x86/fpu: Move FXSAVE_LEAK quirk info __copy_kernel_to_fpregs()

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copy_kernel_to_fpregs() restores all xfeatures but it is also the place
where the AMD FXSAVE_LEAK bug is handled.

That prevents fpregs_restore_userregs() to limit the restored features,
which is required to untangle PKRU and XSTATE handling and also for the
upcoming supervisor state management.

Move the FXSAVE_LEAK quirk into __copy_kernel_to_fpregs() and deinline that
function which has become rather fat.

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/20210623121456.114271278@linutronix.de

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Thomas Gleixner 2021-06-23 14:02:15 +02:00 • committed by Borislav Petkov

parent 727d01100e

commit 1d9bffab11

2 changed files with 28 additions and 24 deletions

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25

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

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27

arch/x86/kernel/fpu/core.c

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