linux-kernel - Re: [PATCH v2 02/12] mm: Introduce a function to check for virtualization protection features

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Date:   Fri, 13 Aug 2021 10:19:48 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Tom Lendacky <thomas.lendacky@....com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-graphics-maintainer@...are.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        kexec@...ts.infradead.org, linux-fsdevel@...r.kernel.org
Cc:     Borislav Petkov <bp@...en8.de>,
        Brijesh Singh <brijesh.singh@....com>,
        Joerg Roedel <joro@...tes.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v2 02/12] mm: Introduce a function to check for
 virtualization protection features



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@...e.de>
> Co-developed-by: Andi Kleen<ak@...ux.intel.com>
> Signed-off-by: Andi Kleen<ak@...ux.intel.com>
> Co-developed-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@...ux.intel.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@...ux.intel.com>
> Signed-off-by: Tom Lendacky<thomas.lendacky@....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@...ux.intel.com>

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer