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->index == 0, 56 ".index field should be zero"); 57 58 TEST_ASSERT(entry->flags == 0, 59 ".flags field should be zero"); 60 61 TEST_ASSERT(entry->padding[0] == entry->padding[1] 62 == entry->padding[2] == 0, 63 ".index field should be zero"); 64 65 /* 66 * If needed for debug: 67 * fprintf(stdout, 68 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", 69 * entry->function, entry->eax, entry->ebx, entry->ecx, 70 * entry->edx); 71 */ 72 } 73 74 } 75 76 void test_hv_cpuid_e2big(struct kvm_vm *vm) 77 { 78 static struct kvm_cpuid2 cpuid = {.nent = 0}; 79 int ret; 80 81 ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 82 83 TEST_ASSERT(ret == -1 && errno == E2BIG, 84 "KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" 85 " it should have: %d %d", ret, errno); 86 } 87 88 89 struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(struct kvm_vm *vm) 90 { 91 int nent = 20; /* should be enough */ 92 static struct kvm_cpuid2 *cpuid; 93 int ret; 94 95 cpuid = malloc(sizeof(*cpuid) + nent * sizeof(struct kvm_cpuid_entry2)); 96 97 if (!cpuid) { 98 perror("malloc"); 99 abort(); 100 } 101 102 cpuid->nent = nent; 103 104 vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, cpuid); 105 106 return cpuid; 107 } 108 109 110 int main(int argc, char *argv[]) 111 { 112 struct kvm_vm *vm; 113 int rv; 114 uint16_t evmcs_ver; 115 struct kvm_cpuid2 *hv_cpuid_entries; 116 struct kvm_enable_cap enable_evmcs_cap = { 117 .cap = KVM_CAP_HYPERV_ENLIGHTENED_VMCS, 118 .args[0] = (unsigned long)&evmcs_ver 119 }; 120 121 /* Tell stdout not to buffer its content */ 122 setbuf(stdout, NULL); 123 124 rv = kvm_check_cap(KVM_CAP_HYPERV_CPUID); 125 if (!rv) { 126 fprintf(stderr, 127 "KVM_CAP_HYPERV_CPUID not supported, skip test\n"); 128 exit(KSFT_SKIP); 129 } 130 131 /* Create VM */ 132 vm = vm_create_default(VCPU_ID, 0, guest_code); 133 134 test_hv_cpuid_e2big(vm); 135 136 hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); 137 if (!hv_cpuid_entries) 138 return 1; 139 140 test_hv_cpuid(hv_cpuid_entries, 0); 141 142 free(hv_cpuid_entries); 143 144 vcpu_ioctl(vm, VCPU_ID, KVM_ENABLE_CAP, &enable_evmcs_cap); 145 146 hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); 147 if (!hv_cpuid_entries) 148 return 1; 149 150 test_hv_cpuid(hv_cpuid_entries, 1); 151 152 free(hv_cpuid_entries); 153 154 kvm_vm_free(vm); 155 156 return 0; 157 } 158