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[v8,00/28] arm64: Memory Tagging Extension user-space support

Message ID 20200824182758.27267-1-catalin.marinas@arm.com (mailing list archive)
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Series arm64: Memory Tagging Extension user-space support | expand

Message

Catalin Marinas Aug. 24, 2020, 6:27 p.m. UTC 
This is version 8 (version 7 here [1]) of the series adding user-space
support for the ARMv8.5 Memory Tagging Extension ([2], [3]). The patches
are also available on this branch:

  git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux for-next/mte

There have been no further ABI changes and aiming for a 5.10 merge.
While there is an ongoing discussion on allowing the prctl() to act on
all threads of a process, this can be implemented separately if actually
needed (I hope not).

I would be grateful for acks (or naks) on the following patches:

mm:

  [PATCH v7 06/29] mm: Add PG_arch_2 page flag
  [PATCH v7 07/29] mm: Preserve the PG_arch_2 flag in __split_huge_page_tail()
  [PATCH v7 13/29] mm: Introduce arch_calc_vm_flag_bits()

fs:
  
  [PATCH v7 24/29] fs: Handle intra-page faults in copy_mount_options()

arm64 KVM (small new addition in v7):

  [PATCH v7 02/29] arm64: mte: CPU feature detection and initial sysreg configuration

Changes in this version:

- Rebased onto v5.9-rc2.

- The MTE initialisation (SCTLR_EL1, GCR_EL1, MAIR_EL1) is now done in
  __cpu_setup before the MMU is enabled. This will be needed for the
  subsequent in-kernel MTE support and also simplifies the CnP
  interaction. The "downside" is that we won't allow CPUs with mixed MTE
  features (which isn't really a downside).

- print_pstate() now shows the TCO bit.

- Updates following the regset_user_copyout() and
  get_user_pages_remote() changes in mainline.

[1] https://lkml.kernel.org/r/20200715170844.30064-1-catalin.marinas@arm.com
[2] https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/enhancing-memory-safety
[3] https://developer.arm.com/-/media/Arm%20Developer%20Community/PDF/Arm_Memory_Tagging_Extension_Whitepaper.pdf
[4] https://sourceware.org/pipermail/libc-alpha/2020-June/115039.html

Catalin Marinas (16):
  arm64: mte: Use Normal Tagged attributes for the linear map
  mm: Preserve the PG_arch_2 flag in __split_huge_page_tail()
  arm64: mte: Clear the tags when a page is mapped in user-space with
    PROT_MTE
  arm64: Avoid unnecessary clear_user_page() indirection
  arm64: mte: Tags-aware aware memcmp_pages() implementation
  arm64: mte: Add PROT_MTE support to mmap() and mprotect()
  mm: Introduce arch_validate_flags()
  arm64: mte: Validate the PROT_MTE request via arch_validate_flags()
  mm: Allow arm64 mmap(PROT_MTE) on RAM-based files
  arm64: mte: Allow user control of the tag check mode via prctl()
  arm64: mte: Allow user control of the generated random tags via
    prctl()
  arm64: mte: Restore the GCR_EL1 register after a suspend
  arm64: mte: Allow {set,get}_tagged_addr_ctrl() on non-current tasks
  arm64: mte: ptrace: Add PTRACE_{PEEK,POKE}MTETAGS support
  arm64: mte: ptrace: Add NT_ARM_TAGGED_ADDR_CTRL regset
  fs: Handle intra-page faults in copy_mount_options()

Kevin Brodsky (1):
  mm: Introduce arch_calc_vm_flag_bits()

Steven Price (4):
  mm: Add PG_arch_2 page flag
  mm: Add arch hooks for saving/restoring tags
  arm64: mte: Enable swap of tagged pages
  arm64: mte: Save tags when hibernating

Vincenzo Frascino (7):
  arm64: mte: system register definitions
  arm64: mte: CPU feature detection and initial sysreg configuration
  arm64: mte: Add specific SIGSEGV codes
  arm64: mte: Handle synchronous and asynchronous tag check faults
  arm64: mte: Tags-aware copy_{user_,}highpage() implementations
  arm64: mte: Kconfig entry
  arm64: mte: Add Memory Tagging Extension documentation

 Documentation/arm64/cpu-feature-registers.rst |   2 +
 Documentation/arm64/elf_hwcaps.rst            |   4 +
 Documentation/arm64/index.rst                 |   1 +
 .../arm64/memory-tagging-extension.rst        | 305 ++++++++++++++++
 arch/arm64/Kconfig                            |  31 ++
 arch/arm64/include/asm/cpucaps.h              |   3 +-
 arch/arm64/include/asm/cpufeature.h           |   6 +
 arch/arm64/include/asm/hwcap.h                |   2 +-
 arch/arm64/include/asm/kvm_arm.h              |   3 +-
 arch/arm64/include/asm/memory.h               |  17 +-
 arch/arm64/include/asm/mman.h                 |  56 ++-
 arch/arm64/include/asm/mte.h                  |  86 +++++
 arch/arm64/include/asm/page.h                 |  19 +-
 arch/arm64/include/asm/pgtable-prot.h         |   2 +
 arch/arm64/include/asm/pgtable.h              |  46 ++-
 arch/arm64/include/asm/processor.h            |  12 +-
 arch/arm64/include/asm/sysreg.h               |  61 ++++
 arch/arm64/include/asm/thread_info.h          |   4 +-
 arch/arm64/include/uapi/asm/hwcap.h           |   2 +-
 arch/arm64/include/uapi/asm/mman.h            |   1 +
 arch/arm64/include/uapi/asm/ptrace.h          |   4 +
 arch/arm64/kernel/Makefile                    |   1 +
 arch/arm64/kernel/cpufeature.c                |  35 ++
 arch/arm64/kernel/cpuinfo.c                   |   2 +-
 arch/arm64/kernel/entry.S                     |  37 ++
 arch/arm64/kernel/hibernate.c                 | 118 ++++++
 arch/arm64/kernel/mte.c                       | 336 ++++++++++++++++++
 arch/arm64/kernel/process.c                   |  48 ++-
 arch/arm64/kernel/ptrace.c                    |  51 ++-
 arch/arm64/kernel/signal.c                    |   9 +
 arch/arm64/kernel/suspend.c                   |   4 +
 arch/arm64/kernel/syscall.c                   |  10 +
 arch/arm64/kvm/sys_regs.c                     |   2 +
 arch/arm64/lib/Makefile                       |   2 +
 arch/arm64/lib/mte.S                          | 151 ++++++++
 arch/arm64/mm/Makefile                        |   1 +
 arch/arm64/mm/copypage.c                      |  25 +-
 arch/arm64/mm/dump.c                          |   4 +
 arch/arm64/mm/fault.c                         |   9 +-
 arch/arm64/mm/mmu.c                           |  20 +-
 arch/arm64/mm/mteswap.c                       |  83 +++++
 arch/arm64/mm/proc.S                          |  32 +-
 arch/x86/kernel/signal_compat.c               |   2 +-
 fs/namespace.c                                |  25 +-
 fs/proc/page.c                                |   3 +
 fs/proc/task_mmu.c                            |   4 +
 include/linux/kernel-page-flags.h             |   1 +
 include/linux/mm.h                            |   8 +
 include/linux/mman.h                          |  23 +-
 include/linux/page-flags.h                    |   3 +
 include/linux/pgtable.h                       |  28 ++
 include/trace/events/mmflags.h                |   9 +-
 include/uapi/asm-generic/siginfo.h            |   4 +-
 include/uapi/linux/elf.h                      |   1 +
 include/uapi/linux/prctl.h                    |   9 +
 mm/huge_memory.c                              |   3 +
 mm/mmap.c                                     |   9 +
 mm/mprotect.c                                 |   6 +
 mm/page_io.c                                  |  10 +
 mm/shmem.c                                    |   9 +
 mm/swapfile.c                                 |   2 +
 mm/util.c                                     |   2 +-
 tools/vm/page-types.c                         |   2 +
 63 files changed, 1748 insertions(+), 62 deletions(-)
 create mode 100644 Documentation/arm64/memory-tagging-extension.rst
 create mode 100644 arch/arm64/include/asm/mte.h
 create mode 100644 arch/arm64/kernel/mte.c
 create mode 100644 arch/arm64/lib/mte.S
 create mode 100644 arch/arm64/mm/mteswap.c