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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Also affects: nova/newton
   Importance: Undecided
       Status: New

** Changed in: nova/newton
       Status: New => In Progress

** Changed in: nova/newton
     Assignee: (unassigned) => Lee Yarwood (lyarwood)

** Changed in: nova/newton
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1614054

Title:
  Incorrect host cpu is given to emulator threads when cpu_realtime_mask
  flag is set

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) newton series:
  In Progress

Bug description:
  Description of problem:
  When using the cpu_realtime and cpu_realtim_mask flag to create new instance, the 'cpuset' of 'emulatorpin' option is using the id of vcpu which is incorrect. The id of host cpu should be used here.

  e.g.
    <cputune>
      <vcpupin vcpu='0' cpuset='2'/>
      <vcpupin vcpu='1' cpuset='3'/>
      <emulatorpin cpuset='0'/>          ### the cpuset should be '2' here, when cpu_realtime_mask=^0.  
      <vcpusched vcpus='1' scheduler='fifo' priority='1'/>
    </cputune>

  How reproducible:
  Boot new instance with cpu_realtime_mask flavor.

  Steps to Reproduce:
  1. Create RT flavor
  nova flavor-create m1.small.performance 6 2048 20 2
  nova flavor-key m1.small.performance set hw:cpu_realtime=yes
  nova flavor-key m1.small.performance set hw:cpu_realtime_mask=^0
  nova flavor-key m1.small.performance set hw:cpu_policy=dedicated
  2. Boot a instance with this flavor
  3. Check the xml of the new instance

  Actual results:
    <cputune>
      <vcpupin vcpu='0' cpuset='2'/>
      <vcpupin vcpu='1' cpuset='3'/>
      <emulatorpin cpuset='0'/>          
      <vcpusched vcpus='1' scheduler='fifo' priority='1'/>
    </cputune>

  Expected results:
    <cputune>
      <vcpupin vcpu='0' cpuset='2'/>
      <vcpupin vcpu='1' cpuset='3'/>
      <emulatorpin cpuset='2'/>          
      <vcpusched vcpus='1' scheduler='fifo' priority='1'/>
    </cputune>

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