[Bug 241988] hw.mds_disable sysctl has wrong sense

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241988

            Bug ID: 241988
           Summary: hw.mds_disable sysctl has wrong sense
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

sysctls should have positive sense.

hw.mds_disable is really something like hw.mds_mitigation_enable:

% sysctl -d hw.mds_disable
hw.mds_disable: Microarchitectural Data Sampling Mitigation (0 - off, 1 - on
VERW, 2 - on SW, 3 - on AUTO

it's even more confusing in light of the corresponding status sysctl:

% sysctl hw.mds_disable_state
hw.mds_disable_state: inactive

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