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    SubjectRe: [PATCH 6/7] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC_CTRL feature
    On Thu, Jan 04, 2018 at 09:56:47AM -0800, Tim Chen wrote:
    > There are 2 ways to control IBRS
    >
    > 1. At boot time
    > noibrs kernel boot parameter will disable IBRS usage
    >
    > Otherwise if the above parameters are not specified, the system
    > will enable ibrs and ibpb usage if the cpu supports it.
    >
    > 2. At run time
    > echo 0 > /sys/kernel/debug/ibrs_enabled will turn off IBRS
    > echo 1 > /sys/kernel/debug/ibrs_enabled will turn on IBRS in kernel
    > echo 2 > /sys/kernel/debug/ibrs_enabled will turn on IBRS in both userspace and kernel

    debug/x86/?

    Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>

    Thanks,
    Andrea

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