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(struct kvm_vcpu *vcpu, bool evmcs_expected) 45 { 46 const bool has_irqchip = !vcpu || vcpu->vm->has_irqchip; 47 const struct kvm_cpuid2 *hv_cpuid_entries; 48 int i; 49 int nent_expected = 10; 50 u32 test_val; 51 52 if (vcpu) 53 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu); 54 else 55 hv_cpuid_entries = kvm_get_supported_hv_cpuid(); 56 57 TEST_ASSERT(hv_cpuid_entries->nent == nent_expected, 58 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries" 59 " (returned %d)", 60 nent_expected, hv_cpuid_entries->nent); 61 62 for (i = 0; i < hv_cpuid_entries->nent; i++) { 63 const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; 64 65 TEST_ASSERT((entry->function >= 0x40000000) && 66 (entry->function <= 0x40000082), 67 "function %x is our of supported range", 68 entry->function); 69 70 TEST_ASSERT(entry->index == 0, 71 ".index field should be zero"); 72 73 TEST_ASSERT(entry->flags == 0, 74 ".flags field should be zero"); 75 76 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && 77 !entry->padding[2], "padding should be zero"); 78 79 switch (entry->function) { 80 case 0x40000000: 81 test_val = 0x40000082; 82 83 TEST_ASSERT(entry->eax == test_val, 84 "Wrong max leaf report in 0x40000000.EAX: %x" 85 " (evmcs=%d)", 86 entry->eax, evmcs_expected 87 ); 88 break; 89 case 0x40000003: 90 TEST_ASSERT(has_irqchip || !(entry->edx & BIT(19)), 91 "\"Direct\" Synthetic Timers should require in-kernel APIC"); 92 break; 93 case 0x40000004: 94 test_val = entry->eax & (1UL << 18); 95 96 TEST_ASSERT(!!test_val == !smt_possible(), 97 "NoNonArchitecturalCoreSharing bit" 98 " doesn't reflect SMT setting"); 99 100 TEST_ASSERT(has_irqchip || !(entry->eax & BIT(10)), 101 "Cluster IPI (i.e. SEND_IPI) should require in-kernel APIC"); 102 break; 103 case 0x4000000A: 104 TEST_ASSERT(entry->eax & (1UL << 19), 105 "Enlightened MSR-Bitmap should always be supported" 106 " 0x40000000.EAX: %x", entry->eax); 107 if (evmcs_expected) 108 TEST_ASSERT((entry->eax & 0xffff) == 0x101, 109 "Supported Enlightened VMCS version range is supposed to be 1:1" 110 " 0x40000000.EAX: %x", entry->eax); 111 112 break; 113 default: 114 break; 115 116 } 117 /* 118 * If needed for debug: 119 * fprintf(stdout, 120 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", 121 * entry->function, entry->eax, entry->ebx, entry->ecx, 122 * entry->edx); 123 */ 124 } 125 126 /* 127 * Note, the CPUID array returned by the system-scoped helper is a one- 128 * time allocation, i.e. must not be freed. 129 */ 130 if (vcpu) 131 free((void *)hv_cpuid_entries); 132 } 133 134 static void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu) 135 { 136 static struct kvm_cpuid2 cpuid = {.nent = 0}; 137 int ret; 138 139 if (vcpu) 140 ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 141 else 142 ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 143 144 TEST_ASSERT(ret == -1 && errno == E2BIG, 145 "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" 146 " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno); 147 } 148 149 int main(int argc, char *argv[]) 150 { 151 struct kvm_vm *vm; 152 struct kvm_vcpu *vcpu; 153 154 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID)); 155 156 /* Test the vCPU ioctl without an in-kernel local APIC. */ 157 vm = vm_create_barebones(); 158 vcpu = __vm_vcpu_add(vm, 0); 159 test_hv_cpuid(vcpu, false); 160 kvm_vm_free(vm); 161 162 /* Test vCPU ioctl version */ 163 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 164 test_hv_cpuid_e2big(vm, vcpu); 165 test_hv_cpuid(vcpu, false); 166 167 if (!kvm_cpu_has(X86_FEATURE_VMX) || 168 !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { 169 print_skip("Enlightened VMCS is unsupported"); 170 goto do_sys; 171 } 172 vcpu_enable_evmcs(vcpu); 173 test_hv_cpuid(vcpu, true); 174 175 do_sys: 176 /* Test system ioctl version */ 177 if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID)) { 178 print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported"); 179 goto out; 180 } 181 182 test_hv_cpuid_e2big(vm, NULL); 183 test_hv_cpuid(NULL, kvm_cpu_has(X86_FEATURE_VMX)); 184 185 out: 186 kvm_vm_free(vm); 187 188 return 0; 189 } 190