c439f780ee
gs101 builds are getting experimental support for pKVM which can be enabled either using fastboot or with misc_writer. For _pkvm builds we want the device to automatically enable pKVM for testing. This patch adds a new early-init service which checks for the presence of /dev/kvm and if not found, writes to /misc and forces a reboot. Bug: 192819132 Bug: 202484976 Test: flash a _pkvm build, observe double-reboot, check /dev/kvm exists Change-Id: I3834b3e4c6118b3f6e4093ce52d5b94117eca29c
75 lines
2 KiB
C
75 lines
2 KiB
C
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "pkvm_enabler"
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <log/log.h>
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#define KVM_DEVICE "/dev/kvm"
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#define MISC_WRITER "/vendor/bin/misc_writer"
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int main() {
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char *newargv[] = { MISC_WRITER, "--set-enable-pkvm", NULL };
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char *newenvp[] = { NULL };
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pid_t pid;
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int ret, wstatus;
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/* Check whether KVM device exists. */
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ret = access(KVM_DEVICE, F_OK);
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/* If KVM device exists, return SUCCESS to continue booting. */
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if (ret == 0) {
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exit(EXIT_SUCCESS);
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}
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if (ret != -ENOENT) {
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ALOGW("Unexpected error from access(): %d", ret);
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}
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/*
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* If KVM device does not exist, run misc_writer and return FAILURE
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* to force a reboot.
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*/
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pid = fork();
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if (pid == -1) {
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ALOGE("Could not fork: %d", errno);
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exit(EXIT_FAILURE);
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}
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if (pid == 0) {
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execve(MISC_WRITER, newargv, newenvp);
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ALOGE("Could not execute " MISC_WRITER ": %d", errno);
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_exit(EXIT_FAILURE);
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}
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waitpid(pid, &wstatus, 0);
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if (WIFEXITED(wstatus)) {
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ret = WEXITSTATUS(wstatus);
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if (ret) {
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ALOGE(MISC_WRITER " exit status: %d", ret);
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}
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} else {
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ALOGE(MISC_WRITER " terminated unexpectedly: %d", wstatus);
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}
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exit(EXIT_FAILURE);
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}
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