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Sampat" To: , , CC: , , , , , , , , , , , Subject: [Patch v2 4/4] x86/hyperv: Add guest support for Enhanced SMT Protection Date: Tue, 6 Oct 2026 16:55:01 +0000 Message-ID: <3bec0f45fc1ea446070cda4339b407c8085f6eb1.1791302373.git.prsampat@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: 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: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY1PEPF000264B5:EE_|DS0PR12MB9424:EE_ X-MS-Office365-Filtering-Correlation-Id: 381e9399-8893-4946-b8da-08df23cab118 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|36860700016|1800799024|82310400026|11063799006|10067099003|56012099006|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(23010399003)(376014)(36860700016)(1800799024)(82310400026)(11063799006)(10067099003)(56012099006)(18002099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Sopl+s1gxgcDzlXGsn5b26r861T6JFUCBGhWQ7ZO62nplSz48kzc40prZEXq/OLSfsy6m0uazhvXqeYfrpfXOezesuBL6sHGaoCPkqLJdtevDJV21OSdHYzUUoxcRFE1C3qppAEp2npCRDrE0lcCaLipKwLwr7KWLBGEHwZnwJqbM1LucUGSM4i8/5ReONGhAHQfdbAw3P3uIfB1piH/yuOas7ZkrbRV0fqeUgx+Zn88p0dZA40iDtLHdun6Q8YcAVFtcn3rqfZjwpg6w05/ZGOZhTsjcJy+e8Rx/u4Jvo+KR7+Y8H4eu+VvZPNB4sueiiZzPerTZOZN95/SZfmUWLdRYzZDGenpoa74g42XSiC8302CfKUv1QMWjHcYA0acFr9ih1f6CCRPpypOluELJYIoU9mOkefFj+cKzvhgdXCkFqMH3t5z17ZfmX67pIPO X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Oct 2026 16:55:57.0158 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 381e9399-8893-4946-b8da-08df23cab118 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: BY1PEPF000264B5.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB9424 Add corresponding hyperv support for Enhanced SMT protection. A fully enlightened SEV-SNP guest on Hyper-V builds the VMSA itself when bringing up an AP, so populate both fields there, before the page is turned into a VMSA and while it is still writable. Similar to KVM, fully set the sibling mask so that all threads of the same guest trust each other. Signed-off-by: Pratik R. Sampat --- v1..v2: New patch --- arch/x86/hyperv/ivm.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 2ce4dfe53472..40dd252f333a 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -347,6 +347,17 @@ int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip, unsigned int cpu) vmsa->vmpl = 0; vmsa->sev_features = sev_status >> 2; + if (sev_status & MSR_AMD64_SNP_ESMT_PROT) { + vmsa->vcpu_id = apic_id; + /* + * The mask fully set puts every vCPU in one group, so any two + * of them may be co-resident. A legal ESMTP sibling must + * also match on ASID, so the sibling of a vCPU in guest mode is + * always either another vCPU of this same guest or idle. + */ + vmsa->vcpu_sibling_mask = U32_MAX; + } + ret = snp_set_vmsa(vmsa, true); if (ret) { pr_err("RMPADJUST(%llx) failed: %llx\n", (u64)vmsa, ret); -- 2.43.0