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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , "Kirill A . Shutemov" , Andi Kleen , "Dr . David Alan Gilbert" , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH v8 27/40] x86/boot: Add Confidential Computing type to setup_data To: Dave Hansen , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org References: <20211210154332.11526-1-brijesh.singh@amd.com> <20211210154332.11526-28-brijesh.singh@amd.com> <1fdaca61-884a-ac13-fb33-a47db198f050@intel.com> <2a5cfbd0-865c-2a8b-b70b-f8f64aba5575@intel.com> From: Brijesh Singh Message-ID: Date: Mon, 13 Dec 2021 08:49:41 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 In-Reply-To: <2a5cfbd0-865c-2a8b-b70b-f8f64aba5575@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MN2PR12CA0015.namprd12.prod.outlook.com (2603:10b6:208:a8::28) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 192afab3-ddd4-457f-4a41-08d9be47ce50 X-MS-TrafficTypeDiagnostic: SN6PR12MB4671:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; 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>>>> + u16 version; >>>> + u16 reserved; >>>> + u64 secrets_phys; >>>> + u32 secrets_len; >>>> + u64 cpuid_phys; >>>> + u32 cpuid_len; >>>> +}; >>> This is an ABI structure rather than some purely kernel construct, right? >> >> This is ABI between the guest BIOS and Guest OS. It is defined in the OVMF. >> >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ftianocore%2Fedk2%2Fblob%2Fmaster%2FOvmfPkg%2FInclude%2FGuid%2FConfidentialComputingSevSnpBlob.h&data=04%7C01%7Cbrijesh.singh%40amd.com%7C460f6abff7f04e065c9108d9bc1bfcf7%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637747650681544593%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=GI1fAngRJ%2Bj4hcM91UutVXlS1F7kfk2xxtG6I%2BL%2FRYc%3D&reserved=0 >> >> SEV-SNP FW spec does not have it documented; it's up to the guest BIOS >> on how it wants to communicate the Secrets and CPUID page location to >> guest OS. > > Well, no matter where it is defined, could we please make it a bit > easier for folks to find it in the future? > Noted, I will add a comment so that readers can find it easily. Additionally, I will create a doc and get it published on developer.amd.com/sev so that information is documented outside the source code files. >>> I searched through all of the specs to which you linked in the cover >>> letter. I looked for "blob", "guid", the magic and part of the GUID >>> itself trying to find where this is defined to see if the struct is correct. >>> >>> I couldn't find anything. >>> >>> Where is the spec for this blob? How large is it? Did you mean to >>> leave a 4-byte hole after secrets_len and before cpuid_phys? >> Yes, the length is never going to be > 4GB. > > I was more concerned that this structure could change sizes if it were > compiled on 32-bit versus 64-bit code. For kernel ABIs, we try not to > do that. > > Is this somehow OK when talking to firmware? Or can a 32-bit OS and > 64-bit firmware never interact? > For SNP, both the firmware and OS need to be 64-bit. IIRC, both the Linux and OVMF do not enable the memory encryption for the 32-bit. thanks