From ff7ebff47c595e747aa1bb10d8a30b2acb7d425b Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 23 Jun 2021 14:02:09 +0200 Subject: [PATCH] x86/pkru: Provide pkru_write_default() 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 Signed-off-by: Borislav Petkov Reviewed-by: Borislav Petkov Link: https://lkml.kernel.org/r/20210623121455.513729794@linutronix.de --- arch/x86/include/asm/pkru.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/include/asm/pkru.h b/arch/x86/include/asm/pkru.h index 19d3d7b..7e45509 100644 --- 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 -- 2.7.4