linux-kernel - Re: [PATCH 2/3] DMA mapping: Move SME handling to x86-specific files

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Date:   Fri, 12 Jul 2019 18:09:57 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Thiago Jung Bauermann <bauerman@...ux.ibm.com>
cc:     x86@...nel.org, iommu@...ts.linux-foundation.org,
        linux-fsdevel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Mike Anderson <andmike@...ux.ibm.com>,
        Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH 2/3] DMA mapping: Move SME handling to x86-specific
 files

On Fri, 12 Jul 2019, Thiago Jung Bauermann wrote:
> diff --git a/include/linux/mem_encrypt.h b/include/linux/mem_encrypt.h
> index b310a9c18113..f2e399fb626b 100644
> --- a/include/linux/mem_encrypt.h
> +++ b/include/linux/mem_encrypt.h
> @@ -21,23 +21,11 @@
>  
>  #else	/* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
>  
> -#define sme_me_mask	0ULL
> -
> -static inline bool sme_active(void) { return false; }
>  static inline bool sev_active(void) { return false; }

You want to move out sev_active as well, the only relevant thing is
mem_encrypt_active(). Everything SME/SEV is an architecture detail.

> +static inline bool mem_encrypt_active(void) { return false; }

Thanks,

	tglx