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

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Date:   Fri, 4 Feb 2022 16:18:26 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Kai Huang <kai.huang@...el.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

On Fri, Feb 04, 2022 at 11:12:39PM +1300, Kai Huang wrote:
> 
> > --- 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__?

Why? It is harmless.

> >  
> > +#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?

No, it is defined within CONFIG_INTEL_TDX_GUEST. Why? Host side has to
build their helper anyway.

> >  #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 */

-- 
 Kirill A. Shutemov