Re: [PATCH] x86/cpu: clear X86_BUG_SPECTRE_V2 on Zhaoxin family 7 CPUs

[Tony W Wang-oc]

On 16/01/2020 06:19, Thomas Gleixner wrote:
> Tony W Wang-oc <TonyWWang-oc@xxxxxxxxxxx> writes:
> 
>> These CPUs are not affected by spectre_v2, so clear spectre_v2 bug flag
>> in their specific initialization code.
>>  
>>  	if (cpu_has(c, X86_FEATURE_VMX))
>>  		centaur_detect_vmx_virtcap(c);
>> +
>> +	if (c->x86 == 7) {
>> +		setup_clear_cpu_cap(X86_BUG_SPECTRE_V2);
>> +		clear_bit(X86_BUG_SPECTRE_V2, (unsigned long *)cpu_caps_set);
> 
> No. Please use cpu_vuln_whitelist. It exists for exactly this
> purpose. You just need to extend it with a NO_SPECTRE_V2 bit.

Got, done.

Sincerely
TonyWWang-oc