Bug 1318697

Description of problem:
We have been using nested virtualization to test RHEV deployments. Typically we have a Fedora 23 host with nested virtualization enabled, which runs a hypervisor and engine. In turn we'll launch vm's in the RHEV environment (typically CFME at this time)

A new feature in 4.4 is:
"KVM: Nested virtualization now supports VPID (same as PCID but for vCPUs) which makes it quite a bit faster"

With 4.4 I see the vpid feature when I cat /proc/cpuinfo on RHEV hypervisors installed. When booting 4.3 I do not see this feature in the guests. On 4.4 kernels we are unable to boot VM's under RHEV. VM's get in a bad state when trying to launch them and the hypervisor starts complaining about cpu soft lockups.

If I add a modeprobe.d file with 'options kvm_intel vpid=0' and unload and load the module before attempting to launch a vm it runs fine. 

Version-Release number of selected component (if applicable):
kernel-4.4.4-301.fc23.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Install RHEV on a Fedora 23 host with nested kvm enabled
2. Try to boot a vm on the new rhev cluster

Actual results:
VM hangs trying to start. You'll probably see cpu soft lockups on the hypervisor after awhile

Expected results:
VM boots

Additional info:
Going back to 4.3 kernels seems to work, as does adding a modprobe.d file to disable vpid within the kvm-intel module.