• Linus Torvalds's avatar
    Merge tag 'x86_mm_for_6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 22b8cc3e
    Linus Torvalds authored
    Pull x86 LAM (Linear Address Masking) support from Dave Hansen:
     "Add support for the new Linear Address Masking CPU feature.
    
      This is similar to ARM's Top Byte Ignore and allows userspace to store
      metadata in some bits of pointers without masking it out before use"
    
    * tag 'x86_mm_for_6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
      x86/mm/iommu/sva: Do not allow to set FORCE_TAGGED_SVA bit from outside
      x86/mm/iommu/sva: Fix error code for LAM enabling failure due to SVA
      selftests/x86/lam: Add test cases for LAM vs thread creation
      selftests/x86/lam: Add ARCH_FORCE_TAGGED_SVA test cases for linear-address masking
      selftests/x86/lam: Add inherit test cases for linear-address masking
      selftests/x86/lam: Add io_uring test cases for linear-address masking
      selftests/x86/lam: Add mmap and SYSCALL test cases for linear-address masking
      selftests/x86/lam: Add malloc and tag-bits test cases for linear-address masking
      x86/mm/iommu/sva: Make LAM and SVA mutually exclusive
      iommu/sva: Replace pasid_valid() helper with mm_valid_pasid()
      mm: Expose untagging mask in /proc/$PID/status
      x86/mm: Provide arch_prctl() interface for LAM
      x86/mm: Reduce untagged_addr() overhead for systems without LAM
      x86/uaccess: Provide untagged_addr() and remove tags before address check
      mm: Introduce untagged_addr_remote()
      x86/mm: Handle LAM on context switch
      x86: CPUID and CR3/CR4 flags for Linear Address Masking
      x86: Allow atomic MM_CONTEXT flags setting
      x86/mm: Rework address range check in get_user() and put_user()
    22b8cc3e
migrate.c 69.8 KB