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    Subject[tip: x86/fpu] x86/pkru: Provide pkru_write_default()
    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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