# Re: \[PATCH v4 0/8\] Implement generic cc\_platform\_has() helper function

- From: Borislav Petkov \<bp@alien8.de\>
- Date: 2021-09-28 20:58:19 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/09/1525062
- Thread: https://ratatoskr.run/linuxppc-dev/2021/09/1524967/t.md

```text
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?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette
```