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Peter Anvin" , Peter Zijlstra , "Pavan Kumar Paluri" , Dhaval Giani Subject: [PATCH v7 0/2] nosnp sev command line support Date: Mon, 14 Oct 2024 08:09:46 -0500 Message-ID: <20241014130948.1476946-1-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: CO1PEPF000044F3:EE_|SJ2PR12MB8690:EE_ X-MS-Office365-Filtering-Correlation-Id: 553dea2b-0673-468e-79ed-08dcec518060 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?cM6Xr9uNVzZREHbahf/H08fP1Lmwi3DjQVkuLitpuAzpinQbL4GeHBEJh9Rf?= =?us-ascii?Q?IExllhxV5Vilw8FIsN1IT/bVf4YWtLab8K+iKPeR4ZKuyThCg/AUe7P+4ewR?= =?us-ascii?Q?D7sdOJlFpNjkGoDBRD2lcRVz8N5K43cv3S6NKS9kXUdKIeXr5EYfBVZAfXMi?= =?us-ascii?Q?Y0PEhBmMB3hg/d1b9A/ha4VCGG6XUtFOx20EEU7fVYIyAIj52CIWwHF3QYbl?= =?us-ascii?Q?YbJJA1C5e5/+QfB/UZciOlDNWWQX7mXX9DUStb/oi4Def/R/j8aiy7MwgYHQ?= =?us-ascii?Q?LmlRikSz1HuwsPMUxNZS4V0Spge/CgbzyVM2Xs+yf2RrGIqc4LA6KslEkQUM?= =?us-ascii?Q?8qrWIJhBqsoOhd1D1v5Gg3Gg/GT23fXzBnyB3a5eyx+FVviqbVVf61kGdRt+?= =?us-ascii?Q?zi1y5NRArqaGZitqIR37e3SRRUWwGvwuMw5jfssOwZjWRKmtK9z5L4z1XdEn?= =?us-ascii?Q?LWHHQHLCnbB5Ttyo5paltyvbF6m1QTerUbNdHr3vLJe6uvClm96jafEGeEQV?= =?us-ascii?Q?vHF6Zu0P0LO3ttOIqTbwutyw2VK5zdd67WUfttfNoCD5hel9a/v4LRLSH7EB?= =?us-ascii?Q?Ea6+CHlaXfryejmyfeAVrg208mjvveYeZriQK9SGlzoMPTgBGK5HI+r4xMdD?= =?us-ascii?Q?geV1eWKUnuSnlK7B6OeHsypYeOTyTtYCr4tx62VTCEgl5SmbgblHTXwHIF4e?= =?us-ascii?Q?TLYBVISNXURi4+3N/a3kbNqBvQct+QYTt3WF6FYqkgVnbFiL4RybBwawWqOb?= =?us-ascii?Q?AYpFL3h6pIufZecdjMaUIol0Hd3YGM39bKKZ4NlJ9CWURPE+YGt8h1nNQ22l?= =?us-ascii?Q?gyfgaxMS2wQF82Kyoi52oCZqN1waglLTRucvxmrtenLhZoKiMiYTH9vSJ80/?= =?us-ascii?Q?nT7nAIIrw6w0gmfOqzCR5HBKuvwdeUTu0Hagp3iwKmPtb6EiaoyVpP1aHHOE?= =?us-ascii?Q?Rew11ydLXviPneqqsaKL86zxUIegw5NUgaLDVW8WljQS74rgLGHN7pNQSfoF?= =?us-ascii?Q?OdAIrFKVrRcpC9EoAUmadKoxVT3JVx30DdVvqBhKSNLM1rlhs6FtT6r+Nkf4?= =?us-ascii?Q?6XGfsCGjf4rU8Vka1AQpQIT2PqhGSbXi+Mvu/LYK8lrF2YRfS7DBH+7WtcoK?= =?us-ascii?Q?+UzxBvOHznMteJoyrbfti6+eAe8pjN+oHNtHvH782/D37SR97TYNEMGvBCEI?= =?us-ascii?Q?sCwMwX+wgq+tSUR8Hal+X+SRmDSz1CC/wV+cXyia5w/JTqky1Kk/kfGffxoZ?= =?us-ascii?Q?xc3v/vmbfproYQL2Jes2V3BEQ/JBzX2FCU8lfaUCvfLI0aVegFoiflzCzEYw?= =?us-ascii?Q?ychjhev5R/G5Aizjsh1nHW7rVdZBjZpwMar/uYPlhTYuq+L2Jw6snObbzCLI?= =?us-ascii?Q?gG9Zngytk9IUodtj0X7w7EIKV8ko?= 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)(376014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Oct 2024 13:09:56.8205 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 553dea2b-0673-468e-79ed-08dcec518060 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: CO1PEPF000044F3.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8690 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) Setting 'nosnp' avoids the RMP check overhead in memory accesses when users do not want to run SEV-SNP guests. On providing sev=nosnp via kernel command line: cat /sys/module/kvm_amd/parameters/sev_snp should be "N". The 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: ========= v6: * was not included in virt/svm/cmdline.c, which was breaking the progressive build. Fix this issue (Boris) * Link: https://lore.kernel.org/all/20241010121455.15795-1-papaluri@amd.com/ v5: * Update cover-letter and Documentation to include information on why nosnp command line option is required (Dave Hansen) * Remove stray header introduced in the previous versions because of __read_mostly attribute that is now moved into virt/svm/cmdline.c * Link: https://lore.kernel.org/all/20240930231102.123403-1-papaluri@amd.com/ v4: * Move __read_mostly attribute to place where sev_cfg is declared (Tom) * Link: https://lore.kernel.org/all/20240922033626.29038-1-papaluri@amd.com/ 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 | 5 +++ arch/x86/coco/sev/core.c | 44 ------------------- arch/x86/include/asm/sev-common.h | 27 ++++++++++++ arch/x86/virt/svm/Makefile | 1 + arch/x86/virt/svm/cmdline.c | 40 +++++++++++++++++ 5 files changed, 73 insertions(+), 44 deletions(-) create mode 100644 arch/x86/virt/svm/cmdline.c base-commit: 00d91979d23c88d3f50870e22fc9cec3f5e26a2a -- 2.34.1