ESXi 6 - CPUID advanced configuration option not taking effect

Hello,

ESXi version is 6. CPU is E-2650 v2.

In order to be able to use 1GB Huge Pages from within a CentOS 6.7 guest, I'm trying to configure ESXi to expose the 'pdpe1gb' CPU instruction.

To do that, I added these directives to the "advanced config" of the VM:

monitor_control.enable_fullcpuid = TRUE

featMask.vm.cpuid.pdpe1gb = "Val:1"

(I also added it to /etc/vmware/config of all hosts, just in case.)

I powered off-on the VM - and nothing happens - 'pdpe1gb' is still not there in /proc/cpuinfo.

What am I missing? Anything else that should be configured?

Thanks!