1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2023, Google LLC. 4 */ 5 #include <linux/kvm.h> 6 #include <pthread.h> 7 #include <stdint.h> 8 9 #include "kvm_util.h" 10 #include "processor.h" 11 #include "test_util.h" 12 13 /* Arbitrarily selected to avoid overlaps with anything else */ 14 #define EXITS_TEST_GVA 0xc0000000 15 #define EXITS_TEST_GPA EXITS_TEST_GVA 16 #define EXITS_TEST_NPAGES 1 17 #define EXITS_TEST_SIZE (EXITS_TEST_NPAGES * PAGE_SIZE) 18 #define EXITS_TEST_SLOT 10 19 20 static u64 guest_repeatedly_read(void) 21 { 22 volatile u64 value; 23 24 while (true) 25 value = *((u64 *)EXITS_TEST_GVA); 26 27 return value; 28 } 29 30 static u32 run_vcpu_get_exit_reason(struct kvm_vcpu *vcpu) 31 { 32 int r; 33 34 r = _vcpu_run(vcpu); 35 if (r) { 36 TEST_ASSERT(errno == EFAULT, KVM_IOCTL_ERROR(KVM_RUN, r)); 37 TEST_ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_MEMORY_FAULT); 38 } 39 return vcpu->run->exit_reason; 40 } 41 42 const struct vm_shape protected_vm_shape = { 43 .mode = VM_MODE_DEFAULT, 44 .type = KVM_X86_SW_PROTECTED_VM, 45 }; 46 47 static void test_private_access_memslot_deleted(void) 48 { 49 struct kvm_vm *vm; 50 struct kvm_vcpu *vcpu; 51 pthread_t vm_thread; 52 void *thread_return; 53 u32 exit_reason; 54 55 vm = vm_create_shape_with_one_vcpu(protected_vm_shape, &vcpu, 56 guest_repeatedly_read); 57 58 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 59 EXITS_TEST_GPA, EXITS_TEST_SLOT, 60 EXITS_TEST_NPAGES, 61 KVM_MEM_GUEST_MEMFD); 62 63 virt_map(vm, EXITS_TEST_GVA, EXITS_TEST_GPA, EXITS_TEST_NPAGES); 64 65 /* Request to access page privately */ 66 vm_mem_set_private(vm, EXITS_TEST_GPA, EXITS_TEST_SIZE); 67 68 kvm_pthread_create(&vm_thread, NULL, 69 (pthread_fn_t)run_vcpu_get_exit_reason, (void *)vcpu); 70 71 vm_mem_region_delete(vm, EXITS_TEST_SLOT); 72 73 kvm_pthread_join(vm_thread, &thread_return); 74 exit_reason = (u32)(u64)thread_return; 75 76 TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MEMORY_FAULT); 77 TEST_ASSERT_EQ(vcpu->run->memory_fault.flags, KVM_MEMORY_EXIT_FLAG_PRIVATE); 78 TEST_ASSERT_EQ(vcpu->run->memory_fault.gpa, EXITS_TEST_GPA); 79 TEST_ASSERT_EQ(vcpu->run->memory_fault.size, EXITS_TEST_SIZE); 80 81 kvm_vm_free(vm); 82 } 83 84 static void test_private_access_memslot_not_private(void) 85 { 86 struct kvm_vm *vm; 87 struct kvm_vcpu *vcpu; 88 u32 exit_reason; 89 90 vm = vm_create_shape_with_one_vcpu(protected_vm_shape, &vcpu, 91 guest_repeatedly_read); 92 93 /* Add a non-private memslot (flags = 0) */ 94 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 95 EXITS_TEST_GPA, EXITS_TEST_SLOT, 96 EXITS_TEST_NPAGES, 0); 97 98 virt_map(vm, EXITS_TEST_GVA, EXITS_TEST_GPA, EXITS_TEST_NPAGES); 99 100 /* Request to access page privately */ 101 vm_mem_set_private(vm, EXITS_TEST_GPA, EXITS_TEST_SIZE); 102 103 exit_reason = run_vcpu_get_exit_reason(vcpu); 104 105 TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MEMORY_FAULT); 106 TEST_ASSERT_EQ(vcpu->run->memory_fault.flags, KVM_MEMORY_EXIT_FLAG_PRIVATE); 107 TEST_ASSERT_EQ(vcpu->run->memory_fault.gpa, EXITS_TEST_GPA); 108 TEST_ASSERT_EQ(vcpu->run->memory_fault.size, EXITS_TEST_SIZE); 109 110 kvm_vm_free(vm); 111 } 112 113 int main(int argc, char *argv[]) 114 { 115 TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM)); 116 117 test_private_access_memslot_deleted(); 118 test_private_access_memslot_not_private(); 119 } 120