tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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, 0, 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}