KVM: selftests: Genericize upper level page table entry struct
In preparation for adding hugepage support, replace "pageMapL4Entry", "pageDirectoryPointerEntry", and "pageDirectoryEntry" with a common "pageUpperEntry", and add a helper to create an upper level entry. All upper level entries have the same layout, using unique structs provides minimal value and requires a non-trivial amount of code duplication. No functional change intended. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20210622200529.3650424-18-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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