1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * aarch32_id_regs - Test for ID register behavior on AArch64-only systems
4  *
5  * Copyright (c) 2022 Google LLC.
6  *
7  * Test that KVM handles the AArch64 views of the AArch32 ID registers as RAZ
8  * and WI from userspace.
9  */
10 
11 #include <stdint.h>
12 
13 #include "kvm_util.h"
14 #include "processor.h"
15 #include "test_util.h"
16 #include <linux/bitfield.h>
17 
18 #define BAD_ID_REG_VAL	0x1badc0deul
19 
20 #define GUEST_ASSERT_REG_RAZ(reg)	GUEST_ASSERT_EQ(read_sysreg_s(reg), 0)
21 
22 static void guest_main(void)
23 {
24 	GUEST_ASSERT_REG_RAZ(SYS_ID_PFR0_EL1);
25 	GUEST_ASSERT_REG_RAZ(SYS_ID_PFR1_EL1);
26 	GUEST_ASSERT_REG_RAZ(SYS_ID_DFR0_EL1);
27 	GUEST_ASSERT_REG_RAZ(SYS_ID_AFR0_EL1);
28 	GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR0_EL1);
29 	GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR1_EL1);
30 	GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR2_EL1);
31 	GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR3_EL1);
32 	GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR0_EL1);
33 	GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR1_EL1);
34 	GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR2_EL1);
35 	GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR3_EL1);
36 	GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR4_EL1);
37 	GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR5_EL1);
38 	GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR4_EL1);
39 	GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR6_EL1);
40 	GUEST_ASSERT_REG_RAZ(SYS_MVFR0_EL1);
41 	GUEST_ASSERT_REG_RAZ(SYS_MVFR1_EL1);
42 	GUEST_ASSERT_REG_RAZ(SYS_MVFR2_EL1);
43 	GUEST_ASSERT_REG_RAZ(sys_reg(3, 0, 0, 3, 3));
44 	GUEST_ASSERT_REG_RAZ(SYS_ID_PFR2_EL1);
45 	GUEST_ASSERT_REG_RAZ(SYS_ID_DFR1_EL1);
46 	GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR5_EL1);
47 	GUEST_ASSERT_REG_RAZ(sys_reg(3, 0, 0, 3, 7));
48 
49 	GUEST_DONE();
50 }
51 
52 static void test_guest_raz(struct kvm_vcpu *vcpu)
53 {
54 	struct ucall uc;
55 
56 	vcpu_run(vcpu);
57 
58 	switch (get_ucall(vcpu, &uc)) {
59 	case UCALL_ABORT:
60 		REPORT_GUEST_ASSERT(uc);
61 		break;
62 	case UCALL_DONE:
63 		break;
64 	default:
65 		TEST_FAIL("Unexpected ucall: %lu", uc.cmd);
66 	}
67 }
68 
69 static uint64_t raz_wi_reg_ids[] = {
70 	KVM_ARM64_SYS_REG(SYS_ID_PFR0_EL1),
71 	KVM_ARM64_SYS_REG(SYS_ID_PFR1_EL1),
72 	KVM_ARM64_SYS_REG(SYS_ID_DFR0_EL1),
73 	KVM_ARM64_SYS_REG(SYS_ID_MMFR0_EL1),
74 	KVM_ARM64_SYS_REG(SYS_ID_MMFR1_EL1),
75 	KVM_ARM64_SYS_REG(SYS_ID_MMFR2_EL1),
76 	KVM_ARM64_SYS_REG(SYS_ID_MMFR3_EL1),
77 	KVM_ARM64_SYS_REG(SYS_ID_ISAR0_EL1),
78 	KVM_ARM64_SYS_REG(SYS_ID_ISAR1_EL1),
79 	KVM_ARM64_SYS_REG(SYS_ID_ISAR2_EL1),
80 	KVM_ARM64_SYS_REG(SYS_ID_ISAR3_EL1),
81 	KVM_ARM64_SYS_REG(SYS_ID_ISAR4_EL1),
82 	KVM_ARM64_SYS_REG(SYS_ID_ISAR5_EL1),
83 	KVM_ARM64_SYS_REG(SYS_ID_MMFR4_EL1),
84 	KVM_ARM64_SYS_REG(SYS_ID_ISAR6_EL1),
85 	KVM_ARM64_SYS_REG(SYS_MVFR0_EL1),
86 	KVM_ARM64_SYS_REG(SYS_MVFR1_EL1),
87 	KVM_ARM64_SYS_REG(SYS_MVFR2_EL1),
88 	KVM_ARM64_SYS_REG(SYS_ID_PFR2_EL1),
89 	KVM_ARM64_SYS_REG(SYS_ID_MMFR5_EL1),
90 };
91 
92 static void test_user_raz_wi(struct kvm_vcpu *vcpu)
93 {
94 	int i;
95 
96 	for (i = 0; i < ARRAY_SIZE(raz_wi_reg_ids); i++) {
97 		uint64_t reg_id = raz_wi_reg_ids[i];
98 		uint64_t val;
99 
100 		vcpu_get_reg(vcpu, reg_id, &val);
101 		TEST_ASSERT_EQ(val, 0);
102 
103 		/*
104 		 * Expect the ioctl to succeed with no effect on the register
105 		 * value.
106 		 */
107 		vcpu_set_reg(vcpu, reg_id, BAD_ID_REG_VAL);
108 
109 		vcpu_get_reg(vcpu, reg_id, &val);
110 		TEST_ASSERT_EQ(val, 0);
111 	}
112 }
113 
114 static uint64_t raz_invariant_reg_ids[] = {
115 	KVM_ARM64_SYS_REG(SYS_ID_AFR0_EL1),
116 	KVM_ARM64_SYS_REG(sys_reg(3, 0, 0, 3, 3)),
117 	KVM_ARM64_SYS_REG(SYS_ID_DFR1_EL1),
118 	KVM_ARM64_SYS_REG(sys_reg(3, 0, 0, 3, 7)),
119 };
120 
121 static void test_user_raz_invariant(struct kvm_vcpu *vcpu)
122 {
123 	int i, r;
124 
125 	for (i = 0; i < ARRAY_SIZE(raz_invariant_reg_ids); i++) {
126 		uint64_t reg_id = raz_invariant_reg_ids[i];
127 		uint64_t val;
128 
129 		vcpu_get_reg(vcpu, reg_id, &val);
130 		TEST_ASSERT_EQ(val, 0);
131 
132 		r = __vcpu_set_reg(vcpu, reg_id, BAD_ID_REG_VAL);
133 		TEST_ASSERT(r < 0 && errno == EINVAL,
134 			    "unexpected KVM_SET_ONE_REG error: r=%d, errno=%d", r, errno);
135 
136 		vcpu_get_reg(vcpu, reg_id, &val);
137 		TEST_ASSERT_EQ(val, 0);
138 	}
139 }
140 
141 
142 
143 static bool vcpu_aarch64_only(struct kvm_vcpu *vcpu)
144 {
145 	uint64_t val, el0;
146 
147 	vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_ID_AA64PFR0_EL1), &val);
148 
149 	el0 = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL0), val);
150 	return el0 == ID_AA64PFR0_ELx_64BIT_ONLY;
151 }
152 
153 int main(void)
154 {
155 	struct kvm_vcpu *vcpu;
156 	struct kvm_vm *vm;
157 
158 	vm = vm_create_with_one_vcpu(&vcpu, guest_main);
159 
160 	TEST_REQUIRE(vcpu_aarch64_only(vcpu));
161 
162 	test_user_raz_wi(vcpu);
163 	test_user_raz_invariant(vcpu);
164 	test_guest_raz(vcpu);
165 
166 	kvm_vm_free(vm);
167 }
168