Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features

[Vladimir Davydov <vdavydov@parallels.com>]

On 07/20/2012 09:10 PM, Andi Kleen wrote:
>> +					unsigned int *msr_ext_cpuid_mask)
>> +{
>> +	unsigned int msr, msr_ext;
>> +
>> +	msr = msr_ext = 0;
>> +
>> +	switch (c->x86_model) {
> You have to check the family too.
>
>> +
>> +	return msr;
>> +}
>> +
>> +static void __cpuinit intel_mask_cpu_caps(struct cpuinfo_x86 *c)
>> +{
>> +	u32 low, high;
>> +	unsigned int msr_cpuid_mask, msr_ext_cpuid_mask;
>> +
>> +	msr_cpuid_mask = intel_cpuid_mask_msr(c,&msr_ext_cpuid_mask);
>> +	if (msr_cpuid_mask) {
>> +		set_cpu_cap(c, X86_FEATURE_CPUIDMASK);
>> +
>> +		rdmsr(msr_cpuid_mask, low, high);
> And please use rdmsrl(), rdmsr() is so 90ies
>
> Other than that patch looks good. I presume it will be useful for
> other things than just migration too.
>
> -Andi
>

Thank you for review, but we've decided to drop this since the kernel 
does not seem to be a suitable place for such "tweaking".