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linux-stable/arch/x86/kernel/fpu
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Yu-cheng Yu 99aa22d0d8 x86/fpu/xstate: Copy xstate registers directly to the signal frame when compacted format is in use 
XSAVES is a kernel instruction and uses a compacted format. When working
with user space, the kernel should provide standard-format, non-supervisor
state data. We cannot do __copy_to_user() from a compacted-format kernel
xstate area to a signal frame.

Dave Hansen proposes this method to simplify copy xstate directly to user.

This patch is based on an earlier patch from Fenghua Yu <fenghua.yu@intel.com>

Originally-from: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/c36f419d525517d04209a28dd8e1e5af9000036e.1463760376.git.yu-cheng.yu@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-06-18 10:10:19 +02:00
..
bugs.c x86/fpu: Remove check_fpu() indirection 2016-04-13 11:37:43 +02:00
core.c x86/fpu/xstate: Rename 'xstate_size' to 'fpu_kernel_xstate_size', to distinguish it from 'fpu_user_xstate_size' 2016-06-18 10:10:18 +02:00
init.c x86/fpu/xstate: Rename 'xstate_size' to 'fpu_kernel_xstate_size', to distinguish it from 'fpu_user_xstate_size' 2016-06-18 10:10:18 +02:00
Makefile x86/fpu: Factor out the FPU regset code into fpu/regset.c 2015-05-19 15:48:09 +02:00
regset.c x86/fpu/regset: Replace static_cpu_has() usage with boot_cpu_has() 2016-04-13 11:37:42 +02:00
signal.c x86/fpu/xstate: Copy xstate registers directly to the signal frame when compacted format is in use 2016-06-18 10:10:19 +02:00
xstate.c x86/fpu/xstate: Copy xstate registers directly to the signal frame when compacted format is in use 2016-06-18 10:10:19 +02:00