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    Subject[PATCH 4.19 240/323] powerpc/security: Add a helper to query stf_barrier type
    Date
    From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>

    upstream commit 030905920f32e91a52794937f67434ac0b3ea41a

    Add a helper to return the stf_barrier type for the current processor.

    Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/3bd5d7f96ea1547991ac2ce3137dc2b220bae285.1633464148.git.naveen.n.rao@linux.vnet.ibm.com
    Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/powerpc/include/asm/security_features.h | 5 +++++
    arch/powerpc/kernel/security.c | 5 +++++
    2 files changed, 10 insertions(+)

    --- a/arch/powerpc/include/asm/security_features.h
    +++ b/arch/powerpc/include/asm/security_features.h
    @@ -39,6 +39,11 @@ static inline bool security_ftr_enabled(
    return !!(powerpc_security_features & feature);
    }

    +#ifdef CONFIG_PPC_BOOK3S_64
    +enum stf_barrier_type stf_barrier_type_get(void);
    +#else
    +static inline enum stf_barrier_type stf_barrier_type_get(void) { return STF_BARRIER_NONE; }
    +#endif

    // Features indicating support for Spectre/Meltdown mitigations

    --- a/arch/powerpc/kernel/security.c
    +++ b/arch/powerpc/kernel/security.c
    @@ -248,6 +248,11 @@ static int __init handle_no_stf_barrier(

    early_param("no_stf_barrier", handle_no_stf_barrier);

    +enum stf_barrier_type stf_barrier_type_get(void)
    +{
    + return stf_enabled_flush_types;
    +}
    +
    /* This is the generic flag used by other architectures */
    static int __init handle_ssbd(char *p)
    {

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