• Linus Torvalds's avatar
    Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · 5694cecd
    Linus Torvalds authored
    Pull arm64 festive updates from Will Deacon:
     "In the end, we ended up with quite a lot more than I expected:
       - Support for ARMv8.3 Pointer Authentication in userspace (CRIU and
         kernel-side support to come later)
       - Support for per-thread stack canaries, pending an update to GCC
         that is currently undergoing review
       - Support for kexec_file_load(), which permits secure boot of a kexec
         payload but also happens to improve the performance of kexec
         dramatically because we can avoid the sucky purgatory code from
         userspace. Kdump will come later (requires updates to libfdt).
       - Optimisation of our dynamic CPU feature framework, so that all
         detected features are enabled via a single stop_machine()
       - KPTI whitelisting of Cortex-A CPUs unaffected by Meltdown, so that
         they can benefit from global TLB entries when KASLR is not in use
       - 52-bit virtual addressing for userspace (kernel remains 48-bit)
       - Patch in LSE atomics for per-cpu atomic operations
       - Custom preempt.h implementation to avoid unconditional calls to
         preempt_schedule() from preempt_enable()
       - Support for the new 'SB' Speculation Barrier instruction
       - Vectorised implementation of XOR checksumming and CRC32
       - Workaround for Cortex-A76 erratum #1165522
       - Improved compatibility with Clang/LLD
       - Support for TX2 system PMUS for profiling the L3 cache and DMC
       - Reflect read-only permissions in the linear map by default
       - Ensure MMIO reads are ordered with subsequent calls to Xdelay()
       - Initial support for memory hotplug
       - Tweak the threshold when we invalidate the TLB by-ASID, so that
         mremap() performance is improved for ranges spanning multiple PMDs.
       - Minor refactoring and cleanups"
    * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (125 commits)
      arm64: kaslr: print PHYS_OFFSET in dump_kernel_offset()
      arm64: sysreg: Use _BITUL() when defining register bits
      arm64: cpufeature: Rework ptr auth hwcaps using multi_entry_cap_matches
      arm64: cpufeature: Reduce number of pointer auth CPU caps from 6 to 4
      arm64: docs: document pointer authentication
      arm64: ptr auth: Move per-thread keys from thread_info to thread_struct
      arm64: enable pointer authentication
      arm64: add prctl control for resetting ptrauth keys
      arm64: perf: strip PAC when unwinding userspace
      arm64: expose user PAC bit positions via ptrace
      arm64: add basic pointer authentication support
      arm64/cpufeature: detect pointer authentication
      arm64: Don't trap host pointer auth use to EL2
      arm64/kvm: hide ptrauth from guests
      arm64/kvm: consistently handle host HCR_EL2 flags
      arm64: add pointer authentication register bits
      arm64: add comments about EC exception levels
      arm64: perf: Treat EXCLUDE_EL* bit definitions as unsigned
      arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field
      arm64: enable per-task stack canaries
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