Re: [Xen-devel] [PATCH v5 1/6] x86/hvm: Collect information of TSC scaling ratio

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.02.16 at 15:00, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 02/22/2016 09:04 PM, Haozhong Zhang wrote:
> 
>>   
>> +    if ( cpu_has_tsc_ratio )
>> +        svm_function_table.tsc_scaling.ratio_frac_bits = 32;
>> +
> 
> 
>>   
>> +#define hvm_tsc_scaling_supported \
>> +    (!!hvm_funcs.tsc_scaling.ratio_frac_bits)
>> +
> 
> What is the difference (in usage) between cpu_has_tsc_ratio and 
> hvm_tsc_scaling_supported? Isn't the first imply the second (and if yes 
> then what's the reason for having the latter)?

Iiuc cpu_has_tsc_ratio is AMD/SVM specific, while
hvm_tsc_scaling_supported is meant to be vendor independent.

Jan


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