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Sampat" To: , , CC: , , , , , , , , , , , Subject: [Patch v3 4/4] x86/hyperv: Add guest support for Enhanced SMT Protection Date: Fri, 16 Oct 2026 21:54:07 +0000 Message-ID: <32abec5508bb39420b713e3960233979a520e4e9.1792184487.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: PH7PEPF00000007:EE_|AT6PR12MB255547:EE_ X-MS-Office365-Filtering-Correlation-Id: b2296f63-0fc5-4714-cc16-08df2bd021d7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|376014|1800799024|23010399003|10067099003|18002099003|22082099003|11063799006|56012099006; X-Microsoft-Antispam-Message-Info: uMa609eOENguS2X8e/eAQCN2lzKYN31uF1uf2wuqb7SSQAliCKWlUjynIscDnk6xTnM3J4LdZWV4H443Y17vmGUWF1KaB6zNGA0JpSNw9CjNRb1rTqM/sb2g1kXRplFc3ivcabfi9ipVAZADc8G9a8impzS6UmXCs0wmAKa2sLvMgzvo1WwNgQNe9qnIQbsH3w/JuQUd/3FDvB9dFGvs2n9U8ALOxS97irdDvOPU+2DU5qNsnL8jzjkJ3rH4ddpHJJZh1Ro+Q+5VfjHmC5fO36CWS28YP1GxDt0H2O69IQABgR4JUEhN5hKzeou3kvqG5n7ujEQCH+YcXl8bN/mpmQd8QUQmPLVSsjS/yI22Oam+f8UESQ4LkyBUXAs76f6GTeg4+C5PPeuyPFsNTkoi92+tcbOrKuJP0SrnWl/h9XJtg/cHenO0jIpAqPbZvyHP/XhouOT00OzBIrjOG7jZ46XCDk86mcbK/Rkak2Xa4elxLtposyAKWmJayZOo8UeeOn9DoDBTNatZihjZEghwFrxXveYN5+dYtPrGVpeiWDH9poPaLeeZpccodZpfhECvCo4N3Sas9tZJmKHzq4UBb+Nvj14LELPs4Cx304K2jQra4pPvlYbmExQ+2x2LK+a21I9GmNsT0iFs/+HMb044kN4d1zJU5lmwnPApZwRZPIegKgbZDJarmVWRUoap+JqDXOjSXDG/OdyCyygy9bMR5Q== 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)(36860700016)(82310400026)(376014)(1800799024)(23010399003)(10067099003)(18002099003)(22082099003)(11063799006)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: S8d4I2RiTOAmtvCwRNqlLTKymq5SKqsL1eAUyCqLuWOc3BmcAO9DiZxbsblr4cZrUd4FVFUW2I7/fbvTVfg4LZf1D7uw1vgBx0qQo9TYg0T0S7Ojvttm5OoAIh41WS39iz8PZrFH4iWrxpuhYdIjIPYKGJBdw9fE3VXO0gQZCUgNnupTlse65NfWgi9FJV03ZGTWJgegbGwsNhCoGkTtrZtVJIzlAK89dANO7JR9wczaHFToh6kSmrP5PRnidgjYtfp71E6Qk9W4/OHzk0JRRYtTVFVs8LhxjwRjoqK0OCZeN9ob/TdyMMH7/2PA2Zqjdm8EF6g6KcPOUxfrgRLHo88TGTAka3EvaACeJWnWxTLK0XSkCqHroGA5cKrOJXcUcsuYKSl8TwUPMVsew/jcm+292JqHAqKiduQjRioirR/c5nBtEaKdodNokJ5h0eDv X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2026 21:55:03.0151 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b2296f63-0fc5-4714-cc16-08df2bd021d7 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: PH7PEPF00000007.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AT6PR12MB255547 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 --- v2..v3: No changes 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