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 void test_hv_cpuid(struct kvm_vcpu *vcpu, bool evmcs_expected) 26 { 27 const bool has_irqchip = !vcpu || vcpu->vm->has_irqchip; 28 const struct kvm_cpuid2 *hv_cpuid_entries; 29 int i; 30 int nent_expected = 10; 31 u32 test_val; 32 33 if (vcpu) 34 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu); 35 else 36 hv_cpuid_entries = kvm_get_supported_hv_cpuid(); 37 38 TEST_ASSERT(hv_cpuid_entries->nent == nent_expected, 39 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries" 40 " (returned %d)", 41 nent_expected, hv_cpuid_entries->nent); 42 43 for (i = 0; i < hv_cpuid_entries->nent; i++) { 44 const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; 45 46 TEST_ASSERT((entry->function >= 0x40000000) && 47 (entry->function <= 0x40000082), 48 "function %x is our of supported range", 49 entry->function); 50 51 TEST_ASSERT(entry->index == 0, 52 ".index field should be zero"); 53 54 TEST_ASSERT(entry->flags == 0, 55 ".flags field should be zero"); 56 57 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && 58 !entry->padding[2], "padding should be zero"); 59 60 switch (entry->function) { 61 case 0x40000000: 62 test_val = 0x40000082; 63 64 TEST_ASSERT(entry->eax == test_val, 65 "Wrong max leaf report in 0x40000000.EAX: %x" 66 " (evmcs=%d)", 67 entry->eax, evmcs_expected 68 ); 69 break; 70 case 0x40000003: 71 TEST_ASSERT(has_irqchip || !(entry->edx & BIT(19)), 72 "\"Direct\" Synthetic Timers should require in-kernel APIC"); 73 break; 74 case 0x40000004: 75 test_val = entry->eax & (1UL << 18); 76 77 TEST_ASSERT(!!test_val == !is_smt_possible(), 78 "NoNonArchitecturalCoreSharing bit" 79 " doesn't reflect SMT setting"); 80 81 TEST_ASSERT(has_irqchip || !(entry->eax & BIT(10)), 82 "Cluster IPI (i.e. SEND_IPI) should require in-kernel APIC"); 83 break; 84 case 0x4000000A: 85 TEST_ASSERT(entry->eax & (1UL << 19), 86 "Enlightened MSR-Bitmap should always be supported" 87 " 0x40000000.EAX: %x", entry->eax); 88 if (evmcs_expected) 89 TEST_ASSERT((entry->eax & 0xffff) == 0x101, 90 "Supported Enlightened VMCS version range is supposed to be 1:1" 91 " 0x40000000.EAX: %x", entry->eax); 92 93 break; 94 default: 95 break; 96 97 } 98 /* 99 * If needed for debug: 100 * fprintf(stdout, 101 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", 102 * entry->function, entry->eax, entry->ebx, entry->ecx, 103 * entry->edx); 104 */ 105 } 106 107 /* 108 * Note, the CPUID array returned by the system-scoped helper is a one- 109 * time allocation, i.e. must not be freed. 110 */ 111 if (vcpu) 112 free((void *)hv_cpuid_entries); 113 } 114 115 static void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu) 116 { 117 static struct kvm_cpuid2 cpuid = {.nent = 0}; 118 int ret; 119 120 if (vcpu) 121 ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 122 else 123 ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); 124 125 TEST_ASSERT(ret == -1 && errno == E2BIG, 126 "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" 127 " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno); 128 } 129 130 int main(int argc, char *argv[]) 131 { 132 struct kvm_vm *vm; 133 struct kvm_vcpu *vcpu; 134 135 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID)); 136 137 /* Test the vCPU ioctl without an in-kernel local APIC. */ 138 vm = vm_create_barebones(); 139 vcpu = __vm_vcpu_add(vm, 0); 140 test_hv_cpuid(vcpu, false); 141 kvm_vm_free(vm); 142 143 /* Test vCPU ioctl version */ 144 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 145 test_hv_cpuid_e2big(vm, vcpu); 146 test_hv_cpuid(vcpu, false); 147 148 if (!kvm_cpu_has(X86_FEATURE_VMX) || 149 !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { 150 print_skip("Enlightened VMCS is unsupported"); 151 goto do_sys; 152 } 153 vcpu_enable_evmcs(vcpu); 154 test_hv_cpuid(vcpu, true); 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 test_hv_cpuid(NULL, kvm_cpu_has(X86_FEATURE_VMX)); 165 166 out: 167 kvm_vm_free(vm); 168 169 return 0; 170 } 171