Re: VMX ideas

Anthony Liguori
2008-10-29T15:46:01Z

Gerd Hoffmann wrote:
> Alexander Graf wrote:
>
>> So I was thinking hard on what to do to circumvent this problem and came
>> up with several approaches:
>>
>
>
>> 3. Create a root mode bloat framework
>>
>
> 4. Enter vmx root mode when the first user opens /dev/kvm and leave it
> when nobody uses it any more?
>
> Also note that there has been some discussion on lkml to move vmx-root
> on/off out of the kvm module into the kernel. There are a few places
> where it would be useful for the kernel to handle that without the kvm
> module being involved, crashdump kexec for example. With that and some
> locking in place (so only one can use vmx-root at a time) and
> hypervisors being friendly to each other and grab vmx-root only when
> they have a guest to run we should be set?
>

There was some patch that went into KVM that would indicate in CPU state
that VT root mode was enabled so that VMware could detect that someone
else was using VT. Look through the archives.

Regards,

Anthony Liguori

> cheers,
> Gerd
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