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 #include <asm/fpu/xstate.h> 27 #include <asm/fpu/api.h> 28 #include <asm-generic/pgtable_uffd.h> 29 30 extern pgd_t early_top_pgt[PTRS_PER_PGD]; 31 bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd); 32 33 void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm); 34 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm, 35 bool user); 36 void ptdump_walk_pgd_level_checkwx(void); 37 void ptdump_walk_user_pgd_level_checkwx(void); 38 39 #ifdef CONFIG_DEBUG_WX 40 #define debug_checkwx() ptdump_walk_pgd_level_checkwx() 41 #define debug_checkwx_user() ptdump_walk_user_pgd_level_checkwx() 42 #else 43 #define debug_checkwx() do { } while (0) 44 #define debug_checkwx_user() do { } while (0) 45 #endif 46 47 /* 48 * ZERO_PAGE is a global shared page that is always zero: used 49 * for zero-mapped memory areas etc.. 50 */ 51 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 52 __visible; 53 #define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page)) 54 55 extern spinlock_t pgd_lock; 56 extern struct list_head pgd_list; 57 58 extern struct mm_struct *pgd_page_get_mm(struct page *page); 59 60 extern pmdval_t early_pmd_flags; 61 62 #ifdef CONFIG_PARAVIRT_XXL 63 #include <asm/paravirt.h> 64 #else /* !CONFIG_PARAVIRT_XXL */ 65 #define set_pte(ptep, pte) native_set_pte(ptep, pte) 66 67 #define set_pte_atomic(ptep, pte) \ 68 native_set_pte_atomic(ptep, pte) 69 70 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd) 71 72 #ifndef __PAGETABLE_P4D_FOLDED 73 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd) 74 #define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0) 75 #endif 76 77 #ifndef set_p4d 78 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d) 79 #endif 80 81 #ifndef __PAGETABLE_PUD_FOLDED 82 #define p4d_clear(p4d) native_p4d_clear(p4d) 83 #endif 84 85 #ifndef set_pud 86 # define set_pud(pudp, pud) native_set_pud(pudp, pud) 87 #endif 88 89 #ifndef __PAGETABLE_PUD_FOLDED 90 #define pud_clear(pud) native_pud_clear(pud) 91 #endif 92 93 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep) 94 #define pmd_clear(pmd) native_pmd_clear(pmd) 95 96 #define pgd_val(x) native_pgd_val(x) 97 #define __pgd(x) native_make_pgd(x) 98 99 #ifndef __PAGETABLE_P4D_FOLDED 100 #define p4d_val(x) native_p4d_val(x) 101 #define __p4d(x) native_make_p4d(x) 102 #endif 103 104 #ifndef __PAGETABLE_PUD_FOLDED 105 #define pud_val(x) native_pud_val(x) 106 #define __pud(x) native_make_pud(x) 107 #endif 108 109 #ifndef __PAGETABLE_PMD_FOLDED 110 #define pmd_val(x) native_pmd_val(x) 111 #define __pmd(x) native_make_pmd(x) 112 #endif 113 114 #define pte_val(x) native_pte_val(x) 115 #define __pte(x) native_make_pte(x) 116 117 #define arch_end_context_switch(prev) do {} while(0) 118 #endif /* CONFIG_PARAVIRT_XXL */ 119 120 /* 121 * The following only work if pte_present() is true. 122 * Undefined behaviour if not.. 123 */ 124 static inline int pte_dirty(pte_t pte) 125 { 126 return pte_flags(pte) & _PAGE_DIRTY; 127 } 128 129 130 static inline u32 read_pkru(void) 131 { 132 if (boot_cpu_has(X86_FEATURE_OSPKE)) 133 return rdpkru(); 134 return 0; 135 } 136 137 static inline void write_pkru(u32 pkru) 138 { 139 struct pkru_state *pk; 140 141 if (!boot_cpu_has(X86_FEATURE_OSPKE)) 142 return; 143 144 pk = get_xsave_addr(¤t->thread.fpu.state.xsave, XFEATURE_PKRU); 145 146 /* 147 * The PKRU value in xstate needs to be in sync with the value that is 148 * written to the CPU. The FPU restore on return to userland would 149 * otherwise load the previous value again. 150 */ 151 fpregs_lock(); 152 if (pk) 153 pk->pkru = pkru; 154 __write_pkru(pkru); 155 fpregs_unlock(); 156 } 157 158 static inline int pte_young(pte_t pte) 159 { 160 return pte_flags(pte) & _PAGE_ACCESSED; 161 } 162 163 static inline int pmd_dirty(pmd_t pmd) 164 { 165 return pmd_flags(pmd) & _PAGE_DIRTY; 166 } 167 168 static inline int pmd_young(pmd_t pmd) 169 { 170 return pmd_flags(pmd) & _PAGE_ACCESSED; 171 } 172 173 static inline int pud_dirty(pud_t pud) 174 { 175 return pud_flags(pud) & _PAGE_DIRTY; 176 } 177 178 static inline int pud_young(pud_t pud) 179 { 180 return pud_flags(pud) & _PAGE_ACCESSED; 181 } 182 183 static inline int pte_write(pte_t pte) 184 { 185 return pte_flags(pte) & _PAGE_RW; 186 } 187 188 static inline int pte_huge(pte_t pte) 189 { 190 return pte_flags(pte) & _PAGE_PSE; 191 } 192 193 static inline int pte_global(pte_t pte) 194 { 195 return pte_flags(pte) & _PAGE_GLOBAL; 196 } 197 198 static inline int pte_exec(pte_t pte) 199 { 200 return !(pte_flags(pte) & _PAGE_NX); 201 } 202 203 static inline int pte_special(pte_t pte) 204 { 205 return pte_flags(pte) & _PAGE_SPECIAL; 206 } 207 208 /* Entries that were set to PROT_NONE are inverted */ 209 210 static inline u64 protnone_mask(u64 val); 211 212 static inline unsigned long pte_pfn(pte_t pte) 213 { 214 phys_addr_t pfn = pte_val(pte); 215 pfn ^= protnone_mask(pfn); 216 return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT; 217 } 218 219 static inline unsigned long pmd_pfn(pmd_t pmd) 220 { 221 phys_addr_t pfn = pmd_val(pmd); 222 pfn ^= protnone_mask(pfn); 223 return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT; 224 } 225 226 static inline unsigned long pud_pfn(pud_t pud) 227 { 228 phys_addr_t pfn = pud_val(pud); 229 pfn ^= protnone_mask(pfn); 230 return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT; 231 } 232 233 static inline unsigned long p4d_pfn(p4d_t p4d) 234 { 235 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT; 236 } 237 238 static inline unsigned long pgd_pfn(pgd_t pgd) 239 { 240 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT; 241 } 242 243 #define p4d_leaf p4d_large 244 static inline int p4d_large(p4d_t p4d) 245 { 246 /* No 512 GiB pages yet */ 247 return 0; 248 } 249 250 #define pte_page(pte) pfn_to_page(pte_pfn(pte)) 251 252 #define pmd_leaf pmd_large 253 static inline int pmd_large(pmd_t pte) 254 { 255 return pmd_flags(pte) & _PAGE_PSE; 256 } 257 258 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 259 /* NOTE: when predicate huge page, consider also pmd_devmap, or use pmd_large */ 260 static inline int pmd_trans_huge(pmd_t pmd) 261 { 262 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE; 263 } 264 265 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD 266 static inline int pud_trans_huge(pud_t pud) 267 { 268 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE; 269 } 270 #endif 271 272 #define has_transparent_hugepage has_transparent_hugepage 273 static inline int has_transparent_hugepage(void) 274 { 275 return boot_cpu_has(X86_FEATURE_PSE); 276 } 277 278 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP 279 static inline int pmd_devmap(pmd_t pmd) 280 { 281 return !!(pmd_val(pmd) & _PAGE_DEVMAP); 282 } 283 284 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD 285 static inline int pud_devmap(pud_t pud) 286 { 287 return !!(pud_val(pud) & _PAGE_DEVMAP); 288 } 289 #else 290 static inline int pud_devmap(pud_t pud) 291 { 292 return 0; 293 } 294 #endif 295 296 static inline int pgd_devmap(pgd_t pgd) 297 { 298 return 0; 299 } 300 #endif 301 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 302 303 static inline pte_t pte_set_flags(pte_t pte, pteval_t set) 304 { 305 pteval_t v = native_pte_val(pte); 306 307 return native_make_pte(v | set); 308 } 309 310 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear) 311 { 312 pteval_t v = native_pte_val(pte); 313 314 return native_make_pte(v & ~clear); 315 } 316 317 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP 318 static inline int pte_uffd_wp(pte_t pte) 319 { 320 return pte_flags(pte) & _PAGE_UFFD_WP; 321 } 322 323 static inline pte_t pte_mkuffd_wp(pte_t pte) 324 { 325 return pte_set_flags(pte, _PAGE_UFFD_WP); 326 } 327 328 static inline pte_t pte_clear_uffd_wp(pte_t pte) 329 { 330 return pte_clear_flags(pte, _PAGE_UFFD_WP); 331 } 332 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */ 333 334 static inline pte_t pte_mkclean(pte_t pte) 335 { 336 return pte_clear_flags(pte, _PAGE_DIRTY); 337 } 338 339 static inline pte_t pte_mkold(pte_t pte) 340 { 341 return pte_clear_flags(pte, _PAGE_ACCESSED); 342 } 343 344 static inline pte_t pte_wrprotect(pte_t pte) 345 { 346 return pte_clear_flags(pte, _PAGE_RW); 347 } 348 349 static inline pte_t pte_mkexec(pte_t pte) 350 { 351 return pte_clear_flags(pte, _PAGE_NX); 352 } 353 354 static inline pte_t pte_mkdirty(pte_t pte) 355 { 356 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); 357 } 358 359 static inline pte_t pte_mkyoung(pte_t pte) 360 { 361 return pte_set_flags(pte, _PAGE_ACCESSED); 362 } 363 364 static inline pte_t pte_mkwrite(pte_t pte) 365 { 366 return pte_set_flags(pte, _PAGE_RW); 367 } 368 369 static inline pte_t pte_mkhuge(pte_t pte) 370 { 371 return pte_set_flags(pte, _PAGE_PSE); 372 } 373 374 static inline pte_t pte_clrhuge(pte_t pte) 375 { 376 return pte_clear_flags(pte, _PAGE_PSE); 377 } 378 379 static inline pte_t pte_mkglobal(pte_t pte) 380 { 381 return pte_set_flags(pte, _PAGE_GLOBAL); 382 } 383 384 static inline pte_t pte_clrglobal(pte_t pte) 385 { 386 return pte_clear_flags(pte, _PAGE_GLOBAL); 387 } 388 389 static inline pte_t pte_mkspecial(pte_t pte) 390 { 391 return pte_set_flags(pte, _PAGE_SPECIAL); 392 } 393 394 static inline pte_t pte_mkdevmap(pte_t pte) 395 { 396 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP); 397 } 398 399 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set) 400 { 401 pmdval_t v = native_pmd_val(pmd); 402 403 return native_make_pmd(v | set); 404 } 405 406 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear) 407 { 408 pmdval_t v = native_pmd_val(pmd); 409 410 return native_make_pmd(v & ~clear); 411 } 412 413 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP 414 static inline int pmd_uffd_wp(pmd_t pmd) 415 { 416 return pmd_flags(pmd) & _PAGE_UFFD_WP; 417 } 418 419 static inline pmd_t pmd_mkuffd_wp(pmd_t pmd) 420 { 421 return pmd_set_flags(pmd, _PAGE_UFFD_WP); 422 } 423 424 static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd) 425 { 426 return pmd_clear_flags(pmd, _PAGE_UFFD_WP); 427 } 428 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */ 429 430 static inline pmd_t pmd_mkold(pmd_t pmd) 431 { 432 return pmd_clear_flags(pmd, _PAGE_ACCESSED); 433 } 434 435 static inline pmd_t pmd_mkclean(pmd_t pmd) 436 { 437 return pmd_clear_flags(pmd, _PAGE_DIRTY); 438 } 439 440 static inline pmd_t pmd_wrprotect(pmd_t pmd) 441 { 442 return pmd_clear_flags(pmd, _PAGE_RW); 443 } 444 445 static inline pmd_t pmd_mkdirty(pmd_t pmd) 446 { 447 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); 448 } 449 450 static inline pmd_t pmd_mkdevmap(pmd_t pmd) 451 { 452 return pmd_set_flags(pmd, _PAGE_DEVMAP); 453 } 454 455 static inline pmd_t pmd_mkhuge(pmd_t pmd) 456 { 457 return pmd_set_flags(pmd, _PAGE_PSE); 458 } 459 460 static inline pmd_t pmd_mkyoung(pmd_t pmd) 461 { 462 return pmd_set_flags(pmd, _PAGE_ACCESSED); 463 } 464 465 static inline pmd_t pmd_mkwrite(pmd_t pmd) 466 { 467 return pmd_set_flags(pmd, _PAGE_RW); 468 } 469 470 static inline pud_t pud_set_flags(pud_t pud, pudval_t set) 471 { 472 pudval_t v = native_pud_val(pud); 473 474 return native_make_pud(v | set); 475 } 476 477 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear) 478 { 479 pudval_t v = native_pud_val(pud); 480 481 return native_make_pud(v & ~clear); 482 } 483 484 static inline pud_t pud_mkold(pud_t pud) 485 { 486 return pud_clear_flags(pud, _PAGE_ACCESSED); 487 } 488 489 static inline pud_t pud_mkclean(pud_t pud) 490 { 491 return pud_clear_flags(pud, _PAGE_DIRTY); 492 } 493 494 static inline pud_t pud_wrprotect(pud_t pud) 495 { 496 return pud_clear_flags(pud, _PAGE_RW); 497 } 498 499 static inline pud_t pud_mkdirty(pud_t pud) 500 { 501 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); 502 } 503 504 static inline pud_t pud_mkdevmap(pud_t pud) 505 { 506 return pud_set_flags(pud, _PAGE_DEVMAP); 507 } 508 509 static inline pud_t pud_mkhuge(pud_t pud) 510 { 511 return pud_set_flags(pud, _PAGE_PSE); 512 } 513 514 static inline pud_t pud_mkyoung(pud_t pud) 515 { 516 return pud_set_flags(pud, _PAGE_ACCESSED); 517 } 518 519 static inline pud_t pud_mkwrite(pud_t pud) 520 { 521 return pud_set_flags(pud, _PAGE_RW); 522 } 523 524 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 525 static inline int pte_soft_dirty(pte_t pte) 526 { 527 return pte_flags(pte) & _PAGE_SOFT_DIRTY; 528 } 529 530 static inline int pmd_soft_dirty(pmd_t pmd) 531 { 532 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY; 533 } 534 535 static inline int pud_soft_dirty(pud_t pud) 536 { 537 return pud_flags(pud) & _PAGE_SOFT_DIRTY; 538 } 539 540 static inline pte_t pte_mksoft_dirty(pte_t pte) 541 { 542 return pte_set_flags(pte, _PAGE_SOFT_DIRTY); 543 } 544 545 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) 546 { 547 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY); 548 } 549 550 static inline pud_t pud_mksoft_dirty(pud_t pud) 551 { 552 return pud_set_flags(pud, _PAGE_SOFT_DIRTY); 553 } 554 555 static inline pte_t pte_clear_soft_dirty(pte_t pte) 556 { 557 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY); 558 } 559 560 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) 561 { 562 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY); 563 } 564 565 static inline pud_t pud_clear_soft_dirty(pud_t pud) 566 { 567 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY); 568 } 569 570 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 571 572 /* 573 * Mask out unsupported bits in a present pgprot. Non-present pgprots 574 * can use those bits for other purposes, so leave them be. 575 */ 576 static inline pgprotval_t massage_pgprot(pgprot_t pgprot) 577 { 578 pgprotval_t protval = pgprot_val(pgprot); 579 580 if (protval & _PAGE_PRESENT) 581 protval &= __supported_pte_mask; 582 583 return protval; 584 } 585 586 static inline pgprotval_t check_pgprot(pgprot_t pgprot) 587 { 588 pgprotval_t massaged_val = massage_pgprot(pgprot); 589 590 /* mmdebug.h can not be included here because of dependencies */ 591 #ifdef CONFIG_DEBUG_VM 592 WARN_ONCE(pgprot_val(pgprot) != massaged_val, 593 "attempted to set unsupported pgprot: %016llx " 594 "bits: %016llx supported: %016llx\n", 595 (u64)pgprot_val(pgprot), 596 (u64)pgprot_val(pgprot) ^ massaged_val, 597 (u64)__supported_pte_mask); 598 #endif 599 600 return massaged_val; 601 } 602 603 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) 604 { 605 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT; 606 pfn ^= protnone_mask(pgprot_val(pgprot)); 607 pfn &= PTE_PFN_MASK; 608 return __pte(pfn | check_pgprot(pgprot)); 609 } 610 611 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) 612 { 613 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT; 614 pfn ^= protnone_mask(pgprot_val(pgprot)); 615 pfn &= PHYSICAL_PMD_PAGE_MASK; 616 return __pmd(pfn | check_pgprot(pgprot)); 617 } 618 619 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot) 620 { 621 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT; 622 pfn ^= protnone_mask(pgprot_val(pgprot)); 623 pfn &= PHYSICAL_PUD_PAGE_MASK; 624 return __pud(pfn | check_pgprot(pgprot)); 625 } 626 627 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 628 { 629 return pfn_pmd(pmd_pfn(pmd), 630 __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE))); 631 } 632 633 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask); 634 635 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 636 { 637 pteval_t val = pte_val(pte), oldval = val; 638 639 /* 640 * Chop off the NX bit (if present), and add the NX portion of 641 * the newprot (if present): 642 */ 643 val &= _PAGE_CHG_MASK; 644 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK; 645 val = flip_protnone_guard(oldval, val, PTE_PFN_MASK); 646 return __pte(val); 647 } 648 649 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 650 { 651 pmdval_t val = pmd_val(pmd), oldval = val; 652 653 val &= _HPAGE_CHG_MASK; 654 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK; 655 val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK); 656 return __pmd(val); 657 } 658 659 /* 660 * mprotect needs to preserve PAT and encryption bits when updating 661 * vm_page_prot 662 */ 663 #define pgprot_modify pgprot_modify 664 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) 665 { 666 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; 667 pgprotval_t addbits = pgprot_val(newprot) & ~_PAGE_CHG_MASK; 668 return __pgprot(preservebits | addbits); 669 } 670 671 #define pte_pgprot(x) __pgprot(pte_flags(x)) 672 #define pmd_pgprot(x) __pgprot(pmd_flags(x)) 673 #define pud_pgprot(x) __pgprot(pud_flags(x)) 674 #define p4d_pgprot(x) __pgprot(p4d_flags(x)) 675 676 #define canon_pgprot(p) __pgprot(massage_pgprot(p)) 677 678 static inline pgprot_t arch_filter_pgprot(pgprot_t prot) 679 { 680 return canon_pgprot(prot); 681 } 682 683 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size, 684 enum page_cache_mode pcm, 685 enum page_cache_mode new_pcm) 686 { 687 /* 688 * PAT type is always WB for untracked ranges, so no need to check. 689 */ 690 if (x86_platform.is_untracked_pat_range(paddr, paddr + size)) 691 return 1; 692 693 /* 694 * Certain new memtypes are not allowed with certain 695 * requested memtype: 696 * - request is uncached, return cannot be write-back 697 * - request is write-combine, return cannot be write-back 698 * - request is write-through, return cannot be write-back 699 * - request is write-through, return cannot be write-combine 700 */ 701 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS && 702 new_pcm == _PAGE_CACHE_MODE_WB) || 703 (pcm == _PAGE_CACHE_MODE_WC && 704 new_pcm == _PAGE_CACHE_MODE_WB) || 705 (pcm == _PAGE_CACHE_MODE_WT && 706 new_pcm == _PAGE_CACHE_MODE_WB) || 707 (pcm == _PAGE_CACHE_MODE_WT && 708 new_pcm == _PAGE_CACHE_MODE_WC)) { 709 return 0; 710 } 711 712 return 1; 713 } 714 715 pmd_t *populate_extra_pmd(unsigned long vaddr); 716 pte_t *populate_extra_pte(unsigned long vaddr); 717 718 #ifdef CONFIG_PAGE_TABLE_ISOLATION 719 pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd); 720 721 /* 722 * Take a PGD location (pgdp) and a pgd value that needs to be set there. 723 * Populates the user and returns the resulting PGD that must be set in 724 * the kernel copy of the page tables. 725 */ 726 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd) 727 { 728 if (!static_cpu_has(X86_FEATURE_PTI)) 729 return pgd; 730 return __pti_set_user_pgtbl(pgdp, pgd); 731 } 732 #else /* CONFIG_PAGE_TABLE_ISOLATION */ 733 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd) 734 { 735 return pgd; 736 } 737 #endif /* CONFIG_PAGE_TABLE_ISOLATION */ 738 739 #endif /* __ASSEMBLY__ */ 740 741 742 #ifdef CONFIG_X86_32 743 # include <asm/pgtable_32.h> 744 #else 745 # include <asm/pgtable_64.h> 746 #endif 747 748 #ifndef __ASSEMBLY__ 749 #include <linux/mm_types.h> 750 #include <linux/mmdebug.h> 751 #include <linux/log2.h> 752 #include <asm/fixmap.h> 753 754 static inline int pte_none(pte_t pte) 755 { 756 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK)); 757 } 758 759 #define __HAVE_ARCH_PTE_SAME 760 static inline int pte_same(pte_t a, pte_t b) 761 { 762 return a.pte == b.pte; 763 } 764 765 static inline int pte_present(pte_t a) 766 { 767 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE); 768 } 769 770 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP 771 static inline int pte_devmap(pte_t a) 772 { 773 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP; 774 } 775 #endif 776 777 #define pte_accessible pte_accessible 778 static inline bool pte_accessible(struct mm_struct *mm, pte_t a) 779 { 780 if (pte_flags(a) & _PAGE_PRESENT) 781 return true; 782 783 if ((pte_flags(a) & _PAGE_PROTNONE) && 784 mm_tlb_flush_pending(mm)) 785 return true; 786 787 return false; 788 } 789 790 static inline int pmd_present(pmd_t pmd) 791 { 792 /* 793 * Checking for _PAGE_PSE is needed too because 794 * split_huge_page will temporarily clear the present bit (but 795 * the _PAGE_PSE flag will remain set at all times while the 796 * _PAGE_PRESENT bit is clear). 797 */ 798 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE); 799 } 800 801 #ifdef CONFIG_NUMA_BALANCING 802 /* 803 * These work without NUMA balancing but the kernel does not care. See the 804 * comment in include/linux/pgtable.h 805 */ 806 static inline int pte_protnone(pte_t pte) 807 { 808 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT)) 809 == _PAGE_PROTNONE; 810 } 811 812 static inline int pmd_protnone(pmd_t pmd) 813 { 814 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT)) 815 == _PAGE_PROTNONE; 816 } 817 #endif /* CONFIG_NUMA_BALANCING */ 818 819 static inline int pmd_none(pmd_t pmd) 820 { 821 /* Only check low word on 32-bit platforms, since it might be 822 out of sync with upper half. */ 823 unsigned long val = native_pmd_val(pmd); 824 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0; 825 } 826 827 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 828 { 829 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd)); 830 } 831 832 /* 833 * Currently stuck as a macro due to indirect forward reference to 834 * linux/mmzone.h's __section_mem_map_addr() definition: 835 */ 836 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd)) 837 838 /* 839 * Conversion functions: convert a page and protection to a page entry, 840 * and a page entry and page directory to the page they refer to. 841 * 842 * (Currently stuck as a macro because of indirect forward reference 843 * to linux/mm.h:page_to_nid()) 844 */ 845 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 846 847 static inline int pmd_bad(pmd_t pmd) 848 { 849 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE; 850 } 851 852 static inline unsigned long pages_to_mb(unsigned long npg) 853 { 854 return npg >> (20 - PAGE_SHIFT); 855 } 856 857 #if CONFIG_PGTABLE_LEVELS > 2 858 static inline int pud_none(pud_t pud) 859 { 860 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0; 861 } 862 863 static inline int pud_present(pud_t pud) 864 { 865 return pud_flags(pud) & _PAGE_PRESENT; 866 } 867 868 static inline unsigned long pud_page_vaddr(pud_t pud) 869 { 870 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud)); 871 } 872 873 /* 874 * Currently stuck as a macro due to indirect forward reference to 875 * linux/mmzone.h's __section_mem_map_addr() definition: 876 */ 877 #define pud_page(pud) pfn_to_page(pud_pfn(pud)) 878 879 #define pud_leaf pud_large 880 static inline int pud_large(pud_t pud) 881 { 882 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) == 883 (_PAGE_PSE | _PAGE_PRESENT); 884 } 885 886 static inline int pud_bad(pud_t pud) 887 { 888 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0; 889 } 890 #else 891 #define pud_leaf pud_large 892 static inline int pud_large(pud_t pud) 893 { 894 return 0; 895 } 896 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 897 898 #if CONFIG_PGTABLE_LEVELS > 3 899 static inline int p4d_none(p4d_t p4d) 900 { 901 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0; 902 } 903 904 static inline int p4d_present(p4d_t p4d) 905 { 906 return p4d_flags(p4d) & _PAGE_PRESENT; 907 } 908 909 static inline unsigned long p4d_page_vaddr(p4d_t p4d) 910 { 911 return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d)); 912 } 913 914 /* 915 * Currently stuck as a macro due to indirect forward reference to 916 * linux/mmzone.h's __section_mem_map_addr() definition: 917 */ 918 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d)) 919 920 static inline int p4d_bad(p4d_t p4d) 921 { 922 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER; 923 924 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) 925 ignore_flags |= _PAGE_NX; 926 927 return (p4d_flags(p4d) & ~ignore_flags) != 0; 928 } 929 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 930 931 static inline unsigned long p4d_index(unsigned long address) 932 { 933 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1); 934 } 935 936 #if CONFIG_PGTABLE_LEVELS > 4 937 static inline int pgd_present(pgd_t pgd) 938 { 939 if (!pgtable_l5_enabled()) 940 return 1; 941 return pgd_flags(pgd) & _PAGE_PRESENT; 942 } 943 944 static inline unsigned long pgd_page_vaddr(pgd_t pgd) 945 { 946 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK); 947 } 948 949 /* 950 * Currently stuck as a macro due to indirect forward reference to 951 * linux/mmzone.h's __section_mem_map_addr() definition: 952 */ 953 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd)) 954 955 /* to find an entry in a page-table-directory. */ 956 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) 957 { 958 if (!pgtable_l5_enabled()) 959 return (p4d_t *)pgd; 960 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address); 961 } 962 963 static inline int pgd_bad(pgd_t pgd) 964 { 965 unsigned long ignore_flags = _PAGE_USER; 966 967 if (!pgtable_l5_enabled()) 968 return 0; 969 970 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) 971 ignore_flags |= _PAGE_NX; 972 973 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE; 974 } 975 976 static inline int pgd_none(pgd_t pgd) 977 { 978 if (!pgtable_l5_enabled()) 979 return 0; 980 /* 981 * There is no need to do a workaround for the KNL stray 982 * A/D bit erratum here. PGDs only point to page tables 983 * except on 32-bit non-PAE which is not supported on 984 * KNL. 985 */ 986 return !native_pgd_val(pgd); 987 } 988 #endif /* CONFIG_PGTABLE_LEVELS > 4 */ 989 990 #endif /* __ASSEMBLY__ */ 991 992 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET) 993 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY) 994 995 #ifndef __ASSEMBLY__ 996 997 extern int direct_gbpages; 998 void init_mem_mapping(void); 999 void early_alloc_pgt_buf(void); 1000 extern void memblock_find_dma_reserve(void); 1001 void __init poking_init(void); 1002 unsigned long init_memory_mapping(unsigned long start, 1003 unsigned long end, pgprot_t prot); 1004 1005 #ifdef CONFIG_X86_64 1006 extern pgd_t trampoline_pgd_entry; 1007 #endif 1008 1009 /* local pte updates need not use xchg for locking */ 1010 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) 1011 { 1012 pte_t res = *ptep; 1013 1014 /* Pure native function needs no input for mm, addr */ 1015 native_pte_clear(NULL, 0, ptep); 1016 return res; 1017 } 1018 1019 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp) 1020 { 1021 pmd_t res = *pmdp; 1022 1023 native_pmd_clear(pmdp); 1024 return res; 1025 } 1026 1027 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp) 1028 { 1029 pud_t res = *pudp; 1030 1031 native_pud_clear(pudp); 1032 return res; 1033 } 1034 1035 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 1036 pte_t *ptep, pte_t pte) 1037 { 1038 set_pte(ptep, pte); 1039 } 1040 1041 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, 1042 pmd_t *pmdp, pmd_t pmd) 1043 { 1044 set_pmd(pmdp, pmd); 1045 } 1046 1047 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr, 1048 pud_t *pudp, pud_t pud) 1049 { 1050 native_set_pud(pudp, pud); 1051 } 1052 1053 /* 1054 * We only update the dirty/accessed state if we set 1055 * the dirty bit by hand in the kernel, since the hardware 1056 * will do the accessed bit for us, and we don't want to 1057 * race with other CPU's that might be updating the dirty 1058 * bit at the same time. 1059 */ 1060 struct vm_area_struct; 1061 1062 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 1063 extern int ptep_set_access_flags(struct vm_area_struct *vma, 1064 unsigned long address, pte_t *ptep, 1065 pte_t entry, int dirty); 1066 1067 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 1068 extern int ptep_test_and_clear_young(struct vm_area_struct *vma, 1069 unsigned long addr, pte_t *ptep); 1070 1071 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 1072 extern int ptep_clear_flush_young(struct vm_area_struct *vma, 1073 unsigned long address, pte_t *ptep); 1074 1075 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 1076 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 1077 pte_t *ptep) 1078 { 1079 pte_t pte = native_ptep_get_and_clear(ptep); 1080 return pte; 1081 } 1082 1083 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL 1084 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, 1085 unsigned long addr, pte_t *ptep, 1086 int full) 1087 { 1088 pte_t pte; 1089 if (full) { 1090 /* 1091 * Full address destruction in progress; paravirt does not 1092 * care about updates and native needs no locking 1093 */ 1094 pte = native_local_ptep_get_and_clear(ptep); 1095 } else { 1096 pte = ptep_get_and_clear(mm, addr, ptep); 1097 } 1098 return pte; 1099 } 1100 1101 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 1102 static inline void ptep_set_wrprotect(struct mm_struct *mm, 1103 unsigned long addr, pte_t *ptep) 1104 { 1105 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte); 1106 } 1107 1108 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0) 1109 1110 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot)) 1111 1112 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS 1113 extern int pmdp_set_access_flags(struct vm_area_struct *vma, 1114 unsigned long address, pmd_t *pmdp, 1115 pmd_t entry, int dirty); 1116 extern int pudp_set_access_flags(struct vm_area_struct *vma, 1117 unsigned long address, pud_t *pudp, 1118 pud_t entry, int dirty); 1119 1120 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 1121 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, 1122 unsigned long addr, pmd_t *pmdp); 1123 extern int pudp_test_and_clear_young(struct vm_area_struct *vma, 1124 unsigned long addr, pud_t *pudp); 1125 1126 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH 1127 extern int pmdp_clear_flush_young(struct vm_area_struct *vma, 1128 unsigned long address, pmd_t *pmdp); 1129 1130 1131 #define pmd_write pmd_write 1132 static inline int pmd_write(pmd_t pmd) 1133 { 1134 return pmd_flags(pmd) & _PAGE_RW; 1135 } 1136 1137 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 1138 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr, 1139 pmd_t *pmdp) 1140 { 1141 return native_pmdp_get_and_clear(pmdp); 1142 } 1143 1144 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR 1145 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, 1146 unsigned long addr, pud_t *pudp) 1147 { 1148 return native_pudp_get_and_clear(pudp); 1149 } 1150 1151 #define __HAVE_ARCH_PMDP_SET_WRPROTECT 1152 static inline void pmdp_set_wrprotect(struct mm_struct *mm, 1153 unsigned long addr, pmd_t *pmdp) 1154 { 1155 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp); 1156 } 1157 1158 #define pud_write pud_write 1159 static inline int pud_write(pud_t pud) 1160 { 1161 return pud_flags(pud) & _PAGE_RW; 1162 } 1163 1164 #ifndef pmdp_establish 1165 #define pmdp_establish pmdp_establish 1166 static inline pmd_t pmdp_establish(struct vm_area_struct *vma, 1167 unsigned long address, pmd_t *pmdp, pmd_t pmd) 1168 { 1169 if (IS_ENABLED(CONFIG_SMP)) { 1170 return xchg(pmdp, pmd); 1171 } else { 1172 pmd_t old = *pmdp; 1173 WRITE_ONCE(*pmdp, pmd); 1174 return old; 1175 } 1176 } 1177 #endif 1178 /* 1179 * Page table pages are page-aligned. The lower half of the top 1180 * level is used for userspace and the top half for the kernel. 1181 * 1182 * Returns true for parts of the PGD that map userspace and 1183 * false for the parts that map the kernel. 1184 */ 1185 static inline bool pgdp_maps_userspace(void *__ptr) 1186 { 1187 unsigned long ptr = (unsigned long)__ptr; 1188 1189 return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START); 1190 } 1191 1192 #define pgd_leaf pgd_large 1193 static inline int pgd_large(pgd_t pgd) { return 0; } 1194 1195 #ifdef CONFIG_PAGE_TABLE_ISOLATION 1196 /* 1197 * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages 1198 * (8k-aligned and 8k in size). The kernel one is at the beginning 4k and 1199 * the user one is in the last 4k. To switch between them, you 1200 * just need to flip the 12th bit in their addresses. 1201 */ 1202 #define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT 1203 1204 /* 1205 * This generates better code than the inline assembly in 1206 * __set_bit(). 1207 */ 1208 static inline void *ptr_set_bit(void *ptr, int bit) 1209 { 1210 unsigned long __ptr = (unsigned long)ptr; 1211 1212 __ptr |= BIT(bit); 1213 return (void *)__ptr; 1214 } 1215 static inline void *ptr_clear_bit(void *ptr, int bit) 1216 { 1217 unsigned long __ptr = (unsigned long)ptr; 1218 1219 __ptr &= ~BIT(bit); 1220 return (void *)__ptr; 1221 } 1222 1223 static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp) 1224 { 1225 return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT); 1226 } 1227 1228 static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp) 1229 { 1230 return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT); 1231 } 1232 1233 static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp) 1234 { 1235 return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT); 1236 } 1237 1238 static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp) 1239 { 1240 return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT); 1241 } 1242 #endif /* CONFIG_PAGE_TABLE_ISOLATION */ 1243 1244 /* 1245 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); 1246 * 1247 * dst - pointer to pgd range anwhere on a pgd page 1248 * src - "" 1249 * count - the number of pgds to copy. 1250 * 1251 * dst and src can be on the same page, but the range must not overlap, 1252 * and must not cross a page boundary. 1253 */ 1254 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) 1255 { 1256 memcpy(dst, src, count * sizeof(pgd_t)); 1257 #ifdef CONFIG_PAGE_TABLE_ISOLATION 1258 if (!static_cpu_has(X86_FEATURE_PTI)) 1259 return; 1260 /* Clone the user space pgd as well */ 1261 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src), 1262 count * sizeof(pgd_t)); 1263 #endif 1264 } 1265 1266 #define PTE_SHIFT ilog2(PTRS_PER_PTE) 1267 static inline int page_level_shift(enum pg_level level) 1268 { 1269 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT; 1270 } 1271 static inline unsigned long page_level_size(enum pg_level level) 1272 { 1273 return 1UL << page_level_shift(level); 1274 } 1275 static inline unsigned long page_level_mask(enum pg_level level) 1276 { 1277 return ~(page_level_size(level) - 1); 1278 } 1279 1280 /* 1281 * The x86 doesn't have any external MMU info: the kernel page 1282 * tables contain all the necessary information. 1283 */ 1284 static inline void update_mmu_cache(struct vm_area_struct *vma, 1285 unsigned long addr, pte_t *ptep) 1286 { 1287 } 1288 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 1289 unsigned long addr, pmd_t *pmd) 1290 { 1291 } 1292 static inline void update_mmu_cache_pud(struct vm_area_struct *vma, 1293 unsigned long addr, pud_t *pud) 1294 { 1295 } 1296 1297 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 1298 static inline pte_t pte_swp_mksoft_dirty(pte_t pte) 1299 { 1300 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY); 1301 } 1302 1303 static inline int pte_swp_soft_dirty(pte_t pte) 1304 { 1305 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY; 1306 } 1307 1308 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) 1309 { 1310 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY); 1311 } 1312 1313 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION 1314 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) 1315 { 1316 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY); 1317 } 1318 1319 static inline int pmd_swp_soft_dirty(pmd_t pmd) 1320 { 1321 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY; 1322 } 1323 1324 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) 1325 { 1326 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY); 1327 } 1328 #endif 1329 #endif 1330 1331 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP 1332 static inline pte_t pte_swp_mkuffd_wp(pte_t pte) 1333 { 1334 return pte_set_flags(pte, _PAGE_SWP_UFFD_WP); 1335 } 1336 1337 static inline int pte_swp_uffd_wp(pte_t pte) 1338 { 1339 return pte_flags(pte) & _PAGE_SWP_UFFD_WP; 1340 } 1341 1342 static inline pte_t pte_swp_clear_uffd_wp(pte_t pte) 1343 { 1344 return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP); 1345 } 1346 1347 static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd) 1348 { 1349 return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP); 1350 } 1351 1352 static inline int pmd_swp_uffd_wp(pmd_t pmd) 1353 { 1354 return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP; 1355 } 1356 1357 static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd) 1358 { 1359 return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP); 1360 } 1361 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */ 1362 1363 #define PKRU_AD_BIT 0x1 1364 #define PKRU_WD_BIT 0x2 1365 #define PKRU_BITS_PER_PKEY 2 1366 1367 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS 1368 extern u32 init_pkru_value; 1369 #else 1370 #define init_pkru_value 0 1371 #endif 1372 1373 static inline bool __pkru_allows_read(u32 pkru, u16 pkey) 1374 { 1375 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY; 1376 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits)); 1377 } 1378 1379 static inline bool __pkru_allows_write(u32 pkru, u16 pkey) 1380 { 1381 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY; 1382 /* 1383 * Access-disable disables writes too so we need to check 1384 * both bits here. 1385 */ 1386 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits)); 1387 } 1388 1389 static inline u16 pte_flags_pkey(unsigned long pte_flags) 1390 { 1391 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS 1392 /* ifdef to avoid doing 59-bit shift on 32-bit values */ 1393 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0; 1394 #else 1395 return 0; 1396 #endif 1397 } 1398 1399 static inline bool __pkru_allows_pkey(u16 pkey, bool write) 1400 { 1401 u32 pkru = read_pkru(); 1402 1403 if (!__pkru_allows_read(pkru, pkey)) 1404 return false; 1405 if (write && !__pkru_allows_write(pkru, pkey)) 1406 return false; 1407 1408 return true; 1409 } 1410 1411 /* 1412 * 'pteval' can come from a PTE, PMD or PUD. We only check 1413 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the 1414 * same value on all 3 types. 1415 */ 1416 static inline bool __pte_access_permitted(unsigned long pteval, bool write) 1417 { 1418 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER; 1419 1420 if (write) 1421 need_pte_bits |= _PAGE_RW; 1422 1423 if ((pteval & need_pte_bits) != need_pte_bits) 1424 return 0; 1425 1426 return __pkru_allows_pkey(pte_flags_pkey(pteval), write); 1427 } 1428 1429 #define pte_access_permitted pte_access_permitted 1430 static inline bool pte_access_permitted(pte_t pte, bool write) 1431 { 1432 return __pte_access_permitted(pte_val(pte), write); 1433 } 1434 1435 #define pmd_access_permitted pmd_access_permitted 1436 static inline bool pmd_access_permitted(pmd_t pmd, bool write) 1437 { 1438 return __pte_access_permitted(pmd_val(pmd), write); 1439 } 1440 1441 #define pud_access_permitted pud_access_permitted 1442 static inline bool pud_access_permitted(pud_t pud, bool write) 1443 { 1444 return __pte_access_permitted(pud_val(pud), write); 1445 } 1446 1447 #define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1 1448 extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot); 1449 1450 static inline bool arch_has_pfn_modify_check(void) 1451 { 1452 return boot_cpu_has_bug(X86_BUG_L1TF); 1453 } 1454 1455 #define arch_faults_on_old_pte arch_faults_on_old_pte 1456 static inline bool arch_faults_on_old_pte(void) 1457 { 1458 return false; 1459 } 1460 1461 #endif /* __ASSEMBLY__ */ 1462 1463 #endif /* _ASM_X86_PGTABLE_H */ 1464