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Wed, 11 Feb 2026 21:06:18 +0000 From: Date: Wed, 11 Feb 2026 13:06:17 -0800 To: Kuppuswamy Sathyanarayanan , Kiryl Shutsemau CC: Dan Williams , Dave Hansen , Rick Edgecombe , , , Message-ID: <698cef4964e8_8c32100a3@dwillia2-mobl4.notmuch> In-Reply-To: <6983882c-2c00-42f4-924b-5fb3619840be@linux.intel.com> References: <20260211001712.1531955-1-sathyanarayanan.kuppuswamy@linux.intel.com> <20260211001712.1531955-4-sathyanarayanan.kuppuswamy@linux.intel.com> <6983882c-2c00-42f4-924b-5fb3619840be@linux.intel.com> Subject: Re: [PATCH v1 3/3] virt: tdx-guest: Increase Quote buffer size to 128KB Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR05CA0048.namprd05.prod.outlook.com (2603:10b6:a03:74::25) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|PH7PR11MB5793:EE_ X-MS-Office365-Filtering-Correlation-Id: 21b01162-2f26-43b5-4238-08de69b16665 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7053199007|7142099003; 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DICE enables layered > >> and extensible attestation, where evidence is accumulated across > >> multiple boot stages. > >> > >> With SGX-based attestation, Quote sizes are typically under 8KB, as the > >> payload consists primarily of Quote data and a small certificate bundle. > >> Existing TDX guest code sizes the Quote buffer accordingly. > >> > >> DICE-based attestation produces significantly larger Quotes due to the > >> inclusion of evidence (certificate chains) from multiple boot layers. > >> The cumulative Quote size can reach approximately 100KB. > >> > >> Increase GET_QUOTE_BUF_SIZE to 128KB to ensure sufficient buffer > >> capacity for DICE-based Quote payloads. > > > > It worth noting that it requires guest physically-contiguous memory. > > > > Single order-5 allocation is not that bad as long as the driver > > initialized during the boot. > > Good point! We can add following to the commit log: > > The Quote buffer requires guest physically-contiguous memory and is > allocated once during driver initialization at boot time, where an > order-5 allocation (128KB) is expected to succeed reliably. That is good feedback. I would rather not restart the timer on the linux-next exposure with a rebase to add that. I think in this case it is sufficient that the commit has a link back to this discussion: Link: https://patch.msgid.link/20260211001712.1531955-4-sathyanarayanan.kuppuswamy@linux.intel.com However, when the the patch to add the link to the documentation for the CBOR Web Token schema is ready, do take the opportunity to also add a patch commenting about the order-5 allocation risk to GET_QUOTE_BUF_SIZE. Later, when / if these objects start to get into order-10+ allocations for PQC etc, a scatter-gather mechanism will need to be considered.