Re: [RFC v1 03/26] x86/cpufeatures: Add is_tdx_guest() interface

[Dave Hansen]

On 4/1/21 2:15 PM, Kuppuswamy, Sathyanarayanan wrote:
> On 4/1/21 2:08 PM, Dave Hansen wrote:
>> On 2/5/21 3:38 PM, Kuppuswamy Sathyanarayanan wrote:
>>> +bool is_tdx_guest(void)
>>> +{
>>> +    return static_cpu_has(X86_FEATURE_TDX_GUEST);
>>> +}
>>
>> Why do you need is_tdx_guest() as opposed to calling
>> cpu_feature_enabled(X86_FEATURE_TDX_GUEST) everywhere?
> 
> is_tdx_guest() is also implemented/used in compressed
> code (which uses native_cpuid calls). I don't think
> we can use cpu_feature_enabled(X86_FEATURE_TDX_GUEST) in
> compressed code right? Also is_tdx_guest() looks easy
> to read and use.

OK, but how many of the is_tdx_guest() uses are in the compressed code?
 Why has its use spread beyond that?