KVM: MMU: Rename PT64_ROOT_LEVEL to PT64_ROOT_4LEVEL.
Now we have 4 level page table and 5 level page table in 64 bits long mode, let's rename the PT64_ROOT_LEVEL to PT64_ROOT_4LEVEL, then we can use PT64_ROOT_5LEVEL for 5 level page table, it's helpful to make the code more clear. Also PT64_ROOT_MAX_LEVEL is defined as 4, so that we can just redefine it to 5 whenever a replacement is needed for 5 level paging. Signed-off-by: NYu Zhang <yu.c.zhang@linux.intel.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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