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_expected) 50 { 51 int i; 52 int nent_expected = 10; 53 u32 test_val; 54 55 TEST_ASSERT(hv_cpuid_entries->nent == nent_expected, 56 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries" 57 " (returned %d)", 58 nent_expected, hv_cpuid_entries->nent); 59 60 for (i = 0; i < hv_cpuid_entries->nent; i++) { 61 struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; 62 63 TEST_ASSERT((entry->function >= 0x40000000) && 64 (entry->function <= 0x40000082), 65 "function %x is our of supported range", 66 entry->function); 67 68 TEST_ASSERT(entry->index == 0, 69 ".index field should be zero"); 70 71 TEST_ASSERT(entry->flags == 0, 72 ".flags field should be zero"); 73 74 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && 75 !entry->padding[2], "padding should be zero"); 76 77 switch (entry->function) { 78 case 0x40000000: 79 test_val = 0x40000082; 80 81 TEST_ASSERT(entry->eax == test_val, 82 "Wrong max leaf report in 0x40000000.EAX: %x" 83 " (evmcs=%d)", 84 entry->eax, evmcs_expected 85 ); 86 break; 87 case 0x40000004: 88 test_val = entry->eax & (1UL << 18); 89 90 TEST_ASSERT(!!test_val == !smt_possible(), 91 "NoNonArchitecturalCoreSharing bit" 92 " doesn't reflect SMT setting"); 93 break; 94 case 0x4000000A: 95 TEST_ASSERT(entry->eax & (1UL << 19), 96 "Enlightened MSR-Bitmap should always be supported" 97 " 0x40000000.EAX: %x", entry->eax); 98 if (evmcs_expected) 99 TEST_ASSERT((entry->eax & 0xffff) == 0x101, 100 "Supported Enlightened VMCS version range is supposed to be 1:1" 101 " 0x40000000.EAX: %x", entry->eax); 102 103 break; 104 default: 105 break; 106 107 } 108 /* 109 * If needed for debug: 110 * fprintf(stdout, 111 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", 112 * entry->function, entry->eax, entry->ebx, entry->ecx, 113 * entry->edx); 114 */ 115 } 116 } 117 118 void test_hv_cpuid_e2big(struct kvm_vm *vm, bool system) 119 { 120 static struct kvm_cpuid2 cpuid = {.nent = 0}; 121 int ret; 122 123 if (!system) 124 ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 125 else 126 ret = _kvm_ioctl(vm, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 127 128 TEST_ASSERT(ret == -1 && errno == E2BIG, 129 "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" 130 " it should have: %d %d", system ? "KVM" : "vCPU", ret, errno); 131 } 132 133 int main(int argc, char *argv[]) 134 { 135 struct kvm_vm *vm; 136 struct kvm_cpuid2 *hv_cpuid_entries; 137 138 /* Tell stdout not to buffer its content */ 139 setbuf(stdout, NULL); 140 141 if (!kvm_check_cap(KVM_CAP_HYPERV_CPUID)) { 142 print_skip("KVM_CAP_HYPERV_CPUID not supported"); 143 exit(KSFT_SKIP); 144 } 145 146 vm = vm_create_default(VCPU_ID, 0, guest_code); 147 148 /* Test vCPU ioctl version */ 149 test_hv_cpuid_e2big(vm, false); 150 151 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vm, VCPU_ID); 152 test_hv_cpuid(hv_cpuid_entries, false); 153 free(hv_cpuid_entries); 154 155 if (!nested_vmx_supported() || 156 !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { 157 print_skip("Enlightened VMCS is unsupported"); 158 goto do_sys; 159 } 160 vcpu_enable_evmcs(vm, VCPU_ID); 161 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vm, VCPU_ID); 162 test_hv_cpuid(hv_cpuid_entries, true); 163 free(hv_cpuid_entries); 164 165 do_sys: 166 /* Test system ioctl version */ 167 if (!kvm_check_cap(KVM_CAP_SYS_HYPERV_CPUID)) { 168 print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported"); 169 goto out; 170 } 171 172 test_hv_cpuid_e2big(vm, true); 173 174 hv_cpuid_entries = kvm_get_supported_hv_cpuid(); 175 test_hv_cpuid(hv_cpuid_entries, nested_vmx_supported()); 176 177 out: 178 kvm_vm_free(vm); 179 180 return 0; 181 } 182