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While installing RHEV Hypervisor 3.3 on Oracle VirtualBox I am getting following message:

Failed to open a session for the virtual machine RhevH1
VT-x is used by another hypervisor.
(VERR_VMX__IN_VMX_ROOT_MODE).
VirtualBox Can't operate in VMX root mode. Please disable the KVM
kernel extension, recompile your kernel and reboot
(VERR_VMX_IN_VMX_ROOT_MODE).

What are the possible solutions are there for this?

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    This is basically the same question as <unix.stackexchange.com/questions/136167/…>. You can't run VMs on VMs. That's what the error about VT-x is telling you :) – mirimir Jun 9 '14 at 9:13
  • No both are different on is for Virtual Machine Manager and another is for Oracle VM Box. – user3134198 Jun 9 '14 at 9:18
  • OK, they're not identical. But I guarantee that you'll get more or less the same error trying to run RHEV on any sort of VM. – mirimir Jun 9 '14 at 9:22
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VirtualBox does not support running any kind of native virtualization software inside it (VirtualBox itself, KVM/RHEV, Hyper-V, ESX, Xen in full virtualization mode, …).

Run RHEV directly on the hardware.

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RHEV hypervisor can run nested under kvm or vmware, but vbox doesn't support nesting, and willnot expose virtual functions inside the VM. Nothing to do with RHEV, this is a vbox limitation.

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