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x86/pkru: Provide pkru_write_default()

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Provide a simple and trivial helper which just writes the PKRU default
value without trying to fiddle with the task's xsave buffer.

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/20210623121455.513729794@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-06-23 14:02:09 +02:00 committed by Borislav Petkov
parent 739e2eec0f
commit ff7ebff47c
1 changed files with 8 additions and 0 deletions
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8
arch/x86/include/asm/pkru.h
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@ -60,4 +60,12 @@ static inline void write_pkru(u32 pkru)
fpregs_unlock();
}
static inline void pkru_write_default(void)
{
if (!cpu_feature_enabled(X86_FEATURE_OSPKE))
return;
wrpkru(pkru_get_init_value());
}
#endif