Loading...
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/mm.h>
7#include <linux/module.h>
8#include <linux/sched.h>
9#include <asm/pgtable.h>
10#include <asm/tlbflush.h>
11#include "as-layout.h"
12#include "mem_user.h"
13#include "os.h"
14#include "skas.h"
15
16struct host_vm_change {
17 struct host_vm_op {
18 enum { NONE, MMAP, MUNMAP, MPROTECT } type;
19 union {
20 struct {
21 unsigned long addr;
22 unsigned long len;
23 unsigned int prot;
24 int fd;
25 __u64 offset;
26 } mmap;
27 struct {
28 unsigned long addr;
29 unsigned long len;
30 } munmap;
31 struct {
32 unsigned long addr;
33 unsigned long len;
34 unsigned int prot;
35 } mprotect;
36 } u;
37 } ops[1];
38 int index;
39 struct mm_id *id;
40 void *data;
41 int force;
42};
43
44#define INIT_HVC(mm, force) \
45 ((struct host_vm_change) \
46 { .ops = { { .type = NONE } }, \
47 .id = &mm->context.id, \
48 .data = NULL, \
49 .index = 0, \
50 .force = force })
51
52static int do_ops(struct host_vm_change *hvc, int end,
53 int finished)
54{
55 struct host_vm_op *op;
56 int i, ret = 0;
57
58 for (i = 0; i < end && !ret; i++) {
59 op = &hvc->ops[i];
60 switch (op->type) {
61 case MMAP:
62 ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
63 op->u.mmap.prot, op->u.mmap.fd,
64 op->u.mmap.offset, finished, &hvc->data);
65 break;
66 case MUNMAP:
67 ret = unmap(hvc->id, op->u.munmap.addr,
68 op->u.munmap.len, finished, &hvc->data);
69 break;
70 case MPROTECT:
71 ret = protect(hvc->id, op->u.mprotect.addr,
72 op->u.mprotect.len, op->u.mprotect.prot,
73 finished, &hvc->data);
74 break;
75 default:
76 printk(KERN_ERR "Unknown op type %d in do_ops\n",
77 op->type);
78 BUG();
79 break;
80 }
81 }
82
83 return ret;
84}
85
86static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
87 unsigned int prot, struct host_vm_change *hvc)
88{
89 __u64 offset;
90 struct host_vm_op *last;
91 int fd, ret = 0;
92
93 fd = phys_mapping(phys, &offset);
94 if (hvc->index != 0) {
95 last = &hvc->ops[hvc->index - 1];
96 if ((last->type == MMAP) &&
97 (last->u.mmap.addr + last->u.mmap.len == virt) &&
98 (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
99 (last->u.mmap.offset + last->u.mmap.len == offset)) {
100 last->u.mmap.len += len;
101 return 0;
102 }
103 }
104
105 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
106 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
107 hvc->index = 0;
108 }
109
110 hvc->ops[hvc->index++] = ((struct host_vm_op)
111 { .type = MMAP,
112 .u = { .mmap = { .addr = virt,
113 .len = len,
114 .prot = prot,
115 .fd = fd,
116 .offset = offset }
117 } });
118 return ret;
119}
120
121static int add_munmap(unsigned long addr, unsigned long len,
122 struct host_vm_change *hvc)
123{
124 struct host_vm_op *last;
125 int ret = 0;
126
127 if (hvc->index != 0) {
128 last = &hvc->ops[hvc->index - 1];
129 if ((last->type == MUNMAP) &&
130 (last->u.munmap.addr + last->u.mmap.len == addr)) {
131 last->u.munmap.len += len;
132 return 0;
133 }
134 }
135
136 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
137 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
138 hvc->index = 0;
139 }
140
141 hvc->ops[hvc->index++] = ((struct host_vm_op)
142 { .type = MUNMAP,
143 .u = { .munmap = { .addr = addr,
144 .len = len } } });
145 return ret;
146}
147
148static int add_mprotect(unsigned long addr, unsigned long len,
149 unsigned int prot, struct host_vm_change *hvc)
150{
151 struct host_vm_op *last;
152 int ret = 0;
153
154 if (hvc->index != 0) {
155 last = &hvc->ops[hvc->index - 1];
156 if ((last->type == MPROTECT) &&
157 (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
158 (last->u.mprotect.prot == prot)) {
159 last->u.mprotect.len += len;
160 return 0;
161 }
162 }
163
164 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
165 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
166 hvc->index = 0;
167 }
168
169 hvc->ops[hvc->index++] = ((struct host_vm_op)
170 { .type = MPROTECT,
171 .u = { .mprotect = { .addr = addr,
172 .len = len,
173 .prot = prot } } });
174 return ret;
175}
176
177#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
178
179static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
180 unsigned long end,
181 struct host_vm_change *hvc)
182{
183 pte_t *pte;
184 int r, w, x, prot, ret = 0;
185
186 pte = pte_offset_kernel(pmd, addr);
187 do {
188 if ((addr >= STUB_START) && (addr < STUB_END))
189 continue;
190
191 r = pte_read(*pte);
192 w = pte_write(*pte);
193 x = pte_exec(*pte);
194 if (!pte_young(*pte)) {
195 r = 0;
196 w = 0;
197 } else if (!pte_dirty(*pte))
198 w = 0;
199
200 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
201 (x ? UM_PROT_EXEC : 0));
202 if (hvc->force || pte_newpage(*pte)) {
203 if (pte_present(*pte))
204 ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
205 PAGE_SIZE, prot, hvc);
206 else
207 ret = add_munmap(addr, PAGE_SIZE, hvc);
208 } else if (pte_newprot(*pte))
209 ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
210 *pte = pte_mkuptodate(*pte);
211 } while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
212 return ret;
213}
214
215static inline int update_pmd_range(pud_t *pud, unsigned long addr,
216 unsigned long end,
217 struct host_vm_change *hvc)
218{
219 pmd_t *pmd;
220 unsigned long next;
221 int ret = 0;
222
223 pmd = pmd_offset(pud, addr);
224 do {
225 next = pmd_addr_end(addr, end);
226 if (!pmd_present(*pmd)) {
227 if (hvc->force || pmd_newpage(*pmd)) {
228 ret = add_munmap(addr, next - addr, hvc);
229 pmd_mkuptodate(*pmd);
230 }
231 }
232 else ret = update_pte_range(pmd, addr, next, hvc);
233 } while (pmd++, addr = next, ((addr < end) && !ret));
234 return ret;
235}
236
237static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
238 unsigned long end,
239 struct host_vm_change *hvc)
240{
241 pud_t *pud;
242 unsigned long next;
243 int ret = 0;
244
245 pud = pud_offset(pgd, addr);
246 do {
247 next = pud_addr_end(addr, end);
248 if (!pud_present(*pud)) {
249 if (hvc->force || pud_newpage(*pud)) {
250 ret = add_munmap(addr, next - addr, hvc);
251 pud_mkuptodate(*pud);
252 }
253 }
254 else ret = update_pmd_range(pud, addr, next, hvc);
255 } while (pud++, addr = next, ((addr < end) && !ret));
256 return ret;
257}
258
259void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
260 unsigned long end_addr, int force)
261{
262 pgd_t *pgd;
263 struct host_vm_change hvc;
264 unsigned long addr = start_addr, next;
265 int ret = 0;
266
267 hvc = INIT_HVC(mm, force);
268 pgd = pgd_offset(mm, addr);
269 do {
270 next = pgd_addr_end(addr, end_addr);
271 if (!pgd_present(*pgd)) {
272 if (force || pgd_newpage(*pgd)) {
273 ret = add_munmap(addr, next - addr, &hvc);
274 pgd_mkuptodate(*pgd);
275 }
276 }
277 else ret = update_pud_range(pgd, addr, next, &hvc);
278 } while (pgd++, addr = next, ((addr < end_addr) && !ret));
279
280 if (!ret)
281 ret = do_ops(&hvc, hvc.index, 1);
282
283 /* This is not an else because ret is modified above */
284 if (ret) {
285 printk(KERN_ERR "fix_range_common: failed, killing current "
286 "process\n");
287 force_sig(SIGKILL, current);
288 }
289}
290
291static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
292{
293 struct mm_struct *mm;
294 pgd_t *pgd;
295 pud_t *pud;
296 pmd_t *pmd;
297 pte_t *pte;
298 unsigned long addr, last;
299 int updated = 0, err;
300
301 mm = &init_mm;
302 for (addr = start; addr < end;) {
303 pgd = pgd_offset(mm, addr);
304 if (!pgd_present(*pgd)) {
305 last = ADD_ROUND(addr, PGDIR_SIZE);
306 if (last > end)
307 last = end;
308 if (pgd_newpage(*pgd)) {
309 updated = 1;
310 err = os_unmap_memory((void *) addr,
311 last - addr);
312 if (err < 0)
313 panic("munmap failed, errno = %d\n",
314 -err);
315 }
316 addr = last;
317 continue;
318 }
319
320 pud = pud_offset(pgd, addr);
321 if (!pud_present(*pud)) {
322 last = ADD_ROUND(addr, PUD_SIZE);
323 if (last > end)
324 last = end;
325 if (pud_newpage(*pud)) {
326 updated = 1;
327 err = os_unmap_memory((void *) addr,
328 last - addr);
329 if (err < 0)
330 panic("munmap failed, errno = %d\n",
331 -err);
332 }
333 addr = last;
334 continue;
335 }
336
337 pmd = pmd_offset(pud, addr);
338 if (!pmd_present(*pmd)) {
339 last = ADD_ROUND(addr, PMD_SIZE);
340 if (last > end)
341 last = end;
342 if (pmd_newpage(*pmd)) {
343 updated = 1;
344 err = os_unmap_memory((void *) addr,
345 last - addr);
346 if (err < 0)
347 panic("munmap failed, errno = %d\n",
348 -err);
349 }
350 addr = last;
351 continue;
352 }
353
354 pte = pte_offset_kernel(pmd, addr);
355 if (!pte_present(*pte) || pte_newpage(*pte)) {
356 updated = 1;
357 err = os_unmap_memory((void *) addr,
358 PAGE_SIZE);
359 if (err < 0)
360 panic("munmap failed, errno = %d\n",
361 -err);
362 if (pte_present(*pte))
363 map_memory(addr,
364 pte_val(*pte) & PAGE_MASK,
365 PAGE_SIZE, 1, 1, 1);
366 }
367 else if (pte_newprot(*pte)) {
368 updated = 1;
369 os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
370 }
371 addr += PAGE_SIZE;
372 }
373 return updated;
374}
375
376void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
377{
378 pgd_t *pgd;
379 pud_t *pud;
380 pmd_t *pmd;
381 pte_t *pte;
382 struct mm_struct *mm = vma->vm_mm;
383 void *flush = NULL;
384 int r, w, x, prot, err = 0;
385 struct mm_id *mm_id;
386
387 address &= PAGE_MASK;
388 pgd = pgd_offset(mm, address);
389 if (!pgd_present(*pgd))
390 goto kill;
391
392 pud = pud_offset(pgd, address);
393 if (!pud_present(*pud))
394 goto kill;
395
396 pmd = pmd_offset(pud, address);
397 if (!pmd_present(*pmd))
398 goto kill;
399
400 pte = pte_offset_kernel(pmd, address);
401
402 r = pte_read(*pte);
403 w = pte_write(*pte);
404 x = pte_exec(*pte);
405 if (!pte_young(*pte)) {
406 r = 0;
407 w = 0;
408 } else if (!pte_dirty(*pte)) {
409 w = 0;
410 }
411
412 mm_id = &mm->context.id;
413 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
414 (x ? UM_PROT_EXEC : 0));
415 if (pte_newpage(*pte)) {
416 if (pte_present(*pte)) {
417 unsigned long long offset;
418 int fd;
419
420 fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
421 err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
422 1, &flush);
423 }
424 else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
425 }
426 else if (pte_newprot(*pte))
427 err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
428
429 if (err)
430 goto kill;
431
432 *pte = pte_mkuptodate(*pte);
433
434 return;
435
436kill:
437 printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
438 force_sig(SIGKILL, current);
439}
440
441pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
442{
443 return pgd_offset(mm, address);
444}
445
446pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
447{
448 return pud_offset(pgd, address);
449}
450
451pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
452{
453 return pmd_offset(pud, address);
454}
455
456pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
457{
458 return pte_offset_kernel(pmd, address);
459}
460
461pte_t *addr_pte(struct task_struct *task, unsigned long addr)
462{
463 pgd_t *pgd = pgd_offset(task->mm, addr);
464 pud_t *pud = pud_offset(pgd, addr);
465 pmd_t *pmd = pmd_offset(pud, addr);
466
467 return pte_offset_map(pmd, addr);
468}
469
470void flush_tlb_all(void)
471{
472 flush_tlb_mm(current->mm);
473}
474
475void flush_tlb_kernel_range(unsigned long start, unsigned long end)
476{
477 flush_tlb_kernel_range_common(start, end);
478}
479
480void flush_tlb_kernel_vm(void)
481{
482 flush_tlb_kernel_range_common(start_vm, end_vm);
483}
484
485void __flush_tlb_one(unsigned long addr)
486{
487 flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
488}
489
490static void fix_range(struct mm_struct *mm, unsigned long start_addr,
491 unsigned long end_addr, int force)
492{
493 fix_range_common(mm, start_addr, end_addr, force);
494}
495
496void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
497 unsigned long end)
498{
499 if (vma->vm_mm == NULL)
500 flush_tlb_kernel_range_common(start, end);
501 else fix_range(vma->vm_mm, start, end, 0);
502}
503EXPORT_SYMBOL(flush_tlb_range);
504
505void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
506 unsigned long end)
507{
508 /*
509 * Don't bother flushing if this address space is about to be
510 * destroyed.
511 */
512 if (atomic_read(&mm->mm_users) == 0)
513 return;
514
515 fix_range(mm, start, end, 0);
516}
517
518void flush_tlb_mm(struct mm_struct *mm)
519{
520 struct vm_area_struct *vma = mm->mmap;
521
522 while (vma != NULL) {
523 fix_range(mm, vma->vm_start, vma->vm_end, 0);
524 vma = vma->vm_next;
525 }
526}
527
528void force_flush_all(void)
529{
530 struct mm_struct *mm = current->mm;
531 struct vm_area_struct *vma = mm->mmap;
532
533 while (vma != NULL) {
534 fix_range(mm, vma->vm_start, vma->vm_end, 1);
535 vma = vma->vm_next;
536 }
537}
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/mm.h>
7#include <linux/sched.h>
8#include <asm/pgtable.h>
9#include <asm/tlbflush.h>
10#include "as-layout.h"
11#include "mem_user.h"
12#include "os.h"
13#include "skas.h"
14#include "tlb.h"
15
16struct host_vm_change {
17 struct host_vm_op {
18 enum { NONE, MMAP, MUNMAP, MPROTECT } type;
19 union {
20 struct {
21 unsigned long addr;
22 unsigned long len;
23 unsigned int prot;
24 int fd;
25 __u64 offset;
26 } mmap;
27 struct {
28 unsigned long addr;
29 unsigned long len;
30 } munmap;
31 struct {
32 unsigned long addr;
33 unsigned long len;
34 unsigned int prot;
35 } mprotect;
36 } u;
37 } ops[1];
38 int index;
39 struct mm_id *id;
40 void *data;
41 int force;
42};
43
44#define INIT_HVC(mm, force) \
45 ((struct host_vm_change) \
46 { .ops = { { .type = NONE } }, \
47 .id = &mm->context.id, \
48 .data = NULL, \
49 .index = 0, \
50 .force = force })
51
52static int do_ops(struct host_vm_change *hvc, int end,
53 int finished)
54{
55 struct host_vm_op *op;
56 int i, ret = 0;
57
58 for (i = 0; i < end && !ret; i++) {
59 op = &hvc->ops[i];
60 switch (op->type) {
61 case MMAP:
62 ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
63 op->u.mmap.prot, op->u.mmap.fd,
64 op->u.mmap.offset, finished, &hvc->data);
65 break;
66 case MUNMAP:
67 ret = unmap(hvc->id, op->u.munmap.addr,
68 op->u.munmap.len, finished, &hvc->data);
69 break;
70 case MPROTECT:
71 ret = protect(hvc->id, op->u.mprotect.addr,
72 op->u.mprotect.len, op->u.mprotect.prot,
73 finished, &hvc->data);
74 break;
75 default:
76 printk(KERN_ERR "Unknown op type %d in do_ops\n",
77 op->type);
78 break;
79 }
80 }
81
82 return ret;
83}
84
85static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
86 unsigned int prot, struct host_vm_change *hvc)
87{
88 __u64 offset;
89 struct host_vm_op *last;
90 int fd, ret = 0;
91
92 fd = phys_mapping(phys, &offset);
93 if (hvc->index != 0) {
94 last = &hvc->ops[hvc->index - 1];
95 if ((last->type == MMAP) &&
96 (last->u.mmap.addr + last->u.mmap.len == virt) &&
97 (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
98 (last->u.mmap.offset + last->u.mmap.len == offset)) {
99 last->u.mmap.len += len;
100 return 0;
101 }
102 }
103
104 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
105 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
106 hvc->index = 0;
107 }
108
109 hvc->ops[hvc->index++] = ((struct host_vm_op)
110 { .type = MMAP,
111 .u = { .mmap = { .addr = virt,
112 .len = len,
113 .prot = prot,
114 .fd = fd,
115 .offset = offset }
116 } });
117 return ret;
118}
119
120static int add_munmap(unsigned long addr, unsigned long len,
121 struct host_vm_change *hvc)
122{
123 struct host_vm_op *last;
124 int ret = 0;
125
126 if (hvc->index != 0) {
127 last = &hvc->ops[hvc->index - 1];
128 if ((last->type == MUNMAP) &&
129 (last->u.munmap.addr + last->u.mmap.len == addr)) {
130 last->u.munmap.len += len;
131 return 0;
132 }
133 }
134
135 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
136 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
137 hvc->index = 0;
138 }
139
140 hvc->ops[hvc->index++] = ((struct host_vm_op)
141 { .type = MUNMAP,
142 .u = { .munmap = { .addr = addr,
143 .len = len } } });
144 return ret;
145}
146
147static int add_mprotect(unsigned long addr, unsigned long len,
148 unsigned int prot, struct host_vm_change *hvc)
149{
150 struct host_vm_op *last;
151 int ret = 0;
152
153 if (hvc->index != 0) {
154 last = &hvc->ops[hvc->index - 1];
155 if ((last->type == MPROTECT) &&
156 (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
157 (last->u.mprotect.prot == prot)) {
158 last->u.mprotect.len += len;
159 return 0;
160 }
161 }
162
163 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
164 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
165 hvc->index = 0;
166 }
167
168 hvc->ops[hvc->index++] = ((struct host_vm_op)
169 { .type = MPROTECT,
170 .u = { .mprotect = { .addr = addr,
171 .len = len,
172 .prot = prot } } });
173 return ret;
174}
175
176#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
177
178static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
179 unsigned long end,
180 struct host_vm_change *hvc)
181{
182 pte_t *pte;
183 int r, w, x, prot, ret = 0;
184
185 pte = pte_offset_kernel(pmd, addr);
186 do {
187 if ((addr >= STUB_START) && (addr < STUB_END))
188 continue;
189
190 r = pte_read(*pte);
191 w = pte_write(*pte);
192 x = pte_exec(*pte);
193 if (!pte_young(*pte)) {
194 r = 0;
195 w = 0;
196 } else if (!pte_dirty(*pte))
197 w = 0;
198
199 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
200 (x ? UM_PROT_EXEC : 0));
201 if (hvc->force || pte_newpage(*pte)) {
202 if (pte_present(*pte))
203 ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
204 PAGE_SIZE, prot, hvc);
205 else
206 ret = add_munmap(addr, PAGE_SIZE, hvc);
207 } else if (pte_newprot(*pte))
208 ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
209 *pte = pte_mkuptodate(*pte);
210 } while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
211 return ret;
212}
213
214static inline int update_pmd_range(pud_t *pud, unsigned long addr,
215 unsigned long end,
216 struct host_vm_change *hvc)
217{
218 pmd_t *pmd;
219 unsigned long next;
220 int ret = 0;
221
222 pmd = pmd_offset(pud, addr);
223 do {
224 next = pmd_addr_end(addr, end);
225 if (!pmd_present(*pmd)) {
226 if (hvc->force || pmd_newpage(*pmd)) {
227 ret = add_munmap(addr, next - addr, hvc);
228 pmd_mkuptodate(*pmd);
229 }
230 }
231 else ret = update_pte_range(pmd, addr, next, hvc);
232 } while (pmd++, addr = next, ((addr < end) && !ret));
233 return ret;
234}
235
236static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
237 unsigned long end,
238 struct host_vm_change *hvc)
239{
240 pud_t *pud;
241 unsigned long next;
242 int ret = 0;
243
244 pud = pud_offset(pgd, addr);
245 do {
246 next = pud_addr_end(addr, end);
247 if (!pud_present(*pud)) {
248 if (hvc->force || pud_newpage(*pud)) {
249 ret = add_munmap(addr, next - addr, hvc);
250 pud_mkuptodate(*pud);
251 }
252 }
253 else ret = update_pmd_range(pud, addr, next, hvc);
254 } while (pud++, addr = next, ((addr < end) && !ret));
255 return ret;
256}
257
258void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
259 unsigned long end_addr, int force)
260{
261 pgd_t *pgd;
262 struct host_vm_change hvc;
263 unsigned long addr = start_addr, next;
264 int ret = 0;
265
266 hvc = INIT_HVC(mm, force);
267 pgd = pgd_offset(mm, addr);
268 do {
269 next = pgd_addr_end(addr, end_addr);
270 if (!pgd_present(*pgd)) {
271 if (force || pgd_newpage(*pgd)) {
272 ret = add_munmap(addr, next - addr, &hvc);
273 pgd_mkuptodate(*pgd);
274 }
275 }
276 else ret = update_pud_range(pgd, addr, next, &hvc);
277 } while (pgd++, addr = next, ((addr < end_addr) && !ret));
278
279 if (!ret)
280 ret = do_ops(&hvc, hvc.index, 1);
281
282 /* This is not an else because ret is modified above */
283 if (ret) {
284 printk(KERN_ERR "fix_range_common: failed, killing current "
285 "process\n");
286 force_sig(SIGKILL, current);
287 }
288}
289
290int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
291{
292 struct mm_struct *mm;
293 pgd_t *pgd;
294 pud_t *pud;
295 pmd_t *pmd;
296 pte_t *pte;
297 unsigned long addr, last;
298 int updated = 0, err;
299
300 mm = &init_mm;
301 for (addr = start; addr < end;) {
302 pgd = pgd_offset(mm, addr);
303 if (!pgd_present(*pgd)) {
304 last = ADD_ROUND(addr, PGDIR_SIZE);
305 if (last > end)
306 last = end;
307 if (pgd_newpage(*pgd)) {
308 updated = 1;
309 err = os_unmap_memory((void *) addr,
310 last - addr);
311 if (err < 0)
312 panic("munmap failed, errno = %d\n",
313 -err);
314 }
315 addr = last;
316 continue;
317 }
318
319 pud = pud_offset(pgd, addr);
320 if (!pud_present(*pud)) {
321 last = ADD_ROUND(addr, PUD_SIZE);
322 if (last > end)
323 last = end;
324 if (pud_newpage(*pud)) {
325 updated = 1;
326 err = os_unmap_memory((void *) addr,
327 last - addr);
328 if (err < 0)
329 panic("munmap failed, errno = %d\n",
330 -err);
331 }
332 addr = last;
333 continue;
334 }
335
336 pmd = pmd_offset(pud, addr);
337 if (!pmd_present(*pmd)) {
338 last = ADD_ROUND(addr, PMD_SIZE);
339 if (last > end)
340 last = end;
341 if (pmd_newpage(*pmd)) {
342 updated = 1;
343 err = os_unmap_memory((void *) addr,
344 last - addr);
345 if (err < 0)
346 panic("munmap failed, errno = %d\n",
347 -err);
348 }
349 addr = last;
350 continue;
351 }
352
353 pte = pte_offset_kernel(pmd, addr);
354 if (!pte_present(*pte) || pte_newpage(*pte)) {
355 updated = 1;
356 err = os_unmap_memory((void *) addr,
357 PAGE_SIZE);
358 if (err < 0)
359 panic("munmap failed, errno = %d\n",
360 -err);
361 if (pte_present(*pte))
362 map_memory(addr,
363 pte_val(*pte) & PAGE_MASK,
364 PAGE_SIZE, 1, 1, 1);
365 }
366 else if (pte_newprot(*pte)) {
367 updated = 1;
368 os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
369 }
370 addr += PAGE_SIZE;
371 }
372 return updated;
373}
374
375void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
376{
377 pgd_t *pgd;
378 pud_t *pud;
379 pmd_t *pmd;
380 pte_t *pte;
381 struct mm_struct *mm = vma->vm_mm;
382 void *flush = NULL;
383 int r, w, x, prot, err = 0;
384 struct mm_id *mm_id;
385
386 address &= PAGE_MASK;
387 pgd = pgd_offset(mm, address);
388 if (!pgd_present(*pgd))
389 goto kill;
390
391 pud = pud_offset(pgd, address);
392 if (!pud_present(*pud))
393 goto kill;
394
395 pmd = pmd_offset(pud, address);
396 if (!pmd_present(*pmd))
397 goto kill;
398
399 pte = pte_offset_kernel(pmd, address);
400
401 r = pte_read(*pte);
402 w = pte_write(*pte);
403 x = pte_exec(*pte);
404 if (!pte_young(*pte)) {
405 r = 0;
406 w = 0;
407 } else if (!pte_dirty(*pte)) {
408 w = 0;
409 }
410
411 mm_id = &mm->context.id;
412 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
413 (x ? UM_PROT_EXEC : 0));
414 if (pte_newpage(*pte)) {
415 if (pte_present(*pte)) {
416 unsigned long long offset;
417 int fd;
418
419 fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
420 err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
421 1, &flush);
422 }
423 else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
424 }
425 else if (pte_newprot(*pte))
426 err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
427
428 if (err)
429 goto kill;
430
431 *pte = pte_mkuptodate(*pte);
432
433 return;
434
435kill:
436 printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
437 force_sig(SIGKILL, current);
438}
439
440pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
441{
442 return pgd_offset(mm, address);
443}
444
445pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
446{
447 return pud_offset(pgd, address);
448}
449
450pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
451{
452 return pmd_offset(pud, address);
453}
454
455pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
456{
457 return pte_offset_kernel(pmd, address);
458}
459
460pte_t *addr_pte(struct task_struct *task, unsigned long addr)
461{
462 pgd_t *pgd = pgd_offset(task->mm, addr);
463 pud_t *pud = pud_offset(pgd, addr);
464 pmd_t *pmd = pmd_offset(pud, addr);
465
466 return pte_offset_map(pmd, addr);
467}
468
469void flush_tlb_all(void)
470{
471 flush_tlb_mm(current->mm);
472}
473
474void flush_tlb_kernel_range(unsigned long start, unsigned long end)
475{
476 flush_tlb_kernel_range_common(start, end);
477}
478
479void flush_tlb_kernel_vm(void)
480{
481 flush_tlb_kernel_range_common(start_vm, end_vm);
482}
483
484void __flush_tlb_one(unsigned long addr)
485{
486 flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
487}
488
489static void fix_range(struct mm_struct *mm, unsigned long start_addr,
490 unsigned long end_addr, int force)
491{
492 fix_range_common(mm, start_addr, end_addr, force);
493}
494
495void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
496 unsigned long end)
497{
498 if (vma->vm_mm == NULL)
499 flush_tlb_kernel_range_common(start, end);
500 else fix_range(vma->vm_mm, start, end, 0);
501}
502
503void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
504 unsigned long end)
505{
506 /*
507 * Don't bother flushing if this address space is about to be
508 * destroyed.
509 */
510 if (atomic_read(&mm->mm_users) == 0)
511 return;
512
513 fix_range(mm, start, end, 0);
514}
515
516void flush_tlb_mm(struct mm_struct *mm)
517{
518 struct vm_area_struct *vma = mm->mmap;
519
520 while (vma != NULL) {
521 fix_range(mm, vma->vm_start, vma->vm_end, 0);
522 vma = vma->vm_next;
523 }
524}
525
526void force_flush_all(void)
527{
528 struct mm_struct *mm = current->mm;
529 struct vm_area_struct *vma = mm->mmap;
530
531 while (vma != NULL) {
532 fix_range(mm, vma->vm_start, vma->vm_end, 1);
533 vma = vma->vm_next;
534 }
535}