
47 .u = { .mmap = {
48 .addr = virt,
49 .len = len,
50 .r = r,
51 .w = w,
52 .x = x,
53 .fd = fd,
54 .offset = offset }
55 } });
56 return ret;
57}
58
59static int add_munmap(unsigned long addr, unsigned long len,
60 struct host_vm_op *ops, int *index, int last_filled,
61 union mm_context *mmu, void **flush,
62 int (*do_ops)(union mm_context *, struct host_vm_op *,
63 int, int, void **))
64{
65 struct host_vm_op *last;
66 int ret = 0;
67
68 if(*index != -1){
69 last = &ops[*index];
70 if((last->type == MUNMAP) &&
71 (last->u.munmap.addr + last->u.mmap.len == addr)){
72 last->u.munmap.len += len;
73 return 0;
74 }
75 }
76
77 if(*index == last_filled){
78 ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
79 *index = -1;
80 }
81
82 ops[++*index] = ((struct host_vm_op) { .type = MUNMAP,
83 .u = { .munmap = {
84 .addr = addr,
85 .len = len } } });
86 return ret;
87}
88
89static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
90 int x, struct host_vm_op *ops, int *index,
91 int last_filled, union mm_context *mmu, void **flush,
92 int (*do_ops)(union mm_context *, struct host_vm_op *,
93 int, int, void **))
94{
95 struct host_vm_op *last;
96 int ret = 0;
97
98 if(*index != -1){
99 last = &ops[*index];
100 if((last->type == MPROTECT) &&
101 (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
102 (last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&
103 (last->u.mprotect.x == x)){
104 last->u.mprotect.len += len;
105 return 0;
106 }
107 }
108
109 if(*index == last_filled){
110 ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
111 *index = -1;
112 }
113
114 ops[++*index] = ((struct host_vm_op) { .type = MPROTECT,
115 .u = { .mprotect = {
116 .addr = addr,
117 .len = len,
118 .r = r,
119 .w = w,
120 .x = x } } });
121 return ret;
122}
123
18#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1)) 124#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
19 125
20void fix_range_common(struct mm_struct *mm, unsigned long start_addr, 126void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
21 unsigned long end_addr, int force, 127 unsigned long end_addr, int force,
22 void (*do_ops)(union mm_context *, struct host_vm_op *, 128 int (*do_ops)(union mm_context *, struct host_vm_op *,
23 int)) 129 int, int, void **))
24{ 130{
25 pgd_t *npgd; 131 pgd_t *npgd;
26 pud_t *npud; 132 pud_t *npud;
@@ -29,21 +135,24 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
29 union mm_context *mmu = &mm->context; 135 union mm_context *mmu = &mm->context;
30 unsigned long addr, end; 136 unsigned long addr, end;
31 int r, w, x; 137 int r, w, x;
32 struct host_vm_op ops[16]; 138 struct host_vm_op ops[1];
139 void *flush = NULL;
33 int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1; 140 int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1;
141 int ret = 0;
34 142
35 if(mm == NULL) return; 143 if(mm == NULL) return;
36 144
37 for(addr = start_addr; addr < end_addr;){ 145 ops[0].type = NONE;
146 for(addr = start_addr; addr < end_addr && !ret;){
38 npgd = pgd_offset(mm, addr); 147 npgd = pgd_offset(mm, addr);
39 if(!pgd_present(*npgd)){ 148 if(!pgd_present(*npgd)){
40 end = ADD_ROUND(addr, PGDIR_SIZE); 149 end = ADD_ROUND(addr, PGDIR_SIZE);
41 if(end > end_addr) 150 if(end > end_addr)
42 end = end_addr; 151 end = end_addr;
43 if(force || pgd_newpage(*npgd)){ 152 if(force || pgd_newpage(*npgd)){
44 op_index = add_munmap(addr, end - addr, ops, 153 ret = add_munmap(addr, end - addr, ops,
45 op_index, last_op, mmu, 154 &op_index, last_op, mmu,
46 do_ops); 155 &flush, do_ops);
47 pgd_mkuptodate(*npgd); 156 pgd_mkuptodate(*npgd);
48 } 157 }
49 addr = end; 158 addr = end;
@@ -56,9 +165,9 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
56 if(end > end_addr) 165 if(end > end_addr)
57 end = end_addr; 166 end = end_addr;
58 if(force || pud_newpage(*npud)){ 167 if(force || pud_newpage(*npud)){
59 op_index = add_munmap(addr, end - addr, ops, 168 ret = add_munmap(addr, end - addr, ops,
60 op_index, last_op, mmu, 169 &op_index, last_op, mmu,
61 do_ops); 170 &flush, do_ops);
62 pud_mkuptodate(*npud); 171 pud_mkuptodate(*npud);
63 } 172 }
64 addr = end; 173 addr = end;
@@ -71,9 +180,9 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
71 if(end > end_addr) 180 if(end > end_addr)
72 end = end_addr; 181 end = end_addr;
73 if(force || pmd_newpage(*npmd)){ 182 if(force || pmd_newpage(*npmd)){
74 op_index = add_munmap(addr, end - addr, ops, 183 ret = add_munmap(addr, end - addr, ops,
75 op_index, last_op, mmu, 184 &op_index, last_op, mmu,
76 do_ops); 185 &flush, do_ops);
77 pmd_mkuptodate(*npmd); 186 pmd_mkuptodate(*npmd);
78 } 187 }
79 addr = end; 188 addr = end;
@@ -92,24 +201,32 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
92 } 201 }
93 if(force || pte_newpage(*npte)){ 202 if(force || pte_newpage(*npte)){
94 if(pte_present(*npte)) 203 if(pte_present(*npte))
95 op_index = add_mmap(addr, 204 ret = add_mmap(addr,
96 pte_val(*npte) & PAGE_MASK, 205 pte_val(*npte) & PAGE_MASK,
97 PAGE_SIZE, r, w, x, ops, 206 PAGE_SIZE, r, w, x, ops,
98 op_index, last_op, mmu, 207 &op_index, last_op, mmu,
99 do_ops); 208 &flush, do_ops);
100 else op_index = add_munmap(addr, PAGE_SIZE, ops, 209 else ret = add_munmap(addr, PAGE_SIZE, ops,
101 op_index, last_op, mmu, 210 &op_index, last_op, mmu,
102 do_ops); 211 &flush, do_ops);
103 } 212 }
104 else if(pte_newprot(*npte)) 213 else if(pte_newprot(*npte))
105 op_index = add_mprotect(addr, PAGE_SIZE, r, w, x, ops, 214 ret = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,
106 op_index, last_op, mmu, 215 &op_index, last_op, mmu,
107 do_ops); 216 &flush, do_ops);
108 217
109 *npte = pte_mkuptodate(*npte); 218 *npte = pte_mkuptodate(*npte);
110 addr += PAGE_SIZE; 219 addr += PAGE_SIZE;
111 } 220 }
112 (*do_ops)(mmu, ops, op_index); 221
222 if(!ret)
223 ret = (*do_ops)(mmu, ops, op_index, 1, &flush);
224
225 /* This is not an else because ret is modified above */
226 if(ret) {
227 printk("fix_range_common: failed, killing current process\n");
228 force_sig(SIGKILL, current);
229 }
113} 230}
114 231
115int flush_tlb_kernel_range_common(unsigned long start, unsigned long end) 232int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
@@ -226,106 +343,6 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr)
226 return(pte_offset_map(pmd, addr)); 343 return(pte_offset_map(pmd, addr));
227} 344}
228 345
229int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
230 int r, int w, int x, struct host_vm_op *ops, int index,
231 int last_filled, union mm_context *mmu,
232 void (*do_ops)(union mm_context *, struct host_vm_op *, int))
233{
234 __u64 offset;
235 struct host_vm_op *last;
236 int fd;
237
238 fd = phys_mapping(phys, &offset);
239 if(index != -1){
240 last = &ops[index];
241 if((last->type == MMAP) &&
242 (last->u.mmap.addr + last->u.mmap.len == virt) &&
243 (last->u.mmap.r == r) && (last->u.mmap.w == w) &&
244 (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
245 (last->u.mmap.offset + last->u.mmap.len == offset)){
246 last->u.mmap.len += len;
247 return(index);
248 }
249 }
250
251 if(index == last_filled){
252 (*do_ops)(mmu, ops, last_filled);
253 index = -1;
254 }
255
256 ops[++index] = ((struct host_vm_op) { .type = MMAP,
257 .u = { .mmap = {
258 .addr = virt,
259 .len = len,
260 .r = r,
261 .w = w,
262 .x = x,
263 .fd = fd,
264 .offset = offset }
265 } });
266 return(index);
267}
268
269int add_munmap(unsigned long addr, unsigned long len, struct host_vm_op *ops,
270 int index, int last_filled, union mm_context *mmu,
271 void (*do_ops)(union mm_context *, struct host_vm_op *, int))
272{
273 struct host_vm_op *last;
274
275 if(index != -1){
276 last = &ops[index];
277 if((last->type == MUNMAP) &&
278 (last->u.munmap.addr + last->u.mmap.len == addr)){
279 last->u.munmap.len += len;
280 return(index);
281 }
282 }
283
284 if(index == last_filled){
285 (*do_ops)(mmu, ops, last_filled);
286 index = -1;
287 }
288
289 ops[++index] = ((struct host_vm_op) { .type = MUNMAP,
290 .u = { .munmap = {
291 .addr = addr,
292 .len = len } } });
293 return(index);
294}
295
296int add_mprotect(unsigned long addr, unsigned long len, int r, int w, int x,
297 struct host_vm_op *ops, int index, int last_filled,
298 union mm_context *mmu,
299 void (*do_ops)(union mm_context *, struct host_vm_op *, int))
300{
301 struct host_vm_op *last;
302
303 if(index != -1){
304 last = &ops[index];
305 if((last->type == MPROTECT) &&
306 (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
307 (last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&
308 (last->u.mprotect.x == x)){
309 last->u.mprotect.len += len;
310 return(index);
311 }
312 }
313
314 if(index == last_filled){
315 (*do_ops)(mmu, ops, last_filled);
316 index = -1;
317 }
318
319 ops[++index] = ((struct host_vm_op) { .type = MPROTECT,
320 .u = { .mprotect = {
321 .addr = addr,
322 .len = len,
323 .r = r,
324 .w = w,
325 .x = x } } });
326 return(index);
327}
328
329void flush_tlb_page(struct vm_area_struct *vma, unsigned long address) 346void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
330{ 347{
331 address &= PAGE_MASK; 348 address &= PAGE_MASK;
generated by cgit v1.2.2 (git 2.25.0) at 2025-05-30 13:12:28 -0400