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Peter Anvin" , Andy Lutomirski , Peter Zijlstra , "Williams, Dan J" , Michael Roth , Ashish Kalra , "Shutemov, Kirill" , "Dong, Eddie" , Jeremi Piotrowski References: <447b491f-ae1a-85db-a862-0a2b999cd0d4@amd.com> From: Tom Lendacky In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SN7PR04CA0112.namprd04.prod.outlook.com (2603:10b6:806:122::27) To BL1PR12MB5732.namprd12.prod.outlook.com (2603:10b6:208:387::17) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL1PR12MB5732:EE_|SA1PR12MB8844:EE_ X-MS-Office365-Filtering-Correlation-Id: d3d9caef-fef2-4c05-19b4-08dc34ad4fbc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL1PR12MB5732.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031);DIR:OUT;SFP:1101; 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HV == Hypervisor > >> > > Kirill already commented on this, and the answer is of course we can, but imo we > need to see a bigger picture first. If we go with option 2 above, then coming with a > joint protocol is only limitedly useful because likely we wont be able to share the > code in the guest kernel. Ideally I think we want a common concept and a common > protocol that we can share in both guest kernel and coconut-svsm. > > Btw, is continuing discussion here the best/preferred/efficient way forward? Or should we > setup a call with anyone who is interested in the topic to form a joint understanding > on what can be done here? I'm not sure what the best way forward is since I'm not sure what a common concept / common protocol would look like. If you feel we can effectively describe it via email, then we should continue that, maybe on a new thread under linux-coco. If not, then a call might be best. Thanks, Tom > > Best Regards, > Elena. > > >> >> Thanks, >> Tom >> >>> >>> 5. Anything else is missing? >>> >>> References: >>> >>> [1] https://lkml.org/lkml/2023/11/22/1089 >>> >>> [2] MSFT hyper-v implementation of AMD SEV-SNP !VMPL0 guest and TDX L2 >>> partitioning guest: >>> https://elixir.bootlin.com/linux/latest/source/arch/x86/hyperv/ivm.c#L575 >>> >>> [3] https://github.com/coconut-svsm/svsm >>> >>> [4] https://www.amd.com/content/dam/amd/en/documents/epyc-technical- >> docs/specifications/58019.pdf >>> >>>