[Bug 229215] hw.spec_store_bypass_disable_active=0 when hw.spec_store_bypass_disable=1 on AMD CPU

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229215

            Bug ID: 229215
           Summary: hw.spec_store_bypass_disable_active=0 when
                    hw.spec_store_bypass_disable=1 on AMD CPU
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pkubaj at anongoth.pl

I have two boxes with AMD Opteron 6262HE and 6386SE.

Both are reportedly vulnerable to Spectre v4, but it's reported that they don't
need new microcode, only kernel patches.

I'm running 11-STABLE and have hw.spec_store_bypass_disable=1.

Even then I can see that hw.spec_store_bypass_disable_active is 0.

On another PC, with new Intel microcode from platomav repo,
hw.spec_store_bypass_disable_active is 1, which suggests that something is
wrong with SSBD for AMD.

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