x86/pkru: Remove xstate fiddling from write_pkru()

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The PKRU value of a task is stored in task->thread.pkru when the task is
scheduled out. PKRU is restored on schedule in from there. So keeping the
XSAVE buffer up to date is a pointless exercise.

Remove the xstate fiddling and cleanup all related functions.

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/20210623121456.897372712@linutronix.de

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

parent 0e8c54f6b2

commit 72a6c08c44

3 changed files with 7 additions and 28 deletions

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17

arch/x86/include/asm/pkru.h

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14

arch/x86/include/asm/special_insns.h

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4

arch/x86/kvm/x86.c

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