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Sampat" To: , , , , CC: , , , , , , , , , , , , , , Subject: [PATCH v7 07/10] KVM: selftests: Add library support for interacting with SNP Date: Fri, 21 Feb 2025 15:01:57 -0600 Message-ID: <20250221210200.244405-8-prsampat@amd.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250221210200.244405-1-prsampat@amd.com> References: <20250221210200.244405-1-prsampat@amd.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B073:EE_|SJ1PR12MB6100:EE_ X-MS-Office365-Filtering-Correlation-Id: 8f489aba-b9b5-4232-e340-08dd52bb3acd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700013|7416014|376014; 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:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(36860700013)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Feb 2025 21:03:45.4630 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8f489aba-b9b5-4232-e340-08dd52bb3acd 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: BN3PEPF0000B073.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ1PR12MB6100 Extend the SEV library to include support for SNP ioctl() wrappers, which aid in launching and interacting with a SEV-SNP guest. Signed-off-by: Pratik R. Sampat --- v6..v7: * Remove FW version macros (Sean) * Define a new type KVM_SEV_PAGE_TYPE_INVALID so that encrypt_region called using the SEV path does not have to pass a literal (Sean) * Replace assert() within snp_vm_init() to TEST_ASSERT_EQ() (Sean) * As SNP currently uses privatization and encryption of a region in tandem, remove privatize_region() and include it's functionality within encrypt_region() by adding a parameter (Sean) * Minor cleanup of code braces (Sean) --- arch/x86/include/uapi/asm/kvm.h | 1 + tools/arch/x86/include/uapi/asm/kvm.h | 1 + tools/testing/selftests/kvm/include/x86/sev.h | 33 ++++++++- tools/testing/selftests/kvm/lib/x86/sev.c | 68 +++++++++++++++++-- 4 files changed, 97 insertions(+), 6 deletions(-) diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h index 9e75da97bce0..565e4d054627 100644 --- a/arch/x86/include/uapi/asm/kvm.h +++ b/arch/x86/include/uapi/asm/kvm.h @@ -841,6 +841,7 @@ struct kvm_sev_snp_launch_start { }; /* Kept in sync with firmware values for simplicity. */ +#define KVM_SEV_PAGE_TYPE_INVALID 0x0 #define KVM_SEV_SNP_PAGE_TYPE_NORMAL 0x1 #define KVM_SEV_SNP_PAGE_TYPE_ZERO 0x3 #define KVM_SEV_SNP_PAGE_TYPE_UNMEASURED 0x4 diff --git a/tools/arch/x86/include/uapi/asm/kvm.h b/tools/arch/x86/include/uapi/asm/kvm.h index 88585c1de416..17e44fbdc2a7 100644 --- a/tools/arch/x86/include/uapi/asm/kvm.h +++ b/tools/arch/x86/include/uapi/asm/kvm.h @@ -841,6 +841,7 @@ struct kvm_sev_snp_launch_start { }; /* Kept in sync with firmware values for simplicity. */ +#define KVM_SEV_PAGE_TYPE_INVALID 0x0 #define KVM_SEV_SNP_PAGE_TYPE_NORMAL 0x1 #define KVM_SEV_SNP_PAGE_TYPE_ZERO 0x3 #define KVM_SEV_SNP_PAGE_TYPE_UNMEASURED 0x4 diff --git a/tools/testing/selftests/kvm/include/x86/sev.h b/tools/testing/selftests/kvm/include/x86/sev.h index b112f7664534..c696d10f9332 100644 --- a/tools/testing/selftests/kvm/include/x86/sev.h +++ b/tools/testing/selftests/kvm/include/x86/sev.h @@ -25,6 +25,10 @@ enum sev_guest_state { #define SEV_POLICY_NO_DBG (1UL << 0) #define SEV_POLICY_ES (1UL << 2) +#define SNP_POLICY_SMT (1ULL << 16) +#define SNP_POLICY_RSVD_MBO (1ULL << 17) +#define SNP_POLICY_DBG (1ULL << 19) + #define GHCB_MSR_TERM_REQ 0x100 bool is_sev_vm(struct kvm_vm *vm); @@ -34,13 +38,26 @@ bool is_sev_snp_vm(struct kvm_vm *vm); void sev_vm_launch(struct kvm_vm *vm, uint32_t policy); void sev_vm_launch_measure(struct kvm_vm *vm, uint8_t *measurement); void sev_vm_launch_finish(struct kvm_vm *vm); +void snp_vm_launch_start(struct kvm_vm *vm, uint64_t policy); +void snp_vm_launch_update(struct kvm_vm *vm); +void snp_vm_launch_finish(struct kvm_vm *vm); struct kvm_vm *vm_sev_create_with_one_vcpu(uint32_t type, void *guest_code, struct kvm_vcpu **cpu); -void vm_sev_launch(struct kvm_vm *vm, uint32_t policy, uint8_t *measurement); +void vm_sev_launch(struct kvm_vm *vm, uint64_t policy, uint8_t *measurement); kvm_static_assert(SEV_RET_SUCCESS == 0); +/* + * A SEV-SNP VM requires the policy reserved bit to always be set. + * The SMT policy bit is also required to be set based on SMT being + * available and active on the system. + */ +static inline u64 snp_default_policy(void) +{ + return SNP_POLICY_RSVD_MBO | (smt_on() ? SNP_POLICY_SMT : 0); +} + /* * The KVM_MEMORY_ENCRYPT_OP uAPI is utter garbage and takes an "unsigned long" * instead of a proper struct. The size of the parameter is embedded in the @@ -74,6 +91,7 @@ kvm_static_assert(SEV_RET_SUCCESS == 0); void sev_vm_init(struct kvm_vm *vm); void sev_es_vm_init(struct kvm_vm *vm); +void snp_vm_init(struct kvm_vm *vm); static inline void vmgexit(void) { @@ -102,4 +120,17 @@ static inline void sev_launch_update_data(struct kvm_vm *vm, vm_paddr_t gpa, vm_sev_ioctl(vm, KVM_SEV_LAUNCH_UPDATE_DATA, &update_data); } +static inline void snp_launch_update_data(struct kvm_vm *vm, vm_paddr_t gpa, + uint64_t hva, uint64_t size, uint8_t type) +{ + struct kvm_sev_snp_launch_update update_data = { + .uaddr = hva, + .gfn_start = gpa >> PAGE_SHIFT, + .len = size, + .type = type, + }; + + vm_sev_ioctl(vm, KVM_SEV_SNP_LAUNCH_UPDATE, &update_data); +} + #endif /* SELFTEST_KVM_SEV_H */ diff --git a/tools/testing/selftests/kvm/lib/x86/sev.c b/tools/testing/selftests/kvm/lib/x86/sev.c index 4587f2b6bc39..a56f5164b0a6 100644 --- a/tools/testing/selftests/kvm/lib/x86/sev.c +++ b/tools/testing/selftests/kvm/lib/x86/sev.c @@ -31,7 +31,8 @@ bool is_sev_vm(struct kvm_vm *vm) * and find the first range, but that's correct because the condition * expression would cause us to quit the loop. */ -static void encrypt_region(struct kvm_vm *vm, struct userspace_mem_region *region) +static void encrypt_region(struct kvm_vm *vm, struct userspace_mem_region *region, + uint8_t page_type, bool private) { const struct sparsebit *protected_phy_pages = region->protected_phy_pages; const vm_paddr_t gpa_base = region->region.guest_phys_addr; @@ -41,13 +42,23 @@ static void encrypt_region(struct kvm_vm *vm, struct userspace_mem_region *regio if (!sparsebit_any_set(protected_phy_pages)) return; - sev_register_encrypted_memory(vm, region); + if (!is_sev_snp_vm(vm)) + sev_register_encrypted_memory(vm, region); sparsebit_for_each_set_range(protected_phy_pages, i, j) { const uint64_t size = (j - i + 1) * vm->page_size; const uint64_t offset = (i - lowest_page_in_region) * vm->page_size; - sev_launch_update_data(vm, gpa_base + offset, size); + if (private) + vm_mem_set_private(vm, gpa_base + offset, size); + + if (is_sev_snp_vm(vm)) + snp_launch_update_data(vm, gpa_base + offset, + (uint64_t)addr_gpa2hva(vm, gpa_base + offset), + size, page_type); + else + sev_launch_update_data(vm, gpa_base + offset, size); + } } @@ -77,6 +88,14 @@ void sev_es_vm_init(struct kvm_vm *vm) } } +void snp_vm_init(struct kvm_vm *vm) +{ + struct kvm_sev_init init = { 0 }; + + TEST_ASSERT_EQ(vm->type, KVM_X86_SNP_VM); + vm_sev_ioctl(vm, KVM_SEV_INIT2, &init); +} + void sev_vm_launch(struct kvm_vm *vm, uint32_t policy) { struct kvm_sev_launch_start launch_start = { @@ -93,7 +112,7 @@ void sev_vm_launch(struct kvm_vm *vm, uint32_t policy) TEST_ASSERT_EQ(status.state, SEV_GUEST_STATE_LAUNCH_UPDATE); hash_for_each(vm->regions.slot_hash, ctr, region, slot_node) - encrypt_region(vm, region); + encrypt_region(vm, region, KVM_SEV_PAGE_TYPE_INVALID, false); if (policy & SEV_POLICY_ES) vm_sev_ioctl(vm, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL); @@ -129,6 +148,33 @@ void sev_vm_launch_finish(struct kvm_vm *vm) TEST_ASSERT_EQ(status.state, SEV_GUEST_STATE_RUNNING); } +void snp_vm_launch_start(struct kvm_vm *vm, uint64_t policy) +{ + struct kvm_sev_snp_launch_start launch_start = { + .policy = policy, + }; + + vm_sev_ioctl(vm, KVM_SEV_SNP_LAUNCH_START, &launch_start); +} + +void snp_vm_launch_update(struct kvm_vm *vm) +{ + struct userspace_mem_region *region; + int ctr; + + hash_for_each(vm->regions.slot_hash, ctr, region, slot_node) + encrypt_region(vm, region, KVM_SEV_SNP_PAGE_TYPE_NORMAL, true); + + vm->arch.is_pt_protected = true; +} + +void snp_vm_launch_finish(struct kvm_vm *vm) +{ + struct kvm_sev_snp_launch_finish launch_finish = { 0 }; + + vm_sev_ioctl(vm, KVM_SEV_SNP_LAUNCH_FINISH, &launch_finish); +} + struct kvm_vm *vm_sev_create_with_one_vcpu(uint32_t type, void *guest_code, struct kvm_vcpu **cpu) { @@ -145,8 +191,20 @@ struct kvm_vm *vm_sev_create_with_one_vcpu(uint32_t type, void *guest_code, return vm; } -void vm_sev_launch(struct kvm_vm *vm, uint32_t policy, uint8_t *measurement) +void vm_sev_launch(struct kvm_vm *vm, uint64_t policy, uint8_t *measurement) { + if (is_sev_snp_vm(vm)) { + vm_enable_cap(vm, KVM_CAP_EXIT_HYPERCALL, (1 << KVM_HC_MAP_GPA_RANGE)); + + snp_vm_launch_start(vm, policy); + + snp_vm_launch_update(vm); + + snp_vm_launch_finish(vm); + + return; + } + sev_vm_launch(vm, policy); if (!measurement)