Messages in this thread Patch in this message | | | Date | Wed, 23 Jun 2021 22:09:09 -0000 | From | "tip-bot2 for Thomas Gleixner" <> | Subject | [tip: x86/fpu] x86/pkru: Provide pkru_write_default() |
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The following commit has been merged into the x86/fpu branch of tip:
Commit-ID: ff7ebff47c595e747aa1bb10d8a30b2acb7d425b Gitweb: https://git.kernel.org/tip/ff7ebff47c595e747aa1bb10d8a30b2acb7d425b Author: Thomas Gleixner <tglx@linutronix.de> AuthorDate: Wed, 23 Jun 2021 14:02:09 +02:00 Committer: Borislav Petkov <bp@suse.de> CommitterDate: Wed, 23 Jun 2021 19:09:53 +02:00
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 <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 --- 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
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