Messages in this thread | | | Date | Tue, 2 Aug 2022 19:29:30 +0800 | Subject | Re: [RESEND] x86/bus_lock: Don't assume the init value of DEBUGCTLMSR.BUS_LOCK_DETECT to be zero | From | Chenyi Qiang <> |
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On 8/2/2022 6:51 PM, Ingo Molnar wrote: > > * 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?)
Yes, It's just a hypothetical for BIOS/firmware. Kexec is the real case I met with this problem.
> > Thanks, > > Ingo
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