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Sampat" To: , , , , CC: , , , , , , , , , , , , , , Subject: [PATCH v6 9/9] KVM: selftests: Add a basic SEV-SNP smoke test Date: Mon, 3 Feb 2025 16:32:05 -0600 Message-ID: <20250203223205.36121-10-prsampat@amd.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250203223205.36121-1-prsampat@amd.com> References: <20250203223205.36121-1-prsampat@amd.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: SN1PEPF0002BA52:EE_|MW5PR12MB5599:EE_ X-MS-Office365-Filtering-Correlation-Id: 9c1566f9-3a56-4293-b237-08dd44a2e1ee X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|376014|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: +xiATD8DH8VnUlLZQy2uhFLJxLlxBXD3nUCnra4qGkLPoPtVo76abBAR/Y4ik7oqXmmHXUMbkDmtwWYr18qMm7RTno/r/g4QnQBSuM8MeF3l/5+v9MPe4Raz02AUuncQx2uM4V+V71h+Fgpr9cBxAjWQa5o2w6To0qPWW6Vr4DxjYwo+VoqeiWthr7kf0IxgG4RJXg000qaxav4TXw7MhXi5IXIli2hJgPpLVFgqkwqmXg+RcOL8TD0MmqR16XFxiXa6mDBTr9MZOo5aypKsqk9MBVYgJEyHFzOxloHuIHWxfRaIPHtowIPWkqArjIj7T+8NDqmtW/NORlsVNazw9C01jB3RBMZzLW/2hQ1WFkoR062A0MalkprIPI3Qc/AFyniqesITHsGIHfUpTzFVqfPM/yvFmWEFi5iFcAUUMBmRU2yXkyVMmoPm0agr+sNt0AC+z/avygGankJQMW6B/GqAPnV4PLSovBDviish3glK6cgliNPPNpEvhfu/fCMkJn6qy7KKXSsUU7gjm6SxmAQHSyl/M9WX8kMMU8u7fTgQ7xlCOX8EzWmDeiiZsZ8YayUPEIVL9PKh/2UZ3hWW5szc+VJUVLoFYuj9ySZeKd0bMGOhZ02PiUqX6tJazIGDfrhLrRjYg9pmoImZXVg59oiOqdUKxMG4G7tqsxe1ClNu3D1G4zS5u6lgT6uxkuZrrQ7vr50Ck+NzyyXYJ9I3+ocDbSAeibQnThUl/hSxBLeS9IWKZvoFU4hFtBT4hjFbAJsd+1e2pFm92vvZZrCaq6pVLer7pJxDvUf9/aNgJfeJDyGHZScMzA8Hcohwytl67fmWpTXKdJvY7B79T3iiBAw3MTNT646XtRXYYdI3DvtwQJPhMTPWzJDsBr7F1ftNBdSAQU5mUB1P1WICcWR64nfZwmaech6AhADPJoeRRaGqV3BrNA5WLBjeRTd27Um6D0/RS9bE4AO1F/J4SYnAE2yQWpaxFsQs7K/DbGFXzohTopSnhqUnaLWj9BGQNp29Jg+FgICkeASvccZ8ol3KenYa0c5loSeG1SOreN1Tb++D6Z5RWHZNyUqB5wUqMhRqshOdk/rm5oK156WIaDWAueQfm+0tbX4oK9rRfMYYr9p8kvzQTPn0DxgX4zDO3qny5C2b1XqIHfBV3D2xn6bTjzmqgeZt82w+cai52JkRP+yBLJzt3vKv/jIW3szQxEN30BxLbxdm05BtMv/MMPpz0VCJcFQxs2XRBvu0FwHZG8h3JD2ZgrcpsrCMzJyik+VJ6wk84owW4mLuXlJy4UQVKkSnbKO9sH5/AAJZ2nVdcIB1Ii2CCvtzpPnGaRT/iAc2wsxCGsACyvU9ONhf95KRt5c5XWWmaS/MN9N3gYxhV3fAiSY/M2qh3rJZVWXAsx1tPa5qPFPL93ZA7TlN5r1jLQJMxPt4zNnh167oEGLjGCVWUCYtfOeYXM2D1qcCfdB1IwA/uEG963HptsWu/fky3zxXIHeogScUj+iuUVmHTj0= 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)(7416014)(376014)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Feb 2025 22:34:12.1604 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9c1566f9-3a56-4293-b237-08dd44a2e1ee 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: SN1PEPF0002BA52.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW5PR12MB5599 Extend sev_smoke_test to also run a minimal SEV-SNP smoke test that initializes and sets up private memory regions required to run a simple SEV-SNP guest. Similar to its SEV-ES smoke test counterpart, this also does not support GHCB and ucall yet and uses the GHCB MSR protocol to trigger an exit of the type KVM_EXIT_SYSTEM_EVENT. Tested-by: Srikanth Aithal Signed-off-by: Pratik R. Sampat --- v5..v6: * Rename KVM CPU feature X86_FEATURE_SNP to X86_FEATURE_SEV_SNP (Nikunj) * Collected tags from Srikanth. --- .../selftests/kvm/x86/sev_smoke_test.c | 42 +++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testing/selftests/kvm/x86/sev_smoke_test.c index 3a36cd3ca151..3336550152c0 100644 --- a/tools/testing/selftests/kvm/x86/sev_smoke_test.c +++ b/tools/testing/selftests/kvm/x86/sev_smoke_test.c @@ -16,6 +16,18 @@ #define XFEATURE_MASK_X87_AVX (XFEATURE_MASK_FP | XFEATURE_MASK_SSE | XFEATURE_MASK_YMM) +static void guest_snp_code(void) +{ + uint64_t sev_msr = rdmsr(MSR_AMD64_SEV); + + GUEST_ASSERT(sev_msr & MSR_AMD64_SEV_ENABLED); + GUEST_ASSERT(sev_msr & MSR_AMD64_SEV_ES_ENABLED); + GUEST_ASSERT(sev_msr & MSR_AMD64_SEV_SNP_ENABLED); + + wrmsr(MSR_AMD64_SEV_ES_GHCB, GHCB_MSR_TERM_REQ); + VMGEXIT(); +} + static void guest_sev_es_code(void) { /* TODO: Check CPUID after GHCB-based hypercall support is added. */ @@ -157,11 +169,21 @@ static void test_sev_es(uint64_t policy) __test_sev(guest_sev_es_code, KVM_X86_SEV_ES_VM, policy); } +static void test_snp(uint64_t policy) +{ + __test_sev(guest_snp_code, KVM_X86_SNP_VM, policy); +} + static void test_sync_vmsa_sev_es(uint64_t policy) { __test_sync_vmsa(KVM_X86_SEV_ES_VM, policy); } +static void test_sync_vmsa_snp(uint64_t policy) +{ + __test_sync_vmsa(KVM_X86_SNP_VM, policy); +} + static void guest_shutdown_code(void) { struct desc_ptr idt; @@ -195,6 +217,11 @@ static void test_sev_es_shutdown(uint64_t policy) __test_sev_shutdown(KVM_X86_SEV_ES_VM, SEV_POLICY_ES); } +static void test_snp_shutdown(uint64_t policy) +{ + __test_sev_shutdown(KVM_X86_SNP_VM, policy); +} + int main(int argc, char *argv[]) { const u64 xf_mask = XFEATURE_MASK_X87_AVX; @@ -217,5 +244,20 @@ int main(int argc, char *argv[]) } } + if (kvm_cpu_has(X86_FEATURE_SEV_SNP)) { + uint64_t snp_policy = snp_default_policy(); + + test_snp(snp_policy); + /* Test minimum firmware level */ + test_snp(snp_policy | SNP_FW_VER_MAJOR(SNP_MIN_API_MAJOR) | + SNP_FW_VER_MINOR(SNP_MIN_API_MINOR)); + + test_snp_shutdown(snp_policy); + + if (kvm_has_cap(KVM_CAP_XCRS) && + (xgetbv(0) & kvm_cpu_supported_xcr0() & xf_mask) == xf_mask) + test_sync_vmsa_snp(snp_policy); + } + return 0; }