diff options
| -rw-r--r-- | arch/riscv/mm/pageattr.c | 270 |
1 files changed, 230 insertions, 40 deletions
diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c index 161d0b34c2cb..fc5fc4f785c4 100644 --- a/arch/riscv/mm/pageattr.c +++ b/arch/riscv/mm/pageattr.c @@ -5,6 +5,7 @@ #include <linux/pagewalk.h> #include <linux/pgtable.h> +#include <linux/vmalloc.h> #include <asm/tlbflush.h> #include <asm/bitops.h> #include <asm/set_memory.h> @@ -25,19 +26,6 @@ static unsigned long set_pageattr_masks(unsigned long val, struct mm_walk *walk) return new_val; } -static int pageattr_pgd_entry(pgd_t *pgd, unsigned long addr, - unsigned long next, struct mm_walk *walk) -{ - pgd_t val = READ_ONCE(*pgd); - - if (pgd_leaf(val)) { - val = __pgd(set_pageattr_masks(pgd_val(val), walk)); - set_pgd(pgd, val); - } - - return 0; -} - static int pageattr_p4d_entry(p4d_t *p4d, unsigned long addr, unsigned long next, struct mm_walk *walk) { @@ -96,7 +84,6 @@ static int pageattr_pte_hole(unsigned long addr, unsigned long next, } static const struct mm_walk_ops pageattr_ops = { - .pgd_entry = pageattr_pgd_entry, .p4d_entry = pageattr_p4d_entry, .pud_entry = pageattr_pud_entry, .pmd_entry = pageattr_pmd_entry, @@ -105,12 +92,181 @@ static const struct mm_walk_ops pageattr_ops = { .walk_lock = PGWALK_RDLOCK, }; +#ifdef CONFIG_64BIT +static int __split_linear_mapping_pmd(pud_t *pudp, + unsigned long vaddr, unsigned long end) +{ + pmd_t *pmdp; + unsigned long next; + + pmdp = pmd_offset(pudp, vaddr); + + do { + next = pmd_addr_end(vaddr, end); + + if (next - vaddr >= PMD_SIZE && + vaddr <= (vaddr & PMD_MASK) && end >= next) + continue; + + if (pmd_leaf(*pmdp)) { + struct page *pte_page; + unsigned long pfn = _pmd_pfn(*pmdp); + pgprot_t prot = __pgprot(pmd_val(*pmdp) & ~_PAGE_PFN_MASK); + pte_t *ptep_new; + int i; + + pte_page = alloc_page(GFP_KERNEL); + if (!pte_page) + return -ENOMEM; + + ptep_new = (pte_t *)page_address(pte_page); + for (i = 0; i < PTRS_PER_PTE; ++i, ++ptep_new) + set_pte(ptep_new, pfn_pte(pfn + i, prot)); + + smp_wmb(); + + set_pmd(pmdp, pfn_pmd(page_to_pfn(pte_page), PAGE_TABLE)); + } + } while (pmdp++, vaddr = next, vaddr != end); + + return 0; +} + +static int __split_linear_mapping_pud(p4d_t *p4dp, + unsigned long vaddr, unsigned long end) +{ + pud_t *pudp; + unsigned long next; + int ret; + + pudp = pud_offset(p4dp, vaddr); + + do { + next = pud_addr_end(vaddr, end); + + if (next - vaddr >= PUD_SIZE && + vaddr <= (vaddr & PUD_MASK) && end >= next) + continue; + + if (pud_leaf(*pudp)) { + struct page *pmd_page; + unsigned long pfn = _pud_pfn(*pudp); + pgprot_t prot = __pgprot(pud_val(*pudp) & ~_PAGE_PFN_MASK); + pmd_t *pmdp_new; + int i; + + pmd_page = alloc_page(GFP_KERNEL); + if (!pmd_page) + return -ENOMEM; + + pmdp_new = (pmd_t *)page_address(pmd_page); + for (i = 0; i < PTRS_PER_PMD; ++i, ++pmdp_new) + set_pmd(pmdp_new, + pfn_pmd(pfn + ((i * PMD_SIZE) >> PAGE_SHIFT), prot)); + + smp_wmb(); + + set_pud(pudp, pfn_pud(page_to_pfn(pmd_page), PAGE_TABLE)); + } + + ret = __split_linear_mapping_pmd(pudp, vaddr, next); + if (ret) + return ret; + } while (pudp++, vaddr = next, vaddr != end); + + return 0; +} + +static int __split_linear_mapping_p4d(pgd_t *pgdp, + unsigned long vaddr, unsigned long end) +{ + p4d_t *p4dp; + unsigned long next; + int ret; + + p4dp = p4d_offset(pgdp, vaddr); + + do { + next = p4d_addr_end(vaddr, end); + + /* + * If [vaddr; end] contains [vaddr & P4D_MASK; next], we don't + * need to split, we'll change the protections on the whole P4D. + */ + if (next - vaddr >= P4D_SIZE && + vaddr <= (vaddr & P4D_MASK) && end >= next) + continue; + + if (p4d_leaf(*p4dp)) { + struct page *pud_page; + unsigned long pfn = _p4d_pfn(*p4dp); + pgprot_t prot = __pgprot(p4d_val(*p4dp) & ~_PAGE_PFN_MASK); + pud_t *pudp_new; + int i; + + pud_page = alloc_page(GFP_KERNEL); + if (!pud_page) + return -ENOMEM; + + /* + * Fill the pud level with leaf puds that have the same + * protections as the leaf p4d. + */ + pudp_new = (pud_t *)page_address(pud_page); + for (i = 0; i < PTRS_PER_PUD; ++i, ++pudp_new) + set_pud(pudp_new, + pfn_pud(pfn + ((i * PUD_SIZE) >> PAGE_SHIFT), prot)); + + /* + * Make sure the pud filling is not reordered with the + * p4d store which could result in seeing a partially + * filled pud level. + */ + smp_wmb(); + + set_p4d(p4dp, pfn_p4d(page_to_pfn(pud_page), PAGE_TABLE)); + } + + ret = __split_linear_mapping_pud(p4dp, vaddr, next); + if (ret) + return ret; + } while (p4dp++, vaddr = next, vaddr != end); + + return 0; +} + +static int __split_linear_mapping_pgd(pgd_t *pgdp, + unsigned long vaddr, + unsigned long end) +{ + unsigned long next; + int ret; + + do { + next = pgd_addr_end(vaddr, end); + /* We never use PGD mappings for the linear mapping */ + ret = __split_linear_mapping_p4d(pgdp, vaddr, next); + if (ret) + return ret; + } while (pgdp++, vaddr = next, vaddr != end); + + return 0; +} + +static int split_linear_mapping(unsigned long start, unsigned long end) +{ + return __split_linear_mapping_pgd(pgd_offset_k(start), start, end); +} +#endif /* CONFIG_64BIT */ + static int __set_memory(unsigned long addr, int numpages, pgprot_t set_mask, pgprot_t clear_mask) { int ret; unsigned long start = addr; unsigned long end = start + PAGE_SIZE * numpages; + unsigned long __maybe_unused lm_start; + unsigned long __maybe_unused lm_end; struct pageattr_masks masks = { .set_mask = set_mask, .clear_mask = clear_mask @@ -120,11 +276,67 @@ static int __set_memory(unsigned long addr, int numpages, pgprot_t set_mask, return 0; mmap_write_lock(&init_mm); + +#ifdef CONFIG_64BIT + /* + * We are about to change the permissions of a kernel mapping, we must + * apply the same changes to its linear mapping alias, which may imply + * splitting a huge mapping. + */ + + if (is_vmalloc_or_module_addr((void *)start)) { + struct vm_struct *area = NULL; + int i, page_start; + + area = find_vm_area((void *)start); + page_start = (start - (unsigned long)area->addr) >> PAGE_SHIFT; + + for (i = page_start; i < page_start + numpages; ++i) { + lm_start = (unsigned long)page_address(area->pages[i]); + lm_end = lm_start + PAGE_SIZE; + + ret = split_linear_mapping(lm_start, lm_end); + if (ret) + goto unlock; + + ret = walk_page_range_novma(&init_mm, lm_start, lm_end, + &pageattr_ops, NULL, &masks); + if (ret) + goto unlock; + } + } else if (is_kernel_mapping(start) || is_linear_mapping(start)) { + lm_start = (unsigned long)lm_alias(start); + lm_end = (unsigned long)lm_alias(end); + + ret = split_linear_mapping(lm_start, lm_end); + if (ret) + goto unlock; + + ret = walk_page_range_novma(&init_mm, lm_start, lm_end, + &pageattr_ops, NULL, &masks); + if (ret) + goto unlock; + } + ret = walk_page_range_novma(&init_mm, start, end, &pageattr_ops, NULL, &masks); + +unlock: + mmap_write_unlock(&init_mm); + + /* + * We can't use flush_tlb_kernel_range() here as we may have split a + * hugepage that is larger than that, so let's flush everything. + */ + flush_tlb_all(); +#else + ret = walk_page_range_novma(&init_mm, start, end, &pageattr_ops, NULL, + &masks); + mmap_write_unlock(&init_mm); flush_tlb_kernel_range(start, end); +#endif return ret; } @@ -159,36 +371,14 @@ int set_memory_nx(unsigned long addr, int numpages) int set_direct_map_invalid_noflush(struct page *page) { - int ret; - unsigned long start = (unsigned long)page_address(page); - unsigned long end = start + PAGE_SIZE; - struct pageattr_masks masks = { - .set_mask = __pgprot(0), - .clear_mask = __pgprot(_PAGE_PRESENT) - }; - - mmap_read_lock(&init_mm); - ret = walk_page_range(&init_mm, start, end, &pageattr_ops, &masks); - mmap_read_unlock(&init_mm); - - return ret; + return __set_memory((unsigned long)page_address(page), 1, + __pgprot(0), __pgprot(_PAGE_PRESENT)); } int set_direct_map_default_noflush(struct page *page) { - int ret; - unsigned long start = (unsigned long)page_address(page); - unsigned long end = start + PAGE_SIZE; - struct pageattr_masks masks = { - .set_mask = PAGE_KERNEL, - .clear_mask = __pgprot(0) - }; - - mmap_read_lock(&init_mm); - ret = walk_page_range(&init_mm, start, end, &pageattr_ops, &masks); - mmap_read_unlock(&init_mm); - - return ret; + return __set_memory((unsigned long)page_address(page), 1, + PAGE_KERNEL, __pgprot(0)); } #ifdef CONFIG_DEBUG_PAGEALLOC |