[Xen-API] [BUG] Xenserver 6.2 and XCP 1.6 ignore cap parameter for VPUs-params

[George Shuklin <george.shuklin@xxxxxxxxx>]

Good day.

Found bug in all 'xenops' versions (XCP 1.6, Xenserver 6.2).

Parameter 'cap' in  VCPUs-params is ignored. It mention in administrator 
guide for XenServer 6.2/6.1, and worked in earlier version (XCP 1.1), 
after upgrade it is ignored. Checked on fresh installation of Xenserver 
6.2 and upgraded one.
Cap can be changed manually via xc library for python but lasts only 
until migration.
Steps to reproduce:

Install vm

xe vm-set-param vm=... VPUs-params=cap:30
xe vm-shutdown vm=...
xe vm-start vm=...

run any cpu-intensive operation (f.e. cpuburn).

Expected: 30% CPU for domain at max
Actual: 100% or even more CPU


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