Messages in this thread | | | Subject | Re: [PATCH v8 03/11] x86/cpufeatures: Add TDX Guest CPU feature | From | "Kuppuswamy, Sathyanarayanan" <> | Date | Tue, 5 Oct 2021 21:33:35 -0700 |
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On 10/5/21 8:42 PM, Josh Poimboeuf wrote: >> is_tdx_guest was mainly introduced to support cc_platform_has() >> API in early boot calls (similar to sme_me_mask in AMD code). >> Regarding FEATURE flag it will be useful for userspace tools to >> check the TDX feature support. > FEATURE flags can also be checked in the kernel, with boot_cpu_has(). > Or am I missing something?
Yes, previously we have been using x86_feature_enabled() check in cc_platform_has() call. Now with the introduction of is_tdx_guest global variable, we don't use it in kernel. But I still want to keep the feature flag for user space use case.
-- Sathyanarayanan Kuppuswamy Linux Kernel Developer
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