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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/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#include <kern_util.h>
16
17struct host_vm_change {
18 struct host_vm_op {
19 enum { NONE, MMAP, MUNMAP, MPROTECT } type;
20 union {
21 struct {
22 unsigned long addr;
23 unsigned long len;
24 unsigned int prot;
25 int fd;
26 __u64 offset;
27 } mmap;
28 struct {
29 unsigned long addr;
30 unsigned long len;
31 } munmap;
32 struct {
33 unsigned long addr;
34 unsigned long len;
35 unsigned int prot;
36 } mprotect;
37 } u;
38 } ops[1];
39 int index;
40 struct mm_id *id;
41 void *data;
42 int force;
43};
44
45#define INIT_HVC(mm, force) \
46 ((struct host_vm_change) \
47 { .ops = { { .type = NONE } }, \
48 .id = &mm->context.id, \
49 .data = NULL, \
50 .index = 0, \
51 .force = force })
52
53static void report_enomem(void)
54{
55 printk(KERN_ERR "UML ran out of memory on the host side! "
56 "This can happen due to a memory limitation or "
57 "vm.max_map_count has been reached.\n");
58}
59
60static int do_ops(struct host_vm_change *hvc, int end,
61 int finished)
62{
63 struct host_vm_op *op;
64 int i, ret = 0;
65
66 for (i = 0; i < end && !ret; i++) {
67 op = &hvc->ops[i];
68 switch (op->type) {
69 case MMAP:
70 ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
71 op->u.mmap.prot, op->u.mmap.fd,
72 op->u.mmap.offset, finished, &hvc->data);
73 break;
74 case MUNMAP:
75 ret = unmap(hvc->id, op->u.munmap.addr,
76 op->u.munmap.len, finished, &hvc->data);
77 break;
78 case MPROTECT:
79 ret = protect(hvc->id, op->u.mprotect.addr,
80 op->u.mprotect.len, op->u.mprotect.prot,
81 finished, &hvc->data);
82 break;
83 default:
84 printk(KERN_ERR "Unknown op type %d in do_ops\n",
85 op->type);
86 BUG();
87 break;
88 }
89 }
90
91 if (ret == -ENOMEM)
92 report_enomem();
93
94 return ret;
95}
96
97static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
98 unsigned int prot, struct host_vm_change *hvc)
99{
100 __u64 offset;
101 struct host_vm_op *last;
102 int fd, ret = 0;
103
104 fd = phys_mapping(phys, &offset);
105 if (hvc->index != 0) {
106 last = &hvc->ops[hvc->index - 1];
107 if ((last->type == MMAP) &&
108 (last->u.mmap.addr + last->u.mmap.len == virt) &&
109 (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
110 (last->u.mmap.offset + last->u.mmap.len == offset)) {
111 last->u.mmap.len += len;
112 return 0;
113 }
114 }
115
116 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
117 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
118 hvc->index = 0;
119 }
120
121 hvc->ops[hvc->index++] = ((struct host_vm_op)
122 { .type = MMAP,
123 .u = { .mmap = { .addr = virt,
124 .len = len,
125 .prot = prot,
126 .fd = fd,
127 .offset = offset }
128 } });
129 return ret;
130}
131
132static int add_munmap(unsigned long addr, unsigned long len,
133 struct host_vm_change *hvc)
134{
135 struct host_vm_op *last;
136 int ret = 0;
137
138 if ((addr >= STUB_START) && (addr < STUB_END))
139 return -EINVAL;
140
141 if (hvc->index != 0) {
142 last = &hvc->ops[hvc->index - 1];
143 if ((last->type == MUNMAP) &&
144 (last->u.munmap.addr + last->u.mmap.len == addr)) {
145 last->u.munmap.len += len;
146 return 0;
147 }
148 }
149
150 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
151 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
152 hvc->index = 0;
153 }
154
155 hvc->ops[hvc->index++] = ((struct host_vm_op)
156 { .type = MUNMAP,
157 .u = { .munmap = { .addr = addr,
158 .len = len } } });
159 return ret;
160}
161
162static int add_mprotect(unsigned long addr, unsigned long len,
163 unsigned int prot, struct host_vm_change *hvc)
164{
165 struct host_vm_op *last;
166 int ret = 0;
167
168 if (hvc->index != 0) {
169 last = &hvc->ops[hvc->index - 1];
170 if ((last->type == MPROTECT) &&
171 (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
172 (last->u.mprotect.prot == prot)) {
173 last->u.mprotect.len += len;
174 return 0;
175 }
176 }
177
178 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
179 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
180 hvc->index = 0;
181 }
182
183 hvc->ops[hvc->index++] = ((struct host_vm_op)
184 { .type = MPROTECT,
185 .u = { .mprotect = { .addr = addr,
186 .len = len,
187 .prot = prot } } });
188 return ret;
189}
190
191#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
192
193static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
194 unsigned long end,
195 struct host_vm_change *hvc)
196{
197 pte_t *pte;
198 int r, w, x, prot, ret = 0;
199
200 pte = pte_offset_kernel(pmd, addr);
201 do {
202 if ((addr >= STUB_START) && (addr < STUB_END))
203 continue;
204
205 r = pte_read(*pte);
206 w = pte_write(*pte);
207 x = pte_exec(*pte);
208 if (!pte_young(*pte)) {
209 r = 0;
210 w = 0;
211 } else if (!pte_dirty(*pte))
212 w = 0;
213
214 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
215 (x ? UM_PROT_EXEC : 0));
216 if (hvc->force || pte_newpage(*pte)) {
217 if (pte_present(*pte))
218 ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
219 PAGE_SIZE, prot, hvc);
220 else
221 ret = add_munmap(addr, PAGE_SIZE, hvc);
222 } else if (pte_newprot(*pte))
223 ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
224 *pte = pte_mkuptodate(*pte);
225 } while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
226 return ret;
227}
228
229static inline int update_pmd_range(pud_t *pud, unsigned long addr,
230 unsigned long end,
231 struct host_vm_change *hvc)
232{
233 pmd_t *pmd;
234 unsigned long next;
235 int ret = 0;
236
237 pmd = pmd_offset(pud, addr);
238 do {
239 next = pmd_addr_end(addr, end);
240 if (!pmd_present(*pmd)) {
241 if (hvc->force || pmd_newpage(*pmd)) {
242 ret = add_munmap(addr, next - addr, hvc);
243 pmd_mkuptodate(*pmd);
244 }
245 }
246 else ret = update_pte_range(pmd, addr, next, hvc);
247 } while (pmd++, addr = next, ((addr < end) && !ret));
248 return ret;
249}
250
251static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
252 unsigned long end,
253 struct host_vm_change *hvc)
254{
255 pud_t *pud;
256 unsigned long next;
257 int ret = 0;
258
259 pud = pud_offset(pgd, addr);
260 do {
261 next = pud_addr_end(addr, end);
262 if (!pud_present(*pud)) {
263 if (hvc->force || pud_newpage(*pud)) {
264 ret = add_munmap(addr, next - addr, hvc);
265 pud_mkuptodate(*pud);
266 }
267 }
268 else ret = update_pmd_range(pud, addr, next, hvc);
269 } while (pud++, addr = next, ((addr < end) && !ret));
270 return ret;
271}
272
273void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
274 unsigned long end_addr, int force)
275{
276 pgd_t *pgd;
277 struct host_vm_change hvc;
278 unsigned long addr = start_addr, next;
279 int ret = 0;
280
281 hvc = INIT_HVC(mm, force);
282 pgd = pgd_offset(mm, addr);
283 do {
284 next = pgd_addr_end(addr, end_addr);
285 if (!pgd_present(*pgd)) {
286 if (force || pgd_newpage(*pgd)) {
287 ret = add_munmap(addr, next - addr, &hvc);
288 pgd_mkuptodate(*pgd);
289 }
290 }
291 else ret = update_pud_range(pgd, addr, next, &hvc);
292 } while (pgd++, addr = next, ((addr < end_addr) && !ret));
293
294 if (!ret)
295 ret = do_ops(&hvc, hvc.index, 1);
296
297 /* This is not an else because ret is modified above */
298 if (ret) {
299 printk(KERN_ERR "fix_range_common: failed, killing current "
300 "process: %d\n", task_tgid_vnr(current));
301 /* We are under mmap_sem, release it such that current can terminate */
302 up_write(¤t->mm->mmap_sem);
303 force_sig(SIGKILL, current);
304 do_signal(¤t->thread.regs);
305 }
306}
307
308static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
309{
310 struct mm_struct *mm;
311 pgd_t *pgd;
312 pud_t *pud;
313 pmd_t *pmd;
314 pte_t *pte;
315 unsigned long addr, last;
316 int updated = 0, err;
317
318 mm = &init_mm;
319 for (addr = start; addr < end;) {
320 pgd = pgd_offset(mm, addr);
321 if (!pgd_present(*pgd)) {
322 last = ADD_ROUND(addr, PGDIR_SIZE);
323 if (last > end)
324 last = end;
325 if (pgd_newpage(*pgd)) {
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 pud = pud_offset(pgd, addr);
338 if (!pud_present(*pud)) {
339 last = ADD_ROUND(addr, PUD_SIZE);
340 if (last > end)
341 last = end;
342 if (pud_newpage(*pud)) {
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 pmd = pmd_offset(pud, addr);
355 if (!pmd_present(*pmd)) {
356 last = ADD_ROUND(addr, PMD_SIZE);
357 if (last > end)
358 last = end;
359 if (pmd_newpage(*pmd)) {
360 updated = 1;
361 err = os_unmap_memory((void *) addr,
362 last - addr);
363 if (err < 0)
364 panic("munmap failed, errno = %d\n",
365 -err);
366 }
367 addr = last;
368 continue;
369 }
370
371 pte = pte_offset_kernel(pmd, addr);
372 if (!pte_present(*pte) || pte_newpage(*pte)) {
373 updated = 1;
374 err = os_unmap_memory((void *) addr,
375 PAGE_SIZE);
376 if (err < 0)
377 panic("munmap failed, errno = %d\n",
378 -err);
379 if (pte_present(*pte))
380 map_memory(addr,
381 pte_val(*pte) & PAGE_MASK,
382 PAGE_SIZE, 1, 1, 1);
383 }
384 else if (pte_newprot(*pte)) {
385 updated = 1;
386 os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
387 }
388 addr += PAGE_SIZE;
389 }
390 return updated;
391}
392
393void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
394{
395 pgd_t *pgd;
396 pud_t *pud;
397 pmd_t *pmd;
398 pte_t *pte;
399 struct mm_struct *mm = vma->vm_mm;
400 void *flush = NULL;
401 int r, w, x, prot, err = 0;
402 struct mm_id *mm_id;
403
404 address &= PAGE_MASK;
405 pgd = pgd_offset(mm, address);
406 if (!pgd_present(*pgd))
407 goto kill;
408
409 pud = pud_offset(pgd, address);
410 if (!pud_present(*pud))
411 goto kill;
412
413 pmd = pmd_offset(pud, address);
414 if (!pmd_present(*pmd))
415 goto kill;
416
417 pte = pte_offset_kernel(pmd, address);
418
419 r = pte_read(*pte);
420 w = pte_write(*pte);
421 x = pte_exec(*pte);
422 if (!pte_young(*pte)) {
423 r = 0;
424 w = 0;
425 } else if (!pte_dirty(*pte)) {
426 w = 0;
427 }
428
429 mm_id = &mm->context.id;
430 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
431 (x ? UM_PROT_EXEC : 0));
432 if (pte_newpage(*pte)) {
433 if (pte_present(*pte)) {
434 unsigned long long offset;
435 int fd;
436
437 fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
438 err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
439 1, &flush);
440 }
441 else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
442 }
443 else if (pte_newprot(*pte))
444 err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
445
446 if (err) {
447 if (err == -ENOMEM)
448 report_enomem();
449
450 goto kill;
451 }
452
453 *pte = pte_mkuptodate(*pte);
454
455 return;
456
457kill:
458 printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
459 force_sig(SIGKILL, current);
460}
461
462pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
463{
464 return pgd_offset(mm, address);
465}
466
467pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
468{
469 return pud_offset(pgd, address);
470}
471
472pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
473{
474 return pmd_offset(pud, address);
475}
476
477pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
478{
479 return pte_offset_kernel(pmd, address);
480}
481
482pte_t *addr_pte(struct task_struct *task, unsigned long addr)
483{
484 pgd_t *pgd = pgd_offset(task->mm, addr);
485 pud_t *pud = pud_offset(pgd, addr);
486 pmd_t *pmd = pmd_offset(pud, addr);
487
488 return pte_offset_map(pmd, addr);
489}
490
491void flush_tlb_all(void)
492{
493 flush_tlb_mm(current->mm);
494}
495
496void flush_tlb_kernel_range(unsigned long start, unsigned long end)
497{
498 flush_tlb_kernel_range_common(start, end);
499}
500
501void flush_tlb_kernel_vm(void)
502{
503 flush_tlb_kernel_range_common(start_vm, end_vm);
504}
505
506void __flush_tlb_one(unsigned long addr)
507{
508 flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
509}
510
511static void fix_range(struct mm_struct *mm, unsigned long start_addr,
512 unsigned long end_addr, int force)
513{
514 fix_range_common(mm, start_addr, end_addr, force);
515}
516
517void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
518 unsigned long end)
519{
520 if (vma->vm_mm == NULL)
521 flush_tlb_kernel_range_common(start, end);
522 else fix_range(vma->vm_mm, start, end, 0);
523}
524EXPORT_SYMBOL(flush_tlb_range);
525
526void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
527 unsigned long end)
528{
529 /*
530 * Don't bother flushing if this address space is about to be
531 * destroyed.
532 */
533 if (atomic_read(&mm->mm_users) == 0)
534 return;
535
536 fix_range(mm, start, end, 0);
537}
538
539void flush_tlb_mm(struct mm_struct *mm)
540{
541 struct vm_area_struct *vma = mm->mmap;
542
543 while (vma != NULL) {
544 fix_range(mm, vma->vm_start, vma->vm_end, 0);
545 vma = vma->vm_next;
546 }
547}
548
549void force_flush_all(void)
550{
551 struct mm_struct *mm = current->mm;
552 struct vm_area_struct *vma = mm->mmap;
553
554 while (vma != NULL) {
555 fix_range(mm, vma->vm_start, vma->vm_end, 1);
556 vma = vma->vm_next;
557 }
558}