Pci resource management

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a) Same PCI had different Objects, one in the stats and another in the instance b) when RESIZE secondary host get other instances Objects

Resize:

  -> new host claim  -> old host stop (instance going to new HOST)->  new host starting new instance

Confirm:

   new machine call source machines’s  drop_resize_claim ( a new resource tracker been setting up)

Aborting:

   new:  stop new instance, drop claim -- >  old: reverting old status and stating machine

_{problem 1: 在使用hostname前, claim状态必须保存, 因为libvirt 比较instance内的hostname和 pci device内的 compute ID 解决方法A: 从instance 的hostname 得到 compute node,然后得到 compute node ID 风险: 总是要读取数据库,并无法缓存 方法2: 保留 "Claim" 状态}