Re: KVM & Xen coexist?

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Jun Koi wrote:
> hi,
>
> i guess this question should be in your FAQ: does KVM work with Xen?
> in the other word, is it possible to run KVM on Xen machine? (i.e
> loading KVM on Dom0 or DomU. obviously it does not work on DomU, but i
> am not sure about Dom0 case).
>   

Theoretically, you can run Xen for paravirtualization and kvm for full 
virtualization.  Realistically, that's not trivial to accomplish:

- Xen adds an additional addressing abstraction (machine addresses) that 
kvm has to be taught about
- kvm uses privileged instructions which cannot be executed by a Xen 
guest (and would thus need assists)
- VT returns to ring 0, and would need an assist to return to ring 1 
where Linux (and kvm) lives
- kvm wants to be pinned to a cpu while it's modifying VT state

Another option is to use a small subset of kvm to run paravirtualized 
Xen guests on top of kvm (without Xen itself).

-- 
error compiling committee.c: too many arguments to function


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