Sander van Leeuwen wrote:
> 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.
>
>   

Simply '/sbin/rmmod kvm-intel' and kvm will exit vmx root mode.


-- 
Any sufficiently difficult bug is indistinguishable from a feature.


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