1. A computer-implemented method, comprising: receiving, by a virtual machine monitor (VMM) of a host virtual machine (VM) server device, a memory management unit (MMU) synchronization event issued from a VM virtualized by the VMM of the host server device; and synchronizing, by the VMM, one or more unsynchronized page tables (PTs) of a shadow PT hierarchy maintained by the VMM with one or more corresponding guest PTs of a guest PT hierarchy maintained by the VM, wherein the one or more unsynchronized PTs include an unlimited number of unsynchronized PTs in a visible address space of the shadow PT hierarchy that is determined by a current CR3 register address of the shadow PT hierarchy.