1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Test for s390x KVM_CAP_SYNC_REGS 4 * 5 * Based on the same test for x86: 6 * Copyright (C) 2018, Google LLC. 7 * 8 * Adaptions for s390x: 9 * Copyright (C) 2019, Red Hat, Inc. 10 * 11 * Test expected behavior of the KVM_CAP_SYNC_REGS functionality. 12 */ 13 14 #define _GNU_SOURCE /* for program_invocation_short_name */ 15 #include <fcntl.h> 16 #include <stdio.h> 17 #include <stdlib.h> 18 #include <string.h> 19 #include <sys/ioctl.h> 20 21 #include "test_util.h" 22 #include "kvm_util.h" 23 #include "diag318_test_handler.h" 24 25 #define VCPU_ID 5 26 27 static void guest_code(void) 28 { 29 /* 30 * We embed diag 501 here instead of doing a ucall to avoid that 31 * the compiler has messed with r11 at the time of the ucall. 32 */ 33 asm volatile ( 34 "0: diag 0,0,0x501\n" 35 " ahi 11,1\n" 36 " j 0b\n" 37 ); 38 } 39 40 #define REG_COMPARE(reg) \ 41 TEST_ASSERT(left->reg == right->reg, \ 42 "Register " #reg \ 43 " values did not match: 0x%llx, 0x%llx\n", \ 44 left->reg, right->reg) 45 46 #define REG_COMPARE32(reg) \ 47 TEST_ASSERT(left->reg == right->reg, \ 48 "Register " #reg \ 49 " values did not match: 0x%x, 0x%x\n", \ 50 left->reg, right->reg) 51 52 53 static void compare_regs(struct kvm_regs *left, struct kvm_sync_regs *right) 54 { 55 int i; 56 57 for (i = 0; i < 16; i++) 58 REG_COMPARE(gprs[i]); 59 } 60 61 static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right) 62 { 63 int i; 64 65 for (i = 0; i < 16; i++) 66 REG_COMPARE32(acrs[i]); 67 68 for (i = 0; i < 16; i++) 69 REG_COMPARE(crs[i]); 70 } 71 72 #undef REG_COMPARE 73 74 #define TEST_SYNC_FIELDS (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS|KVM_SYNC_DIAG318) 75 #define INVALID_SYNC_FIELD 0x80000000 76 77 int main(int argc, char *argv[]) 78 { 79 struct kvm_vm *vm; 80 struct kvm_run *run; 81 struct kvm_regs regs; 82 struct kvm_sregs sregs; 83 int rv, cap; 84 85 /* Tell stdout not to buffer its content */ 86 setbuf(stdout, NULL); 87 88 cap = kvm_check_cap(KVM_CAP_SYNC_REGS); 89 if (!cap) { 90 print_skip("CAP_SYNC_REGS not supported"); 91 exit(KSFT_SKIP); 92 } 93 94 /* Create VM */ 95 vm = vm_create_default(VCPU_ID, 0, guest_code); 96 97 run = vcpu_state(vm, VCPU_ID); 98 99 /* Request reading invalid register set from VCPU. */ 100 run->kvm_valid_regs = INVALID_SYNC_FIELD; 101 rv = _vcpu_run(vm, VCPU_ID); 102 TEST_ASSERT(rv < 0 && errno == EINVAL, 103 "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n", 104 rv); 105 vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0; 106 107 run->kvm_valid_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS; 108 rv = _vcpu_run(vm, VCPU_ID); 109 TEST_ASSERT(rv < 0 && errno == EINVAL, 110 "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n", 111 rv); 112 vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0; 113 114 /* Request setting invalid register set into VCPU. */ 115 run->kvm_dirty_regs = INVALID_SYNC_FIELD; 116 rv = _vcpu_run(vm, VCPU_ID); 117 TEST_ASSERT(rv < 0 && errno == EINVAL, 118 "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n", 119 rv); 120 vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0; 121 122 run->kvm_dirty_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS; 123 rv = _vcpu_run(vm, VCPU_ID); 124 TEST_ASSERT(rv < 0 && errno == EINVAL, 125 "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n", 126 rv); 127 vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0; 128 129 /* Request and verify all valid register sets. */ 130 run->kvm_valid_regs = TEST_SYNC_FIELDS; 131 rv = _vcpu_run(vm, VCPU_ID); 132 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv); 133 TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC, 134 "Unexpected exit reason: %u (%s)\n", 135 run->exit_reason, 136 exit_reason_str(run->exit_reason)); 137 TEST_ASSERT(run->s390_sieic.icptcode == 4 && 138 (run->s390_sieic.ipa >> 8) == 0x83 && 139 (run->s390_sieic.ipb >> 16) == 0x501, 140 "Unexpected interception code: ic=%u, ipa=0x%x, ipb=0x%x\n", 141 run->s390_sieic.icptcode, run->s390_sieic.ipa, 142 run->s390_sieic.ipb); 143 144 vcpu_regs_get(vm, VCPU_ID, ®s); 145 compare_regs(®s, &run->s.regs); 146 147 vcpu_sregs_get(vm, VCPU_ID, &sregs); 148 compare_sregs(&sregs, &run->s.regs); 149 150 /* Set and verify various register values */ 151 run->s.regs.gprs[11] = 0xBAD1DEA; 152 run->s.regs.acrs[0] = 1 << 11; 153 154 run->kvm_valid_regs = TEST_SYNC_FIELDS; 155 run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS; 156 157 if (get_diag318_info() > 0) { 158 run->s.regs.diag318 = get_diag318_info(); 159 run->kvm_dirty_regs |= KVM_SYNC_DIAG318; 160 } 161 162 rv = _vcpu_run(vm, VCPU_ID); 163 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv); 164 TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC, 165 "Unexpected exit reason: %u (%s)\n", 166 run->exit_reason, 167 exit_reason_str(run->exit_reason)); 168 TEST_ASSERT(run->s.regs.gprs[11] == 0xBAD1DEA + 1, 169 "r11 sync regs value incorrect 0x%llx.", 170 run->s.regs.gprs[11]); 171 TEST_ASSERT(run->s.regs.acrs[0] == 1 << 11, 172 "acr0 sync regs value incorrect 0x%x.", 173 run->s.regs.acrs[0]); 174 TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(), 175 "diag318 sync regs value incorrect 0x%llx.", 176 run->s.regs.diag318); 177 178 vcpu_regs_get(vm, VCPU_ID, ®s); 179 compare_regs(®s, &run->s.regs); 180 181 vcpu_sregs_get(vm, VCPU_ID, &sregs); 182 compare_sregs(&sregs, &run->s.regs); 183 184 /* Clear kvm_dirty_regs bits, verify new s.regs values are 185 * overwritten with existing guest values. 186 */ 187 run->kvm_valid_regs = TEST_SYNC_FIELDS; 188 run->kvm_dirty_regs = 0; 189 run->s.regs.gprs[11] = 0xDEADBEEF; 190 run->s.regs.diag318 = 0x4B1D; 191 rv = _vcpu_run(vm, VCPU_ID); 192 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv); 193 TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC, 194 "Unexpected exit reason: %u (%s)\n", 195 run->exit_reason, 196 exit_reason_str(run->exit_reason)); 197 TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF, 198 "r11 sync regs value incorrect 0x%llx.", 199 run->s.regs.gprs[11]); 200 TEST_ASSERT(run->s.regs.diag318 != 0x4B1D, 201 "diag318 sync regs value incorrect 0x%llx.", 202 run->s.regs.diag318); 203 204 kvm_vm_free(vm); 205 206 return 0; 207 } 208