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Subject: Re: [PATCH v2 02/12] mm: Introduce a function to check for
 virtualization protection features
To:     Tom Lendacky <thomas.lendacky@amd.com>,
        linux-kernel@vger.kernel.org, x86@kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
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        linux-graphics-maintainer@vmware.com,
        amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org
Cc:     Borislav Petkov <bp@alien8.de>,
        Brijesh Singh <brijesh.singh@amd.com>,
        Joerg Roedel <joro@8bytes.org>,
        Andi Kleen <ak@linux.intel.com>,
        Tianyu Lan <Tianyu.Lan@microsoft.com>,
        Joerg Roedel <jroedel@suse.de>
References: <cover.1628873970.git.thomas.lendacky@amd.com>
 <482fe51f1671c1cd081039801b03db7ec0036332.1628873970.git.thomas.lendacky@amd.com>
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@linux.intel.com>
Message-ID: <d8448241-86f3-c582-87fd-5a0cab95a32f@linux.intel.com>
Date:   Fri, 13 Aug 2021 10:19:48 -0700
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On 8/13/21 9:59 AM, Tom Lendacky wrote:
> In prep for other protected virtualization technologies, introduce a
> generic helper function, prot_guest_has(), that can be used to check
> for specific protection 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())).
> 
> Reviewed-by: Joerg Roedel<jroedel@suse.de>
> Co-developed-by: Andi Kleen<ak@linux.intel.com>
> Signed-off-by: Andi Kleen<ak@linux.intel.com>
> Co-developed-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@linux.intel.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@linux.intel.com>
> Signed-off-by: Tom Lendacky<thomas.lendacky@amd.com>
> ---
>   arch/Kconfig                    |  3 +++
>   include/linux/protected_guest.h | 35 +++++++++++++++++++++++++++++++++
>   2 files changed, 38 insertions(+)
>   create mode 100644 include/linux/protected_guest.h

Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer