!7104 KVM: Always flush async #PF workqueue when vCPU is being destroyed

Merge Pull Request from: @ci-robot 
 
PR sync from: Wei Li <liwei391@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/UXCZ3ZBYXR3JPFNRPV64SSUQT32OWJN2/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9L4ZX 
 
Link:https://gitee.com/openeuler/kernel/pulls/7104

 

Reviewed-by: Kevin Zhu <zhukeqian1@huawei.com>
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Reviewed-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>