[Bug 203543] Starting with kernel 5.1.0-rc6, kvm_intel can no longer be loaded in nested kvm/guests

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203543

--- Comment #4 from David Hill (hilld@binarystorm.net) ---
I didn't do anything fancy... only enabled nested kvm with:


[root@wolfe modprobe.d]# cat kvm.conf 
###
### This configuration file was provided by the qemu package.
### Feel free to update as needed.
###

###
### Set these options to enable nested virtualization
###

#options kvm_intel nested=1
#options kvm_amd nested=1
options kvm_intel nested=1

and exposed the flag in the libvirtd kvm definition.   Here is the hardware
description of the VM:

  <vcpu placement='static'>4</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-4.0'>hvm</type>
    <bootmenu enable='yes'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
    <vmport state='off'/>
  </features>
  <cpu mode='custom' match='exact' check='partial'>
    <model fallback='allow'>IvyBridge-IBRS</model>
    <feature policy='require' name='vmx'/>
  </cpu>
  <clock offset='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <pm>
    <suspend-to-mem enabled='no'/>
    <suspend-to-disk enabled='no'/>
  </pm>

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