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 #include "kselftest.h" 25 26 static void guest_code(void) 27 { 28 /* 29 * We embed diag 501 here instead of doing a ucall to avoid that 30 * the compiler has messed with r11 at the time of the ucall. 31 */ 32 asm volatile ( 33 "0: diag 0,0,0x501\n" 34 " ahi 11,1\n" 35 " j 0b\n" 36 ); 37 } 38 39 #define REG_COMPARE(reg) \ 40 TEST_ASSERT(left->reg == right->reg, \ 41 "Register " #reg \ 42 " values did not match: 0x%llx, 0x%llx\n", \ 43 left->reg, right->reg) 44 45 #define REG_COMPARE32(reg) \ 46 TEST_ASSERT(left->reg == right->reg, \ 47 "Register " #reg \ 48 " values did not match: 0x%x, 0x%x\n", \ 49 left->reg, right->reg) 50 51 52 static void compare_regs(struct kvm_regs *left, struct kvm_sync_regs *right) 53 { 54 int i; 55 56 for (i = 0; i < 16; i++) 57 REG_COMPARE(gprs[i]); 58 } 59 60 static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right) 61 { 62 int i; 63 64 for (i = 0; i < 16; i++) 65 REG_COMPARE32(acrs[i]); 66 67 for (i = 0; i < 16; i++) 68 REG_COMPARE(crs[i]); 69 } 70 71 #undef REG_COMPARE 72 73 #define TEST_SYNC_FIELDS (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS|KVM_SYNC_DIAG318) 74 #define INVALID_SYNC_FIELD 0x80000000 75 76 void test_read_invalid(struct kvm_vcpu *vcpu) 77 { 78 struct kvm_run *run = vcpu->run; 79 int rv; 80 81 /* Request reading invalid register set from VCPU. */ 82 run->kvm_valid_regs = INVALID_SYNC_FIELD; 83 rv = _vcpu_run(vcpu); 84 TEST_ASSERT(rv < 0 && errno == EINVAL, 85 "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n", 86 rv); 87 run->kvm_valid_regs = 0; 88 89 run->kvm_valid_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS; 90 rv = _vcpu_run(vcpu); 91 TEST_ASSERT(rv < 0 && errno == EINVAL, 92 "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n", 93 rv); 94 run->kvm_valid_regs = 0; 95 } 96 97 void test_set_invalid(struct kvm_vcpu *vcpu) 98 { 99 struct kvm_run *run = vcpu->run; 100 int rv; 101 102 /* Request setting invalid register set into VCPU. */ 103 run->kvm_dirty_regs = INVALID_SYNC_FIELD; 104 rv = _vcpu_run(vcpu); 105 TEST_ASSERT(rv < 0 && errno == EINVAL, 106 "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n", 107 rv); 108 run->kvm_dirty_regs = 0; 109 110 run->kvm_dirty_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS; 111 rv = _vcpu_run(vcpu); 112 TEST_ASSERT(rv < 0 && errno == EINVAL, 113 "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n", 114 rv); 115 run->kvm_dirty_regs = 0; 116 } 117 118 void test_req_and_verify_all_valid_regs(struct kvm_vcpu *vcpu) 119 { 120 struct kvm_run *run = vcpu->run; 121 struct kvm_sregs sregs; 122 struct kvm_regs regs; 123 int rv; 124 125 /* Request and verify all valid register sets. */ 126 run->kvm_valid_regs = TEST_SYNC_FIELDS; 127 rv = _vcpu_run(vcpu); 128 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv); 129 TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC, 130 "Unexpected exit reason: %u (%s)\n", 131 run->exit_reason, 132 exit_reason_str(run->exit_reason)); 133 TEST_ASSERT(run->s390_sieic.icptcode == 4 && 134 (run->s390_sieic.ipa >> 8) == 0x83 && 135 (run->s390_sieic.ipb >> 16) == 0x501, 136 "Unexpected interception code: ic=%u, ipa=0x%x, ipb=0x%x\n", 137 run->s390_sieic.icptcode, run->s390_sieic.ipa, 138 run->s390_sieic.ipb); 139 140 vcpu_regs_get(vcpu, ®s); 141 compare_regs(®s, &run->s.regs); 142 143 vcpu_sregs_get(vcpu, &sregs); 144 compare_sregs(&sregs, &run->s.regs); 145 } 146 147 void test_set_and_verify_various_reg_values(struct kvm_vcpu *vcpu) 148 { 149 struct kvm_run *run = vcpu->run; 150 struct kvm_sregs sregs; 151 struct kvm_regs regs; 152 int rv; 153 154 /* Set and verify various register values */ 155 run->s.regs.gprs[11] = 0xBAD1DEA; 156 run->s.regs.acrs[0] = 1 << 11; 157 158 run->kvm_valid_regs = TEST_SYNC_FIELDS; 159 run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS; 160 161 if (get_diag318_info() > 0) { 162 run->s.regs.diag318 = get_diag318_info(); 163 run->kvm_dirty_regs |= KVM_SYNC_DIAG318; 164 } 165 166 rv = _vcpu_run(vcpu); 167 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv); 168 TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC, 169 "Unexpected exit reason: %u (%s)\n", 170 run->exit_reason, 171 exit_reason_str(run->exit_reason)); 172 TEST_ASSERT(run->s.regs.gprs[11] == 0xBAD1DEA + 1, 173 "r11 sync regs value incorrect 0x%llx.", 174 run->s.regs.gprs[11]); 175 TEST_ASSERT(run->s.regs.acrs[0] == 1 << 11, 176 "acr0 sync regs value incorrect 0x%x.", 177 run->s.regs.acrs[0]); 178 TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(), 179 "diag318 sync regs value incorrect 0x%llx.", 180 run->s.regs.diag318); 181 182 vcpu_regs_get(vcpu, ®s); 183 compare_regs(®s, &run->s.regs); 184 185 vcpu_sregs_get(vcpu, &sregs); 186 compare_sregs(&sregs, &run->s.regs); 187 } 188 189 void test_clear_kvm_dirty_regs_bits(struct kvm_vcpu *vcpu) 190 { 191 struct kvm_run *run = vcpu->run; 192 int rv; 193 194 /* Clear kvm_dirty_regs bits, verify new s.regs values are 195 * overwritten with existing guest values. 196 */ 197 run->kvm_valid_regs = TEST_SYNC_FIELDS; 198 run->kvm_dirty_regs = 0; 199 run->s.regs.gprs[11] = 0xDEADBEEF; 200 run->s.regs.diag318 = 0x4B1D; 201 rv = _vcpu_run(vcpu); 202 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv); 203 TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC, 204 "Unexpected exit reason: %u (%s)\n", 205 run->exit_reason, 206 exit_reason_str(run->exit_reason)); 207 TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF, 208 "r11 sync regs value incorrect 0x%llx.", 209 run->s.regs.gprs[11]); 210 TEST_ASSERT(run->s.regs.diag318 != 0x4B1D, 211 "diag318 sync regs value incorrect 0x%llx.", 212 run->s.regs.diag318); 213 } 214 215 struct testdef { 216 const char *name; 217 void (*test)(struct kvm_vcpu *vcpu); 218 } testlist[] = { 219 { "read invalid", test_read_invalid }, 220 { "set invalid", test_set_invalid }, 221 { "request+verify all valid regs", test_req_and_verify_all_valid_regs }, 222 { "set+verify various regs", test_set_and_verify_various_reg_values }, 223 { "clear kvm_dirty_regs bits", test_clear_kvm_dirty_regs_bits }, 224 }; 225 226 int main(int argc, char *argv[]) 227 { 228 struct kvm_vcpu *vcpu; 229 struct kvm_vm *vm; 230 int idx; 231 232 TEST_REQUIRE(kvm_has_cap(KVM_CAP_SYNC_REGS)); 233 234 /* Tell stdout not to buffer its content */ 235 setbuf(stdout, NULL); 236 237 ksft_print_header(); 238 239 ksft_set_plan(ARRAY_SIZE(testlist)); 240 241 /* Create VM */ 242 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 243 244 for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) { 245 testlist[idx].test(vcpu); 246 ksft_test_result_pass("%s\n", testlist[idx].name); 247 } 248 249 kvm_vm_free(vm); 250 251 ksft_finished(); /* Print results and exit() accordingly */ 252 } 253