LXR linux/tools/testing/selftests/kvm/set_sregs

   1/*
   2 * KVM_SET_SREGS tests
   3 *
   4 * Copyright (C) 2018, Google LLC.
   5 *
   6 * This work is licensed under the terms of the GNU GPL, version 2.
   7 *
   8 * This is a regression test for the bug fixed by the following commit:
   9 * d3802286fa0f ("kvm: x86: Disallow illegal IA32_APIC_BASE MSR values")
  10 *
  11 * That bug allowed a user-mode program that called the KVM_SET_SREGS
  12 * ioctl to put a VCPU's local APIC into an invalid state.
  13 *
  14 */
  15#define _GNU_SOURCE /* for program_invocation_short_name */
  16#include <fcntl.h>
  17#include <stdio.h>
  18#include <stdlib.h>
  19#include <string.h>
  20#include <sys/ioctl.h>
  21
  22#include "test_util.h"
  23
  24#include "kvm_util.h"
  25#include "x86.h"
  26
  27#define VCPU_ID                  5
  28
  29int main(int argc, char *argv[])
  30{
  31        struct kvm_sregs sregs;
  32        struct kvm_vm *vm;
  33        int rc;
  34
  35        /* Tell stdout not to buffer its content */
  36        setbuf(stdout, NULL);
  37
  38        /* Create VM */
  39        vm = vm_create_default(VCPU_ID, NULL);
  40
  41        vcpu_sregs_get(vm, VCPU_ID, &sregs);
  42        sregs.apic_base = 1 << 10;
  43        rc = _vcpu_sregs_set(vm, VCPU_ID, &sregs);
  44        TEST_ASSERT(rc, "Set IA32_APIC_BASE to %llx (invalid)",
  45                    sregs.apic_base);
  46        sregs.apic_base = 1 << 11;
  47        rc = _vcpu_sregs_set(vm, VCPU_ID, &sregs);
  48        TEST_ASSERT(!rc, "Couldn't set IA32_APIC_BASE to %llx (valid)",
  49                    sregs.apic_base);
  50
  51        kvm_vm_free(vm);
  52
  53        return 0;
  54}
  55