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2024 12:32:32 +0000 Date: Fri, 1 Mar 2024 20:02:43 +0800 From: Yan Zhao To: Sagi Shahar CC: , Ackerley Tng , Ryan Afranji , Erdem Aktas , Isaku Yamahata , Sean Christopherson , Paolo Bonzini , Shuah Khan , Peter Gonda , Haibo Xu , Chao Peng , "Vishal Annapurve" , Roger Wang , "Vipin Sharma" , , , , , Subject: Re: [RFC PATCH v5 23/29] KVM: selftests: TDX: Add shared memory test Message-ID: Reply-To: Yan Zhao References: <20231212204647.2170650-1-sagis@google.com> <20231212204647.2170650-24-sagis@google.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20231212204647.2170650-24-sagis@google.com> X-ClientProxiedBy: SI2PR02CA0028.apcprd02.prod.outlook.com (2603:1096:4:195::8) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB5966:EE_|BN9PR11MB5289:EE_ X-MS-Office365-Filtering-Correlation-Id: a829d69e-a6b0-452e-ec85-08dc39ebaa92 X-LD-Processed: 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49EZK44WGEwfmJhnaUJFoubVB9a+psAGGLwM9OODgTDwDHKz9kG9W4xXooBOmn5351llyDAhS+qYxH+sW/fHLeJftTMT+TN49NJKJ7cNKTTypJPD6q6Mq6AQZyGfE6qe8GZYByKQ7pgV5jBQVLACFsgIAUr8gnnnKcN4bIr7B4jxgH6GkFWhCpO20w5DLarfYbjw6FHS9PLiamB7DPHHIMsNypnKLShBjoqHl17jxPW3+RFChxK+RAEC+VHOIMEP9pOhN3Dysb/67EWhw1jSKmX4C6bC0B1k95oNfiSj8F1hFP4ymC3rr/gQVNqoPvniEjkkTGB+/2OYcXh5x7L501aDogT1+OiV+s1CPOkBVLvexbbVpa88v3SwL3C+mh9umrWWg X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > +void guest_shared_mem(void) > +{ > + uint32_t *test_mem_shared_gva = > + (uint32_t *)TDX_SHARED_MEM_TEST_SHARED_GVA; > + > + uint64_t placeholder; > + uint64_t ret; > + > + /* Map gpa as shared */ > + ret = tdg_vp_vmcall_map_gpa(test_mem_shared_gpa, PAGE_SIZE, > + &placeholder); > + if (ret) > + tdx_test_fatal_with_data(ret, __LINE__); > + > + *test_mem_shared_gva = TDX_SHARED_MEM_TEST_GUEST_WRITE_VALUE; > + > + /* Exit so host can read shared value */ > + ret = tdg_vp_vmcall_instruction_io(TDX_SHARED_MEM_TEST_INFO_PORT, 4, > + TDG_VP_VMCALL_INSTRUCTION_IO_WRITE, > + &placeholder); > + if (ret) > + tdx_test_fatal_with_data(ret, __LINE__); > + > + /* Read value written by host and send it back out for verification */ > + ret = tdg_vp_vmcall_instruction_io(TDX_SHARED_MEM_TEST_INFO_PORT, 4, > + TDG_VP_VMCALL_INSTRUCTION_IO_WRITE, > + (uint64_t *)test_mem_shared_gva); > + if (ret) > + tdx_test_fatal_with_data(ret, __LINE__); > +} > + > +int verify_shared_mem(void) > +{ > + struct kvm_vm *vm; > + struct kvm_vcpu *vcpu; > + > + vm_vaddr_t test_mem_private_gva; > + uint32_t *test_mem_hva; > + > + vm = td_create(); > + td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0); > + vcpu = td_vcpu_add(vm, 0, guest_shared_mem); > + > + /* > + * Set up shared memory page for testing by first allocating as private > + * and then mapping the same GPA again as shared. This way, the TD does > + * not have to remap its page tables at runtime. > + */ > + test_mem_private_gva = vm_vaddr_alloc(vm, vm->page_size, > + TDX_SHARED_MEM_TEST_PRIVATE_GVA); > + TEST_ASSERT_EQ(test_mem_private_gva, TDX_SHARED_MEM_TEST_PRIVATE_GVA); > + > + test_mem_hva = addr_gva2hva(vm, test_mem_private_gva); > + TEST_ASSERT(test_mem_hva != NULL, > + "Guest address not found in guest memory regions\n"); > + > + test_mem_private_gpa = addr_gva2gpa(vm, test_mem_private_gva); > + virt_pg_map_shared(vm, TDX_SHARED_MEM_TEST_SHARED_GVA, > + test_mem_private_gpa); > + > + test_mem_shared_gpa = test_mem_private_gpa | BIT_ULL(vm->pa_bits - 1); > + sync_global_to_guest(vm, test_mem_private_gpa); > + sync_global_to_guest(vm, test_mem_shared_gpa); > + > + td_finalize(vm); > + > + printf("Verifying shared memory accesses for TDX\n"); > + > + /* Begin guest execution; guest writes to shared memory. */ > + printf("\t ... Starting guest execution\n"); > + > + /* Handle map gpa as shared */ > + td_vcpu_run(vcpu); > + TDX_TEST_CHECK_GUEST_FAILURE(vcpu); The first VMExit should be caused by tdvmcall map gpa, so it's impossible to be guest failure. Move this line TDX_TEST_CHECK_GUEST_FAILURE(vcpu) to after the next td_vcpu_run() is better. > + > + td_vcpu_run(vcpu); > + TDX_TEST_ASSERT_IO(vcpu, TDX_SHARED_MEM_TEST_INFO_PORT, 4, > + TDG_VP_VMCALL_INSTRUCTION_IO_WRITE); > + TEST_ASSERT_EQ(*test_mem_hva, TDX_SHARED_MEM_TEST_GUEST_WRITE_VALUE); > + > + *test_mem_hva = TDX_SHARED_MEM_TEST_HOST_WRITE_VALUE; > + td_vcpu_run(vcpu); > + TDX_TEST_ASSERT_IO(vcpu, TDX_SHARED_MEM_TEST_INFO_PORT, 4, > + TDG_VP_VMCALL_INSTRUCTION_IO_WRITE); > + TEST_ASSERT_EQ( > + *(uint32_t *)((void *)vcpu->run + vcpu->run->io.data_offset), > + TDX_SHARED_MEM_TEST_HOST_WRITE_VALUE); > + > + printf("\t ... PASSED\n"); > + > + kvm_vm_free(vm); > + > + return 0; > +}