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@xxxxxxx [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
