kvm permission denied on Android Studio emulator

Question

When I try to run an AVD, I get this erros:

/dev/kvm device permission denied

Yeah, I know, I don't have the permission to access /dev/kvm, I know that I can "solve" it by changing the /dev/kvm permission to my user, and set my user to kvm group, it is working but when I restart my user session, the /dev/kvm permission return to root user and root group, and I need to set the permission to my group again and again...

How to set this permission and prevent that when I reboot my computer my permission are not changed anymore?

SO: Ubuntu 18.04.01

yes, my user are on the kvm group and I already treid the 777 permission too... — felipe.rce, Oct 08 '18 at 01:55
Did you install all required dependencies as mentioned in official guide? https://developer.android.com/studio/run/emulator-acceleration#vm-linux and https://help.ubuntu.com/community/KVM/Installation — Andrei Vinogradov, Oct 08 '18 at 08:11
yes, the problems is: The folder permission and user/group are changin to root every time I logout/turn off my computer — felipe.rce, Oct 08 '18 at 20:57
Can you try this and tell if it works for you: sudo setfacl -m u:$USER:rwx /dev/kvm — Andrei Vinogradov, Oct 09 '18 at 08:10
That worked @AndreiVinogradov :) ... What does command do exactly? — roboli, Oct 12 '18 at 00:21
I posted this comment as answer with a little explanation. Please, accept it. ) — Andrei Vinogradov, Oct 12 '18 at 06:39

score 33 · Accepted Answer · answered Oct 12 '18 at 06:39

33

This command should help you:

sudo setfacl -m u:$USER:rwx /dev/kvm

Using it you will grant to current user rwx permissions to /dev/kvm. Or just replace $USER to any user you need.

As mentioned in setfacl manpages "This utility sets Access Control Lists (ACLs) of files and directories." It's a little bit different from chmod and chown. Using it you can grant required permissions to specific user. It's a bit more powerful tool and much more fine-grained. If you want to dive deeper, read about Access Control Lists. For example, in ubuntu docs: https://help.ubuntu.com/community/FilePermissionsACLs

answered Oct 12 '18 at 06:39

Andrei Vinogradov

1,865
15
32

1

it not worked, if I restart my computer, the permission return. – felipe.rce Oct 12 '18 at 07:23
2

Is package qemu-kvm installed? – Andrei Vinogradov Oct 12 '18 at 08:02
1

I see two options here. 1) Completely remove qemu-kvm using command "sudo apt autoremove qemu-kvm --purge" and then reinstall it. 2) Add command to set permissions on /dev/kvm to any boot-time script like .bashrc. – Andrei Vinogradov Oct 12 '18 at 13:12
ok, it worked if I put on .bashrc, I think it have other better things to fix that... But ok... – felipe.rce Oct 13 '18 at 18:06

score 2 · Answer 2 · answered Oct 24 '19 at 21:27

2

Had same problem, it worked when you restart the program.

sudo chmod 777 -R /dev/kvm

answered Oct 24 '19 at 21:27

Jamn Nemn

21
7

score 0 · Answer 3 · answered May 14 '20 at 19:17

0

Permissions for kernel virtual machine can be updated with the command sudo chmod 777 -R /dev/kvm in ubuntu system.

answered May 14 '20 at 19:17

code.rookie

346
2
6

score 0 · Answer 4 · answered Nov 23 '22 at 06:15

Update system BIOS Setting Assus

Power on the system and press[delete] key to enter BIOS [EZ Mode]
Press [F7] key to enter BIOS [Advance Mode] as below picture： (If press [delete] key to enter [Advanced Mode] directly and then no need to press [F7] key any more)
Select [Advanced] page and click [CPU Configuration] item
Select [Intel(VMX) Virtualization Technology] item and set to [Enabled]
Press [F10] key and click [OK] ,the system will auto reboot

score -1 · Answer 5 · answered Jun 22 '20 at 19:05

-1

The right permissions are:

sudo chmod 666 /dev/kvm

answered Jun 22 '20 at 19:05

user13794345

1

Please make sure to explain your solution and how it is different from the previous answers. Also if you're stating something (as a fact) you should usually include at least one source. – Leo Jun 22 '20 at 20:20

kvm permission denied on Android Studio emulator

5 Answers5