Quelle  hyperv_cpuid.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Test for x86 KVM_CAP_HYPERV_CPUID
 *
 * Copyright (C) 2018, Red Hat, Inc.
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 *
 */
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>

#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "vmx.h"

static void guest_code(void)
{
}

static void test_hv_cpuid(struct kvm_vcpu *vcpu, bool evmcs_expected)
{
 const bool has_irqchip = !vcpu || vcpu->vm->has_irqchip;
 const struct kvm_cpuid2 *hv_cpuid_entries;
 int i;
 int nent_expected = 10;
 u32 test_val;

 if (vcpu)
  hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu);
 else
  hv_cpuid_entries = kvm_get_supported_hv_cpuid();

 TEST_ASSERT(hv_cpuid_entries->nent == nent_expected,
      "KVM_GET_SUPPORTED_HV_CPUID should return %d entries"
      " (returned %d)",
      nent_expected, hv_cpuid_entries->nent);

 for (i = 0; i < hv_cpuid_entries->nent; i++) {
  const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];

  TEST_ASSERT((entry->function >= 0x40000000) &&
       (entry->function <= 0x40000082),
       "function %x is our of supported range",
       entry->function);

  TEST_ASSERT(entry->index == 0,
       ".index field should be zero");

  TEST_ASSERT(entry->flags == 0,
       ".flags field should be zero");

  TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
       !entry->padding[2], "padding should be zero");

  switch (entry->function) {
  case 0x40000000:
   test_val = 0x40000082;

   TEST_ASSERT(entry->eax == test_val,
        "Wrong max leaf report in 0x40000000.EAX: %x"
        " (evmcs=%d)",
        entry->eax, evmcs_expected
    );
   break;
  case 0x40000003:
   TEST_ASSERT(has_irqchip || !(entry->edx & BIT(19)),
        "\"Direct\" Synthetic Timers should require in-kernel APIC");
   break;
  case 0x40000004:
   test_val = entry->eax & (1UL << 18);

   TEST_ASSERT(!!test_val == !is_smt_possible(),
        "NoNonArchitecturalCoreSharing bit"
        " doesn't reflect SMT setting");

   TEST_ASSERT(has_irqchip || !(entry->eax & BIT(10)),
        "Cluster IPI (i.e. SEND_IPI) should require in-kernel APIC");
   break;
  case 0x4000000A:
   TEST_ASSERT(entry->eax & (1UL << 19),
        "Enlightened MSR-Bitmap should always be supported"
        " 0x40000000.EAX: %x", entry->eax);
   if (evmcs_expected)
    TEST_ASSERT((entry->eax & 0xffff) == 0x101,
        "Supported Enlightened VMCS version range is supposed to be 1:1"
        " 0x40000000.EAX: %x", entry->eax);

   break;
  default:
   break;

  }
  /*
 * If needed for debug:
 * fprintf(stdout,
 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n",
 * entry->function, entry->eax, entry->ebx, entry->ecx,
 * entry->edx);
 */
 }

 /*
 * Note, the CPUID array returned by the system-scoped helper is a one-
 * time allocation, i.e. must not be freed.
 */
 if (vcpu)
  free((void *)hv_cpuid_entries);
}

static void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
{
 static struct kvm_cpuid2 cpuid = {.nent = 0};
 int ret;

 if (vcpu)
  ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
 else
  ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);

 TEST_ASSERT(ret == -1 && errno == E2BIG,
      "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when"
      " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno);
}

int main(int argc, char *argv[])
{
 struct kvm_vm *vm;
 struct kvm_vcpu *vcpu;

 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID));

 /* Test the vCPU ioctl without an in-kernel local APIC. */
 vm = vm_create_barebones();
 vcpu = __vm_vcpu_add(vm, 0);
 test_hv_cpuid(vcpu, false);
 kvm_vm_free(vm);

 /* Test vCPU ioctl version */
 vm = vm_create_with_one_vcpu(&vcpu, guest_code);
 test_hv_cpuid_e2big(vm, vcpu);
 test_hv_cpuid(vcpu, false);

 if (!kvm_cpu_has(X86_FEATURE_VMX) ||
     !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
  print_skip("Enlightened VMCS is unsupported");
  goto do_sys;
 }
 vcpu_enable_evmcs(vcpu);
 test_hv_cpuid(vcpu, true);

do_sys:
 /* Test system ioctl version */
 if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID)) {
  print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported");
  goto out;
 }

 test_hv_cpuid_e2big(vm, NULL);
 test_hv_cpuid(NULL, kvm_cpu_has(X86_FEATURE_VMX));

out:
 kvm_vm_free(vm);

 return 0;
}