I hope this is a simple question.

I've installed OpenStack following the official guide for Juno. All the 6 nodes(Controller, compute, network object storage 1/2 and bloq storage) are Virtual Machines of the same server(its a quite powerfull server) virtualized with KVM.

Now, i want to use KVM on the compute node for the instances of openstack, is this possible?

I'm asking this because instances wont boot using KVM, but they will if I use QEMU.

Edit:

Aditional info:

Compute node(L1):

lsb_release -a (all the nodes)
    Distributor ID: Ubuntu
    Description:    Ubuntu 14.04.2 LTS
    Release:        14.04
    Codename:       trusty

lsmod | grep kvm_intel
kvm_intel             143590  0
kvm                   452088  1 kvm_intel


$ file /dev/kvm      
/dev/kvm: character special


$ cat /sys/module/kvm_intel/parameters/nested
Y

Host server(L0):

lsb_release -a

Distributor ID: Ubuntu
Description:    Ubuntu 14.04.2 LTS
Release:        14.04
Codename:       trusty

 $ cat /sys/module/kvm_intel/parameters/enable_shadow_vmcs
Y
$ cat /sys/module/kvm_intel/parameters/enable_apicv
Y
 $ cat /sys/module/kvm_intel/parameters/ept
Y

$ cat /sys/module/kvm_intel/parameters/nested
Y

This is what happens when i launch an instance with virt_type= KVM

Virsh capabilities of the compute node:

<capabilities>


<host>
    <uuid>b248b373-8334-1400-1101-692707f76d40</uuid>
    <cpu>
      <arch>x86_64</arch>
      <model>SandyBridge</model>
      <vendor>Intel</vendor>
      <topology sockets='12' cores='1' threads='1'/>
      <feature name='hypervisor'/>
      <feature name='osxsave'/>
      <feature name='vmx'/>
    </cpu>
    <power_management>
      <suspend_mem/>
      <suspend_disk/>
      <suspend_hybrid/>
    </power_management>
    <migration_features>
      <live/>
      <uri_transports>
        <uri_transport>tcp</uri_transport>
      </uri_transports>
    </migration_features>
    <topology>
      <cells num='1'>
        <cell id='0'>
          <memory unit='KiB'>30883820</memory>
          <cpus num='12'>
            <cpu id='0' socket_id='0' core_id='0' siblings='0'/>
            <cpu id='1' socket_id='1' core_id='0' siblings='1'/>
            <cpu id='2' socket_id='2' core_id='0' siblings='2'/>
            <cpu id='3' socket_id='3' core_id='0' siblings='3'/>
            <cpu id='4' socket_id='4' core_id='0' siblings='4'/>
            <cpu id='5' socket_id='5' core_id='0' siblings='5'/>
            <cpu id='6' socket_id='6' core_id='0' siblings='6'/>
            <cpu id='7' socket_id='7' core_id='0' siblings='7'/>
            <cpu id='8' socket_id='8' core_id='0' siblings='8'/>
            <cpu id='9' socket_id='9' core_id='0' siblings='9'/>
            <cpu id='10' socket_id='10' core_id='0' siblings='10'/>
            <cpu id='11' socket_id='11' core_id='0' siblings='11'/>
          </cpus>
        </cell>
      </cells>
    </topology>
    <secmodel>
      <model>apparmor</model>
      <doi>0</doi>
    </secmodel>
    <secmodel>
      <model>dac</model>
      <doi>0</doi>
      <baselabel type='kvm'>+108:+113</baselabel>
      <baselabel type='qemu'>+108:+113</baselabel>
    </secmodel>
  </host>

  <guest>
    <os_type>hvm</os_type>
    <arch name='alpha'>
      <wordsize>64</wordsize>
      <emulator>/usr/bin/qemu-system-alpha</emulator>
      <machine maxCpus='4'>clipper</machine>
      <domain type='qemu'>
      </domain>
    </arch>
    <features>
      <deviceboot/>
    </features>
  </guest>

  <guest>
    <os_type>hvm</os_type>
    <arch name='armv7l'>
      <wordsize>32</wordsize>
      <emulator>/usr/bin/qemu-system-arm</emulator>
      <machine maxCpus='1'>borzoi</machine>
      <machine maxCpus='4'>virt</machine>
      <machine maxCpus='4'>midway</machine>
      <machine maxCpus='1'>tosa</machine>
      <machine maxCpus='1'>cheetah</machine>
      <machine maxCpus='4'>vexpress-a15</machine>
      <machine maxCpus='1'>realview-pb-a8</machine>
      <machine maxCpus='1'>collie</machine>
      <machine maxCpus='1'>n800</machine>
      <machine maxCpus='4'>highbank</machine>
      <machine maxCpus='1'>kzm</machine>
      <machine maxCpus='1'>sx1-v1</machine ...