x86/fpu: Add XFD state to fpstate

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Add storage for XFD register state to struct fpstate. This will be used to
store the XFD MSR state. This will be used for switching the XFD MSR when
FPU content is restored.

Add a per-CPU variable to cache the current MSR value so the MSR has only
to be written when the values are different.

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
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/20211021225527.10184-15-chang.seok.bae@intel.com

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Chang S. Bae 2021-10-21 15:55:18 -07:00 • committed by Borislav Petkov

parent dae1bd5838

commit 8bf26758ca

3 changed files with 9 additions and 0 deletions

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3

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

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2

arch/x86/kernel/fpu/core.c

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4

arch/x86/kernel/fpu/xstate.h

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