/*
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* mmio_warning_test
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*
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* Copyright (C) 2019, Google LLC.
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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*
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* Test that we don't get a kernel warning when we call KVM_RUN after a
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* triple fault occurs. To get the triple fault to occur we call KVM_RUN
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* on a VCPU that hasn't been properly setup.
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*
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*/
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#define _GNU_SOURCE
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#include <fcntl.h>
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#include <kvm_util.h>
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#include <linux/kvm.h>
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#include <processor.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <test_util.h>
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#include <unistd.h>
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#define NTHREAD 4
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#define NPROCESS 5
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struct thread_context {
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int kvmcpu;
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struct kvm_run *run;
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};
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void *thr(void *arg)
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{
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struct thread_context *tc = (struct thread_context *)arg;
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int res;
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int kvmcpu = tc->kvmcpu;
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struct kvm_run *run = tc->run;
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res = ioctl(kvmcpu, KVM_RUN, 0);
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pr_info("ret1=%d exit_reason=%d suberror=%d\n",
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res, run->exit_reason, run->internal.suberror);
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return 0;
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}
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void test(void)
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{
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int i, kvm, kvmvm, kvmcpu;
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pthread_t th[NTHREAD];
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struct kvm_run *run;
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struct thread_context tc;
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kvm = open("/dev/kvm", O_RDWR);
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TEST_ASSERT(kvm != -1, "failed to open /dev/kvm");
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kvmvm = ioctl(kvm, KVM_CREATE_VM, 0);
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TEST_ASSERT(kvmvm != -1, "KVM_CREATE_VM failed");
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kvmcpu = ioctl(kvmvm, KVM_CREATE_VCPU, 0);
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TEST_ASSERT(kvmcpu != -1, "KVM_CREATE_VCPU failed");
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run = (struct kvm_run *)mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_SHARED,
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kvmcpu, 0);
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tc.kvmcpu = kvmcpu;
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tc.run = run;
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srand(getpid());
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for (i = 0; i < NTHREAD; i++) {
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pthread_create(&th[i], NULL, thr, (void *)(uintptr_t)&tc);
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usleep(rand() % 10000);
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}
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for (i = 0; i < NTHREAD; i++)
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pthread_join(th[i], NULL);
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}
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int get_warnings_count(void)
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{
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int warnings;
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FILE *f;
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f = popen("dmesg | grep \"WARNING:\" | wc -l", "r");
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if (fscanf(f, "%d", &warnings) < 1)
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warnings = 0;
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pclose(f);
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return warnings;
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}
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int main(void)
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{
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int warnings_before, warnings_after;
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if (!is_intel_cpu()) {
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print_skip("Must be run on an Intel CPU");
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exit(KSFT_SKIP);
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}
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if (vm_is_unrestricted_guest(NULL)) {
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print_skip("Unrestricted guest must be disabled");
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exit(KSFT_SKIP);
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}
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warnings_before = get_warnings_count();
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for (int i = 0; i < NPROCESS; ++i) {
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int status;
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int pid = fork();
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if (pid < 0)
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exit(1);
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if (pid == 0) {
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test();
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exit(0);
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}
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while (waitpid(pid, &status, __WALL) != pid)
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;
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}
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warnings_after = get_warnings_count();
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TEST_ASSERT(warnings_before == warnings_after,
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"Warnings found in kernel. Run 'dmesg' to inspect them.");
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return 0;
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}
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