KVM22p1: Nested KVM

# In The Name Of Allah .
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# Thu Nov 19 14:20:52 2020
# Written By : zer0err0r .
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# 22, Nested VMs .
  
  # Lets check :
    $ cat /sys/module/kvm_intel/parameters/nested
    = [N, 0] means that its disabled, [Y, 1] means that its enabled .

  
  # Lets enable it :
    $ sudo vim /etc/modprobe.d/kvm-nested.conf
      options kvm-intel nested=1
      options kvm-intel enable_shadow_vmcs=1
      options kvm-intel enable_apicv=1
      options kvm-intel ept=1
    $ sudo modprobe -r kvm_intel    # Disabling the module .
    $ sudo modprobe -a kvm_intel    # Enabling the module again .

    # Notice :
      = 'Processors with extended page tables or support for shadow VMCS are not recommended by Red Hat for nested virtualization'
      = [VMCS] consist on virtual_machine_control_structure_shadowing .
      = extended_page_tables consist on [EPT] .
      = I dont know about [VMCS, EPT], But I think that you should care about them .

  
  # Then :
    = Edit the [.xml] of the VM that you will use as a nested hypervisor .
    = Make the [mode] value like the following ,
    $ virsh edit centos30
      <cpu mode="host-passthrough"/>


  # Finally :
    = Install your VM and configure it as a KVM hypervisor as we studied in this course .
    = We will do that in the next lesson ISA .




# BTWs :
  = Worked with me on intel_core_i5_3340M_2.7GHz_with_4GB_of_RAM_and_240kingstone_SSD .

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# Peace Be Up0n Muhammed .