4 * Copyright (C) 2019, Google LLC.
6 * This work is licensed under the terms of the GNU GPL, version 2.
8 * Test that we don't get a kernel warning when we call KVM_RUN after a
9 * triple fault occurs. To get the triple fault to occur we call KVM_RUN
10 * on a VCPU that hasn't been properly setup.
17 #include <linux/kvm.h>
18 #include <processor.h>
23 #include <sys/ioctl.h>
26 #include <sys/types.h>
28 #include <test_util.h>
34 struct thread_context {
41 struct thread_context *tc = (struct thread_context *)arg;
43 int kvmcpu = tc->kvmcpu;
44 struct kvm_run *run = tc->run;
46 res = ioctl(kvmcpu, KVM_RUN, 0);
47 pr_info("ret1=%d exit_reason=%d suberror=%d\n",
48 res, run->exit_reason, run->internal.suberror);
55 int i, kvm, kvmvm, kvmcpu;
56 pthread_t th[NTHREAD];
58 struct thread_context tc;
60 kvm = open("/dev/kvm", O_RDWR);
61 TEST_ASSERT(kvm != -1, "failed to open /dev/kvm");
62 kvmvm = ioctl(kvm, KVM_CREATE_VM, 0);
63 TEST_ASSERT(kvmvm != -1, "KVM_CREATE_VM failed");
64 kvmcpu = ioctl(kvmvm, KVM_CREATE_VCPU, 0);
65 TEST_ASSERT(kvmcpu != -1, "KVM_CREATE_VCPU failed");
66 run = (struct kvm_run *)mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_SHARED,
71 for (i = 0; i < NTHREAD; i++) {
72 pthread_create(&th[i], NULL, thr, (void *)(uintptr_t)&tc);
73 usleep(rand() % 10000);
75 for (i = 0; i < NTHREAD; i++)
76 pthread_join(th[i], NULL);
79 int get_warnings_count(void)
84 f = popen("dmesg | grep \"WARNING:\" | wc -l", "r");
85 fscanf(f, "%d", &warnings);
93 int warnings_before, warnings_after;
95 if (!is_intel_cpu()) {
96 print_skip("Must be run on an Intel CPU");
100 if (vm_is_unrestricted_guest(NULL)) {
101 print_skip("Unrestricted guest must be disabled");
105 warnings_before = get_warnings_count();
107 for (int i = 0; i < NPROCESS; ++i) {
117 while (waitpid(pid, &status, __WALL) != pid)
121 warnings_after = get_warnings_count();
122 TEST_ASSERT(warnings_before == warnings_after,
123 "Warnings found in kernel. Run 'dmesg' to inspect them.");