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Date:   Fri, 10 Sep 2021 17:02:10 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Tom Lendacky <thomas.lendacky@amd.com>
Cc:     linux-kernel@vger.kernel.org, x86@kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
        iommu@lists.linux-foundation.org, kvm@vger.kernel.org,
        linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org,
        linux-graphics-maintainer@vmware.com,
        amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org,
        Brijesh Singh <brijesh.singh@amd.com>,
        Joerg Roedel <joro@8bytes.org>,
        Andi Kleen <ak@linux.intel.com>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@linux.intel.com>,
        Tianyu Lan <Tianyu.Lan@microsoft.com>,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v3 2/8] mm: Introduce a function to check for
 confidential computing features
Message-ID: <YTtzcoFdi7Ond8Kt@zn.tnic>
References: <cover.1631141919.git.thomas.lendacky@amd.com>
 <0a7618d54e7e954ee56c22ad1b94af2ffe69543a.1631141919.git.thomas.lendacky@amd.com>
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On Wed, Sep 08, 2021 at 05:58:33PM -0500, Tom Lendacky wrote:
> In prep for other confidential computing technologies, introduce a generic

preparation

> helper function, cc_platform_has(), that can be used to check for specific
> active confidential computing attributes, like memory encryption. This is
> intended to eliminate having to add multiple technology-specific checks to
> the code (e.g. if (sev_active() || tdx_active())).

...

> diff --git a/include/linux/cc_platform.h b/include/linux/cc_platform.h
> new file mode 100644
> index 000000000000..253f3ea66cd8
> --- /dev/null
> +++ b/include/linux/cc_platform.h
> @@ -0,0 +1,88 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Confidential Computing Platform Capability checks
> + *
> + * Copyright (C) 2021 Advanced Micro Devices, Inc.
> + *
> + * Author: Tom Lendacky <thomas.lendacky@amd.com>
> + */
> +
> +#ifndef _CC_PLATFORM_H

	_LINUX_CC_PLATFORM_H

> +#define _CC_PLATFORM_H

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette