Shadow page tables are used by the hypervisor to keep track of the state in which the guest “thinks” its page tables should be. The guest can’t be allowed access to the hardware page tables because then it would essentially have control of the machine. So, the hypervisor keeps the “real” mappings (guest virtual -> … Read more
Yes every process has its own pagetables. They might be shared with the parent process(copy on write) or with other processes(shared memory). But in general every process has its own.
In singlelevel pagetable you need the whole table to access even a small amount of data(less memory references). i.e 2^20 pages each PTE occupying 4bytes as you assumed. Space required to access any data is 2^20 * 4bytes = 4MB Paging pages is multi-level paging.In multilevel paging it is more specific, you can with the … Read more