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[92.145.124.62]) by smtp.gmail.com with ESMTPSA id cx8-20020a056000092800b0034e01a80176sm16002694wrb.114.2024.05.08.12.28.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 May 2024 12:28:45 -0700 (PDT) From: Alexandre Ghiti To: Ryan Roberts , Catalin Marinas , Will Deacon , Alexander Potapenko , Marco Elver , Dmitry Vyukov , Paul Walmsley , Palmer Dabbelt , Albert Ou , Ard Biesheuvel , Anup Patel , Atish Patra , Andrey Ryabinin , Andrey Konovalov , Vincenzo Frascino , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-riscv@lists.infradead.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-mm@kvack.org Cc: Alexandre Ghiti Subject: [PATCH 09/12] mm, riscv, arm64: Use common ptep_clear_flush_young() function Date: Wed, 8 May 2024 21:19:28 +0200 Message-Id: <20240508191931.46060-10-alexghiti@rivosinc.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240508191931.46060-1-alexghiti@rivosinc.com> References: <20240508191931.46060-1-alexghiti@rivosinc.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Make riscv use the contpte aware ptep_clear_flush_young() function from arm64. Note that riscv used to not flush the tlb after clearing the accessed bit, which it does now: this will be improved when we implement svinval support. Signed-off-by: Alexandre Ghiti --- arch/arm64/include/asm/pgtable.h | 22 ++++++++---------- arch/arm64/mm/contpte.c | 21 ----------------- arch/riscv/include/asm/pgtable.h | 12 +++++++--- include/linux/contpte.h | 2 ++ mm/contpte.c | 40 ++++++++++++++++++++++++++++++++ 5 files changed, 61 insertions(+), 36 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 9a8702d1ad00..92c12fb85cb4 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1389,8 +1389,6 @@ extern void contpte_clear_full_ptes(struct mm_struct *mm, unsigned long addr, extern pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr, int full); -extern int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep); extern void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr); extern int contpte_ptep_set_access_flags(struct vm_area_struct *vma, @@ -1479,16 +1477,8 @@ extern int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep); #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH -static inline int ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) -{ - pte_t orig_pte = __ptep_get(ptep); - - if (likely(!pte_valid_cont(orig_pte))) - return __ptep_clear_flush_young(vma, addr, ptep); - - return contpte_ptep_clear_flush_young(vma, addr, ptep); -} +extern int ptep_clear_flush_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep); #define wrprotect_ptes wrprotect_ptes static __always_inline void wrprotect_ptes(struct mm_struct *mm, @@ -1616,6 +1606,14 @@ static inline void arch_contpte_flush_tlb_range(struct vm_area_struct *vma, __flush_tlb_range(vma, start, end, stride, true, 3); } +static inline void arch_contpte_flush_tlb_range_nosync(struct vm_area_struct *vma, + unsigned long start, + unsigned long end, + unsigned long stride) +{ + __flush_tlb_range_nosync(vma, start, end, stride, true, 3); +} + static inline int arch_contpte_get_first_ncontig(size_t *pgsize) { if (pgsize) diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c index 9bf471633ca4..16940511943c 100644 --- a/arch/arm64/mm/contpte.c +++ b/arch/arm64/mm/contpte.c @@ -45,27 +45,6 @@ pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm, } EXPORT_SYMBOL_GPL(contpte_get_and_clear_full_ptes); -int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) -{ - int young; - - young = contpte_ptep_test_and_clear_young(vma, addr, ptep); - - if (young) { - /* - * See comment in __ptep_clear_flush_young(); same rationale for - * eliding the trailing DSB applies here. - */ - addr = ALIGN_DOWN(addr, CONT_PTE_SIZE); - __flush_tlb_range_nosync(vma, addr, addr + CONT_PTE_SIZE, - PAGE_SIZE, true, 3); - } - - return young; -} -EXPORT_SYMBOL_GPL(contpte_ptep_clear_flush_young); - void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr) { diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index d39cb24c6c4a..42c7884b8d2e 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -615,6 +615,8 @@ static inline void arch_contpte_flush_tlb_range(struct vm_area_struct *vma, flush_tlb_mm_range(vma->vm_mm, start, end, stride); } +#define arch_contpte_flush_tlb_range_nosync arch_contpte_flush_tlb_range + static inline int arch_contpte_get_first_ncontig(size_t *pgsize) { if (pgsize) @@ -758,9 +760,8 @@ static inline void __ptep_set_wrprotect(struct mm_struct *mm, atomic_long_and(~(unsigned long)_PAGE_WRITE, (atomic_long_t *)ptep); } -#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH -static inline int ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep) +static inline int __ptep_clear_flush_young(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep) { /* * This comment is borrowed from x86, but applies equally to RISC-V: @@ -799,6 +800,9 @@ extern pte_t ptep_get_and_clear(struct mm_struct *mm, #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG extern int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep); +#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH +extern int ptep_clear_flush_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep); #else /* CONFIG_THP_CONTPTE */ @@ -810,6 +814,8 @@ extern int ptep_test_and_clear_young(struct vm_area_struct *vma, #define ptep_get_and_clear __ptep_get_and_clear #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG #define ptep_test_and_clear_young __ptep_test_and_clear_young +#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH +#define ptep_clear_flush_young __ptep_clear_flush_young #endif /* CONFIG_THP_CONTPTE */ diff --git a/include/linux/contpte.h b/include/linux/contpte.h index 38092adbe0d4..76a49ac8b6f5 100644 --- a/include/linux/contpte.h +++ b/include/linux/contpte.h @@ -21,5 +21,7 @@ void contpte_set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte, unsigned int nr); int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep); +int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep); #endif /* _LINUX_CONTPTE_H */ diff --git a/mm/contpte.c b/mm/contpte.c index 220e9d81f401..600277b1196c 100644 --- a/mm/contpte.c +++ b/mm/contpte.c @@ -48,6 +48,7 @@ * - pte_clear() * - ptep_get_and_clear() * - ptep_test_and_clear_young() + * - ptep_clear_flush_young() */ pte_t huge_ptep_get(pte_t *ptep) @@ -729,4 +730,43 @@ __always_inline int ptep_test_and_clear_young(struct vm_area_struct *vma, return contpte_ptep_test_and_clear_young(vma, addr, ptep); } + +int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + int young; + + young = contpte_ptep_test_and_clear_young(vma, addr, ptep); + + if (young) { + /* + * See comment in __ptep_clear_flush_young(); same rationale for + * eliding the trailing DSB applies here. + */ + size_t pgsize; + int ncontig; + + ncontig = arch_contpte_get_num_contig(vma->vm_mm, addr, ptep, + 0, &pgsize); + + addr = ALIGN_DOWN(addr, ncontig * pgsize); + arch_contpte_flush_tlb_range_nosync(vma, addr, + addr + ncontig * pgsize, + pgsize); + } + + return young; +} +EXPORT_SYMBOL_GPL(contpte_ptep_clear_flush_young); + +__always_inline int ptep_clear_flush_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + pte_t orig_pte = __ptep_get(ptep); + + if (likely(!pte_valid_cont(orig_pte))) + return __ptep_clear_flush_young(vma, addr, ptep); + + return contpte_ptep_clear_flush_young(vma, addr, ptep); +} #endif /* CONFIG_THP_CONTPTE */