linux-kernel - Re: [PATCH v11 44/45] virt: sevguest: Add support to get extended report

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Message-ID: <0241967f-b2e6-7db4-7e54-be665e12ebb6@amd.com>
Date:   Fri, 4 Mar 2022 10:03:52 -0600
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        brijesh.ksingh@...il.com, tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH v11 44/45] virt: sevguest: Add support to get extended
 report


On 3/4/22 9:53 AM, Borislav Petkov wrote:
> On Fri, Mar 04, 2022 at 09:39:16AM -0600, Brijesh Singh wrote:
>> Depending on which ioctl user want to use for querying the attestation
>> report, she need to look at the SNP/GHCB specification for more details.
>> The blob contains header that application need to parse to get to the
>> actual certificate. The header is defined in the spec. From kernel
>> driver point-of-view, all these are opaque data.
> ... and the ioctl text needs to point to the spec so that the user knows
> where to find everything needed. Or how do you expect people to know how
> to use those ioctls?

I did added a text in Documentation/virt/coco/sevguest.rst (section 2.3)
that user need to look the GHCB spec for further detail.