tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c

   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 void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries,
  30                           int evmcs_enabled)
  31 {
  32         int i;
  33
  34         if (!evmcs_enabled)
  35                 TEST_ASSERT(hv_cpuid_entries->nent == 6,
  36                             "KVM_GET_SUPPORTED_HV_CPUID should return 6 entries"
  37                             " when Enlightened VMCS is disabled (returned %d)",
  38                             hv_cpuid_entries->nent);
  39         else
  40                 TEST_ASSERT(hv_cpuid_entries->nent == 7,
  41                             "KVM_GET_SUPPORTED_HV_CPUID should return 7 entries"
  42                             " when Enlightened VMCS is enabled (returned %d)",
  43                             hv_cpuid_entries->nent);
  44
  45         for (i = 0; i < hv_cpuid_entries->nent; i++) {
  46                 struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];
  47
  48                 TEST_ASSERT((entry->function >= 0x40000000) &&
  49                             (entry->function <= 0x4000000A),
  50                             "function %lx is our of supported range",
  51                             entry->function);
  52
  53                 TEST_ASSERT(entry->index == 0,
  54                             ".index field should be zero");
  55
  56                 TEST_ASSERT(entry->flags == 0,
  57                             ".flags field should be zero");
  58
  59                 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
  60                             !entry->padding[2], "padding should be zero");
  61
  62                 /*
  63                  * If needed for debug:
  64                  * fprintf(stdout,
  65                  *      "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n",
  66                  *      entry->function, entry->eax, entry->ebx, entry->ecx,
  67                  *      entry->edx);
  68                  */
  69         }
  70
  71 }
  72
  73 void test_hv_cpuid_e2big(struct kvm_vm *vm)
  74 {
  75         static struct kvm_cpuid2 cpuid = {.nent = 0};
  76         int ret;
  77
  78         ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
  79
  80         TEST_ASSERT(ret == -1 && errno == E2BIG,
  81                     "KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when"
  82                     " it should have: %d %d", ret, errno);
  83 }
  84
  85
  86 struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(struct kvm_vm *vm)
  87 {
  88         int nent = 20; /* should be enough */
  89         static struct kvm_cpuid2 *cpuid;
  90
  91         cpuid = malloc(sizeof(*cpuid) + nent * sizeof(struct kvm_cpuid_entry2));
  92
  93         if (!cpuid) {
  94                 perror("malloc");
  95                 abort();
  96         }
  97
  98         cpuid->nent = nent;
  99
 100         vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
 101
 102         return cpuid;
 103 }
 104
 105
 106 int main(int argc, char *argv[])
 107 {
 108         struct kvm_vm *vm;
 109         int rv;
 110         struct kvm_cpuid2 *hv_cpuid_entries;
 111
 112         /* Tell stdout not to buffer its content */
 113         setbuf(stdout, NULL);
 114
 115         rv = kvm_check_cap(KVM_CAP_HYPERV_CPUID);
 116         if (!rv) {
 117                 fprintf(stderr,
 118                         "KVM_CAP_HYPERV_CPUID not supported, skip test\n");
 119                 exit(KSFT_SKIP);
 120         }
 121
 122         /* Create VM */
 123         vm = vm_create_default(VCPU_ID, 0, guest_code);
 124
 125         test_hv_cpuid_e2big(vm);
 126
 127         hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm);
 128         if (!hv_cpuid_entries)
 129                 return 1;
 130
 131         test_hv_cpuid(hv_cpuid_entries, 0);
 132
 133         free(hv_cpuid_entries);
 134
 135         if (!kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
 136                 fprintf(stderr,
 137                         "Enlightened VMCS is unsupported, skip related test\n");
 138                 goto vm_free;
 139         }
 140
 141         vcpu_enable_evmcs(vm, VCPU_ID);
 142
 143         hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm);
 144         if (!hv_cpuid_entries)
 145                 return 1;
 146
 147         test_hv_cpuid(hv_cpuid_entries, 1);
 148
 149         free(hv_cpuid_entries);
 150
 151 vm_free:
 152         kvm_vm_free(vm);
 153
 154         return 0;
 155 }