x86/fpu: Add basic helpers for dynamically enabled features

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To allow building up the infrastructure required to support dynamically
enabled FPU features, add:

 - XFEATURES_MASK_DYNAMIC

   This constant will hold xfeatures which can be dynamically enabled.

 - fpu_state_size_dynamic()

   A static branch for 64-bit and a simple 'return false' for 32-bit.

   This helper allows to add dynamic-feature-specific changes to common
   code which is shared between 32-bit and 64-bit without #ifdeffery.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211021225527.10184-8-chang.seok.bae@intel.com

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Thomas Gleixner 2021-10-21 15:55:11 -07:00 • committed by Borislav Petkov

parent db8268df09

commit 23686ef25d

2 changed files with 25 additions and 0 deletions

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21

arch/x86/include/asm/fpu/xstate.h

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4

arch/x86/kernel/fpu/core.c

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