tools/testing/selftests/kvm/aarch64/aarch32_id_regs.c

   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_EL1_EL0), val);
 150         return el0 == ID_AA64PFR0_EL1_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 }