KVM & VMX root mode

[Sander van Leeuwen <sandervl-2taLTamkYL2ELgA04lAiVw@public.gmane.org>]

Hi,

We have had several reports of users saying our product VirtualBox 
crashes their (Linux) host. It turned out that KVM is responsible, because
it leaves the CPU in VMX root mode.

Doing this changes the way the cpu operates: updates to reserved bits in 
control registers cause general protection faults.
We hit such cases on two occasions; clearing the X86_CR4_VMXE bit in CR4 
and turning off paging.

I have added a workaround to detect VMX root mode, simply refuse to run 
and recommend that the user disables KVM.
I would however appreciate if you could fix KVM instead.

-- 
Kind regards / mit freundlichen Gruessen / Met vriendelijke groet
  Sander van Leeuwen

innoTek GmbH
http://www.innotek.de
Germany 



-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >>  http://get.splunk.com/