LXR linux/tools/testing/selftests/kvm/x86_64/hyperv

   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
  25static void guest_code(void)
  26{
  27}
  28
  29static 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
  73void 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
  86struct 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
 106int 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
 151vm_free:
 152        kvm_vm_free(vm);
 153
 154        return 0;
 155}
 156