KVM: MMU: check kvm_mmu_pages and mmu_page_path indices
Give a special invalid index to the root of the walk, so that we can check the consistency of kvm_mmu_pages and mmu_page_path. Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> [Extracted from a bigger patch proposed by Guangrong. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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