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Re: [Xen-users] Nested Virtualisation question

  • To: Jeroen Groenewegen van der Weyden <groen692@xxxxxxxxx>
  • From: Todd Deshane <todd.deshane@xxxxxxx>
  • Date: Tue, 15 Feb 2011 15:21:19 +0000
  • Cc: Outback Dingo <outbackdingo@xxxxxxxxx>, "xen-users-request@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Tue, 15 Feb 2011 07:22:45 -0800
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On Tue, Feb 15, 2011 at 6:47 AM, Jeroen Groenewegen van der Weyden
<groen692@xxxxxxxxx> wrote:
> The why is a good question,
> We use xen as out main virtualisation platform. But now there are
> applications that use virtualisation it self. In my case I have an
> application that uses kvm. So to put it on our xen server it needs to be
> nested. I guess in the future more of these situation will appear.
> I read somethings about nested virtualisation and I wonder If somebody has
> any experience with it.

To run KVM inside of a guest you need virtualization support within
the guest (running nested xen doesn't require the double nested
(unless you want to do HVM within the nested of course))

Patches can be found here:

I believe KVM should also have support for nested vmx and nested svm.

The use cases are fairly slim, so finding users/testers is often difficult.

Please report any bugs you find to the appropriate devel lists and cc
the appropriate nested virtualization maintainers .

Hope that helps.


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