diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 8e62476e477b..a0d608e3fceb 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2512,6 +2512,12 @@ static void shadow_walk_init_using_root(struct kvm_shadow_walk_iterator *iterato
 
 	iterator->addr = addr;
 	iterator->shadow_addr = root;
+
+	if (WARN_ON_ONCE(!VALID_PAGE(root)) || kvm_mmu_is_dummy_root(root)) {
+		iterator->level = 0;
+		return;
+	}
+
 	iterator->level = vcpu->arch.mmu->root_role.level;
 
 	if (iterator->level >= PT64_ROOT_4LEVEL &&