!4261 [22.03-LTS-SP3] Fix crash on platfoms using legacy KVM MMU Notifier APIs

Merge Pull Request from: @yuzhang_intel 
 
Title: Fix crash on platfoms using legacy KVM MMU Notifier APIs

Content:
This PR is to fix a bug in KVM MMU. The bug can cause a kernel panic, if the host is still using old KVM MMU notifier APIs (e.g., on LoongArch). 

Issue is reported by https://gitee.com/openeuler/kernel/issues/I8YDCS. 
 
Link:https://gitee.com/openeuler/kernel/pulls/4261

 

Reviewed-by: Aichun Shi <aichun.shi@intel.com>
Reviewed-by: Jason Zeng <jason.zeng@intel.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>