106 lines
3.5 KiB
Java
106 lines
3.5 KiB
Java
/*
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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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package android.system.virtualmachine;
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import android.annotation.NonNull;
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import android.os.IBinder;
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import android.os.ParcelFileDescriptor;
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import android.system.virtualizationservice.IVirtualizationService;
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import com.android.internal.annotations.GuardedBy;
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import java.lang.ref.WeakReference;
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/** A running instance of virtmgr that is hosting a VirtualizationService AIDL service. */
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class VirtualizationService {
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static {
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System.loadLibrary("virtualizationservice_jni");
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}
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/* Soft reference caching the last created instance of this class. */
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@GuardedBy("VirtualMachineManager.sCreateLock")
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private static WeakReference<VirtualizationService> sInstance;
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/*
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* Client FD for UDS connection to virtmgr's RpcBinder server. Closing it
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* will make virtmgr shut down.
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*/
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private final ParcelFileDescriptor mClientFd;
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/* Persistent connection to IVirtualizationService. */
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private final IVirtualizationService mBinder;
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private static native int nativeSpawn();
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private native IBinder nativeConnect(int clientFd);
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private native boolean nativeIsOk(int clientFd);
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/*
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* Retrieve boolean value whether RELEASE_AVF_ENABLE_VENDOR_MODULES build flag is enabled or
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* not.
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*/
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static native boolean nativeIsVendorModulesFlagEnabled();
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/*
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* Spawns a new virtmgr subprocess that will host a VirtualizationService
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* AIDL service.
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*/
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private VirtualizationService() throws VirtualMachineException {
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int clientFd = nativeSpawn();
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if (clientFd < 0) {
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throw new VirtualMachineException("Could not spawn Virtualization Manager");
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}
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mClientFd = ParcelFileDescriptor.adoptFd(clientFd);
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IBinder binder = nativeConnect(mClientFd.getFd());
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if (binder == null) {
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throw new VirtualMachineException("Could not connect to Virtualization Manager");
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}
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mBinder = IVirtualizationService.Stub.asInterface(binder);
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}
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/* Returns the IVirtualizationService binder. */
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@NonNull
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IVirtualizationService getBinder() {
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return mBinder;
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}
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/*
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* Checks the state of the client FD. Returns false if the FD is in erroneous state
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* or if the other endpoint had closed its FD.
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*/
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private boolean isOk() {
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return nativeIsOk(mClientFd.getFd());
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}
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/*
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* Returns an instance of this class. Might spawn a new instance if one doesn't exist, or
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* if the previous instance had crashed.
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*/
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@GuardedBy("VirtualMachineManager.sCreateLock")
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@NonNull
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static VirtualizationService getInstance() throws VirtualMachineException {
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VirtualizationService service = (sInstance == null) ? null : sInstance.get();
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if (service == null || !service.isOk()) {
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service = new VirtualizationService();
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sInstance = new WeakReference<>(service);
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}
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return service;
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}
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}
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