[5/5] riscv: Use accessors to page table entries instead of direct dereference

Message ID	20231002151031.110551-6-alexghiti@rivosinc.com
State	New
Headers	show Return-Path: <linux-efi-owner@vger.kernel.org> From: Alexandre Ghiti <alexghiti@rivosinc.com> To: Ryan Roberts <ryan.roberts@arm.com>, Alexander Potapenko <glider@google.com>, Marco Elver <elver@google.com>, Dmitry Vyukov <dvyukov@google.com>, Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Anup Patel <anup@brainfault.org>, Atish Patra <atishp@atishpatra.org>, Ard Biesheuvel <ardb@kernel.org>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, Andrey Konovalov <andreyknvl@gmail.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, kasan-dev@googlegroups.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-efi@vger.kernel.org, linux-mm@kvack.org Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Subject: [PATCH 5/5] riscv: Use accessors to page table entries instead of direct dereference Date: Mon, 2 Oct 2023 17:10:31 +0200 Message-Id: <20231002151031.110551-6-alexghiti@rivosinc.com> In-Reply-To: <20231002151031.110551-1-alexghiti@rivosinc.com> References: <20231002151031.110551-1-alexghiti@rivosinc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	riscv: Use READ_ONCE()/WRITE_ONCE() for pte accesses \| expand [0/5] riscv: Use READ_ONCE()/WRITE_ONCE() for pte accesses [1/5] riscv: Use WRITE_ONCE() when setting page table entries [2/5] mm: Introduce pudp/p4dp/pgdp_get() functions [3/5] riscv: mm: Only compile pgtable.c if MMU [4/5] riscv: Suffix all page table entry pointers with 'p' [5/5] riscv: Use accessors to page table entries instead of direct dereference

diff --git a/arch/riscv/include/asm/kfence.h b/arch/riscv/include/asm/kfence.h index 3b482d0a4633..1ed91e379723 100644 --- a/arch/riscv/include/asm/kfence.h +++ b/arch/riscv/include/asm/kfence.h @@ -18,9 +18,9 @@ static inline bool kfence_protect_page(unsigned long addr, bool protect) pte_t *ptep = virt_to_kpte(addr); if (protect) - set_pte(ptep, __pte(pte_val(*ptep) & ~_PAGE_PRESENT)); + set_pte(ptep, __pte(pte_val(ptep_get(ptep)) & ~_PAGE_PRESENT)); else - set_pte(ptep, __pte(pte_val(*ptep) | _PAGE_PRESENT)); + set_pte(ptep, __pte(pte_val(ptep_get(ptep)) | _PAGE_PRESENT)); flush_tlb_kernel_range(addr, addr + PAGE_SIZE); diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index b820775f4973..8d2370ca9909 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -543,19 +543,12 @@ static inline void pte_clear(struct mm_struct *mm, __set_pte_at(ptep, __pte(0)); } -#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS -static inline int ptep_set_access_flags(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep, - pte_t entry, int dirty) -{ - if (!pte_same(*ptep, entry)) - __set_pte_at(ptep, entry); - /* - * update_mmu_cache will unconditionally execute, handling both - * the case that the PTE changed and the spurious fault case. - */ - return true; -} +#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS /* defined in mm/pgtable.c */ +extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address, + pte_t *ptep, pte_t entry, int dirty); +#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG /* defined in mm/pgtable.c */ +extern int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, + pte_t *ptep); #define __HAVE_ARCH_PTEP_GET_AND_CLEAR static inline pte_t ptep_get_and_clear(struct mm_struct *mm, @@ -568,16 +561,6 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, return pte; } -#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG -static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, - pte_t *ptep) -{ - if (!pte_young(*ptep)) - return 0; - return test_and_clear_bit(_PAGE_ACCESSED_OFFSET, &pte_val(*ptep)); -} - #define __HAVE_ARCH_PTEP_SET_WRPROTECT static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) diff --git a/arch/riscv/kernel/efi.c b/arch/riscv/kernel/efi.c index aa6209a74c83..b64bf1624a05 100644 --- a/arch/riscv/kernel/efi.c +++ b/arch/riscv/kernel/efi.c @@ -60,7 +60,7 @@ int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md) static int __init set_permissions(pte_t *ptep, unsigned long addr, void *data) { efi_memory_desc_t *md = data; - pte_t pte = READ_ONCE(*ptep); + pte_t pte = ptep_get(ptep); unsigned long val; if (md->attribute & EFI_MEMORY_RO) { diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c index 35db276bf0c2..8d249877f9d8 100644 --- a/arch/riscv/kvm/mmu.c +++ b/arch/riscv/kvm/mmu.c @@ -103,7 +103,7 @@ static bool gstage_get_leaf_entry(struct kvm *kvm, gpa_t addr, *ptep_level = current_level; ptep = (pte_t *)kvm->arch.pgdp; ptep = &ptep[gstage_pte_index(addr, current_level)]; - while (ptep && pte_val(*ptep)) { + while (ptep && pte_val(ptep_get(ptep))) { if (gstage_pte_leaf(ptep)) { *ptep_level = current_level; *ptepp = ptep; @@ -113,7 +113,7 @@ static bool gstage_get_leaf_entry(struct kvm *kvm, gpa_t addr, if (current_level) { current_level--; *ptep_level = current_level; - ptep = (pte_t *)gstage_pte_page_vaddr(*ptep); + ptep = (pte_t *)gstage_pte_page_vaddr(ptep_get(ptep)); ptep = &ptep[gstage_pte_index(addr, current_level)]; } else { ptep = NULL; @@ -149,25 +149,25 @@ static int gstage_set_pte(struct kvm *kvm, u32 level, if (gstage_pte_leaf(ptep)) return -EEXIST; - if (!pte_val(*ptep)) { + if (!pte_val(ptep_get(ptep))) { if (!pcache) return -ENOMEM; next_ptep = kvm_mmu_memory_cache_alloc(pcache); if (!next_ptep) return -ENOMEM; - *ptep = pfn_pte(PFN_DOWN(__pa(next_ptep)), - __pgprot(_PAGE_TABLE)); + set_pte(ptep, pfn_pte(PFN_DOWN(__pa(next_ptep)), + __pgprot(_PAGE_TABLE))); } else { if (gstage_pte_leaf(ptep)) return -EEXIST; - next_ptep = (pte_t *)gstage_pte_page_vaddr(*ptep); + next_ptep = (pte_t *)gstage_pte_page_vaddr(ptep_get(ptep)); } current_level--; ptep = &next_ptep[gstage_pte_index(addr, current_level)]; } - *ptep = *new_pte; + set_pte(ptep, *new_pte); if (gstage_pte_leaf(ptep)) gstage_remote_tlb_flush(kvm, current_level, addr); @@ -239,11 +239,11 @@ static void gstage_op_pte(struct kvm *kvm, gpa_t addr, BUG_ON(addr & (page_size - 1)); - if (!pte_val(*ptep)) + if (!pte_val(ptep_get(ptep))) return; if (ptep_level && !gstage_pte_leaf(ptep)) { - next_ptep = (pte_t *)gstage_pte_page_vaddr(*ptep); + next_ptep = (pte_t *)gstage_pte_page_vaddr(ptep_get(ptep)); next_ptep_level = ptep_level - 1; ret = gstage_level_to_page_size(next_ptep_level, &next_page_size); @@ -261,7 +261,7 @@ static void gstage_op_pte(struct kvm *kvm, gpa_t addr, if (op == GSTAGE_OP_CLEAR) set_pte(ptep, __pte(0)); else if (op == GSTAGE_OP_WP) - set_pte(ptep, __pte(pte_val(*ptep) & ~_PAGE_WRITE)); + set_pte(ptep, __pte(pte_val(ptep_get(ptep)) & ~_PAGE_WRITE)); gstage_remote_tlb_flush(kvm, ptep_level, addr); } } @@ -603,7 +603,7 @@ bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) &ptep, &ptep_level)) return false; - return pte_young(*ptep); + return pte_young(ptep_get(ptep)); } int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu, diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 6284ef4b644a..24c826746322 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -136,24 +136,24 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a pgdp = (pgd_t *)pfn_to_virt(pfn) + index; pgdp_k = init_mm.pgd + index; - if (!pgd_present(*pgdp_k)) { + if (!pgd_present(pgdp_get(pgdp_k))) { no_context(regs, addr); return; } - set_pgd(pgdp, *pgdp_k); + set_pgd(pgdp, pgdp_get(pgdp_k)); p4dp_k = p4d_offset(pgdp_k, addr); - if (!p4d_present(*p4dp_k)) { + if (!p4d_present(p4dp_get(p4dp_k))) { no_context(regs, addr); return; } pudp_k = pud_offset(p4dp_k, addr); - if (!pud_present(*pudp_k)) { + if (!pud_present(pudp_get(pudp_k))) { no_context(regs, addr); return; } - if (pud_leaf(*pudp_k)) + if (pud_leaf(pudp_get(pudp_k))) goto flush_tlb; /* @@ -161,11 +161,11 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a * to copy individual PTEs */ pmdp_k = pmd_offset(pudp_k, addr); - if (!pmd_present(*pmdp_k)) { + if (!pmd_present(pmdp_get(pmdp_k))) { no_context(regs, addr); return; } - if (pmd_leaf(*pmdp_k)) + if (pmd_leaf(pmdp_get(pmdp_k))) goto flush_tlb; /* @@ -175,7 +175,7 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a * silently loop forever. */ ptep_k = pte_offset_kernel(pmdp_k, addr); - if (!pte_present(*ptep_k)) { + if (!pte_present(ptep_get(ptep_k))) { no_context(regs, addr); return; } diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index 7781e83b2f29..a9d8e5bbac27 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/arch/riscv/mm/hugetlbpage.c @@ -54,7 +54,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, } if (sz == PMD_SIZE) { - if (want_pmd_share(vma, addr) && pud_none(*pudp)) + if (want_pmd_share(vma, addr) && pud_none(pudp_get(pudp))) ptep = huge_pmd_share(mm, vma, addr, pudp); else ptep = (pte_t *)pmd_alloc(mm, pudp, addr); @@ -93,11 +93,11 @@ pte_t *huge_pte_offset(struct mm_struct *mm, pmd_t *pmdp; pgdp = pgd_offset(mm, addr); - if (!pgd_present(*pgdp)) + if (!pgd_present(pgdp_get(pgdp))) return NULL; p4dp = p4d_offset(pgdp, addr); - if (!p4d_present(*p4dp)) + if (!p4d_present(p4dp_get(p4dp))) return NULL; pudp = pud_offset(p4dp, addr); @@ -105,7 +105,7 @@ pte_t *huge_pte_offset(struct mm_struct *mm, /* must be pud huge, non-present or none */ return (pte_t *)pudp; - if (!pud_present(*pudp)) + if (!pud_present(pudp_get(pudp))) return NULL; pmdp = pmd_offset(pudp, addr); @@ -113,7 +113,7 @@ pte_t *huge_pte_offset(struct mm_struct *mm, /* must be pmd huge, non-present or none */ return (pte_t *)pmdp; - if (!pmd_present(*pmdp)) + if (!pmd_present(pmdp_get(pmdp))) return NULL; for_each_napot_order(order) { @@ -285,7 +285,7 @@ void huge_pte_clear(struct mm_struct *mm, pte_t *ptep, unsigned long sz) { - pte_t pte = READ_ONCE(*ptep); + pte_t pte = ptep_get(ptep); int i, pte_num; if (!pte_napot(pte)) { diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c index ce0cb8e51d0a..aaadb7385e9f 100644 --- a/arch/riscv/mm/kasan_init.c +++ b/arch/riscv/mm/kasan_init.c @@ -31,7 +31,7 @@ static void __init kasan_populate_pte(pmd_t *pmdp, unsigned long vaddr, unsigned phys_addr_t phys_addr; pte_t *ptep, *p; - if (pmd_none(*pmdp)) { + if (pmd_none(pmdp_get(pmdp))) { p = memblock_alloc(PTRS_PER_PTE * sizeof(pte_t), PAGE_SIZE); set_pmd(pmdp, pfn_pmd(PFN_DOWN(__pa(p)), PAGE_TABLE)); } @@ -39,7 +39,7 @@ static void __init kasan_populate_pte(pmd_t *pmdp, unsigned long vaddr, unsigned ptep = pte_offset_kernel(pmdp, vaddr); do { - if (pte_none(*ptep)) { + if (pte_none(ptep_get(ptep))) { phys_addr = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); set_pte(ptep, pfn_pte(PFN_DOWN(phys_addr), PAGE_KERNEL)); memset(__va(phys_addr), KASAN_SHADOW_INIT, PAGE_SIZE); @@ -53,7 +53,7 @@ static void __init kasan_populate_pmd(pud_t *pudp, unsigned long vaddr, unsigned pmd_t *pmdp, *p; unsigned long next; - if (pud_none(*pudp)) { + if (pud_none(pudp_get(pudp))) { p = memblock_alloc(PTRS_PER_PMD * sizeof(pmd_t), PAGE_SIZE); set_pud(pudp, pfn_pud(PFN_DOWN(__pa(p)), PAGE_TABLE)); } @@ -63,7 +63,8 @@ static void __init kasan_populate_pmd(pud_t *pudp, unsigned long vaddr, unsigned do { next = pmd_addr_end(vaddr, end); - if (pmd_none(*pmdp) && IS_ALIGNED(vaddr, PMD_SIZE) && (next - vaddr) >= PMD_SIZE) { + if (pmd_none(pmdp_get(pmdp)) && IS_ALIGNED(vaddr, PMD_SIZE) && + (next - vaddr) >= PMD_SIZE) { phys_addr = memblock_phys_alloc(PMD_SIZE, PMD_SIZE); if (phys_addr) { set_pmd(pmdp, pfn_pmd(PFN_DOWN(phys_addr), PAGE_KERNEL)); @@ -83,7 +84,7 @@ static void __init kasan_populate_pud(p4d_t *p4dp, pud_t *pudp, *p; unsigned long next; - if (p4d_none(*p4dp)) { + if (p4d_none(p4dp_get(p4dp))) { p = memblock_alloc(PTRS_PER_PUD * sizeof(pud_t), PAGE_SIZE); set_p4d(p4dp, pfn_p4d(PFN_DOWN(__pa(p)), PAGE_TABLE)); } @@ -93,7 +94,8 @@ static void __init kasan_populate_pud(p4d_t *p4dp, do { next = pud_addr_end(vaddr, end); - if (pud_none(*pudp) && IS_ALIGNED(vaddr, PUD_SIZE) && (next - vaddr) >= PUD_SIZE) { + if (pud_none(pudp_get(pudp)) && IS_ALIGNED(vaddr, PUD_SIZE) && + (next - vaddr) >= PUD_SIZE) { phys_addr = memblock_phys_alloc(PUD_SIZE, PUD_SIZE); if (phys_addr) { set_pud(pudp, pfn_pud(PFN_DOWN(phys_addr), PAGE_KERNEL)); @@ -113,7 +115,7 @@ static void __init kasan_populate_p4d(pgd_t *pgdp, p4d_t *p4dp, *p; unsigned long next; - if (pgd_none(*pgdp)) { + if (pgd_none(pgdp_get(pgdp))) { p = memblock_alloc(PTRS_PER_P4D * sizeof(p4d_t), PAGE_SIZE); set_pgd(pgdp, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE)); } @@ -123,7 +125,8 @@ static void __init kasan_populate_p4d(pgd_t *pgdp, do { next = p4d_addr_end(vaddr, end); - if (p4d_none(*p4dp) && IS_ALIGNED(vaddr, P4D_SIZE) && (next - vaddr) >= P4D_SIZE) { + if (p4d_none(p4dp_get(p4dp)) && IS_ALIGNED(vaddr, P4D_SIZE) && + (next - vaddr) >= P4D_SIZE) { phys_addr = memblock_phys_alloc(P4D_SIZE, P4D_SIZE); if (phys_addr) { set_p4d(p4dp, pfn_p4d(PFN_DOWN(phys_addr), PAGE_KERNEL)); @@ -145,7 +148,7 @@ static void __init kasan_populate_pgd(pgd_t *pgdp, do { next = pgd_addr_end(vaddr, end); - if (pgd_none(*pgdp) && IS_ALIGNED(vaddr, PGDIR_SIZE) && + if (pgd_none(pgdp_get(pgdp)) && IS_ALIGNED(vaddr, PGDIR_SIZE) && (next - vaddr) >= PGDIR_SIZE) { phys_addr = memblock_phys_alloc(PGDIR_SIZE, PGDIR_SIZE); if (phys_addr) { @@ -168,7 +171,7 @@ static void __init kasan_early_clear_pud(p4d_t *p4dp, if (!pgtable_l4_enabled) { pudp = (pud_t *)p4dp; } else { - base_pudp = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(*p4dp))); + base_pudp = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(p4dp_get(p4dp)))); pudp = base_pudp + pud_index(vaddr); } @@ -193,7 +196,7 @@ static void __init kasan_early_clear_p4d(pgd_t *pgdp, if (!pgtable_l5_enabled) { p4dp = (p4d_t *)pgdp; } else { - base_p4dp = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgdp))); + base_p4dp = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(pgdp_get(pgdp)))); p4dp = base_p4dp + p4d_index(vaddr); } @@ -239,14 +242,14 @@ static void __init kasan_early_populate_pud(p4d_t *p4dp, if (!pgtable_l4_enabled) { pudp = (pud_t *)p4dp; } else { - base_pudp = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(*p4dp))); + base_pudp = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(p4dp_get(p4dp)))); pudp = base_pudp + pud_index(vaddr); } do { next = pud_addr_end(vaddr, end); - if (pud_none(*pudp) && IS_ALIGNED(vaddr, PUD_SIZE) && + if (pud_none(pudp_get(pudp)) && IS_ALIGNED(vaddr, PUD_SIZE) && (next - vaddr) >= PUD_SIZE) { phys_addr = __pa((uintptr_t)kasan_early_shadow_pmd); set_pud(pudp, pfn_pud(PFN_DOWN(phys_addr), PAGE_TABLE)); @@ -277,14 +280,14 @@ static void __init kasan_early_populate_p4d(pgd_t *pgdp, if (!pgtable_l5_enabled) { p4dp = (p4d_t *)pgdp; } else { - base_p4dp = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgdp))); + base_p4dp = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(pgdp_get(pgdp)))); p4dp = base_p4dp + p4d_index(vaddr); } do { next = p4d_addr_end(vaddr, end); - if (p4d_none(*p4dp) && IS_ALIGNED(vaddr, P4D_SIZE) && + if (p4d_none(p4dp_get(p4dp)) && IS_ALIGNED(vaddr, P4D_SIZE) && (next - vaddr) >= P4D_SIZE) { phys_addr = __pa((uintptr_t)kasan_early_shadow_pud); set_p4d(p4dp, pfn_p4d(PFN_DOWN(phys_addr), PAGE_TABLE)); @@ -305,7 +308,7 @@ static void __init kasan_early_populate_pgd(pgd_t *pgdp, do { next = pgd_addr_end(vaddr, end); - if (pgd_none(*pgdp) && IS_ALIGNED(vaddr, PGDIR_SIZE) && + if (pgd_none(pgdp_get(pgdp)) && IS_ALIGNED(vaddr, PGDIR_SIZE) && (next - vaddr) >= PGDIR_SIZE) { phys_addr = __pa((uintptr_t)kasan_early_shadow_p4d); set_pgd(pgdp, pfn_pgd(PFN_DOWN(phys_addr), PAGE_TABLE)); @@ -381,7 +384,7 @@ static void __init kasan_shallow_populate_pud(p4d_t *p4dp, do { next = pud_addr_end(vaddr, end); - if (pud_none(*pudp_k)) { + if (pud_none(pudp_get(pudp_k))) { p = memblock_alloc(PAGE_SIZE, PAGE_SIZE); set_pud(pudp_k, pfn_pud(PFN_DOWN(__pa(p)), PAGE_TABLE)); continue; @@ -401,7 +404,7 @@ static void __init kasan_shallow_populate_p4d(pgd_t *pgdp, do { next = p4d_addr_end(vaddr, end); - if (p4d_none(*p4dp_k)) { + if (p4d_none(p4dp_get(p4dp_k))) { p = memblock_alloc(PAGE_SIZE, PAGE_SIZE); set_p4d(p4dp_k, pfn_p4d(PFN_DOWN(__pa(p)), PAGE_TABLE)); continue; @@ -420,7 +423,7 @@ static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long do { next = pgd_addr_end(vaddr, end); - if (pgd_none(*pgdp_k)) { + if (pgd_none(pgdp_get(pgdp_k))) { p = memblock_alloc(PAGE_SIZE, PAGE_SIZE); set_pgd(pgdp_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE)); continue; @@ -451,7 +454,7 @@ static void __init create_tmp_mapping(void) /* Copy the last p4d since it is shared with the kernel mapping. */ if (pgtable_l5_enabled) { - ptr = (p4d_t *)pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_END)); + ptr = (p4d_t *)pgd_page_vaddr(pgdp_get(pgd_offset_k(KASAN_SHADOW_END))); memcpy(tmp_p4d, ptr, sizeof(p4d_t) * PTRS_PER_P4D); set_pgd(&tmp_pg_dir[pgd_index(KASAN_SHADOW_END)], pfn_pgd(PFN_DOWN(__pa(tmp_p4d)), PAGE_TABLE)); @@ -462,7 +465,7 @@ static void __init create_tmp_mapping(void) /* Copy the last pud since it is shared with the kernel mapping. */ if (pgtable_l4_enabled) { - ptr = (pud_t *)p4d_page_vaddr(*(base_p4d + p4d_index(KASAN_SHADOW_END))); + ptr = (pud_t *)p4d_page_vaddr(p4dp_get(base_p4dp + p4d_index(KASAN_SHADOW_END))); memcpy(tmp_pud, ptr, sizeof(pud_t) * PTRS_PER_PUD); set_p4d(&base_p4dp[p4d_index(KASAN_SHADOW_END)], pfn_p4d(PFN_DOWN(__pa(tmp_pud)), PAGE_TABLE)); diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c index ffca6f19dd9c..2198a8810811 100644 --- a/arch/riscv/mm/pageattr.c +++ b/arch/riscv/mm/pageattr.c @@ -28,7 +28,7 @@ static unsigned long set_pageattr_masks(unsigned long val, struct mm_walk *walk) static int pageattr_pgd_entry(pgd_t *pgdp, unsigned long addr, unsigned long next, struct mm_walk *walk) { - pgd_t val = READ_ONCE(*pgdp); + pgd_t val = pgdp_get(pgdp); if (pgd_leaf(val)) { val = __pgd(set_pageattr_masks(pgd_val(val), walk)); @@ -41,7 +41,7 @@ static int pageattr_pgd_entry(pgd_t *pgdp, unsigned long addr, static int pageattr_p4d_entry(p4d_t *p4dp, unsigned long addr, unsigned long next, struct mm_walk *walk) { - p4d_t val = READ_ONCE(*p4dp); + p4d_t val = p4dp_get(p4dp); if (p4d_leaf(val)) { val = __p4d(set_pageattr_masks(p4d_val(val), walk)); @@ -54,7 +54,7 @@ static int pageattr_p4d_entry(p4d_t *p4dp, unsigned long addr, static int pageattr_pud_entry(pud_t *pudp, unsigned long addr, unsigned long next, struct mm_walk *walk) { - pud_t val = READ_ONCE(*pudp); + pud_t val = pudp_get(pudp); if (pud_leaf(val)) { val = __pud(set_pageattr_masks(pud_val(val), walk)); @@ -67,7 +67,7 @@ static int pageattr_pud_entry(pud_t *pudp, unsigned long addr, static int pageattr_pmd_entry(pmd_t *pmdp, unsigned long addr, unsigned long next, struct mm_walk *walk) { - pmd_t val = READ_ONCE(*pmdp); + pmd_t val = pmdp_get(pmdp); if (pmd_leaf(val)) { val = __pmd(set_pageattr_masks(pmd_val(val), walk)); @@ -80,7 +80,7 @@ static int pageattr_pmd_entry(pmd_t *pmdp, unsigned long addr, static int pageattr_pte_entry(pte_t *ptep, unsigned long addr, unsigned long next, struct mm_walk *walk) { - pte_t val = READ_ONCE(*ptep); + pte_t val = ptep_get(ptep); val = __pte(set_pageattr_masks(pte_val(val), walk)); set_pte(ptep, val); @@ -216,33 +216,33 @@ bool kernel_page_present(struct page *page) pte_t *ptep; pgdp = pgd_offset_k(addr); - pgd = *pgdp; + pgd = pgdp_get(pgdp); if (!pgd_present(pgd)) return false; if (pgd_leaf(pgd)) return true; p4dp = p4d_offset(pgdp, addr); - p4d = *p4dp; + p4d = p4dp_get(p4dp); if (!p4d_present(p4d)) return false; if (p4d_leaf(p4d)) return true; pudp = pud_offset(p4dp, addr); - pud = *pudp; + pud = pudp_get(pudp); if (!pud_present(pud)) return false; if (pud_leaf(pud)) return true; pmdp = pmd_offset(pudp, addr); - pmd = *pmdp; + pmd = pmdp_get(pmdp); if (!pmd_present(pmd)) return false; if (pmd_leaf(pmd)) return true; ptep = pte_offset_kernel(pmdp, addr); - return pte_present(*ptep); + return pte_present(ptep_get(ptep)); } diff --git a/arch/riscv/mm/pgtable.c b/arch/riscv/mm/pgtable.c index 9c93f24d0829..777fcb116bb4 100644 --- a/arch/riscv/mm/pgtable.c +++ b/arch/riscv/mm/pgtable.c @@ -5,6 +5,29 @@ #include <linux/kernel.h> #include <linux/pgtable.h> +int ptep_set_access_flags(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep, + pte_t entry, int dirty) +{ + if (!pte_same(ptep_get(ptep), entry)) + __set_pte_at(ptep, entry); + /* + * update_mmu_cache will unconditionally execute, handling both + * the case that the PTE changed and the spurious fault case. + */ + return true; +} + +int ptep_test_and_clear_young(struct vm_area_struct *vma, + unsigned long address, + pte_t *ptep) +{ + if (!pte_young(ptep_get(ptep))) + return 0; + return test_and_clear_bit(_PAGE_ACCESSED_OFFSET, &pte_val(*ptep)); +} +EXPORT_SYMBOL_GPL(ptep_test_and_clear_young); + #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP int p4d_set_huge(p4d_t *p4dp, phys_addr_t addr, pgprot_t prot) { @@ -25,7 +48,7 @@ int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot) int pud_clear_huge(pud_t *pudp) { - if (!pud_leaf(READ_ONCE(*pudp))) + if (!pud_leaf(pudp_get(pudp))) return 0; pud_clear(pudp); return 1; @@ -33,7 +56,7 @@ int pud_clear_huge(pud_t *pudp) int pud_free_pmd_page(pud_t *pudp, unsigned long addr) { - pmd_t *pmdp = pud_pgtable(*pudp); + pmd_t *pmdp = pud_pgtable(pudp_get(pudp)); int i; pud_clear(pudp); @@ -63,7 +86,7 @@ int pmd_set_huge(pmd_t *pmdp, phys_addr_t phys, pgprot_t prot) int pmd_clear_huge(pmd_t *pmdp) { - if (!pmd_leaf(READ_ONCE(*pmdp))) + if (!pmd_leaf(pmdp_get(pmdp))) return 0; pmd_clear(pmdp); return 1; @@ -71,7 +94,7 @@ int pmd_clear_huge(pmd_t *pmdp) int pmd_free_pte_page(pmd_t *pmdp, unsigned long addr) { - pte_t *ptep = (pte_t *)pmd_page_vaddr(*pmdp); + pte_t *ptep = (pte_t *)pmd_page_vaddr(pmdp_get(pmdp)); pmd_clear(pmdp); @@ -88,7 +111,7 @@ pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); VM_BUG_ON(address & ~HPAGE_PMD_MASK); - VM_BUG_ON(pmd_trans_huge(*pmdp)); + VM_BUG_ON(pmd_trans_huge(pmdp_get(pmdp))); /* * When leaf PTE entries (regular pages) are collapsed into a leaf * PMD entry (huge page), a valid non-leaf PTE is converted into a

[5/5] riscv: Use accessors to page table entries instead of direct dereference

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Patch