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SubjectRe: [RFC v1 03/26] x86/cpufeatures: Add is_tdx_guest() interface
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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.
>

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

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