1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_PGTABLE_H 3 #define _ASM_X86_PGTABLE_H 4 5 #include <linux/mem_encrypt.h> 6 #include <asm/page.h> 7 #include <asm/pgtable_types.h> 8 9 /* 10 * Macro to mark a page protection value as UC- 11 */ 12 #define pgprot_noncached(prot) \ 13 ((boot_cpu_data.x86 > 3) \ 14 ? (__pgprot(pgprot_val(prot) | \ 15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \ 16 : (prot)) 17 18 /* 19 * Macros to add or remove encryption attribute 20 */ 21 #define pgprot_encrypted(prot) __pgprot(__sme_set(pgprot_val(prot))) 22 #define pgprot_decrypted(prot) __pgprot(__sme_clr(pgprot_val(prot))) 23 24 #ifndef __ASSEMBLY__ 25 #include <asm/x86_init.h> 26 27 extern pgd_t early_top_pgt[PTRS_PER_PGD]; 28 int __init __early_make_pgtable(unsigned long address, pmdval_t pmd); 29 30 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd); 31 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user); 32 void ptdump_walk_pgd_level_checkwx(void); 33 34 #ifdef CONFIG_DEBUG_WX 35 #define debug_checkwx() ptdump_walk_pgd_level_checkwx() 36 #else 37 #define debug_checkwx() do { } while (0) 38 #endif 39 40 /* 41 * ZERO_PAGE is a global shared page that is always zero: used 42 * for zero-mapped memory areas etc.. 43 */ 44 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 45 __visible; 46 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 47 48 extern spinlock_t pgd_lock; 49 extern struct list_head pgd_list; 50 51 extern struct mm_struct *pgd_page_get_mm(struct page *page); 52 53 extern pmdval_t early_pmd_flags; 54 55 #ifdef CONFIG_PARAVIRT 56 #include <asm/paravirt.h> 57 #else /* !CONFIG_PARAVIRT */ 58 #define set_pte(ptep, pte) native_set_pte(ptep, pte) 59 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte) 60 61 #define set_pte_atomic(ptep, pte) \ 62 native_set_pte_atomic(ptep, pte) 63 64 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd) 65 66 #ifndef __PAGETABLE_P4D_FOLDED 67 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd) 68 #define pgd_clear(pgd) (pgtable_l5_enabled ? native_pgd_clear(pgd) : 0) 69 #endif 70 71 #ifndef set_p4d 72 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d) 73 #endif 74 75 #ifndef __PAGETABLE_PUD_FOLDED 76 #define p4d_clear(p4d) native_p4d_clear(p4d) 77 #endif 78 79 #ifndef set_pud 80 # define set_pud(pudp, pud) native_set_pud(pudp, pud) 81 #endif 82 83 #ifndef __PAGETABLE_PUD_FOLDED 84 #define pud_clear(pud) native_pud_clear(pud) 85 #endif 86 87 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep) 88 #define pmd_clear(pmd) native_pmd_clear(pmd) 89 90 #define pgd_val(x) native_pgd_val(x) 91 #define __pgd(x) native_make_pgd(x) 92 93 #ifndef __PAGETABLE_P4D_FOLDED 94 #define p4d_val(x) native_p4d_val(x) 95 #define __p4d(x) native_make_p4d(x) 96 #endif 97 98 #ifndef __PAGETABLE_PUD_FOLDED 99 #define pud_val(x) native_pud_val(x) 100 #define __pud(x) native_make_pud(x) 101 #endif 102 103 #ifndef __PAGETABLE_PMD_FOLDED 104 #define pmd_val(x) native_pmd_val(x) 105 #define __pmd(x) native_make_pmd(x) 106 #endif 107 108 #define pte_val(x) native_pte_val(x) 109 #define __pte(x) native_make_pte(x) 110 111 #define arch_end_context_switch(prev) do {} while(0) 112 113 #endif /* CONFIG_PARAVIRT */ 114 115 /* 116 * The following only work if pte_present() is true. 117 * Undefined behaviour if not.. 118 */ 119 static inline int pte_dirty(pte_t pte) 120 { 121 return pte_flags(pte) & _PAGE_DIRTY; 122 } 123 124 125 static inline u32 read_pkru(void) 126 { 127 if (boot_cpu_has(X86_FEATURE_OSPKE)) 128 return __read_pkru(); 129 return 0; 130 } 131 132 static inline void write_pkru(u32 pkru) 133 { 134 if (boot_cpu_has(X86_FEATURE_OSPKE)) 135 __write_pkru(pkru); 136 } 137 138 static inline int pte_young(pte_t pte) 139 { 140 return pte_flags(pte) & _PAGE_ACCESSED; 141 } 142 143 static inline int pmd_dirty(pmd_t pmd) 144 { 145 return pmd_flags(pmd) & _PAGE_DIRTY; 146 } 147 148 static inline int pmd_young(pmd_t pmd) 149 { 150 return pmd_flags(pmd) & _PAGE_ACCESSED; 151 } 152 153 static inline int pud_dirty(pud_t pud) 154 { 155 return pud_flags(pud) & _PAGE_DIRTY; 156 } 157 158 static inline int pud_young(pud_t pud) 159 { 160 return pud_flags(pud) & _PAGE_ACCESSED; 161 } 162 163 static inline int pte_write(pte_t pte) 164 { 165 return pte_flags(pte) & _PAGE_RW; 166 } 167 168 static inline int pte_huge(pte_t pte) 169 { 170 return pte_flags(pte) & _PAGE_PSE; 171 } 172 173 static inline int pte_global(pte_t pte) 174 { 175 return pte_flags(pte) & _PAGE_GLOBAL; 176 } 177 178 static inline int pte_exec(pte_t pte) 179 { 180 return !(pte_flags(pte) & _PAGE_NX); 181 } 182 183 static inline int pte_special(pte_t pte) 184 { 185 return pte_flags(pte) & _PAGE_SPECIAL; 186 } 187 188 static inline unsigned long pte_pfn(pte_t pte) 189 { 190 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT; 191 } 192 193 static inline unsigned long pmd_pfn(pmd_t pmd) 194 { 195 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT; 196 } 197 198 static inline unsigned long pud_pfn(pud_t pud) 199 { 200 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT; 201 } 202 203 static inline unsigned long p4d_pfn(p4d_t p4d) 204 { 205 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT; 206 } 207 208 static inline unsigned long pgd_pfn(pgd_t pgd) 209 { 210 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT; 211 } 212 213 static inline int p4d_large(p4d_t p4d) 214 { 215 /* No 512 GiB pages yet */ 216 return 0; 217 } 218 219 #define pte_page(pte) pfn_to_page(pte_pfn(pte)) 220 221 static inline int pmd_large(pmd_t pte) 222 { 223 return pmd_flags(pte) & _PAGE_PSE; 224 } 225 226 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 227 static inline int pmd_trans_huge(pmd_t pmd) 228 { 229 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE; 230 } 231 232 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD 233 static inline int pud_trans_huge(pud_t pud) 234 { 235 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE; 236 } 237 #endif 238 239 #define has_transparent_hugepage has_transparent_hugepage 240 static inline int has_transparent_hugepage(void) 241 { 242 return boot_cpu_has(X86_FEATURE_PSE); 243 } 244 245 #ifdef __HAVE_ARCH_PTE_DEVMAP 246 static inline int pmd_devmap(pmd_t pmd) 247 { 248 return !!(pmd_val(pmd) & _PAGE_DEVMAP); 249 } 250 251 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD 252 static inline int pud_devmap(pud_t pud) 253 { 254 return !!(pud_val(pud) & _PAGE_DEVMAP); 255 } 256 #else 257 static inline int pud_devmap(pud_t pud) 258 { 259 return 0; 260 } 261 #endif 262 263 static inline int pgd_devmap(pgd_t pgd) 264 { 265 return 0; 266 } 267 #endif 268 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 269 270 static inline pte_t pte_set_flags(pte_t pte, pteval_t set) 271 { 272 pteval_t v = native_pte_val(pte); 273 274 return native_make_pte(v | set); 275 } 276 277 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear) 278 { 279 pteval_t v = native_pte_val(pte); 280 281 return native_make_pte(v & ~clear); 282 } 283 284 static inline pte_t pte_mkclean(pte_t pte) 285 { 286 return pte_clear_flags(pte, _PAGE_DIRTY); 287 } 288 289 static inline pte_t pte_mkold(pte_t pte) 290 { 291 return pte_clear_flags(pte, _PAGE_ACCESSED); 292 } 293 294 static inline pte_t pte_wrprotect(pte_t pte) 295 { 296 return pte_clear_flags(pte, _PAGE_RW); 297 } 298 299 static inline pte_t pte_mkexec(pte_t pte) 300 { 301 return pte_clear_flags(pte, _PAGE_NX); 302 } 303 304 static inline pte_t pte_mkdirty(pte_t pte) 305 { 306 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); 307 } 308 309 static inline pte_t pte_mkyoung(pte_t pte) 310 { 311 return pte_set_flags(pte, _PAGE_ACCESSED); 312 } 313 314 static inline pte_t pte_mkwrite(pte_t pte) 315 { 316 return pte_set_flags(pte, _PAGE_RW); 317 } 318 319 static inline pte_t pte_mkhuge(pte_t pte) 320 { 321 return pte_set_flags(pte, _PAGE_PSE); 322 } 323 324 static inline pte_t pte_clrhuge(pte_t pte) 325 { 326 return pte_clear_flags(pte, _PAGE_PSE); 327 } 328 329 static inline pte_t pte_mkglobal(pte_t pte) 330 { 331 return pte_set_flags(pte, _PAGE_GLOBAL); 332 } 333 334 static inline pte_t pte_clrglobal(pte_t pte) 335 { 336 return pte_clear_flags(pte, _PAGE_GLOBAL); 337 } 338 339 static inline pte_t pte_mkspecial(pte_t pte) 340 { 341 return pte_set_flags(pte, _PAGE_SPECIAL); 342 } 343 344 static inline pte_t pte_mkdevmap(pte_t pte) 345 { 346 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP); 347 } 348 349 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set) 350 { 351 pmdval_t v = native_pmd_val(pmd); 352 353 return native_make_pmd(v | set); 354 } 355 356 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear) 357 { 358 pmdval_t v = native_pmd_val(pmd); 359 360 return native_make_pmd(v & ~clear); 361 } 362 363 static inline pmd_t pmd_mkold(pmd_t pmd) 364 { 365 return pmd_clear_flags(pmd, _PAGE_ACCESSED); 366 } 367 368 static inline pmd_t pmd_mkclean(pmd_t pmd) 369 { 370 return pmd_clear_flags(pmd, _PAGE_DIRTY); 371 } 372 373 static inline pmd_t pmd_wrprotect(pmd_t pmd) 374 { 375 return pmd_clear_flags(pmd, _PAGE_RW); 376 } 377 378 static inline pmd_t pmd_mkdirty(pmd_t pmd) 379 { 380 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); 381 } 382 383 static inline pmd_t pmd_mkdevmap(pmd_t pmd) 384 { 385 return pmd_set_flags(pmd, _PAGE_DEVMAP); 386 } 387 388 static inline pmd_t pmd_mkhuge(pmd_t pmd) 389 { 390 return pmd_set_flags(pmd, _PAGE_PSE); 391 } 392 393 static inline pmd_t pmd_mkyoung(pmd_t pmd) 394 { 395 return pmd_set_flags(pmd, _PAGE_ACCESSED); 396 } 397 398 static inline pmd_t pmd_mkwrite(pmd_t pmd) 399 { 400 return pmd_set_flags(pmd, _PAGE_RW); 401 } 402 403 static inline pmd_t pmd_mknotpresent(pmd_t pmd) 404 { 405 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE); 406 } 407 408 static inline pud_t pud_set_flags(pud_t pud, pudval_t set) 409 { 410 pudval_t v = native_pud_val(pud); 411 412 return native_make_pud(v | set); 413 } 414 415 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear) 416 { 417 pudval_t v = native_pud_val(pud); 418 419 return native_make_pud(v & ~clear); 420 } 421 422 static inline pud_t pud_mkold(pud_t pud) 423 { 424 return pud_clear_flags(pud, _PAGE_ACCESSED); 425 } 426 427 static inline pud_t pud_mkclean(pud_t pud) 428 { 429 return pud_clear_flags(pud, _PAGE_DIRTY); 430 } 431 432 static inline pud_t pud_wrprotect(pud_t pud) 433 { 434 return pud_clear_flags(pud, _PAGE_RW); 435 } 436 437 static inline pud_t pud_mkdirty(pud_t pud) 438 { 439 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); 440 } 441 442 static inline pud_t pud_mkdevmap(pud_t pud) 443 { 444 return pud_set_flags(pud, _PAGE_DEVMAP); 445 } 446 447 static inline pud_t pud_mkhuge(pud_t pud) 448 { 449 return pud_set_flags(pud, _PAGE_PSE); 450 } 451 452 static inline pud_t pud_mkyoung(pud_t pud) 453 { 454 return pud_set_flags(pud, _PAGE_ACCESSED); 455 } 456 457 static inline pud_t pud_mkwrite(pud_t pud) 458 { 459 return pud_set_flags(pud, _PAGE_RW); 460 } 461 462 static inline pud_t pud_mknotpresent(pud_t pud) 463 { 464 return pud_clear_flags(pud, _PAGE_PRESENT | _PAGE_PROTNONE); 465 } 466 467 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 468 static inline int pte_soft_dirty(pte_t pte) 469 { 470 return pte_flags(pte) & _PAGE_SOFT_DIRTY; 471 } 472 473 static inline int pmd_soft_dirty(pmd_t pmd) 474 { 475 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY; 476 } 477 478 static inline int pud_soft_dirty(pud_t pud) 479 { 480 return pud_flags(pud) & _PAGE_SOFT_DIRTY; 481 } 482 483 static inline pte_t pte_mksoft_dirty(pte_t pte) 484 { 485 return pte_set_flags(pte, _PAGE_SOFT_DIRTY); 486 } 487 488 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) 489 { 490 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY); 491 } 492 493 static inline pud_t pud_mksoft_dirty(pud_t pud) 494 { 495 return pud_set_flags(pud, _PAGE_SOFT_DIRTY); 496 } 497 498 static inline pte_t pte_clear_soft_dirty(pte_t pte) 499 { 500 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY); 501 } 502 503 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) 504 { 505 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY); 506 } 507 508 static inline pud_t pud_clear_soft_dirty(pud_t pud) 509 { 510 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY); 511 } 512 513 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 514 515 /* 516 * Mask out unsupported bits in a present pgprot. Non-present pgprots 517 * can use those bits for other purposes, so leave them be. 518 */ 519 static inline pgprotval_t massage_pgprot(pgprot_t pgprot) 520 { 521 pgprotval_t protval = pgprot_val(pgprot); 522 523 if (protval & _PAGE_PRESENT) 524 protval &= __supported_pte_mask; 525 526 return protval; 527 } 528 529 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) 530 { 531 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) | 532 massage_pgprot(pgprot)); 533 } 534 535 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) 536 { 537 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) | 538 massage_pgprot(pgprot)); 539 } 540 541 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot) 542 { 543 return __pud(((phys_addr_t)page_nr << PAGE_SHIFT) | 544 massage_pgprot(pgprot)); 545 } 546 547 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 548 { 549 pteval_t val = pte_val(pte); 550 551 /* 552 * Chop off the NX bit (if present), and add the NX portion of 553 * the newprot (if present): 554 */ 555 val &= _PAGE_CHG_MASK; 556 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK; 557 558 return __pte(val); 559 } 560 561 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 562 { 563 pmdval_t val = pmd_val(pmd); 564 565 val &= _HPAGE_CHG_MASK; 566 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK; 567 568 return __pmd(val); 569 } 570 571 /* mprotect needs to preserve PAT bits when updating vm_page_prot */ 572 #define pgprot_modify pgprot_modify 573 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) 574 { 575 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; 576 pgprotval_t addbits = pgprot_val(newprot); 577 return __pgprot(preservebits | addbits); 578 } 579 580 #define pte_pgprot(x) __pgprot(pte_flags(x)) 581 #define pmd_pgprot(x) __pgprot(pmd_flags(x)) 582 #define pud_pgprot(x) __pgprot(pud_flags(x)) 583 #define p4d_pgprot(x) __pgprot(p4d_flags(x)) 584 585 #define canon_pgprot(p) __pgprot(massage_pgprot(p)) 586 587 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size, 588 enum page_cache_mode pcm, 589 enum page_cache_mode new_pcm) 590 { 591 /* 592 * PAT type is always WB for untracked ranges, so no need to check. 593 */ 594 if (x86_platform.is_untracked_pat_range(paddr, paddr + size)) 595 return 1; 596 597 /* 598 * Certain new memtypes are not allowed with certain 599 * requested memtype: 600 * - request is uncached, return cannot be write-back 601 * - request is write-combine, return cannot be write-back 602 * - request is write-through, return cannot be write-back 603 * - request is write-through, return cannot be write-combine 604 */ 605 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS && 606 new_pcm == _PAGE_CACHE_MODE_WB) || 607 (pcm == _PAGE_CACHE_MODE_WC && 608 new_pcm == _PAGE_CACHE_MODE_WB) || 609 (pcm == _PAGE_CACHE_MODE_WT && 610 new_pcm == _PAGE_CACHE_MODE_WB) || 611 (pcm == _PAGE_CACHE_MODE_WT && 612 new_pcm == _PAGE_CACHE_MODE_WC)) { 613 return 0; 614 } 615 616 return 1; 617 } 618 619 pmd_t *populate_extra_pmd(unsigned long vaddr); 620 pte_t *populate_extra_pte(unsigned long vaddr); 621 #endif /* __ASSEMBLY__ */ 622 623 #ifdef CONFIG_X86_32 624 # include <asm/pgtable_32.h> 625 #else 626 # include <asm/pgtable_64.h> 627 #endif 628 629 #ifndef __ASSEMBLY__ 630 #include <linux/mm_types.h> 631 #include <linux/mmdebug.h> 632 #include <linux/log2.h> 633 #include <asm/fixmap.h> 634 635 static inline int pte_none(pte_t pte) 636 { 637 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK)); 638 } 639 640 #define __HAVE_ARCH_PTE_SAME 641 static inline int pte_same(pte_t a, pte_t b) 642 { 643 return a.pte == b.pte; 644 } 645 646 static inline int pte_present(pte_t a) 647 { 648 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE); 649 } 650 651 #ifdef __HAVE_ARCH_PTE_DEVMAP 652 static inline int pte_devmap(pte_t a) 653 { 654 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP; 655 } 656 #endif 657 658 #define pte_accessible pte_accessible 659 static inline bool pte_accessible(struct mm_struct *mm, pte_t a) 660 { 661 if (pte_flags(a) & _PAGE_PRESENT) 662 return true; 663 664 if ((pte_flags(a) & _PAGE_PROTNONE) && 665 mm_tlb_flush_pending(mm)) 666 return true; 667 668 return false; 669 } 670 671 static inline int pmd_present(pmd_t pmd) 672 { 673 /* 674 * Checking for _PAGE_PSE is needed too because 675 * split_huge_page will temporarily clear the present bit (but 676 * the _PAGE_PSE flag will remain set at all times while the 677 * _PAGE_PRESENT bit is clear). 678 */ 679 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE); 680 } 681 682 #ifdef CONFIG_NUMA_BALANCING 683 /* 684 * These work without NUMA balancing but the kernel does not care. See the 685 * comment in include/asm-generic/pgtable.h 686 */ 687 static inline int pte_protnone(pte_t pte) 688 { 689 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT)) 690 == _PAGE_PROTNONE; 691 } 692 693 static inline int pmd_protnone(pmd_t pmd) 694 { 695 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT)) 696 == _PAGE_PROTNONE; 697 } 698 #endif /* CONFIG_NUMA_BALANCING */ 699 700 static inline int pmd_none(pmd_t pmd) 701 { 702 /* Only check low word on 32-bit platforms, since it might be 703 out of sync with upper half. */ 704 unsigned long val = native_pmd_val(pmd); 705 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0; 706 } 707 708 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 709 { 710 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd)); 711 } 712 713 /* 714 * Currently stuck as a macro due to indirect forward reference to 715 * linux/mmzone.h's __section_mem_map_addr() definition: 716 */ 717 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd)) 718 719 /* 720 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] 721 * 722 * this macro returns the index of the entry in the pmd page which would 723 * control the given virtual address 724 */ 725 static inline unsigned long pmd_index(unsigned long address) 726 { 727 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); 728 } 729 730 /* 731 * Conversion functions: convert a page and protection to a page entry, 732 * and a page entry and page directory to the page they refer to. 733 * 734 * (Currently stuck as a macro because of indirect forward reference 735 * to linux/mm.h:page_to_nid()) 736 */ 737 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 738 739 /* 740 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] 741 * 742 * this function returns the index of the entry in the pte page which would 743 * control the given virtual address 744 */ 745 static inline unsigned long pte_index(unsigned long address) 746 { 747 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); 748 } 749 750 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address) 751 { 752 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address); 753 } 754 755 static inline int pmd_bad(pmd_t pmd) 756 { 757 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE; 758 } 759 760 static inline unsigned long pages_to_mb(unsigned long npg) 761 { 762 return npg >> (20 - PAGE_SHIFT); 763 } 764 765 #if CONFIG_PGTABLE_LEVELS > 2 766 static inline int pud_none(pud_t pud) 767 { 768 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0; 769 } 770 771 static inline int pud_present(pud_t pud) 772 { 773 return pud_flags(pud) & _PAGE_PRESENT; 774 } 775 776 static inline unsigned long pud_page_vaddr(pud_t pud) 777 { 778 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud)); 779 } 780 781 /* 782 * Currently stuck as a macro due to indirect forward reference to 783 * linux/mmzone.h's __section_mem_map_addr() definition: 784 */ 785 #define pud_page(pud) pfn_to_page(pud_pfn(pud)) 786 787 /* Find an entry in the second-level page table.. */ 788 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) 789 { 790 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); 791 } 792 793 static inline int pud_large(pud_t pud) 794 { 795 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) == 796 (_PAGE_PSE | _PAGE_PRESENT); 797 } 798 799 static inline int pud_bad(pud_t pud) 800 { 801 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0; 802 } 803 #else 804 static inline int pud_large(pud_t pud) 805 { 806 return 0; 807 } 808 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 809 810 static inline unsigned long pud_index(unsigned long address) 811 { 812 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); 813 } 814 815 #if CONFIG_PGTABLE_LEVELS > 3 816 static inline int p4d_none(p4d_t p4d) 817 { 818 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0; 819 } 820 821 static inline int p4d_present(p4d_t p4d) 822 { 823 return p4d_flags(p4d) & _PAGE_PRESENT; 824 } 825 826 static inline unsigned long p4d_page_vaddr(p4d_t p4d) 827 { 828 return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d)); 829 } 830 831 /* 832 * Currently stuck as a macro due to indirect forward reference to 833 * linux/mmzone.h's __section_mem_map_addr() definition: 834 */ 835 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d)) 836 837 /* Find an entry in the third-level page table.. */ 838 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) 839 { 840 return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address); 841 } 842 843 static inline int p4d_bad(p4d_t p4d) 844 { 845 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER; 846 847 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) 848 ignore_flags |= _PAGE_NX; 849 850 return (p4d_flags(p4d) & ~ignore_flags) != 0; 851 } 852 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 853 854 static inline unsigned long p4d_index(unsigned long address) 855 { 856 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1); 857 } 858 859 #if CONFIG_PGTABLE_LEVELS > 4 860 static inline int pgd_present(pgd_t pgd) 861 { 862 if (!pgtable_l5_enabled) 863 return 1; 864 return pgd_flags(pgd) & _PAGE_PRESENT; 865 } 866 867 static inline unsigned long pgd_page_vaddr(pgd_t pgd) 868 { 869 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK); 870 } 871 872 /* 873 * Currently stuck as a macro due to indirect forward reference to 874 * linux/mmzone.h's __section_mem_map_addr() definition: 875 */ 876 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd)) 877 878 /* to find an entry in a page-table-directory. */ 879 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) 880 { 881 if (!pgtable_l5_enabled) 882 return (p4d_t *)pgd; 883 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address); 884 } 885 886 static inline int pgd_bad(pgd_t pgd) 887 { 888 unsigned long ignore_flags = _PAGE_USER; 889 890 if (!pgtable_l5_enabled) 891 return 0; 892 893 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) 894 ignore_flags |= _PAGE_NX; 895 896 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE; 897 } 898 899 static inline int pgd_none(pgd_t pgd) 900 { 901 if (!pgtable_l5_enabled) 902 return 0; 903 /* 904 * There is no need to do a workaround for the KNL stray 905 * A/D bit erratum here. PGDs only point to page tables 906 * except on 32-bit non-PAE which is not supported on 907 * KNL. 908 */ 909 return !native_pgd_val(pgd); 910 } 911 #endif /* CONFIG_PGTABLE_LEVELS > 4 */ 912 913 #endif /* __ASSEMBLY__ */ 914 915 /* 916 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] 917 * 918 * this macro returns the index of the entry in the pgd page which would 919 * control the given virtual address 920 */ 921 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 922 923 /* 924 * pgd_offset() returns a (pgd_t *) 925 * pgd_index() is used get the offset into the pgd page's array of pgd_t's; 926 */ 927 #define pgd_offset_pgd(pgd, address) (pgd + pgd_index((address))) 928 /* 929 * a shortcut to get a pgd_t in a given mm 930 */ 931 #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address)) 932 /* 933 * a shortcut which implies the use of the kernel's pgd, instead 934 * of a process's 935 */ 936 #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) 937 938 939 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET) 940 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY) 941 942 #ifndef __ASSEMBLY__ 943 944 extern int direct_gbpages; 945 void init_mem_mapping(void); 946 void early_alloc_pgt_buf(void); 947 extern void memblock_find_dma_reserve(void); 948 949 #ifdef CONFIG_X86_64 950 /* Realmode trampoline initialization. */ 951 extern pgd_t trampoline_pgd_entry; 952 static inline void __meminit init_trampoline_default(void) 953 { 954 /* Default trampoline pgd value */ 955 trampoline_pgd_entry = init_top_pgt[pgd_index(__PAGE_OFFSET)]; 956 } 957 # ifdef CONFIG_RANDOMIZE_MEMORY 958 void __meminit init_trampoline(void); 959 # else 960 # define init_trampoline init_trampoline_default 961 # endif 962 #else 963 static inline void init_trampoline(void) { } 964 #endif 965 966 /* local pte updates need not use xchg for locking */ 967 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) 968 { 969 pte_t res = *ptep; 970 971 /* Pure native function needs no input for mm, addr */ 972 native_pte_clear(NULL, 0, ptep); 973 return res; 974 } 975 976 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp) 977 { 978 pmd_t res = *pmdp; 979 980 native_pmd_clear(pmdp); 981 return res; 982 } 983 984 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp) 985 { 986 pud_t res = *pudp; 987 988 native_pud_clear(pudp); 989 return res; 990 } 991 992 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, 993 pte_t *ptep , pte_t pte) 994 { 995 native_set_pte(ptep, pte); 996 } 997 998 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, 999 pmd_t *pmdp, pmd_t pmd) 1000 { 1001 native_set_pmd(pmdp, pmd); 1002 } 1003 1004 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr, 1005 pud_t *pudp, pud_t pud) 1006 { 1007 native_set_pud(pudp, pud); 1008 } 1009 1010 /* 1011 * We only update the dirty/accessed state if we set 1012 * the dirty bit by hand in the kernel, since the hardware 1013 * will do the accessed bit for us, and we don't want to 1014 * race with other CPU's that might be updating the dirty 1015 * bit at the same time. 1016 */ 1017 struct vm_area_struct; 1018 1019 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 1020 extern int ptep_set_access_flags(struct vm_area_struct *vma, 1021 unsigned long address, pte_t *ptep, 1022 pte_t entry, int dirty); 1023 1024 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 1025 extern int ptep_test_and_clear_young(struct vm_area_struct *vma, 1026 unsigned long addr, pte_t *ptep); 1027 1028 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 1029 extern int ptep_clear_flush_young(struct vm_area_struct *vma, 1030 unsigned long address, pte_t *ptep); 1031 1032 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 1033 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 1034 pte_t *ptep) 1035 { 1036 pte_t pte = native_ptep_get_and_clear(ptep); 1037 return pte; 1038 } 1039 1040 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL 1041 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, 1042 unsigned long addr, pte_t *ptep, 1043 int full) 1044 { 1045 pte_t pte; 1046 if (full) { 1047 /* 1048 * Full address destruction in progress; paravirt does not 1049 * care about updates and native needs no locking 1050 */ 1051 pte = native_local_ptep_get_and_clear(ptep); 1052 } else { 1053 pte = ptep_get_and_clear(mm, addr, ptep); 1054 } 1055 return pte; 1056 } 1057 1058 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 1059 static inline void ptep_set_wrprotect(struct mm_struct *mm, 1060 unsigned long addr, pte_t *ptep) 1061 { 1062 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte); 1063 } 1064 1065 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0) 1066 1067 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot)) 1068 1069 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS 1070 extern int pmdp_set_access_flags(struct vm_area_struct *vma, 1071 unsigned long address, pmd_t *pmdp, 1072 pmd_t entry, int dirty); 1073 extern int pudp_set_access_flags(struct vm_area_struct *vma, 1074 unsigned long address, pud_t *pudp, 1075 pud_t entry, int dirty); 1076 1077 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 1078 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, 1079 unsigned long addr, pmd_t *pmdp); 1080 extern int pudp_test_and_clear_young(struct vm_area_struct *vma, 1081 unsigned long addr, pud_t *pudp); 1082 1083 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH 1084 extern int pmdp_clear_flush_young(struct vm_area_struct *vma, 1085 unsigned long address, pmd_t *pmdp); 1086 1087 1088 #define pmd_write pmd_write 1089 static inline int pmd_write(pmd_t pmd) 1090 { 1091 return pmd_flags(pmd) & _PAGE_RW; 1092 } 1093 1094 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 1095 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr, 1096 pmd_t *pmdp) 1097 { 1098 return native_pmdp_get_and_clear(pmdp); 1099 } 1100 1101 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR 1102 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, 1103 unsigned long addr, pud_t *pudp) 1104 { 1105 return native_pudp_get_and_clear(pudp); 1106 } 1107 1108 #define __HAVE_ARCH_PMDP_SET_WRPROTECT 1109 static inline void pmdp_set_wrprotect(struct mm_struct *mm, 1110 unsigned long addr, pmd_t *pmdp) 1111 { 1112 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp); 1113 } 1114 1115 #define pud_write pud_write 1116 static inline int pud_write(pud_t pud) 1117 { 1118 return pud_flags(pud) & _PAGE_RW; 1119 } 1120 1121 #ifndef pmdp_establish 1122 #define pmdp_establish pmdp_establish 1123 static inline pmd_t pmdp_establish(struct vm_area_struct *vma, 1124 unsigned long address, pmd_t *pmdp, pmd_t pmd) 1125 { 1126 if (IS_ENABLED(CONFIG_SMP)) { 1127 return xchg(pmdp, pmd); 1128 } else { 1129 pmd_t old = *pmdp; 1130 *pmdp = pmd; 1131 return old; 1132 } 1133 } 1134 #endif 1135 1136 /* 1137 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); 1138 * 1139 * dst - pointer to pgd range anwhere on a pgd page 1140 * src - "" 1141 * count - the number of pgds to copy. 1142 * 1143 * dst and src can be on the same page, but the range must not overlap, 1144 * and must not cross a page boundary. 1145 */ 1146 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) 1147 { 1148 memcpy(dst, src, count * sizeof(pgd_t)); 1149 #ifdef CONFIG_PAGE_TABLE_ISOLATION 1150 if (!static_cpu_has(X86_FEATURE_PTI)) 1151 return; 1152 /* Clone the user space pgd as well */ 1153 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src), 1154 count * sizeof(pgd_t)); 1155 #endif 1156 } 1157 1158 #define PTE_SHIFT ilog2(PTRS_PER_PTE) 1159 static inline int page_level_shift(enum pg_level level) 1160 { 1161 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT; 1162 } 1163 static inline unsigned long page_level_size(enum pg_level level) 1164 { 1165 return 1UL << page_level_shift(level); 1166 } 1167 static inline unsigned long page_level_mask(enum pg_level level) 1168 { 1169 return ~(page_level_size(level) - 1); 1170 } 1171 1172 /* 1173 * The x86 doesn't have any external MMU info: the kernel page 1174 * tables contain all the necessary information. 1175 */ 1176 static inline void update_mmu_cache(struct vm_area_struct *vma, 1177 unsigned long addr, pte_t *ptep) 1178 { 1179 } 1180 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 1181 unsigned long addr, pmd_t *pmd) 1182 { 1183 } 1184 static inline void update_mmu_cache_pud(struct vm_area_struct *vma, 1185 unsigned long addr, pud_t *pud) 1186 { 1187 } 1188 1189 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 1190 static inline pte_t pte_swp_mksoft_dirty(pte_t pte) 1191 { 1192 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY); 1193 } 1194 1195 static inline int pte_swp_soft_dirty(pte_t pte) 1196 { 1197 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY; 1198 } 1199 1200 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) 1201 { 1202 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY); 1203 } 1204 1205 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION 1206 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) 1207 { 1208 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY); 1209 } 1210 1211 static inline int pmd_swp_soft_dirty(pmd_t pmd) 1212 { 1213 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY; 1214 } 1215 1216 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) 1217 { 1218 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY); 1219 } 1220 #endif 1221 #endif 1222 1223 #define PKRU_AD_BIT 0x1 1224 #define PKRU_WD_BIT 0x2 1225 #define PKRU_BITS_PER_PKEY 2 1226 1227 static inline bool __pkru_allows_read(u32 pkru, u16 pkey) 1228 { 1229 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY; 1230 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits)); 1231 } 1232 1233 static inline bool __pkru_allows_write(u32 pkru, u16 pkey) 1234 { 1235 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY; 1236 /* 1237 * Access-disable disables writes too so we need to check 1238 * both bits here. 1239 */ 1240 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits)); 1241 } 1242 1243 static inline u16 pte_flags_pkey(unsigned long pte_flags) 1244 { 1245 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS 1246 /* ifdef to avoid doing 59-bit shift on 32-bit values */ 1247 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0; 1248 #else 1249 return 0; 1250 #endif 1251 } 1252 1253 static inline bool __pkru_allows_pkey(u16 pkey, bool write) 1254 { 1255 u32 pkru = read_pkru(); 1256 1257 if (!__pkru_allows_read(pkru, pkey)) 1258 return false; 1259 if (write && !__pkru_allows_write(pkru, pkey)) 1260 return false; 1261 1262 return true; 1263 } 1264 1265 /* 1266 * 'pteval' can come from a PTE, PMD or PUD. We only check 1267 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the 1268 * same value on all 3 types. 1269 */ 1270 static inline bool __pte_access_permitted(unsigned long pteval, bool write) 1271 { 1272 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER; 1273 1274 if (write) 1275 need_pte_bits |= _PAGE_RW; 1276 1277 if ((pteval & need_pte_bits) != need_pte_bits) 1278 return 0; 1279 1280 return __pkru_allows_pkey(pte_flags_pkey(pteval), write); 1281 } 1282 1283 #define pte_access_permitted pte_access_permitted 1284 static inline bool pte_access_permitted(pte_t pte, bool write) 1285 { 1286 return __pte_access_permitted(pte_val(pte), write); 1287 } 1288 1289 #define pmd_access_permitted pmd_access_permitted 1290 static inline bool pmd_access_permitted(pmd_t pmd, bool write) 1291 { 1292 return __pte_access_permitted(pmd_val(pmd), write); 1293 } 1294 1295 #define pud_access_permitted pud_access_permitted 1296 static inline bool pud_access_permitted(pud_t pud, bool write) 1297 { 1298 return __pte_access_permitted(pud_val(pud), write); 1299 } 1300 1301 #include <asm-generic/pgtable.h> 1302 #endif /* __ASSEMBLY__ */ 1303 1304 #endif /* _ASM_X86_PGTABLE_H */ 1305