[PATCH v6 00/13] x86/xsaves: Fix XSAVES issues

[Yu-cheng Yu]

XSAVES is a kernel-mode instruction. It offers a compacted format and
memory-write optimization. These patches fix issues in the first
implementation.

Changes since Version 5:

Patch 1, 2 - Change names to fpu_user_xstate_size and fpu_kernel_xstate_size;
             fix some comments, etc.

Patch 11 - In addition to a warning, make __raw_xsave_addr() return NULL
           when a disabled xstate component address is requested.

Patch 12 - Add more details in the comments of why this patch is needed;
           make a new macro for xcomp_bv[63].

Yu-cheng Yu (13):
  x86/xsaves: Define and use fpu_user_xstate_size
  x86/xsaves: Rename xstate_size to fpu_kernel_xstate_size to
    distinguish from fpu_user_xstate_size
  x86/xsaves: Keep init_fpstate.xsave.header.xfeatures as zero for init
    optimization
  x86/xsaves: Introduce a new check that allows correct xstates copy
    from kernel to user directly
  x86/xsaves: Align xstate components according to CPUID
  x86/xsaves: Supervisor state component offset
  x86/xsaves: Fix PTRACE frames for XSAVES
  x86/xsaves: Fix XSTATE component offset print out
  x86/xsaves: Fix xstate_offsets, xstate_sizes for non-extended states
  x86/xsaves: Fix __fpu_restore_sig() for XSAVES
  x86/xsaves: When a disabled xstate component offset is requested,
    return NULL
  x86/xsaves: Fix fpstate_init() for XRSTORS
  x86/xsaves: Re-enable XSAVES

 arch/x86/include/asm/fpu/types.h  |   7 +
 arch/x86/include/asm/fpu/xstate.h |  10 +-
 arch/x86/include/asm/processor.h  |   3 +-
 arch/x86/kernel/fpu/core.c        |  11 +-
 arch/x86/kernel/fpu/init.c        |  34 ++--
 arch/x86/kernel/fpu/regset.c      |  56 +++--
 arch/x86/kernel/fpu/signal.c      |  43 +++-
 arch/x86/kernel/fpu/xstate.c      | 417 ++++++++++++++++++++++++++++++--------
 8 files changed, 440 insertions(+), 141 deletions(-)

-- 
1.9.1