| Date | Wed, 23 Jun 2021 14:02:09 +0200 | From | Thomas Gleixner <> | Subject | [patch V4 42/65] 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> Reviewed-by: Borislav Petkov <bp@suse.de> --- arch/x86/include/asm/pkru.h | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/arch/x86/include/asm/pkru.h +++ b/arch/x86/include/asm/pkru.h @@ -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
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