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 #include <fcntl.h> 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <sys/ioctl.h> 15 16 #include "test_util.h" 17 #include "kvm_util.h" 18 #include "processor.h" 19 #include "vmx.h" 20 21 static void guest_code(void) 22 { 23 } 24 25 static bool smt_possible(void) 26 { 27 char buf[16]; 28 FILE *f; 29 bool res = true; 30 31 f = fopen("/sys/devices/system/cpu/smt/control", "r"); 32 if (f) { 33 if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) { 34 if (!strncmp(buf, "forceoff", 8) || 35 !strncmp(buf, "notsupported", 12)) 36 res = false; 37 } 38 fclose(f); 39 } 40 41 return res; 42 } 43 44 static void test_hv_cpuid(const struct kvm_cpuid2 *hv_cpuid_entries, 45 bool evmcs_expected) 46 { 47 int i; 48 int nent_expected = 10; 49 u32 test_val; 50 51 TEST_ASSERT(hv_cpuid_entries->nent == nent_expected, 52 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries" 53 " (returned %d)", 54 nent_expected, hv_cpuid_entries->nent); 55 56 for (i = 0; i < hv_cpuid_entries->nent; i++) { 57 const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; 58 59 TEST_ASSERT((entry->function >= 0x40000000) && 60 (entry->function <= 0x40000082), 61 "function %x is our of supported range", 62 entry->function); 63 64 TEST_ASSERT(entry->index == 0, 65 ".index field should be zero"); 66 67 TEST_ASSERT(entry->flags == 0, 68 ".flags field should be zero"); 69 70 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && 71 !entry->padding[2], "padding should be zero"); 72 73 switch (entry->function) { 74 case 0x40000000: 75 test_val = 0x40000082; 76 77 TEST_ASSERT(entry->eax == test_val, 78 "Wrong max leaf report in 0x40000000.EAX: %x" 79 " (evmcs=%d)", 80 entry->eax, evmcs_expected 81 ); 82 break; 83 case 0x40000004: 84 test_val = entry->eax & (1UL << 18); 85 86 TEST_ASSERT(!!test_val == !smt_possible(), 87 "NoNonArchitecturalCoreSharing bit" 88 " doesn't reflect SMT setting"); 89 break; 90 case 0x4000000A: 91 TEST_ASSERT(entry->eax & (1UL << 19), 92 "Enlightened MSR-Bitmap should always be supported" 93 " 0x40000000.EAX: %x", entry->eax); 94 if (evmcs_expected) 95 TEST_ASSERT((entry->eax & 0xffff) == 0x101, 96 "Supported Enlightened VMCS version range is supposed to be 1:1" 97 " 0x40000000.EAX: %x", entry->eax); 98 99 break; 100 default: 101 break; 102 103 } 104 /* 105 * If needed for debug: 106 * fprintf(stdout, 107 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", 108 * entry->function, entry->eax, entry->ebx, entry->ecx, 109 * entry->edx); 110 */ 111 } 112 } 113 114 void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu) 115 { 116 static struct kvm_cpuid2 cpuid = {.nent = 0}; 117 int ret; 118 119 if (vcpu) 120 ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 121 else 122 ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 123 124 TEST_ASSERT(ret == -1 && errno == E2BIG, 125 "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" 126 " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno); 127 } 128 129 int main(int argc, char *argv[]) 130 { 131 struct kvm_vm *vm; 132 const struct kvm_cpuid2 *hv_cpuid_entries; 133 struct kvm_vcpu *vcpu; 134 135 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID)); 136 137 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 138 139 /* Test vCPU ioctl version */ 140 test_hv_cpuid_e2big(vm, vcpu); 141 142 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu); 143 test_hv_cpuid(hv_cpuid_entries, false); 144 free((void *)hv_cpuid_entries); 145 146 if (!kvm_cpu_has(X86_FEATURE_VMX) || 147 !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { 148 print_skip("Enlightened VMCS is unsupported"); 149 goto do_sys; 150 } 151 vcpu_enable_evmcs(vcpu); 152 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu); 153 test_hv_cpuid(hv_cpuid_entries, true); 154 free((void *)hv_cpuid_entries); 155 156 do_sys: 157 /* Test system ioctl version */ 158 if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID)) { 159 print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported"); 160 goto out; 161 } 162 163 test_hv_cpuid_e2big(vm, NULL); 164 165 hv_cpuid_entries = kvm_get_supported_hv_cpuid(); 166 test_hv_cpuid(hv_cpuid_entries, kvm_cpu_has(X86_FEATURE_VMX)); 167 168 out: 169 kvm_vm_free(vm); 170 171 return 0; 172 } 173