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
20static 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
30static 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
42const struct vm_shape protected_vm_shape = {
43	.mode = VM_MODE_DEFAULT,
44	.type = KVM_X86_SW_PROTECTED_VM,
45};
46
47static 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
85static 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
114int 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