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

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Message-ID: <20170220183823.k7bsg77wbb4xyc2s@pd.tnic>
Date:   Mon, 20 Feb 2017 19:38:23 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Rik van Riel <riel@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Toshimitsu Kani <toshi.kani@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Larry Woodman <lwoodman@...hat.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [RFC PATCH v4 07/28] x86: Provide general kernel support for
 memory encryption

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@....com>

...

> +#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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