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Peter Anvin" , Peter Zijlstra , "Pavan Kumar Paluri" , Dhaval Giani Subject: [PATCH v6 0/2] nosnp sev command line support Date: Thu, 10 Oct 2024 07:14:53 -0500 Message-ID: <20241010121455.15795-1-papaluri@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev 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: DS3PEPF0000C37B:EE_|DM4PR12MB7694:EE_ X-MS-Office365-Filtering-Correlation-Id: f6f79fbf-f4d0-4593-a489-08dce9252ba1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?qZjZz+HcqztRHqj0YY3VZSSwcl0xgYWxE2O1ME0VH/lrbtcw9C229up/UmSg?= =?us-ascii?Q?1ll6cfRq6DVWVlOVVkUeJuKokhUDeS06ajUtX6MOy/PuKQr/BlDPIg42wtUi?= =?us-ascii?Q?vSPxt1blIOI14qlC4DntG0OeQFtZZArZEpNYcvUFJrNmjfdPxIhPVSBpRO2n?= =?us-ascii?Q?oyR2cus+h8UM+hNQHc6EzqrVTJ2wYDPhzW/aCxQBNlzF0mZl1Bmtd/4PPLrd?= =?us-ascii?Q?BrSPL06uDAfl2e/OYLpIrFSX8u+V5EVXPQIfRs3sqaxAhLZJkY0bhGRaTWO2?= =?us-ascii?Q?DxXSvbkzmEW9yjP/SdctYs7o3gqt67/bV8N6S4sdMCJD0vrqE4T+wWmY2C04?= =?us-ascii?Q?gy7OMQphMAG5Ba0J/5+rOtBPAqw2dCU8cW1YL6AJzJsehdZBOd9rhpIktvCe?= =?us-ascii?Q?bUS+rZJyNI2DF9G+7sYg8oS5CQ8eIzj8PowaPOCWPFMI6YJcEG2DxhSw1E33?= =?us-ascii?Q?vPQC370eiD2l7j8lr6YnRP0BTwyoCYNAVoHo7Ocu8h37PwYgwz7nCfb0Tkky?= =?us-ascii?Q?uIPo0gyDdBSsCLdE3dqujg61GMwQWbhFs+24+AEcMViXNaLjiWgURd6CCHyF?= =?us-ascii?Q?Mr46YomsSrAAXzhOaKc1n0jqt96izqxxnNEcLPbwxY1soTv3WqouZRnkOXQ2?= =?us-ascii?Q?LB6sYc2rPojcQT990fBaIzw3wVEI8mIbsuWpQb33YcZY+ZbkIpED0Fmf4ddz?= =?us-ascii?Q?BxE4L1zCWqYnV6rU3sjkpTxKVqZhNGIB/UClb3GS6YS+whpsXRGjWlrpVKX6?= =?us-ascii?Q?tplgLUe+bAuobvlzOqj+Oj0RaGLftQTw2EGOKGPlRl9Q8ta7vFB3B6awWU5V?= =?us-ascii?Q?YlQ+HHUQrNDlqLOX1M0XaqBEHG5/nTDzkI7hbZie677GisKlI+46VNowgSuD?= =?us-ascii?Q?SRB0T9DXGwx8C+dKlHOxYU9bXLGei8i8V5y25yWEBCA3VlNHupp4taVOUiHt?= =?us-ascii?Q?ty3AdNuVEo0r6/Di3rT0boHJstapCp67FNvc55lTRMj8LtryhqgnzTlt7oG1?= =?us-ascii?Q?wf2PC0DGZ+FNM9uRU+3iBwgEixheWVwDOjl7FkGNr51/ZGtrkLYkBA7ZKrxf?= =?us-ascii?Q?A+syi2hFgPujec83HhJh+4ARLwuLXVRHMDD9NrbjoA88GW069Ro7fUK0rWSb?= =?us-ascii?Q?ti0MJPrzlv9x5szca/12qIDZr4kDMTzQScoS/UWuG0SF2WU++SOxIvQpzlMp?= =?us-ascii?Q?7n8L342SXb2fweZcuuQl7IqZTu34j2jS0V+UJTJBZna6JbrXIXisuJe8aNQI?= =?us-ascii?Q?X8E8DGa53OtReegHrXYBGaxlMYDsLXw/KuFmRGWYaH9Ke6NqOrGjNvWe4U5s?= =?us-ascii?Q?ysbw3KAWADz4sbLgPN4Q3qnHv5JXJyywZ4g3IRfZnj6SrWVodipHR+qsEMCU?= =?us-ascii?Q?y9gLOjOeB5owIDMTJC8txdLlY610?= 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)(82310400026)(376014)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Oct 2024 12:15:03.3280 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f6f79fbf-f4d0-4593-a489-08dce9252ba1 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: DS3PEPF0000C37B.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7694 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: ========= 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 | 39 ++++++++++++++++ 5 files changed, 72 insertions(+), 44 deletions(-) create mode 100644 arch/x86/virt/svm/cmdline.c base-commit: 00d91979d23c88d3f50870e22fc9cec3f5e26a2a -- 2.34.1