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 uint64_t guest_repeatedly_read(void)
21 {
22 volatile uint64_t value;
23
24 while (true)
25 value = *((uint64_t *) EXITS_TEST_GVA);
26
27 return value;
28 }
29
30 static uint32_t 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 uint32_t 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 pthread_create(&vm_thread, NULL,
69 (void *(*)(void *))run_vcpu_get_exit_reason,
70 (void *)vcpu);
71
72 vm_mem_region_delete(vm, EXITS_TEST_SLOT);
73
74 pthread_join(vm_thread, &thread_return);
75 exit_reason = (uint32_t)(uint64_t)thread_return;
76
77 TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MEMORY_FAULT);
78 TEST_ASSERT_EQ(vcpu->run->memory_fault.flags, KVM_MEMORY_EXIT_FLAG_PRIVATE);
79 TEST_ASSERT_EQ(vcpu->run->memory_fault.gpa, EXITS_TEST_GPA);
80 TEST_ASSERT_EQ(vcpu->run->memory_fault.size, EXITS_TEST_SIZE);
81
82 kvm_vm_free(vm);
83 }
84
85 static void test_private_access_memslot_not_private(void)
86 {
87 struct kvm_vm *vm;
88 struct kvm_vcpu *vcpu;
89 uint32_t exit_reason;
90
91 vm = vm_create_shape_with_one_vcpu(protected_vm_shape, &vcpu,
92 guest_repeatedly_read);
93
94 /* Add a non-private memslot (flags = 0) */
95 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
96 EXITS_TEST_GPA, EXITS_TEST_SLOT,
97 EXITS_TEST_NPAGES, 0);
98
99 virt_map(vm, EXITS_TEST_GVA, EXITS_TEST_GPA, EXITS_TEST_NPAGES);
100
101 /* Request to access page privately */
102 vm_mem_set_private(vm, EXITS_TEST_GPA, EXITS_TEST_SIZE);
103
104 exit_reason = run_vcpu_get_exit_reason(vcpu);
105
106 TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MEMORY_FAULT);
107 TEST_ASSERT_EQ(vcpu->run->memory_fault.flags, KVM_MEMORY_EXIT_FLAG_PRIVATE);
108 TEST_ASSERT_EQ(vcpu->run->memory_fault.gpa, EXITS_TEST_GPA);
109 TEST_ASSERT_EQ(vcpu->run->memory_fault.size, EXITS_TEST_SIZE);
110
111 kvm_vm_free(vm);
112 }
113
114 int main(int argc, char *argv[])
115 {
116 TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM));
117
118 test_private_access_memslot_deleted();
119 test_private_access_memslot_not_private();
120 }
121
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