1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Test for x86 KVM_CAP_HYPERV_CPUID 4 * 5 * Copyright (C) 2018, Red Hat, Inc. 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2. 8 * 9 */ 10 11 #define _GNU_SOURCE /* for program_invocation_short_name */ 12 #include <fcntl.h> 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <string.h> 16 #include <sys/ioctl.h> 17 18 #include "test_util.h" 19 #include "kvm_util.h" 20 #include "processor.h" 21 #include "vmx.h" 22 23 #define VCPU_ID 0 24 25 static void guest_code(void) 26 { 27 } 28 29 static bool smt_possible(void) 30 { 31 char buf[16]; 32 FILE *f; 33 bool res = true; 34 35 f = fopen("/sys/devices/system/cpu/smt/control", "r"); 36 if (f) { 37 if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) { 38 if (!strncmp(buf, "forceoff", 8) || 39 !strncmp(buf, "notsupported", 12)) 40 res = false; 41 } 42 fclose(f); 43 } 44 45 return res; 46 } 47 48 static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries, 49 bool evmcs_enabled) 50 { 51 int i; 52 int nent = 9; 53 u32 test_val; 54 55 if (evmcs_enabled) 56 nent += 1; /* 0x4000000A */ 57 58 TEST_ASSERT(hv_cpuid_entries->nent == nent, 59 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries" 60 " with evmcs=%d (returned %d)", 61 nent, evmcs_enabled, hv_cpuid_entries->nent); 62 63 for (i = 0; i < hv_cpuid_entries->nent; i++) { 64 struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; 65 66 TEST_ASSERT((entry->function >= 0x40000000) && 67 (entry->function <= 0x40000082), 68 "function %x is our of supported range", 69 entry->function); 70 71 TEST_ASSERT(evmcs_enabled || (entry->function != 0x4000000A), 72 "0x4000000A leaf should not be reported"); 73 74 TEST_ASSERT(entry->index == 0, 75 ".index field should be zero"); 76 77 TEST_ASSERT(entry->flags == 0, 78 ".flags field should be zero"); 79 80 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && 81 !entry->padding[2], "padding should be zero"); 82 83 switch (entry->function) { 84 case 0x40000000: 85 test_val = 0x40000082; 86 87 TEST_ASSERT(entry->eax == test_val, 88 "Wrong max leaf report in 0x40000000.EAX: %x" 89 " (evmcs=%d)", 90 entry->eax, evmcs_enabled 91 ); 92 break; 93 case 0x40000004: 94 test_val = entry->eax & (1UL << 18); 95 96 TEST_ASSERT(!!test_val == !smt_possible(), 97 "NoNonArchitecturalCoreSharing bit" 98 " doesn't reflect SMT setting"); 99 break; 100 } 101 102 /* 103 * If needed for debug: 104 * fprintf(stdout, 105 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", 106 * entry->function, entry->eax, entry->ebx, entry->ecx, 107 * entry->edx); 108 */ 109 } 110 111 } 112 113 void test_hv_cpuid_e2big(struct kvm_vm *vm) 114 { 115 static struct kvm_cpuid2 cpuid = {.nent = 0}; 116 int ret; 117 118 ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 119 120 TEST_ASSERT(ret == -1 && errno == E2BIG, 121 "KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" 122 " it should have: %d %d", ret, errno); 123 } 124 125 126 struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(struct kvm_vm *vm) 127 { 128 int nent = 20; /* should be enough */ 129 static struct kvm_cpuid2 *cpuid; 130 131 cpuid = malloc(sizeof(*cpuid) + nent * sizeof(struct kvm_cpuid_entry2)); 132 133 if (!cpuid) { 134 perror("malloc"); 135 abort(); 136 } 137 138 cpuid->nent = nent; 139 140 vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, cpuid); 141 142 return cpuid; 143 } 144 145 146 int main(int argc, char *argv[]) 147 { 148 struct kvm_vm *vm; 149 int rv, stage; 150 struct kvm_cpuid2 *hv_cpuid_entries; 151 bool evmcs_enabled; 152 153 /* Tell stdout not to buffer its content */ 154 setbuf(stdout, NULL); 155 156 rv = kvm_check_cap(KVM_CAP_HYPERV_CPUID); 157 if (!rv) { 158 print_skip("KVM_CAP_HYPERV_CPUID not supported"); 159 exit(KSFT_SKIP); 160 } 161 162 for (stage = 0; stage < 3; stage++) { 163 evmcs_enabled = false; 164 165 vm = vm_create_default(VCPU_ID, 0, guest_code); 166 switch (stage) { 167 case 0: 168 test_hv_cpuid_e2big(vm); 169 continue; 170 case 1: 171 break; 172 case 2: 173 if (!nested_vmx_supported() || 174 !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { 175 print_skip("Enlightened VMCS is unsupported"); 176 continue; 177 } 178 vcpu_enable_evmcs(vm, VCPU_ID); 179 evmcs_enabled = true; 180 break; 181 } 182 183 hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); 184 test_hv_cpuid(hv_cpuid_entries, evmcs_enabled); 185 free(hv_cpuid_entries); 186 kvm_vm_free(vm); 187 } 188 189 return 0; 190 } 191