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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 Content-Language: en-US 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> From: Brijesh Singh In-Reply-To: <1fdaca61-884a-ac13-fb33-a47db198f050@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SA0PR12CA0014.namprd12.prod.outlook.com (2603:10b6:806:6f::19) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 Received: from [10.0.0.6] (70.112.153.56) by SA0PR12CA0014.namprd12.prod.outlook.com (2603:10b6:806:6f::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4755.19 via Frontend Transport; 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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://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h 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. > 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.