[Bug 229215] hw.spec_store_bypass_disable_active=0 when

[bugzilla...@freebsd.org]

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: bu...@FreeBSD.org
Reporter: pku...@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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