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Peter Anvin" , "Peter Zijlstra" , Pavan Kumar Paluri Subject: [PATCH v2 0/2] nosnp sev command line support Date: Mon, 2 Sep 2024 19:35:09 -0500 Message-ID: <20240903003511.1530454-1-papaluri@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF0000231C:EE_|SJ2PR12MB8011:EE_ X-MS-Office365-Filtering-Correlation-Id: 9d6df92f-11cb-44ad-7b17-08dccbb049f5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|82310400026|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?BLEJ0LaxVgmZPnsn8xDjJ0v8tZhV0Ik3wR1siQFYbyz3mOQxwN0n3HrfFQ+D?= =?us-ascii?Q?LcO7XTFhZ4cqRaf3+jMWrmP5kyZ71Aeh3uhNQpTzUU71cR+7UpBmMEAAA1FE?= =?us-ascii?Q?JUH2ud5E8M4FabiyPJVZ/jZjlt0Irk5CPUOykqTjyZQe3Ytq0hZFez9QC6Hg?= =?us-ascii?Q?beqM+owYV/K4nS9LC5IfgvYVE8QFXgIGpxNYnpGJ4d/rtXwC6HDAWA1V5jIx?= =?us-ascii?Q?tyzskQeQgL8mXxqWaG9bLFn/SPKn3Uv2Z17GNbj7kORkPN4Ckha2PVU0SVam?= =?us-ascii?Q?Za1YK4ba55JZ+NzeU5uOl9iGvIyBUR48+g4TaciG6YxZx0TnOeG89Pi7vsgb?= =?us-ascii?Q?pnOBAfjbCXpmyXEBFDwV5j6L8nZByLBssNI4PUszdTFCgnn1rh0yjvoXD2WV?= =?us-ascii?Q?dmNQ7NmzxhfCIIbrBVRkfwWIdSrA0YFkElPjx+y+LiPFh01NZ7oG9Ih6tDVI?= =?us-ascii?Q?9+02XxSJxJh4zRhhU4Ps/x3bupk6dqT8kQO/n+T3+3LwR+0JG5yBZDHnbZro?= =?us-ascii?Q?LnkQBKsZU4NYaEbFYQQqF9RrTg45JOgRxNhPU5tuDDukJg6szib6TdQTGRFJ?= =?us-ascii?Q?cGbgBWfEHV0SPAPioXpf2yHjiARl3Duu4p060bJzk7F9mAMchqtOZEMGAYUy?= =?us-ascii?Q?4eh+C1Ox6rvWqqZcf4fPxCJeIiScHXP4O6c1KnHANZCmKGhq2J/1EbkGA1wn?= =?us-ascii?Q?DYwl32jFRsqTeMVWT2Y3xKQacfQEwG8i5Kizk0o0iQelg/8tKaNdCwrPK43i?= =?us-ascii?Q?+31dSuGV/eJ8HJrHCtT8A1WTHAobT2kBZLdmwjRr6zOwCoE23Iyj4MTFKhUp?= =?us-ascii?Q?OU6IRgrUfp97qXACKMB/r7QQfVO4ta4ncPIw4qcITk7KyRz69kUtMKP+JGjJ?= =?us-ascii?Q?ApJYvC6oRqwAy605jLQBzce3vgxXgYfDzGa/iJxcpsMgiOb6rCkEdU+7pVZ1?= =?us-ascii?Q?ctG7G5kntcvVcW/2GV1cPeFffW+oOw348o1tnISEO+6ejj/kN8jAnZHTh4xY?= =?us-ascii?Q?Ou8bTjCsEBJdwuqO+D8lZAu0Oa1mQyuuJOj/xdlM8qdCH5TCcnXotOfnPLNE?= =?us-ascii?Q?tBVP/RZngbeA31I9n0ETcOs2+A/AQsUyzY9/VgENkfOw7rpNXWjlpoVaEmyn?= =?us-ascii?Q?2KlvUTABlRto0gk7aGYoHJo6CwbvO6YNwux47N+7INGbtkrAlfOdiKu0fasF?= =?us-ascii?Q?c6a2LpdXsOYqyfJdZVI/DK/sM3VtHhLKBHuY1Ocb/vfZteArsAW9tLDv5ZqG?= =?us-ascii?Q?7jbzk9cn3dVBqGdy98Oy7YvyrtJ/bSCYV/wT22JmBWGaXib5Kog+lmjpbslS?= =?us-ascii?Q?s0S9nu3B43qilRV1bIAjGkBgKgqSxc3t4rvS55aE9W08cP7BuH3R/ynUdBeN?= =?us-ascii?Q?dJ35yKZ/OUtz/Fun4KoXqyEKx6mBVMzUT4U1yLIyeLzjvR8F2knwOpc9GLN1?= =?us-ascii?Q?Qub4YJ+rV0GqgbnKb6xc8iGdpsZ1ylPQ?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(376014)(82310400026)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Sep 2024 00:35:19.2462 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9d6df92f-11cb-44ad-7b17-08dccbb049f5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF0000231C.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8011 Provide "nosnp" boot option via "sev=nosnp" kernel command line to prevent SEV-SNP[1] capable host kernel from enabling SEV-SNP and initializing Reverse Map Table (RMP) [1]. On providing sev=nosnp via kernel command line: cat /sys/module/kvm_amd/parameters/sev_snp should be "N". This patchset is based on tip/master. Reference: [1] https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/programmer-references/24593.pdf Changelog: v1->v2: * Pick R-b from Tom. * Include only those headers that provide the necessary definitions (Boris) * Provide appropriate references to SEV, SNP and RMP (Matthew) --- Pavan Kumar Paluri (2): x86, KVM:SVM: Move sev specific parsing into arch/x86/virt/svm x86 KVM:SVM: Provide "nosnp" boot option for sev kernel command line .../arch/x86/x86_64/boot-options.rst | 3 ++ arch/x86/coco/sev/core.c | 44 ------------------- arch/x86/include/asm/sev-common.h | 30 +++++++++++++ arch/x86/virt/svm/Makefile | 1 + arch/x86/virt/svm/cmdline.c | 39 ++++++++++++++++ 5 files changed, 73 insertions(+), 44 deletions(-) create mode 100644 arch/x86/virt/svm/cmdline.c base-commit: a85536e1bce722cb184abbac98068217874bdd6e -- 2.34.1