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
16 struct 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
do_ops(struct host_vm_change * hvc,int end,int finished)52 static 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
add_mmap(unsigned long virt,unsigned long phys,unsigned long len,unsigned int prot,struct host_vm_change * hvc)85 static 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
add_munmap(unsigned long addr,unsigned long len,struct host_vm_change * hvc)120 static 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
add_mprotect(unsigned long addr,unsigned long len,unsigned int prot,struct host_vm_change * hvc)147 static 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
update_pte_range(pmd_t * pmd,unsigned long addr,unsigned long end,struct host_vm_change * hvc)178 static 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
update_pmd_range(pud_t * pud,unsigned long addr,unsigned long end,struct host_vm_change * hvc)214 static 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
update_pud_range(pgd_t * pgd,unsigned long addr,unsigned long end,struct host_vm_change * hvc)236 static 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
fix_range_common(struct mm_struct * mm,unsigned long start_addr,unsigned long end_addr,int force)258 void 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
flush_tlb_kernel_range_common(unsigned long start,unsigned long end)290 static int 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
flush_tlb_page(struct vm_area_struct * vma,unsigned long address)375 void 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
435 kill:
436 printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
437 force_sig(SIGKILL, current);
438 }
439
pgd_offset_proc(struct mm_struct * mm,unsigned long address)440 pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
441 {
442 return pgd_offset(mm, address);
443 }
444
pud_offset_proc(pgd_t * pgd,unsigned long address)445 pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
446 {
447 return pud_offset(pgd, address);
448 }
449
pmd_offset_proc(pud_t * pud,unsigned long address)450 pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
451 {
452 return pmd_offset(pud, address);
453 }
454
pte_offset_proc(pmd_t * pmd,unsigned long address)455 pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
456 {
457 return pte_offset_kernel(pmd, address);
458 }
459
addr_pte(struct task_struct * task,unsigned long addr)460 pte_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
flush_tlb_all(void)469 void flush_tlb_all(void)
470 {
471 flush_tlb_mm(current->mm);
472 }
473
flush_tlb_kernel_range(unsigned long start,unsigned long end)474 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
475 {
476 flush_tlb_kernel_range_common(start, end);
477 }
478
flush_tlb_kernel_vm(void)479 void flush_tlb_kernel_vm(void)
480 {
481 flush_tlb_kernel_range_common(start_vm, end_vm);
482 }
483
__flush_tlb_one(unsigned long addr)484 void __flush_tlb_one(unsigned long addr)
485 {
486 flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
487 }
488
fix_range(struct mm_struct * mm,unsigned long start_addr,unsigned long end_addr,int force)489 static 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
flush_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)495 void 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 EXPORT_SYMBOL(flush_tlb_range);
503
flush_tlb_mm_range(struct mm_struct * mm,unsigned long start,unsigned long end)504 void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
505 unsigned long end)
506 {
507 /*
508 * Don't bother flushing if this address space is about to be
509 * destroyed.
510 */
511 if (atomic_read(&mm->mm_users) == 0)
512 return;
513
514 fix_range(mm, start, end, 0);
515 }
516
flush_tlb_mm(struct mm_struct * mm)517 void flush_tlb_mm(struct mm_struct *mm)
518 {
519 struct vm_area_struct *vma = mm->mmap;
520
521 while (vma != NULL) {
522 fix_range(mm, vma->vm_start, vma->vm_end, 0);
523 vma = vma->vm_next;
524 }
525 }
526
force_flush_all(void)527 void force_flush_all(void)
528 {
529 struct mm_struct *mm = current->mm;
530 struct vm_area_struct *vma = mm->mmap;
531
532 while (vma != NULL) {
533 fix_range(mm, vma->vm_start, vma->vm_end, 1);
534 vma = vma->vm_next;
535 }
536 }
537