From: Steven Price <steven.price@arm.com> To: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org Cc: "Steven Price" <steven.price@arm.com>, "Andy Lutomirski" <luto@kernel.org>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Arnd Bergmann" <arnd@arndb.de>, "Borislav Petkov" <bp@alien8.de>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Ingo Molnar" <mingo@redhat.com>, "James Morse" <james.morse@arm.com>, "Jérôme Glisse" <jglisse@redhat.com>, "Peter Zijlstra" <peterz@infradead.org>, "Thomas Gleixner" <tglx@linutronix.de>, "Will Deacon" <will@kernel.org>, x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "Mark Rutland" <Mark.Rutland@arm.com>, "Liang, Kan" <kan.liang@linux.intel.com> Subject: [PATCH v16 04/25] arm64: mm: Add p?d_leaf() definitions Date: Fri, 6 Dec 2019 13:52:55 +0000 [thread overview] Message-ID: <20191206135316.47703-5-steven.price@arm.com> (raw) In-Reply-To: <20191206135316.47703-1-steven.price@arm.com> walk_page_range() is going to be allowed to walk page tables other than those of user space. For this it needs to know when it has reached a 'leaf' entry in the page tables. This information will be provided by the p?d_leaf() functions/macros. For arm64, we already have p?d_sect() macros which we can reuse for p?d_leaf(). pud_sect() is defined as a dummy function when CONFIG_PGTABLE_LEVELS < 3 or CONFIG_ARM64_64K_PAGES is defined. However when the kernel is configured this way then architecturally it isn't allowed to have a large page at this level, and any code using these page walking macros is implicitly relying on the page size/number of levels being the same as the kernel. So it is safe to reuse this for p?d_leaf() as it is an architectural restriction. CC: Catalin Marinas <catalin.marinas@arm.com> CC: Will Deacon <will@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Steven Price <steven.price@arm.com> --- arch/arm64/include/asm/pgtable.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 5d15b4735a0e..40df7e16d397 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -445,6 +445,7 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, PMD_TYPE_TABLE) #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ PMD_TYPE_SECT) +#define pmd_leaf(pmd) pmd_sect(pmd) #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3 static inline bool pud_sect(pud_t pud) { return false; } @@ -529,6 +530,7 @@ static inline void pte_unmap(pte_t *pte) { } #define pud_none(pud) (!pud_val(pud)) #define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT)) #define pud_present(pud) pte_present(pud_pte(pud)) +#define pud_leaf(pud) pud_sect(pud) #define pud_valid(pud) pte_valid(pud_pte(pud)) static inline void set_pud(pud_t *pudp, pud_t pud) -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Steven Price <steven.price@arm.com> To: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org Cc: "Mark Rutland" <Mark.Rutland@arm.com>, x86@kernel.org, "Arnd Bergmann" <arnd@arndb.de>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Peter Zijlstra" <peterz@infradead.org>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, linux-kernel@vger.kernel.org, "Steven Price" <steven.price@arm.com>, "Jérôme Glisse" <jglisse@redhat.com>, "Ingo Molnar" <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>, "Andy Lutomirski" <luto@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, "James Morse" <james.morse@arm.com>, "Thomas Gleixner" <tglx@linutronix.de>, "Will Deacon" <will@kernel.org>, linux-arm-kernel@lists.infradead.org, "Liang, Kan" <kan.liang@linux.intel.com> Subject: [PATCH v16 04/25] arm64: mm: Add p?d_leaf() definitions Date: Fri, 6 Dec 2019 13:52:55 +0000 [thread overview] Message-ID: <20191206135316.47703-5-steven.price@arm.com> (raw) In-Reply-To: <20191206135316.47703-1-steven.price@arm.com> walk_page_range() is going to be allowed to walk page tables other than those of user space. For this it needs to know when it has reached a 'leaf' entry in the page tables. This information will be provided by the p?d_leaf() functions/macros. For arm64, we already have p?d_sect() macros which we can reuse for p?d_leaf(). pud_sect() is defined as a dummy function when CONFIG_PGTABLE_LEVELS < 3 or CONFIG_ARM64_64K_PAGES is defined. However when the kernel is configured this way then architecturally it isn't allowed to have a large page at this level, and any code using these page walking macros is implicitly relying on the page size/number of levels being the same as the kernel. So it is safe to reuse this for p?d_leaf() as it is an architectural restriction. CC: Catalin Marinas <catalin.marinas@arm.com> CC: Will Deacon <will@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Steven Price <steven.price@arm.com> --- arch/arm64/include/asm/pgtable.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 5d15b4735a0e..40df7e16d397 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -445,6 +445,7 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, PMD_TYPE_TABLE) #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ PMD_TYPE_SECT) +#define pmd_leaf(pmd) pmd_sect(pmd) #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3 static inline bool pud_sect(pud_t pud) { return false; } @@ -529,6 +530,7 @@ static inline void pte_unmap(pte_t *pte) { } #define pud_none(pud) (!pud_val(pud)) #define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT)) #define pud_present(pud) pte_present(pud_pte(pud)) +#define pud_leaf(pud) pud_sect(pud) #define pud_valid(pud) pte_valid(pud_pte(pud)) static inline void set_pud(pud_t *pudp, pud_t pud) -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-12-06 13:53 UTC|newest] Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-12-06 13:52 [PATCH v16 00/25] Generic page walk and ptdump Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 01/25] mm: Add generic p?d_leaf() macros Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 02/25] arc: mm: Add p?d_leaf() definitions Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 03/25] arm: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price [this message] 2019-12-06 13:52 ` [PATCH v16 04/25] arm64: " Steven Price 2019-12-06 13:52 ` [PATCH v16 05/25] mips: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 06/25] powerpc: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-09 11:08 ` Michael Ellerman 2019-12-09 11:08 ` Michael Ellerman 2019-12-09 11:08 ` Michael Ellerman 2019-12-09 11:08 ` Michael Ellerman 2019-12-09 13:06 ` Steven Price 2019-12-09 13:06 ` Steven Price 2019-12-09 13:06 ` Steven Price 2019-12-09 13:06 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 07/25] riscv: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 08/25] s390: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 09/25] sparc: " Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 10/25] x86: " Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 11/25] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-12 11:23 ` Thomas Hellström (VMware) 2019-12-12 11:23 ` Thomas Hellström (VMware) 2019-12-12 11:33 ` Thomas Hellström (VMware) 2019-12-12 11:33 ` Thomas Hellström (VMware) 2019-12-12 13:15 ` Steven Price 2019-12-12 13:15 ` Steven Price 2019-12-12 14:04 ` Thomas Hellström (VMware) 2019-12-12 14:04 ` Thomas Hellström (VMware) 2019-12-12 15:18 ` Steven Price 2019-12-12 15:18 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 12/25] mm: pagewalk: Allow walking without vma Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 13/25] mm: pagewalk: Don't lock PTEs for walk_page_range_novma() Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-10 11:23 ` kbuild test robot 2019-12-10 11:23 ` kbuild test robot 2019-12-10 11:23 ` kbuild test robot 2019-12-11 15:54 ` Steven Price 2019-12-11 15:54 ` Steven Price 2019-12-11 15:54 ` Steven Price 2019-12-11 17:12 ` Luc Van Oostenryck 2019-12-11 17:12 ` Luc Van Oostenryck 2019-12-11 17:19 ` Qian Cai 2019-12-11 17:19 ` Qian Cai 2019-12-06 13:53 ` [PATCH v16 14/25] mm: pagewalk: fix termination condition in walk_pte_range() Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 15/25] mm: pagewalk: Add test_p?d callbacks Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 16/25] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 17/25] x86: mm: Point to struct seq_file from struct pg_state Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 18/25] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 19/25] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 20/25] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 21/25] mm: Add generic ptdump Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 22/25] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 23/25] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 24/25] arm64: mm: Display non-present entries in ptdump Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 25/25] mm: ptdump: Reduce level numbers by 1 in note_page() Steven Price 2019-12-06 13:53 ` Steven Price
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