How To enable VT-x support in chromebook

enable vt-x in chromebook

Generously taken from this discussion; https://github.com/dnschneid/crouton/issues/675
They've created a wiki: https://github.com/dnschneid/crouton/wiki/Repack-kernel-to-Enable-VT_x-for-Virtualbox
You should check it out to see if anything has changed.

A. first of all install virtualbox correctly: https://gist.github.com/komuW/10991598. then;

1.Open a shell on your Chrome OS
ie while in in chromeOS; open browser, then ctrl+alt+T, then type shell, then press enter

2.Disable verified boot :
(You could do this later, but you have to do this before step 10. It won't boot up otherwise.)
$ sudo crossystem dev_boot_signed_only=0

3.Change current directory to Downloads as a temporary folder:
$ cd ~/Downloads/

4.Copy the existing kernel into a file:
$ sudo dd if=/dev/sda2 of=kernel2
$ sudo dd if=/dev/sda4 of=kernel4

5.Get the kernel configuration:
$ vbutil_kernel --verify kernel2 --verbose | tail -1 > vmxoff-config2.txt
$ vbutil_kernel --verify kernel4 --verbose | tail -1 > vmxoff-config4.txt

6.Add 'disablevmx=off' to the config line:
$ sed -i -e 's/$/ disablevmx=off/' vmxoff-config2.txt
$ sed -i -e 's/$/ disablevmx=off/' vmxoff-config4.txt

7.Repack the kernels:
$ vbutil_kernel --repack repacked2 --signprivate /usr/share/vboot/devkeys/kernel_data_key.vbprivk --keyblock /usr/share/vboot/devkeys/kernel.keyblock --oldblob kernel2 --config vmxoff-config2.txt 
#ie in one line

$ vbutil_kernel --repack repacked4 --signprivate /usr/share/vboot/devkeys/kernel_data_key.vbprivk --keyblock /usr/share/vboot/devkeys/kernel.keyblock --oldblob kernel4 --config vmxoff-config4.txt
#another one line

8.Verify the new kernels (You should see Body verification succeeded):
$ vbutil_kernel --verify repacked2 --verbose
$ vbutil_kernel --verify repacked4 --verbose

9.Copy the kernels back:
$ sudo dd if=repacked2 of=/dev/sda2
$ sudo dd if=repacked4 of=/dev/sda4

10.Reboot, and enjoy VT-x extensions
#NB: you should reboot the whole computer, ie the chromeOS.

This is great thanks, was curious if you know how to get the kvm modules into a chroot? I've been working at it for days with 0 luck

I met this problem
$ sudo dd if=/dev/sda2 of=kernel2
dd: failed to open '/dev/sda2': No such file or directory
then I checked this:
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 1.7G 1.2G 578M 67% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmp 1.9G 1.9G 2.2M 100% /tmp
run 1.9G 624K 1.9G 1% /run
shmfs 1.9G 22M 1.9G 2% /dev/shm
/dev/mmcblk0p1 11G 4.8G 5.1G 49% /mnt/stateful_partition
/dev/mmcblk0p8 12M 28K 12M 1% /usr/share/oem
/dev/mapper/encstateful 3.1G 123M 3.0G 4% /mnt/stateful_partition/encrypted
media 1.9G 0 1.9G 0% /media
tmpfs 128K 12K 116K 10% /run/crw
/dev/sdb1 228G 6.3G 210G 3% /media/removable/Sandisk 1
media 1.9G 0 1.9G 0% /media/removable/Sandisk 1/chroots/xenial/var/host/media
/dev/sdb1 228G 6.3G 210G 3% /media/removable/Sandisk 1/chroots/xenial/var/host/media/removable/Sandisk 1
I used crouton installed ubuntu in external USB storage.
There is no sda2/sda4, then I tried $ sudo dd if=/dev/root of=kernel, it didn't work.
Can you help me how to continue?

Hi there ~
I have ASUS Chromebook Flip C302ca. I can execute all the procedure without error. However, when I reboot the system and check if it turns VMX on by commands

$ sudo modprobe msr
$ sudo rdmsr 0x3A

It returns 1 (vmx is disabled).
But by cat /proc/cmdline, I can see disablevmx=off.

Do you know what is the problem?

ASUS Chromebook Flip C302CA:

I ran the steps, but now I cannot reboot. Chromebook kept looping in the "OS verification is turned OFF" screen. I had to press space to turn back on verification. Now I have this "chrome os is missing or damaged":

@mathieucarbou To get past the OS Verification is off screen either press CTRL+D or wait 30 seconds and you now need to recover from a USB Drive

I met this problem
$ sudo dd if=/dev/sda2 of=kernel2
dd: failed to open '/dev/sda2': No such file or directory
then I checked this:
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 1.7G 1.2G 578M 67% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmp 1.9G 1.9G 2.2M 100% /tmp
run 1.9G 624K 1.9G 1% /run
shmfs 1.9G 22M 1.9G 2% /dev/shm
/dev/mmcblk0p1 11G 4.8G 5.1G 49% /mnt/stateful_partition
/dev/mmcblk0p8 12M 28K 12M 1% /usr/share/oem
/dev/mapper/encstateful 3.1G 123M 3.0G 4% /mnt/stateful_partition/encrypted
media 1.9G 0 1.9G 0% /media
tmpfs 128K 12K 116K 10% /run/crw
/dev/sdb1 228G 6.3G 210G 3% /media/removable/Sandisk 1
media 1.9G 0 1.9G 0% /media/removable/Sandisk 1/chroots/xenial/var/host/media
/dev/sdb1 228G 6.3G 210G 3% /media/removable/Sandisk 1/chroots/xenial/var/host/media/removable/Sandisk 1
I used crouton installed ubuntu in external USB storage.
There is no sda2/sda4, then I tried $ sudo dd if=/dev/root of=kernel, it didn't work.
Can you help me how to continue?

I got the same problem.

I met this problem
$ sudo dd if=/dev/sda2 of=kernel2
dd: failed to open '/dev/sda2': No such file or directory
then I checked this:
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 1.7G 1.2G 578M 67% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmp 1.9G 1.9G 2.2M 100% /tmp
run 1.9G 624K 1.9G 1% /run
shmfs 1.9G 22M 1.9G 2% /dev/shm
/dev/mmcblk0p1 11G 4.8G 5.1G 49% /mnt/stateful_partition
/dev/mmcblk0p8 12M 28K 12M 1% /usr/share/oem
/dev/mapper/encstateful 3.1G 123M 3.0G 4% /mnt/stateful_partition/encrypted
media 1.9G 0 1.9G 0% /media
tmpfs 128K 12K 116K 10% /run/crw
/dev/sdb1 228G 6.3G 210G 3% /media/removable/Sandisk 1
media 1.9G 0 1.9G 0% /media/removable/Sandisk 1/chroots/xenial/var/host/media
/dev/sdb1 228G 6.3G 210G 3% /media/removable/Sandisk 1/chroots/xenial/var/host/media/removable/Sandisk 1
I used crouton installed ubuntu in external USB storage.
There is no sda2/sda4, then I tried $ sudo dd if=/dev/root of=kernel, it didn't work.
Can you help me how to continue?

I got the same problem.

there seems to be a theme here h

in the part of the dd commands they only work when I have a connected sd with ubuntu installed, but when it is not connected it says that kernel2 was not found, Very SUS

in the part of the dd commands they only work when I have a connected sd with ubuntu installed, but when it is not connected it says that kernel2 was not found, Very SUS

Could you please explain more detail on this step?

im Not Fucking Trying This if This is Damaging Chromebooks Hell Nah 0 Out of 10

@Zachat6
Try using "/dev/mmcblk*" instead of "/dev/sd*"
Use the df and fdisk command just in case

do recovery key combo and then do ctrl+d