linux-kernel - Re: [PATCHv2 03/29] x86/tdx: Add __tdx_module_call() and __tdx

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Date:   Fri, 4 Feb 2022 23:12:39 +1300
From:   Kai Huang <kai.huang@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, <mingo@...hat.com>,
        <bp@...en8.de>, <dave.hansen@...el.com>, <luto@...nel.org>,
        <peterz@...radead.org>,
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        <aarcange@...hat.com>, <ak@...ux.intel.com>,
        <dan.j.williams@...el.com>, <david@...hat.com>, <hpa@...or.com>,
        <jgross@...e.com>, <jmattson@...gle.com>, <joro@...tes.org>,
        <jpoimboe@...hat.com>, <knsathya@...nel.org>,
        <pbonzini@...hat.com>, <sdeep@...are.com>, <seanjc@...gle.com>,
        <tony.luck@...el.com>, <vkuznets@...hat.com>,
        <wanpengli@...cent.com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 03/29] x86/tdx: Add __tdx_module_call() and
 __tdx_hypercall() helper functions


> --- a/arch/x86/include/asm/tdx.h
> +++ b/arch/x86/include/asm/tdx.h
> @@ -8,6 +8,25 @@
>  #define TDX_CPUID_LEAF_ID	0x21
>  #define TDX_IDENT		"IntelTDX    "

Seems above two are not required by assembly file?  If so also move them to
within #ifndef __ASSEMBLY__?

>  
> +#define TDX_SEAMCALL_VMFAILINVALID     0x8000FF00FFFF0000ULL
> +
> +#ifndef __ASSEMBLY__
> +
> +/*
> + * Used to gather the output registers values of the TDCALL and SEAMCALL
> + * instructions when requesting services from the TDX module.
> + *
> + * This is a software only structure and not part of the TDX module/VMM ABI.
> + */
> +struct tdx_module_output {
> +	u64 rcx;
> +	u64 rdx;
> +	u64 r8;
> +	u64 r9;
> +	u64 r10;
> +	u64 r11;
> +};
> +

Is declaration of __tdx_module_call() outside of CONFIG_INTEL_TDX_GUEST?

>  #ifdef CONFIG_INTEL_TDX_GUEST
>  
>  void __init tdx_early_init(void);
> @@ -18,4 +37,5 @@ static inline void tdx_early_init(void) { };
>  
>  #endif /* CONFIG_INTEL_TDX_GUEST */
>  
> +#endif /* !__ASSEMBLY__ */
>  #endif /* _ASM_X86_TDX_H */