x86/fpu: Rename copy_xregs_to_kernel() and copy_kernel_to_xregs()

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The function names for xsave[s]/xrstor[s] operations are horribly named and
a permanent source of confusion.

Rename:
	copy_xregs_to_kernel() to os_xsave()
	copy_kernel_to_xregs() to os_xrstor()

These are truly low level wrappers around the actual instructions
XSAVE[OPT]/XRSTOR and XSAVES/XRSTORS with the twist that the selection
based on the available CPU features happens with an alternative to avoid
conditionals all over the place and to provide the best performance for hot
paths.

The os_ prefix tells that this is the OS selected mechanism.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121453.830239347@linutronix.de

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This commit is contained in:

Thomas Gleixner 2021-06-23 14:01:52 +02:00 • committed by Borislav Petkov

parent 1f3171252d

commit b16313f71c

4 changed files with 26 additions and 21 deletions

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17

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

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7

arch/x86/kernel/fpu/core.c

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21

arch/x86/kernel/fpu/signal.c

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2

arch/x86/kernel/fpu/xstate.c

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