• Linus Torvalds's avatar
    Merge branch 'x86-iopl-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · ab851d49
    Linus Torvalds authored
    Pull x86 iopl updates from Ingo Molnar:
     "This implements a nice simplification of the iopl and ioperm code that
      Thomas Gleixner discovered: we can implement the IO privilege features
      of the iopl system call by using the IO permission bitmap in
      permissive mode, while trapping CLI/STI/POPF/PUSHF uses in user-space
      if they change the interrupt flag.
    
      This implements that feature, with testing facilities and related
      cleanups"
    
    [ "Simplification" may be an over-statement. The main goal is to avoid
      the cli/sti of iopl by effectively implementing the IO port access
      parts of iopl in terms of ioperm.
    
      This may end up not workign well in case people actually depend on
      cli/sti being available, or if there are mixed uses of iopl and
      ioperm. We will see..       - Linus ]
    
    * 'x86-iopl-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (22 commits)
      x86/ioperm: Fix use of deprecated config option
      x86/entry/32: Clarify register saving in __switch_to_asm()
      selftests/x86/iopl: Extend test to cover IOPL emulation
      x86/ioperm: Extend IOPL config to control ioperm() as well
      x86/iopl: Remove legacy IOPL option
      x86/iopl: Restrict iopl() permission scope
      x86/iopl: Fixup misleading comment
      selftests/x86/ioperm: Extend testing so the shared bitmap is exercised
      x86/ioperm: Share I/O bitmap if identical
      x86/ioperm: Remove bitmap if all permissions dropped
      x86/ioperm: Move TSS bitmap update to exit to user work
      x86/ioperm: Add bitmap sequence number
      x86/ioperm: Move iobitmap data into a struct
      x86/tss: Move I/O bitmap data into a seperate struct
      x86/io: Speedup schedule out of I/O bitmap user
      x86/ioperm: Avoid bitmap allocation if no permissions are set
      x86/ioperm: Simplify first ioperm() invocation logic
      x86/iopl: Cleanup include maze
      x86/tss: Fix and move VMX BUILD_BUG_ON()
      x86/cpu: Unify cpu_init()
      ...
    ab851d49
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