Re: [PATCH v4 0/8] Implement generic cc_platform_has() helper function

Kuppuswamy, Sathyanarayanan
2021-09-28T21:02:06Z

On 9/28/21 1:58 PM, Borislav Petkov wrote:
> On Tue, Sep 28, 2021 at 01:48:46PM -0700, Kuppuswamy, Sathyanarayanan wrote:
>> Just read it. If you want to use cpuid_has_tdx_guest() directly in
>> cc_platform_has(), then you want to rename intel_cc_platform_has() to
>> tdx_cc_platform_has()?
>
> Why?
>
> You simply do:
>
> if (cpuid_has_tdx_guest())
> intel_cc_platform_has(...);
>
> and lemme paste from that mail: " ...you should use
> cpuid_has_tdx_guest() instead but cache its result so that you don't
> call CPUID each time the kernel executes cc_platform_has()."
>
> Makes sense?

Yes. But, since the check is related to TDX, I just want to confirm whether
you are fine with naming the function as intel_*().

Since this patch is going to have dependency on TDX code, I will include
this patch in TDX patch set.

>

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer