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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ1PEPF00002312.mail.protection.outlook.com (10.167.242.166) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.270.5 via Frontend Transport; Thu, 23 Jul 2026 05:59:07 +0000 Received: from satlexmb07.amd.com (10.181.42.216) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Thu, 23 Jul 2026 00:59:03 -0500 Received: from [172.31.184.125] (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Thu, 23 Jul 2026 00:58:53 -0500 Message-ID: <70580cfc-8625-4f35-a77b-7154a52e10a5@amd.com> Date: Thu, 23 Jul 2026 11:28:47 +0530 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 2/6] x86/sev: Initialize RMPOPT configuration MSRs To: Borislav Petkov CC: Ashish Kalra , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <8518e02c46d6edf1f37a180569c708a3cfa7c413.1782841284.git.ashish.kalra@amd.com> <20260723011031.GGamFqB1i4zt4Zlsx6@fat_crate.local> <9cfe76f4-8e16-4b21-a414-126a06859489@amd.com> <20260723051422.GGamGjLhlTqRDcFlee@fat_crate.local> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <20260723051422.GGamGjLhlTqRDcFlee@fat_crate.local> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: eRJVf0Ixcc4gR0rTZejdQEThRVArvBCqqT3bjzEsOGHgxhRnMThsKd9D73AZmOtO3/cpwQqMN/ggdR7mZtgnwNFWL7zJhc08ZmPDmDJXCsE225Wlsn0KxibI669qoXdHy+AWtwfhX2RWyS8/xAvKnyJoo8tlMCbbUQYI5NcSEdjTvQUNkQna6Ma6jgSgApMXVD5hAVXDLzaGhiMHGsX321NUPSP11rydRwfbO5SQnBJE6pGOvSnVbqH1UsvX69R2vvoFo0a0lTyxrP6YNJw2EPzd2fRIov4B6kLH6E54k5nA42GGLg+cv1NW3SmuQbJL6oVPXZhNKdQlwhbKPUyHMey28RYNxzmGt9zlH3AV9kxZ/FarOnXDSnDdR4/dhS/RMGEd/BXhp1l0ViA6Zq1VgpdnjW6TpICe6F89mlKik/VP78sKyUDPcGvP5NF3lgk0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jul 2026 05:59:07.2739 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b9913147-35b1-4cda-62b3-08dee87f820b 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002312.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8717 Hello Boris, On 7/23/2026 10:44 AM, Borislav Petkov wrote: > On Thu, Jul 23, 2026 at 10:23:56AM +0530, K Prateek Nayak wrote: >> The offline cores will remain offline since hotplug is disabled. RMPOPT >> is simply a performance optimization for RMP checks and leaving the >> offline cores (that will never exit idle) unoptimized should be >> acceptable. > > What happens if you boot with a subset of cores, the boot flow enables RMPOPT > and then you online the rest? RMPOPT happens at __sev_snp_init_locked() for all online cores. Until then, SnpEn is still 0 and we don't need RMPOPT because RMP checks haven't been enabled yet. > > Have we tried that? That said, Ashish, should snp_rmptable_init() do a snp_rmpopt_all_physmem() (or something equivalent) when it finds SNP_EN set in MSR_AMD64_SYSCFG after a kexec? -- Thanks and Regards, Prateek