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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 int do_ops(struct host_vm_change *hvc, int end,
54 int finished)
55{
56 struct host_vm_op *op;
57 int i, ret = 0;
58
59 for (i = 0; i < end && !ret; i++) {
60 op = &hvc->ops[i];
61 switch (op->type) {
62 case MMAP:
63 ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
64 op->u.mmap.prot, op->u.mmap.fd,
65 op->u.mmap.offset, finished, &hvc->data);
66 break;
67 case MUNMAP:
68 ret = unmap(hvc->id, op->u.munmap.addr,
69 op->u.munmap.len, finished, &hvc->data);
70 break;
71 case MPROTECT:
72 ret = protect(hvc->id, op->u.mprotect.addr,
73 op->u.mprotect.len, op->u.mprotect.prot,
74 finished, &hvc->data);
75 break;
76 default:
77 printk(KERN_ERR "Unknown op type %d in do_ops\n",
78 op->type);
79 BUG();
80 break;
81 }
82 }
83
84 return ret;
85}
86
87static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
88 unsigned int prot, struct host_vm_change *hvc)
89{
90 __u64 offset;
91 struct host_vm_op *last;
92 int fd, ret = 0;
93
94 fd = phys_mapping(phys, &offset);
95 if (hvc->index != 0) {
96 last = &hvc->ops[hvc->index - 1];
97 if ((last->type == MMAP) &&
98 (last->u.mmap.addr + last->u.mmap.len == virt) &&
99 (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
100 (last->u.mmap.offset + last->u.mmap.len == offset)) {
101 last->u.mmap.len += len;
102 return 0;
103 }
104 }
105
106 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
107 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
108 hvc->index = 0;
109 }
110
111 hvc->ops[hvc->index++] = ((struct host_vm_op)
112 { .type = MMAP,
113 .u = { .mmap = { .addr = virt,
114 .len = len,
115 .prot = prot,
116 .fd = fd,
117 .offset = offset }
118 } });
119 return ret;
120}
121
122static int add_munmap(unsigned long addr, unsigned long len,
123 struct host_vm_change *hvc)
124{
125 struct host_vm_op *last;
126 int ret = 0;
127
128 if ((addr >= STUB_START) && (addr < STUB_END))
129 return -EINVAL;
130
131 if (hvc->index != 0) {
132 last = &hvc->ops[hvc->index - 1];
133 if ((last->type == MUNMAP) &&
134 (last->u.munmap.addr + last->u.mmap.len == addr)) {
135 last->u.munmap.len += len;
136 return 0;
137 }
138 }
139
140 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
141 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
142 hvc->index = 0;
143 }
144
145 hvc->ops[hvc->index++] = ((struct host_vm_op)
146 { .type = MUNMAP,
147 .u = { .munmap = { .addr = addr,
148 .len = len } } });
149 return ret;
150}
151
152static int add_mprotect(unsigned long addr, unsigned long len,
153 unsigned int prot, struct host_vm_change *hvc)
154{
155 struct host_vm_op *last;
156 int ret = 0;
157
158 if (hvc->index != 0) {
159 last = &hvc->ops[hvc->index - 1];
160 if ((last->type == MPROTECT) &&
161 (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
162 (last->u.mprotect.prot == prot)) {
163 last->u.mprotect.len += len;
164 return 0;
165 }
166 }
167
168 if (hvc->index == ARRAY_SIZE(hvc->ops)) {
169 ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
170 hvc->index = 0;
171 }
172
173 hvc->ops[hvc->index++] = ((struct host_vm_op)
174 { .type = MPROTECT,
175 .u = { .mprotect = { .addr = addr,
176 .len = len,
177 .prot = prot } } });
178 return ret;
179}
180
181#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
182
183static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
184 unsigned long end,
185 struct host_vm_change *hvc)
186{
187 pte_t *pte;
188 int r, w, x, prot, ret = 0;
189
190 pte = pte_offset_kernel(pmd, addr);
191 do {
192 if ((addr >= STUB_START) && (addr < STUB_END))
193 continue;
194
195 r = pte_read(*pte);
196 w = pte_write(*pte);
197 x = pte_exec(*pte);
198 if (!pte_young(*pte)) {
199 r = 0;
200 w = 0;
201 } else if (!pte_dirty(*pte))
202 w = 0;
203
204 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
205 (x ? UM_PROT_EXEC : 0));
206 if (hvc->force || pte_newpage(*pte)) {
207 if (pte_present(*pte))
208 ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
209 PAGE_SIZE, prot, hvc);
210 else
211 ret = add_munmap(addr, PAGE_SIZE, hvc);
212 } else if (pte_newprot(*pte))
213 ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
214 *pte = pte_mkuptodate(*pte);
215 } while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
216 return ret;
217}
218
219static inline int update_pmd_range(pud_t *pud, unsigned long addr,
220 unsigned long end,
221 struct host_vm_change *hvc)
222{
223 pmd_t *pmd;
224 unsigned long next;
225 int ret = 0;
226
227 pmd = pmd_offset(pud, addr);
228 do {
229 next = pmd_addr_end(addr, end);
230 if (!pmd_present(*pmd)) {
231 if (hvc->force || pmd_newpage(*pmd)) {
232 ret = add_munmap(addr, next - addr, hvc);
233 pmd_mkuptodate(*pmd);
234 }
235 }
236 else ret = update_pte_range(pmd, addr, next, hvc);
237 } while (pmd++, addr = next, ((addr < end) && !ret));
238 return ret;
239}
240
241static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
242 unsigned long end,
243 struct host_vm_change *hvc)
244{
245 pud_t *pud;
246 unsigned long next;
247 int ret = 0;
248
249 pud = pud_offset(pgd, addr);
250 do {
251 next = pud_addr_end(addr, end);
252 if (!pud_present(*pud)) {
253 if (hvc->force || pud_newpage(*pud)) {
254 ret = add_munmap(addr, next - addr, hvc);
255 pud_mkuptodate(*pud);
256 }
257 }
258 else ret = update_pmd_range(pud, addr, next, hvc);
259 } while (pud++, addr = next, ((addr < end) && !ret));
260 return ret;
261}
262
263void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
264 unsigned long end_addr, int force)
265{
266 pgd_t *pgd;
267 struct host_vm_change hvc;
268 unsigned long addr = start_addr, next;
269 int ret = 0;
270
271 hvc = INIT_HVC(mm, force);
272 pgd = pgd_offset(mm, addr);
273 do {
274 next = pgd_addr_end(addr, end_addr);
275 if (!pgd_present(*pgd)) {
276 if (force || pgd_newpage(*pgd)) {
277 ret = add_munmap(addr, next - addr, &hvc);
278 pgd_mkuptodate(*pgd);
279 }
280 }
281 else ret = update_pud_range(pgd, addr, next, &hvc);
282 } while (pgd++, addr = next, ((addr < end_addr) && !ret));
283
284 if (!ret)
285 ret = do_ops(&hvc, hvc.index, 1);
286
287
288 if (ret) {
289 printk(KERN_ERR "fix_range_common: failed, killing current "
290 "process: %d\n", task_tgid_vnr(current));
291
292 up_write(¤t->mm->mmap_sem);
293 force_sig(SIGKILL, current);
294 do_signal();
295 }
296}
297
298static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
299{
300 struct mm_struct *mm;
301 pgd_t *pgd;
302 pud_t *pud;
303 pmd_t *pmd;
304 pte_t *pte;
305 unsigned long addr, last;
306 int updated = 0, err;
307
308 mm = &init_mm;
309 for (addr = start; addr < end;) {
310 pgd = pgd_offset(mm, addr);
311 if (!pgd_present(*pgd)) {
312 last = ADD_ROUND(addr, PGDIR_SIZE);
313 if (last > end)
314 last = end;
315 if (pgd_newpage(*pgd)) {
316 updated = 1;
317 err = os_unmap_memory((void *) addr,
318 last - addr);
319 if (err < 0)
320 panic("munmap failed, errno = %d\n",
321 -err);
322 }
323 addr = last;
324 continue;
325 }
326
327 pud = pud_offset(pgd, addr);
328 if (!pud_present(*pud)) {
329 last = ADD_ROUND(addr, PUD_SIZE);
330 if (last > end)
331 last = end;
332 if (pud_newpage(*pud)) {
333 updated = 1;
334 err = os_unmap_memory((void *) addr,
335 last - addr);
336 if (err < 0)
337 panic("munmap failed, errno = %d\n",
338 -err);
339 }
340 addr = last;
341 continue;
342 }
343
344 pmd = pmd_offset(pud, addr);
345 if (!pmd_present(*pmd)) {
346 last = ADD_ROUND(addr, PMD_SIZE);
347 if (last > end)
348 last = end;
349 if (pmd_newpage(*pmd)) {
350 updated = 1;
351 err = os_unmap_memory((void *) addr,
352 last - addr);
353 if (err < 0)
354 panic("munmap failed, errno = %d\n",
355 -err);
356 }
357 addr = last;
358 continue;
359 }
360
361 pte = pte_offset_kernel(pmd, addr);
362 if (!pte_present(*pte) || pte_newpage(*pte)) {
363 updated = 1;
364 err = os_unmap_memory((void *) addr,
365 PAGE_SIZE);
366 if (err < 0)
367 panic("munmap failed, errno = %d\n",
368 -err);
369 if (pte_present(*pte))
370 map_memory(addr,
371 pte_val(*pte) & PAGE_MASK,
372 PAGE_SIZE, 1, 1, 1);
373 }
374 else if (pte_newprot(*pte)) {
375 updated = 1;
376 os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
377 }
378 addr += PAGE_SIZE;
379 }
380 return updated;
381}
382
383void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
384{
385 pgd_t *pgd;
386 pud_t *pud;
387 pmd_t *pmd;
388 pte_t *pte;
389 struct mm_struct *mm = vma->vm_mm;
390 void *flush = NULL;
391 int r, w, x, prot, err = 0;
392 struct mm_id *mm_id;
393
394 address &= PAGE_MASK;
395 pgd = pgd_offset(mm, address);
396 if (!pgd_present(*pgd))
397 goto kill;
398
399 pud = pud_offset(pgd, address);
400 if (!pud_present(*pud))
401 goto kill;
402
403 pmd = pmd_offset(pud, address);
404 if (!pmd_present(*pmd))
405 goto kill;
406
407 pte = pte_offset_kernel(pmd, address);
408
409 r = pte_read(*pte);
410 w = pte_write(*pte);
411 x = pte_exec(*pte);
412 if (!pte_young(*pte)) {
413 r = 0;
414 w = 0;
415 } else if (!pte_dirty(*pte)) {
416 w = 0;
417 }
418
419 mm_id = &mm->context.id;
420 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
421 (x ? UM_PROT_EXEC : 0));
422 if (pte_newpage(*pte)) {
423 if (pte_present(*pte)) {
424 unsigned long long offset;
425 int fd;
426
427 fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
428 err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
429 1, &flush);
430 }
431 else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
432 }
433 else if (pte_newprot(*pte))
434 err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
435
436 if (err)
437 goto kill;
438
439 *pte = pte_mkuptodate(*pte);
440
441 return;
442
443kill:
444 printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
445 force_sig(SIGKILL, current);
446}
447
448pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
449{
450 return pgd_offset(mm, address);
451}
452
453pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
454{
455 return pud_offset(pgd, address);
456}
457
458pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
459{
460 return pmd_offset(pud, address);
461}
462
463pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
464{
465 return pte_offset_kernel(pmd, address);
466}
467
468pte_t *addr_pte(struct task_struct *task, unsigned long addr)
469{
470 pgd_t *pgd = pgd_offset(task->mm, addr);
471 pud_t *pud = pud_offset(pgd, addr);
472 pmd_t *pmd = pmd_offset(pud, addr);
473
474 return pte_offset_map(pmd, addr);
475}
476
477void flush_tlb_all(void)
478{
479 flush_tlb_mm(current->mm);
480}
481
482void flush_tlb_kernel_range(unsigned long start, unsigned long end)
483{
484 flush_tlb_kernel_range_common(start, end);
485}
486
487void flush_tlb_kernel_vm(void)
488{
489 flush_tlb_kernel_range_common(start_vm, end_vm);
490}
491
492void __flush_tlb_one(unsigned long addr)
493{
494 flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
495}
496
497static void fix_range(struct mm_struct *mm, unsigned long start_addr,
498 unsigned long end_addr, int force)
499{
500 fix_range_common(mm, start_addr, end_addr, force);
501}
502
503void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
504 unsigned long end)
505{
506 if (vma->vm_mm == NULL)
507 flush_tlb_kernel_range_common(start, end);
508 else fix_range(vma->vm_mm, start, end, 0);
509}
510EXPORT_SYMBOL(flush_tlb_range);
511
512void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
513 unsigned long end)
514{
515
516
517
518
519 if (atomic_read(&mm->mm_users) == 0)
520 return;
521
522 fix_range(mm, start, end, 0);
523}
524
525void flush_tlb_mm(struct mm_struct *mm)
526{
527 struct vm_area_struct *vma = mm->mmap;
528
529 while (vma != NULL) {
530 fix_range(mm, vma->vm_start, vma->vm_end, 0);
531 vma = vma->vm_next;
532 }
533}
534
535void force_flush_all(void)
536{
537 struct mm_struct *mm = current->mm;
538 struct vm_area_struct *vma = mm->mmap;
539
540 while (vma != NULL) {
541 fix_range(mm, vma->vm_start, vma->vm_end, 1);
542 vma = vma->vm_next;
543 }
544}
545
