Messages in this thread | | | Subject | Re: [PATCH v6 04/11] x86/tdx: Add protected guest support for TDX guest | From | "Kuppuswamy, Sathyanarayanan" <> | Date | Tue, 28 Sep 2021 05:56:03 -0700 |
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On 9/28/21 4:46 AM, Joerg Roedel wrote: > On Fri, Sep 03, 2021 at 10:28:05AM -0700, Kuppuswamy Sathyanarayanan wrote: >> static inline bool prot_guest_has(unsigned int attr) >> { >> if (sme_me_mask) >> return amd_prot_guest_has(attr); >> + else if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) >> + return intel_prot_guest_has(attr); > > This causes a function call on every Intel machine this code runs. is > there an easier to check whether TDX is enabled, like the sme_me_mask > check on AMD?
This will only be called when CONFIG_ARCH_HAS_CC_PLATFORM is set by a platform. So it won't be called for all platforms.
Also, intel_prot_guest_has() is a generic Intel platform branch call (so we can't directly check for TDX here).
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-- Sathyanarayanan Kuppuswamy Linux Kernel Developer
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