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 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 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 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 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