Android Studio 2.3 使用控制台中的模拟器，root 用户的“/dev/kvm 设备：权限被拒绝”

Posted 2023-02-19

【中文标题】Android Studio 2.3 使用控制台中的模拟器，root 用户的“/dev/kvm 设备：权限被拒绝”

【英文标题】：Android Studio 2.3 using emulator from console, "/dev/kvm device: permission denied" for root user

【发布时间】：2017-08-06 11:22:32

【问题描述】：

我正在尝试启动我使用 Android Studio 2.3 的 avdmanager 创建的虚拟 android 设备（通过命令行）

所有命令都以 root 用户

身份执行

当我尝试通过$ ~/Android/Sdk/tools/./emulator @Nexus_5X_Api_23_x86 启动模拟器时，输出为：

emulator: ERROR: x86_64 emulation currently requires hardware acceleration!
Please ensure KVM is properly installed and usable.
CPU acceleration status: This user doesn't have permissions to use KVM (/dev/kvm)

我使用的是 64 位的 Ubuntu 16.04 服务器，Android Studio 是通过 x11 转发启动的，因此使用了我的桌面环境（也是 ubuntu 16.04，64 位！）

当我输入 $ kvm-ok 时，它给了我：

INFO: /dev/kvm exists
KVM acceleration can be used

为了证明我尝试访问的 .avd 存在：

$ ~/Android/Sdk/tools/bin/./avdmanager list avd

给出输出：

März 15, 2017 4:30:53 NACHM. sun.util.PropertyResourceBundleCharset$PropertiesFileDecoder decodeLoop
INFO: Invalid or unmappable UTF-8 sequence detected. Switching encoding from UTF-8 to ISO-8859-1
Available Android Virtual Devices:
    Name: Nexus_5X_Api_23_x86
  Device: Nexus 5X (Google)
    Path: /root/.android/avd/Nexus_5X_Api_23_x86.avd
  Target: Google APIs (Google Inc.)
          Based on: Android 6.0 (Marshmallow) Tag/ABI: google_apis/x86_64
  Sdcard: 800M

/dev/kvm 的进一步权限是：

root@h2627852:~# ls -l /dev/kvm
crwxrwxrwx 1 root kvm 10, 232 Mär 15 10:48 /dev/kvm
root@h2627852:~# groups root
root : root kvm libvirtd libvirt

执行emulator-check 给了我：

root@h2627852:~# ~/Android/Sdk/tools/./emulator-check accel hyper-v cpu-info window-mgr desktop-env
accel:
11
This user doesn't have permissions to use KVM (/dev/kvm)
accel
hyper-v:
0
Hyper-V runs only on Windows
hyper-v
cpu-info:
146
Intel CPU|Virtualization is supported|64-bit CPU|
cpu-info
debug1: client_input_channel_open: ctype x11 rchan 3 win 65536 max 16384
debug1: client_request_x11: request from ::1 36346
debug1: channel 1: new [x11]
debug1: confirm x11
debug1: channel 1: FORCE input drain
window-mgr:
0
GNOME Shell
window-mgr
desktop-env:
0
mate
desktop-env

我真的不知道该怎么办了，搜索了整个论坛，但没有为我的系统找到此问题的复制品，其他系统上相同问题的修复对我不起作用，已经尝试完全清除并重新安装所有 qemu、libvirt、libvirtd 和 kvm 软件包，但没有成功。

感谢任何帮助！

编辑：~/Android/Sdk/tools/./emulator @Nexus_5X_Api_23_x86 -verbose 给我，

以下输出：

emulator:Android emulator version 25.3.0.0 (build_id 3394391)
emulator:Found AVD name 'Nexus_5X_Api_23_x86'
emulator:Found AVD target architecture: x86_64
emulator:argv[0]: '/root/Android/Sdk/tools/./emulator'; program directory: '/root/Android/Sdk/tools'
emulator:  Found directory: /root/Android/Sdk/system-images/android-23/google_apis/x86_64/

emulator:Probing for /root/Android/Sdk/system-images/android-23/google_apis/x86_64//kernel-ranchu: file exists
emulator:Auto-config: -engine qemu2 (based on configuration)
emulator:  Found directory: /root/Android/Sdk/system-images/android-23/google_apis/x86_64/

emulator:try dir /root/Android/Sdk/tools
emulator:try dir /root/Android/Sdk/tools/./
emulator:try dir /root/Android/Sdk/emulator
emulator:Found target-specific 64-bit emulator binary: /root/Android/Sdk/emulator/qemu/linux-x86_64/qemu-system-x86_64
emulator:Adding library search path: '/root/Android/Sdk/emulator/lib64'
emulator:Adding library search path: '/root/Android/Sdk/emulator/lib64/libstdc++'
emulator:  Found directory: /root/Android/Sdk/system-images/android-23/google_apis/x86_64/

emulator:  Found directory: /root/Android/Sdk/system-images/android-23/google_apis/x86_64/

emulator:GPU emulation is disabled
emulator: Adding library search path for Qt: '/root/Android/Sdk/emulator/lib64/qt/lib'
emulator: Setting Qt plugin search path: QT_QPA_PLATFORM_PLUGIN_PATH=/root/Android/Sdk/emulator/lib64/qt/plugins
emulator: Running :/root/Android/Sdk/emulator/qemu/linux-x86_64/qemu-system-x86_64
emulator: qemu backend: argv[00] = "/root/Android/Sdk/emulator/qemu/linux-x86_64/qemu-system-x86_64"
emulator: qemu backend: argv[01] = "@Nexus_5X_Api_23_x86"
emulator: qemu backend: argv[02] = "-verbose"
emulator: Concatenated backend parameters:
 /root/Android/Sdk/emulator/qemu/linux-x86_64/qemu-system-x86_64 @Nexus_5X_Api_23_x86 -verbose
emulator: Android virtual device file at: /root/.android/avd/Nexus_5X_Api_23_x86.ini
emulator: virtual device content at /root/.android/avd/Nexus_5X_Api_23_x86.avd
emulator: virtual device config file: /root/.android/avd/Nexus_5X_Api_23_x86.avd/config.ini
emulator: using core hw config path: /root/.android/avd/Nexus_5X_Api_23_x86.avd/hardware-qemu.ini
emulator: Found AVD target API level: 23
emulator: Read property file at /root/Android/Sdk/system-images/android-23/google_apis/x86_64//build.prop
emulator: No boot.prop property file found.
emulator: Warning: config.ini contains invalid skin.path entry: (null)
emulator: autoconfig: -skin HVGA
emulator: autoconfig: -skindir (null)
emulator: autoconfig: -kernel /root/Android/Sdk/system-images/android-23/google_apis/x86_64//kernel-ranchu
emulator: Target arch = 'x86_64'
emulator: Auto-detect: Kernel image requires new device naming scheme.
emulator: Auto-detect: Kernel does not support YAFFS2 partitions.
emulator: autoconfig: -ramdisk /root/Android/Sdk/system-images/android-23/google_apis/x86_64//ramdisk.img
emulator: Using initial system image: /root/Android/Sdk/system-images/android-23/google_apis/x86_64//system.img
emulator: autoconfig: -data /root/.android/avd/Nexus_5X_Api_23_x86.avd/userdata-qemu.img
emulator: autoconfig: -initdata /root/.android/avd/Nexus_5X_Api_23_x86.avd/userdata.img
emulator: autoconfig: -cache /root/.android/avd/Nexus_5X_Api_23_x86.avd/cache.img
emulator: autoconfig: -sdcard /root/.android/avd/Nexus_5X_Api_23_x86.avd/sdcard.img
emulator: Increasing RAM size to 1024MB
emulator: VM heap size 0MB is below hardware specified minimum of 256MB,setting it to that value
emulator: System image is read only
emulator: GPU emulation is disabled
emulator: Found 2 DNS servers: 85.214.7.22 81.169.163.106
emulator: skin name 'HVGA' aliased to '320x480'
emulator: found magic skin width=320 height=480 bpp=16

emulator: CPU Acceleration: DISABLED
emulator: CPU Acceleration status: This user doesn't have permissions to use KVM (/dev/kvm)
emulator: ERROR: x86_64 emulation currently requires hardware acceleration!
Please ensure KVM is properly installed and usable.
CPU acceleration status: This user doesn't have permissions to use KVM (/dev/kvm)

【问题讨论】：

不要使用工具/模拟器改用`$ANDROID_HOME/emulator/emulator`

问题依旧，因为'$ANDROID_HOME/emulator/emulator' 只是符号链接到'$ANDROID_HOME/tools/emulator' 因为Android Studio 2.3

Android Studio: /dev/kvm device permission denied的可能重复

【参考方案1】：

试试这个。 这对我有用

$ sudo chown username -R /dev/kvm

有时您还需要运行此代码

$ cd Android/Sdk/emulator/lib64/libstdc++
$ mv libstdc++.so.6 libstdc++.so.6.bak
$ ln -s /usr/lib64/libstdc++.so.6

【讨论】：

每次我尝试打开模拟器时都必须这样做吗？这是应该的吗？没有一次性解决方法吗？

【参考方案2】：

试试这些步骤：

如下安装qemu-kvm

sudo apt install qemu-kvm

使用以下命令将用户添加到 kvm 组：

sudo adduser <username> kvm

如果您得到权限被拒绝，请尝试以下命令

sudo chown <username> /dev/kvm

它在 Ubuntu 18.04

中对我有用

【讨论】：

每次我尝试打开模拟器时都必须这样做吗？这是应该的吗？没有一次性解决方法吗？

这可行，但不是解决方案。一旦我们想再次打开模拟器，错误就会再次出现。

@SherinBinu 你找到一次性修复了吗？

【参考方案3】：

假设您要使用当前操作系统用户应用此所有权更改，请使用以下命令：

sudo chown $(whoami) -R /dev/kvm

【讨论】：

chown: invalid user: 'whoami' -- 所以我把它包装成这样：$(whoami)

【参考方案4】：

我解决了运行问题

sudo apt install qemu-kvm
sudo chown username -R /dev/kvm

【参考方案5】：

检查nano /etc/group 包含以kvm 开头并以您的用户名结尾的行。如果没有，则运行：

sudo gpasswd -a $USER kvm