A VMware research paper found that RVI offers up to 42 % gains in performance compared with software-only ( shadow page table ) implementation.
2.
Some of the above hypervisors actually require EPT in order to work at all ( not just faster ) as they do not implement a software shadow page table; the list is not fully updated to reflect that.
3.
When the guest was an operating system that itself implemented virtual memory, even non-privileged instructions could experience longer execution times-a penalty imposed by the requirement to access translation tables not used in native execution ( see shadow page tables ).
4.
Modern processors use the concepts of physical memory and virtual memory; running processes use virtual addresses and when an instruction requests access to memory, the processor translates the virtual address to a physical address using a page table or shadow page table ), and once inside the host system ( using hardware page table ).