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 pgprotval_t check_pgprot(pgprot_t pgprot) 530 { 531 pgprotval_t massaged_val = massage_pgprot(pgprot); 532 533 /* mmdebug.h can not be included here because of dependencies */ 534 #ifdef CONFIG_DEBUG_VM 535 WARN_ONCE(pgprot_val(pgprot) != massaged_val, 536 "attempted to set unsupported pgprot: %016llx " 537 "bits: %016llx supported: %016llx\n", 538 (u64)pgprot_val(pgprot), 539 (u64)pgprot_val(pgprot) ^ massaged_val, 540 (u64)__supported_pte_mask); 541 #endif 542 543 return massaged_val; 544 } 545 546 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) 547 { 548 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) | 549 check_pgprot(pgprot)); 550 } 551 552 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) 553 { 554 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) | 555 check_pgprot(pgprot)); 556 } 557 558 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot) 559 { 560 return __pud(((phys_addr_t)page_nr << PAGE_SHIFT) | 561 check_pgprot(pgprot)); 562 } 563 564 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 565 { 566 pteval_t val = pte_val(pte); 567 568 /* 569 * Chop off the NX bit (if present), and add the NX portion of 570 * the newprot (if present): 571 */ 572 val &= _PAGE_CHG_MASK; 573 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK; 574 575 return __pte(val); 576 } 577 578 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 579 { 580 pmdval_t val = pmd_val(pmd); 581 582 val &= _HPAGE_CHG_MASK; 583 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK; 584 585 return __pmd(val); 586 } 587 588 /* mprotect needs to preserve PAT bits when updating vm_page_prot */ 589 #define pgprot_modify pgprot_modify 590 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) 591 { 592 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; 593 pgprotval_t addbits = pgprot_val(newprot); 594 return __pgprot(preservebits | addbits); 595 } 596 597 #define pte_pgprot(x) __pgprot(pte_flags(x)) 598 #define pmd_pgprot(x) __pgprot(pmd_flags(x)) 599 #define pud_pgprot(x) __pgprot(pud_flags(x)) 600 #define p4d_pgprot(x) __pgprot(p4d_flags(x)) 601 602 #define canon_pgprot(p) __pgprot(massage_pgprot(p)) 603 604 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size, 605 enum page_cache_mode pcm, 606 enum page_cache_mode new_pcm) 607 { 608 /* 609 * PAT type is always WB for untracked ranges, so no need to check. 610 */ 611 if (x86_platform.is_untracked_pat_range(paddr, paddr + size)) 612 return 1; 613 614 /* 615 * Certain new memtypes are not allowed with certain 616 * requested memtype: 617 * - request is uncached, return cannot be write-back 618 * - request is write-combine, return cannot be write-back 619 * - request is write-through, return cannot be write-back 620 * - request is write-through, return cannot be write-combine 621 */ 622 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS && 623 new_pcm == _PAGE_CACHE_MODE_WB) || 624 (pcm == _PAGE_CACHE_MODE_WC && 625 new_pcm == _PAGE_CACHE_MODE_WB) || 626 (pcm == _PAGE_CACHE_MODE_WT && 627 new_pcm == _PAGE_CACHE_MODE_WB) || 628 (pcm == _PAGE_CACHE_MODE_WT && 629 new_pcm == _PAGE_CACHE_MODE_WC)) { 630 return 0; 631 } 632 633 return 1; 634 } 635 636 pmd_t *populate_extra_pmd(unsigned long vaddr); 637 pte_t *populate_extra_pte(unsigned long vaddr); 638 #endif /* __ASSEMBLY__ */ 639 640 #ifdef CONFIG_X86_32 641 # include <asm/pgtable_32.h> 642 #else 643 # include <asm/pgtable_64.h> 644 #endif 645 646 #ifndef __ASSEMBLY__ 647 #include <linux/mm_types.h> 648 #include <linux/mmdebug.h> 649 #include <linux/log2.h> 650 #include <asm/fixmap.h> 651 652 static inline int pte_none(pte_t pte) 653 { 654 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK)); 655 } 656 657 #define __HAVE_ARCH_PTE_SAME 658 static inline int pte_same(pte_t a, pte_t b) 659 { 660 return a.pte == b.pte; 661 } 662 663 static inline int pte_present(pte_t a) 664 { 665 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE); 666 } 667 668 #ifdef __HAVE_ARCH_PTE_DEVMAP 669 static inline int pte_devmap(pte_t a) 670 { 671 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP; 672 } 673 #endif 674 675 #define pte_accessible pte_accessible 676 static inline bool pte_accessible(struct mm_struct *mm, pte_t a) 677 { 678 if (pte_flags(a) & _PAGE_PRESENT) 679 return true; 680 681 if ((pte_flags(a) & _PAGE_PROTNONE) && 682 mm_tlb_flush_pending(mm)) 683 return true; 684 685 return false; 686 } 687 688 static inline int pmd_present(pmd_t pmd) 689 { 690 /* 691 * Checking for _PAGE_PSE is needed too because 692 * split_huge_page will temporarily clear the present bit (but 693 * the _PAGE_PSE flag will remain set at all times while the 694 * _PAGE_PRESENT bit is clear). 695 */ 696 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE); 697 } 698 699 #ifdef CONFIG_NUMA_BALANCING 700 /* 701 * These work without NUMA balancing but the kernel does not care. See the 702 * comment in include/asm-generic/pgtable.h 703 */ 704 static inline int pte_protnone(pte_t pte) 705 { 706 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT)) 707 == _PAGE_PROTNONE; 708 } 709 710 static inline int pmd_protnone(pmd_t pmd) 711 { 712 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT)) 713 == _PAGE_PROTNONE; 714 } 715 #endif /* CONFIG_NUMA_BALANCING */ 716 717 static inline int pmd_none(pmd_t pmd) 718 { 719 /* Only check low word on 32-bit platforms, since it might be 720 out of sync with upper half. */ 721 unsigned long val = native_pmd_val(pmd); 722 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0; 723 } 724 725 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 726 { 727 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd)); 728 } 729 730 /* 731 * Currently stuck as a macro due to indirect forward reference to 732 * linux/mmzone.h's __section_mem_map_addr() definition: 733 */ 734 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd)) 735 736 /* 737 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] 738 * 739 * this macro returns the index of the entry in the pmd page which would 740 * control the given virtual address 741 */ 742 static inline unsigned long pmd_index(unsigned long address) 743 { 744 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); 745 } 746 747 /* 748 * Conversion functions: convert a page and protection to a page entry, 749 * and a page entry and page directory to the page they refer to. 750 * 751 * (Currently stuck as a macro because of indirect forward reference 752 * to linux/mm.h:page_to_nid()) 753 */ 754 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 755 756 /* 757 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] 758 * 759 * this function returns the index of the entry in the pte page which would 760 * control the given virtual address 761 */ 762 static inline unsigned long pte_index(unsigned long address) 763 { 764 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); 765 } 766 767 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address) 768 { 769 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address); 770 } 771 772 static inline int pmd_bad(pmd_t pmd) 773 { 774 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE; 775 } 776 777 static inline unsigned long pages_to_mb(unsigned long npg) 778 { 779 return npg >> (20 - PAGE_SHIFT); 780 } 781 782 #if CONFIG_PGTABLE_LEVELS > 2 783 static inline int pud_none(pud_t pud) 784 { 785 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0; 786 } 787 788 static inline int pud_present(pud_t pud) 789 { 790 return pud_flags(pud) & _PAGE_PRESENT; 791 } 792 793 static inline unsigned long pud_page_vaddr(pud_t pud) 794 { 795 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud)); 796 } 797 798 /* 799 * Currently stuck as a macro due to indirect forward reference to 800 * linux/mmzone.h's __section_mem_map_addr() definition: 801 */ 802 #define pud_page(pud) pfn_to_page(pud_pfn(pud)) 803 804 /* Find an entry in the second-level page table.. */ 805 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) 806 { 807 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); 808 } 809 810 static inline int pud_large(pud_t pud) 811 { 812 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) == 813 (_PAGE_PSE | _PAGE_PRESENT); 814 } 815 816 static inline int pud_bad(pud_t pud) 817 { 818 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0; 819 } 820 #else 821 static inline int pud_large(pud_t pud) 822 { 823 return 0; 824 } 825 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 826 827 static inline unsigned long pud_index(unsigned long address) 828 { 829 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); 830 } 831 832 #if CONFIG_PGTABLE_LEVELS > 3 833 static inline int p4d_none(p4d_t p4d) 834 { 835 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0; 836 } 837 838 static inline int p4d_present(p4d_t p4d) 839 { 840 return p4d_flags(p4d) & _PAGE_PRESENT; 841 } 842 843 static inline unsigned long p4d_page_vaddr(p4d_t p4d) 844 { 845 return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d)); 846 } 847 848 /* 849 * Currently stuck as a macro due to indirect forward reference to 850 * linux/mmzone.h's __section_mem_map_addr() definition: 851 */ 852 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d)) 853 854 /* Find an entry in the third-level page table.. */ 855 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) 856 { 857 return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address); 858 } 859 860 static inline int p4d_bad(p4d_t p4d) 861 { 862 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER; 863 864 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) 865 ignore_flags |= _PAGE_NX; 866 867 return (p4d_flags(p4d) & ~ignore_flags) != 0; 868 } 869 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 870 871 static inline unsigned long p4d_index(unsigned long address) 872 { 873 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1); 874 } 875 876 #if CONFIG_PGTABLE_LEVELS > 4 877 static inline int pgd_present(pgd_t pgd) 878 { 879 if (!pgtable_l5_enabled) 880 return 1; 881 return pgd_flags(pgd) & _PAGE_PRESENT; 882 } 883 884 static inline unsigned long pgd_page_vaddr(pgd_t pgd) 885 { 886 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK); 887 } 888 889 /* 890 * Currently stuck as a macro due to indirect forward reference to 891 * linux/mmzone.h's __section_mem_map_addr() definition: 892 */ 893 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd)) 894 895 /* to find an entry in a page-table-directory. */ 896 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) 897 { 898 if (!pgtable_l5_enabled) 899 return (p4d_t *)pgd; 900 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address); 901 } 902 903 static inline int pgd_bad(pgd_t pgd) 904 { 905 unsigned long ignore_flags = _PAGE_USER; 906 907 if (!pgtable_l5_enabled) 908 return 0; 909 910 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) 911 ignore_flags |= _PAGE_NX; 912 913 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE; 914 } 915 916 static inline int pgd_none(pgd_t pgd) 917 { 918 if (!pgtable_l5_enabled) 919 return 0; 920 /* 921 * There is no need to do a workaround for the KNL stray 922 * A/D bit erratum here. PGDs only point to page tables 923 * except on 32-bit non-PAE which is not supported on 924 * KNL. 925 */ 926 return !native_pgd_val(pgd); 927 } 928 #endif /* CONFIG_PGTABLE_LEVELS > 4 */ 929 930 #endif /* __ASSEMBLY__ */ 931 932 /* 933 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] 934 * 935 * this macro returns the index of the entry in the pgd page which would 936 * control the given virtual address 937 */ 938 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 939 940 /* 941 * pgd_offset() returns a (pgd_t *) 942 * pgd_index() is used get the offset into the pgd page's array of pgd_t's; 943 */ 944 #define pgd_offset_pgd(pgd, address) (pgd + pgd_index((address))) 945 /* 946 * a shortcut to get a pgd_t in a given mm 947 */ 948 #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address)) 949 /* 950 * a shortcut which implies the use of the kernel's pgd, instead 951 * of a process's 952 */ 953 #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) 954 955 956 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET) 957 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY) 958 959 #ifndef __ASSEMBLY__ 960 961 extern int direct_gbpages; 962 void init_mem_mapping(void); 963 void early_alloc_pgt_buf(void); 964 extern void memblock_find_dma_reserve(void); 965 966 #ifdef CONFIG_X86_64 967 /* Realmode trampoline initialization. */ 968 extern pgd_t trampoline_pgd_entry; 969 static inline void __meminit init_trampoline_default(void) 970 { 971 /* Default trampoline pgd value */ 972 trampoline_pgd_entry = init_top_pgt[pgd_index(__PAGE_OFFSET)]; 973 } 974 # ifdef CONFIG_RANDOMIZE_MEMORY 975 void __meminit init_trampoline(void); 976 # else 977 # define init_trampoline init_trampoline_default 978 # endif 979 #else 980 static inline void init_trampoline(void) { } 981 #endif 982 983 /* local pte updates need not use xchg for locking */ 984 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) 985 { 986 pte_t res = *ptep; 987 988 /* Pure native function needs no input for mm, addr */ 989 native_pte_clear(NULL, 0, ptep); 990 return res; 991 } 992 993 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp) 994 { 995 pmd_t res = *pmdp; 996 997 native_pmd_clear(pmdp); 998 return res; 999 } 1000 1001 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp) 1002 { 1003 pud_t res = *pudp; 1004 1005 native_pud_clear(pudp); 1006 return res; 1007 } 1008 1009 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, 1010 pte_t *ptep , pte_t pte) 1011 { 1012 native_set_pte(ptep, pte); 1013 } 1014 1015 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, 1016 pmd_t *pmdp, pmd_t pmd) 1017 { 1018 native_set_pmd(pmdp, pmd); 1019 } 1020 1021 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr, 1022 pud_t *pudp, pud_t pud) 1023 { 1024 native_set_pud(pudp, pud); 1025 } 1026 1027 /* 1028 * We only update the dirty/accessed state if we set 1029 * the dirty bit by hand in the kernel, since the hardware 1030 * will do the accessed bit for us, and we don't want to 1031 * race with other CPU's that might be updating the dirty 1032 * bit at the same time. 1033 */ 1034 struct vm_area_struct; 1035 1036 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 1037 extern int ptep_set_access_flags(struct vm_area_struct *vma, 1038 unsigned long address, pte_t *ptep, 1039 pte_t entry, int dirty); 1040 1041 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 1042 extern int ptep_test_and_clear_young(struct vm_area_struct *vma, 1043 unsigned long addr, pte_t *ptep); 1044 1045 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 1046 extern int ptep_clear_flush_young(struct vm_area_struct *vma, 1047 unsigned long address, pte_t *ptep); 1048 1049 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 1050 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 1051 pte_t *ptep) 1052 { 1053 pte_t pte = native_ptep_get_and_clear(ptep); 1054 return pte; 1055 } 1056 1057 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL 1058 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, 1059 unsigned long addr, pte_t *ptep, 1060 int full) 1061 { 1062 pte_t pte; 1063 if (full) { 1064 /* 1065 * Full address destruction in progress; paravirt does not 1066 * care about updates and native needs no locking 1067 */ 1068 pte = native_local_ptep_get_and_clear(ptep); 1069 } else { 1070 pte = ptep_get_and_clear(mm, addr, ptep); 1071 } 1072 return pte; 1073 } 1074 1075 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 1076 static inline void ptep_set_wrprotect(struct mm_struct *mm, 1077 unsigned long addr, pte_t *ptep) 1078 { 1079 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte); 1080 } 1081 1082 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0) 1083 1084 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot)) 1085 1086 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS 1087 extern int pmdp_set_access_flags(struct vm_area_struct *vma, 1088 unsigned long address, pmd_t *pmdp, 1089 pmd_t entry, int dirty); 1090 extern int pudp_set_access_flags(struct vm_area_struct *vma, 1091 unsigned long address, pud_t *pudp, 1092 pud_t entry, int dirty); 1093 1094 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 1095 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, 1096 unsigned long addr, pmd_t *pmdp); 1097 extern int pudp_test_and_clear_young(struct vm_area_struct *vma, 1098 unsigned long addr, pud_t *pudp); 1099 1100 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH 1101 extern int pmdp_clear_flush_young(struct vm_area_struct *vma, 1102 unsigned long address, pmd_t *pmdp); 1103 1104 1105 #define pmd_write pmd_write 1106 static inline int pmd_write(pmd_t pmd) 1107 { 1108 return pmd_flags(pmd) & _PAGE_RW; 1109 } 1110 1111 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 1112 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr, 1113 pmd_t *pmdp) 1114 { 1115 return native_pmdp_get_and_clear(pmdp); 1116 } 1117 1118 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR 1119 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, 1120 unsigned long addr, pud_t *pudp) 1121 { 1122 return native_pudp_get_and_clear(pudp); 1123 } 1124 1125 #define __HAVE_ARCH_PMDP_SET_WRPROTECT 1126 static inline void pmdp_set_wrprotect(struct mm_struct *mm, 1127 unsigned long addr, pmd_t *pmdp) 1128 { 1129 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp); 1130 } 1131 1132 #define pud_write pud_write 1133 static inline int pud_write(pud_t pud) 1134 { 1135 return pud_flags(pud) & _PAGE_RW; 1136 } 1137 1138 #ifndef pmdp_establish 1139 #define pmdp_establish pmdp_establish 1140 static inline pmd_t pmdp_establish(struct vm_area_struct *vma, 1141 unsigned long address, pmd_t *pmdp, pmd_t pmd) 1142 { 1143 if (IS_ENABLED(CONFIG_SMP)) { 1144 return xchg(pmdp, pmd); 1145 } else { 1146 pmd_t old = *pmdp; 1147 *pmdp = pmd; 1148 return old; 1149 } 1150 } 1151 #endif 1152 1153 /* 1154 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); 1155 * 1156 * dst - pointer to pgd range anwhere on a pgd page 1157 * src - "" 1158 * count - the number of pgds to copy. 1159 * 1160 * dst and src can be on the same page, but the range must not overlap, 1161 * and must not cross a page boundary. 1162 */ 1163 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) 1164 { 1165 memcpy(dst, src, count * sizeof(pgd_t)); 1166 #ifdef CONFIG_PAGE_TABLE_ISOLATION 1167 if (!static_cpu_has(X86_FEATURE_PTI)) 1168 return; 1169 /* Clone the user space pgd as well */ 1170 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src), 1171 count * sizeof(pgd_t)); 1172 #endif 1173 } 1174 1175 #define PTE_SHIFT ilog2(PTRS_PER_PTE) 1176 static inline int page_level_shift(enum pg_level level) 1177 { 1178 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT; 1179 } 1180 static inline unsigned long page_level_size(enum pg_level level) 1181 { 1182 return 1UL << page_level_shift(level); 1183 } 1184 static inline unsigned long page_level_mask(enum pg_level level) 1185 { 1186 return ~(page_level_size(level) - 1); 1187 } 1188 1189 /* 1190 * The x86 doesn't have any external MMU info: the kernel page 1191 * tables contain all the necessary information. 1192 */ 1193 static inline void update_mmu_cache(struct vm_area_struct *vma, 1194 unsigned long addr, pte_t *ptep) 1195 { 1196 } 1197 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 1198 unsigned long addr, pmd_t *pmd) 1199 { 1200 } 1201 static inline void update_mmu_cache_pud(struct vm_area_struct *vma, 1202 unsigned long addr, pud_t *pud) 1203 { 1204 } 1205 1206 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 1207 static inline pte_t pte_swp_mksoft_dirty(pte_t pte) 1208 { 1209 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY); 1210 } 1211 1212 static inline int pte_swp_soft_dirty(pte_t pte) 1213 { 1214 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY; 1215 } 1216 1217 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) 1218 { 1219 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY); 1220 } 1221 1222 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION 1223 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) 1224 { 1225 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY); 1226 } 1227 1228 static inline int pmd_swp_soft_dirty(pmd_t pmd) 1229 { 1230 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY; 1231 } 1232 1233 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) 1234 { 1235 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY); 1236 } 1237 #endif 1238 #endif 1239 1240 #define PKRU_AD_BIT 0x1 1241 #define PKRU_WD_BIT 0x2 1242 #define PKRU_BITS_PER_PKEY 2 1243 1244 static inline bool __pkru_allows_read(u32 pkru, u16 pkey) 1245 { 1246 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY; 1247 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits)); 1248 } 1249 1250 static inline bool __pkru_allows_write(u32 pkru, u16 pkey) 1251 { 1252 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY; 1253 /* 1254 * Access-disable disables writes too so we need to check 1255 * both bits here. 1256 */ 1257 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits)); 1258 } 1259 1260 static inline u16 pte_flags_pkey(unsigned long pte_flags) 1261 { 1262 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS 1263 /* ifdef to avoid doing 59-bit shift on 32-bit values */ 1264 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0; 1265 #else 1266 return 0; 1267 #endif 1268 } 1269 1270 static inline bool __pkru_allows_pkey(u16 pkey, bool write) 1271 { 1272 u32 pkru = read_pkru(); 1273 1274 if (!__pkru_allows_read(pkru, pkey)) 1275 return false; 1276 if (write && !__pkru_allows_write(pkru, pkey)) 1277 return false; 1278 1279 return true; 1280 } 1281 1282 /* 1283 * 'pteval' can come from a PTE, PMD or PUD. We only check 1284 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the 1285 * same value on all 3 types. 1286 */ 1287 static inline bool __pte_access_permitted(unsigned long pteval, bool write) 1288 { 1289 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER; 1290 1291 if (write) 1292 need_pte_bits |= _PAGE_RW; 1293 1294 if ((pteval & need_pte_bits) != need_pte_bits) 1295 return 0; 1296 1297 return __pkru_allows_pkey(pte_flags_pkey(pteval), write); 1298 } 1299 1300 #define pte_access_permitted pte_access_permitted 1301 static inline bool pte_access_permitted(pte_t pte, bool write) 1302 { 1303 return __pte_access_permitted(pte_val(pte), write); 1304 } 1305 1306 #define pmd_access_permitted pmd_access_permitted 1307 static inline bool pmd_access_permitted(pmd_t pmd, bool write) 1308 { 1309 return __pte_access_permitted(pmd_val(pmd), write); 1310 } 1311 1312 #define pud_access_permitted pud_access_permitted 1313 static inline bool pud_access_permitted(pud_t pud, bool write) 1314 { 1315 return __pte_access_permitted(pud_val(pud), write); 1316 } 1317 1318 #include <asm-generic/pgtable.h> 1319 #endif /* __ASSEMBLY__ */ 1320 1321 #endif /* _ASM_X86_PGTABLE_H */ 1322