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Peter Anvin" Subject: [RFC 13/16] KVM: selftests: add support for creating SEV-SNP guests Date: Tue, 5 Oct 2021 18:44:56 -0500 Message-Id: <20211005234459.430873-14-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211005234459.430873-1-michael.roth@amd.com> References: <20211005234459.430873-1-michael.roth@amd.com> X-ClientProxiedBy: SA0PR12CA0028.namprd12.prod.outlook.com (2603:10b6:806:6f::33) To CH2PR12MB4133.namprd12.prod.outlook.com (2603:10b6:610:7a::13) MIME-Version: 1.0 Received: from localhost (165.204.77.1) by SA0PR12CA0028.namprd12.prod.outlook.com (2603:10b6:806:6f::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.18 via Frontend Transport; Tue, 5 Oct 2021 23:45:52 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c16ed738-1981-428a-6ad0-08d9885a4483 X-MS-TrafficTypeDiagnostic: CH2PR12MB3925: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:5;SRV:;IPV:NLI;SFV:SPM;H:CH2PR12MB4133.namprd12.prod.outlook.com;PTR:;CAT:OSPM;SFS:(4636009)(366004)(8936002)(5660300002)(6486002)(6916009)(316002)(8676002)(44832011)(26005)(54906003)(66946007)(38350700002)(66556008)(66476007)(83380400001)(38100700002)(52116002)(956004)(508600001)(36756003)(7416002)(86362001)(2616005)(4326008)(1076003)(6496006)(186003)(2906002)(23200700001);DIR:OUT;SFP:1501; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: c16ed738-1981-428a-6ad0-08d9885a4483 X-MS-Exchange-CrossTenant-AuthSource: CH2PR12MB4133.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Oct 2021 23:45:53.0759 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: z1lOS6WBwJ/hHoSKxIVD19B68fpDX+zF+dB8D02HeKi/2O+kS3JyGt7Fi7YK94iR7vQd4Kzf9JbITrtCie+aug== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB3925 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org SEV-SNP uses an entirely different set of KVM_SEV_* ioctls to manage guests. The needed vm_memcrypt callbacks are different as well. Address these differences by extending the SEV library with a new set of interfaces specific to creating/managing SEV-SNP guests. These guests will still use a struct sev_vm under the covers, so some existing sev_*() helpers are still applicable. Signed-off-by: Michael Roth --- .../selftests/kvm/include/x86_64/sev.h | 8 ++ tools/testing/selftests/kvm/lib/x86_64/sev.c | 77 ++++++++++++++++++- 2 files changed, 82 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/kvm/include/x86_64/sev.h b/tools/testing/selftests/kvm/include/x86_64/sev.h index d2f41b131ecc..f3e088c03bdd 100644 --- a/tools/testing/selftests/kvm/include/x86_64/sev.h +++ b/tools/testing/selftests/kvm/include/x86_64/sev.h @@ -18,6 +18,10 @@ #define SEV_POLICY_NO_DBG (1UL << 0) #define SEV_POLICY_ES (1UL << 2) +#define SNP_POLICY_SMT (1ULL << 16) +#define SNP_POLICY_RSVD (1ULL << 17) +#define SNP_POLICY_DBG (1ULL << 19) + #define SEV_GUEST_ASSERT(sync, token, _cond) do { \ if (!(_cond)) \ sev_guest_abort(sync, token, 0); \ @@ -59,4 +63,8 @@ void sev_vm_launch(struct sev_vm *sev); void sev_vm_measure(struct sev_vm *sev, uint8_t *measurement); void sev_vm_launch_finish(struct sev_vm *sev); +struct sev_vm *sev_snp_vm_create(uint64_t policy, uint64_t npages); +void sev_snp_vm_free(struct sev_vm *sev); +void sev_snp_vm_launch(struct sev_vm *sev); + #endif /* SELFTEST_KVM_SEV_H */ diff --git a/tools/testing/selftests/kvm/lib/x86_64/sev.c b/tools/testing/selftests/kvm/lib/x86_64/sev.c index d01b0f637ced..939d7d5dff41 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/sev.c +++ b/tools/testing/selftests/kvm/lib/x86_64/sev.c @@ -20,6 +20,7 @@ struct sev_vm { int fd; int enc_bit; uint32_t sev_policy; + uint64_t snp_policy; }; /* Helpers for coordinating between guests and test harness. */ @@ -119,6 +120,12 @@ void kvm_sev_ioctl(struct sev_vm *sev, int cmd, void *data) /* Local helpers. */ +static bool sev_snp_enabled(struct sev_vm *sev) +{ + /* RSVD is always 1 for SNP guests. */ + return sev->snp_policy & SNP_POLICY_RSVD; +} + static void sev_register_user_range(struct sev_vm *sev, void *hva, uint64_t size) { @@ -147,6 +154,21 @@ sev_encrypt_phy_range(struct sev_vm *sev, vm_paddr_t gpa, uint64_t size) kvm_sev_ioctl(sev, KVM_SEV_LAUNCH_UPDATE_DATA, &ksev_update_data); } +static void +sev_snp_encrypt_phy_range(struct sev_vm *sev, vm_paddr_t gpa, uint64_t size) +{ + struct kvm_sev_snp_launch_update update_data = {0}; + + pr_debug("encrypt_phy_range: addr: 0x%lx, size: %lu\n", gpa, size); + + update_data.uaddr = (__u64)addr_gpa2hva(sev->vm, gpa); + update_data.start_gfn = gpa >> PAGE_SHIFT; + update_data.len = size; + update_data.page_type = KVM_SEV_SNP_PAGE_TYPE_NORMAL; + + kvm_sev_ioctl(sev, KVM_SEV_SNP_LAUNCH_UPDATE, &update_data); +} + static void sev_encrypt(struct sev_vm *sev) { struct sparsebit *enc_phy_pages; @@ -171,9 +193,14 @@ static void sev_encrypt(struct sev_vm *sev) if (pg_cnt <= 0) pg_cnt = 1; - sev_encrypt_phy_range(sev, - gpa_start + pg * vm_get_page_size(vm), - pg_cnt * vm_get_page_size(vm)); + if (sev_snp_enabled(sev)) + sev_snp_encrypt_phy_range(sev, + gpa_start + pg * vm_get_page_size(vm), + pg_cnt * vm_get_page_size(vm)); + else + sev_encrypt_phy_range(sev, + gpa_start + pg * vm_get_page_size(vm), + pg_cnt * vm_get_page_size(vm)); pg += pg_cnt; } @@ -308,3 +335,47 @@ void sev_vm_launch_finish(struct sev_vm *sev) TEST_ASSERT(ksev_status.state == SEV_GSTATE_RUNNING, "Unexpected guest state: %d", ksev_status.state); } + +/* SEV-SNP VM implementation. */ + +struct sev_vm *sev_snp_vm_create(uint64_t policy, uint64_t npages) +{ + struct kvm_snp_init init = {0}; + struct sev_vm *sev; + struct kvm_vm *vm; + + vm = vm_create(VM_MODE_DEFAULT, 0, O_RDWR); + sev = sev_common_create(vm); + if (!sev) + return NULL; + sev->snp_policy = policy | SNP_POLICY_RSVD; + + kvm_sev_ioctl(sev, KVM_SEV_SNP_INIT, &init); + vm_set_memory_encryption(vm, true, true, sev->enc_bit); + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 0, 0, npages, 0); + sev_register_user_range(sev, addr_gpa2hva(vm, 0), npages * vm_get_page_size(vm)); + + pr_info("SEV-SNP guest created, policy: 0x%lx, size: %lu KB\n", + sev->snp_policy, npages * vm_get_page_size(vm) / 1024); + + return sev; +} + +void sev_snp_vm_free(struct sev_vm *sev) +{ + kvm_vm_free(sev->vm); + sev_common_free(sev); +} + +void sev_snp_vm_launch(struct sev_vm *sev) +{ + struct kvm_sev_snp_launch_start launch_start = {0}; + struct kvm_sev_snp_launch_update launch_finish = {0}; + + launch_start.policy = sev->snp_policy; + kvm_sev_ioctl(sev, KVM_SEV_SNP_LAUNCH_START, &launch_start); + + sev_encrypt(sev); + + kvm_sev_ioctl(sev, KVM_SEV_SNP_LAUNCH_FINISH, &launch_finish); +}