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    Subject[PATCH 4.14 051/157] arm64: kpti: Use early_param for kpti= command-line option
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Will Deacon <will.deacon@arm.com>

    commit b5b7dd647f2d21b93f734ce890671cd908e69b0a upstream.

    We inspect __kpti_forced early on as part of the cpufeature enable
    callback which remaps the swapper page table using non-global entries.

    Ensure that __kpti_forced has been updated to reflect the kpti=
    command-line option before we start using it.

    Fixes: ea1e3de85e94 ("arm64: entry: Add fake CPU feature for unmapping the kernel at EL0")
    Cc: <stable@vger.kernel.org> # 4.16.x-
    Reported-by: Wei Xu <xuwei5@hisilicon.com>
    Tested-by: Sudeep Holla <sudeep.holla@arm.com>
    Tested-by: Wei Xu <xuwei5@hisilicon.com>
    Signed-off-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/kernel/cpufeature.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/arm64/kernel/cpufeature.c
    +++ b/arch/arm64/kernel/cpufeature.c
    @@ -877,7 +877,7 @@ static int __init parse_kpti(char *str)
    __kpti_forced = enabled ? 1 : -1;
    return 0;
    }
    -__setup("kpti=", parse_kpti);
    +early_param("kpti", parse_kpti);
    #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */

    static const struct arm64_cpu_capabilities arm64_features[] = {

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