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", \ 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", \ 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", 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", 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", 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", 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", rv); 129 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC); 130 TEST_ASSERT(run->s390_sieic.icptcode == 4 && 131 (run->s390_sieic.ipa >> 8) == 0x83 && 132 (run->s390_sieic.ipb >> 16) == 0x501, 133 "Unexpected interception code: ic=%u, ipa=0x%x, ipb=0x%x", 134 run->s390_sieic.icptcode, run->s390_sieic.ipa, 135 run->s390_sieic.ipb); 136 137 vcpu_regs_get(vcpu, ®s); 138 compare_regs(®s, &run->s.regs); 139 140 vcpu_sregs_get(vcpu, &sregs); 141 compare_sregs(&sregs, &run->s.regs); 142 } 143 144 void test_set_and_verify_various_reg_values(struct kvm_vcpu *vcpu) 145 { 146 struct kvm_run *run = vcpu->run; 147 struct kvm_sregs sregs; 148 struct kvm_regs regs; 149 int rv; 150 151 /* Set and verify various register values */ 152 run->s.regs.gprs[11] = 0xBAD1DEA; 153 run->s.regs.acrs[0] = 1 << 11; 154 155 run->kvm_valid_regs = TEST_SYNC_FIELDS; 156 run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS; 157 158 if (get_diag318_info() > 0) { 159 run->s.regs.diag318 = get_diag318_info(); 160 run->kvm_dirty_regs |= KVM_SYNC_DIAG318; 161 } 162 163 rv = _vcpu_run(vcpu); 164 TEST_ASSERT(rv == 0, "vcpu_run failed: %d", rv); 165 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC); 166 TEST_ASSERT(run->s.regs.gprs[11] == 0xBAD1DEA + 1, 167 "r11 sync regs value incorrect 0x%llx.", 168 run->s.regs.gprs[11]); 169 TEST_ASSERT(run->s.regs.acrs[0] == 1 << 11, 170 "acr0 sync regs value incorrect 0x%x.", 171 run->s.regs.acrs[0]); 172 TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(), 173 "diag318 sync regs value incorrect 0x%llx.", 174 run->s.regs.diag318); 175 176 vcpu_regs_get(vcpu, ®s); 177 compare_regs(®s, &run->s.regs); 178 179 vcpu_sregs_get(vcpu, &sregs); 180 compare_sregs(&sregs, &run->s.regs); 181 } 182 183 void test_clear_kvm_dirty_regs_bits(struct kvm_vcpu *vcpu) 184 { 185 struct kvm_run *run = vcpu->run; 186 int rv; 187 188 /* Clear kvm_dirty_regs bits, verify new s.regs values are 189 * overwritten with existing guest values. 190 */ 191 run->kvm_valid_regs = TEST_SYNC_FIELDS; 192 run->kvm_dirty_regs = 0; 193 run->s.regs.gprs[11] = 0xDEADBEEF; 194 run->s.regs.diag318 = 0x4B1D; 195 rv = _vcpu_run(vcpu); 196 TEST_ASSERT(rv == 0, "vcpu_run failed: %d", rv); 197 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC); 198 TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF, 199 "r11 sync regs value incorrect 0x%llx.", 200 run->s.regs.gprs[11]); 201 TEST_ASSERT(run->s.regs.diag318 != 0x4B1D, 202 "diag318 sync regs value incorrect 0x%llx.", 203 run->s.regs.diag318); 204 } 205 206 struct testdef { 207 const char *name; 208 void (*test)(struct kvm_vcpu *vcpu); 209 } testlist[] = { 210 { "read invalid", test_read_invalid }, 211 { "set invalid", test_set_invalid }, 212 { "request+verify all valid regs", test_req_and_verify_all_valid_regs }, 213 { "set+verify various regs", test_set_and_verify_various_reg_values }, 214 { "clear kvm_dirty_regs bits", test_clear_kvm_dirty_regs_bits }, 215 }; 216 217 int main(int argc, char *argv[]) 218 { 219 struct kvm_vcpu *vcpu; 220 struct kvm_vm *vm; 221 int idx; 222 223 TEST_REQUIRE(kvm_has_cap(KVM_CAP_SYNC_REGS)); 224 225 ksft_print_header(); 226 227 ksft_set_plan(ARRAY_SIZE(testlist)); 228 229 /* Create VM */ 230 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 231 232 for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) { 233 testlist[idx].test(vcpu); 234 ksft_test_result_pass("%s\n", testlist[idx].name); 235 } 236 237 kvm_vm_free(vm); 238 239 ksft_finished(); /* Print results and exit() accordingly */ 240 } 241