Re: [RFC PATCH v4 07/28] x86: Provide general kernel support for memory encryption

[Borislav Petkov]

On Thu, Feb 16, 2017 at 09:43:32AM -0600, Tom Lendacky wrote:
> Adding general kernel support for memory encryption includes:
> - Modify and create some page table macros to include the Secure Memory
>   Encryption (SME) memory encryption mask
> - Modify and create some macros for calculating physical and virtual
>   memory addresses
> - Provide an SME initialization routine to update the protection map with
>   the memory encryption mask so that it is used by default
> - #undef CONFIG_AMD_MEM_ENCRYPT in the compressed boot path
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>

...

> +#define __sme_pa(x)		(__pa((x)) | sme_me_mask)
> +#define __sme_pa_nodebug(x)	(__pa_nodebug((x)) | sme_me_mask)
> +
>  #else	/* !CONFIG_AMD_MEM_ENCRYPT */
>  
>  #ifndef sme_me_mask
> @@ -35,6 +42,13 @@ static inline bool sme_active(void)
>  }
>  #endif
>  
> +static inline void __init sme_early_init(void)
> +{
> +}
> +
> +#define __sme_pa		__pa
> +#define __sme_pa_nodebug	__pa_nodebug

One more thing - in the !CONFIG_AMD_MEM_ENCRYPT case, sme_me_mask is 0
so you don't need to define __sme_pa* again.

-- 
Regards/Gruss,
    Boris.

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