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 22 #define VCPU_ID 0 23 24 static void guest_code(void) 25 { 26 } 27 28 static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries, 29 int evmcs_enabled) 30 { 31 int i; 32 33 if (!evmcs_enabled) 34 TEST_ASSERT(hv_cpuid_entries->nent == 6, 35 "KVM_GET_SUPPORTED_HV_CPUID should return 6 entries" 36 " when Enlightened VMCS is disabled (returned %d)", 37 hv_cpuid_entries->nent); 38 else 39 TEST_ASSERT(hv_cpuid_entries->nent == 7, 40 "KVM_GET_SUPPORTED_HV_CPUID should return 7 entries" 41 " when Enlightened VMCS is enabled (returned %d)", 42 hv_cpuid_entries->nent); 43 44 for (i = 0; i < hv_cpuid_entries->nent; i++) { 45 struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; 46 47 TEST_ASSERT((entry->function >= 0x40000000) && 48 (entry->function <= 0x4000000A), 49 "function %lx is our of supported range", 50 entry->function); 51 52 TEST_ASSERT(entry->index == 0, 53 ".index field should be zero"); 54 55 TEST_ASSERT(entry->flags == 0, 56 ".flags field should be zero"); 57 58 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && 59 !entry->padding[2], "padding should be zero"); 60 61 /* 62 * If needed for debug: 63 * fprintf(stdout, 64 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", 65 * entry->function, entry->eax, entry->ebx, entry->ecx, 66 * entry->edx); 67 */ 68 } 69 70 } 71 72 void test_hv_cpuid_e2big(struct kvm_vm *vm) 73 { 74 static struct kvm_cpuid2 cpuid = {.nent = 0}; 75 int ret; 76 77 ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 78 79 TEST_ASSERT(ret == -1 && errno == E2BIG, 80 "KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" 81 " it should have: %d %d", ret, errno); 82 } 83 84 85 struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(struct kvm_vm *vm) 86 { 87 int nent = 20; /* should be enough */ 88 static struct kvm_cpuid2 *cpuid; 89 90 cpuid = malloc(sizeof(*cpuid) + nent * sizeof(struct kvm_cpuid_entry2)); 91 92 if (!cpuid) { 93 perror("malloc"); 94 abort(); 95 } 96 97 cpuid->nent = nent; 98 99 vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, cpuid); 100 101 return cpuid; 102 } 103 104 105 int main(int argc, char *argv[]) 106 { 107 struct kvm_vm *vm; 108 int rv; 109 uint16_t evmcs_ver; 110 struct kvm_cpuid2 *hv_cpuid_entries; 111 struct kvm_enable_cap enable_evmcs_cap = { 112 .cap = KVM_CAP_HYPERV_ENLIGHTENED_VMCS, 113 .args[0] = (unsigned long)&evmcs_ver 114 }; 115 116 /* Tell stdout not to buffer its content */ 117 setbuf(stdout, NULL); 118 119 rv = kvm_check_cap(KVM_CAP_HYPERV_CPUID); 120 if (!rv) { 121 fprintf(stderr, 122 "KVM_CAP_HYPERV_CPUID not supported, skip test\n"); 123 exit(KSFT_SKIP); 124 } 125 126 /* Create VM */ 127 vm = vm_create_default(VCPU_ID, 0, guest_code); 128 129 test_hv_cpuid_e2big(vm); 130 131 hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); 132 if (!hv_cpuid_entries) 133 return 1; 134 135 test_hv_cpuid(hv_cpuid_entries, 0); 136 137 free(hv_cpuid_entries); 138 139 rv = _vcpu_ioctl(vm, VCPU_ID, KVM_ENABLE_CAP, &enable_evmcs_cap); 140 141 if (rv) { 142 fprintf(stderr, 143 "Enlightened VMCS is unsupported, skip related test\n"); 144 goto vm_free; 145 } 146 147 hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); 148 if (!hv_cpuid_entries) 149 return 1; 150 151 test_hv_cpuid(hv_cpuid_entries, 1); 152 153 free(hv_cpuid_entries); 154 155 vm_free: 156 kvm_vm_free(vm); 157 158 return 0; 159 } 160