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SubjectRe: [RESEND] x86/bus_lock: Don't assume the init value of DEBUGCTLMSR.BUS_LOCK_DETECT to be zero

* Chenyi Qiang <chenyi.qiang@intel.com> wrote:

> It's possible that BIOS/firmware has set DEBUGCTLMSR_BUS_LOCK_DETECT, or
> this kernel has been kexec'd from a kernel that enabled bus lock
> detection.
>
> Disable bus lock detection explicitly if not wanted.

Makes sense.

Just curious: in what circumstances does the BIOS/firmware set
DEBUGCTLMSR_BUS_LOCK_DETECT? Does it use it, or does it enable it for some
spurious reason, without really using the feature? (Assuming you are aware
of instances where this happened - or was this simply a hypothetical?)

Thanks,

Ingo

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