From: Mark Rutland <mark.rutland@arm.com> To: Steven Price <steven.price@arm.com> Cc: linux-mm@kvack.org, "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, "Liang, Kan" <kan.liang@linux.intel.com>, "Andrew Morton" <akpm@linux-foundation.org> Subject: Re: [PATCH v9 19/21] mm: Add generic ptdump Date: Tue, 23 Jul 2019 10:57:48 +0100 [thread overview] Message-ID: <20190723095747.GB8085@lakrids.cambridge.arm.com> (raw) In-Reply-To: <20190722154210.42799-20-steven.price@arm.com> On Mon, Jul 22, 2019 at 04:42:08PM +0100, Steven Price wrote: > Add a generic version of page table dumping that architectures can > opt-in to > > Signed-off-by: Steven Price <steven.price@arm.com> [...] > +#ifdef CONFIG_KASAN > +/* > + * This is an optimization for KASAN=y case. Since all kasan page tables > + * eventually point to the kasan_early_shadow_page we could call note_page() > + * right away without walking through lower level page tables. This saves > + * us dozens of seconds (minutes for 5-level config) while checking for > + * W+X mapping or reading kernel_page_tables debugfs file. > + */ > +static inline bool kasan_page_table(struct ptdump_state *st, void *pt, > + unsigned long addr) > +{ > + if (__pa(pt) == __pa(kasan_early_shadow_pmd) || > +#ifdef CONFIG_X86 > + (pgtable_l5_enabled() && > + __pa(pt) == __pa(kasan_early_shadow_p4d)) || > +#endif > + __pa(pt) == __pa(kasan_early_shadow_pud)) { > + st->note_page(st, addr, 5, pte_val(kasan_early_shadow_pte[0])); > + return true; > + } > + return false; Having you tried this with CONFIG_DEBUG_VIRTUAL? The kasan_early_shadow_pmd is a kernel object rather than a linear map object, so you should use __pa_symbol for that. It's a bit horrid to have to test multiple levels in one function; can't we check the relevant level inline in each of the test_p?d funcs? They're optional anyway, so they only need to be defined for CONFIG_KASAN. Thanks, Mark. > +} > +#else > +static inline bool kasan_page_table(struct ptdump_state *st, void *pt, > + unsigned long addr) > +{ > + return false; > +} > +#endif > + > +static int ptdump_test_p4d(unsigned long addr, unsigned long next, > + p4d_t *p4d, struct mm_walk *walk) > +{ > + struct ptdump_state *st = walk->private; > + > + if (kasan_page_table(st, p4d, addr)) > + return 1; > + return 0; > +} > +static int ptdump_test_pud(unsigned long addr, unsigned long next, > + pud_t *pud, struct mm_walk *walk) > +{ > + struct ptdump_state *st = walk->private; > + > + if (kasan_page_table(st, pud, addr)) > + return 1; > + return 0; > +} > + > +static int ptdump_test_pmd(unsigned long addr, unsigned long next, > + pmd_t *pmd, struct mm_walk *walk) > +{ > + struct ptdump_state *st = walk->private; > + > + if (kasan_page_table(st, pmd, addr)) > + return 1; > + return 0; > +} > + > +static int ptdump_hole(unsigned long addr, unsigned long next, > + struct mm_walk *walk) > +{ > + struct ptdump_state *st = walk->private; > + > + st->note_page(st, addr, -1, 0); > + > + return 0; > +} > + > +void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm) > +{ > + struct mm_walk walk = { > + .mm = mm, > + .pgd_entry = ptdump_pgd_entry, > + .p4d_entry = ptdump_p4d_entry, > + .pud_entry = ptdump_pud_entry, > + .pmd_entry = ptdump_pmd_entry, > + .pte_entry = ptdump_pte_entry, > + .test_p4d = ptdump_test_p4d, > + .test_pud = ptdump_test_pud, > + .test_pmd = ptdump_test_pmd, > + .pte_hole = ptdump_hole, > + .private = st > + }; > + const struct ptdump_range *range = st->range; > + > + down_read(&mm->mmap_sem); > + while (range->start != range->end) { > + walk_page_range(range->start, range->end, &walk); > + range++; > + } > + up_read(&mm->mmap_sem); > + > + /* Flush out the last page */ > + st->note_page(st, 0, 0, 0); > +} > -- > 2.20.1 >
WARNING: multiple messages have this Message-ID (diff)
From: Mark Rutland <mark.rutland@arm.com> To: Steven Price <steven.price@arm.com> Cc: 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, linux-mm@kvack.org, "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>, "Andrew Morton" <akpm@linux-foundation.org>, linux-arm-kernel@lists.infradead.org, "Liang, Kan" <kan.liang@linux.intel.com> Subject: Re: [PATCH v9 19/21] mm: Add generic ptdump Date: Tue, 23 Jul 2019 10:57:48 +0100 [thread overview] Message-ID: <20190723095747.GB8085@lakrids.cambridge.arm.com> (raw) In-Reply-To: <20190722154210.42799-20-steven.price@arm.com> On Mon, Jul 22, 2019 at 04:42:08PM +0100, Steven Price wrote: > Add a generic version of page table dumping that architectures can > opt-in to > > Signed-off-by: Steven Price <steven.price@arm.com> [...] > +#ifdef CONFIG_KASAN > +/* > + * This is an optimization for KASAN=y case. Since all kasan page tables > + * eventually point to the kasan_early_shadow_page we could call note_page() > + * right away without walking through lower level page tables. This saves > + * us dozens of seconds (minutes for 5-level config) while checking for > + * W+X mapping or reading kernel_page_tables debugfs file. > + */ > +static inline bool kasan_page_table(struct ptdump_state *st, void *pt, > + unsigned long addr) > +{ > + if (__pa(pt) == __pa(kasan_early_shadow_pmd) || > +#ifdef CONFIG_X86 > + (pgtable_l5_enabled() && > + __pa(pt) == __pa(kasan_early_shadow_p4d)) || > +#endif > + __pa(pt) == __pa(kasan_early_shadow_pud)) { > + st->note_page(st, addr, 5, pte_val(kasan_early_shadow_pte[0])); > + return true; > + } > + return false; Having you tried this with CONFIG_DEBUG_VIRTUAL? The kasan_early_shadow_pmd is a kernel object rather than a linear map object, so you should use __pa_symbol for that. It's a bit horrid to have to test multiple levels in one function; can't we check the relevant level inline in each of the test_p?d funcs? They're optional anyway, so they only need to be defined for CONFIG_KASAN. Thanks, Mark. > +} > +#else > +static inline bool kasan_page_table(struct ptdump_state *st, void *pt, > + unsigned long addr) > +{ > + return false; > +} > +#endif > + > +static int ptdump_test_p4d(unsigned long addr, unsigned long next, > + p4d_t *p4d, struct mm_walk *walk) > +{ > + struct ptdump_state *st = walk->private; > + > + if (kasan_page_table(st, p4d, addr)) > + return 1; > + return 0; > +} > +static int ptdump_test_pud(unsigned long addr, unsigned long next, > + pud_t *pud, struct mm_walk *walk) > +{ > + struct ptdump_state *st = walk->private; > + > + if (kasan_page_table(st, pud, addr)) > + return 1; > + return 0; > +} > + > +static int ptdump_test_pmd(unsigned long addr, unsigned long next, > + pmd_t *pmd, struct mm_walk *walk) > +{ > + struct ptdump_state *st = walk->private; > + > + if (kasan_page_table(st, pmd, addr)) > + return 1; > + return 0; > +} > + > +static int ptdump_hole(unsigned long addr, unsigned long next, > + struct mm_walk *walk) > +{ > + struct ptdump_state *st = walk->private; > + > + st->note_page(st, addr, -1, 0); > + > + return 0; > +} > + > +void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm) > +{ > + struct mm_walk walk = { > + .mm = mm, > + .pgd_entry = ptdump_pgd_entry, > + .p4d_entry = ptdump_p4d_entry, > + .pud_entry = ptdump_pud_entry, > + .pmd_entry = ptdump_pmd_entry, > + .pte_entry = ptdump_pte_entry, > + .test_p4d = ptdump_test_p4d, > + .test_pud = ptdump_test_pud, > + .test_pmd = ptdump_test_pmd, > + .pte_hole = ptdump_hole, > + .private = st > + }; > + const struct ptdump_range *range = st->range; > + > + down_read(&mm->mmap_sem); > + while (range->start != range->end) { > + walk_page_range(range->start, range->end, &walk); > + range++; > + } > + up_read(&mm->mmap_sem); > + > + /* Flush out the last page */ > + st->note_page(st, 0, 0, 0); > +} > -- > 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:[~2019-07-23 9:57 UTC|newest] Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-07-22 15:41 [PATCH v9 00/21] Generic page walk and ptdump Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 01/21] arc: mm: Add p?d_leaf() definitions Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 02/21] arm: " Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 03/21] arm64: " Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 04/21] mips: " Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 21:47 ` Paul Burton 2019-07-22 21:47 ` Paul Burton 2019-07-24 13:03 ` Steven Price 2019-07-24 13:03 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 05/21] powerpc: " Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 06/21] riscv: " Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 07/21] s390: " Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 08/21] sparc: " Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 09/21] x86: " Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-22 15:41 ` [PATCH v9 10/21] mm: Add generic p?d_leaf() macros Steven Price 2019-07-22 15:41 ` Steven Price 2019-07-23 9:41 ` Mark Rutland 2019-07-23 9:41 ` Mark Rutland 2019-07-24 13:48 ` Steven Price 2019-07-24 13:48 ` Steven Price 2019-07-28 11:44 ` Anshuman Khandual 2019-07-28 11:44 ` Anshuman Khandual 2019-07-29 11:38 ` Steven Price 2019-07-29 11:38 ` Steven Price 2019-08-01 6:09 ` Anshuman Khandual 2019-08-01 6:09 ` Anshuman Khandual 2019-08-01 12:22 ` Steven Price 2019-08-01 12:22 ` Steven Price 2019-07-29 12:50 ` Mark Rutland 2019-07-29 12:50 ` Mark Rutland 2019-08-01 6:13 ` Anshuman Khandual 2019-08-01 6:13 ` Anshuman Khandual 2019-07-22 15:42 ` [PATCH v9 11/21] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-23 10:14 ` Mark Rutland 2019-07-23 10:14 ` Mark Rutland 2019-07-24 13:53 ` Steven Price 2019-07-24 13:53 ` Steven Price 2019-07-24 14:09 ` Mark Rutland 2019-07-24 14:09 ` Mark Rutland 2019-07-28 12:33 ` Anshuman Khandual 2019-07-28 12:33 ` Anshuman Khandual 2019-07-29 12:17 ` Steven Price 2019-07-29 12:17 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 12/21] mm: pagewalk: Allow walking without vma Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-28 14:20 ` Anshuman Khandual 2019-07-28 14:20 ` Anshuman Khandual 2019-07-29 12:29 ` Steven Price 2019-07-29 12:29 ` Steven Price 2019-08-01 6:41 ` Anshuman Khandual 2019-08-01 6:41 ` Anshuman Khandual 2019-07-22 15:42 ` [PATCH v9 13/21] mm: pagewalk: Add test_p?d callbacks Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-28 13:41 ` Anshuman Khandual 2019-07-28 13:41 ` Anshuman Khandual 2019-07-29 12:34 ` Steven Price 2019-07-29 12:34 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 14/21] x86: mm: Don't display pages which aren't present in debugfs Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 15/21] x86: mm: Point to struct seq_file from struct pg_state Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 16/21] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 17/21] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 18/21] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 19/21] mm: Add generic ptdump Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-23 9:57 ` Mark Rutland [this message] 2019-07-23 9:57 ` Mark Rutland 2019-07-24 16:36 ` Steven Price 2019-07-24 16:36 ` Steven Price 2019-07-29 2:59 ` Anshuman Khandual 2019-07-29 2:59 ` Anshuman Khandual 2019-07-29 13:56 ` Steven Price 2019-07-29 13:56 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 20/21] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-22 15:42 ` [PATCH v9 21/21] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price 2019-07-22 15:42 ` Steven Price 2019-07-23 6:39 ` [PATCH v9 00/21] Generic page walk and ptdump Anshuman Khandual 2019-07-23 6:39 ` Anshuman Khandual 2019-07-24 13:35 ` Steven Price 2019-07-24 13:35 ` Steven Price 2019-07-25 9:09 ` Anshuman Khandual 2019-07-25 9:09 ` Anshuman Khandual 2019-07-25 9:30 ` Will Deacon 2019-07-25 9:30 ` Will Deacon 2019-07-26 6:03 ` Anshuman Khandual 2019-07-26 6:03 ` Anshuman Khandual 2019-07-25 10:15 ` Steven Price 2019-07-25 10:15 ` Steven Price 2019-07-23 10:16 ` Mark Rutland 2019-07-23 10:16 ` Mark Rutland 2019-07-24 13:35 ` Steven Price 2019-07-24 13:35 ` Steven Price 2019-07-24 13:57 ` Thomas Gleixner 2019-07-24 13:57 ` Thomas Gleixner 2019-07-24 14:07 ` Mark Rutland 2019-07-24 14:07 ` Mark Rutland 2019-07-24 14:18 ` Steven Price 2019-07-24 14:18 ` Steven Price 2019-07-24 14:37 ` Thomas Gleixner 2019-07-24 14:37 ` Thomas Gleixner 2019-07-28 11:20 ` Anshuman Khandual 2019-07-28 11:20 ` Anshuman Khandual 2019-07-29 11:32 ` Steven Price 2019-07-29 11:32 ` Steven Price 2019-07-31 9:27 ` Sven Schnelle 2019-07-31 9:27 ` Sven Schnelle 2019-07-31 11:18 ` Steven Price 2019-07-31 11:18 ` Steven Price
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