mmu_free_root_page
mmu_free_root_page(kvm, &mmu->prev_roots[i].hpa,
mmu_free_root_page(kvm, &mmu->root.hpa, &invalid_list);
mmu_free_root_page(kvm, &mmu->pae_root[i],
mmu_free_root_page(vcpu->kvm, &vcpu->arch.mmu->mirror_root_hpa,