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From: Steven Price <steven.price@arm.com>
To: 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.deacon@arm.com>,
	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 v3 00/34] Convert x86 & arm64 to use generic page walk
Date: Wed, 27 Feb 2019 17:05:34 +0000	[thread overview]
Message-ID: <20190227170608.27963-1-steven.price@arm.com> (raw)

Most architectures current have a debugfs file for dumping the kernel
page tables. Currently each architecture has to implement custom
functions for walking the page tables because the generic
walk_page_range() function is unable to walk the page tables used by the
kernel.

This series extends the capabilities of walk_page_range() so that it can
deal with the page tables of the kernel (which have no VMAs and can
contain larger huge pages than exist for user space). x86 and arm64 are
then converted to make use of walk_page_range() removing the custom page
table walkers.

To enable a generic page table walker to walk the unusual mappings of
the kernel we need to implement a set of functions which let us know
when the walker has reached the leaf entry. Since arm, powerpc, s390,
sparc and x86 all have p?d_large macros lets standardise on that and
implement those that are missing.

Potentially future changes could unify the implementations of the
debugfs walkers further, moving the common functionality into common
code. This would require a common way of handling the effective
permissions (currently implemented only for x86) along with a per-arch
way of formatting the page table information for debugfs. One
immediate benefit would be getting the KASAN speed up optimisation in
arm64 (and other arches) which is currently only implemented for x86.

Changes since v2:
 * Rather than attemping to provide generic macros, actually implement
   p?d_large() for each architecture.

Changes since v1:
 * Added p4d_large() macro
 * Comments to explain p?d_large() macro semantics
 * Expanded comment for pte_hole() callback to explain mapping between
   depth and P?D
 * Handle folded page tables at all levels, so depth from pte_hole()
   ignores folding at any level (see real_depth() function in
   mm/pagewalk.c)

Steven Price (34):
  alpha: mm: Add p?d_large() definitions
  arc: mm: Add p?d_large() definitions
  arm: mm: Add p?d_large() definitions
  arm64: mm: Add p?d_large() definitions
  c6x: mm: Add p?d_large() definitions
  csky: mm: Add p?d_large() definitions
  hexagon: mm: Add p?d_large() definitions
  ia64: mm: Add p?d_large() definitions
  m68k: mm: Add p?d_large() definitions
  microblaze: mm: Add p?d_large() definitions
  mips: mm: Add p?d_large() definitions
  nds32: mm: Add p?d_large() definitions
  nios2: mm: Add p?d_large() definitions
  openrisc: mm: Add p?d_large() definitions
  parisc: mm: Add p?d_large() definitions
  powerpc: mm: Add p?d_large() definitions
  riscv: mm: Add p?d_large() definitions
  s390: mm: Add p?d_large() definitions
  sh: mm: Add p?d_large() definitions
  sparc: mm: Add p?d_large() definitions
  um: mm: Add p?d_large() definitions
  unicore32: mm: Add p?d_large() definitions
  xtensa: mm: Add p?d_large() definitions
  mm: Add generic p?d_large() macros
  mm: pagewalk: Add p4d_entry() and pgd_entry()
  mm: pagewalk: Allow walking without vma
  mm: pagewalk: Add 'depth' parameter to pte_hole
  mm: pagewalk: Add test_p?d callbacks
  arm64: mm: Convert mm/dump.c to use walk_page_range()
  x86/mm: Point to struct seq_file from struct pg_state
  x86/mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct
  x86/mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct
  x86/mm: Convert ptdump_walk_pgd_level_core() to take an mm_struct
  x86: mm: Convert dump_pagetables to use walk_page_range

 arch/alpha/include/asm/pgtable.h              |   2 +
 arch/arc/include/asm/pgtable.h                |   1 +
 arch/arm/include/asm/pgtable-2level.h         |   1 +
 arch/arm/include/asm/pgtable-3level.h         |   1 +
 arch/arm64/include/asm/pgtable.h              |   2 +
 arch/arm64/mm/dump.c                          | 108 +++---
 arch/c6x/include/asm/pgtable.h                |   2 +
 arch/csky/include/asm/pgtable.h               |   2 +
 arch/hexagon/include/asm/pgtable.h            |   5 +
 arch/ia64/include/asm/pgtable.h               |   3 +
 arch/m68k/include/asm/mcf_pgtable.h           |   2 +
 arch/m68k/include/asm/motorola_pgtable.h      |   2 +
 arch/m68k/include/asm/pgtable_no.h            |   1 +
 arch/m68k/include/asm/sun3_pgtable.h          |   2 +
 arch/microblaze/include/asm/pgtable.h         |   2 +
 arch/mips/include/asm/pgtable-32.h            |   5 +
 arch/mips/include/asm/pgtable-64.h            |  15 +
 arch/mips/include/asm/pgtable-bits.h          |   2 +-
 arch/nds32/include/asm/pgtable.h              |   2 +
 arch/nios2/include/asm/pgtable.h              |   5 +
 arch/openrisc/include/asm/pgtable.h           |   1 +
 arch/parisc/include/asm/pgtable.h             |   3 +
 arch/powerpc/include/asm/book3s/32/pgtable.h  |   1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h  |  27 +-
 arch/powerpc/include/asm/nohash/32/pgtable.h  |   1 +
 .../include/asm/nohash/64/pgtable-4k.h        |   1 +
 arch/powerpc/kvm/book3s_64_mmu_radix.c        |  12 +-
 arch/riscv/include/asm/pgtable-64.h           |   6 +
 arch/riscv/include/asm/pgtable.h              |   6 +
 arch/s390/include/asm/pgtable.h               |  10 +
 arch/sh/include/asm/pgtable-3level.h          |   1 +
 arch/sh/include/asm/pgtable_32.h              |   1 +
 arch/sh/include/asm/pgtable_64.h              |   1 +
 arch/sparc/include/asm/pgtable_32.h           |  10 +
 arch/sparc/include/asm/pgtable_64.h           |   1 +
 arch/um/include/asm/pgtable-3level.h          |   1 +
 arch/um/include/asm/pgtable.h                 |   1 +
 arch/unicore32/include/asm/pgtable.h          |   1 +
 arch/x86/include/asm/pgtable.h                |  26 +-
 arch/x86/mm/debug_pagetables.c                |   8 +-
 arch/x86/mm/dump_pagetables.c                 | 342 +++++++++---------
 arch/x86/platform/efi/efi_32.c                |   2 +-
 arch/x86/platform/efi/efi_64.c                |   4 +-
 arch/xtensa/include/asm/pgtable.h             |   1 +
 fs/proc/task_mmu.c                            |   4 +-
 include/asm-generic/4level-fixup.h            |   1 +
 include/asm-generic/5level-fixup.h            |   1 +
 include/asm-generic/pgtable-nop4d-hack.h      |   1 +
 include/asm-generic/pgtable-nop4d.h           |   1 +
 include/asm-generic/pgtable-nopmd.h           |   1 +
 include/asm-generic/pgtable-nopud.h           |   1 +
 include/linux/mm.h                            |  26 +-
 mm/hmm.c                                      |   2 +-
 mm/migrate.c                                  |   1 +
 mm/mincore.c                                  |   1 +
 mm/pagewalk.c                                 | 107 ++++--
 56 files changed, 489 insertions(+), 291 deletions(-)

-- 
2.20.1


             reply	other threads:[~2019-02-27 17:06 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-27 17:05 Steven Price [this message]
2019-02-27 17:05 ` [PATCH v3 01/34] alpha: mm: Add p?d_large() definitions Steven Price
2019-02-27 17:05 ` [PATCH v3 02/34] arc: " Steven Price
2019-02-27 18:18   ` Vineet Gupta
2019-02-27 17:05 ` [PATCH v3 03/34] arm: " Steven Price
2019-03-01 21:47   ` Kirill A. Shutemov
2019-03-04 11:56     ` Steven Price
2019-03-04 13:10       ` Kirill A. Shutemov
2019-02-27 17:05 ` [PATCH v3 04/34] arm64: " Steven Price
2019-02-27 17:05 ` [PATCH v3 05/34] c6x: " Steven Price
2019-03-01 21:48   ` Kirill A. Shutemov
2019-03-04 12:01     ` Steven Price
2019-03-04 13:11       ` Kirill A. Shutemov
2019-02-27 17:05 ` [PATCH v3 06/34] csky: " Steven Price
2019-03-01 21:51   ` Kirill A. Shutemov
2019-02-27 17:05 ` [PATCH v3 07/34] hexagon: " Steven Price
2019-02-27 17:05 ` [PATCH v3 08/34] ia64: " Steven Price
2019-03-01 21:57   ` Kirill A. Shutemov
2019-03-04 13:16     ` Steven Price
2019-03-04 19:06       ` Luck, Tony
2019-03-06 13:45         ` Steven Price
2019-02-27 17:05 ` [PATCH v3 09/34] m68k: " Steven Price
2019-02-27 19:27   ` Geert Uytterhoeven
2019-02-28 11:36     ` Mike Rapoport
2019-02-28 11:53       ` Geert Uytterhoeven
2019-02-28 12:04         ` Steven Price
2019-03-01 11:45           ` Mike Rapoport
2019-02-27 17:05 ` [PATCH v3 10/34] microblaze: " Steven Price
2019-02-27 17:05 ` [PATCH v3 11/34] mips: " Steven Price
2019-02-28  2:15   ` Paul Burton
2019-02-28 12:11     ` Steven Price
2019-02-28 18:55       ` Paul Burton
2019-03-01 11:02         ` Steven Price
2019-02-27 17:05 ` [PATCH v3 12/34] nds32: " Steven Price
2019-02-27 17:05 ` [PATCH v3 13/34] nios2: " Steven Price
2019-02-27 17:05 ` [PATCH v3 14/34] openrisc: " Steven Price
2019-02-27 17:05 ` [PATCH v3 15/34] parisc: " Steven Price
2019-02-27 18:54   ` Helge Deller
2019-03-01 22:12     ` Kirill A. Shutemov
2019-03-05 21:45       ` Helge Deller
2019-02-27 17:05 ` [PATCH v3 16/34] powerpc: " Steven Price
2019-02-27 17:05 ` [PATCH v3 17/34] riscv: " Steven Price
2019-02-27 17:05 ` [PATCH v3 18/34] s390: " Steven Price
2019-02-27 17:40   ` Martin Schwidefsky
2019-02-28 11:43     ` Steven Price
2019-02-27 17:05 ` [PATCH v3 19/34] sh: " Steven Price
2019-02-27 17:05 ` [PATCH v3 20/34] sparc: " Steven Price
2019-02-27 18:38   ` David Miller
2019-02-28 11:49     ` Steven Price
2019-02-27 17:05 ` [PATCH v3 21/34] um: " Steven Price
2019-02-27 17:05 ` [PATCH v3 22/34] unicore32: " Steven Price
2019-02-27 17:05 ` [PATCH v3 23/34] xtensa: " Steven Price
2019-02-27 17:29   ` Max Filippov
2019-02-27 17:05 ` [PATCH v3 24/34] mm: Add generic p?d_large() macros Steven Price
2019-02-27 17:05 ` [PATCH v3 25/34] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-02-27 17:06 ` [PATCH v3 26/34] mm: pagewalk: Allow walking without vma Steven Price
2019-02-27 17:06 ` [PATCH v3 27/34] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price
2019-02-27 17:38   ` Dave Hansen
2019-02-28 11:28     ` Steven Price
2019-02-28 19:00       ` Dave Hansen
2019-03-01 11:24         ` Steven Price
2019-02-27 17:06 ` [PATCH v3 28/34] mm: pagewalk: Add test_p?d callbacks Steven Price
2019-02-27 17:06 ` [PATCH v3 29/34] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2019-02-27 17:06 ` [PATCH v3 30/34] x86/mm: Point to struct seq_file from struct pg_state Steven Price
2019-02-27 17:06 ` [PATCH v3 31/34] x86/mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-02-27 17:06 ` [PATCH v3 32/34] x86/mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price
2019-02-27 17:06 ` [PATCH v3 33/34] x86/mm: Convert ptdump_walk_pgd_level_core() " Steven Price
2019-02-27 17:06 ` [PATCH v3 34/34] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price

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