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Date: Sun, 17 Oct 2021 21:28:38 +0200 From: Thomas Gleixner <tglx@...utronix.de> To: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>, David Hildenbrand <david@...hat.com>, Andrea Arcangeli <aarcange@...hat.com>, Josh Poimboeuf <jpoimboe@...hat.com>, "H . Peter Anvin" <hpa@...or.com> Cc: Dave Hansen <dave.hansen@...el.com>, Tony Luck <tony.luck@...el.com>, Dan Williams <dan.j.williams@...el.com>, Andi Kleen <ak@...ux.intel.com>, Kirill Shutemov <kirill.shutemov@...ux.intel.com>, Sean Christopherson <seanjc@...gle.com>, Kuppuswamy Sathyanarayanan <knsathya@...nel.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH v7 02/10] x86/tdx: Add early_is_tdx_guest() interface On Tue, Oct 05 2021 at 13:41, Kuppuswamy Sathyanarayanan wrote: > + > +#define TDX_CPUID_LEAF_ID 0x21 > + > +static int tdx_guest = -1; > + > +static inline bool early_cpuid_has_tdx_guest(void) > +{ > + u32 eax = TDX_CPUID_LEAF_ID, sig[3] = {0}; > + > + if (cpuid_eax(0) < TDX_CPUID_LEAF_ID) > + return false; > + > + cpuid_count(TDX_CPUID_LEAF_ID, 0, &eax, &sig[0], &sig[2], &sig[1]); > + > + return !memcmp("IntelTDX ", sig, 12); > +} > + > +bool early_is_tdx_guest(void) > +{ > + if (tdx_guest < 0) > + tdx_guest = early_cpuid_has_tdx_guest(); > + > + return !!tdx_guest; > +} Sigh.
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