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  1. Mar 09, 2016
    • Tony Luck's avatar
      x86/mm, x86/mce: Add memcpy_mcsafe() · 92b0729c
      Tony Luck authored
      
      
      Make use of the EXTABLE_FAULT exception table entries to write
      a kernel copy routine that doesn't crash the system if it
      encounters a machine check. Prime use case for this is to copy
      from large arrays of non-volatile memory used as storage.
      
      We have to use an unrolled copy loop for now because current
      hardware implementations treat a machine check in "rep mov"
      as fatal. When that is fixed we can simplify.
      
      Return type is a "bool". True means that we copied OK, false means
      that it didn't.
      
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tony Luck <tony.luck@gmail.com>
      Link: http://lkml.kernel.org/r/a44e1055efc2d2a9473307b22c91caa437aa3f8b.1456439214.git.tony.luck@intel.com
      
      
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      92b0729c
  2. Mar 08, 2016
  3. Mar 07, 2016