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 static void guest_code(void) 24 { 25 } 26 27 static bool smt_possible(void) 28 { 29 char buf[16]; 30 FILE *f; 31 bool res = true; 32 33 f = fopen("/sys/devices/system/cpu/smt/control", "r"); 34 if (f) { 35 if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) { 36 if (!strncmp(buf, "forceoff", 8) || 37 !strncmp(buf, "notsupported", 12)) 38 res = false; 39 } 40 fclose(f); 41 } 42 43 return res; 44 } 45 46 static void test_hv_cpuid(const struct kvm_cpuid2 *hv_cpuid_entries, 47 bool evmcs_expected) 48 { 49 int i; 50 int nent_expected = 10; 51 u32 test_val; 52 53 TEST_ASSERT(hv_cpuid_entries->nent == nent_expected, 54 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries" 55 " (returned %d)", 56 nent_expected, hv_cpuid_entries->nent); 57 58 for (i = 0; i < hv_cpuid_entries->nent; i++) { 59 const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; 60 61 TEST_ASSERT((entry->function >= 0x40000000) && 62 (entry->function <= 0x40000082), 63 "function %x is our of supported range", 64 entry->function); 65 66 TEST_ASSERT(entry->index == 0, 67 ".index field should be zero"); 68 69 TEST_ASSERT(entry->flags == 0, 70 ".flags field should be zero"); 71 72 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && 73 !entry->padding[2], "padding should be zero"); 74 75 switch (entry->function) { 76 case 0x40000000: 77 test_val = 0x40000082; 78 79 TEST_ASSERT(entry->eax == test_val, 80 "Wrong max leaf report in 0x40000000.EAX: %x" 81 " (evmcs=%d)", 82 entry->eax, evmcs_expected 83 ); 84 break; 85 case 0x40000004: 86 test_val = entry->eax & (1UL << 18); 87 88 TEST_ASSERT(!!test_val == !smt_possible(), 89 "NoNonArchitecturalCoreSharing bit" 90 " doesn't reflect SMT setting"); 91 break; 92 case 0x4000000A: 93 TEST_ASSERT(entry->eax & (1UL << 19), 94 "Enlightened MSR-Bitmap should always be supported" 95 " 0x40000000.EAX: %x", entry->eax); 96 if (evmcs_expected) 97 TEST_ASSERT((entry->eax & 0xffff) == 0x101, 98 "Supported Enlightened VMCS version range is supposed to be 1:1" 99 " 0x40000000.EAX: %x", entry->eax); 100 101 break; 102 default: 103 break; 104 105 } 106 /* 107 * If needed for debug: 108 * fprintf(stdout, 109 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", 110 * entry->function, entry->eax, entry->ebx, entry->ecx, 111 * entry->edx); 112 */ 113 } 114 } 115 116 void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu) 117 { 118 static struct kvm_cpuid2 cpuid = {.nent = 0}; 119 int ret; 120 121 if (vcpu) 122 ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 123 else 124 ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 125 126 TEST_ASSERT(ret == -1 && errno == E2BIG, 127 "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" 128 " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno); 129 } 130 131 int main(int argc, char *argv[]) 132 { 133 struct kvm_vm *vm; 134 const struct kvm_cpuid2 *hv_cpuid_entries; 135 struct kvm_vcpu *vcpu; 136 137 /* Tell stdout not to buffer its content */ 138 setbuf(stdout, NULL); 139 140 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID)); 141 142 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 143 144 /* Test vCPU ioctl version */ 145 test_hv_cpuid_e2big(vm, vcpu); 146 147 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu); 148 test_hv_cpuid(hv_cpuid_entries, false); 149 free((void *)hv_cpuid_entries); 150 151 if (!kvm_cpu_has(X86_FEATURE_VMX) || 152 !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { 153 print_skip("Enlightened VMCS is unsupported"); 154 goto do_sys; 155 } 156 vcpu_enable_evmcs(vcpu); 157 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu); 158 test_hv_cpuid(hv_cpuid_entries, true); 159 free((void *)hv_cpuid_entries); 160 161 do_sys: 162 /* Test system ioctl version */ 163 if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID)) { 164 print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported"); 165 goto out; 166 } 167 168 test_hv_cpuid_e2big(vm, NULL); 169 170 hv_cpuid_entries = kvm_get_supported_hv_cpuid(); 171 test_hv_cpuid(hv_cpuid_entries, kvm_cpu_has(X86_FEATURE_VMX)); 172 173 out: 174 kvm_vm_free(vm); 175 176 return 0; 177 } 178